United States Office of Water EPA 821-R-99-001 Environmental Protection 4303 April 1999 Agency



# TECHNICAL DEVELOPMENT DOCUMENT 

# PHASE I UNIFORM NATIONAL DISCHARGE STANDARDS FOR VESSELS OF THE ARMED FORCES

# Technical Development Document

for
Phase I Uniform National Discharge Standards

for

Vessels of the Armed Forces

Naval Sea Systems Command U.S. Department of the Navy Arlington, VA 22202

and
Engineering and Analysis Division Office of Science and Technology Office of Water U.S. Environmental Protection Agency Washington, DC 20460

April, 1999

### FOREWORD

This Technical Development Document was produced jointly by the Naval Sea Systems Command of the United States Navy and the Office of Water of the United States Environmental Protection Agency. The purpose of this document is to provide, in part, the technical background that was used to develop the Phase I regulation that is issued under authority of the Uniform National Discharge Standards provisions of the Clean Water Act, 33 U.S.C., 1322(n).i 

### TABLE OF CONTENTS

EXECUTIVE SUMMARY

................................ ................................ ......................... ES-1

CHAPTER 1. BACKGROUND OF THE UNIFORM NATIONAL DISCHARGE STANDARDS 1.1 Background

................................ ................................ ................................ ............... 1-1 1.2 Legal Authority and Statutory Requirements for the UNDS Regulations

................ 1-2 1.2.1 Discharges

................................ ................................ ................................ .. 1-2 1.2.2 Vessels

................................ ................................ ................................ ....... 1-2 1.2.3 Waters

................................ ................................ ................................ ........ 1-3 1.3 UNDS Development Requirements

................................ ................................ .......... 1-3 1.4 References

................................ ................................ ................................ ................. 1-5

CHAPTER 2. VESSELS OF THE ARMED FORCES 2.1 Introduction

................................ ................................ ................................ ............... 2-1 2.2 Description of Vessel Classes and Types

................................ ................................ .. 2-2 2.2.1 Vessels of the U.S. Navy

................................ ................................ ........... 2-2 2.2.1.1 Navy Mission

................................ ................................ ................ 2-2 2.2.1.2 Navy Vessel Description

................................ .............................. 2-2 2.2.2 Vessels of the Military Sealift Command

................................ .................. 2-5 2.2.2.1 Military Sealift Command Mission

................................ .............. 2-5 2.2.2.2 Speci al Mission Support Force

................................ ..................... 2-6 2.2.2.3 Naval Fleet Auxiliary Force

................................ ......................... 2-6 2.2.3 Vessels of the U.S. Coast Guard

................................ ................................ 2-7 2.2.3.1 Coast Guard Mission

................................ ................................ .... 2-7 2.2.3.2 Coast Guard Vessel Description

................................ ................... 2-7 2.2.4 Vessels of the U.S. Army

................................ ................................ ......... 2-10 2.2.4.1 Army Mission

................................ ................................ ............. 2 -10 2.2.4.2 Army Vessel Description

................................ ............................ 2-10 2.2.5 Vessels of the U.S. Marine Corps

................................ ............................ 2-12 2.2.5.1 Marine Corps Mission

................................ ................................ 2-12 2.2.5.2 Marine Corps Vessel Description

................................ ............... 2-12 2.2.6 Vessels of the U.S. Air Force

................................ ................................ ... 2-12 2.2.6.1 Air Force Mission

................................ ................................ ....... 2-12 2.2.6.2 Air Force Vessel Description

................................ ..................... 2-12 2.2.7 Vessels Not Covered by UNDS

................................ ............................... 2-13 2.2.7.1 Army Corps of Engineers Vessels

................................ .............. 2-13 2.2.7.2 Maritime Administration Vessels

................................ ............... 2-13 2.2.7.3 Vessels Preserved as Memorials and Museums

......................... 2-14 2.2.7.4 Time- and Voyage- Chartered Vessels

................................ ........ 2-14 2.2.7.5 Vessels Under Construction

................................ ....................... 2-14 2.2.7.6 Vessels in Drydock

................................ ................................ ..... 2-14 2.2.7.7 Amphibious Vehicles

................................ ................................ . 2-14ii



### 2.3 Locations of Armed Forces Vessels

................................ ................................ ........ 2-15 2.3.1 Homeports

................................ ................................ ................................ 2-15 2.3.1.1 Navy Ports

................................ ................................ .................. 2-15 2.3.1.2 Coast Guard Ports

................................ ................................ ....... 2-15 2.3.1.3 Army Ports

................................ ................................ .................. 2-15 2.3.1.4 Military Sealift Command, Marine Corps, and Air Force Port Usage

................................ ................................ ................ 2-16 2.3.2 Operation within Navigable Waters of the U.S. and the Contiguous Zone

................................ ................................ ................................ ..... 2-16 2.4 References

................................ ................................ ................................ ............... 2-20

CHAPTER 3. DATA COLLECTION 3.1 Introduction

................................ ................................ ................................ ............... 3-1 3.2 Surveys

................................ ................................ ................................ ...................... 3-1 3.3 Consultations with Department of Defense Personnel Having Equipment Expertise

................................ ................................ ................................ .............. 3-2 3.4 Consultation and Outreach Outside the Department of Defense

.............................. 3-3 3.4.1 Initial State Consultation Meetings

................................ ............................ 3-4 3.4.2 Second Round of State Consultation Meetings

................................ ......... 3-4 3.4.3 Consultation with Environmental Organizations

................................ ....... 3-5 3.4.4 UNDS Newsletter and Homepage

................................ ............................. 3-5 3.5 Sampling and Analysis

................................ ................................ .............................. 3-6 3.5.1 Approach to Identifying Discharges Requiring Sampling

......................... 3-6 3.5.2 Approach to Determining Analytes

................................ ........................... 3-6 3.5.3 Shipboard Sampling

................................ ................................ ................... 3-7 3.5.4 Quality Assurance/Quality Control and Data Validation Procedures

........ 3-8 3.6 References

................................ ................................ ................................ ............... 3-10

CHAPTER 4. DISCHARGE EVALUATION METHODOLOGY 4.1 Introduction

................................ ................................ ................................ ............... 4-1 4.2 Environmental Effects Determination

................................ ................................ ...... 4-1 4.2.1 Chemical Constituents

................................ ................................ ............... 4-1 4.2.2 Thermal Pollution

................................ ................................ ...................... 4-5 4.2.3 Bioaccumulative Chemicals of Concern

................................ .................... 4-6 4.2.4 Nonindigenous Species

................................ ................................ .............. 4-7 4.2.5 Discharge Evaluation

................................ ................................ ................. 4-7 4.3 Nature of Discharge Analysis

................................ ................................ ................... 4-8 4.3.1 Nature of Discharge Report Contents

................................ ........................ 4-9 4.3.2 Peer Review

................................ ................................ ............................. 4-10 4.4 MPCD Practicability, Operational Feasibility, and Cost Analysis

......................... 4-11 4.4.1 MPCD Practicability, Operational Feasibility, and Cost Report Contents

................................ ................................ ................................ . 4-11 4.5 References

................................ ................................ ................................ ............... 4-12iii



### CHAPTER 5. PHASE I DISCHARGE DETERMINATIONS 5.1 Discharges Determined To Require MPCDs

................................ ............................ 5-1 5.1.1 Aqueous Film-Forming Foam

................................ ................................ .. 5-3 5.1.2 Catapult Water Brake Tank and Post-Launch Retraction Exhaust

.......... 5-4 5.1.3 Chain Locker Effluent

................................ ................................ .............. 5-5 5.1.4 Clean Ballast

................................ ................................ ........................... 5-6 5.1.5 Compensated Fuel Ballast

................................ ................................ ........ 5-7 5.1.6 Controllable Pitch Propeller Hydraulic Fluid

................................ .......... 5-8 5.1.7 Deck Runoff

................................ ................................ ............................. 5-9 5.1.8 Dirty Ballast

................................ ................................ ........................... 5-10 5.1.9 Distillation and Reverse Osmosis Brine

................................ ................ 5-11 5.1.10 Elevator Pit Effluent

................................ ................................ .............. 5-12 5.1.11 Firemain Systems

................................ ................................ ................... 5-13 5.1.12 Gas Turbine Water Wash

................................ ................................ ...... 5-14 5.1.13 Graywater

................................ ................................ .............................. 5-14 5.1.14 Hull Coating Leachate

................................ ................................ ........... 5-15 5.1.15 Motor Gasoline Compensating Discharge

................................ ............. 5-16 5.1.16 Non-Oily Machinery Wastewater

................................ .......................... 5-17 5.1.17 Photographic Laboratory Drains

................................ ............................ 5-17 5.1.18 Seawater Cooling Overboard Discharge

................................ ................ 5-18 5.1.19 Seawater Piping Biofouling Prevention

................................ ................. 5-19 5.1.20 Small Boat Engine Wet Exhaust

................................ ............................ 5-20 5.1.21 Sonar Dome Discharge

................................ ................................ .......... 5-20 5.1.22 Submarine Bilgewater

................................ ................................ ............ 5-21 5.1.23 Surface Vessel Bilgewater/Oil-Water Separator Discharge

................... 5-22 5.1.24 Underwater Ship Husbandry

................................ ................................ .. 5-22 5.1.25 Welldeck Discharges

................................ ................................ .............. 5-23 5.2 Discharges Determined To Not Require MPCDs

................................ ................... 5-25 5.2.1 Boiler Blowdown

................................ ................................ ................... 5-25 5.2.2 Catapult Wet Accumulator Discharge

................................ ................... 5-27 5.2.3 Cathodic Protection

................................ ................................ ................ 5-28 5.2.4 Freshwater Lay-Up

................................ ................................ ................. 5-29 5.2.5 Mine Countermeasures Equipment Lubrication

................................ .... 5-30 5.2.6 Portable Damage Control Drain Pump Discharge

................................ . 5-31 5.2.7 Portable Damage Control Drain Pump Wet Exhaust

............................. 5-32 5.2.8 Refrigeration /Air Conditioning Condensate

................................ ......... 5-33 5.2.9 Rudder Bearing Lubrication

................................ ................................ ... 5-33 5.2.10 Steam Condensate

................................ ................................ .................. 5-34 5.2.11 Stern Tube Seals and Underwater Bearing Lubrication

......................... 5-35 5.2.12 Submarine Acoustic Countermeasures Launcher Discharge

................. 5-36 5.2.13 Submarine Emergency Diesel Engine Wet Exhaust

.............................. 5-37 5.2.14 Submarine Outboard Equipment Grease and External Hydraulics

........ 5-38 5.3 References

................................ ................................ ................................ ............... 5-39

GLOSSARY AND ABBREVIATIONS

................................ ................................ .... GL-1iv 

### LIST OF TABLES
Table ES-1 Discharges Determined To Require MPCDs

................................ ............ ES-2 Table ES-2 Discharges Determined To Not Require MPCDs

................................ ..... ES-4
Table 2-1 Armed Forces Vessels Subject to UNDS Regulations

................................ 2-1 Table 2-2 Navy Vessel Classification

................................ ................................ .......... 2-4 Table 2-3 Military Sealift Command Vessel Classification

................................ ........ 2-7 Table 2-4 Coast Guard Vessel Classification

................................ .............................. 2-8 Table 2-5 Army Vessel Classification

................................ ................................ ....... 2-11 Table 2-6 Marine Corps Vessel Classification

................................ .......................... 2-12 Table 2-7 Air Force Vessel Classification

................................ ................................ . 2-13
Table 3-1 Incidental Discharges from Vessels of the Armed Forces

........................... 3-3 Table 3-2 States Involved in Initial Consultation Meetings

................................ ......... 3-4 Table 3-3 States Involved in the Second Round of Consultation Meetings

................ 3-5 Table 3-4 Discharges Sampled During Phase I of UNDS

................................ ........... 3-6 Table 3-5 Type of Analysis According to Discharge

................................ ................... 3-7 Table 3-6 Discharges Sampled by Ship

................................ ................................ ....... 3-9 Table 3-7 Analytes and Analytical Methods

................................ .............................. 3-10 Table 3-8 Classical Analytes and Methods

................................ ................................ 3-10
Table 4-1 Aquatic Life Water Quality Criteria

................................ ............................ 4-3 Table 4-2 List of Bioaccumulative Chemicals of Concern

................................ .......... 4-7
Table 5-1 Discharges Requiring the Use of a MPCD and the Basis for the Determination

................................ ................................ ............................ 5-2

LIST OF FIGURES
Figure 2-1 Largest Navy Surface Ship and Submarine Homeports

............................. 2-17 Figure 2-2 Coast Guard Ports with Three or More Vessels Equal to or Longer than 65 Feet

................................ ................................ ................................ ...... 2-18

APPENDICES
Appendix A Nature of Discharge (NOD) and Marine Pollution Control Device (MPCD) Reports

................................ ................................ ..................... A-1 Appendix B Matrix of Navy Vessels and Discharges

................................ .................... B-1 Appendix C Matrix of MSC Vessels and Discharges

................................ .................... C-1 Appendix D Matrix of Coast Guard Vessels and Discharges

................................ ........ D-1 Appendix E Matrix of Army Vessels and Discharges

................................ ................... E-1 Appendix F Matrix of Marine Corps Vessels and Discharges

................................ ....... F-1 Appendix G Matrix of Air Force Vessels and Discharges

................................ .............. G-1ES- 1 

### EXECUTIVE SUMMARY

This Technical Development Document provides the technical background for the Phase I regulation that is issued under authority of the Uniform National Discharge Standards (UNDS) provisions of the Clean Water Act (CWA). The purpose of Phase I of UNDS is to determine those discharges that are incidental to the normal operation of Armed Forces vessels for which it is reasonable and practicable to require the use of a marine pollution control device (MPCD) on at least one vessel class, type, age, or size. An extensive data collection effort was conducted to identify vessels of the Armed Forces producing discharges incidental to normal operations and to characterize those discharges. Initial requests for information were made to each branch of the Armed Forces to obtain discharge information and to help compile a list of vessels that could be subject to UNDS requirements. EPA and DoD identified a list of 39 types of discharges incidental to the normal operations of vessels of the Armed Forces and evaluated them during Phase I of UNDS. Consultations with personnel having equipment expertise were held on each discharge to identify available data and data gaps. Sampling data were collected from various vessels, where needed, to supplement existing data. Concurrently, existing laws and regulations were reviewed, including applicable international, Federal, State, and local standards. In addition, consultation meetings were held with interested Federal agencies, States, and environmental organizations.
The information collected from surveys, consultations, and discharge sampling and analysis was used collectively to evaluate the 39 types of discharges. Phase I decisions were made on these discharges according to the seven factors required to be considered by § 312(n)(2)(B) of the CWA:

• the nature of the discharge;

• the environmental effects of the discharge;

• the practicability of using a MPCD;

• the effect that installing or using the MPCD has on the operation or the operational capability of the vessel;

• applicable United States law;

• applicable international standards; and

• the economic costs of installing and using the MPCD.
The Administrator of the Environmental Protection Agency (“Administrator”) and the Secretary of Defense (“Secretary”) have determined that it is reasonable and practicable to require MPCDs on at least one vessel class, type, age, or size for 25 of the 39 discharges to mitigate adverse impacts or the potential for adverse impacts on the marine environment. These discharges are listed in Table ES-1 along with a brief description of each. For these 25 discharges, assessments of the practicability, operational impact, cost, and environmental effectiveness of potentially available MPCDs were conducted. The Administrator and the Secretary also have determined that it is not reasonable and practicable to require MPCDs for the remaining 14 discharges because these discharges exhibit a low potential to cause adverseES- 2



### impacts to the marine environment. These discharges are listed and briefly described in Table ES-2. Table ES-1. Discharges Determined To Require MPCDs

Discharge Description Aqueous Film-Forming Foam The primary fire-fighting agent used for flammable liquid fires on vessels of the Armed Forces. It is a concentrated liquid that is mixed with seawater to form a 3% to 6% solution which is discharged during planned maintenance, testing, system inspections, and flight deck certifications. Catapult Water Brake Tank and Post-Launch Retraction Exhaust Discharge from the water brake and from retracting catapults on aircraft carriers during aircraft launching operations and testing. Lubricating oil that is applied to the catapult cylinder collects in the water brake tank during these operations and is eventually discharged overboard. Also, expended steam and residual oil are released overboard when the catapult is retracted between launchings and testings. Chain Locker Effluent Seawater and debris that collects in the anchor chain storage locker as a result of anchor chain washdowns, retrievals, and heavy weather. The liquid collects in a sump and is removed by a drainage eductor powered by the shipboard firemain. Clean Ballast Either seawater or freshwater that is transferred into and out of dedicated tanks to adjust a surface ship’s draft and to improve stability under various operating conditions. On submarines, seawater taken aboard into the main ballast system to control buoyancy and into the variable ballast system to control trim, list, and to adjust buoyancy. The discharge is generated when the ballast is no longer required and the tanks are partially or completely emptied. Compensated Fuel Ballast Seawater that is introduced into fuel tanks to maintain the stability of a vessel by compensating for the weight of the expended fuel that is consumed. During refueling, this seawater is displaced overboard. Controllable Pitch Propeller Hydraulic Fluid Hydraulic oil that is released from controllable pitch propeller (CPP) systems under three conditions: leakage through CPP seals, releases during underwater CPP repair and maintenance, or releases from equipment used for CPP blade replacement. Deck Runoff Water runoff from precipitation, freshwater washdowns, and seawater that falls on the exposed decks of a vessel such as a weather deck or flight deck. This water washes off residues from the deck and topside equipment, can be contaminated with materials from other deck activities, and is discharged overboard to receiving waters. Dirty Ballast Seawater that is occasionally pumped into empty fuel tanks for the specific purpose of improving ship stability. Before taking on seawater, fuel in the tank to be ballasted is transferred to another fuel tank or holding tank. Dirty ballast is comprised of residual fuel mixed with seawater. The discharge is generated when the ballast is no longer required and the tanks are partially or completely emptied. Distillation and Reverse Osmosis Brine Seawater concentrate or “brine” that is left over by water purification systems that generate freshwater from seawater for a variety of shipboard applications including potable water for drinking. This “brine” is discharged overboard. Elevator Pit Effluent Liquid from deck runoff and elevator equipment maintenance activities that collects in the bottom of elevator shafts. The liquid waste is either directed overboard, collected for shore-side disposal, or processed along with bilgewater. Firemain Systems Seawater distributed for fire fighting and other services aboard ships. Discharges of firemain water from normal operations occur during firemain testing, maintenance and training activities, anchor chain washdown, and cooling of auxiliary machinery. Gas Turbine Water Wash Wash water discharge from cleaning internal and external propulsion and auxiliary gas turbine components.ES- 3 

### Table ES-1. Discharges Determined To Require MPCDs (contd.)

Discharge Description Graywater Wastewater from showers, galleys, laundries, deck drains, lavatories, interior deck drains, water fountains, miscellaneous shop sinks, and similar sources. Hull Coating Leachate Antifouling agents that leach into surrounding waters from hull coatings designed to prevent corrosion and to inhibit biological growth on the hull surface. Motor Gasoline Compensating Discharge Seawater used to compensate for expended motor gasoline (MOGAS) used to operate equipment stored on some Navy vessels. MOGAS is stored in a compensating tank system to which seawater is added to fuel tanks as fuel is consumed. The discharge occurs as a result of refueling when the displaced water is discharged overboard. Non-Oily Machinery Wastewater Generated from the operation of distilling plants, water chillers, low- and high-pressure air compressors, and propulsion engine jacket coolers. The discharge is captured in a dedicated system of drip pans, funnels, and deck drains to segregate the water from bilgewater, and is either drained directly overboard or into dedicated collection tanks before being discharged overboard. Photographic Laboratory Drains Shipboard photographic lab wastes from processing color and black-and-white film. Typical wastes include spent film processing chemical developers, fixer-bath solutions, and film rinse water. Seawater Cooling Overboard Discharge Seawater used to cool heat exchangers, propulsion plants, and mechanical auxiliary systems. Seawater Piping Biofouling Prevention Anti-fouling compounds such as sodium hypochlorite introduced in seawater cooling systems to inhibit the growth of fouling organisms on interior piping and component surfaces. Small Boat Engine Wet Exhaust Seawater injected into the exhaust of small boat engines for cooling and to quiet operation. Exhaust gas constituents are entrained in the injected seawater and discharged overboard as wet exhaust. Sonar Dome Discharge Some domes that house detection, navigation, and ranging equipment are filled with freshwater and/or seawater to maintain their shape and pressure. The discharge occurs when water from inside the dome is pumped overboard before performing maintenance or repair on the dome and when materials leach from the dome exterior. Submarine Bilgewater Sources of bilgewater include seawater accumulation, normal leakage from machinery, and fresh water washdowns that collect in the bilge. On some submarines, oily wastewater is separated from non-oily wastewater. The oily wastewater is held for shore-side disposal and the non-oily wastewater is discharged overboard.Surface Vessel Bilgewater/OilWater Separator Discharge Sources include condensate from steam systems, boiler blowdowns, water fountains,and machinery space sinks that drain to the bilge. Bilgewater is either held for shoreside disposal or treated in an oil-water separator before being discharged overboard. Underwater Ship Husbandry Discharge from the grooming, maintenance, and repair of hulls and hull appendages performed while a vessel is waterborne. Underwater ship husbandry includes hull cleaning, fiberglass repair, welding, sonar dome repair, non-destructive testing, masker belt repairs, and painting operations. Welldeck Discharges Water and residuals from precipitation, equipment and vehicle washdowns, washing gas turbine engines, graywater from stored landing craft, and general washdowns of welldecks and vehicle storage areas.ES- 4 

### Table ES-2. Discharges Determined To Not Require MPCDs

Discharge Description Boiler Blowdown Water removed from the boiler system to prevent particulates, sludge, and treatment chemical concentrations from accumulating. Catapult Wet Accumulator Discharge Steam and water discharged from the wet accumulator tank to keep the water level in the accumulator within operating limits. The catapult wet accumulator provides steam to operate the catapult during aircraft launching. Cathodic Protection Zinc, aluminum, and chlorine-produced oxidants released during the consumption of sacrificial anodes and the operation of impressed current cathodic protection systems. The purpose of cathodic protection is to prevent hull corrosion. Freshwater Lay-Up Freshwater used to fill condensers when submarine seawater cooling systems are placed in stand-by mode, or “lay-up.” While the condenser is in lay-up mode, the water is discharged and refilled approximately every 30 days. Mine Countermeasures Equipment Lubrication Lubricating grease and oil released from mine countermeasures equipment that is towed behind vessels to locate and destroy mines. Portable Damage Control Drain Pump Discharge Seawater and harbor water that is discharged by the portable damage control drain pumps during pump maintenance, testing, and training. Portable Damage Control Drain Pump Wet Exhaust Water used to quiet and cool the exhaust from gasoline- and kerosene-fueled portable damage control drain pumps. Portable damage control drain pump wet exhaust discharge occurs during training and monthly planned maintenance activities. Refrigeration /Air Conditioning Condensate Condensate from air conditioning, refrigerated spaces, and stand-alone refrigeration units. The condensate is collected in drains and is either discharged directly overboard or held in dedicated tanks before discharge. Rudder Bearing Lubrication Grease and oil used to lubricate rudder bearings. The grease and oil can be released while the vessel is moving, when the rudder is used, or when pierside because the oil lubricant is slightly pressurized. Steam Condensate Condensate from steam used to operate auxiliary systems, such as laundry facilities, heating systems, and other shipboard systems, that drains into collection tanks and is discharged overboard. Stern Tube Seals and Underwater Bearing Lubrication Lubricants used in propeller support struts and bearings that can be released to the environment. Submarine Acoustic Countermeasures Launcher Discharge Water contained in the acoustic countermeasures Mk 2 launch tube after the countermeasures device is expelled.

Submarine Emergency Diesel Engine Wet Exhaust Water used to quiet and cool the exhaust of submarine emergency diesel engines. These emergency diesel engines are operated for equipment checks that occur before submarine deployment, during monthly testing, and during periodic trend analyses. Submarine Outboard Equipment Grease and External Hydraulics Grease applied to a submarine’s outboard equipment. The grease is released to the environment by erosion from mechanical action of seawater while the submarine is underway and by slow dissolution of the grease into the seawater.1-1



### 1. BACKGROUND OF THE UNIFORM NATIONAL DISCHARGE STANDARDS

This chapter provides background on and summarizes the requirements of the Uniform National Discharge Standards (UNDS) legislation. Section 1.1 describes the evolution of the UNDS legislation; section 1.2 cites the legal authority for the UNDS regulations and gives an overview of the scope of UNDS, including key definitions; section 1.3 describes the multi-phase UNDS development process; and section 1.4 lists the references cited in chapter 1.

1.1 Background
Armed Forces vessels produce liquid disc harges that vary greatly in composition, amount, and potential for causing adverse environmental effects. Many are common to nearly all vessels while others are unique to specific vessel types. The composition and volume of a specific discharge may also vary with vessel type and age, installed hardware, operating mode, external environmental conditions, and other factors. Many discharges are discrete waste streams such as graywater (which includes effluent from sources such as sinks, showers, and galleys) and seawater cooling overboard discharge, while others, such as leachate from hull protective coatings, lubricants from various external bearings and joints, and contaminants from other external surfaces are released by direct contact with the marine environment or runoff from precipitation.
In support of national defense and other missions assigned by the President, Armed Forces vessels are required to operate in and visit coastal waters and ports throughout the United States. The potential for different ship discharge requirements between local and State jurisdictions makes it difficult for Armed Forces vessels to simultaneously ensure environmental regulatory compliance and operational readiness. Clear, achievable, and uniform discharge standards would enable the Armed Forces to design, build, and train their crews to operate environmentally sound vessels and simultaneously maintain their ability to meet national defense and other mission requirements. In addition, uniform national standards would result in enhanced environmental protection because standards would be established for certain discharges that presently are not comprehensively regulated. Establishing national standards for discharges from the vessels of the Armed Forces is the purpose of the UNDS program.
In 1990, the Navy began preliminary discussions with various Federal agencies concerning the need for uniform national standards to maintain operational flexibility while promoting environmentally responsible ships. The U.S. Environmental Protection Agency (EPA), the Coast Guard, the National Oceanic and Atmospheric Administration, and other agencies were contacted. The Navy also actively solicited input from the States, recognizing that coastal States, in particular, have a great interest in the quality of the water in and around their ports. State briefings and discussions held before UNDS legislation was passed began in October 1993 and continued through the winter of 1995. 1 

### During the same period, the Navy hosted several information sessions on UNDS with Federal and State environmental officials, environmental interest groups, and congressional staff. As a result, legislation was drafted and sent to Congress.1-2



### Ultimately, Congress enacted UNDS legislation as part of the 1996 Defense Authorization Bill and the President signed the bill into law as part of the National Defense Authorization Act of 1996.
The National Defense Authorization Act established that the purposes of UNDS are to:

• enhance the operational flexibility of vessels of the Armed Forces domestically and internationally;

• stimulate the development of innovative vessel pollution control technology; and

• advance the development by the United States Navy of environmentally sound ships.

1.2 Legal Authority and Statutory R equirements for the UNDS Regulations
Section 325 of the National Defense Authorization Act of 1996, entitled “Discharges from Vessels of the Armed Forces” (Pub. L. 104-106, 110 Stat. 254), amended § 312 and § 502(6) of the Federal Water Pollution Control Act (also known as the Clean Water Act or the CWA) to require the Administrator of the EPA (“Administrator”) and the Secretary of Defense (“Secretary”) to develop uniform national standards to control certain discharges from vessels of the Armed Forces.

1.2.1 Discharges
The UNDS legislation specifies that standards would apply to discharges (other than sewage) incidental to the normal operation of vessels of the Armed Forces unless the Secretary finds that complying with UNDS would not be in the national security interests of the United States (CWA § 312(n)(1)). The standards would apply anytime the vessel is waterborne in inland U.S. waters or within 12 nautical miles (n.m.) from the United States or its territories, regardless of whether the vessel is underway or pierside (see section 1.2.3). Discharges subject to UNDS include discharges from the operation, maintenance, repair, or testing of vessel propulsion systems, maneuvering systems, habitability systems, or installed major systems such as elevators or catapults, and discharges from protective, preservative, or adsorptive hull coatings. UNDS does not apply to discharges overboard of rubbish, trash, garbage, or other such materials; air emissions resulting from a vessel propulsion system, motor driven equipment or incinerator; or discharges that require permitting under the National Pollutant Discharge Elimination System (NPDES) program, Title 40 Part 122 of the Code of Federal Regulations (CFR) (see CWA § 312(a)(12)). UNDS does not apply to discharges containing source, special nuclear, or byproduct materials. These materials are regulated under the Atomic Energy Act of 1954, as amended (42 United States Code (USC) 2011). See Train v. CIPR, Inc., 426 U.S. 1 (1976).

1.2.2 Vessels
Armed Forces vessels subject to the UNDS regulations include most watercraft or other artificial contrivances used, or capable of being used, as a means of water transportation by the Armed Forces. Examples of such vessels are ships, submarines, barges, tugs, floating drydocks,1-3



### and landing craft, as well as boats of all sizes. Armed Forces vessels are any vessel owned or operated by the Department of Defense other than time- or voyage-chartered vessels. This includes vessels of the Navy, Army, Marine Corps, Air Force, and Military Sealift Command (MSC). In addition, a vessel of the Armed Forces is defined as any vessel owned or operated by the Department of Transportation (DOT) that is designated by the Secretary of the Department in which the Coast Guard is operating as a vessel equivalent to a vessel of the DoD. The Secretary of the DOT has determined that Coast Guard vessels are equivalent to DoD vessels and are therefore included as vessels of the Armed Forces for the purposes of UNDS.
A vessel becomes a vessel of the Armed Forces when the government assumes overall operational control of the vessel. Vessel discharges that occur before the government assumes control of the vessel (e.g., vessels under construction) and those that occur during maintenance and repair while the vessel is in drydock are addressed by the NPDES permits issued to the shore facility or the drydock. Discharges related to a floating drydock’s function as a vessel are covered by UNDS and do not require authorization by NPDES permits.
While the majority of Armed Forces vessels are subject to UNDS, there are several classes of vessels that are not subject to UNDS. The Armed Forces vessels that are subject to UNDS and those vessels not subject to UNDS are discussed in detail in chapter 2.

1.2.3 Waters
UNDS is applicable to discharges from Armed Forces vessels when they operate in the navigable waters of the United States and the contiguous zone. As defined in § 502 of the CWA, the term “navigable waters” means all inland waters of the United States, including the Great Lakes, and all waters seaward from the coastline to a distance of three n.m. from the shore of the States, District of Columbia, Commonwealth of Puerto Rico, the Virgin Islands, Guam, American Samoa, the Canal Zone, and the Trust Territories of the Pacific Islands. The contiguous zone extends from three n.m. to 12 n.m. from the coastline. Therefore, UNDS applies to Armed Forces vessel discharges into inland waters and into waters from the shoreline out to 12 n.m. of shore. UNDS is not enforceable beyond the contiguous zone.

1.3 UNDS Development Requirements
Section 312(n) of the CWA requires that UNDS be developed in three phases:

Phase I. The first phase of UNDS requires the Administrator and the Secretary to determine for which Armed Forces vessel discharges it is reasonable and practicable to require control with a marine pollution control device (MPCD) on at least one vessel class, type, age, or size to mitigate potential adverse impacts on the marine environment (CWA § 312(n)(2)). The UNDS legislation states that a MPCD may be a piece of equipment or a management practice designed to control a particular discharge (CWA § 312(a)(13)). The Administrator and the Secretary are required to consider the following seven factors when determining if a discharge requires a MPCD:1-4



### • the nature of the discharge;

• the environmental effects of the discharge;

• the practicability of using the MPCD;

• the effect that installing or using the MPCD has on the operation or the operational capability of the vessel;

• applicable United States laws;

• applicable international standards; and

• the economic costs of installing and using the MPCD.
The Administrator and the Secretary are required to consult with the Secretary of the department in which the Coast Guard is operating (i.e., DOT), the Secretary of Commerce, and interested States during Phase I rule development. The statute provides that after promulgation of the Phase I rule, neither States nor political subdivisions of States may adopt or enforce any State or local statutes or regulations with respect to discharges identified as not requiring control with a MPCD, except to establish no-discharge zones (CWA § 312(n)(6)). A no-discharge zone is an area of water determined by a State or the Administrator to need greater environmental protection than that provided by UNDS. It can encompass one or more discharges that will be prohibited from being released, either treated or untreated, into the waters of the no-discharge zone. In addition, States and their political subdivisions will be similarly prohibited from adopting or enforcing any statutes or regulations affecting discharges that require control with MPCDs once “Phase III” regulations (see below) that govern the design, construction, installation, and use of the MPCDs for those discharges are promulgated.

When there is new, significant information not considered during the Phase I rulemaking that could result in a change to the Phase I discharge determination, § 312(n)(5)(D) of the CWA authorizes the Governor of any State to submit a petition to the Administrator and the Secretary requesting them to re-evaluate whether a discharge requires control. In addition, § 312(n)(5) of the CWA requires the Administrator and the Secretary to review the Phase I determinations every five years and, if necessary, revise the determinations based on significant new information.

Phase II. The second phase of UNDS requires the Secretary and the Administrator to promulgate Federal performance standards for each MPCD determined to be required in Phase I (CWA § 312(n)(3)). Phase II requires that the Secretary of the department in which the Coast Guard is operating, the Secretary of State, the Secretary of Commerce, other interested Federal agencies, and interested States be consulted. When developing performance standards for the MPCDs during Phase II, the Secretary and Administrator must consider the same seven factors that were considered during Phase I (see above), and may establish standards that:

• distinguish between vessel class, type and size;

• distinguish between new and existing vessels; and

• provide a waiver from UNDS requirements as necessary or appropriate for particular classes, types, sizes, or ages of vessels.1-5



### The performance standards devel oped during Phase II are to be issued two years after the Phase I regulation is issued, and reviewed every five years in accordance with § 312(n)(5) of the CWA.

Phase III. The third phase of UNDS requires the Secretary, after consulting with the Administrator and the Secretary of the department in which the Coast Guard is operating, to establish requirements for designing, constructing, installing, and using the MPCDs identified in Phase II (CWA § 312(n)(4)). These requirements will be codified under the authority of the Secretary. Phase III is to be completed within one year after Phase II is promulgated. Following completion of Phase III, neither States nor political subdivisions of States may adopt or enforce any State or local statutes or regulations with respect to discharges identified as requiring control with a MPCD, except to establish no-discharge zones (CWA §312(n)(6)).

1.4 References
1. Quinn, John P., Captain U.S. Navy. “Uniform National Discharge Standards for Armed Forces Vessels: Enhancing Operational Flexibility and Environmental Protection.” Presented at the 22 nd 

### Environmental Symposium and Exhibition of the American Defense Preparedness Association. Orlando, Florida. 21 March 1996.2- 1 

### 2. VESSELS OF THE ARMED FORCES

This chapter describes Armed Forces vessels, to which UNDS is applicable, and clarifies which vessels do not qualify as such. Section 2.1 gives a brief overview of the vessels subject to UNDS; section 2.2 provides a more detailed description of the different vessel types and lists the vessel classes covered by UNDS in each branch of the Armed Forces and those not covered by UNDS; section 2.3 discusses where these vessels operate; and references are listed in section 2.4.

2.1 Introduction
The UNDS legislation defines vessels of the Armed Forces as any vessel owned or operated by the DoD, other than a time or voyage chartered vessel, or any vessel owned or operated by the Department of Transportation (DOT) that is designated by the Secretary of the department in which the Coast Guard is operating as being equivalent to a vessel of the Armed Forces (CWA § 312(a)(14)). The branches of the Armed Forces that own or operate vessels that are subject to UNDS are listed in Table 2-1 along with the number of vessels as of August 1997.

Table 2-1. Armed Forces Vessels Subject to UNDS Regulations

Branch of Armed Forces Branch Abbreviation Number of

Vessels United States Navy USN 4,760 United States Coast Guard USCG 1,445 United States Marine Corps USMC 538 United States Army USA 334 Military Sealift Command MSC 57 United States Air Force USAF 36 TOTAL = 7,170

Categories of vessels that are not covered by UNDS include: commercial vessels; privately owned vessels; vessels owned or operated by State, local, or tribal governments; vessels under the jurisdiction of the Army Corps of Engineers; vessels, other than those of the Coast Guard, under the jurisdiction of the Department of Transportation; vessels owned or operated by other Federal agencies that are not part of the Armed Forces (i.e., Maritime Administration (MARAD) vessels); vessels preserved as memorials and museums; time- and voyage-chartered vessels; vessels under construction; vessels in drydock; and amphibious vehicles. Several categories of these vessels are described in section 2.2.7.
The five largest Navy ports are Norfolk, VA; San Diego, CA; Pearl Harbor, HI; Puget Sound (Bremerton), WA; and Mayport, FL. Numerous other naval ports are located around the country. The largest Coast Guard base is located in Portsmouth, VA; with other major bases in California, Florida, Hawaii, Massachusetts, South Carolina, Texas, and Washington. Fort Eustis,2- 2



### VA, is the primary site for the Army vessels, but the Army also ports vessels in California, Florida, Hawaii, Maryland, North Carolina, and Washington. Military Sealift Command vessels make use of Navy ports, as available, and commercial ports at all other times. Neither the Marine Corps nor the Air Force has a major port. Marine Corps craft are typically stowed aboard larger Navy vessels and maintained and stationed ashore. Air Force vessels are located in Florida, North Carolina, Virginia, New Mexico, and Nevada. Operating locations for Armed Forces vessels are discussed in more detail in Section 2.3.

2.2 Description of Vessel Classes and Types
The number of specific vessel types within each branch of the Armed Forces constantly changes due to vessel commissionings, decommissionings, and transfers within branches of the Armed Forces. In order to maintain consistency, the Armed Forces vessel population as of August 1997 was used in analyses supporting this rule.

2.2.1 Vessels of the U.S. Navy 1 -4



### 2.2.1.1 Navy Mission
The role of the U.S. Navy is to maintain an effective naval fighting force to defend the U.S. during war, and to use this force to prevent conflicts and control crises around the world. The Navy is responsible for organizing, training, and equipping its forces to conduct prompt and sustained combat operations at sea. For combat, as well as humanitarian missions, the Fleet must be capable of quick deployment, while being optimized for carrying personnel, weapons, and supplies whenever and wherever needed.
2.2.1.2 Navy Vessel Description
There are approximately 4,800 Navy vesse ls (active and inactive), the majority of which are small boats and service craft. Navy vessels can be categorized into eight groups according to mission: aircraft carriers, surface combatants, amphibious ships, submarines, auxiliaries, mine warfare ships, small boats and service craft, and inactive assets. Differences in vessel size, mission, and mode of operation are explained below. Table 2-2 summarizes Navy vessel characteristics including length, displacement, and mission for each vessel classification. A summary of vessel-related abbreviations may be found in the Glossary and Abbreviations section.

Aircraft Carriers . Aircraft carriers are the largest vessels in Navy service, averaging approximately 1,100 feet long. They provide combat air support to the fleet. To accomplish this, aircraft carriers have landing and launch platforms for fixed-wing aircraft and helicopters. Carriers are classified as having either conventional propulsion (CV) or non-conventional propulsion (CVN). The USS Nimitz (CVN 68) Class, is the largest class of carriers, composed of ships that are intended to provide fleet support well into the next century. Aircraft carriers are ocean-going vessels that typically operate within 12 n.m. only during transit in and out of port. However, testing and maintenance activities may be conducted in port and during transits.2- 3



### Surface Combatants . Surface combatants provide air defense, ballistic missile defense, antisubmarine warfare support, antisurface warfare support, merchant and carrier group protection, independent patrol operations, and tactical support of land-based forces. They include cruisers (CG and CGN), destroyers (DD and DDG), frigates (FFG), and coastal patrol craft (PC). The Navy’s surface combatants range from 171 feet long (for PCs) to 596 feet long (for CGNs), and may have either conventional or non-conventional propulsion. Surface combatants are ocean-going vessels that, for the most part, operate inside 12 n.m. only during transit in and out of port and for short periods of time to meet mission requirements, such as training. Testing and other systems maintenance activities may be done in port and during transits.
Amphibious Ships . Amphibious ships provide a platform for vertical landing and takeoff of aircraft, primarily helicopters, and conduct launch and recovery operations of smaller landing craft. They include command ships (LCC and AGF), assault ships (LHD, LHA, and LPH), transport docks (LPD), and dock landing ships (LSD). Amphibious ships range from 522 to 844 feet long and use landing craft and helicopters to move Marine Corps equipment and vehicles ashore. Amphibious ships are ocean-going vessels that operate inside 12 n.m. not only during transit in and out of port, but also to train for and perform their designed mission as an interface between water- and land-based operations. Testing and maintenance activities may be performed in port and during transits.

Submarines . Submarines provide strategic missile, battlefield support, stealth strike, special forces, littoral warfare, and other miscellaneous capabilities. They are categorized as attack (SSN), ballistic missile (SSBN), and research and survey (AGSS) types. Navy submarines range from 165 feet long for the research submarine to 560 feet long for ballistic missile submarines. Nearly all submarines in active service have non-conventional propulsion, with the exception of search and rescue types. Submarines are ocean-going vessels that operate inside 12 n.m. for transit in and out of port and to meet mission requirements, such as training. Testing and maintenance activities may be performed in port and during transits.

Auxiliaries . Auxiliary ships provide logistical support, such as underway replenishment of ordnance, fuel, and consumable products (AO and AOE); and rescue and salvage operations (ARS). Submarine tenders (AS) provide maintenance facilities, weapon stores, hospital facilities, and additional berthing space for submarines. Auxiliary vessels range in length from 255 feet to 795 feet. Auxiliaries are ocean-going vessels that typically operate inside 12 n.m. for transit in and out of port or to meet mission requirements. Testing and maintenance activities may be performed in port and during transits.
Mine Warfare Ships . Mine warfare ships (mine countermeasures ships (MCM) and minehunter, coastal (MHC)) conduct minesweeping missions to find, classify, and destroy moored and bottom mines. These vessels range in length from 188 to 224 feet long. Mine warfare vessels primarily operate in coastal waters.2- 4



### Small Boats and Service Craft . Due to their large numbers and diverse duties, small boats and service craft have been summarized collectively in Table 2-2. The Navy owns and operates approximately 4,200 small boats and service craft. Small boats are used as harbor patrol boats, transport boats, work boats (WB), and utility boats (UB). Many of the service craft are non-self-propelled “lighters,” or barges (YC, YFN, YON, and YRBM), used for berthing, office, messing, or repair functions or to carry fuel or equipment. Other small boats and service craft include: tugboats of various sizes (YTB, YTM, and YTL), training patrol craft (YP), landing craft (LCU, LCM, CM, and PL), torpedo retrievers (TWR, TRB, and TR), floating drydocks (AFDB, AFDL, AFDM, ARD, and ARDM), and rigid inflatable boats (designated RB or RIB). Small boats are often kept out of the water when not in use to increase the vessels’ longevity or for storage while transiting to operational areas. Small boats and service craft operate within the waters of the homeport area and other coastal locations within 12 n.m. from shore.

Inactive Assets . The Navy owns and maintains additional surface ships in various states of readiness. These inactive assets are comprised of numerous vessel types with varying missions and capabilities. The Navy also owns and maintains inactive submarines. The significant majority of these inactive assets are scheduled for scrapping or other permanent disposal. Some surface ships might be transferred to MARAD to be made part of the National Defense Reserve Fleet, or might be destined for sale to foreign nations. However, due to the Navy’s retained ownership of these assets, pending final disposal, these vessels are covered under UNDS. These inactive vessels are prepared for long-term storage with their systems and equipment secured or removed and are not operated. They are moored in designated port locations and typically not moved until final disposal.
Table 2-2. Navy Vessel Classification

Vessel Type Ship Class Number Active Class

Length (ft) Displacement

fully loaded (tons) Mission

Aircraft CV 59 1 1,056 82,360 Provide air combat support to Carriers CV 63 3 1,046 81,985 the fleet with landing and

CVN 65 1 1,102 93,970 launch platform for airplanes CVN 68 7 1,092 95,413 and helicopters Surface CG 47 27 567 9,589 Provide air defense, missile Combatants CGN 36 2 596 10,530 defense, antisubmarine and

CGN 38 1 585 11,400 antisurface warfare support, DD 963 31 563 8,280 merchant and carrier group DDG 993 4 563 9,574 protection, independent patrol DDG 51 18 504 8,373 operations, and tactical FFG 7 43 445 3,658 support of land-based forces PC 1 13 171 329 Amphibious LCC 19 2 636 16,790 Provide a landing and take-off Ships AGF 3 1 522 13,900 platform for aircraft, primarily

AGF 11 1 569 16,912 helicopters, and a means for LHD 1 4 844 40,530 launching and recovering LHA 1 5 834 39,967 smaller landing craft2- 5 

### Table 2-2. Navy Vessel Classification (contd.)

Vessel Type Ship Class Number Active Class

Length (ft) Displacement

fully loaded (tons) Mission

Amphibious LPD 4 3 569 17,595 Ships (contd.) LPD 7 3 569 17,595

LPD 14 2 569 17,595 LPH 2 2 602 18,300 LSD 36 5 553 13,680 LSD 41 8 609 16,165 LSD 49 3 609 16,695 Submarines SSN 671 1 315 5,284 Provide strategic missile

SSN 637 13 302 4,250 defense, search SSN 688 56 360 6,300 and rescue, and research and AGSS 555 1 165 860 survey capability SSBN 726 17 560 16,754 Auxiliaries AOE 1 4 795 53,600 Provide logistical support,

AOE 6 3 755 48,800 such as underway AO 177 5 708 37,866 replenishment, material AS 33 1 644 19,934 support, and rescue and AS 39 3 646 22,650 salvage operations ARS 50 4 255 3,193 Mine Warfare MCM 1 14 224 1,312 Conduct minesweeping Ships MHC 51 12 188 918 missions to find and destroy mines Small Boats YTB 760 68 109 356 Provide a variety of services. and Service YTB 756 3 109 409 Includes: patrol training craft Craft YTB 752 1 101 375 (YP), tug boats (YTB),

YTT 9 3 187 1,200 torpedo trials craft (YTT), YP 654 1

-- -- landing craft, barges, transport YP 676 27

-- -- boats, personnel boats, harbor Various others 4,089 12-192

-- patrol boats, work boats, utility boats, floating drydocks, and rigid inflatable boats Inactive Assets Various

surface ships 228

-- -- Vessels in various states of readiness, the majority of which are scheduled for Varioussubmarines 16

-- -- scrapping, transfer to MARAD, or sale to foreign nations.

TOTAL Vessels = 4,760



### 2.2.2 Vessels of the Military Sealift Command 1 ,5,6



### 2.2.2.1 Military Sealift Command Mission
The Military Sealift Command (MSC) transports DoD materials and supplies, provides towing and salvage services, and conducts specialized missions for Federal agencies. To2- 6



### accomplish this mission, the MSC maintains and operates a fleet of vessels classified within four major maritime programs: the Special Mission Support Force (SMSF), the Naval Fleet Auxiliary Force (NFAF), Strategic Sealift, and the Afloat Prepositioning Force (APF, which is sometimes categorized under Strategic Sealift). Consistent with the definition of vessel of the Armed Forces in CWA § 312(a)(14), UNDS does not apply to chartered Strategic Sealift and APF vessels.
Table 2-3 summarizes MSC vessel characteristics including length, displacement, and mission for each vessel classification. MSC owned vessels are differentiated from Navy vessels by the prefix, “T-” (e.g., T-AGOS and T-AGS). Although MARAD’s Ready Reserve Force (RRF) ships come under the direction of the MSC and its Strategic Sealift program when activated, they are normally maintained and crewed by MARAD. RRF ships are discussed in section 2.2.7.2 in conjunction with other MARAD vessels.
2.2.2.2 Special Mission Support Force
The MSC’s Special Mission Support Force (SMSF) includes ships designed to support the Navy, Air Force, and the Army in specialized military missions. SMSF vessels often operate in remote areas to conduct undersea surveillance, missile range tracking, oceanographic and hydrographic surveys, acoustic research, and submarine escort. SMSF vessels range from 234 feet to 595 feet long. They include the following vessel types: ocean surveillance (AGOS), surveying (AGS), miscellaneous (AG) navigation test support and acoustic research; missile range instrumentation (AGM), and cable repairing (ARC) vessels. The vessels are operated by civil service mariners or mariners under contract to the MSC. SMSF vessels are ocean-going ships that operate inside 12 n.m. during transit in and out of port or to meet mission requirements. Additionally, cable repairing vessels may operate frequently inside 12 n.m. for mission purposes. Testing and maintenance activities may be conducted in port and during transits.
2.2.2.3 Naval Fleet Auxiliary Force
The MSC’s Naval Fleet Auxiliary Force (NFAF) is comprised of auxiliary ships that provide underway replenishment services to Navy surface combatants, in addition to ocean towing and salvage services. By transporting and delivering fuel, food, spare parts and equipment, and ammunition, NFAF ships enable surface combatants to remain at sea for extended periods. NFAF vessels are between 240 feet and 677 feet in length. The NFAF vessels are ocean-going, and typically operate inside 12 n.m. only to transit in and out of port or to meet certain mission requirements. Testing and maintenance activities may be conducted in port and during transits.2- 7 

### Table 2-3. Military Sealift Command Vessel Classification 6

MSC Maritime Program Classification Class/Ship Number Active Class

Length (ft) Displacement

fully loaded (tons) Mission

SMSF T-AGOS 5 234 3,438 Support the Armed

T-AGOS 4 285 2,558 Forces in specialized T-AGS 9 442 12,208 missions such as T-AG 2 455 11,860 undersea surveillance, T-AGM 1 595 21,478 missile range tracking, T-ARC 1 502 14,225 oceanographic and hydrographic surveys, acoustic research, and submarine escort NFAF T-AE 8 563 19,937 Provide underway

T-AFS 8 523 16,792 replenishment services T-AO 12 677 40,700 (i.e., deliver fuel, food, T-ATF 7 240 2,260 spare parts, equipment, and ammunition) to Navy surface combatants, as well as ocean towing and salvage services TOTAL Vessels = 57



### 2.2.3 Vessels of the U.S. Coast Guard 1,7,8



### 2.2.3.1 Coast Guard Mission
The Coast Guard is part of DOT and is responsible for enforcing laws on the waters of the U.S., including coastal waters, oceans, lakes, and rivers that are subject to the jurisdiction of the U.S. During war, the Coast Guard may become part of the Navy. The principal peacetime missions of the Coast Guard are enforcing recreational boating safety, conducting search and rescue operations, maintaining aids to navigation (e.g., lighthouses and navigational lights), ensuring merchant marine safety (e.g., via vessel inspection and operator certification), providing drug interdiction, and participating in environmental protection efforts. The Coast Guard also carries out port safety responsibilities (e.g., icebreaking), enforces laws and treaties (e.g., customs, immigration, and fisheries law enforcement), and, ultimately, defends U.S. harbors and coasts during war. Table 2-4 summarizes Coast Guard vessel characteristics including length, displacement, and mission for each vessel classification.
2.2.3.2 Coast Guard Vessel Description

Cutters . Coast Guard cutters are vessels 65 feet or longer that are capable of accommodating crew living on board. Cutters are used for patrol, air defense, search and rescue, and drug interdiction. High endurance cutters (WHEC), medium endurance cutters (WMEC),2- 8 

### Table 2-4. Coast Guard Vessel Classification

Vessel Classification Ship Class Number Active Class

Length (ft) Displacement

fully loaded (tons) Mission

Cutters Hamilton

WHEC 715 12 378 3,050 Provide multi-mission capability, including patrol, Bear WMEC 901 13 270 1,820 air defense, search and rescue, and drug interdiction Reliance WMEC 615 16 210 1,007

Storis WMEC 38 1 230 1,925

Escape WMEC 6 1 213 1,745

Island WPB 1301 49 110 155

Point WPB 82301 36 82 69

Tenders Juniper

WLB 201 2 225 2,000 Used to maintain inland, river, coastal, and offshore Balsam WLB 62 23 180 1,038 buoys and navigational aids, or to serve as a construction Ida Lewis WLM 2 175 916 platform

Red WLM 5 157 525

White WLM 4 133 600

Buckthorn WLI 1 100 200

Cosmos WLI 293 1 100 178

Berry WLI 4 65 71

Pamlico WLIC 4 160 416

Cosmos WLIC 3 100 178

Anvil WLIC 7 75 145

Sumac WLR 1 115 478

Kankakee WLR 3 75 1722- 9 

### Table 2-4. Coast Guard Vessel Classification (contd.)

Vessel Classification Ship Class Number Active Class

Length (ft) Displacement

fully loaded (tons) Mission

Tenders (contd.) Gasconade

WLR 10 75 141

Ouachita WLR 6 65 143

Icebreakers Polar

WAGB 10 2 399 13,190 Support the winter icebreaking efforts in order to Mackinaw WAGB 83 1 290 5,320 maintain open waterways in the Arctic, Antarctic, and the northern regions of the U.S. including the Great Lakes, Northwest, and Northeast Tugboats Bay

WTGB 9 140 662 Provide towing and support services (icebreaking, search Capstan WYTL 11 65 72 and rescue, and law enforcement) to other vessels Small Boats and Craft Various 1,217 22-58 2-32 Used in harbors (drug interdiction, port security, cable repair, harbors and inland waters, navigation aids, illegal dumping, search and rescue, etc.), in rough surf for rescue, for inland river and lake patrol, as transports, and for firefighting Other Vessels Eagle

WIX 327 1 295 1,784 A sailing cutter used for training

TOTAL Vessels = 1,445


### and patrol boats (WPB) have multi-mission capabilities due to features such as anti-ship missiles, gun systems, and other weapon systems. Because of these capabilities, the cutters are strategically stationed along the Atlantic and Pacific coasts of the U.S. The Coast Guard no longer maintains anti-submarine warfare capability. WHECs perform patrol, air defense, and search-and rescue operations, and can remain at sea for 30-45 days without support. This compares to 10-30 days at sea for WMECs and 1-7 days for WPBs. The cutters range in length from 82 feet to 378 feet. Cutters are ocean-going vessels. However, they operate inside 12 n.m. during transit in and out of port, and during certain patrol or search and rescue missions. Testing and maintenance activities may be performed in port and during transits.

Tenders . Tenders are a specific type of cutter used to maintain inland, river, inshore, coastal, and offshore buoys and navigational aids, or to serve as a construction platform in inland waters. Coast Guard tenders range in size from 65 to 225 feet in length to accommodate numerous and diverse tasks. Tenders are operated frequently inside 12 n.m.2- 10



### Icebreakers . Icebreakers have multi-mission capabilities and are often equipped with hangar decks, flight decks, gun systems, and arctic or oceanographic laboratories. They primarily support winter icebreaking efforts in order to maintain open waterways in the Arctic and Antarctic, and the northern regions of the U.S. including the Great Lakes, Northwest (e.g., Alaska and Washington), and Northeast (e.g., Maine and Massachusetts). The Coast Guard icebreakers range in length from 290 to 399 feet. Icebreakers are frequently operated inside 12

n.m.
Tugboats . Tugboats operate in various capacities, providing towing and support services to other vessels. Icebreaking tugs (WTGB) are 140 feet long and specially designed to break through thick ice. By joining this tug with a work barge, it can also be used to maintain aids to navigation. Small harbor tugs (WYTL) are 65 feet long and, in addition to towing, can perform law enforcement and search and rescue operations. They have also been used for small-scale icebreaking, firefighting, delivering humanitarian aid, and assisting in spill containment. Tugboats usually operate within 12 n.m. of shore; however, specific missions may require them to operate beyond 12 n.m.

Small Boats and Craft . Small boats and craft are used for various harbor duties, rough surf rescues, inland river and lake patrols, transporting equipment, and firefighting. Some of these vessels can be transported by trailer and used on any inland waterway in the U.S. Due to their numbers and diversity, small boats and craft of the Coast Guard have been summarized collectively in Table 2-4.

Other Vessels . Coast Guard Academy cadets use the Coast Guard’s training cutter (WIX), a multi-masted sailing vessel, as a summer training vessel.

2.2.4 Vessels of the U.S. Army 1,9,10



### 2.2.4.1 Army Mission
The role of the Army is to preserve the peace and security, and provide for the defense of the U.S., territories, commonwealths, possessions, and any areas occupied by the U.S. The Army has land and aviation combat forces, augmented, in part, by waterborne transport vessels. Army vessels are used primarily for ship to shore transfer of equipment, cargo, and personnel.
2.2.4.2 Army Vessel Description
The Army’s flee t is divided into three sections: the Transportation Corps, the Intelligence and Security (I&S) Command, and the Corps of Engineers (COE). The COE operates survey and construction craft, tugs, barges, and other utility craft. COE boats and craft are not covered by UNDS as described in section 2.2.7.1.
The Army Transportation Corps operates lighterage and floating utility vessels.Lighterage are craft used to transport equipment, cargo, and personnel between ships, from shipto-shore, and for operational mission support, and include logistics support vessels, landing craft,2- 11



### and modular powered causeway ferries. Floating utility craft are used to perform port terminal operations and include ocean and harbor tugs, floating cranes, barges, and floating causeways. Army Transportation Corps vessels operate primarily within 12 n.m., with the exception of the LSV, LCU-2000, and the LT-28, which are ocean-going.
Army I&S vessels are aerostat radar-equipped patrol ships operated in the Caribbean Sea to counter illegal drug flights. The patrol ships operate within 12 n.m. during transit in and out of port, but most often operate outside of 12 n.m. Table 2 -5 summarizes Army vessel characteristics including length, displacement, and mission for each vessel classification.
Table 2-5. Army Vessel Classification 4, 8

Vessel Type Vessel

Classification Number

Active Class

Length (ft) Displacement

fully loaded (tons) Mission

Lighterage LSV 6 273 4,199 Transport equipment, cargo,

LCU-2000 35 174 1,087 and personnel between ships, LCU -1600 13 135 390 from ship to shore, or for LCM-8 104 74 111 operational mission support CF 1

-- -- Floating BC 37 120 760 Perform port terminal Utility BD 10 140 1630 operations

BG 8 120 763 BK 7 45 33 CHI 1 25

-- FB 2 75 64 HF 1 65

-- J-Boat 4 46 12 LT-128 6 128 1,057 LT-100 16 107 390 PB 10 25

-- Q-Boat 1 65 37 SLWT 4

-- -- ST-65 11 71 122 ST-45 2 45 29 T-Boat 1 65

-- Workboats 47

-- -- Patrol Ships ABT 7 190-194 1500-1,900 Perform drug interdiction in the Caribbean Sea TOTAL Vessels = 3342- 12



### 2.2.5 Vessels of the U.S. Marine Corps 1,11



### 2.2.5.1 Marine Corps Mission
As part of the Department of the Navy and in conjunction with the other Armed Forces, the Marine Corps develops the tactics, techniques, and equipment necessary to employ forces onto land from the sea.
2.2.5.2 Marine Corps Vessel Description
The Marine Corps operates a large number of watercraft and amphibious craft used during special operations. Assets that are primarily land-operated vehicles, such as the amphibious assault vehicles (AAVs), are not included under UNDS. The watercraft consist of inflatable combat rubber raiding craft (CRRC) and fiberglass rigid raiding craft (RRC). The CRRCs are used for in-port, river, lake, and coastal operations, and can be transported to the combat area by nearly all of the Navy’s vessels. The RRCs are normally deployed aboard Navy transport dock ships (i.e., LPDs) for transport to the combat area. The CRRCs and RRCs operate exclusively in coastal waters. Table 2-6 summarizes Marine Corps vessel characteristics including length, weight, and mission for each vessel classification.

Table 2-6. Marine Corps Vessel Classification

Vessel Type Description Number Active Class

Length (ft) Weight

(lbs) Mission

RRC Rigid Raiding Craft 120 18

-- Perform offensive CRRC Zodiak

(replacing RRCs) 418 15 265 (without the engine) amphibious operations

TOTAL Vessels = 538



### 2.2.6 Ve ssels of the U.S. Air Force 1



### 2.2.6.1 Air Force Mission
The U.S. Air Force defends the U.S. through control and exploitation of air and space. The Air Force provides land and space-based air forces needed to establish air support for ground forces in combat and the primary airlift capability for use by all of the nation’s military services. The Air Force operates vessels to support this mission.
2.2.6.2 Air Force Vessel Description

Missile retrievers (MRs) are aluminum vessels used for the location and recovery of practice missiles. MRs range in length from 65 to 120 feet. These vessels primarily operate within 12 n.m.2- 13



### Floating utility vessels provide logistics support for Air Force operations and include utility boats (U), training and recovery boats (TR), and personnel boats (P) ranging in length from 17 to 40 feet. These vessels operate almost entirely within 12 n.m. Table 2-7 summarizes Air Force vessel characteristics including length, displacement, and mission for each vessel classification.

Table 2-7. Air Force Vessel Classification

Vessel Type Vessel

Classification Number

Active Class

Length (ft) Displacement

fully loaded (tons) Mission

Missile Retrievers MR 5 65-120 90-133 Locate and recover practice missiles Floating U 27 17-33

-- Used for personnel and utility Utility TR 2 21-25

-- transport, training, and repair

P 2 22-40

-- operations TOTAL Vessels = 36



### 2.2.7 Vessels Not Covered by UNDS
UNDS applies only to Armed Forces vessels. UNDS does not a pply to commercial vessels; privately owned vessels; vessels owned or operated by State, local, or tribal governments; or vessels owned or operated by Federal agencies that are not part of the Armed Forces. In addition, several other categories of vessels are not covered by UNDS, including: 1) vessels under the jurisdiction of the Army COE; 2) vessels, other than those of the Coast Guard, under the jurisdiction of the DOT (e.g., MARAD vessels); 3) vessels preserved as memorials and museums; 4) time- and voyage- chartered vessels; 5) vessels under construction; 6) vessels in drydock; and 7) amphibious vehicles. These vessels are discussed below.
2.2.7.1 Army Corps of Engineers Vessels
Army Corps of Engineers vessels are typically used for civil works p urposes. Congress has consistently addressed the Army Corps of Engineers separately from other parts of the DoD in both authorization and appropriations bills. 12 

### The DoD and EPA do not consider that Congress intended to apply UNDS to Army Corps of Engineers vessels. Therefore, vessels of the Army Corps of Engineers are not covered by UNDS.

2.2.7.2 Maritime Administration Vessels
A number of vessels are operated or maintained by the Maritime Administration (MARAD), which is a part of the DOT. As established in § 312(a)(14) of the CWA, the definition of “vessel of the Armed Forces” includes those DOT vessels that are designated by the Secretary of the department in which the U.S. Coast Guard is operating (currently the DOT) as operating as a vessel equivalent to a DoD vessel. The Secretary of Transportation has2- 14



### determined that MARAD vessels, including the National Defense Reserve Fleet, do not operate equivalently to DoD vessels, and therefore, MARAD vessels are not covered by UNDS. 13



### 2.2.7.3 Vessels Preserved as Memorials and Museums
Ships and submarines preserved as memorials and museums once served a military mission. However, with the exception of one submarine, these vessels are no longer owned or operated by the Armed Forces, and therefore, they are not vessels of the Armed Forces, and UNDS does not apply to them. The Navy owns and operates the submarine Nautilus as a museum; however, the vessel is stationary and its systems are not routinely operated. Therefore, the EPA and DoD have excluded this vessel from the scope of UNDS.
2.2.7.4 Time- and Voyage-Chartered Vessels
Section 312(a)(14) of the CWA specifically excludes time- and voyage-chartered vessels from the definition of “vessels of the Armed Forces.” Time- and voyage-chartered vessels are vessels operating under a contract between the vessel owner and a charterer (in this case, the Armed Forces) whereby the charterer hires the vessel for a specified time period or voyage, respectively. Such vessels at all times remain manned and navigated by the owner, and they are not owned and operated by the Armed Forces. Examples of chartered vessels are those operated by the MSC in the APF and the Strategic Sealift Program.

2.2.7.5 Vessels Under Construction

EPA and DoD do not consider a vessel under construction for the DoD or Coast Guard, and for which the Federal government has not taken custody, to be a “vessel of the Armed Forces.” Therefore, UNDS does not apply to these vessels until the Federal government gains custody.
2.2.7.6 Vessels in Drydock
The statutory definition of “discharge incidental to the normal operation of a vessel” includes incidental discharges whenever the vessel is waterborne. See CWA § 312(a)(12). UNDS does not apply to discharges from vessels while they are in drydock (either land-based or floating) because they are not waterborne, even if the discharges would otherwise meet the definition of a “discharge incidental to the normal operation of a vessel.”
2.2.7.7 Amphibious Vehicles

EPA and DoD do not con sider amphibious vehicles as vessels for the purposes of UNDS because they are operated primarily as vehicles on land. Water use of these vehicles is of short duration for near-shore transit to and from vessels.2- 15



### 2.3 Locations of Armed Forces Vessels

2.3.1 Homeports
Homeports are the bases from which vessels perform the majority of their operations that occur within 12 n.m. of shore, and thus give an indication of the zones where most vessel discharges occur. The sizes and locations of Armed Forces homeports vary with the mission of the vessels they service. Homeports provide pierside services (e.g., potable water, sewage and trash disposal, and electrical power), supplies (e.g., repair parts, cleaning materials, and food); and maintenance and repair functions (e.g., drydock, afloat, and shoreside services).

2.3.1.1 Navy Ports
Norfolk, VA; San Diego, CA; Mayport, FL; Puget Sound, WA; and Pearl Harbor, HI are the five largest Navy ports based on the number of ships serviced. In addition to these five ports, the Navy has many comparably sized and smaller ports throughout the U.S. UNDS evaluations pertain to all U.S. ports, and are not limited to those mentioned above. Figure 2-1 shows the location of homeports for Navy surface ships and submarines only, and the approximate vessel distribution. Inactive vessels and vessels ported outside of the U.S. (e.g., in Japan or Bahrain) are not shown, nor is the distribution of small boats and craft. Small boats and craft are widely distributed with heavy concentrations near San Diego and Norfolk.

2.3.1.2 Coast Guard Ports
Coast Guard duty stations are found on coastal waters, as well as on rivers, lakes, and other inland waterways throughout the U.S. Figure 2-2 shows the Coast Guard homeport locations having three or more vessels that are 65 feet or greater in length. Using the number of large vessels as an indication of base size, the largest Coast Guard bases are located in Portsmouth, VA; Honolulu, HI; Boston, MA; Charleston, SC; Alameda, CA; Galveston, TX; Seattle, WA; and St. Petersburg, FL. Some of the mid-sized bases are located in Corpus Christi, TX; Key West, FL; Roosevelt Roads, PR; and Miami Beach, FL. There is a ship repair and overhaul facility in Baltimore, MD. Ship repair and overhaul is usually done at a commercial facility near the homeport of the vessel.

2.3.1.3 Army Ports
The Army has one major active-component port facility at Fort Eustis near Newport News, VA. In addition, smaller active and reserve-component port facilities are located in Accotink, VA; Baltimore, MD; Cieba, PR; Edgewood, MD; Ford Island, HI; Morehead City, NC; Oakland, CA; Palakta, FL; St. Petersburg, FL; Stockton, CA; Tacoma, WA; and Virginia Beach, VA. Repair, overhaul, and planned maintenance is performed at commercial shipyards located near the homeport of the vessel.2- 16



### 2.3.1.4 Military Sealift Command, Marine Corps, and Air Force Port Usage
The Military Sealift Command makes use of Navy ports, as available, and commercial ports at all other times. The Marine Corps and Air Force make use of local port facilities, since they operate no major port facilities of their own. Air Force floating utility vessel locations include Alamogordo, NM; Cape Canaveral, FL; Fayetteville, NC; Goldsboro, NC; Langley, VA; Las Vegas, NV; Melbourne, FL; and Pensacola, FL. Air Force missile retrievers are located at Panama City, FL; Key West, FL; and Carrabelle, FL.

2.3.2 Operation within Navigable Waters of the U.S. and the Contiguous Zone
UNDS applies to discharges from Arm ed Forces vessels in the navigable waters of the U.S. and the contiguous zone. As defined in the CWA (§ 502(7)), the term “navigable waters” means waters of the U.S., including the Great Lakes, and includes waters seaward from the coastline to a distance of 3 nautical miles from the shore of the States, District of Columbia, Commonwealth of Puerto Rico, the Virgin Islands, Guam, American Samoa, the Canal Zone, and the Trust Territories of the Pacific Islands. The contiguous zone extends from 3 nautical miles to 12 nautical miles from the coastline. Discharges that occur within this zone that extends 12 n.m. from shore are addressed in following chapters. UNDS is not enforceable beyond the contiguous

zone.
The amount of time each vessel spends in its ho meport varies based on factors such as vessel class, command, assignment/demand, and budget. For the purposes of UNDS, the DoD estimated the amount of time spent each year in waters subject to UNDS requirements for each vessel type, as discussed below.
Ocean-going vessels operate inside 12 n.m. while transiting in and out of port. Periodically, they may also be used for mission or training exercises within this zone. Service craft and small boats operate far more frequently near the homeport and within 12 n.m. These vessels may be stowed aboard ships while in transit to operational areas. When in port, small boats and craft are often removed from the water until the next required use.
The DoD and EPA used five years of Navy, Coast Guard, and MSC ves sel movement data to support the estimation of time spent within 12 n.m.. 14 

### From this operational data, the average number of port entries, port exits, and days spent in port was determined for most vessel classes.
The DoD data on ship movement was orig inally organized as a series of trips from one point to another for each ship. Each record contained a succeeding trip leg. For example, if a ship went from Norfolk to Mayport, it may have been reported as a single trip with the date and time of departure from Norfolk recorded as the departure, and the date and time it arrived in Mayport as the arrival. It may also have been reported as a series of trips from Norfolk to some latitude/longitude pair in the Atlantic, from that latitude/longitude to another, from the second latitude/longitude to a third, etc., with the last entry being a trip from the last latitude/longitude to2-17Figure 2-1. Largest Navy Surface Ship and Submarine HomeportsPEARL HARBOR, HI (4a, 23s, 12sc)NORFOLK, VA (5a, 12am, 6c, 17s, 41sc)SAN DIEGO, CA (1a, 16am, 1c, 8s, 35sc)MAYPORT, FL (1c, 23sc)GROTON, CT (21s)INGLESIDE, TX (21mw)LITTLE CREEK, VA (2a, 8am, 9sc)BANGOR, WA (9s)KINGS BAY, GA (9s)EARLE, NJ (3a)PASCAGOULA, MS (4sc)BREMERTON, WA (3a, 1c, 1sc)EVERETT, WA (1c, 6sc)Legend:a = auxiliariesam = amphibious shipsc = carriersmw = mine warfare shipss = submarinessc = surface combatants2- 18 

### Figure 2-2. Coast Guard Ports with Three or More Vessels Equal to or Longer than 65 Feet PORTSMOUTH, VA (11) ALAMEDA, CA (4)

HONOLULU, HI (7) CAPE CANAVERAL, FL (3)

CORPUS CHRISTI, TX (3) SEATTLE, WA (6)

NEWPORT, RI (4) BOSTON, MA (5)

CHARLESTON, SC (5) BAYONNE, NJ (4)

MOBILE, AL (7) PHILADELPHIA, PA (3) ROCKLAND, ME (5)

SAN PEDRO, CA (4) NEW LONDON, CT (3)

NEW ORLEANS, LA (3) ST. LOUIS, MO (3)

ROOSEVELT ROADS, PR (5) GALVESTON, TX (5) MAYPORT, FL (3)

KEY WEST, FL (4)

MIAMI BEACH, FL (9) ST. PETERSBURG, FL (4) CAPE MAY, NJ (7) WOODS HOLE, MA (4) SOUTH PORTLAND, ME (3)2-19



### Mayport. Each of the legs of the journey was recorded as a separate record. All of one ship’s trips for the given year (1991, 1992, 1993, 1994, or 1995) were recorded in succession, before going on to the next ship. Since the records were in order, it was obvious if there were missing entries in the data. A missing entry consisted of a ship arriving at a location in one record, and then departing from a different location in the next record.
The first step was to translate the data from the format received into a format that was usable for the purposes of UNDS. For the purposes of UNDS, it was more useful to know when the ship arrived at and departed from a specific location (i.e., a U.S. port), as opposed to looking at individual trip legs. Therefore, the DoD created a simplified database that was obtained by taking the arrival location and time from one record, and the departure time and location from the next. At this point, the data was filtered to exclude data where the location began with a latitude/longitude pair, and where the arrival location and departure location were not the same (i.e., a missing entry).

The UNDS program only used the ship/year data from ships where complete data was available for the entire year. If there was a complete record of where that ship was for the entire year, the number of days that that ship spent in U.S. ports that year, and the number of times it transited into and out of any U.S. port that year were recorded. The number of transits and daysin port were totaled for every ship in the class, and that total was divided by the number of shipyears compiled in order to derive averages for that ship class. These final numbers can be interpreted as the number of transits into and out of U.S. ports and the number of days spent in U.S. ports for a typical ship of that class.
These numbers vary widely between ship classes due to differing missions, operational schedules, maintenance, etc.. For instance, a typical DDG 51 Class destroyer averages 101 days per year in port with 11 transits in and out, compared to a typical ARS 50 Class salvage ship which may spend an average of 208 days per year in port with 22 transits. The number of days spent in port and the number of transits per year can vary significantly for the same vessel in different years due to varying operational and maintenance schedules. For example, the aircraft carrier CVN 68 spent 10 days in port with two transits in 1995, compared to 237 days in port and nine transits in 1992. For non-self-propelled vessels (e.g., barges, cranes, and dry dock companion craft) or harbor-oriented vessels (e.g., harbor utility craft, dredges, and harbor tugs), it was assumed that the vessels operate within 12 n.m. from shore for the entire year.
By multiplying these typical numbers of days in port and number of transits by the number of ships in that ship class in service in any given year, a reasonable approximation of the total number of days spent in U.S. ports and the total number of transits into and out of U.S. ports for all ships in that class during the year in question was calculated. These values were then used in combination with pollutant concentration data to calculate mass loadings for vessel discharges.
Based on Navy and Coast Guard operational experience, four hours are typically required for each one-way transit between port and 12 n.m. (The estimated vessel transit time from shore to 3 n.m. is approximately 2-3 hours for most locations. A vessel typically requires one additional hour in order to traverse to 12 n.m. from 3 n.m.) Significantly longer transits, such as2-20



### 11 hours to travel 12 n.m. offshore from Puget Sound can occur, but are atypical. Ten hours may be required in Puget Sound to travel 3 n.m. from the overall shoreline because the port is located in an inlet at the southern end of the Sound, requiring travel through both the Sound and the Straits of Juan de Fuca. This creates a transit distance that is actually greater than 3 n.m. when measured from the port itself.

2.4 References

1. UNDS Vessel Database. August 1997. 2. Polmar, Norman. The Naval Institute Guide to the Ships and Aircraft of the U.S. Fleet , 16 th 

### ed. Annapolis: Naval Institute Press. 1997. 3. Prezelin, Bernard (Ed.). The Naval Institute Guide to Combat Fleets of the World

. Compiled by A.D. Baker III. U.S. Annapolis: Naval Institute Press. 1995. 4. Naval Sea Systems Command. Data Book for Boats and Craft of the United States Navy
, NAVSEA 0900-LP-084-3010, Revision A. 15 May 1988. 5. Commander, Military Sealift Command. “Force Inventory.” Report # 3110-4. Publication 4. 1 June 1996. 6. Military Sealift Command. “Mission Service to Customers, MSC’s Five Programs.” 1997. 7. Saunders, N. T. (U.S. Coast Guard, Assistant Commandant for Operations). “Register of Cutters of the U.S. Coast Guard.” COMDTINST M5441.5L. 18 November 1996. 8. Scheina, Robert L. U.S. Coast Guard Cutters & Craft 1946-1990 . Annapolis: Naval Institute Press. 1990. 9. Brown, Daniel G. (U.S. Army, Chief of Transportation). Army Watercraft Master Plan

. November 1996. 10. United States Army, Office of the Chief of Transportation (OCOT). “Marine Qualification Division.” 10 June 1996. 11. Halberstadt, Hans. U.S. Navy Seals in Action . Motorbooks International. 1995. 12. Fatz, Raymond J. (Department of the Army, Deputy Assistant Secretary; Environment, Safety and Occupational Health). Memorandum through Deputy Assistant Secretary of the Navy (Environment & Safety). “Status of Army Actions on the Uniform National Discharge Standards.” 19 May 1997. 13. Delpercio, M. Jr. (Department of Transportation, MARAD, Office of Ship Operations). Letter to Capt. J. W. Taylor (U.S. Navy, CNO N45) regarding applicability of UNDS to the Maritime Administration’s National Defense Reserve Fleet. 27 March 1997. 14. Pentagon. “USN, USCG, and MSC Vessel Movement Data from 1991-1995.3-1 

### 3. DATA COLLECTION

This chapter describes the efforts that were made to obtain informat ion on the UNDS discharges. An overview of the information collection effort is presented in section 3.1; the surveys issued to gather discharge information are described in section 3.2 along with the list of incidental discharges from Armed Forces vessels that resulted; the consultations with personnel having discharge expertise to review information and identify data gaps are described in section 3.3; section 3.4 describes the consultation and outreach efforts with organizations outside DoD; section 3.5 discusses the approach to discharge sampling and analysis; and section 3.6 lists the references cited in Chapter 3.

3.1 Introduction
Section 312(n)(2)(B) of the CWA lists seven factors to consider when determining if a vessel discharge should be controlled by a MPCD (see section 1.3). One of these factors is the “nature of the discharge.” T o comprehensively consider this factor as well as the other six factors, EPA and DoD jointly established an UNDS Technical Working Group (TWG) composed of representatives from EPA and the Armed Forces. The TWG gathered and analyzed technical data to identify: 1) the universe of Armed Forces vessels subject to UNDS requirements (described in chapter 2); 2) the characteristics of the vessel discharges, including sources, frequencies, amounts, and specific constituents; 3) relevant U.S. laws, regulations, and international standards that limit or otherwise set standards on the amount of contamination allowed in the discharges; and 4) any controls that are currently in place.
Initial requests were made to each branch of the Armed Forces for discharge information and for information that would allow a list of vessels subject to UNDS requirements to be compiled. Personnel within and outside DoD with specific discharge expertise were consulted to help identify additional available data and data gaps. Where needed, sampling data were collected from various Armed Forces vessels to supplement existing data. The methods that were used to collect discharge information are discussed in the following sections.

3.2 Surveys
Survey questionnaires were issued in 1996 by the Navy to obtain information about vessel discharges and to provide a broad basis for subsequent technical efforts. As part of these surveys, a memorandum was distributed to the Navy’s technical community, including Navy fleet commands, subcommands, shore installations, and shipboard operators; other branches of the Armed Forces; and to all other organizations that are represented on the TWG. 1 

### The memorandum provided background on the UNDS development effort, an explanation of the UNDS scope and approach, and two enclosures. The first enclosure was a report entitled U.S. Navy Ship Wastewater Discharges
, 2 

### which provided those surveyed with findings from previous Navy-sponsored efforts on vessel wastewater identification, characterization, and quantification. The second enclosure was a survey entitled Equipment/System Discharge Stream Questionnaire

. 3 

### This questionnaire sought information about vessel discharges such as: system description, how3-2



### the discharge is generated and released (if applicable), time and location of the discharge, discharge volume, discharge constituents and their concentrations, contributing vessel classes and number of vessels, applicable regulations, currently employed control devices and/or management practices, and any reports or documentation available that were pertinent to the system or the discharge. Survey recipients were requested to review the report, provide comments on its contents, and respond to the questionnaire.
In addition to information from the surveys, information was also obtained during presampling “ship checks” (i.e., vessel inspections) and during other scheduled visits to vessels. During these checks and visits, additional information was often obtained by directly observing discharges and by talking with the ship’s crew.

3.3 Consultations with Department of Defense Personnel Having Equipment Expertise
The survey responses helped identify incidental vessel di scharges and their characteristics. However, the survey responses did not, in all cases, provide sufficient understanding of the discharges to make well-supported Phase I decisions. Therefore, the Navy and EPA met with vessel discharge experts from the government and the private sector (as consultants to the Navy), including engineers, field-activity representatives, and Navy laboratory personnel. The objective of these consultations was to obtain information that was not obtained from the survey responses, such as:

• system equipment design, operation, and maintenance practices;

• discharge volume and composition;

• the numbers and types of vessels producing the discharge; and

• existing engineering and environmental analysis reports for the discharge including available sampling data.
In addition, these meetings provided information beyond the scope of the surveys, such

as:

• potential MPCD options for controlling the discharge;

• ongoing research and development efforts; and

• information useful for assessing the practicability of implementing various MPCD options.
The information that was gathered during the numerous consultations on large-vessel systems (i.e., ships and submarines) was supplemented with information on discharges from small Navy watercraft during a meeting with the Navy’s small boat group in Norfolk, Virginia. Meetings were also held with Army representatives from the U.S. Army Tank-Automotive and Armaments Command (TACOM) in Warren, Michigan and from the 7 th 

### Transportation Group at Fort Eustis, VA to review Army watercraft systems, operations, and discharges.3-3



### After the survey responses and information obtained during ship checks were analyzed, DoD and EPA developed a list of 39 types of discharges incidental to the normal operation of Armed Forces vessels. These discharges are listed in Table 3-1.

Table 3-1. Incidental Discharges from Vessels of the Armed Forces

• Aqueous Film-Forming Foam

• Boiler Blowdown

• Catapult Water Brake Tank and PostLaunch Retraction Exhaust

• Catapult Wet Accumulator Discharge

• Cathodic Protection

• Chain Locker Effluent

• Clean Ballast

• Compensated Fuel Ballast

• Controllable Pitch Propeller Hydraulic Fluid

• Deck Runoff

• Dirty Ballast

• Distillation and Reverse Osmosis Brine

• Elevator Pit Effluent

• Gas Turbine Water Wash

• Graywater

• Hull Coating Leachate

• Firemain Systems

• Freshwater Lay-Up

• Mine Countermeasures Equipment Lubrication

• Motor Gasoline Compensating Discharge

• Non-Oily Machinery Wastewater • Photographic Laboratory Drains

• Portable Damage Control Drain Pump Discharge

• Portable Damage Control Drain Pump Wet Exhaust

• Refrigeration/Air Conditioning Condensate

• Rudder Bearing Lubrication

• Seawater Cooling Overboard Discharge

• Seawater Piping Biofouling Prevention

• Small Boat Engine Wet Exhaust

• Sonar Dome Discharge

• Steam Condensate

• Stern Tube Seals and Underwater Bearing Lubrication

• Submarine Acoustic Countermeasures Launcher Discharge

• Submarine Bilgewater

• Submarine Emergency Diesel Engine Wet Exhaust

• Submarine Outboard Equipment Grease and External Hydraulics

• Surface Vessel Bilgewater/Oil-Water Separator Discharge

• Underwater Ship Husbandry

• Welldeck Discharges

3.4 Consultation and Outreach Outside the Department of Defense
During Phase I of UNDS, DoD and EPA consulted with other interested Federal agencies, States, and environmental organizations. Other Federal agencies that have been involved in UNDS development include the Coast Guard for DOT; the Department of State; and the National Oceanic and Atmospheric Administration for the Department of Commerce. The Coast Guard has been involved in all aspects of UNDS development. The other agencies have participated with DoD, EPA, and the Coast Guard as members of the UNDS Executive Steering Committee3-4



### (ESC), which is responsible for UNDS policy development and is composed of senior-level managers. Separately, DoD and EPA provided an overview of the Phase I process and results to the U.S. Fish and Wildlife Service and the National Marine Fisheries Service.
Two mechanisms were used to consult with States. First, a representative from the Environmental Council of the States (ECOS) participates in UNDS ESC meetings. ECOS is the national association of State and territorial environmental commissioners and was established, in part, to provide State positions on environmental issues to EPA. Second, representatives from the Navy (as the lead for DoD), EPA, and the Coast Guard met at least once, and in most cases twice, with each State interested in UNDS development. The states agreeing to these meetings were predominantly those with significant numbers of Navy or Coast Guard vessels.

3.4.1 Initial State Consultation Meetings
In early 1996, the Navy and EPA invited States with a DoD or Coast Guard vessel presence to participate in an initial round of consultation meetings. Of the approximately 40 States invited, 21 requested a meeting. These initial State consultation meetings were held between August and December 1996. State environmental regulatory authorities hosted each meeting, which consisted of a Navy/EPA briefing on UNDS activities and an opportunity to discuss State-specific issues. A Coast Guard representative was present at each meeting to address discharges from Coast Guard vessels. The Navy/EPA briefing summarized the UNDS legislative history and requirements, considerations for evaluating discharges, the technical approach for determining which discharges require control, an overview of the vessels to which UNDS is applicable, and the roles of DoD and EPA in the rulemaking process. The States that participated in the first round of State meetings are listed in Table 3-2. The minutes from these meetings are compiled in the Uniform National Discharge Standards State Consultation Meetings (Round #1) Compendium of Minutes

. 4



### Table 3-2. States Involved in Initial Consultation Meetings

• Alaska • Illinois • Nevada

• California • Indiana • New York

• Connecticut • Kentucky • North Carolina

• Delaware • Louisiana • Rhode Island

• Florida • Maryland • South Carolina

• Georgia • Michigan • Virginia

• Hawaii • Mississippi • Washington

3.4.2 Second Round of State Con sultation Meetings
The Navy and EPA held a second round of State consultation meetings from October 1997 through January 1998. Of the 22 States consulted during the second round of meetings, five had not been briefed initially. The second round of consultation meetings provided Navy3-5



### and EPA an opportunity to summarize the activities that had taken place since the initial round of consultation meetings. This included discussing the 39 types of vessel discharges that were identified and the preliminary decisions regarding which of the discharges would be proposed to require control. States were given information on the equipment or process generating the discharges, the locations where the discharges occur, vessels producing the discharges, the preliminary results of environmental effects screenings, and the preliminary conclusions of whether MPCDs would be required. States were generally supportive of the UNDS effort. States most commonly expressed interest in matters related to the implementation of UNDS regulations, including enforcement and procedures for establishing no-discharge zones; the relationship between UNDS and other State programs; which vessels are subject to UNDS; and potential MPCD options. States that participated in the second round of consultation meetings are identified in Table 3-3. The minutes from these meetings are compiled in the Uniform National Discharge Standards State Consultation Meetings (Round #2) Compendium of Minutes

. 5



### Table 3-3. States Involved in the Second Round of Consultation Meetings

• Alaska • Louisiana • North Carolina

• California • Maryland • Oregon

• Connecticut • Massachusetts • Rhode Island

• Florida • Michigan • Texas

• Georgia • Mississippi • Virginia

• Hawaii • New Hampshire • Washington

• Indiana • New Jersey

• Kentucky • New York

Separately, city representatives from Portland, OR requested a briefing on UNDS activities. In February 1998, the Navy, EPA, and Coast Guard provided an overview of UNDS to city representatives. This meeting is summarized in the Uniform National Discharge Standards State Consultation Meetings (Round #2) Compendium of Minutes

. 5



### 3.4.3 Consultation with Environmental Organizations
In addition to State meetings, the Navy, EPA, and Coast Guard met with environmental organizations to provide an overview of UNDS and the preliminary results of the first phase of the UNDS regulatory development process. These meetings were held in December 1997 and May 1998 and are summarized in the Uniform National Discharge Standards State Consultation Meetings (Round #2) Compendium of Minutes

. 5



### 3.4.4 UNDS Newsletter and Homepage
To provide a continuous source of information on UNDS and as a way to receive information relative to UNDS, the Navy and EPA publish a newsletter and an Internet web site.3-6



### The newsletter contains feature articles on UNDS-related subjects (e.g., nonindigenous species, Navy research and development programs, etc.), provides answers to frequently asked questions, and provides an update on recent progress and upcoming events. The newsletter is mailed to State and environmental group representatives, Armed Forces and EPA contacts, and interested members of the general public. Approximately 360 newsletters are distributed, approximately 200 of which are distributed outside the EPA, DoD, and their contractor’s organizations. Electronic copies of the newsletter are available for downloading from the UNDS Internet site (http://206.5.146.100/n45/doc/unds/unds.html). In addition to providing an electronic version of the newsletter, the Internet site provides UNDS legislative information, a summary of the technical and management approach to used to develop the rule, and a description of the benefits expected to result from UNDS. Both the newsletter and the Internet site provide points of contact for obtaining information on UNDS.

3.5 Sampling and Analysis

3.5.1 Approach to Identifying Discharges Requiring Sampling
The available information for each discharge was evaluated to determine if additional data were necessary to adequately evaluate potential environmental effects. Sampling was not required for discharges where existing information was suff icient to characterize the nature of the discharge and to assess potential environmental impacts, if any. Nine of the 39 types of discharges required additional information and were sampled. 6,7 

### Table 3-4 lists these discharges.

Table 3-4. Discharges Sampled During Phase 1 of UNDS

• Boiler Blowdown

• Compensating Fuel Ballast

• Distillation and Reverse Osmosis Brine

• Firemain Systems

• Freshwater Lay-Up • Non-Oily Machinery Wastewater

• Seawater Cooling Overboard Discharge

• Steam Condensate

• Surface Vessel Bilgewater/Oil-Water Separator Discharge

3.5.2 Approach to Determining Analytes
To determine which constituents to analyze for in the nine sampled discharges, a comprehensive list of approximately 450 candidate analytes was considered, including the “priority pollutants” referenced in § 307(a) of the CWA. Analyses for constituents or analytical groups were not performed if it was evident that these constituents or groups could not be present based on process knowledge. A sampling rationale document was prepared to describe the reasons for excluding analytes from analysis on a discharge-by-discharge basis. 6,7 

### Table 3-5 shows the categories of analytes that were analyzed in each of the nine sampled discharges.3-7 

### Table 3-5. Type of Analysis According to Discharge

Discharge Classicals VOCs SVOCs Metals Pesticides PCBs Mercury Hydrazine

Boiler Blowdown x x x x x

Compensated Fuel Ballast x x x x x x

Distillation and Reverse Osmosis Brine x x x

Firemain Systems x x x x

Freshwater Lay-Up x x x x

Non-Oily Machinery Wastewater x x x x x x

Seawater Cooling Overboard Discharge x x x x

Steam Condensate x x x

Surface Vessel Bilgewater/ Oil Water Separator Discharge x x x x x x x x

Notes: x = constituents analyzed for, but not necessarily detected. Classicals: Includes analytes such as total dissolved solids (TDS) and total suspended solids (TSS), as well as other classical analytes listed in Table 3-8. PCBs: polychlorinated biphenyls VOCs: volatile organic compounds SVOCs: semi-volatile organic compounds



### 3.5.3 Shipboard Sampling
For the purpose of UNDS Phase I , samples were collected from ten vessels representing a total of six Navy, Coast Guard, and MSC vessel types. The Navy vessels that were sampled included an aircraft carrier, three surface combatants, two amphibious ships, and a submarine. A Coast Guard cutter and two MSC oilers, which are Naval Fleet Auxiliary Support Force vessels used for fuel transport, were also sampled. The discharges that were sampled on each vessel are presented in Table 3-6. The reasoning for sampling specific discharges on certain vessel classes is contained in the sampling rationale document. 6,7 

### In addition, the sampling procedures for eight of the ten vessels are presented in sampling and analysis plans (SSAP) prepared for each vessel. 8 -15 

### SSAPs were not prepared for the USS Mitscher or the USNS Big Horne because they3-8



### are the same class of vessel as the USS Arleigh Burke and the USNS Laramie , respectively. Therefore, the SSAPs for the USS Arleigh Burke and the USNS Laramie were used when sampling the USS Mitscher and the USNS Big Horne , respectively. The details of each sampling event are documented in a separate volume of the UNDS Phase I Sampling Episode Report, which contains the sampling analytical results and discusses any deviations from the SSAPs. 16 

### The laboratory methods used to analyze the samples are listed in Tables 3-7 and 3-8.

3.5.4 Quality Assurance/Quality Control and Data Validation Procedures
EPA-approved quality assurance/quality control (QA/QC) and data validation procedures were used throughout the sample collection and sample analysis activities during Phase I of UNDS. The field and analytical QA/QC procedures are described in detail in SSAPs 8-15 

### and the UNDS Phase I Sampling Episode Report

. 16 

### During sample collection in the field, trip and equipment blanks were collected as well as field duplicate samples. Analytical QA/QC included analysis of blanks, matrix spikes, and samples. The analyses followed the QA/QC requirements specified in the analytical methods listed in Tables 3-7 and 3-8.
In addition, the analytical results were validated according to standard EPA procedures. The purpose of the data validation was to detect and then verify any data values that may not reflect actual sample constituents and concentrations. The data validation step was conducted to identify data errors, biases, and outlying data so that such values would not be used when making Phase I decisions.3-9 

### Table 3-6. Discharges Sampled by Ship

Discharge

USS John C. Amphibious Assault Ship (LHD)
USS Wasp Cruiser

(CG)

USS Anzio Cutter

(WHEC)

USCG Dallas Dock Landing

Ship (LSD)

USS Oak Hill Attack

Submarine (SSN)

USS Scranton Oilers (T-AO)

USNS Laramie
USNS Big Horne Boiler Blowdown x x x x x Compensated Fuel Ballast x Distillation and Reverse Osmosis Brine x x x
Firemain Discharge x x x Freshwater Lay-Up x Non-Oily Machinery Wastewater x x x x
Seawater Cooling Overboard Discharge x x x x x x

Steam Condensate x x x x Surface Vessel Bilgewater / Oil-Water Separator Discharge x3-10 

### Table 3-7. Analytes and Analytical Methods

Target Analytes Analytical Method Classicals see Table 3-8
Volatile Organic Compounds (VOC) EPA Method 1624
Semi-Volatile Organic Compounds (SVOC) EPA Method 1625

Metals EPA Method 1620
Pesticides, Polychlorinated Biphenyls (PCBs) EPA Method 1656, 1657, 1658, 1660

Mercury EPA Method 1631
Hydrazine American Society for Testing and Materials (ASTM) D1385-88



### Table 3-8. Classical Analytes and Methods

Target Chemical/Analyte Analytical Method Ammonia as Nitrogen (NH 3 - N) EPA 350 Total Kjeldahl Nitrogen (TKN) EPA 351 Nitrate/Nitrite (NO 2 /NO 3 ) EPA 353 Total Phosphorus EPA 365 Total Suspended Solids (TSS) EPA 160.2 Biochemical Oxygen Demand (BOD 5 ) EPA 405.1 Total Organic Carbon (TOC) EPA 415.1 Chemical Oxygen Demand (COD) EPA 410.4 Total Dissolved Solids (TDS) EPA 160.1 Total Volatile Solids (TVS) EPA 160.4 Total Petroleum Hydrocarbons (TPH) EPA 1664 Oil and Grease EPA 1664/ modified EPA 418.2 Cyanide EPA 335 Chlorine DPD* 17 Alkalinity EPA 310 Sulfate EPA 375 Sulfide EPA 376 Chloride EPA 325.1 Notes: * DPD: N,N-diethyl-p-phenylene diamine



### 3.6 References

1. NAVSEA lette r 5090, Ser 00T/136. 1 July 1996. 2. Ships Environmental Support Office (SESO) Naval Surface Warfare Center Carderock Division. “U.S. Navy Ship Wastewater Discharges
, ” TM-63-95/08. 3 July 1995.3-11



### 3. NAVSEA. Equipment/System Discharge Stream Questionnaire

. 4. U.S. Navy/U.S. EPA. “Uniform National Discharge Standards (UNDS) State Consultation Meetings (Round #1) Compendium of Minutes.” 5. U.S. Navy/U.S. EPA. “Uniform National Discharge Standards (UNDS) State Consultation Meetings (Round #2) Compendium of Minutes.” 6. NAVSEA. “Uniform National Discharge Standards Rationale for Initial Discharge Sampling.” December 1997. 7. NAVSEA. Memorandum to File. Subject: Explanation of Deviations from the Phase I “Rationale for Discharge Sampling” Document. 21 July 1998. 8. NAVSEA. “Specific Sampling and Analysis Plan,” USS Stennis (CVN). July 1997. 9. NAVSEA. “Specific Sampling and Analysis Plan,” USS Arleigh Burke (DDG). July 1997. 10. NAVSEA. “Specific Sampling and Analysis Plan,” USS Anzio (CGN). July 19 97. 11. NAVSEA. “Specific Sampling and Analysis Plan,” USCG Dallas (WHEC). July 1997. 12. NAVSEA. “Specific Sampling and Analysis Plan,” USS Oak Hill (LSD). July 1997. 13. NAVSEA. “Specific Sampling and Analysis Plan,” USS Scranton (SSN). July 1997. 14. NAVSEA. “Specific Sampling and Analysis Plan,” USNS Laramie (T-AO). July 1997. 15. NAVSEA. “Specific Sampling and Analysis Plan,” USS Wasp (LHD). July 1997. 16. NAVSEA. “UNDS Phase 1 Sampling Episode Report,” Volumes 1-13. February 1998. 17. Amer ican Public Health Association, American Water Works Association, and the Water Pollution Control Federation. Standard Methods for the Examination of Water and Wastewater . Method 4500-Cl G. DPD Colorimetric Method. 17 th 

### Edition. Washington, DC: American Public Health Association. 1989.4-1 

### 4. DISCHARGE EVALUATION METHODOLOGY

4.1 Introduction
The information collected during Phase I from surveys, consultations, and from discharge sampling and analysis was used collectively to evaluate the discharges and to make Phase I decisions according to the seven factors listed in section 1.3. This chapter explains how Phase I decisions were made for the 39 discharge types listed in Table 3-1 (i.e., which discharges need to be controlled by MPCDs and which do not). Section 4.2 describes how the environmental effects screening of the discharges was conducted. Section 4.3 describes the Nature of Discharge (NOD) analysis and the contents of the NOD reports contained in Appendix A. Section 4.4 describes the MPCD practicability, operational feasibility, and cost analysis and the contents of the MPCD reports - also contained in Appendix A. Section 4.5 lists the chapter 4 references.

4.2 Environmental Effects Determination
EPA and DoD assessed the potential environmental effects of the discharges using a screening approach characterized by the following questions concerning their chemical, physical, and biological characteristics:

• Chemical Constituents

. Does the discharge contain constituents in concentrations that exceed State aquatic water quality criteria or Federal aquatic water quality criteria (as promulgated by EPA in the National Toxics Rule (NTR) 1 

### ) and have the potential to be released into the environment in significant amounts, resulting in a potential adverse impact on the environment?

• Thermal Pollution

. Does the discharge pose the potential to exceed State thermal water quality criteria in the receiving waters beyond a mixing zone, and to a degree sufficient to have an adverse impact on the environment?

• Bioaccumulative Chemicals of Concern

. Does the discharge have the potential to contain bioaccumulative chemicals of concern in amounts sufficient to have an adverse impact on the environment?

• Nonindigenous Species

. Does the discharge have the potential to introduce viable nonindigenous aquatic species to new locations?
If the answer to any of the above questions was “yes,” EPA and DoD determined that the discharge had a potential for adverse environmental effect. Each of these factors is discussed below.

4.2.1 Chemical Constituents
EPA and DoD used sampling results or process knowledge to identify the potential presence and concentrations of constituents in the discharge. Constituent concentrations in the discharge were compared to Federal aquatic water quality criteria promulgated by EPA in the National Toxic Rule (NTR) 1 

### and State aquatic water quality numeric criteria for the ten States4-2



### with the most significant presence of Armed Forces vessels. 2-11 

### These ten States are California, Connecticut, Florida, Georgia, Hawaii, Mississippi, New Jersey, Texas, Virginia, and Washington. Constituent concentrations in the discharge were compared against the most stringent of the Federal and ten States’ criteria for that constituent. For almost all constituents, the State aquatic water quality criteria are more stringent than the Federal NTR aquatic water quality criteria. EPA and DoD used aquatic water quality criteria in this assessment because they are a measure of the level of water quality that provides for the protection and propagation of aquatic life.
EPA and DoD used saltwater aquatic life criteria for screening the discharges because most Armed Forces vessels operate in the brackish water of estuaries or bays, or in the marine environment off the coast or in open ocean, where the biology of the waterbody is dominated by saltwater aquatic life. In addition, aquatic life criteria were used instead of human health criteria, which are related to consumption of fish and shellfish, because recreational activities such as fishing and swimming generally do not occur in the immediate vicinity of Armed Forces vessels.
Depending on the nature of the discharge, EPA and DoD compared discharge concentrations to either the acute or chronic aquatic water quality criteria values. Where discharges are intermittent or occasional in nature, of relatively short duration (a few seconds to a few hours), and dissipate rapidly in the environment, constituent concentrations were compared to acute aquatic water quality criteria. Where discharges are of a longer duration or continuous and likely to result in concentrations in the environment that approach a steady-state condition, the constituent concentrations were compared to chronic aquatic water quality criteria. Table 4-1 is a list of the most stringent saltwater-based aquatic water quality criteria for the constituents that were either detected in UNDS discharge samples or thought to be present based on engineering knowledge. It contains aquatic water quality criteria for both short-term (acute) and long-term (chronic) exposure published in Federal and State regulations.
Because metals may be present in the discharges in both dissolved and solid forms, the Federal criteria and many States’ criteria distinguish between dissolved and “total recoverable” forms. As issued by EPA or a particular State, an aquatic water quality criterion for the dissolved form of a metal is always less than or equal to the criterion for the “total recoverable” form. However, not all States issue criteria for both forms of metal. For metal constituents, the following method was used to compare concentrations in the discharge to aquatic water quality criteria:

• When the form of the metal was known (i.e., either “total recoverable” or

“dissolved”) as in the nine discharges that were sampled, as well as some of the nonsampled discharges, the measurement of “total recoverable” metal in the discharge was compared to “total recoverable” criteria, and the measurement of “dissolved” metal in the discharge was compared to “dissolved” criteria.

• When the form of the metal was unknown, the metal concentration was compared to the most stringent criteria, whether for “total recoverable” or “dissolved.”4-3 

### Table 4-1. Aquatic Life Water Quality Criteria

Constituent Name Most Stringent Acute Aquatic Life Water Quality Criterion Source of

Most Stringent Acute Criterion Most Stringent

Chronic Aquatic Life Water Quality Criterion Source of

Most Stringent Chronic Criterion

PRIORITY POLLUTANTS* ( μ g/L) ( μ g/L) Acenaphthene 320 HI

-------- Acenaphthylene 0.031 a FL 0.031 a FL Acrolein, 2-Propenal 18 HI 780 GA Anthracene 110,000 GA 110,000 GA Antimony 4,300 FL 4,300 FL Arsenic (Dissolved) 69 EPA, CA, HI, CT 36 EPA, CA, HI, CT Arsenic (Total) 36 GA, FL 36 GA, FL, WA, MS Benzene 71.28 FL, GA 71.28 FL, GA Benzidine 0.000535 GA 0.000535 GA Benzo(a)anthracene 0.031 a FL 0.031 a FL Benzo(a)pyrene 0.031 a FL 0.031 a FL Benzo(b)fluoranthene 0.031 a FL 0.031 a FL Benzo(g,h,i)perylene 0.031 a FL 0.031 a FL Benzo(k)fluoranthene 0.031 a FL 0.031 a FL Beryllium 0.13 FL 0.13 FL BHC, alpha- ** 0.0131 GA 0.0131 GA BHC, beta- ** 0.046 GA, FL 0.046 GA, FL BHC, gamma- \ Lindane ** 0.0625 GA 0.01 VA Bis(2-ethylhexyl) phthalate 5.92 GA 5.92 GA Cadmium (Dissolved) 42 EPA, CA, CT 9.3 EPA, CA, HI, VA, CT, MS Cadmium (Total) 9.3 GA, FL 8 WA Chromium (Dissolved) 1,100 EPA & 6 STATES 50 EPA & 6 STATES Chromium (Total) 50 GA, FL 50 WA, GA, FL Chrysene 0.031 a FL 0.031 a FL Copper (Dissolved) 2.4 EPA, CT, MS 2.4 EPA, CT, MS Copper (Total) 2.9 WA 2.9 GA. FL Cyanide 1 EPA & 9 STATES 1 EPA & 9 STATES Dibenzo(a,h)anthracene 0.031 FL 0.031 FL Diethyl phthalate 120,000 GA 120,000 GA Dimethyl phthalate 2,900,000 GA 2,900,000 GA Ethylbenzene 140 HI 28,718 GA Fluoranthene 13 HI 370 GA Fluorene 14,000 GA 14,000 GA Heptachlor 0.00021 FL 0.00021 FL Heptachlor epoxide 0.00011 GA 0.00011 GA Indeno(1,2,3-cd)pyrene 0.031 a FL 0.031 a FL Lead (Dissolved) 140 HI, TX 5.6 TX Lead (Total) 5.6 GA, FL 5.6 GA, FL Mercury ** (Dissolved) 1.8 EPA, CA, CT, MS 0.025 VA Mercury ** (Total) 0.025 GA, FL 0.025 EPA, WA, GA, CT, MS, FL4-4 

### Table 4-1. Aquatic Water Quality Criteria (contd.)

Constituent Name Most Stringent Acute Aquatic Life Water Quality Criterion Source of

Most Stringent Acute Criterion Most Stringent

Chronic Aquatic Life Water Quality Criterion Source of

Most Stringent Chronic Criterion
Naphthalene 780 HI

-------- Nickel (Dissolved) 74 EPA, CA, CT 8.2 EPA, CA, CT Nickel (Total) 8.3 GA, FL 7.9 WA Nitrophenol, 4- 1,600 HI

-------- Phenanthrene 0.031 a FL 0.031 a FL Phenol 170 HI 58 MS Pyrene 11,000 GA 11,000 GA Selenium (Dissolved) 290 EPA, CA, CT 71 EPA, CA, HI, VA, CT, MS Selenium (Total) 71 GA, FL 71 WA, GA, FL Silver (Dissolved) 1.9 EPA, CA, MS

-------- Silver (Total) 1.2 WA 1.2 WA Thallium 6.3 FL 6.3 FL Toluene 2,100 HI 200,000 GA Trichloroethane, 1,1,1- 10,400 HI

-------- Zinc (Dissolved) 90 EPA, CA, CT, MS 81 EPA, CA, MS Zinc (Total) 84.6 WA 76.6 WA NON-PRIORITY POLLUTANTS Chlorine (Chlorine Produced Oxidants) 10 FL 7.5 HI, WA, VA, CT, MS, NJ Oil & Grease 5,000 FL 5,000 FL Aluminum 1,500 FL 1,500 FL Ammonia as NH3*** 6 HI 6 HI Bromine 100 FL 100 FL Chloride 10% > ambient FL 10% > ambient FL

Iron 300 FL 300 FL Nitrate/Nitrite*** 8 HI 8 HI Phosphorus*** 25 HI 25 HI Total Nitrogen*** 200 HI 200 HI, Tributyltin 0.001 VA 0.001 VA Notes: * from 40 CFR 136.36 ** Denotes bioaccumulative chemicals of concern (40 FR 15366, Table 6A) *** Nutrient criteria are not specified as either acute or chronic and are, therefore, listed in both columns. a: Total of acenaphthylene benzo(a)anthrancene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(g,h,i)perylene, benzo(k)fluoranthene chrysene, dibenz(a,h)anthracene, indeno(1,2,3-c,d)pyrene, and phenanthrene.4-5



### The initial screening process involved comparing the constituent concentrations in the undiluted discharge to the aquatic water quality criteria. For those discharges, such as cathodic protection, where the constituents diffuse from the exterior of a vessel or vessel component, EPA and DoD generally computed a concentration within a small mixing zone (a few inches to a few feet).
EPA and DoD further assessed those discharges that had constituents exceeding aquatic water quality criteria. EPA and DoD considered mass loadings, flow rates, the geographic location of the discharge, the manner in which the discharge occurs (e.g., continuous or intermittent), and in some cases, the effect of the dilution within a small mixing zone. The purpose of this further assessment was to determine whether the constituents are discharged with such a low frequency or in such small amounts that the resulting constituent mass loading has the potential to produce only minor or undetectable environmental effects, or whether the constituents are released in such a manner that dilution in a small mixing zone quickly results in concentrations below aquatic water quality criteria. If so, EPA and DoD considered the chemical constituents of the discharge not to have the potential to adversely affect the environment.

4.2.2 Thermal Pollution

In addition to chemical constituents, EPA and Do D assessed whether the discharges exceeded State thermal water quality criteria for the five States with the most significant presence of Armed Forces vessels (California, Florida, Hawaii, Virginia, and Washington). A screening study was performed on these discharges to quantify these potential effects. 12 

### Many discharges did not need a detailed assessment because they are discharged at ambient or only slightly elevated temperatures, or the volume or discharge rate is very low. EPA and DoD determined that six discharges are released at sufficiently high temperatures and volumes that further assessment was warranted to determine whether the discharge had the potential to cause an adverse thermal effect. These discharges are:

• Boiler Blowdown;

• Catapult Water Brake Tank and Post-Launch Retraction Exhaust;

• Catapult Wet Accumulator Discharge;

• Distillation And Reverse Osmosis Brine;

• Seawater Cooling Overboard Discharge; and

• Steam Condensate.
EPA and DoD modeled these discharges to determine the size of the mixing zone that would be needed for receiving waters to meet State thermal water quality criteria and compared this zone to State thermal mixing zone allowances. Small boat engine wet exhaust, firemain systems, portable damage control drain pump wet exhaust, and submarine emergency diesel engine wet exhaust discharges also have elevated temperatures above ambient when released. These discharges generally have minimal temperature differences between the influent and effluent streams, are released in small volumes, and generally occur only while the vessel is moving, which distributes the heat load over a wide area. Submarine emergency diesel engine wet exhaust is released into the air as a mist and cools before contacting the water. The overall4-6



### thermal impact from these discharges is minimal; thus, they were not included in the thermal effects study.
Two screening protocols were used to evaluate thermal discharges. For discharges that can be continuous such as steam condensate, seawater cooling overboard discharge, and distillation and reverse osmosis brine, the Cornell Mixing Zone Expert System (CORMIX, Version 3.2) was used to estimate the plume size and temperature gradients in the receiving waterbody for comparison to mixing zone requirements for States with major naval ports. CORMIX is a software model used to analyze and predict aqueous pollutant discharges into water bodies. The output from CORMIX provides the shape and size of the thermal plume along with temperature contours that can then be compared to various thermal criteria. However, CORMIX has several limitations when modeling this discharge, including modeling the effect of tidal action and turbulent mixing beyond the plunge zone (i.e., area of initial mixing from a discharge above the waterline) on the discharge plume. Therefore, a dditional modeling was performed using a hydrodynamic transport model, CH3D, to evaluate steam condensate because CH3D simulates the mixing of the buoyant plume with ambient and tidal flows by advection and turbulent mixing both horizontally and vertically in the water column. 13



### For discharges that can be intermittent, short-duration, or batch (boiler blowdown, catapult water brake tank and post-launch retraction exhaust, and catapult wet accumulator blowdown), thermodynamic equations were used to estimate the temperature effects because CORMIX and CH3D were designed primarily for continuous, steady-state discharges. Batch discharges of high-temperature water require a different screening approach than continuous discharges because these discharges are not steady-state and are generally small. The steps used to estimate the maximum size of the impact zone for a given acceptable plume temperature included:

• calculating the total heat and water mass released;

• calculating the volume of water needed to dilute this mass of water such that the acceptable mixed temperature is obtained; and

• determining the region around the release point assuming complete vertical mixing that will provide the required volume.

4.2.3 Bioaccumulative Chemicals of Concern
EPA and DoD reviewed each discharge to determine whether it contained bioaccumulative chemicals of concern, as identified in the Final Water Quality Guidance for the Great Lakes System. 14 

### This guidance contains a list of bioaccumulative chemicals of concern identified after scientific study, in a process subjected to public notice and comment, designed to support a regionally uniform set of standards applicable to the waters of the Great Lakes. Table 4-2 lists these bioaccumulative chemicals of concern. In every case where the presence of a bioaccumulative chemical of concern was confirmed in a discharge, EPA and DoD had already4-7



### determined based on other information that it was reasonable and practicable to require control of that discharge.

4.2.4 Nonindigenous Species
EPA and DoD also assessed each discharge for its potential to transport viable living aquatic organisms between naturally isolated water bodies. Preventing the introduction of invasive nonindigenous aquatic species has been recognized as important in maintaining

Table 4-2. List of Bioaccumulative Chemicals of Concern 14



### • BHC, alpha-

• BHC, beta-

• BHC, delta-

• BHC, gamma- \Lindane

• Chlordane

• DDD

• DDE

• DDT

• Dieldrin

• Hexachlorobenzene

• Hexachlorobutadiene

• Mercury

• Mirex/Dechlorane • PCB-1016

• PCB-1221

• PCB-1232

• PCB-1242

• PCB-1248

• PCB-1254

• PCB-1260

• Pentachlorobenzene

• 1,2,4,5-Tetrachlorobenzene

• 2,3,7,8-Tetrachlorodibenzo- p-dioxin

• Toxaphene

Notes: BHCs are chlorinated cyclohexanes DDD and DDE are metabolites of DDT DDT is dichlorodiphenyl trichloroethane PCBs are polychlorinated biphenyls


### biodiversity, water quality, and the designated uses of water bodies. If the available data indicate that a discharge has a potential for transporting and then subsequently discharging viable aquatic organisms into waters of the U.S., then EPA and DoD considered the discharge to present a potential for causing adverse environmental effects from nonindigenous species.

4.2.5 D ischarge Evaluation
In some cases, EPA and DoD determined it was reasonable and practicable to require MPCDs to control a discharge even though available information indicates that the discharge has a low potential for adversely affecting the environment. For the Chain Locker Effluent and Sonar Dome discharges, at least one class of Armed Forces vessel has a management practice or control technology already in place to control the environmental effects of the discharge. EPA and DoD considered the existence of a currently applied management practice or control technology to be sufficient indication that it was reasonable and practicable to require a MPCD. In other cases (Non-Oily Machinery Wastewater and Photographic Laboratory Drains), analysis4-8



### of whether the discharge had a potential to adversely affect the environment was inconclusive. However, EPA and DoD determined that it was reasonable and practicable to require a MPCD to mitigate possible adverse environmental effects from the discharge.

For ea ch discharge that was determined to have the potential to adversely affect the environment, EPA and DoD conducted an initial evaluation of the practicability, operational impact, and economic cost of using a MPCD to control each discharge. EPA and DoD first determined whether a control technology or management practice is currently in place to control the discharge for environmental protection on any vessel type. The use of existing controls on a vessel was considered sufficient demonstration that at least one reasonable and practicable control is available for at least one vessel type. The Phase I UNDS rule does not address whether existing control technologies or management practices are adequate to mitigate potential adverse impacts. In Phase II of UNDS, EPA and DoD will promulgate MPCD performance standards for the discharges requiring control. For discharges without any existing pollution controls, EPA and DoD analyzed potential pollution control options to determine whether it is reasonable and practicable to require the use of MPCDs. For every discharge that was found to have a potential to cause adverse environmental effects, EPA and DoD determined that it is reasonable and practicable to require a MPCD for at least one vessel type. The results of the MPCD assessments are presented in Appendix A.

4.3 Nature of Discharge Analysis
The nature of the discharge was analyzed for each of the 39 discharges incidental to the operations of Armed Forces vessels (Table 3-1), and based on this analysis, a NOD report was prepared that describes the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. T he NOD report summarizes the results of additional sampling or other data gathered on the discharge. Based on this information, the NOD report describes how the estimated constituent concentrations and mass loadings in the environment were determined. The constituent concentrations are compared to applicable Federal and State water quality criteria. In addition to comparing discharge concentrations to Federal and State water quality criteria, other U.S. laws and international standards were also evaluated, including the standards for oil established by the International Convention for the Prevention of Pollution from Ships (MARPOL) (73/78) as implemented by the Act to Prevent Pollution from Ships, and the oil spill regulations at 40 CFR Part 110. Where Federal law and international standards were relevant to a discharge, the law and standards are discussed in the NOD reports contained in Appendix A.
In addition, known bioaccumulative chemicals of concern are identified, possible thermal effects are discussed (if applicable) and the potential for introducing nonindigenous aquatic species is assessed. The NOD report also discusses the potential for the discharge to cause adverse environmental effects.4-9



### 4.3.1 Nature of Discharge Report Contents
NOD reports are divided into six sections, the outline of which is presented below:

Section 1.0 -- Introduction Provides a brief description of the basic objectives of the NOD analysis. This section is identical for each of the reports.
Section 2.0 – Discharge Description

2.1 Equipment Description and Operation – this section describes the equipment and ship operations that generate the discharge. It includes any pertinent figures and schematics that assist in explaining the origin of the discharge.

2.2 Releases to the Environment – this section describes the actual discharge released to the environment. The section also describes how the discharge is released, such as whether the flow is a stream, a mist, or results from direct contact with surrounding waters.

2.3 Vessels Producing the Discharge – this section describes which Armed Forces vessels produce the discharge.
Section 3.0 -- Discharge Characteristics

3.1 Locality – this section describes whether the discharge occurs within 12 n.m. from shore.

3.2 Rate – this section presents the estimated flow rate of the discharge. This rate can be a distinct flow in the case of liquid discharges, or a release rate in the case of constituents that corrode, erode, or dissolve into the environment.

3.3 Constituents – this section identifies the constituents in the discharge, including thermal pollution, when applicable. Included in this section is an identification of those pollutants known to be particularly detrimental to environmental quality. Section 3.3 includes the following:

• a list of all constituents identified in the discharge;

• identification of priority pollutants; and

• identification of bioaccumulative chemicals of concern.

3.4 Concentrations – this section presents the concentrations of the constituents in the discharge. When possible, this is estimated from an analysis of the existing data or alternatively, from process knowledge of the system that produces the discharge. When sampling was conducted, results of the sample analyses are presented.
Section 4.0 - Nature of Discharge Analysis

4.1 Mass Loadings -- in this section, the flow rate and the concentrations presented in section 3.0 are used to calculate an estimated annual mass loading on a fleet-wide basis.

4.2 Environmental Concentrations – this section varies with each analysis, but includes a comparison of the concentrations (from section 3.4) with the Federal aquatic water quality criteria and aquatic water quality criteria for selected States. Where appropriate, this section presents estimates of the concentrations after dilution in the environment. Any mixing zone calculations are clearly explained and assumptions are4-10

listed. Pertinent figures from any analysis are included to support statements regarding the results of the analysis.

4.3 Potential for Introducing Nonindigenous Species – this section describes an evaluation of the potential for the discharge to transport and introduce nonindigenous aquatic species.

Section 5.0 -- Conclusion Provides a summary of the assessment of the potential for the discharge to cause an adverse environmental effect based on information presented in the report.
Section 6.0 -- Data Sources and References This section contains a table that indicates the type and source of information presented in each section of the analysis. The section also lists the references cited in the report.



### 4.3.2 Peer Review
Peer review is a documented critical review of a scientific and technical work product. It is an in-depth assessment that is used to ensure that the final work product is technically sound. Peer reviews are conducted by qualified individuals who are independent of those who prepared the work product. For the Phase I rule, reviewers were selected because of their technical expertise in assessing pollutant behavior in coastal and estuarine ecosystems, modeling pollutant concentrations, and predicting the effects of pollutant loadings on ambient water quality, sediments, and biota.
NOD reports for five discharges were selected for pe er review. For each of these discharges, EPA and DoD determined that it is not reasonable and practicable to require the use of MPCDs because they exhibit a low potential for causing adverse impacts on the marine environment. Peer reviewers were asked whether the data and process information presented in the NOD reports are sufficient to characterize the discharges; whether the analyses are appropriate for the discharges; and whether the conclusions regarding the discharges’ potential for causing adverse environmental impacts are supported by the information presented in the NOD reports. Peer review comments are compiled in a separate report. 15



### EPA and DoD reviewed the peer review comments and determined that the comments did not indicate any fundamental flaws in the methodology used to assess a discharge's potential to cause adverse impacts on the marine environment. EPA and DoD resolution of peer review comments are compiled in Uniform National Discharge Standards For Vessels Of The Armed Forces Peer Review Comment Response. 164-11



### 4.4 MPCD Practicability, Operational Feasibility, and Cost Analysis
If a discharge was determined to have a potential to cause an adverse environmental impact in the absence of pollution controls, EPA and DoD evaluated the practicability, operational impact, and economic cost of using a MPCD to control the discharge. First, EPA and DoD determined whether a control technology or management practice is currently in place to control the discharge for environmental protection on any vessel type. The use of existing controls was considered sufficient demonstration that at least one practicable control is available. The Phase I UNDS rule does not address whether existing control technologies or management practices are adequate to mitigate potential adverse impacts. In Phase II of UNDS, EPA and DoD will promulgate MPCD performance standards for the discharges requiring control. For discharges without any existing pollution controls but having the potential to cause an adverse environmental impact, EPA and DoD analyzed potential pollution control options to determine whether it is reasonable and practicable to require the use of MPCDs. Practicability analyses were prepared for the following four discharges (these analyses are contained in Appendix A):

• Distillation and Reverse Osmosis Brine;

• Hull Coating Leachate;

• Small Boat Engine Wet Exhaust; and

• Underwater Ship Husbandry.
For every discharge that showed a potential to cause adverse environmental effects, EPA and DoD determined that it is reasonable and practicable to require a MPCD.

4.4.1 MPCD Practicability, Operational Feasibility, and Cost Report Contents
Each MPCD report gives a brief description of the discharge, lists and describes the MPCD options, and reports the results of analyzing each MPCD option according to practicability, operational impact, cost, and environmental effectiveness. The contents of the MPCD reports are briefly described below:

Analysis of Practicability, Operational Impact, and Cost of Selected MPCD Options This section describes the purpose of the MPCD analysis and discusses the factors that are considered when determining which discharges should be controlled by MPCDs.

1.0 MPCD Options This section describes the discharge and how it is generated and lists each of the MPCD options considered.
2.0 MPCD Analysis Results This section presents the results of the MPCD analysis including discussions on practicability, effect on operational and warfighting capabilities, cost, environmental effectiveness, and a determination for each MPCD option. It recommends one or more MPCD options for further consideration under Phase II of UNDS.4-12



### 4.5 References

1. USEPA. “Water Quality Standards.” 40 CFR Part 131.36. The following Federal Register notices addressed the National Toxic Rule that is promulgated at 40 CFR Part 131.36: “Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants,” 57 FR 60848, 22 December 1992, and “Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria,” 60 FR 22230, 4 May 1995. 2. State of Florida. “Florida Department of Environmental Protection. Surface Water Quality Standards,” Chapter 62-302. Effective 26 December 1996. 3. State of Georgia. Georgia Final Regulations. “Water Quality Control,” Chapter 391-3-6 as provided by The Bureau of National Affairs, Inc. 1996. 4. State of Connecticut. Connecticut Department of Environmental Protection. “Surface Water Quality Standards,” Effective 8 April 1997. 5. State of Mississippi. Mississippi Department of Environmental Quality, Office of Pollution Control. “Water Quality Criteria for Intrastate, Interstate and Coastal Waters.” Adopted 16 November 1995. 6. State of Texas. Texas Natural Resource Conservation Commission. “Texas Surface Water Quality Standards.” 307.2 - 307.10. Effective 13 July 1995. 7. State of New Jersey. New Jersey Final Regulations. “Surface Water Quality Standards.” Section 7:9B-1, as provided by The Bureau of National Affairs, Inc. 1996. 8. USEPA. “Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California,” Proposed Rule under 40 CFR Part 131, Federal Register, Vol. .62, Number 150. 5 August 1997. 9. State of Hawaii. “Water Quality Standards.” Chapter 54, Section 11-54. 10. State of Washington. “Water Quality Standards for Surface Waters of the State of Washington.” Chapter 173-201A. Washington Administrative Code. 11. S tate of Virginia. “Water Quality Standards.” Chapter 260. Virginia Administrative Code VA 9; VAC 25-260. 12. NAVSEA. “Thermal Effects Screening of Discharges From Vessels of the Armed Forces.” July 1997. 13. USNavy/USEPA. “Supplement to Thermal Effe cts Screening of Discharges from Vessels of the Armed Forces.” 14. USEPA. Table 6A of the “Water Quality Guidance for the Great Lakes System.” 60 FR 15365. 23 March 1995. 15. USEPA. “Peer Review Comments Document, Nature of Discharge Reports for Unifor m National Discharge Standards.” Contract No. 68-C7-0002, Work Assignment No. 1-50. 1 July 1998. 16. USNavy/USEPA. “Uniform National Discharge Standards For Vessels Of The Armed Forces Peer Review Comment Response.” 1 March 1999.5- 1 

### 5. PHASE I DISCHARGE DETERMINATIONS

This chapter summarizes the 39 discharge types listed in Table 3-1 and the UNDS Phase I decisions made regarding whether MPCDs are required. Section 5.1 provides this information for the discharges that EPA and DoD determined to require MPCDs; section 5.2 provides information for the discharges determined not to require MPCDs; and section 5.3 lists the chapter 5 references.

5.1 Discharges Determined To Require MPCDs

For the reasons discussed below, EPA and DoD have determined that it is rea sonable and practicable to require the use of a MPCD to control 25 types of discharges from vessels of the Armed Forces. Except where noted, the pollutant characteristics of these discharges indicate a potential to cause adverse environmental impacts. Table 5-1 lists those discharges for which EPA and DoD determined it was reasonable and practicable to require the use of an MCPD, and identifies the characteristics of each discharge that formed the basis of the determination.

For the Phase I rule, EPA and DoD identified at least one potential MPCD control option for each discharge that could mitigate the environmental impacts of the discharge from at least one class of Armed Forces vessel. In Phase II of the UNDS rulemaking, EPA and DoD will perform a more detailed assessment of MPCD control options. EPA and DoD will consider options that are being evaluated as part of research and development programs in addition to those that are currently available. EPA and DoD will evaluate MPCDs for all classes of vessels and promulgate the specific performance standards for each MPCD that are reasonable and practicable for that class of vessel. In developing specific MPCD performance standards, EPA and DoD will consider the same factors considered in Phase I. The Phase II rule may distinguish among vessel types and sizes, between new and existing vessels, and may waive the applicability of Phase II standards as necessary or appropriate to a particular type or age of vessel (see CWA section 312(n)(3)(B)).

A MPCD i s a control technology or a management practice that can reasonably and practicably be installed or otherwise used on a vessel of the Armed Forces to receive, retain, treat, control or discharge a discharge incidental to the normal operation of the vessel.
The discussions below provide a brief description of the discharges and the systems that produce the discharges EPA and DoD propose to control. The discussions highlight the most significant constituents released to the environment, and describes the current practice, if any, to prevent or minimize environmental effects. Because of the diversity of vessel types and designs, these control practices are usually not uniformly applied to all vessels generating the discharge. In addition, these controls do not necessarily represent the only control options available. A more detailed discussion of the discharges is presented in the NOD reports in Appendix A.5- 2



### Table 5-1. Discharges Requiring the Use of a MPCD and the Basis for the Determination a

Chemical Constituents

Discharge Oil Metals Organic Chemicals Thermal

Pollution Bioaccumulative Chemicals of Concern Nonindigenous

Species Other

Aqueous Film-Forming Foam (b) Catapult Water Brake Tank Discharge and Post-Launch Retraction Exhaust X

Chain Locker Effluent (c) Clean Ballast X Compensated Fuel Ballast X Controllable Pitch Propeller Hydraulic Fluid X

Deck Runoff X Dirty Ballast X Distillation and Reverse Osmosis Brine X

Elevator Pit Overboard Discharge X

Firemain Systems X Gas Turbine Washdown Discharge X X

Graywater X Hull Coating Leachate X Motor Gasoline Compensating Overboard Discharge X X

Non-Oily Machinery Wastewater (d)

Photographic Laboratory Drains (d)

Seawater Cooling Overboard Discharge X X

Seawater Piping Biofouling Prevention (e)

Small Boat Engine Wet Exhaust X

Sonar Dome Discharge (c) Submarine Bilge Water X Surface Vessel Bilge Water/Oil-Water Separator Discharge X

Underwater Ship Husbandry X X Welldeck Discharges X5- 3

Notes: (a) This table provides a simplified overview of the basis for requiring the use of MPCDs for particular discharges. It is not intended to fully characterize the discharges or describe the analyses leading to the decision. More complete characterizations of the discharges and the analyses leading to the decisions are presented in this section and in Appendix A. (b) Discharge may produce f loating foam in violation of some State water quality standards. (c) Discharge was determined to have a low potential to adversely affect the environment, but an existing MPCD is in place on at least one type of vessel to reduce this low potential even further. (d) No conclusion was drawn on the potential of the discharge to adversely affect the environment, but EPA and DoD determined a MPCD is reasonable and practicable to mitigate any possible adverse effects. (e) Chlorine and chlorination byproducts.



### 5.1.1 Aqueous Film-Forming Foam (AFFF)
This discharge consists of a mixture of seawater and firefighting foam discharged during training, testing, and maintenance operations. Aqueous film forming foam (AFFF) is the primary firefighting agent used to extinguish flammable liquid fires on surface ships of the Armed Forces. AFFF is stored on vessels as a concentrated liquid that is mixed with seawater to create the diluted solution (3-6% AFFF) that is sprayed as a foam on the fire. The solution is applied with both fire hoses and fixed sprinkler devices. During planned maintenance of firefighting systems, system testing and inspections, and flight deck certifications, the seawater/foam solution is discharged either directly overboard from hoses, or onto flight decks and then subsequently washed overboard. These discharges are considered incidental to the normal operation of Armed Forces vessels. Discharges of AFFF that occur during firefighting or other shipboard emergency situations are not incidental to normal operations and are not subject to the requirements of the rule.
AFFF is discharged from all Navy ships, those MSC ships capable of supporting helicopter operations, and Coast Guard cutters, icebreakers, and tugs. AFFF discharges generally occur at distances greater than 12 n.m. from shore, and in all cases more than 3 n.m. from shore due to existing Armed Forces operating instructions. The constituents of AFFF include water, 2- (2-butoxyethoxy)-ethanol, urea, alkyl sulfate salts, amphoteric fluoroalkylamide derivative, perfluoroalkyl sulfonate salts, triethanolamine, and methyl-1H-benzotriazole. Because the water used to mix with the AFFF concentrate comes from the vessel’s firemain, the discharge will also include bis(2-ethylhexyl)phthalate, nitrogen (measured as total Kjeldahl nitrogen), copper, nickel, and iron from the firemain piping.
The AFFF discharge produces an aqueous foam intended to cool and smother fires. Water quality criteria for some States include narrative requirements for waters to be free of floating materials attributable to domestic, industrial, or other controllable sources, or include narrative criteria prohibiting discharges of foam. AFFF discharges in State waters would be expected to result in violating such narrative criteria for foam or floating materials. At present, the Navy uses certain management practices to control these discharges, including a self-imposed prohibition on AFFF discharges in coastal waters by most Armed Forces vessels. These management practices to control discharges of AFFF demonstrate the availability of a MPCD to mitigate the5- 4



### potential adverse impacts that could result from the discharge of AFFF. Therefore, EPA and DoD have determined that it is reasonable and practicable to require use of a MPCD for this discharge.
AFFF discharges occur beyond 3 n.m. but within 12 n.m. from shore infrequently and in relatively small volumes, and preliminary investigation indicates that the diluted (3-6%) AFFF solution does not exhibit significant toxic effects. Further, any discharges that do occur take place while the vessel is underway and will be dispersed in the turbulence of the vessel wake.

5.1.2 Catapult Water Brake Tank and Post-Launch Retraction Exhaust
This intermittent discharge is the oily water skimmed from the catapult water brake tank, and the condensed steam discharged when the catapult is retracted. Catapult water brakes are used to stop the forward movement of the steam-propelled catapults used to launch aircraft from Navy aircraft carriers. The catapult water brake system includes water brake cylinders and a water brake tank that contains freshwater. During flight operations, water from the catapult water brake tank is continuously injected into the catapult water brake cylinders. At the end of a launch stroke, spears located on the front of the catapult pistons enter the water brake cylinders. The water in the cylinders builds pressure ahead of the spears, cushioning the catapult pistons to a stop. The catapult brake water is continuously circulated between the catapult water brake tank and the catapult water brake cylinders.
Prior to the launch stroke, lubricating oil is applied to the catapult cylinder through which the catapult piston and piston spear are driven. As the catapult piston is driven forward during the launch stroke, the catapult piston and spear carries lubricating oil from the catapult cylinder into the water brake cylinder at the end of the stroke. Over the course of multiple launchings, the oil and water circulating through the water brake cylinder and tank leads to the formation of an oil layer in the water brake tank. The oil layer can adversely affect water brake operation by interfering with the cooling of water in the water brake tank. To prevent excessive heat buildup in the tank, the oil is periodically skimmed off and discharged overboard. Additionally, as the catapult piston is retracted following the launch, expended steam from the catapult launch stroke and some residual lubricating oil from the catapult cylinder walls are discharged below the waterline through a separate exhaust pipe.
Only aircraft carriers generate this discharge. Catapult operations during normal flight operations generate both the water brake tank discharge and the post-launch retraction exhaust; however, flight operations take place beyond 12 n.m. from shore. Catapult testing which occurs within 12 n.m. always discharges the post-launch retraction exhaust, but usually does not add sufficient quantities of oil to the water brake tank to require skimming.
The water brake tank is used within 12 n.m. for dead-load catapult shots when testing catapults on new aircraft carriers, and following major drydock overhauls or major catapult modifications. This testing requires a minimum of 60 dead-load shots each and may occur over a period of several days within 12 n.m. from shore. New carrier testing occurs only once, and major overhauls generally occur on 5- to 7-year cycles in conjunction with drydocking. Major5- 5



### modifications to catapults may occur during an overhaul or pierside and are also infrequent events. Carriers also routinely perform no-load shots when leaving port. The number of no-load shots conducted when leaving port, however, usually do not add enough lubricating oil to the water brake tank to require skimming the oil while the ship is within 12 n.m. from shore.
The Water Brake Tank and Post-Launch Retraction exhaust discharge includes lubricating oil, a limited thermal load associated with the heated oil and water (or condensed steam, in the case of the post-launch retraction exhaust), nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen), and metals such as copper and nickel from the piping systems. EPA and DoD analyzed the thermal effects of this discharge and concluded they were unlikely to exceed thermal mixing zone criteria in the States where aircraft carriers most frequently operate. The post-launch retraction exhaust discharge can contain oil, copper, nickel, ammonia, bis(2-ethylhexyl)phthalate, phosphorus, and benzidine in concentrations exceeding State acute water quality criteria. The post-launch retraction exhaust discharge can also contain nitrogen in concentrations exceeding the most stringent State water quality criteria.
The Navy has imposed operational controls limiting the amount of oil applied to the catapult cylinder during the launch stroke, which directly affects the amount of oil that is subsequently discharged from the water brake tank or during the post-launch retraction exhaust. The Navy has also established requirements prescribing when catapult testing is required within 12 n.m. from shore. These operational constraints minimize discharges of oil from the water brake tank and post-launch retraction exhaust in coastal waters. These existing management practices demonstrate the availability of controls for this discharge. Therefore, EPA and DoD have determined that it is reasonable and practicable to require use of a MPCD to mitigate potential adverse environmental impacts from this discharge.

5.1.3 Chain Locker Effluent
This discharge consists of accumulated precipitation and seawater that is occasionally emptied from the compartment used to store the vessel’s anchor chain.
The chain locker is a comp artment used to store anchor chain aboard vessels. Navy policy requires that the anchor chain, appendages, and anchor on Navy surface vessels be washed down with seawater during retrieval to prevent onboard accumulation of sediment. During washdown, some water adheres to the chain and is brought into the chain locker as the chain is stored. The chain locker sump accumulates the residual water and debris that drains from the chain following anchor chain washdown and retrieval, or washes into the chain locker during heavy weather. Water accumulating in the chain locker sump is removed by a drainage eductor powered by the shipboard firemain system.
All Armed Forces vessels housing their anchor chains in lockers, except submarines, can generate this discharge. Since submarine chain lockers are always open to the sea, water is always present in the chain locker and there is no “collected” water to be discharged as effluent. Navy policy prohibits discharging chain locker effluent within 12 n.m. Other vessels of the Armed Forces are currently authorized to discharge chain locker effluent within 12 n.m.;5- 6



### however, most Armed Forces vessels also observe the 12 n.m. discharge prohibition. A recent review of practices on several Navy ships found no water accumulation in the chain locker sump, and the ships’ crew confirmed that discharges of chain locker effluent occur outside 12 n.m.
In addition to water, materials collecting in the chain locker sump can include paint chips, rust, grease, and other debris. Chain locker effluent may contain organic and inorganic compounds associated with this debris, as well as metals from the sump and from sacrificial anodes installed in the chain locker to provide cathodic protection. If the anchor chain washdown is not performed and the chain locker effluent is subsequently discharged in a different port, the discharge could potentially transport nonindigenous species. Discharge volume will vary depending upon the frequency of anchoring operations, the number of anchors used, and the depth of water (which determines the amount of chain that will be lowered into the water).
Given the manner in which water collects in the chain locker sump and remains there for extended periods of time, it is possible that the discharge could contain elevated levels of metals at concentrations exceeding State water quality criteria. However, given the small volume of the discharge and the infrequency of anchoring operations, it is unlikely that discharges of chain locker effluent would adversely impact the environment. Nevertheless, the Navy and other Armed Forces already have management practices in place for most vessels requiring anchors and anchor chains to be washed down with seawater during retrieval, and prohibiting the discharge of chain locker effluent until beyond 12 n.m. from shore. DoD has chosen as a matter of policy to continue prohibiting the discharge of chain locker effluent within 12 n.m. from shore. This prohibition, while not considered necessary to mitigate an existing or potential adverse impact, will eliminate the possibility of discharging into coastal waters any metals, other contaminants, or nonindigenous aquatic species that may have accumulated in the chain locker sump. EPA and DoD have determined that the existing management practices demonstrate that it is reasonable and practicable to require use of a MPCD for chain locker effluent.

5.1.4 Clean Ballast
This discharge is composed of the seawater taken into, and discharged from, dedicated ballast tanks used to maintain the stability of the vessel and to adjust the buoyancy of submarines.
Many types of Armed Forces vessels store clean ballast in dedicated tanks in order to adjust a vessel’s draft, buoyancy, trim, and list. Clean ballast may consist of seawater taken directly onboard into the ballast tanks or seawater received from the vessel’s firemain system. Clean ballast differs from “dirty ballast” and “compensated ballast” discharges (described below) in that clean ballast is not stored in tanks that are also used to hold fuel. Many surface vessels introduce clean ballast into tanks to replace the weight of off-loaded cargo or expended fuel to improve vessel stability while navigating on the high seas. Amphibious ships also flood clean ballast tanks during landing craft operations to lower the ship’s stern, allowing the well deck to be accessed. Submarines introduce clean ballast into their main ballast tanks when submerging, and introduce clean ballast into their variable ballast tanks to make minor adjustments to5- 7



### buoyancy, trim, and list while operating submerged or surfaced. The discharge occurs when fuel or cargo is taken on and the ballast is no longer needed, when amphibious operations are concluded and the vessel is returned to its normal operating draft, when submarines surface, or when submarines make some operational adjustments in trim or list while submerged or surfaced.
Clean ballast discharges are intermittent and can occur at any distance from shore, including within 12 n.m. Constituents of clean ballast can include materials from tank coatings (e.g., epoxy), chemical additives (e.g., flocculant chemicals or rust inhibitors), and metals from piping systems and sacrificial anodes used to control corrosion. Based on analytical data for firemain system discharges, metals expected to be present in the discharge include copper, nickel, and zinc. These data indicate that the pollutant concentrations in the discharge may exceed State water quality criteria.

Previous studies have documented the potential of ballasting operations to transfer nonindigenous aquatic species into receiving waters. Ballast water potentially contains living microorganisms, plants, and animals that are native to the location where the water was pumped aboard. When the ballast water is transported to another port or coastal area and discharged, the surviving organisms are released and have the potential to invade and impact the local ecosystem.
The Navy, MSC, and Coast Guard either currently implement or are in the process of approving a ballast water management policy requiring open-ocean ballast water exchange, based on guidelines established by the International Maritime Organization. 1 

### These management practices demonstrate the availability of controls to mitigate the potential adverse environmental impacts from this discharge. Therefore, EPA and DoD have determined that it is reasonable and practicable to require a MPCD for discharges of clean ballast.

5.1.5 Compensated Fuel Ballast

This intermittent dischar ge is composed of the seawater taken into, and discharged from, tanks designed to hold both fuel and ballast water to maintain the stability of the vessel.
Compensated fuel ballast systems are configured as a series of fuel tanks that automatically draw in seawater to replace fuel as it is consumed. Keeping the fuel tanks full in this manner enhances the stability of a vessel by using the weight of the seawater to compensate for the mass of ballast lost through fuel consumption. During refueling, fuel displaces the seawater, and the displaced seawater is discharged overboard.
Compensated fuel ballast is discharged by approximately 165 Navy surface vessels and submarines. In most cases, surface ships with compensated fuel ballast systems discharge directly to surface waters each time they refuel. However, in some situations that discharge is collected for processing on shore. Surface vessels are refueled both in port and at sea. All at-sea refueling is accomplished beyond 12 n.m. from shore. For submarines, refueling occurs only in port and the compensated ballast is transferred to shore facilities for processing.5- 8



### The compensated fuel ballast discharge can contain 2-propenal, phosphorus, thallium, oil (and its constituents, such as benzene, phenol, and toluene), copper, mercury (a bioaccumulative chemical of concern), nickel, silver, and zinc. Concentrations of 2-propenal, benzene, copper, nickel, phosphorus, silver, thallium, and zinc can exceed acute Federal criteria or State acute water quality criteria. The compensated fuel ballast discharge can also contain nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen) in concentrations exceeding the most stringent State water quality criteria.
To reduce the discharge of fuel in compensated fuel ballast discharge, the Navy has instituted operational guidelines intended to reduce the potential for overfilling tanks or discharging excessive amounts of fuel entrained in the displaced compensating water while refueling surface vessels. These guidelines limit the amount of fuel that can be taken on in port (i.e., to prevent “topping off” the fuel tanks) and establish maximum allowable rates for in port refueling. Additionally, submarines transfer all compensated fuel ballast water to shore facilities when refueling diesel fuel oil tanks. These operational controls for surface vessel refueling and the practice of transferring the discharge to shore for submarines demonstrates the availability of MPCDs to mitigate potential adverse environmental impacts; therefore, EPA and DoD have determined it is reasonable and practicable to require the use of a MPCD for compensated fuel ballast.

5.1.6 Controllable Pitch Propeller Hydraulic Fluid
This discharge is the hydraulic fluid that is discharged into the surrounding seawater from propeller seals as part of normal operation, and the hydraulic fluid released during routine maintenance of the propellers.
Controllable pitch propellers (CPP) are used to control a vessel’s speed or dire ction while maintaining constant propulsion plant output (i.e., varying the pitch, or “bite,” of the propeller blades allows the propulsion shaft to remain turning at a constant speed). CPP blade pitch is controlled hydraulically through a system of pumps, pistons, and gears. Hydraulic oil may be released from CPP assemblies under three conditions: leakage through CPP seals, releases during underwater CPP repair and maintenance activities, or releases from equipment used for CPP blade replacement.

Over 200 Armed Forces vessels have CPP systems. Leakage through CPP seals can occur within 12 n.m., but seal leakage is more likely to occur while the vessel is underway than while pierside or at anchor because the CPP system operates under higher pressure when a vessel is underway. Blade replacement occurs in port on an as-needed basis when dry-docking is unavailable or impractical, resulting in some discharge of hydraulic oil. Approximately 30 blade replacements and blade port cover removals (for maintenance) are conducted annually, fleetwide.
CPP assemblies are designed to operate at 400 psi without leaking. Typical pressures while pierside range from 6 to 8 psi. CPP seals are designed to last five to seven years, which is the longest period between dry-dock cycles, and are inspected quarterly to check for damage or5- 9



### excessive wear. Because of the hub design and the frequent CPP seal inspections, leaks of hydraulic oil from CPP hubs are found to be negligible. During the procedure for CPP blade replacement, however, hydraulic oil is released to the environment from tools and other equipment. In addition, hydraulic oil could also leak from the CPP hub during a CPP blade port cover removal.
The Navy’s repair procedures impose certain requirements durin g blade replacement and blade port cover removal to minimize the amount of hydraulic oil released to the extent possible. In addition, booms are placed around the aft end of the vessel to contain possible oil release during these procedures. Nevertheless, EPA and DoD have determined that the amount of hydraulic oil released during underwater CPP maintenance could create an oil sheen and exceed State water quality criteria. Constituents of the discharge could include paraffins, olefins, and metals such as copper, aluminum, tin, nickel, and lead. Metal concentrations are expected to be low because hydraulic oil is not corrosive, and the hydraulic oil is continually filtered to protect against system failures.
EPA and DoD have determined that pollution co ntrols are necessary to mitigate the potential adverse environmental impacts that could result from releases of hydraulic oil during underwater maintenance on controllable pitch propellers. The existing repair procedures and the staging of containment booms and oil skimming equipment to capture released oil demonstrate the availability of MPCDs (i.e., best management practices) for this discharge. Therefore, EPA and DoD have determined that it is reasonable and practicable to require MPCDs to control discharges of CPP hydraulic fluid.

5.1.7 Deck Runoff
Deck runoff is an intermittent discharge generated when water from precipitation, freshwater washdowns, wave action, or spray falls on the exposed portion of a vessel such as a weather deck or flight deck. This water is discharged overboard through deck openings and washes overboard any residues that may be present on the deck surface. The runoff drains overboard to receiving waters through numerous deck openings. All vessels of the Armed Forces produce deck runoff, and this discharge occurs whenever the deck surface is exposed to water, both within and beyond 12 n.m.
Contaminants present on the deck originate from topside equipment components and the many varied activities that take place on the deck. This discharge can include residues of gasoline, diesel fuel, Naval distillate fuel, grease, hydraulic fluid, soot, dirt, paint, glycol, cleaners such as sodium metasilicates, and solvents. A number of metal and organic pollutants may be present in the discharge, including silver, cadmium, chromium, copper, nickel, lead, benzene, ethylbenzene, toluene, xylene, polycyclic aromatic hydrocarbons, and phenol. Mass loadings and concentrations of these constituents will vary with a number of factors including ship operations, deck washdown frequency, and the frequency, duration, and intensity of precipitation events.5- 10



### Based on the results from limited sampling from catapult troughs (a component of runoff from aircraft carrier flight decks), oil and grease, phenols, chromium, cadmium, nickel, and lead could be present in this discharge at levels exceeding acute Federal criteria and State acute water quality criteria. If not properly controlled, oil collecting in catapult troughs can cause deck runoff from aircraft carrier flight decks to create an oil sheen on the surface of the receiving water, which would violate State water quality criteria. Armed Forces vessels already institute certain management practices intended to reduce the amount of pollutants discharged in deck runoff, including keeping weather decks cleared of debris, immediately mopping up and cleaning spills and residues, and engaging in spill and pollution prevention practices. These practices demonstrate the availability of controls to mitigate adverse impacts from deck runoff. Therefore, EPA and DoD have determined it is reasonable and practicable to require a MPCD for deck runoff.

5.1.8 Dirty Ballast
This intermittent discharge is composed of the seawater taken into, and discharged from, empty fuel tanks to maintain the stability of the vessel. The seawater is brought into these tanks for the purpose of improving the stability of a vessel during rough sea conditions. Prior to taking on the seawater as ballast, fuel in the tank to be ballasted is transferred to another fuel tank or holding tank to prevent contaminating the fuel with seawater. Some residual fuel remains in the tank and mixes with the seawater to form dirty ballast. Dirty ballast systems are configured differently from compensated ballast and clean ballast systems. Compensated ballast systems continuously replace fuel with seawater in a system of tanks as the fuel is consumed. Clean ballast systems have tanks that carry only ballast water and are never in contact with fuel. In a dirty ballast system, water is added to a fuel tank after most of the fuel is removed.
Thirty Coast Guard vessels generate dirty ballast as a discharge incidental to normal vessel operations. These Coast Guard vessels do so because their size and design do not allow for a sufficient volume of clean ballast tanks. The larger of these vessels discharge the dirty ballast at distances beyond 12 n.m. from shore, while the smaller vessels discharge the dirty ballast between 3 and 12 n.m. from shore. Coast Guard vessels monitor the dirty ballast discharge with an oil content monitor. If the dirty ballast exceeds 15 parts per million (ppm) oil, it is treated in an oil-water separator prior to discharge.
Expected constituents of dirty ballast are Nav al distillate fuel or aviation fuel. Based on sampling results for compensated fuel ballast, which is expected to have similar constituents to dirty ballast, this discharge can contain oil (and its constituents such as benzene and toluene); biocidal fuel additives; metals such as copper, mercury (a bioaccumulative chemical of concern), nickel, silver, thallium, and zinc; and the constituents 2-propenal, nitrogen (in the form of ammonia and total Kjeldahl nitrogen), and phosphorus.
Uncontrolled discharges of dirty ballast would be expected to exceed acute Federal criteria or State acute water quality criteria for oil, benzene, , copper, nickel, phosphorus, 2- propenal, silver, thallium, and zinc. Concentrations of nitrogen would be expected to exceed the most stringent State water quality criteria. The use of oil content monitors and oil-water5- 11



### separators to reduce the concentration of oil (and associated constituents) demonstrates the availability of MPCDs to control this discharge. Therefore, EPA and DoD have determined that it is reasonable and practicable to require the use of MPCDs to control discharges of dirty ballast.

5.1.9 Distillation and Reverse Osmosis Brine
This intermittent discharge is the concentrated seawater (brine) produced as a byprod uct of the processes used to generate freshwater from seawater.
Distillation and reverse osmosis plants are two types of water purification systems that generate freshwater from seawater for a variety of shipboard applications, including potable water for drinking and hotel services, and high-purity feedwater for boilers. Distillation plants boil seawater, and the resulting steam is condensed into high-purity distilled water. The remaining seawater concentrate, or “brine,” that is not evaporated is discharged overboard. Reverse osmosis systems separate freshwater from seawater using semi-permeable membranes as a physical barrier, allowing a portion of the seawater to pass through the membrane as freshwater and concentrating the suspended and dissolved constituents in a saltwater brine that is subsequently discharged overboard.
Distillation or reverse osmosis systems are installed on approximately 540 Armed Forces vessels. This discharge can occur in port, while transiting to or from port, or while operating anywhere at sea (including within 12 n.m.). Distillation plants on steam-powered vessels may be operated to produce boiler feedwater any time a vessel’s boilers are operating; however, operational policy limits its use in port for producing potable water because of the increased riskof biofouling from the water in harbors and the reduced demand for potable water. MSC steampowered vessels typically operate one evaporator while in port to produce boiler feedwater; most diesel and gas-turbine powered MSC vessels do not operate water purification systems within 12

n.m.
Pollutants detected in distillation and reverse osmosis brine include copper, iron, lead, nickel, , and zinc. The sampling data indicate that copper, lead, nickel, iron, and zinc can exceed acute Federal criteria or State acute water quality criteria. The distillation and reverse osmosis brine discharge can also contain nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen) and phosphorus in concentrations exceeding the most stringent State water quality criteria. The mass loadings of copper and iron are estimated to be significant. Thermal effects modeling of distillation plant discharges indicates that the thermal plume does not exceed State water quality criteria.
Review of existing practices indicate that certain operational controls limiting the use of distillation plants and reverse osmosis units can reduce the potential for this discharge to cause adverse environmental impacts in some instances. Additionally, it appears that, for some vessels, reverse osmosis units may present an acceptable alternative to the use of distillation plants. Reverse osmosis units discharge brines are expected to contain lower concentrations of metals because these systems have non-metallic membranes and ambient operating temperatures, resulting in less system corrosion. Further analysis is necessary before determining whether5- 12



### distillation plants should be replaced by reverse osmosis units. Nevertheless, existing operational practices for distillation and reverse osmosis plants and the availability of reverse osmosis units to replace distillation units on some vessels demonstrates the availability of MPCDs to reduce the effects of this discharge. Therefore, EPA and DoD have determined that it is reasonable and practicable to require the use of MPCDs to control discharges from distillation and reverse osmosis plants.

5.1.10 Elevator Pit Effluent
This discharge is the liquid that accumulates in, and is occasionally discharged from, the sumps of elevator wells on vessels. Most large surface ships have at least one type of elevator used to transport supplies, equipment, and personnel between different decks of the vessel. These elevators generally can be classified as either a closed design in which the elevator operates in a shaft, or an open design used to move aircraft between decks. Elevators operating in a shaft are similar to the conventional design seen in many buildings. For these elevators, a sump is located in the elevator pit to collect liquids entering the elevator and shaft areas. Deck runoff and elevator equipment maintenance activities are the primary sources of liquids entering the sump. On some vessels, the elevator sump is equipped with a drain to direct liquid wastes overboard. On others, piping is installed that allows an eductor to pump the pit effluent overboard. However, most vessels collect and containerize the pit effluent for disposal onshore or process it along with their bilgewater.
The elevators used on aircraft carriers to move aircraft and helicopters from one deck to another are an open design (i.e., there is no elevator shaft). The elevator platform is supported by cables and pulleys, and it operates on either the port or starboard side of the ship away from the hull. Unlike elevators with pits, the aircraft elevators are exposed to the water below and there are no systems in place for collecting liquid wastes.
Coast Guard, Army and Air Force vessels do not have elevators and therefore do not produce this discharge. The discharge of elevator pit effluent may occur at any location, within or beyond 12 n.m. from shore. Constituents in elevator pit effluent are likely to include grease, lubricating oil, fuel, hydraulic fluid, cleaning solvents, dirt, paint chips, aqueous film-forming foam, glycol, and sodium metasilicate. The discharge can also contain nitrogen (measured as total Kjeldahl nitrogen) and metals from firemain water used to operate eductors draining the elevator pit.
The concentrations of copper, iron, nickel, and bis(2-ethylhexyl)phthalate in firemain water (discussed in section 5.1.11) may exceed acute Federal criteria or State acute water quality criteria. The elevator pit effluent discharge can also contain nitrogen in concentrations exceeding the most stringent State water quality criteria. Constituent concentrations and mass loadings vary among ship classes depending on the frequency of elevator use, the size of the elevator openings, the amount and concentration of deck runoff, and the frequency of elevator equipment maintenance activities. Material accumulated in elevator pits is either collected for disposal onshore or directed to the bilgewater system for treatment through an oil-water separator prior to discharge. These existing practices demonstrate the availability of controls to reduce the5- 13



### potential for this discharge to cause adverse impacts on the environment. Therefore, EPA and DoD have determined that it is reasonable and practicable to require MPCDs for elevator pit effluent.

5.1.11 Firemain Systems
This discharge is the seawater pumped through the firemain system for firemain testing, maintenance, and training, and to supply water for the operation of certain vessel systems.
Firemain syst ems distribute seawater for firefighting and other services aboard ship. Firemain water is provided for firefighting through fire hose stations, sprinkler systems, and foam proportioners, which inject aqueous film-forming foam (AFFF) into firemain water for distribution over flammable liquid spills or fire. Firemain water is also directed to other services including ballast systems, machinery cooling, lubrication, and anchor chain washdown. Discharges of firemain water incidental to normal vessel operations include anchor chain washdown, firemain testing, various maintenance and training activities, bypass flow from the firemain pumps to prevent overheating, and cooling of auxiliary machinery equipment (e.g., refrigeration plants). UNDS does not apply to discharges of firemain water that occur during firefighting or other shipboard emergency situations, because they are not incidental to the normal operation of a vessel.
Firemain systems aboard Armed Forces vessels are classified as either wet or dry. Wet firemain systems are continuously charged with water and pressurized so that the system is available to provide water upon demand. Dry firemains are not continuously charged with water, and consequently do not supply water upon demand. Dry firemain systems are periodically tested and are pressurized during maintenance or training exercises, or during emergencies.
With the exception of small boats and craft, all Armed Forces vessels use firemain systems. All Navy surface ships and some MSC vessels use wet firemain systems. Submarines and all Army and Coast Guard vessels use dry firemains. Firemain system discharges occur both within and beyond 12 n.m. from shore. Flow rates depend upon the type, number, and operating time of the equipment and systems using water from the firemain system.
Samples were collected from three vessels with wet firemain systems and analyzed to determine the constituents present. Because of longer contact times between seawater and the piping in wet firemains, and the use of zinc anodes in some seachests and heat exchangers to control corrosion, pollutant concentrations in wet firemains are expected to be higher than those in dry firemain systems. Pollutants detected in the firemain discharge include nitrogen (measured as total Kjeldahl nitrogen), copper, nickel, iron, and bis(2-ethylhexyl)phthalate. The concentrations of iron exceeded the most stringent State chronic water quality criteria. The concentrations of nitrogen exceeded the most stringent State water quality criteria. Copper, nickel, and bis(2-ethylhexyl)phthalate concentrations exceeded the relevant chronic Federal criteria and State chronic water quality criteria. These concentrations contribute to a significant total mass loading in the discharge due to the large volume of water discharged from wet firemain systems. Circulation through heat exchangers to cool auxiliary machinery increases the5- 14



### temperature of the firemain water, but the resulting thermal effects do not exceed State mixing zone criteria.
Firemain systems have a low potential for transporting nonindigenous aquatic species, primarily because the systems do not transport large volumes of water over great distances. In addition, stagnant portions of the firemain tend to develop anaerobic conditions that are inhospitable to most marine organisms.
EPA and DoD believe that dry firemain systems may offer one means for reducing the total mass of pollutants discharged from firemain systems. The use of dry firemains for Coast Guard vessels demonstrates that, for at least some types of vessels, this option may be an available control mechanism. Another possible MPCD option for achieving pollutant reductions is the use of alternative piping systems (i.e., different metallurgy) that provide lower rates of pipe wall corrosion and erosion. The use of dry firemains and the potential offered by alternative piping systems demonstrates the availability of controls to mitigate potential adverse impacts on the environment. Therefore, EPA and DoD have determined that it is reasonable and practicable to require the use of a MPCD for firemain systems.

5.1.12 Gas Turbine Water Wash
Gas turbine water wash consists of water periodically discharged while cleaning internal and external components of propulsion and auxiliary gas turbines. Approximately 155 Armed Forces vessels use gas turbines for either propulsion or auxiliary power generation. Gas turbine water wash is generated within 12 n.m. and varies by the type of gas turbine and the amount of time it is operated. Because the drain collecting system is limited in size, discharges may occur within 12 n.m. On most Navy and MSC gas turbine ships, gas turbine water wash is collected in a dedicated collection tank and is not discharged overboard within 12 n.m. On ships without a dedicated collection tank, this discharge is released as a component of deck runoff, welldeck discharges, or bilgewater.
Expected constituents of gas turbine water wash are synthetic lubricating oil, grease, solvent-based cleaning products, hydrocarbon combustion by-products, salts from the marine environment, and metals leached from metallic turbine surfaces. The concentration of naphthalene (from solvents) in the discharge is expected to exceed State acute water quality criteria. To limit the impacts of gas turbine water wash discharge while operating in coastal areas, most vessels direct the discharge to a dedicated holding tank for shore disposal. This containment procedure demonstrates the availability of controls for this discharge. Therefore, EPA and DoD have determined that it is reasonable and practicable to require the use of a MPCD for gas turbine water wash.

5.1.13 Graywater
Section 312(a)(11) of the CWA defines graywater as “galley, bath, and shower water.” Recognizing the physical constraints of Armed Forces vessels and the manner in which wastewater is handled on these vessels, graywater is more broadly defined for the purposes of5- 15



### UNDS. For the purposes of this regulation, the graywater discharge consists of graywater as defined in CWA section 312(a)(11), as well as drainage from laundries, interior deck drains, water fountains and miscellaneous shop sinks. All ships, and some small boats, of the Armed Forces generate graywater on an intermittent basis. Graywater discharges occur both within and beyond 12 n.m. from shore. Most Armed Forces vessels collect graywater and transfer it to shore treatment facilities while pierside. Some vessel types, however, have minimal or no graywater collection or holding capability and discharge the graywater directly overboard while in transit. Graywater is discharged pierside when collection facilities are not available.
Less than half of all graywater discharged within 12 n.m. occurs pierside from vessels lacking graywater collection holding capability. The remainder of the discharge in coastal waters occurs during transit within 12 n.m. from shore. Copper, lead, mercury (a bioaccumulative chemical of concern), nickel, silver, and zinc were detected in concentrations that exceed acute Federal criteria and State acute water quality criteria. Graywater also contains conventional and nonconventional pollutants, such as total suspended solids, biochemical oxygen demand, chemical oxygen demand, oil, grease, ammonia, nitrogen, and phosphates. Due to the large volume of graywater generated each year, the mass loadings of these constituents may be significant. The use of containment systems to transfer graywater to shore treatment facilities demonstrates the availability of controls to mitigate adverse impacts on the environment. Therefore, EPA and DoD have determined that it is reasonable and practicable to require a MPCD to control graywater discharges.

5.1.14 Hull Coating Leachate
This discharge consists of constituents that l each, dissolve, ablate, or erode from hull paints into the surrounding seawater.
Vessel hulls that are continuously exposed to seawater are typically coated with a base anti-corrosive coating covered by an anti-fouling coating. This coating system prevents corrosion of the underwater hull structure and, through leaching action releases antifouling compounds. Ablative coatings allow the paint surface to erode or dissolve to release antifouling compounds. These compounds inhibit the adhesion of biological growth to the hull surface.
The coatings on most vessels of the Armed Forces are either copper- or tributyl tin (TBT)-based, with copper-based ablative paints being the most predominant coating system. The Armed Forces have been phasing out the use of TBT paints, and currently it is found only on approximately 10-20 percent of small boats and craft with aluminum hulls. Small boats and craftthat spend most of their time out of water typically do not receive an anti-corrosive or antifouling coating.
Hull coating leachate is generated continuously whenever a vessel hull is exposed to water, within and beyond 12 n.m. from shore. Priority pollutants expected to be present in this discharge include copper and zinc. TBT is also expected to be present in this discharge for those vessels with TBT paint. The release rate of the constituents in hull coating leachate varies with the type of paint used, water temperature, vessel speed, and the age of the coating. Using average5- 16



### release rates derived from laboratory tests, the wetted surface area of each vessel, and the number of days the vessel is located within 12 n.m., EPA and DoD estimated the mass of copper, zinc, and TBT released in the leachate and concluded that the discharge has the potential to cause an adverse environmental effect.
Annual releases of TBT are expected to decrease since TBT coatings are being phased out by DoD and the Coast Guard. Both DoD and the commercial industry have conducted research on the use of advanced antifouling coatings such as easy release coatings (e.g., silicone) that resist biofouling when the vessel is in motion and a critical speed is reached. The combination of phasing out TBT paints, the potential to establish limits on copper release rates for copper-based coating systems, and the potential for alternative coating systems to reduce copper discharges demonstrates the availability of controls to mitigate potential environmental impacts from hull coating leachate. Thus, EPA and DoD determined that it is reasonable and practicable to require use of a MPCD for hull coating leachate.

5.1.15 Motor Gasoline Compensating Discharge
This intermittent discharge consists of seawater taken into, and discharged from, motor gasoline tanks. Motor gasoline (MOGAS) is used to operate vehicles and equipment stored or transported on some Navy amphibious vessels. MOGAS is stored in a compensating fuel tank system in which seawater is automatically added to fuel tanks as the gasoline is consumed in order to eliminate free space where vapors could accumulate. The compensating system is used for MOGAS to provide supply pressure for the gasoline and to keep the tank full to prevent potentially explosive gasoline vapors from forming. During refueling, gasoline displaces seawater from the tanks, and the displaced seawater is discharged directly overboard.
The Navy has two classes of vessels with MOGAS storage tanks. Eleven of these vessels are homeported in the U.S. Based on operational practices, vessels with MOGAS storage tanks typically refuel once per year, and the refuelings are always conducted in port. Therefore, all discharges from the MOGAS compensating system occur in port.
Seawater in the MOGAS compensating system is in contact with the gasoline for long periods of time. MOGAS discharges are expected to contain components of gasoline, including benzene, ethylbenzene, toluene, phenols, and naphthalenes at concentrations that exceed acute water quality criteria.
Specific operating procedures are followed when refuelin g MOGAS tanks to reduce the potential for discharging gasoline. These procedures require MOGAS tanks to be filled slowly and prohibit filling the tanks beyond 80 percent of the total tank capacity. Containment is placed around hose connections to contain any releases of gasoline, and containment booms are placed in the water around the vessel being refueled. Diffusers are used within the tanks to prevent entraining fuel into the discharged compensating water. These management practices demonstrate the availability of controls to mitigate potential adverse impacts to the environment. Therefore, EPA and DoD have determined that it is reasonable and practicable to require MPCDs for the MOGAS compensating discharge.5- 17



### 5.1.16 Non-Oily Machinery Wastewater

T his intermittent discharge is composed of water leakage from the operation ofequipment such as distillation plants, water chillers, valve packings, water piping, low- and highpressure air compressors, and propulsion engine jacket coolers. Only wastewater that is not expected to contain oil is collected in this system. The discharge is captured in a dedicated system of drip pans, funnels, and deck drains to prevent mixing with oily bilgewater. Non-oily machinery wastewater from systems and equipment located above the waterline is drained directly overboard. Non-oily machinery wastewater from systems and equipment below the waterline is directed to collection tanks prior to overboard discharge. In limited cases, steam condensate generated when a vessel is in port is directed to the non-oily machinery wastewater collection tank. See section 5.2.10 for additional information on steam condensate discharges.
Nuclear-powered Navy surface vessels and some conventionally powered vessels have dedicated non-oily machinery wastewater systems. Most other Armed Forces vessels have no dedicated non-oily machinery wastewater system, so this type of wastewater drains directly to the bilge and is part of the bilgewater discharge.
Non-oily machinery wastewater is disc harged in port, during transit, and at sea. This discharge is generated whenever systems or equipment are in use, and varies in volume according to ship size and the level of machinery use.
Pollutants, including copper, nickel, silver, bis(2-ethylhexyl) phthalate, and zinc were present in concentrations that exceed acute Federal criteria or State acute water quality criteria. Nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen) and total phosphorus were present in concentrations exceeding the most stringent State water quality criteria. Mercury (a bioaccumulative chemical of concern) was also detected, but at concentrations that did not exceed Federal or State water quality criteria. There was significant variability in sampling data, and flow rate data were insufficient for reliably estimating mass loadings for this discharge. System design changes to control the types and numbers of contributing systems and equipment, and implementation of management practices to reduce the generation of non-oily machinery wastewater are potential options for reducing the potential impact of this discharge on the environment. For this rule, EPA and DoD have determined that it is reasonable and practicable to require MPCDs for non-oily machinery wastewater.

5.1.17 Photographic Laboratory Drains
This intermittent discharge is laboratory wastewater resulting from processing photographic film. Typical liquid wastes from these activities include spent film processing chemical developers, fixer-bath solutions and film rinse water.
Navy ship classes such as aircraft carriers, amphibious assault ships, and submarine tenders have photographic laboratory facilities, including color, black-and-white and x-ray photographic processors. The Coast Guard has two icebreakers with photographic and x-ray5- 18



### processing capabilities. The MSC has two vessels that have photographic processing equipment onboard, but the equipment normally is not operated in U.S. waters. Army, Air Force, and Marine Corps vessels do not use photographic equipment aboard their vessels and therefore do not produce this discharge.
Photographic laboratory wastes may be generated within and beyond 12 n.m. from shore, although current practice is to collect and hold the waste onboard within 12 n.m. The volume and frequency of the waste generation varies with a vessel’s photographic processing capabilities, equipment, and operational objectives.
Expected constituents in photographic laboratory wastes include acetic acid, alumin um sulfate, ammonia, boric acid, ethylene glycol, sulfuric acid, sodium acetate, sodium chloride, ammonium bromide, aluminum sulfate, and silver. Concentrations of silver can exceed acute Federal criteria and State acute water quality criteria; however, the existing data are insufficient to determine whether drainage from shipboard photographic laboratories has the potential to cause adverse environmental effects.
The Navy has adopted guidance to control photographic laboratory drains, including containerizing for onshore disposal all photographic processing wastes generated within 12 n.m., and is transitioning to digital photographic systems. The current handling practices and the availability of digital photographic systems demonstrates that MPCDs are available to mitigate potential adverse effects, if any, from photographic laboratory drains. Therefore, EPA and DoD have determined that it is reasonable and practicable to require use of a MPCD for this discharge.

5.1.18 Seawater Cooling Overboard Disc harge
This discharge consists of seawater from a dedicated system that provides noncontact cooling water for other vessel systems. The seawater cooling system continuously provides cooling water to heat exchangers, removing heat from main propulsion machinery, electrical generating plants, and other auxiliary equipment. The heated seawater is discharged directly overboard. With the exception of some small, non-self-propelled vessels and service craft, all Armed Forces vessels discharge seawater from cooling systems. Typically, the demand for seawater cooling is continuous and occurs both within and beyond 12 n.m. from shore.
Seawater cooling overboard discharge contains trace materials from seawater cooling system pipes, valves, seachests, pumps, and heat exchangers. Pollutants detected in seawater cooling overboard discharge include copper, zinc, nickel, arsenic, chromium, lead, and nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen). Copper, nickel, and silver were detected in concentrations exceeding both the chronic Federal criteria and State chronic water quality criteria. Nitrogen was detected in concentrations exceeding State chronic water quality criteria. These concentrations contribute to a significant total mass released by this discharge due to the large volume of cooling water. In addition, thermal effects modeling indicates that some vessels may exceed State thermal mixing zone requirements. The seawater cooling water system has a low potential for transporting nonindigenous species, because the residence time for most portions of the system are short. However, a strainer plate is used to5- 19



### minimize the inflow of larger biota during system operation. The strainer plate is periodically cleaned using low pressure air or steam to dislodge any accumulated material. This procedure may result in releasing biota that have attached to the plate.
A potential MPCD option for achieving pollutant reductions is the use of alternative piping systems (i.e., different metallurgy) that provide lower rates of pipe wall corrosion and erosion. The potential substitution of materials demonstrates the availability of controls to mitigate potential adverse impacts on the environment. Based on this information, EPA and DoD have determined that it is reasonable and practicable to require use of a MPCD for this discharge.

5.1.19 Seawater Piping Biofouling Prevention
This discharge consists of the additives used to prevent the growth and attachment of biofouling organisms in seawater cooling systems on selected vessels, as well as the reaction byproducts resulting from the use of these additives. Fouling reduces seawater flow and heat transfer efficiency. Aboard some vessels, active biofouling control systems are used to control biological fouling of surfaces within the seawater cooling systems. Generally, these active biofouling control systems are used when the cooling system piping does not have inherent antifouling properties (e.g., titanium piping). The most common seawater piping biofouling prevention systems include chlorination, chemical dosing, and anodic biofouling control systems. All three systems act to prevent fouling organisms from adhering to and growing on interiorpiping and components. Chlorinators use electric current to generate chlorine and chlorineproduced oxidants from seawater. Anodic biofouling control systems use electric current to accelerate the dissolving of an anode to release metal ions into the piping system. Chemical dosing uses an alcohol-based chemical dispersant that is intermittently injected into the seawater system.
Twenty-nine Armed Forces vessels use active seawater piping biofouling control systems. Nine vessels use onboard chlorinators, 19 vessels use anodic biofouling control systems, and one vessel employs chemical dosing. Chlorinators operate on a preset schedule of intermittent operation, a few hours daily. Chemical dispersant dosing is performed for one hour every three days. Anodic systems normally operate continuously.
Seawater discharged from systems with active biofouling control systems is likely to contain residuals from the fouling control agent (chlorine, alcohol-based chemical additives, or copper), in addition to constituents normally found in cooling water. Based on modeling of the discharge plume, EPA and DoD estimate that receiving water concentrations of residual chlorine could exceed chronic Federal criteria and State chronic water quality criteria. Because of the large volume of seawater discharged from these systems, the resulting mass loading of chlorine released to the environment is considered significant.
Existing operational controls that limit the residual chlorine discharged to the environment demonstrate the availability of a MPCD to mitigate the potential for adverse5- 20



### impacts from this discharge. EPA and DoD have determined that it is reasonable and practicable to require a MPCD for seawater piping biofouling prevention systems.

5.1.20 Small Boat Engine Wet Exhaust
This discharge is the seawater that is mixed and discharged with small boat propulsion engine exhaust gases to cool the exhaust and quiet the engine. Small boats are powered by either inboard or outboard engines. Seawater is injected into the exhaust of these engines for cooling and to quiet engine operation. Constituents from the engine exhaust are transferred to the injected seawater and discharged overboard as wet exhaust.
Most small boats with engines generate this discharge. The majority of inboard engines used on small boats are two-stroke engines that use diesel fuel. The majority of outboard engines are two-stroke engines that use a gasoline-oil mixture for fuel. This discharge is generated when operating small boats. Due to their limited range and mission, small boats spend the majority of their operating time within 12 n.m. from shore.
Wet exhaust from outboard engines contains several constituents that can exceed acute Federal criteria or State acute water quality criteria including benzene, toluene, ethylbenzene, and naphthalene. Wet exhaust from inboard engines can contain benzene, ethylbenzene, and total polycyclic aromatic hydrocarbons (PAHs) that can exceed State water quality criteria. Mass loadings of these wet exhaust constituents are considered large. Potential MPCD options include replacing existing outboard engines with new reduced-emission outboard engines, and ensuring all new boats and craft have inboard engines with dry exhaust systems. Therefore, EPA and DoD have determined that it is reasonable and practicable to require use of a MPCD for small boat engine wet exhaust.

5.1.21 Sonar Dome Discharge
This discharge is generated by the leaching of antifoulant materials from the sonar dome material into the surrounding seawater and the discharge of seawater or freshwater from within the sonar dome during maintenance activities. Hull-mounted sonar domes house the electronic equipment used to navigate, detect, and determine the range to objects. Sonar domes are composed of either rubber impregnated with tributyltin (TBT) anti-foulant, rubber without TBT, steel, or glass-reinforced plastic, and are filled with freshwater and/or seawater to maintain their shape and internal pressure. The discharge is generated when materials leach from the exterior surface of the dome, or when water containing leach materials from inside the dome is pumped overboard to allow for periodic maintenance or repairs on the sonar dome or equipment housed inside the dome.
Only Navy and MSC operate vessels with sonar dom es. Sonar domes are currently installed on approximately 225 vessels, including eight classes of Navy vessels and one class of MSC vessels. Sonar domes on MSC vessels are fiberglass and do not contain TBT.5- 21



### The leaching of materials from the exterior su rface of the dome is a continuous discharge and occurs both within and beyond 12 n.m. from shore. Discharges from the interior of the dome are intermittent and occur while the vessel is pierside as water inside the dome is removed to allow for periodic maintenance or repairs (approximately twice per year per dome).
Expected constituents of sonar dome water discharge are TBT, dibutyl tin, monobutyl tin, and metals such as copper, nickel, zinc, and tin. Based on sampling data in the record, concentrations of TBT, copper, nickel, and zinc can exceed acute Federal criteria or State acute water quality criteria, although fleetwide mass loadings of these constituents are not considered large (15 pounds/year of TBT, 23 pounds/year of copper, 11 pounds/year of nickel, and 122 pounds/year of zinc). Nevertheless, the Navy has instituted a program to install new sonar domes that do not have TBT-impregnated internal surfaces as existing domes require replacement. This practice demonstrates the availability of a control to mitigate potential adverse environmental impacts, if any, from sonar dome discharges. Therefore EPA and DoD have determined that it is reasonable and practicable to require a MPCD for sonar dome discharges.

5.1.22 Submarine Bilgewater

The subma rine bilgewater discharge contains a mixture of wastewater and leakage from a variety of sources that are allowed to drain to the lowest inner part of the hull, known as the bilge. These sources can include condensed steam from steam systems, spillage from drinking fountains, valve and piping leaks, and evaporator dumps (i.e., evaporator water that fails to meet specifications for use). From the various collection points in the bilge, this bilgewater is transferred via an auxiliary drain system to a series of holding tanks. Most submarines have the capability to segregate oily wastewater from non-oily wastewater. The non-oily waste is discharged directly overboard and the oily wastewater is collected in a tank that allows gravity separation of the oil and water. The separated water phase is then discharged overboard, as needed, and the oil phase held onboard until it can be transferred to shore facilities for disposal.
This discharge is generated by all submarines, all of which are operated by the Navy

. Approximately 60 of the submarines (the SSN 688 class) discharge the separated water phase from the bilgewater collection tanks within and beyond 12 n.m. from shore. The remaining submarines generally hold all bilgewater onboard until they are beyond 50 n.m. from shore. The frequency and volume of the discharge is highly variable, depending upon crew size, operating depth, and equipment conditions.
Sampling conducted onboard submarines showed concentrations of cadmium, chlorine, copper, cyanide, heptachlor, heptachlor epoxide, mercury (a bioaccumulative chemical of concern), nickel, oil, phenol, silver, and zinc that exceeded acute Federal criteria or State acute water quality criteria. Submarines use gravity separation to reduce the concentration of oil in bilgewater prior to discharge; however, this method apparently does not consistently produce a discharge that meets water quality criteria. The adequacy of existing gravity separation treatment to provide effective environmental protection will be addressed by the Phase II rulemaking. The nature of this discharge is such that submarine bilgewater, if untreated, could potentially impact the environment. Because of this potential to cause adverse environmental impacts, coupled with5- 22



### the demonstration that pollution controls are available to reduce the oil content of the discharge, EPA and DoD have determined that it is reasonable and practicable to require the use of a MPCD for submarine bilgewater.

5.1.23 Surface Vessel Bilgewater/OWS Discharge

T he Surface Vessel Bilgewater/OWS Discharge consists of a mixture of wastewater and leakage from a variety of sources that are allowed to drain to the lowest inner part of the hull, known as the bilge. The sources of surface vessel bilgewater are generally similar to those discussed above for submarines. An additional source of bilgewater for surface vessels is water from the continual blowdown of boilers (i.e., boiler blowdown). On surface vessels, bilgewater is usually transferred to an oily waste holding tank, where it is stored for shore disposal or treated in an oil-water separator (OWS) to remove oil before being discharged overboard. Some vessels also have an oil content monitor (OCM) installed downstream from the OWS to monitor bilgewater oil content prior to discharge. Vessels with OCMs have the capability to return bilgewater not meeting a preset oil concentration limit to the OWS for reprocessing until the limit is met. Oil collected from the OWS separation process is held in a waste oil tank until transferred to shore facilities for disposal.
All vessels of the Armed Forces produce bilgewater and most of the larger vessels have OWS systems. Small craft bilgewater is collected and transferred to shore facilities while pierside.
Bilgewater accumulates continuously; however, vessels of the Armed Forces do not discharge untreated bilgewater. Under current policy, bilgewater treated by an OWS can be discharged as needed within 12 n.m., while untreated bilgewater is held for transfer to a shore facility for treatment. For vessels with an OWS and OCM, oil concentrations in the treated bilgewater must be less than 15 ppm prior to overboard discharge.
Sampling data for OWS effluent show oil, copper, iron, mercury (a bioaccumulative chemical of concern), nickel, and zinc exceed acute Federal criteria or State acute water quality criteria. Sampling data also show concentrations of nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen) and phosphorus exceed the most stringent State water quality criteria. The estimated mass loading for oil is considered to be large.
The existing policies prohibiting the discharge of untreated bilgewater, and the extensive use of oil-water separators and oil content monitors demonstrate the availability of pollution controls for bilgewater. The data in the record indicate that untreated bilgewater would likely cause adverse environmental impacts. Therefore, EPA and DoD have determined that it is reasonable and practicable to require the use of a MPCD for this discharge.

5.1.24 Underwater Ship Husbandry
The underwater ship husbandry discharge is composed of materials discharged during the inspection, maintenance, cleaning, and repair of hulls and hull appendages performed while the5- 23



### vessel is waterborne. Underwater ship husbandry includes activities such as hull cleaning, fiberglass repair, welding, sonar dome repair, propulsor lay-up, non-destructive testing, masker belt repairs, and painting operations.
Underwater ship husbandry discharge is created occasionally by all Navy surface ships and submarines, and some Coast Guard vessels. These ship husbandry operations are normally conducted pierside. With the exception of underwater hull cleaning and propulsor (i.e., propeller) lay-up, other ship husbandry discharges have a low potential for causing an adverse environmental effect. Underwater hull cleaning is conducted by divers using a mechanical brush system. Copper and zinc are released during cleaning in concentrations that exceed acute Federal criteria and State acute water quality criteria and produce a significant mass loading of constituents. The copper and zinc in this discharge originate from the anti-fouling and anticorrosive hull coatings applied to vessels. Data from commercial vessels indicate that underwater hull cleaning also has the potential to transfer nonindigenous aquatic species. Propulsor lay-up requires the placement of a vinyl cover over the propulsor to reduce fouling of the propulsor when the vessel is in port for extended periods. Chlorine-produced oxidants are generated from impressed current cathodic protection systems and can build up within the cover to levels exceeding State water quality criteria. However, discharges from this operation, as well as other ship husbandry operations (excluding hull cleaning) are infrequent and small in terms of volume or mass loading.
The Navy has established policies to minimize the number of hull cleanings, based on the degree to which biological fouling has occurred. In addition, the Navy has established procedures to use the least abrasive cleaning equipment necessary as a means for reducing the mass of copper and zinc in the discharge. These practices represent available controls to mitigate adverse impacts from underwater ship husbandry operations, and EPA and DoD have determined that it is reasonable and practicable to require the use of a MPCD to control this discharge.

5.1.25 Welldeck Discharges
This discharge is the water that accumulates from the s eawater flooding of the docking well (welldeck) of a vessel used to transport, load, and unload amphibious vessels, and from the maintenance and freshwater washings of the welldeck and equipment and vessels stored in the welldeck.
Amphibious operations b y the Armed Forces require transport of vehicles, equipment, and personnel between ship and shore on landing craft. The landing craft are stored in a docking well, or welldeck, of some classes of amphibious warfare ships. To load or unload landing craft, amphibious warfare ships may need to flood the welldeck by taking on ballast water and sinking the aft (rear) end of the ship. Water that washes out of the welldeck contains residual materials that were on the welldeck prior to flooding. Other welldeck discharges are created by routine operations such as washing equipment and vehicles with potable water, washing the gas turbine engines of air-cushion landing craft (LCACs) in the welldeck with mild detergents, and graywater from stored utility landing craft (LCUs). Additionally, the U.S. Department of Agriculture (USDA) requires washing welldecks, vehicle storage areas, and equipment upon5- 24



### return from overseas locations. The washing is required to ensure that there is no inadvertent transport of nonindigenous species to land. USDA-required washes of welldecks and vehiclestorage areas occur pierside, while vehicles and equipment are washed onshore in a USDAdesignated area. Effluent from such shipboard activities drain to unflooded welldecks and are discharged directly overboard.
The Navy is the only branch of the Armed Forces with ships having welldecks. Thirtythree amphibious warfare ships produce this discharge, which is released both within and beyond 12 n.m. from shore.
Depending upon the speci fic activities conducted, welldeck discharges contain a variety of residual constituents, including oil and grease, ethylene glycol (antifreeze), chlorine, detergents/cleaners, metals, solvents, and sea-salt residues. The volume of welldeck washout varies depending upon the type of landing craft to be loaded or unloaded. The greatest volume of welldeck discharge occurs when LCUs are being loaded into, or unloaded from the welldeck. Loading and unloading of LCACs does not require the welldeck to be flooded. Instead, a small “surge” of water enters the ship during these operations. Constituent concentrations in welldeck washout are expected to be low due to dilution in the large volume of water discharged, and because of general housekeeping procedures that require containment and cleanup of materials spilled on the welldeck.
Other discharges from the welldeck include vehicle and craft washwater, gas turbine engine washes, and USDA washes. Constituents of these discharges are expected to be identical to those in welldeck washout. Of the various welldeck discharges, gas turbine water washes and USDA washes may result in hydrocarbon, or metal concentrations that exceed acute water qualitycriteria. In addition, there is a potential for nonindigenous species to be introduced from USDArequired welldeck washes, although it should be noted that the viability of any species introduced is questionable since they generally would have been exposed to air for extended periods of time prior to their introduction into U.S. coastal waters (i.e., for the most part, these species would have been removed from vehicles and deck surfaces and thus it would not be a water-to-water transfer, in contrast to species transfers from ballast water systems).
Existing practices f

or containment and cleanup of welldeck spills demonstrate the availability of controls to reduce contamination of welldeck discharges and the potential for causing adverse environmental impacts (e.g., oil sheens). EPA and DoD have determined that it is reasonable and practicable to require a MPCD for welldeck discharges.5- 25



### 5.2 Discharges Determined To Not Require MPCDs

For the reasons discussed below, EPA and DoD have determined that it is not reasonable and practicable to require the use of a MPCD to control 14 discharges incidental to the normal operation of Armed Forces vessels. These discharges have a low potential to adversely affect the environment by introduction of chemical constituents, thermal pollution, bioaccumulative chemicals of concern, or nonindigenous species.

As discussed below, in some cases, the concentration of one or more constituents in the undiluted discharge exceed water quality criteria at the point of discharge. However, such discharges occur in low volumes or infrequently. In all of these instances, either the pollutant concentration in the discharge plume quickly falls below water quality criteria once the dilution effect of mixing zones is taken into account, or the low mass loading of the discharge is unlikely to adversely affect the environment.
These 14 discharge types do not require control, and no control standards will be set for them, in Phase II of UNDS development. Upon promulgation of this Phase I rule, States and their political subdivisions are prohibited from adopting or enforcing any statute or regulation to control these discharges, except by establishing no -discharge zones. States can petition EPA and DoD to review the determination not to require MPCDs for these discharges.
The discussion below provides a brief description of the discharges and the systems that produce the discharge and highlights the most significant constituents released to the environment and other characteristics of the discharge. A more detailed discussion of these discharges is presented in Appendix A.

5.2.1 Boiler Blowdown
This discharge is the water and steam discharged during the blowdown of a boiler or steam generator, or when a safety valve is tested. Boilers are used to produce steam for propulsion and a variety of auxiliary and hotel services. Water supplied to the boiler system (feedwater) is treated with chemicals to inhibit corrosion and the formation of scale in the boiler and boiler system piping. Periodically, water must be removed from the boiler to control the buildup of particulates, sludge, and treatment chemical concentrations. The term “blowdown” refers to the minimum discharge of boiler water required to prevent the buildup of these materials in the boiler to levels that would adversely affect boiler operation and maintenance. There are four types of boiler blowdown procedures employed on Armed Forces vessels: 1) surface blowdowns for removing materials dissolved in the boiler water and for controlling boiler water chemistry; 2) scum blowdowns for removing surface scum; 3) bottom blowdowns for removing sludge that settles at the bottom of boilers; and 4) continuous blowdowns for removing dissolved metal chelates and other suspended matter. The type of blowdown used is a function of the boiler water chemistry and thus varies among vessel classes. With the exception of continuous blowdowns, boiler blowdowns are discharged below the vessel waterline. Continuous blowdowns are discharged inside the vessel and are directed to the bilge. These are addressed as part of the surface vessel bilgewater/OWS discharge (see section 5.1.23). Another discharge5- 26



### occurs during periodic testing of steam generator safety valves on nuclear-powered vessels. The safety valve discharge is a short-duration release of steam below the vessel waterline.
Approximately 360 surface vessels and submarines discharge boiler blowdowns directly to receiving waters. These blowdowns occur both within and beyond 12 n.m. from shore. Nuclear-powered ships perform steam generator safety valve testing only in port once every five years.
Boiler blowdown is discharged intermittently in small volumes (approximately 300 gallons per discharge), at high velocities (over 400 feet/second), and at elevated temperatures (over 325 degrees Fahrenheit). Boiler water treatment chemicals used by Armed Forces vessels include ethylenediamine-tetraacetic acid (EDTA), hydrazine, sodium hydroxide, and disodium phosphate. Sampling data for boiler blowdowns indicate the presence of nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen), phosphorus, hydrazine, iron, bis(2- ethylhexyl)phthalate, copper, lead, nickel, and zinc. Boiler blowdown discharges from conventionally powered boilers can exceed Federal criteria or State water quality criteria for copper, iron, lead, nickel, zinc, bis(2-ethylhexyl)phthalate, nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen) and phosphorus. Blowdown discharges from nuclear-powered steam generators exceed acute Federal criteria and State acute water quality criteria for copper, and the most stringent State acute water quality criteria for lead and nickel. For nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen) and phosphorus, the most stringent State water quality criteria was exceeded. However, the turbulent mixing resulting from the high velocity discharge, and the relatively small volume of the boiler blowdown causes pollutant concentrations to rapidly dissipate to background levels or below acute Federal criteria and State acute water quality criteria within a short distance from the point of discharge.
Based on thermal modeling of the discharge plume, boiler blowdowns are not expected to exceed State standards for thermal effects. Thermal effects from safety valve testing are substantially less than those from blowdowns, thus safety valve testing also will not exceed State standards for thermal effects.
While the pollutant concentrations in the boiler blowdown discharges exceed acute Federal criteria and State acute water quality criteria, they are discharged intermittently and in small volumes. Further, these discharges are distributed throughout the U.S. at Armed Forces ports, and each individual port receives only a fraction of the total fleetwide mass loading. Based on the information in the record regarding the low mass of pollutants discharged during boiler blowdowns and safety valve discharges, and the manner in which the discharges take place, there is a low potential for causing adverse environmental impacts. Therefore, EPA and DoD have concluded that it is not reasonable and practicable to require the use of a MPCD to mitigate adverse impacts on the marine environment for this discharge.5- 27



### 5.2.2 Catapult Wet Accumulato r Discharge
This discharge is the water discharged from a catapult wet accumulator, which stores a steam/water mixture for launching aircraft from an aircraft carrier.
The steam used as the motive force for operating the catapults for launching aircraf t is provided to the catapult from a steam reservoir, referred to as the catapult wet accumulator. The catapult wet accumulator is a pressure vessel containing a steam/water mixture at a high temperature and pressure. The accumulator is fed an initial charge of boiler feedwater and provided steam from boilers. As steam is released from the accumulator for the catapult launch, the pressure reduction in the accumulator allows some of the water to flash to steam, providing additional steam to operate the catapult. During operation of the system, steam condenses in the accumulator and causes the water level in the accumulator to gradually rise. Periodic blowdowns of the accumulator are required to maintain the water level within operating limits. This steam/water mixture released during the blowdown is discharged below the vessel waterline. In addition to blowdowns required during catapult operation and testing, wet accumulators are emptied prior to major maintenance of the accumulator or when a carrier will be in port for more than 72 hours. When emptying the accumulator, multiple blowdowns are performed over an extended period (up to 12 hours) to reduce pressure prior to draining the tank.
The Navy is the only branch of the Armed Forces with vessels ge nerating this discharge. Eleven of the aircraft carriers are homeported in the United States.
Wet accumulator blowdowns are performed during flight operations, which occur beyond 12 n.m., and during catapult testing, which occurs within 12 n.m. from shore. Wet accumulators are emptied outside 12 n.m. when returning to port for accumulator maintenance or when the carrier will be in port for more than 72 hours. If catapult testing is conducted in port, and the carrier will remain in port for more than 72 hours following the testing, the accumulator will be emptied in port.
Catapult wet accumulator blowdowns have little potential for causing adverse environmental impacts because of the low pollutant loadings and thermal effects of this discharge. Because boiler feedwater is used for the initial charge of water to an empty accumulator, the constituents of the discharge include water treatment chemicals present in boiler feedwater. These chemicals include EDTA, disodium phosphate, and hydrazine. During normal operation, the boiler feedwater chemicals are diluted by the supplied steam. Additional constituents present in the blowdowns originate from the steam provided to the accumulator. Based on sampling data for steam condensate (a similar discharge discussed below in section 5.2.10) and the volume of wet accumulator blowdowns performed within 12 n.m., the combined mass loading for all metals is estimated at less than 0.01 pounds/year. Constituents found in steam condensate include benzidine, bis(2-ethylhexyl)phthalate, copper, nickel, nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen), and phosphorus. The concentrations of benzidine, copper, and nickel in steam condensate were found to exceed acute Federal criteria and State acute water quality criteria. The concentration of bis(2- ethylhexyl)phthalate was found to exceed State acute water quality criteria. The concentrations5- 28



### of nitrogen and phosphorus were found to exceed the most stringent State water quality criteria. However, using steam condensate data may overestimate wet accumulator pollutant concentrations because of the shorter contact time between catapult steam and its associated piping system (resulting in less opportunity to entrain corrosion products from the piping). Based on thermal modeling of the discharge plume, catapult wet accumulator blowdowns are not expected to exceed State standards for thermal effects.
Catapult wet accumulator blowdowns have little potential for causing adverse environmental impacts because of the very low pollutant mass loadings in this discharge and because of the low thermal effects from this discharge. Therefore, EPA and DoD determined that it is not reasonable and practicable to require the use of a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.3 Cathodic Protection
This discharge consists of the constituents released into the surrounding water from sacrificial anodes or impressed current cathodic protection systems used to prevent hull corrosion.
Steel-hulled vessels require corrosion protection. In addition to anti-corrosion hull paints, these vessels employ cathodic protection which is provided by either sacrificial anodes or Impressed Current Cathodic Protection (ICCP) systems. The most common cathodic protection system for vessels of the Armed Forces is the zinc sacrificial anode, although a few submarines use aluminum anodes. With the sacrificial anode system, zinc or aluminum anodes attached to the hull will preferentially corrode from exposure to the seawater and thereby minimize corrosion of the vessel’s hull.
In ICCP systems, the vessel’s electrical system passes a current through inert platinumcoated anodes. This current protects the hull in a manner similar to sacrificial anodes by generating current as the anodes corrode. Depending on the type of cathodic protection used, the discharge will include either zinc or aluminum from sacrificial anodes, or chlorine-produced oxidants (CPO) from ICCP systems. Zinc anodes are approximately 99.3% zinc and contain small amounts of zinc, silicon, and indium (for activation). Aluminum anodes can contain 0.001% mercury as an impurity; mercury is a known bioaccumulator.
Approximately 2,170 large Armed Forces vessels use cath odic protection. Of these, nearly 270 have ICCP systems, fewer than five use aluminum sacrificial anodes, and the remaining use zinc sacrificial anodes. The discharge is continuous while the vessel is waterborne and occurs both within and beyond 12 n.m. from shore.
EPA and DoD modeled the discharge from cathodic protection systems to determine the range of constituent concentrations that could be expected in the water surrounding a vessel. This discharge is best described as a mass flux of reaction byproducts emanating from the electro-chemical reaction that occurs at the anodes. Two separate modeling techniques were used for both sacrificial anodes and ICCP systems. The first technique was a dilution model for5- 29



### harbors that takes into account the number of homeported vessels and harbor-specific volume and tidal flow information. Three Navy ports were modeled, representing a range of port sizes. The resulting constituent concentrations calculated for the three ports in this dilution model were below chronic Federal criteria and State chronic water quality criteria.
The second technique modeled mixing zones around a vessel using calculations for a hull size typical of vessels using cathodic protection systems. The mixing model results indicate that a mixing zone of five feet for CPO and 0.5 feet for zinc results in concentrations below the chronic Federal criteria or State chronic water quality criteria. For vessels with aluminum anodes, a mixing zone of less than 0.1 feet achieves concentrations below chronic Federal criteria and State chronic water quality criteria. Concentrations of mercury will be 1,000 times lower than the acute State water quality criteria and 35 times lower than the chronic criteria. The total amount of mercury discharged from aluminum anodes on all Armed Forces vessels is estimated to be less than 0.001 pounds annually.
For ICCP calculations, the modeling is based on an assumption that 100 percent of the supplied electrical current results in CPO generation. Less CPO is actually expected to be generated because the efficiency of the chlorine generation process is known to be less than 100 percent. In addition, using the generation rate alone does not account for the rapid decay of CPO in water through chemical reactions involving CPO, which occur within minutes.
The dilution and mixing zone modeling performed for this discharge indicates that cathodic protection has a low potential for causing adverse impacts on the marine environment. Therefore, EPA and DoD determined that it is not reasonable and practicable to require the use of a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.4 Freshwater Lay-Up
This discharge is the potable water that is periodically discharged from the seawater cooling system while the vessel is in port, and the cooling system is in a lay-up mode.
Seawater cooling systems are used onboard some Armed Forces vessels to remove heat from main propulsion machinery, electrical generating plants and other auxiliary equipment. These are single-pass, non-contact cooling systems whereby the seawater enters the hull, is pumped through a piping network and circulated through one or more heat exchangers, then exits the vessel. On certain vessels, the seawater cooling systems are placed in a stand-by mode, or lay-up, when the machinery is not in use. The lay-up is accomplished by blowing the seawater from the condenser with low-pressure air. The condenser is then filled with potable water and drained again to remove residual seawater as protection against corrosion. Then, the condenser is refilled with potable water for the actual lay-up. After 21 days, the lay-up water is discharged overboard and the condenser refilled. The condenser is discharged and refilled on a 30-day cycle thereafter. The volume of each condenser batch discharge is approximately 6,000 gallons.
The Navy is the only branch of the Armed Forces with vessels discharging freshwater layup. All submarines generate this discharge, which only occurs while in port. Eight aircraft5- 30



### carriers also lay-up their condensers; however, these condensers are drained to the bilge and the water is handled as bilgewater. Generally, the cooling system is only placed in a lay-up condition if the vessel remains in port for more than three days and the main steam plant is shut down.
Sampling data for submarine freshwater lay-up indicate the presence of chlorine, nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen), and the priority pollutants chromium, copper, lead, nickel, and zinc. The concentrations of chlorine, copper, nickel, and zinc can exceed acute Federal criteria or State acute water quality criteria. For nitrogen and phosphorus, the most stringent State water quality criteria was exceeded. Chlorine was detected in the initial flush discharge, but was not found in the extended lay-up discharge. Mass loadings for the priority pollutants (copper, nickel, and zinc) were estimated using total annual discharge volumes and average pollutant concentrations. The total mass loading from all discharges of freshwater lay-up from submarines is estimated at 7 pounds/year of copper, 36 pounds/year of nickel, 29 pounds/year of zinc, 55 pounds/year of nitrogen, 0.58 pounds of total chlorine, 8.3 pounds/year total phosphorus. The mass discharge from any individual freshwater lay-up discharge event would be a fraction of that total. Because of the low total annual mass loading, the low frequency at which the discharge occurs, and the volume of an individual discharge event, discharges of freshwater lay-up have a low potential for causing adverse environmental impacts. Therefore, EPA and DoD determined that it is not reasonable and practicable to require the use of a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.5 Mine Countermeasures Equipment Lubrication
This discharge consists of the constituents released into the surrounding seawater by erosion or dissolution from lubricated mine countermeasures equipment when the equipment is deployed or towed. Various types of mine countermeasures equipment are deployed and towed behind vessels to locate and destroy mines. Lubricating grease and oil applied to this equipment can be released into surrounding seawater during its deployment and use, including during training exercises.
The Navy is the only branch of the Armed Forces with a mine countermeasures mission. The Navy uses two classes of vessels, totaling 23 ships, to locate, classify, and destroy mines. The discharge is generated during training exercises, which are normally conducted between 5 and 12 n.m. from shore. Depending on the class of vessel and the type of mine countermeasures equipment being used, the number of training exercises conducted by each vessel ranges from 6 to 240 per year.
Using estimates of the amount of lubricant released during each training exercise, EPA and DoD calculated the annual mass loading of lubricant discharges to be approximately 770 pounds of grease and oil. Using the estimates of the pollutant mass loading released during an exercise, and the volume of water through which the countermeasures equipment is towed or operated during an exercise, EPA and DoD estimated the oil and grease concentrations resulting from mine countermeasures training exercises. These estimated concentrations of oil and grease in the receiving water range from 0.688 to 7.3 μg/l and do not exceed acute water quality criteria.5- 31



### An additional calculation was performed for the lift cable for th e SLQ-48 mine neutralization vehicle (MNV). This lift cable is lubricated with grease; however, the cable is not towed through the water and is only used to deploy or recover the MNV while a vessel is stationary. Using the maximum predicted release of 0.15 ounces of grease per deployment, modeling results indicate that the grease released from the lift cable would disperse in the surrounding receiving waters and be at concentrations below the most stringent State acute water quality criteria within 3 to 5 feet from the cable.
Most discharges from mine countermeasures equipment occur while vessels are underway and the pollutants are quickly dispersed in the environment due to the turbulent mixing conditions caused by the wake of the vessel and towed equipment. Further, these discharges take place beyond 5 n.m. from shore in waters with significant wave energy, allowing for rapid and wide dispersion of the releases. The manner in which these releases occur, coupled with the relatively small amounts of lubricants released, results in this discharge having a low potential for causing adverse impacts on the marine environment. Therefore, EPA and DoD determined that it is not reasonable and practicable to require the use of a MPCD to mitigate adverse impacts on the marine environment for the mine countermeasures equipment lubrication discharge.

5.2.6 Portable Damage Control Drain Pump Discharge
This discharge consists of seawater pumped through the portable damage control drain pump and discharged overboard during periodic testing, maintenance, and training activities.
Portable damage control (DC) drain pumps are used to remove water from vessel compartments during emergencies or to provide seawater for shipboard firefighting in the event water is unavailable from the firemain system. The types of pumps used are described in section 5.2.7, Portable Damage Control Drain Pump Wet Exhaust. Discharges from drain pumps being used during onboard emergencies are not incidental to normal vessel operations, and therefore are not within the scope of this rule. These pumps are, however, periodically operated during maintenance, testing, and training, and pump discharges during these activities are within the scope of this rule. To demonstrate that the pumps are functioning properly, the suction hose is hung over the side of the vessel and the pump operated to verify that the pump effectively transfers the seawater or harbor water. This pump effluent is discharged directly overboard during this testing.
All large ships and selected boats and craft of the Armed Forces generate this discharge. As part of equipment maintenance, testing, and training, the pumps are operated both within and beyond 12 n.m. from shore. Navy, Army, and MSC vessels operate portable DC drain pumps for approximately 10 minutes per month and an additional 15 minutes/year to demonstrate working order and condition. Coast Guard vessels operate their portable DC drain pumps for approximately 30 minutes/month for maintenance and testing.

This discharge consists of seawater/harbor water that only briefly passes through a pumping process. The drain pump discharge is unlikely to cause adverse impacts because the5- 32



### water has a residence time of less than five seconds in the pump and associated suction and discharge hoses, and no measurable constituents are expected to be added to the seawater/harbor water. Therefore, EPA and DoD determined it is not reasonable and practicable to require the use of a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.7 Portable Damage Control Drain Pump Wet Exhaust
This periodic discharge is seawater that has mixed and been discharged with portable damage control drain pump exhaust gases to cool the exhaust and quiet the engine.

Po rtable, engine-driven pumps provide seawater for shipboard firefighting in the event water is unavailable from the firemain. Two models of these portable damage control (DC) drain pumps are used: P-250 and P-100. The P-250 pumps operate on gasoline, injected with oil-based lubricants. Part of the seawater output from these pumps is used to cool the engine and quiet the exhaust. This discharge, termed wet exhaust, is typically routed overboard through a separate exhaust hose and does not include the main discharge of the pump which is classified separately as Portable Damage Control Drain Pump Discharge and discussed in section 5.2.6.
Fuel residuals, lubricants, or their combustion byproducts are present in P-250 engineexhaust gases, condense in the cooling water stream, and are discharged as wet exhaust. The P100 model operates on diesel fuel. Although the engine that drives the P-100 pump is air-cooled and no water is injected into the exhaust of the pump, a small amount of water contacts the engine during pump priming. Up to one-seventh of a gallon of water may be discharged during each priming event. This water discharged during P-100 priming is considered part of the portable DC drain pump wet exhaust.
The Navy operates approximately 910 drai n pumps, the MSC approximately 140 drain pumps, and the Coast Guard approximately 370 drain pumps.
Portable DC drain pump wet exhaust discharges occur during training and monthly planned maintenance activities both within and beyond 12 n.m. from shore. During monthly maintenance activities, the pumps are run for approximately 10 to 30 minutes. The use of portable DC drain pumps during onboard emergencies is not incidental to normal operations, and therefore not within the scope of this rule.

Based on data in the record, the wet exhaust discharge is likely to include metals, oil and grease, and volatile and semi-volatile organic compounds. The concentrations of copper, lead, nickel, silver, and zinc in portable DC drain pump wet exhaust can exceed acute Federal criteria and State acute water quality criteria. Concentrations of oil and grease, benzene, toluene, ethylbenzene, and naphthalene can exceed State acute water quality criteria. Concentrations of these constituents in receiving waters are not expected to exceed water quality criteria because they will dissipate quickly since the mass loadings per discharge event are small and the discharge locations are dispersed fleetwide. The discharge from each of the 500 P-250 pumps occurs separately at different discharge locations. On average, each P-250 pump discharges less than 0.3 pounds of pollutants per discharge event. The duration of each discharge is short,5- 33



### averaging less than 30 minutes. These factors allow the pollutants to dissipate rapidly. Based on this information, the portable DC drain pump wet exhaust is expected to have a low potential for exhibiting adverse environmental impacts on the marine environment. Therefore, EPA and DoD determined it is not reasonable and practicable to require a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.8 Refrigeration and Air Conditioning Condensate
This discharge is the drainage of condensed moisture from air conditioning units, refrigerators, freezers, and refrigerated spaces. Refrigerators, refrigerated spaces, freezers, and air conditioning units produce condensate when moist air contacts the cold evaporator coils. This condensate drips from the coils and collects in drains. Condensate collected in drains above the vessel waterline is continuously discharged directly overboard. Below the waterline, condensate is directed to the bilge, non-oily machinery wastewater system, or is retained in dedicated holding tanks prior to periodic overboard discharge.

Appro ximately 650 Navy, MSC, Coast Guard, Army, and Air Force vessels produce this discharge. The condensate may be discharged at any time, both within and beyond 12 n.m. from shore.
Condensate flow rates depend on air temperature, humidity, and the number a nd size of cooling units per vessel. The discharge can contain cleaning detergent residuals, seawater from cleaning refrigerated spaces, food residues, and trace metals leached from contact with cooling coils and drain piping. Because evaporator coils are made from corrosion-resistant materials and condensation is non-corrosive, condensate is not expected to contain metals in significant concentrations. Discharges of refrigeration and air conditioning condensate are expected to have a low potential for causing adverse environmental impacts, therefore EPA and DoD determined it is not reasonable and practicable to require a MPCD to mitigate adverse impacts on the marine environment for condensate discharges.

5.2.9 Rudder Bearing Lubrication
This discharg e is the oil or grease released by the erosion or dissolution from lubricated bearings that support the rudder and allow it to turn freely. Armed Forces vessels generally use two types of rudder bearings, and two lubricating methods for each type of rudder bearing: 1) grease-lubricated roller bearings; 2) oil-lubricated roller bearings; 3) grease-lubricated stavebearings; and 4) water-lubricated stave bearings. Only oil-lubricated roller bearings and greaselubricated stave bearings generate a discharge.
Approximately 220 Navy vessels, 50 Coast Guard vessels, and eight MSC vessels use a type of rudder bearing that generates this discharge. The discharge occurs intermittently,primarily when a vessel is underway or its rudder is in use, although some discharges from oillubricated roller bearings could potentially occur pierside even when the rudder is not being used because the oil lubricant is slightly pressurized.5- 34



### This discharge consists of oil leakage and the washout of grease from rudder bearings. EPA and DoD developed an upper bound estimate of the fleetwide release of oil and grease based on allowable leakage/washout rates and the amount of time each vessel spends within 12 n.m. from shore. The maximum allowable oil leak rate for oil-lubricated roller bearings is one gallon/day when the vessel is underway and one pint/day while in port. In practice, these leakage rates are not reached under normal conditions. The grease washout rate for grease-lubricated stave bearings is based on Navy specifications limiting grease washout to 5 percent. Grease washout estimates for this rule are based on releasing 5 percent of the grease over a two-week period, which corresponds to the time between grease applications.
EPA and DoD calculated the expected re ceiving water concentrations of oil and grease from this discharge to evaluate the potential for the discharge to cause adverse impacts. The underway receiving water volume was determined using an average size vessel and estimating the volume of water displaced by the vessel while transiting from port to a distance of 12 n.m. from shore. In port, discharges are not expected since the lower bearing seals are designed to prevent leakage and, as noted above, the oil to the bearings is kept at a low pressure while in port. The resulting estimated pollutant concentrations do not exceed acute Federal criteria or State acute water quality criteria. The rudder bearing lubrication discharge has a low potential for causing adverse environmental impacts. EPA and DoD determined that it is not reasonable and practicable to require a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.10 Steam Condensate
This discharge is the condensed steam discharged from a vessel in port, where the steam originates from shore-based port facilities. Navy and MSC surface ships often use steam from shore facilities during extended port visits to operate auxiliary systems such as laundry facilities, heating systems, and other shipboard systems. In the process of providing heat to ship systems, the steam cools and condenses. This condensate collects in drain collection tanks and is periodically discharged by pumping it overboard. The steam condensate is discharged above the vessel waterline and a portion of the condensate can vaporize as it contacts ambient air.
This discharge is generated only in port because vessels only discharge the condensed steam if it was generated by a shore facility. Ships producing their own steam will recycle their condensate back to the boiler. Vessels take on shore steam when their own boilers are shut down, and thus they have no means for reusing the condensate. There are no systems in place that would allow vessels to return steam condensate to shore for reuse.

Dep ending on the steam needs of individual vessels, the discharge can be intermittent or continuous whenever shore steam is supplied. Approximately 180 Navy and MSC vessels discharge steam condensate. Coast Guard vessels do not generate this discharge because they operate their auxiliary boilers to produce their own steam even while in port. Army and Air Force vessels do not have steam systems and therefore do not discharge steam condensate.5- 35



### The constituents of steam condensate include metals from onshore steam piping, ship piping, and heat exchangers, and may have some residual water treatment chemicals. Constituents found in the discharge include nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen), phosphorus, bis(2-ethylhexyl)phthalate, benzidine, copper, and nickel. Sampling of steam condensate from four vessels found copper concentrations that exceed both chronic Federal criteria and State chronic water quality criteria. Nickel concentrations exceeded the most stringent State chronic water quality criteria, but not the chronic Federal criteria. Benzidine, bis(2-ethylhexyl)phthalate, nitrogen (in the form of ammonia, nitrates and nitrites, and total Kjeldahl nitrogen), and phosphorus concentrations exceeded the most stringent State water quality criteria.
The potential for steam condensate to cause thermal environmental effects was evaluated by modeling the thermal plume generated by the discharge and then comparing the model results to State thermal discharge water quality criteria. Results of the modeling indicate that only the largest generator of steam condensate (an aircraft carrier) may exceed state thermal mixing zone criteria, and then, only in the State of Washington. The models predict that the thermal plume from an aircraft carrier moored at the pier in Bremerton, Washington would extend a distance of 80 m from the discharge port along the vessel hull, not extending past the end of the hull. The plume would also extend outward no more than a distance of 30 m from the vessel hull at any point along the hull. Results of the modeling indicate that the aircraft carrier may exceed Washington criteria in an area that only covers 5% of the width, 2% of the length, and 0.07% of the total surface area of Sinclair Inlet.
The EPA and DoD do not consider that the plume results in a significant environmental impact. Such a localized plume would have a low potential for interfering with the passage of aquatic organisms in the water body and would have a limited impact on the organisms that reside in the upper water layer (sea surface boundary layer). In addition, because the discharge is freshwater (no salinity) and warmer than the receiving water, the plume floats in the surficial layer of the water body and has no impact on bottom-dwelling organisms.
The low mass loadings in the discharge and the thermal effects modeling results indicate that steam condensate has a low potential for causing adverse environmental impacts. Therefore, EPA and DoD determined that it is not reasonable and practicable to require a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.11 Stern Tube Seals and Underwater Bearing Lubrication
This discharge is the seawater pumped through stern tube seals an d underwater bearings to lubricate and cool them during normal operation.
Propeller shafts are supported by stern tube bearings at the point where the shaft exits the hull (for surface ships and submarines), and by strut bearings outboard of the ship (for surface ships only). A stern tube seal is used to prevent seawater from entering the vessel where the shaft penetrates the hull. The stern tube seals and bearings are cooled and lubricated by forcing seawater from the firemain or auxiliary cooling water system through the seals and over the5- 36



### bearings. On submarines, potable water (freshwater) may be supplied from pierside connections for stern tube seal lubrication during extended periods in port.
Strut bearings are not provided with forced cooling or lubrication. Instead, strut bearings use the surrounding seawater flow for lubrication and cooling when the vessel is underway. Submarines do not have strut bearings and instead use a self-aligning bearing aft of the stern tube that supports the weight of the propeller and shafting outboard of the vessel.
Almost all classes of surface vessels and submarines have stern tube seals and bearings that require lubrication, and these discharges are continuous. The discharge can contain synthetic (Buna-N) rubber used in the construction of the bearings. Metals such as copper and nickel, the materials of construction of the stern tube, can also be present in the discharge. When freshwater is used for lubricating submarine seals, the freshwater may contain residual chlorine. Based on estimates of chlorine concentrations in potable water, fleetwide approximately 0.8 pounds/year of chlorine exit through the stern tube seals and bearings.
Total annual mass loadings for the metal constituents of seawater lubrica tion were calculated based on materials of construction in the stern tube, corrosion rates for those materials, and the surface area of the material exposed to seawater for a DDG 51 Class ship. While the copper concentrations can exceed chronic Federal criteria and State chronic water quality criteria, the rate at which the water is discharged through a vessel’s stern tube seal and bearings is relatively small - 20 gal/min each shaft, 2 shafts per ship -- resulting in a low pollutant mass loading exiting through the seals and bearings. Further, these discharges are distributed throughout the U.S. at Armed Forces ports, and each individual port receives only a fraction of the total fleetwide mass loading. Given the low rate of the discharge and the low mass loadings, this discharge has a low potential for causing adverse environmental impacts. Therefore, EPA and DoD determined it is not reasonable and practicable to require the use of a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.12 Submarine Acoustic Countermeasures Launcher Discharge
This intermittent discharge is composed of seawater that mixes with acoustic countermeasure device propulsion gas after launching an acoustic countermeasure device, and subsequently discharged either through exchange with the surrounding seawater or while draining from an expended device being removed from the submarine.
Navy submarines have the capability to launch acoustic countermeasures devices to improve the survivability of a submarine by generating sufficient noise to be observed by hostile torpedoes, sonars, or other monitoring devices. The only countermeasures systems that generate a discharge within 12 n.m. are the countermeasures set acoustic (CSA) Mk 2 systems, which launch the countermeasure devices by gas propulsion through a launch tube. Following the launch, a metal plate closes the launch tube forming a watertight endcap. To equalize pressure, a

one -way check valve allows water to flow into the tube after launch, b ut does not allow any of the water to be released through the opening. The launch tube cap contains three, 3/8 inch, bleed hole plugs that dissolve approximately three days after the launch. This allows exchange5- 37



### between the launch tube and the surrounding seawater while the submarine is moving. The bleed holes also allow some launch tube water to drain into the surrounding water when the assembly is removed from the submarine for replacement. The CSA Mk2 system is installed on 24 Navy submarines.

Con stituents found in the CSA Mk2 launch tubes after launching countermeasures devices include copper, cadmium, lead, and silver. The discharge may also contain constituents from the propulsion gas including hydrochloric acid, carbon dioxide, carbon monoxide, nitrogen, alumina, iron (II) chloride, titanium dioxide, hydrogen, and iron (II) oxide. Sampling indicates that copper, cadmium, and silver concentrations are above both Federal acute water criteria and the most stringent State acute water quality criteria; lead concentrations are above the most stringent State water quality criteria. The total annual mass loadings from all discharges from submarine CSA Mk2 countermeasure launcher systems are estimated at 0.0005 pounds/year cadmium, 0.0009 pounds/year lead, 0.0007 pounds/year copper, and 0.00009 pounds/year silver.
Because of the low annual mass loading, the low frequency at which the discharge occurs, and the volume of the individual discharge event (17 gallons), discharges from submarine CSA launcher systems have a low potential for causing adverse environmental impacts. Therefore EPA and DoD determined it is not reasonable and practicable to require a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.2.13 Submarine Em ergency Diesel Engine Wet Exhaust
This discharge is seawater that is mixed and discharged with exhaust gases from the submarine emergency diesel engine for the purpose of cooling the exhaust and quieting the engine.
Submarines are equipped with an eme rgency diesel engine that is also used in a variety of non-emergency situations, including electrical power generation to supplement or replace shore-supplied electricity, routine maintenance, and readiness checks. This wet exhaust discharge is generated by injecting seawater (or harbor water) as a cooling stream into the diesel engine exhaust system. The cooling water mixes with and cools the hot exhaust gases, and is discharged primarily as a mist that disperses in the air before depositing on the surface of the water body.
All submarines generate this discharge. Diesel engines must be operated for equipment checks that occur prior to submarine deployment, monthly availability assurance, and periodic trend analyses. On average, each submarine will operate the diesel engine for approximately 60 hours/year while within 12 n.m. from shore. Most of the operating time (54 hours/year) occurs while the submarine is pierside.
Typical constituents of diesel engine exhaust include various hydrocarbon combust ion by-products, measured as volatile and semi-volatile organic compounds. The priority pollutants expected to be present in the discharge include polycyclic aromatic hydrocarbons (PAHs), toluene, and possibly metals. Although no individual pollutant exceeds water quality criteria, the5- 38



### total concentration of PAHs in the discharge is predicted to exceed State acute water quality criteria. Nevertheless, the discharge of PAHs is unlikely to cause adverse impacts on the marine environment because the total fleetwide annual mass loading of PAHs is calculated to be less than 0.06 pounds/year. Therefore, EPA and DoD determined that it is not reasonable and practicable to require a MPCD to mitigate adverse impacts on the marine environment for submarine diesel engine wet exhaust.

5.2.14 Submarine Outboard Equipment Grease and External Hydraulics
This discharge occurs when grease applied to a submarine’s outboard equipment is released to the environment through the mechanical action of seawater eroding the grease layer while the submarine is underway, and by the slow dissolution of the grease into the seawater. This discharge also includes any hydraulic oil that may leak past the seals of hydraulically operated external components of a submarine (e.g., bow planes).
Outboard equipment grease is discharged by all submarines, but the discharge of oil from external hydraulic equipment is limited to 22 submarines. This discharge occurs continuously both within and beyond 12 n.m. from shore, although the rate of discharge depends upon the degree of contact between seawater and the greased outboard components, and how fast the submarine is traveling. Most hydraulically-operated outboard equipment, for example, does not contact seawater within 12 n.m. from shore because submarines generally operate on the surface in this region, and the hydraulically-operated equipment producing this discharge is located mostly above the waterline.
This discharge consists of grease (Termalene #2) and hydraulic oil. Termalene #2 consists of mineral oil, a calcium-based rust inhibitor, thickening agents, an antioxidant, and dye. Using an assumption that 100 percent of all grease applied to outboard equipment is washed away at a constant rate during submarine operations, the amount of grease released fleetwide within 12 n.m. is approximately 520 pounds/year. This value is believed to overstate the actual mass of grease discharged within 12 n.m. because submarines operate at lower rates of speed in coastal waters (thus leading to less erosion of the grease) and a surfaced submarine exposes a lesser amount of grease to the water than is exposed by a submerged submarine.
Hydraulic oil consists of paraffinic distillates and additives. Using a calculation that assumes all hydraulic system seals leak oil at the maximum allowable leak rate, approximately 0.4 pounds/year of hydraulic oil is released fleetwide within 12 n.m. from shore. (Based on discussions with Navy hydraulic system experts, such oil leakage rates are not common and thus this calculation overestimates the amount of oil actually leaked.) The submarine will displace approximately 120 million cubic feet of water as it travels within 12 n.m. from shore. Assuming that hydraulic oil and outboard grease are leaked at a constant rate, this will result in concentrations below the levels established in acute Federal criteria and State acute water quality criteria.
In addition, the turbulence created by the vessel wake is expected to result in rapid dispersion of the constituents released. As a result, the submarine outboard equipment grease5- 39



### and external hydraulics discharge has low potential for causing adverse environmental effects. EPA and DoD determined it is not reasonable and practicable to require a MPCD to mitigate adverse impacts on the marine environment for this discharge.

5.3 References
1. International Maritime Organization. “Guidelines for Preventing the Introduction of Unwanted Aquatic Organisms and Pathogens from Ships’ Ballast Water and Sediment Discharge.” 10 May 1995.GL- 1 

### GLOSSARY AND ABBREVIATIONS

AAV amphibious assault vehicle ABT aerostat balloon tender AC area command cutter AC anti-corrosive – as related to vessel hull coatings ACE armored combat earthmover Administrator the Administrator of the U.S. Environmental Protection Agency AE ammunition ship AF anti-fouling AFB air force base AFDB large auxiliary floating drydock AFDL small auxiliary floating drydock AFDM medium auxiliary floating drydock AFFF aqueous film-forming foam AFS combat store ship AG miscellaneous auxiliary AGER environmental research ship AGF miscellaneous command ship AGM missile range instrumentation ship AGOR oceanographic research ship AGOS ocean surveillance ship AGS surveying ship AGSS auxiliary research submarine AH hospital ship AKR vehicle cargo ship Amps amperes Anode the site at which oxidation occurs in an electrochemical cell ANB aids to navigation boat AO oiler AOE fast combat support ship AP area point system search craft APF afloat pre-positioning force APL barracks craft

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 2 

### APU auxiliary power unit AR repair ship ARC cable repairing ship ARD auxiliary repair dock ARDM medium auxiliary repair dock ARS salvage ship AS submarine tender ASR annual sedimentation rate ASTM American Society for Testing and Materials ASW anti-submarine warfare AT armored troop carrier ATC mini-armored troop carrier ATF fleet ocean tug
avg. average AWR army war reserve B barge BC dry cargo barge BCDK decked, enclosed conversion kit barge
BD floating crane
BDL below detection limit BG liquid cargo barge
BH boom handling boat
BK deck cargo barge
BMP best management practice BOD biochemical oxygen demand
BPL delong mobile piers
BRM refrigerated stores barge
BT bomb target
BU buoy utility boat BUSL stern loading buoy utility boat
BW boston whaler CA catamaran (also a gun cruiser, surface combatant) Cathode the site at which reduction occurs in an electrochemical cell CC cabin cruiser

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 3 

### CDNSWC (see NSWCCD) CFR Code of Federal Regulations CG guided missile cruiser CGN guided missile cruiser (non-conventional propulsion) CHT collection, holding and transfer (tank) CID commercial item description CM landing craft, mechanized Cm centimeter CNO Chief of Naval Operations COD chemical oxygen demand COE Corps of Engineers COMNAVAIRLANT Commander Naval Air Force, Atlantic Fleet COMNAVAIRPAC Commander Naval Air Force, Pacific Fleet COMNAVSURFLANT Commander Naval Surface Force, Atlantic Fleet COMNAVSURFPAC Commander Naval Surface Force, Pacific Fleet COPHOS coordinated phosphate treatment CORMIX Cornell mixing zone expert system CPO chlorine produced oxidants CPP controllable pitch propeller CRRC combat rubber raiding craft CT craft of opportunity coop trainer CU landing craft, utility CV multi-purpose aircraft carrier CVN multi-purpose aircraft carrier, non-conventional CWA Clean Water Act
DB distribution box boat
DBT dibutyltin DC direct current DC damage control
DD destroyer DDG guided missile destroyer
DFT dry film thickness
DoD Department of Defense DOT Department of Transportation

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 4 

### DSRV deep submergence rescue vehicle DSV deep submergence vehicle
DT diving tender
DW dive workboat EDTA ethylenediaminetetraacetic acid, a chelating agent
EE equipment expert EGT emergency gas turbine EOSS engineering operating sequencing systems EPA the U.S. Environmental Protection Agency ESC the UNDS Executive Steering Committee FAS fueling at sea
FB catamaran ferry FFG guided missile frigate FLO/FLO float-on/float-off vessel FMS floating machine shop
FR Federal Register
FR fouling rating FSS fast sealift ship G grams Gal gallons Gpm gallons per minute GRP glass reinforced plastic HC hydrocarbon
HEM hexane extractable materials HOPM hydraulic oil pressure module
HP horsepower I&S intelligence and security ICCP impressed current cathodic protection ILS integrated logistics services IMO International Maritime Organization INSURV board of inspection and survey
IX unclassified miscellaneous unit
J-Boat work and inspection boat
Kw kilowatt

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 5 

### L liter LA landing craft, assault LARC four-wheeled amphibious cargo vehicle LASH lighter-aboard-ship Lb pound LC landing craft LCAC landing craft, air cushion LCC amphibious command ship LCM landing craft, mechanized LCPL landing craft, personnel, large LCU landing craft, utility LCVP landing craft, vehicle, personnel
LH line handling boat LHA amphibious assault ship (general-purpose)
LHD amphibious assault ship (multi-purpose)
LPD amphibious transport dock
LPH amphibious assault ship (helicopter) LSD dock landing ship LST tank landing ship LSV logistics support vessel
LT large harbor tug MARAD Maritime Administration MARPOL international convention for the prevention of pollution from ships
MBT monobutyltin
MBT main ballast tank MC mine countermeasures support craft MCB motor cargo boat MCM mine countermeasures ship
MDL minimum detection limit
MDZ maritime defense zone
MEB marine expeditionary brigade
MERR metal element repair and restoration machine
μ g micrograms (one millionth of a gram)

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 6 

### Mg milligrams (one thousandth of a gram) Mgal million gallons Mgy million gallons per year MHC minehunter, coastal Min minute
ML motor launch
ML milliliter (one thousandth of a liter)
MLB motor life boat
MM marine mammal support craft
MNV mine neutralization vehicle MOGAS motor gasoline MPC maintenance procedure card MPCD marine pollution control device MPS maritime pre-positioning ship
MR missile retriever MRC major regional conflict MSB motor surf boat MSC Military Sealift Command MSD marine sanitation device MSDS material safety data sheet
MV motor vessel
MW motor whaleboat
MWT magnetic water treatment

n.m. nautical miles NAVSEA (or SEA) Naval Sea Systems Command NAVSTA naval station
NDRF National Defense Reserve Fleet
NDZ no-discharge zone NFAF Naval Fleet Auxiliary Force NFESC Naval Facilities Engineering Services Command
NFME naval fleet marine expeditionary (see MEB) NFO normal fuel oil
NL no limit
NM noise measuring boat

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 7 

### NOAA National Oceanic and Atmospheric Administration NOD nature of discharge NPDES national pollutant discharge elimination system
NraD Naval Research and Development Command
NRF Naval Reserve Fleet NS non-standard (commercial) boat NSTM naval ships’ technical manual NSWCCD Naval Surface Warfare Center, Carderock Division OCM oil content monitor OPNAVINST naval operations instruction manual OWHT oily waste holding tank OWS oil-water separator
P personnel boats PAH polynuclear aromatic hydrocarbon
PB patrol boat PB-HS patrol boat, harbor security
PBR river patrol craft PC patrol, coastal PCB polychlorinated biphenyl
PE personnel boat
PF patrol craft, fast PG patrol gunboat
PK picket boat
PL landing craft, personnel light PMS preventative maintenance system PMS planned maintenance system Ppb parts per billion Ppm parts per million
PR plane personnel and rescue PREPO pre-positioning ships Priority pollutants toxic pollutants designated in section 307(a) of the Clean Water Act
PSB port security boat Psi pounds per square inch

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 8 

### PT punt PWB ports and waterways boat
RB or RIB rigid inflatable boat
RHIB rigid hull inflatable boat
RHIL large rigid hull inflatable boat
RHIM medium rigid hull inflatable boat RIMSS redundant independent mechanical starting systems RO reverse osmosis RO/RO roll-on/roll-off type vessel ROS reduced operating status RRC rubber raiding craft
RRDF roll-on/roll-off discharge facilities
RRF Ready Reserve Fleet
RX rigid inflatable boat (non-standard) SB sound/sail SC support craft SCAMP submerged cleaning and maintenance platform SCC sample control center Secretary the Secretary of the U.S. Department of Defense SER sampling episode report SERC Smithsonian Environmental Research Center SES surface effects ship SESO Ships Environmental Support Office SGT silicone gel treated SLO synthetic lubricating oil SLWT side-loading warping tug SMSF special mission support force SRB surf rescue boat SRFO standard refueling, fuel oil SS steamship SS submarine, (also swimmer support) SSAP specific sampling and analysis plan SSBN ballistic missile submarine, non-conventional SSN submarine, non-conventional

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 9 

### ST sail training craft also small harbor tug SVOC semi-volatile organic compound
T-Boat small freight and supply vessel TACOM U.S. Army Tank-Automotive and Armaments Command TANB trailerable aids to navigation boat
TBT tributyltin TC training craft TCLP toxicity characteristic leaching procedure
TD target drone
TDD technical development document TDS total dissolved solids TG tugboat TOC total organic carbon
TPH total petroleum hydrocarbons
TR torpedo retriever TRC total residual chlorine TRO total residual oxidants TS training ship, State Maritime Academies TSS total suspended solids TWG technical working group
U utility boat
UB utility boat
UMI underway material inspections UNDS uniform national discharge standards
UNREP underway replenishment
UTB utility boat
UTL large utility boat VOC volatile organic compound
VP landing craft, vehicle personnel VSTOL vertical/short take-off and landing WAGB icebreaker
WB work boat Welldeck the docking well onboard amphibious warfare ships used to store landing craft

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 10 

### WH wherry WHEC high endurance cutter
WIX training cutter/sailing bark
WLB offshore buoy tender
WLI inshore buoy tender WLIC inland construction tender
WLM coastal buoy tender
WLR river buoy tender WMEC medium endurance cutter WOCT waste oil collection tank WOT waste oil tank
WPB patrol boat WQC water quality criteria
WT warping tug WTGB icebreaking tug
WYTL harbor tug, small
WYTM harbor tug, medium YC open lighter YCF car float YCV aircraft transportation lighter
YD floating crane
YDT diving tender
YFB ferryboat or launch
YFN covered lighter
YFNB large covered lighter
YFND drydock companion craft
YFNX lighter - special purpose
YFP floating power barge
YFRN refrigerated/covered lighter
YFRT covered lighter, range tender
YFU harbor utility craft YGN garbage lighter
YL yawl YLC salvage lift craft

### GLOSSARY AND ABBREVIATIONS (contd.)

GL- 11 

### YM dredge
YMN dredge YNG gate craft YO fuel oil barge YOG gasoline barge YOGN gasoline barge YON fuel oil barge YOS oil storage barge
YP patrol craft, training
YPD floating pile driver
YR floating workshop
Yr year YRB repair and berthing barge
YRBM repair, berthing and messing barge
YRDH floating drydock workshop, hull
YRR radiological repair barge YRST salvage craft tender YSD seaplane wrecking derrick YSR sludge removal barge
YTB large harbor tug
YTL small harbor tug
YTM medium harbor tug
YTT torpedo trials craft
YWN water barge

### A- 1 

### Appendix A Nature of Discharge (NOD) and Marine Pollution Control Device ( MPCD) Reports

### A- 2 

### Appendix A
Appendix A contains each of the 39 NOD reports, the contents of which are de scribed in section 4.3 of the main document. Reports are arranged alphabetically, in order of appearance. The title of each report may be found on the bottom center of each page. The following four MPCD practicability analyses are also included in this appendix, after the respective NOD reports:

• Distillation and Reverse Osmosis Brine;

• Hull Coating Leachate;

• Small Boat Engine Wet Exhaust; and

• Underwater Ship Husbandry
Refer to section 4.4 for a more detailed discussion of the process used to determine MPCD practicability.

### A- 3 

### Appendix A List of NOD and MPCD Reports (in order of appearance)
Aqueous Film-Forming Foam NOD Report Boiler Blowdown NOD Report Catapult Water Brake Tank and Post-Launch Retraction Exhaust NOD Report Catapult Wet Accumulator Discharge NOD Report Cathodic Protection NOD Report Chain Locker Effluent NOD Report Clean Ballast NOD Report Compensated Fuel Ballast NOD Report Controllable Pitch Propeller Hydraulic Fluid NOD Report Deck Runoff NOD Report Dirty Ballast NOD Report Distillation and Reverse Osmosis Brine NOD Report Distillation and Reverse Osmosis Brine MPCD Report Elevator Pit Effluent NOD Report Firemain Systems NOD Report Freshwater Lay-Up NOD Report Gas Turbine Water Wash NOD Report Graywater NOD Report Hull Coating Leachate NOD Report Hull Coating Leachate MPCD Report Mine Countermeasures Equipment Lubrication NOD Report Motor Gasoline Compensating Discharge NOD Report Non-Oily Machinery Wastewater NOD Report Photographic Laboratory Drains NOD Report Portable Damage Control Drain Pump Discharge NOD Report Portable Damage Control Drain Pump Wet Exhaust NOD Report Refrigeration /Air Conditioning Condensate NOD Report Rudder Bearing Lubrication NOD Report Seawater Cooling Overboard Discharge NOD Report Seawater Piping Biofouling Prevention NOD Report Small Boat Engine Wet Exhaust NOD Report Small Boat Engine Wet Exhaust MPCD Report Sonar Dome Discharge NOD Report Steam Condensate NOD Report Stern Tube Seals and Underwater Bearing Lubrication NOD Report Submarine Acoustic Countermeasures Launcher Discharge NOD Report Submarine Bilgewater NOD Report Submarine Emergency Diesel Engine Wet Exhaust NOD Report Submarine Outboard Equipment Grease and External Hydraulics NOD Report Surface Vessel Bilgewater/Oil-Water Separator Discharge NOD Report Underwater Ship Husbandry NOD Report Underwater Ship Husbandry MPCD Report Welldeck Discharges NOD Report

### Aqueous Film Forming Foam (AFFF) 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “..discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Aqueous Film Forming Foam (AFFF)

### Aqueous Film Forming Foam (AFFF) 2 2.0 DISCHARGE DESCRIPTION
This section describes the AFFF and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
AFFF is the primary firefighting agent used aboard U.S. Coast Guard (USCG) and Navy vessels for flammable liquid fires. A different class of agents, Fluoroprotein foams, are used for the same purpose on vessels in the Military Sealift Command (MSC). Aqueous Film Forming Foam (AFFF) is a particular type of synthetic firefighting foam whose performance is governed by military specification. Fluoroprotein foam is a protein-based material to which fluorinated surfactants have been added to improve fluidity and surface tension properties, while reducing the tendency of the protein base to absorb liquids.
These foams control and extinguish flammable liquid fires and help prevent such fires after spills by spreading a vapor-sealing film over the flammable liquid. The foam layer effectively excludes oxygen from the surface of the fuel, while the high water content cools the surface. The foam layer also provides a reservoir that will reseal a disturbed fuel surface and inhibit reignition. Both foams have excellent “wetting” or penetrating characteristics can be used against fires involving densely packed wood, wood products, cloth, textile and fibrous materials, paper, and paper products. Both types of foam concentrates can be stored for indefinite periods in approved equipment and systems with no degradation in chemical properties or capabilities.

In use, foam concentrate is mixed with seawater to form a dilute seawater foam solution. Seawater foam solution is generated in foam proportioning stations or by portable proportioners. 1 

### Each type involves metering foam concentrate into pressurized, firefighting seawater. The metering accuracy of the proportioning stations is verified by periodic tests.
Foam is applied both manually, with conventional foam or water/fog equipment such as fire hoses equipped with foam nozzles, and from fixed sprinkler devices. Fixed systems provide seawater foam solution to sprinklers on flight decks, and to overhead sprinklers in hangars, tank decks, well decks, weapon elevator pits, fueled vehicle decks or holds, refueling stations, and fuel pump rooms. If a protected area requires a greater flow rate than can be supplied by a single proportioning station, the area is subdivided into zones or groups, each independently supplied from a single proportioning station. Bilge sprinkler systems are installed in machinery spaces and pump rooms. Firefighting hose reel stations are supplied through a system of proportioners, pumps, and permanently installed piping.
Foam concentrate is stored in tanks, 55-gallon drums, and 5-gallon cans. Aircraft carriers, large amphibious ships, and other large ships can carry more than 20,000 gallons of AFFF or fluoroprotein foam concentrate.
Neither AFFF nor fluoroprotein foam is ever discharged from vessels in concentrated

### Aqueous Film Forming Foam (AFFF) 3 form. Only the dilute seawater foam solution is discharged. Incidental discharge of seawater foam solution occurs during maintenance that is part of the Planned Maintenance System (PMS), Board of Inspection and Survey (INSURV) underway material inspections (UMI), flight deck certifications, or biennial tests on MSC vessels by the USCG Office of Marine Inspection.
Regular preventive maintenance of firefighting systems and equipment requiring the discharge of seawater foam solution aboard ship occurs annually during PMS activities, although some maintenance is performed at 18 month intervals. Table 1 indicates the frequency of foam solution discharges on Navy, MSC, and USCG vessels. For Navy vessels, an INSURV UMI occurs every 3 years and involves the same system checks and resulting seawater foam discharges as the annual PMS activities. An MSC damage control instruction requires that foam solution be present at flight deck nozzles before every flight operation (approximately twice per month per vessel), which is verified by operating the nozzles until foam is sighted. 2 

### For aircraft carriers, Navy requirements call for a flight deck certification during the first deployment to sea after a shipyard or repair period (approximately every 1.5 years). Other than aircraft carriers, ships with flight decks, whether Navy or MSC, receive flight deck certification inspections every 3 years that test for foam solution at all flight deck nozzles and hoses.

2.2 Releases to the Environment
The seawater foam solutions that are discharged onto flight and weather decks as a result of maintenance, inspection, and certification activities are washed overboard with pressurized seawater from fire hoses, or by activating the seawater washdown system. Foam that is discharged into internal ship compartment bilges during system testing and flushing evolutions is pumped overboard by eductors.
Seawater foam discharge will contain all the constituents from the firemain, in addition to constituents unique to the foam concentrate. As discussed more fully in the Firemain Systems NOD Report, the principal constituent of the firemain discharge that could have an adverse water quality effect is copper, derived from the copper nickel firemain piping. Therefore, copper will be an expected component of the AFFF solution discharge.

2.3 Vessels Producing the Discharge
All Navy surface ships, all classes of USCG cutters, iceb reakers and icebreaking tugs, and MSC ship classes with the ability to support helicopter operations produce the discharge. Table 2 shows the vessel classes that produce the discharge.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

### Aqueous Film Forming Foam (AFFF) 4 3.1 Locality
The Navy provides instruction on where seawater AFFF solutions can be discharged during maintenance that tests the proportioning accuracy of AFFF proportioning stations. This test is commonly conducted by discharging an AFFF hose over the side, when beyond the 12 nautical mile (n.m.) limit. The PMS instructions state:
“Accomplish maintenance requirements only when ship is beyond 12 nautical miles of shore and preferably while underway. When within 3 nautical miles of shore or in port, discharge to a tank, barge or to an authorized truck. In other cases, when between 3 and 12 nautical miles, overboard discharge is permitted with a minimum (ship) speed of 10 knots.” 3-9



### Discharges that are part of inspections and certifications are not governed by the maintenance instruction, and can be discharged anywhere, except that seawater foam solution in a machinery space bilge is governed by bilge pumping rules, and cannot be discharged within 12

n.m. 10 

### In practice, the maintenance policy applies because a single discharge event will be scheduled to satisfy simultaneously the requirements for maintenance, inspection, and certification.

3.2 Rate
When testing the proportioning accuracy of proportioning stations, ships typically test one station at a time by discharging a foam hose over the side. This discharge rate is 125 gallons per minute (gpm) or 250 gpm, depending on the flow rate of the hose selected for the test. When testing or demonstrating flight deck sprinkling, the most common practice is to operate one or two zones at a time, continuing until all the zones have been tested. The nominal flow rate for each zone on Navy ships is 1,000 gpm, so the typical discharge rate is 2,000 gpm.

AFFF concentrate is mixed with seawater from the firemain to form a 6% dilute solution, that is, 100 gallons of solution contains 6 gallons of AFFF concentrate and 94 gallons of seawater. 1 

### The WTGB 140 Class of icebreaking tugs operated by the USCG use more concentrated base stock which is diluted to a 3% solution. Fluoroprotein foams are mixed on MSC ships in both 3% and 6% solutions, depending on the design of the installed proportioning equipment. 11 

### These mixing ratios are used in Table 2 to derive discharge quantities of foam concentrate and seawater.
After tests or demonstrations of flight deck sprinkling, the foam blanket is washed off using fire hoses, or by operating the fixed seawater washdown system. Both techniques result in a seawater discharge supplied from the firemain. The flow rate is variable, but a typical range is 250 gpm (two fire hoses on a ship with a helicopter landing platform) to 2,000 gpm (two flight deck zones on an aircraft carrier).
Tests or demonstrations of bilge sprinkling do not result in environmental discharges

### Aqueous Film Forming Foam (AFFF) 5 until bilges are pumped overboard. Bilges can be pumped within 12 n.m. of shore if the discharge is passed through oil water separators. However, the surfactants in AFFF and fluoroprotein foam render the oil water separators ineffective, so crews do not discharge seawater foam solution through their oil water separators. Accordingly, bilges containing seawater foam solution are pumped only beyond 12 n.m. from shore 10 

### . Therefore, this NOD report does not account for foam discharges attributable to bilge sprinkling, discharge of machinery space bilge hoses, nor the seawater used to wash and pump bilges.
By ship class, Table 2 shows the discharges of seawater foam solution, foam concentrate in the solution, seawater in the solution, and seawater used to wash the solution off the ship. All discharges are assumed to occur within 12 n.m. of shore. The fleetwide estimates are summarized in Table 3.

3.3 Constituents
The ingredients in foam concentrate are listed on material safety data sheets (MSDSs) prepared by the manufacturer. The AFFF concentrate produced by the principal Armed Forces supplier contains water, 2-(2-butoxyethoxy)-ethanol, urea, alkyl sulfate salts (2 in number), amphoteric fluoroalkylamide derivative, perfluoroalkyl sulfonate salts (5), triethanolamine, and methyl-1H-benzotriazole, with fresh water accounting for approximately 80% of the ingredients by weight (see Table 3). 12 

### Freshwater is the principal ingredient of all the foam concentrates used by the Armed Forces, comprising approximately 80% - 90% of the product by weight. 12-16 

### The protein base in fluoroprotein foam is nontoxic and biodegradable. The chemical identities and corresponding weight percents of the surfactants in AFFF and fluoroprotein concentrates are proprietary, but are stated by the manufacturers to be nontoxic in the quantities present in the manufactured product, and more benign when diluted with seawater to a 3% or 6% solution. Fluoroprotein foam and 3% AFFF used on MSC and USCG vessels contribute only 4% of the total volume of foam discharged annually from vessels.
No priority pollutants nor bioaccumulators are known to be present in the AFFF product or fluoroprotein foam concentrates used aboard vessels of the Armed Forces.
The firemain provides the seawater in the seawater foam solution. Metals and other materials from the firemain system can be dissolved by the seawater, and particles can be eroded and physically entrained in the seawater flow. Any wetted material in the firemain system can become a constituent of the firemain discharge. None of the potential constituents are known bioaccumulators. The priority pollutants in the discharge are bis(2-ethylhexyl) phthalate, copper, nickel, and iron, which are found in the piping of wet firemain systems.
The piping in Navy AFFF systems is made of copper nickel alloy, the same as used in the firemain system. Total nitrogen, bis(2-ethylhexyl) phthalate, copper, nickel, and iron from this source will be constituents of the discharge.

3.4 Concentrations

### Aqueous Film Forming Foam (AFFF) 6 Table 3 shows the concentrations of the chemical constituents in AFFF concentrate. The data are based on the type of concentrate that is most widely used. Table 3 also shows the concentrations in the seawater foam solution.
Seawater foam discharges have not been part of the sampling program. The concentrations of total nitrogen, bis(2-ethylhexyl) phthalate, copper, nickel, and iron contributed from the AFFF system are not known. AFFF concentrate includes corrosion inhibitors.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of constituents in the discharge are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
Discharge quantities in Table 2 and constituent concentrations in Table 3 are combined to estimate mass loadings.
Based on the approximate mass of 366,000 pounds of AFFF concentrate discharged annually from Navy and USCG vessels, and the weight percentages of AFFF constituents, upper bound estimates of the annual mass loadings for the constituents range from a maximum of approximately 38,500 pounds for 2-(2-butoxyethoxy)-ethanol to a minimum of 370 pounds for methyl-1H-benzotriazole. The mass loadings resulting from 3% AFFF and fluoroprotein foam discharges aboard MSC vessels do not significantly change the calculated loadings because the total volume of these concentrates represents 4.0% of the foam discharged annually.

Th e annual mass loadings of copper, nickel, and iron from the firemain system are shown in Table 3, based on a total of 4,924,000 gallons of seawater used to produce foam and wash it off the ship after the test.

4.2 Environmental Concentrations
As listed in Table 2, individual constituent concentrations in foam range from 6,400 mg/L for 2-(2-butoxyethoxy)-ethanol down to about 61 mg/L for methyl-1H-benzotriazole. The concentrations presented represent AFFF seawater foam constituent concentrations in the product as discharged from hose nozzles and sprinkler heads aboard ship. These concentrations do not take into account the additional diluting effect of any seawater used to wash the AFFF seawater solution overboard. Thus, the concentration of the constituents in AFFF seawater solutions is reduced when this additional dilution factor is considered. Further, the ship’s motion through the sea causes the discharge to be distributed along the ship’s track, instead of being discharged in a single spot. Upon discharge to the environment, AFFF concentrate has been diluted 94:6 (about

### Aqueous Film Forming Foam (AFFF) 7 16:1) by the proportioning process, with further dilution during the wash-off procedure, followed by rapid dispersion in the wake of a moving ship.
AFFF could potentially be discharged from vessels in amounts that cause visible foam floating on the water surface. Floating foam detracts from the appearance of surface waters and can violate aesthetic water quality criteria. Several states have standards to prevent “floating

The bis(2-ethylhexyl) phthalate, copper, nickel, and iron constituents are the only priority pollutants sampled which exceed acute water quality criteria. Table 4 shows the concentration of the constituents of firemain water, total nitrogen, bis(2-ethylhexyl) phthalate, copper, nickel, and iron, that exceed acute water quality criteria. The copper concentration exceeds both the Federal and most stringent state criteria while the total nitrogen, bis(2-ethylhexyl) phthalate, nickel, and iron concentrations exceed only the most stringent state criterion.

4.3 Potential for Introducing Non-Indigenous Species
AFFF and fluoroprotein concentrates do not include biota. Seawater foam discharge can include microbial and invertebrate marine organisms, since biofouling accumulates in firemain systems, wet and dry types. See the Firemain Systems NOD Report for a discussion of the potential for introducing non-indigenous species in the firemain discharge.

5.0 CONCLUSION
AFFF discharges from vessels of the Armed Forces have the potential to cause an adverse environmental impact. There is currently an operational policy and procedure that prohibits any overboard discharge of AFFF from Navy vessels within 3 n.m. of shore, and stipulates that discharge could only occur at a minimum speed of 10 knots between 3 and 12 n.m. from shore. If this policy were not in place, the discharge could deposit significant amounts of foam on surface water. This foam would diminish the visual quality of the water.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information was used to estimate the volume of discharge

. Based on this estimate and on the reported constituent percentages by weight, the concentrations of the AFFF constituents in this discharge were then estimated. Table 5 shows the sources of the data used to develop this NOD report.

Specific References

1. Naval Ships’ Technical Manual (NSTM), Chapter 555, Vol. 1, Revision 4, page s 1-23, 2-

### Aqueous Film Forming Foam (AFFF) 8 6, 2-7, 4-22, and 4-23, Surface Ship Firefighting. 8 December 1997.

2. Military Sealift Command (MSC), Damage Control Manual, COMSCINST 3541.5D, 21 February 1994, page 1-10-2.

3. Naval Sea Systems Command (NAVSEA), Navy PMS Maintenance Index Page (MIP) 5551/026-C5, Fire Extinguishing System, Fog, Foam, and AFFF, December 1995.

4. Naval Sea Systems Command (NAVSEA), Navy PMS Maintenance Index Page (MIP) 5551/027-C6, Fire Extinguishing System, Fog, Foam, and AFFF, December 1996.

5. Naval Sea Sy stems Command (NAVSEA), Navy PMS Maintenance Index Page (MIP) 5551/029-86, Fire Extinguishing System, Fog, Foam, and AFFF, August 1996.

6. Naval Sea Systems Command (NAVSEA), Navy PMS Maintenance Index Page (MIP) 5551/031-C5, Fire Extinguishing System, Fog, Foam, and AFFF, December 1995.

7. Naval Sea Systems Command (NAVSEA), Navy PMS Maintenance Index Page (MIP) 5551/034-A4, Fire Extinguishing System, Fog, Foam, and AFFF, October 1994.

8. Naval Sea Systems Command (NAVSEA), Navy PMS Maintenance Index Pa ge (MIP) 5551/036-A4, Fire Extinguishing System, Fog, Foam, and AFFF, October 1994.

9. Naval Sea Systems Command (NAVSEA), Navy PMS Maintenance Index Page (MIP) 5551/037-37, Fire Extinguishing System, Fog, Foam, and AFFF, March 1997.

10. Office of Chief of Naval Operations (OPNAV), Environmental and Natural Resource Program Manual, OPNAVINST 5090.1B, 1 November 1994.

11. Weersing, Penny, Military Sealift Command Central Technical Activity. Design of Fire Protection Systems on MSC Ships, 26 March 1997, David Eaton, M. Rosenblatt & Son, Inc.

12. 3M Material Safety Data Sheet, FC-206CF LIGHT WATER TM 

### Brand Aqueous Film Forming Foam, November 13, 1995.

13. Ansul Inc. Material Safety Data Sheet, Ansulite 6% AFFF (AFC-5), May 19, 1995.

14. Chubb National Foam Inc. Material Safety Data Sheet, Aer-0-Water 6EM, March 27, 1991.

15. National Foam Inc. Material Safety Data Sheet, Aer-0-Foam XL-3 3%, October 2, 1996.

16. Ansul Inc. Material Safety Data Sheet, Ansul 3% Fluoroprotein Foam Concentrate, June 2, 1997.

17. Poidinger, Joe, 3-M Corp. MSDS 6% AFFF Concentrate Density, 18 September 1997,

### Aqueous Film Forming Foam (AFFF) 9 Anil Giri, M. Rosenblatt & Son, Inc.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).

### Aqueous Film Forming Foam (AFFF) 10 Coast Guard Uniform Maintenance Card R-A-012, Damage Control, Auxiliary, Fire Extinguishing System, AFFF system.
Darwin, Robert, NAVSEA 03G2. “AFFF Overboard Discharge.” M. Rosenblatt & Son, Inc. Crystal City, VA. 17 September 1996.
UNDS Ship Database, August 1, 1997.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.Table 1. Frequency of AFFF Discharge Events

Months 12 18 24 30 36 42 48 54 60 66 72 USCG Ships PMS - annual X X X X X X FD Cert - triennial X X Hose: 3 times in 3 years Flt dk: 1 time in 3 years
MSC Ships PMS - annual X X X X X X USCG - biennial X X X FD Cert - triennial X X INSURV - triennial X X Hose: 9 times in 6 years Flt dk: 7 times in 6 years

T-AKR Class Foam maker: 7 times in 6 years Hose: 9 times in 6 years Flt Dk: 7 times in 6 years

LPH Class PMS - 18 months X X X X FD Cert - triennial X X INSURV - triennial X X Hose: 3 times in 3 years Flt Dk: 2 times in 3 years

CV/CVN Classes PMS - 18 months X X X X FD Cert - 18 months X X X X INSURV - triennial X X Hose: 3 times in 3 years Flt Dk: 3 times in 3 years
Other Navy Classes PMS - annual X X X X X X FD Cert - triennial X X INSURV - triennial X X Hose: 4 times in 3 years Flt Dk: 2 times in 3 years

Notes for Table 1:

1. PMS discharges are scheduled by the ship. The ships are assumed to schedule their PMS maintenance tests to coincide with a demonstration required by an off-ship inspection team, when possible. The tests that satisfy off-ship inspection teams are assumed to be separate, not combined.

2. PMS tests are required annually, although, for some ships the periodicity is 18 months. Flight deck certification is required on all air capable ships every 3 years, except for aircraft carriers additional certifications are required after industrial work on the flight deck; the assumed average periodicity for aircraft carriers is every 18 months. INSURV underway material inspections are required every 3 years, only on Navy and MSC ships. For MSC ships, the USCG Office of Marine Inspection requires demonstration of foam making capability every 2 years.

3. Data are derived from references 2, and 3-9.Table 2. Annual Discharge Due to Tests, Inspections And Certifications

The Number The Number The Discharge Solution Solution Foam Seawater Clean-up Ship Of Armed of Foam Events Disch. Per Disch. per Con. Disch. Disch. Seawater Class Ships Force Foam Dispensing Per Year Station per Class Per Class Per Class Per Class

Per Class Owner Stations Means Per Station Event (gal) (gal) (gal) (gal) (gal) (See Table 1) (See Note 3) (See Note 4) (See Note 4) (See Note 4) (See Note 5) WAGB 1 USCG 1 Hose 1 125 125 8 118 0 WAGB 2 USCG 1 Hose 1 125 250 15 235 0 WHEC 12 USCG 2 Hose 1 125 3000 180 2820 0 WMEC 31 USCG 1 Hose 1 125 3875 233 3643 0 WTGB 9 USCG 1 Hose 1 125 1125 34 1058 0 T-AE 26 8 MSC 2 Hose 1.5 125 3000 180 2910 0

8 MSC 2 Fl. Dk 1.167 353 6599 396 6203 54989 T-AFS 1 8 MSC 2 Hose 1.5 311 7459 448 7012 0

8 MSC 2 Fl. Dk 1.167 350 6529 392 6137 54410 T-AGOS 1 5 MSC 1 Hose 1.5 125 938 56 881 0 19 4 MSC 1 Hose 1.5 125 750 45 705 0 T-AGS 26 2 MSC 1 Hose 1.5 125 375 23 353 0 T-AGS 45 1 MSC 1 Hose 1.5 125 188 11 176 0 T-AGS 51 2 MSC 1 Hose 1.5 125 375 23 353 0 T-AGS 60 4 MSC 1 Hose 1.5 125 750 45 705 0 T-AH 19 2 MSC 1 Hose 1.5 384 1152 69 1083 0

2 MSC 1 Monitor 1.167 500 1167 70 1097 9725 T-AKR 11 MSC 2 Foam Mkr. 1.167 107 2747 82 2665 22893

11 MSC 2 Hose 1.5 125 4125 124 4001 0 11 MSC 2 Fl. Dk. 1.167 1707 43826 1315 42511 365213 T-AO 187 12 MSC 2 Hose 1.5 125 4500 270 4230 0

12 MSC 2 Fl. Dk. 1.167 360 10083 605 9478 84024 T-ARC 7 1 MSC 1 Hose 1.5 125 188 11 176 0

1 MSC 1 Fl. Dk. 1.167 360 420 25 395 3501 T-ATF 166 7 MSC 1 Hose 1.5 125 1313 79 1234 0

7 MSC 1 Fl. Dk. 1.167 125 1021 61 960 8509 AGF 11 2 NAVY 4 Hose 1.33 125 1330 80 1250 0

2 NAVY 4 Fl. Dk. 0.67 1021 5470 328 5142 45587 AGOR 21 1 NAVY 1 Hose 1.33 125 166 10 156 0

1 NAVY 1 Fl. Dk. 0.67 0 0 0 0 0Table 2. Annual Discharge Due to Tests, Inspections And Certifications

The Number The Number The Discharge Solution Solution Foam Seawater Clean-up Ship Of Armed of Foam Events Disch. Per Disch. per Con. Disch. Disch. Seawater
Class Ships Force Foam Dispensing Per Year Station per Class Per Class Per Class Per Class

Per Class Owner Stations Means Per Station Event (gal) (gal) (gal) (gal) (gal) (See Table 1) (See Note 3) (See Note 4) (See Note 4) (See Note 4) (See Note 5)
AGOR 23 2 NAVY 1 Hose 1.33 125 333 20 313 0

2 NAVY 1 Fl. Dk. 0.67 0 0 0 0 0 AO 177 5 NAVY 2 Hose 1.33 125 1663 100 1563 0

5 NAVY 2 Fl. Dk. 0.67 273 1829 110 1719 15243 AOE 1 4 NAVY 2 Hose 1.33 125 1330 80 1250 0

4 NAVY 2 Fl. Dk. 0.67 464 2489 149 2339 20738 AOE 6 3 NAVY 3 Hose 1.33 125 1496 90 1406 0

3 NAVY 3 Fl. Dk. 0.67 374 2258 135 2123 18817 ARS 50 4 NAVY 1 Monitor 1 1000 4000 240 3760 0

4 NAVY 1 Hose 1 250 1000 108 892 0 AS 33 1 NAVY 2 Hose 1.33 125 333 20 313 0

1 NAVY 2 Fl. Dk. 0.67 270 362 22 340 3015 AS 39 3 NAVY 2 Hose 1.33 125 998 60 938 0

3 NAVY 2 Fl. Dk. 0.67 314 1261 76 1185 630 CG 47 27 NAVY 3 Hose 1.33 125 13466 808 12658 0

27 NAVY 3 Fl. Dk. 0.67 170 9212 553 8659 76765 CGN 36 2 NAVY 2 Hose 1.33 125 665 40 625 0

2 NAVY 2 Fl. Dk. 0.67 144 386 23 363 3216 CGN 38 1 NAVY 2 Hose 1.33 125 333 20 313 0 59/63/65 4 NAVY 17 Hose 1 250 17000 1836 15164 0

4 NAVY 17 Fl. Dk. 1 1000 68000 4080 63920 566667 CVN 65/68 8 NAVY 16 Hose 1 250 32000 1920 30080 0 CVN 65/68 8 NAVY 20 Fl. Dk. 1 1000 160000 9600 150400 1333333 DDG 963 31 NAVY 2 Hose 1.33 125 10308 618 9689 0

31 NAVY 2 Fl. Dk. 0.67 130 5416 325 5091 45133 DDG 51 18 NAVY 2 Hose 1.33 125 5985 359 5626 0

18 NAVY 2 Fl. Dk. 0.67 210 5065 304 4761 2533 DDG 993 4 NAVY 2 Hose 1.33 125 1330 80 1250 11083

4 NAVY 2 Fl. Dk. 0.67 130 699 42 657 349Table 2. Annual Discharge Due to Tests, Inspections And Certifications

The Number The Number The Discharge Solution Solution Foam Seawater Clean-up Ship Of Armed of Foam Events Disch. Per Disch. per Con. Disch. Disch. Seawater
Class Ships Force Foam Dispensing Per Year Station per Class Per Class Per Class Per Class

Per Class Owner Stations Means Per Station Event (gal) (gal) (gal) (gal) (gal) (See Table 1) (See Note 3) (See Note 4) (See Note 4) (See Note 4) (See Note 5) FFG 7 43 NAVY 2 Hose 1.33 125 14298 858 13440 0

43 NAVY 2 Fl. Dk. 0.67 182 10510 631 9879 87582 IX 308 2 NAVY 1 Hose 1.33 125 333 20 313 0 IX 35 2 NAVY 1 Hose 1.33 125 333 20 313 0 IX 501 1 NAVY 1 Hose 1.33 125 166 10 156 0 LCC 19 2 NAVY 2 Hose 1.33 125 665 40 625 0

2 NAVY 2 Fl. Dk. 0.67 320 857 51 805 7140 LHA 1 5 NAVY 12 Hose 1.33 250 19950 1197 18753 0

5 NAVY 12 Fl. Dk. 0.67 1000 40200 2412 37788 335000 LHD 1 4 NAVY 12 Hose 1.33 250 15960 958 15002 0

4 NAVY 12 Fl. Dk. 0.67 1000 32160 1930 30230 268000 LPD 4 8 NAVY 4 Hose 1.33 125 5320 319 5001 0

8 NAVY 4 Fl. Dk. 0.67 1021 21882 1313 20569 182347 LPH 2 2 NAVY 10 Hose 1 250 5000 540 4700 0

2 NAVY 10 Fl. Dk. 0.67 1000 13400 804 12596 111667 LSD 36 5 NAVY 4 Hose 1.33 125 3325 200 3126 0

5 NAVY 4 Fl. Dk. 0.67 365 4888 293 4595 40736 LSD 41 8 NAVY 4 Hose 1.33 125 5320 319 5001 0

8 NAVY 4 Fl. Dk. 0.67 936 20068 1204 18864 167232 LSD 49 3 NAVY 4 Hose 1.33 125 1995 120 1875 0

3 NAVY 4 Fl. Dk. 0.67 936 7525 452 7074 62712 LST 1179 3 NAVY 1 Hose 1.33 125 499 30 469 0

3 NAVY 1 Fl. Dk. 0.67 216 434 26 408 3618 MCM 1 14 NAVY 1 Hose 1.33 125 2328 140 2188 0 MHC 51 12 NAVY 1 Hose 1.33 125 1995 120 1875 0 PC 1 13 NAVY 1 Hose 1.33 125 2161 130 2032 0

13 NAVY 1 Fl. Dk. 0.67 162 1408 85 1324 11737 Misc. (See Note 6) 30 MSC N/A N/A N/A N/A 27500 1650 25850 220000 TOTAL 722537 42902 679931 4244144

### Table 2. Annual Discharge Due to Tests, Inspections And Certifications

Notes for Table 2:
1. Values in this table are upper bound estimates, because all discharge is assumed to occur within 12 n. m. of shore.
2. Discharges are due to maintenance tests of the proportioning accuracy of the foam proportioners, to demonstrations of foam making capability for flight deck certification teams, and to demonstrations of foam making capability for the Board of Inspection and Survey. Discharges to bilges, by hose nozzles or fixed sprinklers, are not tabulated because the foam solution is not pumped overboard within 12 n.m. of shore.
3. The discharge flow through hoses is 125 gpm or 250 gpm, depending on the ship's installed equipment. The discharge rate through fixed flight deck sprinklers is .06 gpm/ft2 X Flight Deck area. For aircraft carriers, and the big deck amphibious ships, LHD, LHA, and LPH, flight deck discharge is calculated at 1000 gpm per zone.
4. Total hose flow is No. of ships X No. of stations per ship X Hose nozzle flow rate X 1 minute. Foam is 6% of total flow, and seawater is 94% of total flow rate. For ships with fixed speed foam injection pumps, foam flow is 27 gpm and seawater flow = total flow - 27 gpm. Total flight deck flow is No. of ships X flight deck area X .06 gpm/ft2 X 1 minute. For aircraft carriers and the big deck amphibious ships, LHD, LHA, and LPH, the total flow is No. of ships X No. of zones per ship X 1000 gpm per zone X 1 minute. For both cases, foam is 6% of total flow, and seawater is 94% of total flow. For WTGB and T- AKR Class ships foam is 3% of total flow and seawater is 97% of total flow; these ships use a more concentrated foam concentrate than other ships.
5. The flow from demonstrations and tests of flight deck hoses is directed over the side. No seawater is needed for clean up. The flow through fixed flight deck sprinklers is cleaned off the ship by seawater from the firemain, either through hose nozzles or the fixed flight deck sprinklers. As an average figure to account for both options, the cleanup flow is assumed to be .05 gpm/ft2, or 833 gpm per zone, flowing for 10 minutes.

6. Aboard MSC ships with helicopter landing capabilities, the presence of foam must be demonstrated at flight deck nozzles and hoses before each flight operation. Assuming two such operations per month per ship, the total annual discharge of fluoroprotein foam concentrate for the 30 ships involved is 30 ships X 55 gallons foam concentrate per ship per year, which equals 1650 gallons/year. The concentrate is assumed to be 6% of the total flow, so the total flow of solution is 1650/.06 or 27,500 gallons of seawater foam solution per year. The water portion is assumed to be 94% of the total flow. Cleanup seawater flow is assumed to be eight times the total solution flow, or 220,000 gallons.
7. To perform a maintenance test of the proportioning accuracy of a proportioning station, foam solution will be directed over the side via a hose nozzle rated at 125 gpm or 250 gpm, depending on the ship's installed equipment. Test is assumed to require 1 minute of flow.
8. To demonstrate foam-making ability for an off-ship inspection team, foam will be discharged over the side through hose nozzles and onto the flight deck through the fixed sprinklers. Demonstration is assumed to require 1 minute of flow.
9. Data are derived from Table 1 , specific references 1, 2, 11, and general references.

### Table 3. Upper Bound Estimates of Annual Mass Loading and Constituent Concentrations Due to AFFF Discharge Annual discharge of AFFF/seawater solution, gals 722,500 Annual discharge of AFFF concentrate, gals 42,900 Annual discharge of AFFF concentrate, lbs 366,366 8.54/lb/gal density Annual discharge of seawater in the solution, gals 680,000 Annual discharge of cleanup seawater, gals 4,244,000 Annual discharge of seawater, including cleanup, gals 4,924,000

Mass Loading Concentration
Constituent Wt % Low Wt %

High Low (lb) High (lb) Low

mg/L High

mg/L
Fresh water 78.0% 81.0% 286,000 297,000 47,400 49,200 2-(2-butoxyenthoxy)-ethanol 9.5% 10.4% 34,800 38,500 5,800 6,400

urea 3.0% 7.0% 11,000 25,600 1,800 4,300 alkyl sulfate salts (2) 1.0% 5.0% 3,700 18,300 610 3,040 amphoteric fluoroalkylamide derivative 1.0% 2.0% 3,700 7,300 610 1,220 perfluoroalkyl sulfonate salts (5) 0.1% 1.0% 370 3,700 61 610

triethanolamine 0.1% 1.0% 370 3,700 61 610 methyl-1H-benzotriazole 0.0% 0.1% 0 370 0 61
Constituent Concentration Mass Loading Total nitrogen 500 μ g/L 16.8 lb Bis(2-ethylhexyl) phthalate in seawater 22 μ g/L 0.74 lb Copper in seawater 45.59 μ g/L 1.87 lb

Nickel in seawater 15.24 μ g/L 0.62 lb

Iron in seawater 21.28 μ g/L 0.87 lb

Notes:
1. Conversion: 1 μ g/L = 8.345 X 10 -9 lb/gal 2. Concentrations in mg/L are for the diluted AFFF/seawater solution. The concentrations are accurate for hoses discharged over the side, but overstated by about 30% for flight deck discharges which are washed over the side with additional seawater. Calculation is pounds of constituent, divided by gallons of discharged solution, and converted to mg/L. 3. Data derived from Table 2, and References 12, 17.

### Table 4. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituents Log-normal

Mean Effluent Minimum

Concentration Effluent Maximum

Concentration Effluent Federal

Acute WQC Most Stringent

State Acute WQC

Classicals ( μ g/L) Total nitrogen 500 None 200 (HI) A Organics ( μ g/L) Bis(2-ethylhexyl) phthalate 22 BDL 428 None 5.92 (GA)

Metals ( μ g/L) Copper Dissolved 24.9 BDL 150 2.4 2.4 (CT, MS) Total 62.4 34.2 143 2.9 2.5 (WA) Iron Total 370 95.4 911 None 300 (FL) Nickel Total 15.2 BDL 52.1 74.6 8.3 (FL, GA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values.

CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington



### Table 5. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation NSTM Ch 555 X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality PMS Cards X 3.2 Rate X X 3.3 Constituents X 3.4 Concentrations MSDS Sheets 4.1 Mass Loadings X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X X

### Boiler Blowdown 1 NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Boiler Blowdown

### Boiler Blowdown 2 2.0 DISCHARGE DESCRIPTION
This section describes boiler blowdown and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
There are two ways to produce steam for use on ships: conventionally powered boilers and nuclear powered ship steam generators. Conventionally powered boilers and nuclear powered ship steam generators are discussed separately in this report.

2.1.1 Conventionally Powered Ship Boiler Blowdown
Boilers are used to produce steam for the majority of surface vessels that have steam systems. Aboard conventionally powered steam ships, the main propulsion boilers supply steam at high pressure and temperature to the main propulsion turbines, ship service turbogenerators, and a host of auxiliary and hotel services. Many gas turbine and diesel-powered ships have auxiliary or waste heat boilers that produce steam at relatively low pressure for hotel services.
The water supplied to the boiler system (feedwater) is treated to minimize the formation of scale and to inhibit corrosion in the boiler and boiler system piping. All main propulsion boilers in the Navy now use the chelant treatment system, which replaced the coordinated phosphate (COPHOS) treatment system used in main propulsion boilers. 1 

### Main and auxiliary boilers of the Military Sealift Command (MSC) ships use boiler feedwater chemistry prescribed by the original equipment manufacturer. 2 

### Auxiliary boilers aboard U.S. Coast Guard (USCG) vessels are treated in accordance with USCG instructions. 3



### The process of boiling water to make steam creates higher concentrations of particulates (the result of corrosion products and sludge forming minerals in the boiler water) and chemicals in the boiler water. The feedwater that is added to maintain the water level in the boiler (boiler water) has a lower concentration of chemicals and dilutes the chemical concentrations that develop during steam generation. Even with careful boiler water treatment management, water or a water/steam mixture must be periodically released from the boiler to remove particulates and sludge and to control boiler water chemical treatment concentrations. This process is referred to as a "boiler blowdown." Blowdowns are accomplished by releasing controlled amounts of boiler water through sea connections that exit the ship below the waterline.
There are four types of boiler blowdown procedures: surface blowdown, scum blowdown, bottom blowdown, and continuous blowdown. Surface blowdowns are used to remove particulates and dissolved materials in the boiler water and to control boiler water chemistry. If contamination or boiler water treatment chemical over-addition exist, both are reduced by a surface blowdown. Scum blowdowns are used to remove surface scum. Bottom blowdowns are used to control the amount of sludge in the boiler water. Continuous blowdowns

### Boiler Blowdown 3 are used in all chelant treatment systems to rid the boiler of dissolved metal chelates and suspended matter. 1 

### All boiler blowdowns are performed in accordance with published guidance.
In all cases, except bottom blowdown, blowdowns can be conducted while the boiler is operating. Bottom blowdowns for propulsion and auxiliary boilers are conducted only when the boiler is secured. 1 

### Waste heat boiler bottom blowdowns can be conducted while the boiler is operating. The four boiler blowdown procedures are conducted in the following ways:

• Surface blowdowns discharge approximately five percent of the total volume of water in the boiler. 4,5 

### During a surface blowdown, the water level in the boiler is increased three to four inches, the surface blowdown valve is opened and then closed when the boiler empties to the normal water level.

• Scum blowdowns discharge approximately one percent of the total volume of water in the boiler. 4,5 

### During a scum blowdown, the water level in the boiler is increased by one inch and the surface blowdown valve is opened and then closed when the boiler empties to the normal water level. 1



### • Bottom blowdowns discharge approximately ten percent of the total volume of water in the boiler. 4,5 

### For a bottom blowdown, the water level in the boiler is increased six inches, the bottom blowdown valve is opened and then closed when the boiler empties to the normal water level. 1



### • Continuous blowdowns discharge approximately four percent of the total volume of water in the boiler per day. 5,6 

### This discharge flows to the bilge of the vessel. Thus, continuous blowdowns are not considered in the total blowdown volume in this report and are covered by the Surface Vessel Bilgewater/OWS Discharge NOD Report.
Ships normally receive steam and electrical power from the pier while they are in port during extended upkeep periods. However, there are occasions when a steam powered ship can have a main propulsion boiler operating in port or at anchor for the operation of a turbogenerator set and to provide hotel service steam. Auxiliary boilers can also be operated in port to provide hotel service steam. When a boiler is secured in port (laid-up), one of six different methods is used. Only one of these methods, placing the boiler under a steam blanket, results in boiler blowdowns. A secured boiler is placed under a steam blanket by keeping steam continuously applied to the boiler. This steam can be from shore or from an operating boiler on the ship. The steam blanket excludes oxygen, thereby minimizing the potential for corrosion in the boiler. Boilers under a steam blanket require a blowdown because the steam applied to the boiler condenses and increases the boiler's water level. A blowdown returns the water to its proper level.

### Boiler Blowdown 4 2.1.1.1 Chelant Feedwater Treatment
The chelant system adds ethylenediaminetetraacetic acid (EDTA) to the boiler feedwater in powder form. Only distilled water is used as feedwater in the system. EDTA reacts with metal ions and forms soluble metal chelates (that do not precipitate) that are removed during blowdowns. 7 

### This helps reduce boiler scaling by removing calcium and magnesium. Hydrazine is used to eliminate residual dissolved oxygen in the feedwater, thus inhibiting the corrosive effects of oxygen in the boiler.

2.1.1.2 Coordinated Phosphate Chemistry
COPHOS systems treat the feedwater to the boiler to reduce boiler scale and corrosion, thus ensuring boiler system reliability. COPHOS systems also use only distilled water as feedwater. Chemicals such as trisodium phosphate, disodium phosphate, and sodium hydroxide are used to precipitate scale forming magnesium and calcium. 1



### Auxiliary and waste heat boilers on Navy ships use a feedwater chemical treatment system similar to COPHOS. This system uses disodium phosphate to reduce boiler corrosion and scale. 1



### 2.1.1.3 Drew Ameroid Chemistry
Drew Ameroid systems treat the feedwater to the boiler with disodium phosphate, sodium hydroxide, and morpholine to control scale and corrosion in the boiler. Main propulsion boilers aboard MSC ships, operating at pressures greater than 850 pounds per square inch (psi), use the Drew Ameroid “Ultra Marine” system of treatment. Main propulsion boilers aboard MSC ships, operating at pressures less than 850 psi, use the Drew Standard system. Auxiliary and waste heat boilers on MSC ships use the Drew AKG-100 chemical treatment system. 2 

### Three different treatment systems are used due to the different operating temperatures of each type of boiler. The treatment chemicals are the same for all three systems but the proportions of the chemicals are different depending on the operating temperature of the boiler.

2.1.1.4 USCG Boiler Water Chemistry
There are no steam-powered ships in the USCG; however, many USCG ships have auxiliary boilers. The preferred method of water treatment in the USCG is a magnetic water treatment (MWT) system, which does not utilize any chemicals. The MWT system uses a device that generates a magnetic field in the water stream to help prevent scale formation. Although the preferred method of treatment is MWT, some USCG ships treat their boiler water with COPHOS, as defined by Navy guidance. 3,8



### 2.1.2 Nuclear Powered Ship Steam Generator Blowdown
All nuclear-powered ships have steam generators which require periodic blowdowns (typically about once per week) to maintain safe operation of the system. 4 

### Section 3 and 4

### Boiler Blowdown 5 contain discussions of constituents, concentrations, and mass loadings from nuclear powered ships steam generators, but further information on the process description is classified.

2.1.3 Safety Valve Testing
Testing is necessary to ensure the proper operation of all main and auxiliary boiler safety valves. Safety valves are installed on each boiler to prevent a boiler rupture in the event of excessive pressure buildup. They are installed on the upper portion of the boiler and only discharge steam. Unlike surface and bottom blowdowns, liquid and particulate matter are not discharged from safety valves. Main propulsion boilers usually have three or four safety valves, and auxiliary or waste heat boilers have two valves. Periodic testing results in a very short discharge of steam at full boiler pressure to the atmosphere through an escape pipe on the ship’s smokestack. This testing must be performed annually for each boiler. Safety valves must also be tested after each boiler hydrostatic test and whenever a boiler is placed back in service after a repair. 9 

### For MSC ships, safety valve tests are performed annually during each USCG inspection. These tests are typically performed in port.
Safety valves are tested to measure the exact pressure at which the safety valves fully lift and reset. These pressures are defined by the boiler specifications. If the valves do not lift or reseat at the specified pressure, the test must be repeated after making adjustments to the safety valves until the exact pressures are met. 8 

### Although steam is discharged at full boiler pressure, the release is to the atmosphere through an escape pipe on the back of the smokestack and only small amounts of condensate reach the water. The discharge is in the form of water vapor released to the atmosphere.
Safety valve testing is also performed on each nuclear powered ship steam generator. This discharge is identical to safety valve testing on conventionally-powered ship boilers; however, the discharge exits below the waterline instead of being released to the atmosphere through an escape pipe. Safety valve testing is performed once every five years on each nuclear steam generator.

2.2 Releases to the Environment
Boiler and steam generator blowdown discharges are infrequent, of short duration (seconds), in small volumes (approximately 310 gallons maximum), and at high pressures (up to 1200 psi). The discharge consists of water and steam or sludge-bearing water at elevated temperatures (above 325 ° F) and pressures. The discharge can contain metals or boiler water treatment chemicals. The frequency of the discharge is based on boiler and steam generator water chemistry and operation and is therefore not predictable. Boiler and steam generator blowdown discharges are released through hull fittings located below the ship’s waterline (underwater discharge).

### Boiler Blowdown 6 2.3 Vessels Producing the Discharge
Table 1 list the various Navy, MSC, and USCG vessels which generate boiler blowdown discharge. Ships that use steam for propulsion purposes produce the largest volume of discharge. These ships use high pressure steam (1200 and 600 psi steam systems) to drive propulsion and auxiliary equipment. Diesel and gas turbine powered ships can use fuel fired or waste heat boilers, which operate at pressures up to 150 psi, to generate steam for auxiliary systems. Vessels that use auxiliary and waste heat boilers are also identified in Table 1. All nuclear powered ships have steam generators. There are 89 submarines, 3 nuclear powered cruisers, and 8 nuclear powered aircraft carriers that blow down steam generator water. 4 

### Army, Marine Corps, and Air Force vessels do not utilize steam systems and do not generate this discharge.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Boiler blowdowns can occur when a boiler is ope rating, after it has been secured, or when under a steam blanket. Thus, these discharges occur within and beyond 12 nautical miles (n.m.) from shore. Safety valve testing on nuclear powered ship steam generators only occurs in port.

3.2 Rate
The volume of water in the boiler while steaming (steaming volume) is used to determine the amount of water/sludge discharged during surface, scum, and bottom blowdowns. These volumes are listed in Table 1 for each ship class and a sample calculation is provided below. 1 

### Surface blowdowns discharge five percent of the steaming water volume, scum blowdowns discharge one percent of the steaming water volume, and bottom blowdowns discharge ten percent of the steaming water volume. 1 

### The number of blowdowns per year within 12 n.m. were estimated based on a Naval Ship Systems Engineering Station report on boiler blowdown discharges and revised based on vessel operation within 12 n.m. 5,10 

### These estimates for each ship category are listed in Table 2. USCG ships with MWT do not use chemical boiler water treatments, but are included in the blowdown table to include their thermal effect and because their blowdown contains metal constituents. 3 

### USCG ships with COPHOS treated feedwater are also included in the table. The majority of USCG vessel operations are typically performed within 12 n.m. of shore; therefore, the total number of bottom and surface blowdowns is higher than for Navy vessels. 10,11

### Boiler Blowdown 7 Boiler Blowdown Volume, gal per year = (discharge)(number of blowdowns) Where: discharge (gal) = (Boiler steaming volume, gal)(percent volume discharged per blowdown) number of blowdowns = number of blowdowns with 12 n.m. per year

The total blowdown discharge volume within 12 n.m. of shore is 570,860 gallons for Navy main propulsion boilers and 190,348 gallons for Navy auxiliary and waste heat boilers. Total blowdown discharge volume within 12 n.m. is 205,800 gallons for MSC main propulsion boilers and 58,500 gallons for MSC auxiliary and waste heat boilers. The total blowdown discharge volume from USCG auxiliary boilers is 93,600 gallons. The total boiler blowdown discharge volume within 12 n.m. for all Navy, MSC, and USCG ships is 1,119,108 gallons.
Blowdowns for nuclear powered ships steam generators results in a total volume of 3,615,000 gallons per year. 12



### The volume discharged from safety valve testing on nuclear powered ships steam generators is not available. The safety valves are tested once every five years. The available information is in the form of mass loadings and is discussed in Section 4.1.

3.3 Constituents
Boiler blowdown for conventionally powered ships (e.g., steam, diesel, and gas turbine) was sampled under the UNDS sampling program. Samples were taken from five ship classes: the LHD 1 class, the CG 47 class, the LSD 49 class, the T-AO 187 class, and WHEC 378 class. LHD 1 class uses chelant water treatment; CG 47 and LSD 49 classes use COPHOS water treatment; T-AO 187 class uses the Drew Ameroid water treatment; and WHEC 378 uses magnetic water treatment. Boiler samples were analyzed for metals, organics, and classicals based on the boiler blowdown process, system designs, and analytical data available. In addition, hydrazine, a boiler treatment chemical, was specifically tested for since it was not in the aforementioned analyte classes and it was most likely to be present in boiler blowdown. The results of the sampling are provided in Table 3.
The surface blowdown sample for T-AO-187 class was contaminated at the sampling station, which is also used by the ship to sample diesel jacket water (a closed loop cooling system) through common sampling piping. 13 

### The bottom blowdown sample was taken from the same sampling system, but was completed after the surface blowdown sample was taken and after additional flushing of the piping system had occurred. The constituent concentrations for the bottom blowdown sample appear to be similar to other systems sampled. Even though the surface blowdown constituent concentrations are suspect, they have been used to calculate mass loadings since no other data is available at this time.
The sampling of nuclear powered ships steam generators was conducted separate from the sampling performed on conventionally-powered boilers. Constituent data for nuclear powered ships steam generators is listed in Table 4. 12

### Boiler Blowdown 8 Of the constituents detected in boiler and steam generator blowdown and safety valve testing discharges, antimony, arsenic, cadmium, copper, chromium, lead, nickel, selenium, thallium, zinc, and bis(2-ethylhexyl) phthalate are priority pollutants as defined by the EPA. There are no constituents in boiler or steam generator blowdown that have been identified as bioaccumulators.

3.4 Concentrations
A summary of the analytical results are presented in Table 3. 14 

### This table shows the constituents, the log-normal mean or concentration value for single sample data, the frequency of detection for each constituent, the minimum and maximum concentrations for multiple sample data, and the mass loadings of each constituent. For the purposes of calculating the log-normal mean, a value of one-half the detection limit was used for non-detected results. The concentrations of constituents in nuclear powered ships steam generator blowdowns are provided in Table 4. 15 

### No constituent concentration data are available for safety valve testing discharges.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria.Section 4.3 discusses thermal effects. In Section 4.4, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Based on the discharge volume estimates developed in Tables 1 and 2 and the log-normal mean discharge concentrations, mass loadings are presented in Table 3. Table 5 is present in order to highlight constituents with log-normal mean concentrations that exceed ambient water quality criteria. A sample calculation of the estimated annual mass loading for copper is shown here:

Mass Loading for Copper (Total)

Mass Loading = (Net Positive Log-normal Mean Concentration)(Flow Rate) (203 μ g/L)(3.785 L/gal)(590,343 gal/yr)(g/1,000,000 μ g)(lb/453.593 g) ≅ 1 lb/yr

The annual mass loadings are reported for the entire fleet. The total annual discharge of copper is only 7.2 pounds per year for conventionally powered ships which is discharged over a large geographical area. The largest metal mass loading discharged is iron at 37.5 pounds per year for conventionally powered boilers which is discharged over a large geographical area. These loadings include the constituent concentration data from the T-AO 203 surface blowdown sample even though this sample has been determined to be contaminated.
The annual mass loadings per ship class are repor ted for the ship classes that the samples

### Boiler Blowdown 9 were taken. The total loading of copper for the LHD 1 class (Chelant) is 0.063 pounds, for the CG 47 and LSD 49 classes (COPHOS) is 1.6 pounds, for the WHEC 378 class (MWT) is 0.008 pounds, and for the T-AO 187 class (Drew) is 0.194 pounds. A sample calculation of the estimated annual mass loading for copper on the LHD 1 is shown here:

Mass Loading on the LHD 1 for Copper (Total) = (Surface Blowdown Log-normal Mean Concentration)(Surface Blowdown Flow Rate) + (Bottom Blowdown Log-normal Mean Concentration)(Bottom Blowdown Flow Rate) = (203 μ g/L)(3.785 L/gal)(32,240 gal/yr)(g/1,000,000 μ g)(lb/453.593 g) + (40.6 μ g/L)(3.785 L/gal)(24,800 gal/yr)(g/1,000,000 μ g)(lb/453.593 g) ≅ 0.063 lb/yr

Nuclear powered ships steam generator blowdown mass loadings are listed in Table 6. The annual mass loading of copper from nuclear powered ships steam generators is approximately 3.2 pounds per year.
The total annual discharge of copper is o nly 11.62 pounds for the entire fleet or 0.03 pound per ship per year, which is discharged over a large geographical area. The largest metal discharge is iron at approximately 38.5 pounds annually for the entire fleet or 0.11 pound per ship per year.
Since safety valve testing releases only steam, and not liquid nor particulate matter as in surface and bottom blowdowns, the mass of constituents discharged is expected to be much smaller than that discharged from boiler blowdown. Table 7 lists the discharges from safety valve testing from nuclear powered ships steam generators. 15 

### The total mass loadings of all constituents for all nuclear powered ships for safety valve testing is approximately 4.38 pounds per year.

4.2 Environmental Concentrations
The constituent concentrations and their corresponding Federal and most stringent state water quality criteria (WQC) are listed in Tables 8 and 9. These tables include the constituent concentrations from the T-AO 203. Federal and most stringent state WQC for metals are based on the dissolved fraction of the metal. For conventionally powered boilers, copper concentrations for all feedwater treatment systems exceeded Federal and most stringent state WQC. Iron concentrations for all feedwater treatment systems exceeded Florida’s WQC. Lead concentrations for all feedwater treatment systems, except chelant, exceeded Florida’s and Georgia’s WQC but did not exceed the Federal WQC except for Drew Chemicals feedwater treatment. Nickel concentrations for the chelant, Drew Chemicals and COPHOS feedwater treatment systems exceeded Federal and most stringent state WQC. Nickel concentrations for the magnetic water treatment system exceeded the most stringent state (Florida and Georgia) WQC but did not exceed the Federal WQC. Zinc concentrations for the chelant, Drew Chemicals and COPHOS feedwater treatment systems exceeded Federal and most stringent state WQC. Nitrogen (as ammonia, nitrate/nitrite, and total kjeldahl nitrogen) concentrations for all feedwater treatment systems exceeded most stringent state WQC. Phosphorous concentrations for all feedwater treatment systems other than Drew

### Boiler Blowdown 10 Chemicals for Bottom Blowdown exceeded most stringent state WQC. Bis(2-Ethylhexyl) phthalate for Drew Chemicals feedwater treatment systems and COPHOS Bottom Blowdown feedwater treatment system exceeded most stringent state WQC.
For nuclear powered ships steam generators, copper concentrations exceed Federal and most stringent state WQC. Lead concentrations exceed Florida’s WQC. Nickel concentrations for the CVN 65 carrier exceed both Federal and most stringent state water quality criteria; all other ships are below the Federal WQC for nickel, but are above the most stringent state WQC. Nitrogen (as ammonia, nitrate/nitrite, and total kjeldahl nitrogen) and phosphorous exceed the most stringent state WQC.
Although the concentrations of copper from boiler blowdowns are greater than water quality criteria at the point of discharge, the turbulent mixing, pressure of the blowdown discharge, and small volumes of the blowdown will cause concentrations to decrease rapidly. The estimated discharge velocity at boiler pressure (1200 psi) is 422 ft/sec. This translates to discharge rates of 68 gal/sec for a 2.0 inch diameter discharge fitting and 38.74 gal/sec for a 1.5 inch discharge fitting. As a comparison, at 100 psi (auxiliary boiler pressure) the discharge velocity is 121 ft/sec, which translates to a discharge rate of 11.22 gal/sec from a 1.5 inch diameter discharge fitting. The LHA1 class ships have the boilers that produce the largest volume blowdown of 310 gallons. A bottom blowdown from a boiler on an LHA 1 class ship will only discharge 0.09 grams of copper. Therefore, it is expected concentrations of copper, lead, and nickel will fall below WQC briefly after discharge.

4.3 Thermal Effects
The potential for boiler blowdown to cause thermal environmental effects was evaluated by modeling the thermal plume for boiler blowdown generated under conservative conditions and then comparing the calculated thermal plume to the state thermal plume size requirements. The thermal effects were modeled by using a batch discharge approach which uses thermodynamic equations and geometry to estimate the plume size. The steps to estimate the maximum size of the thermal plume for a given acceptable mixed temperature are given below: 16



### • calculate the total heat and mass injected in a blowdown;

• calculate the volume of water needed to dilute this mass of water such that the acceptable mixed temperature is obtained; and

• use geometry to find the region centered on the release point (and assuming a totally vertically mixed column) that will provide the volume required to reduce the temperature to the desired temperature criteria.
The discharge is directed downward at a high flow rate and at high velocities. Therefore, the plume is assumed to expand outward and equally in all directions, thus forming a vertically cylindrical shape. The velocity of the discharge at the discharge fitting would be 422 ft/sec, which would put the discharge rate at 68 gal/sec from a 2.0 inch diameter discharge fitting and 38.74 gal/sec from a 1.5 inch diameter discharge fitting. As a comparison, at 100 psig (auxiliary boiler pressure), the velocity of the discharge would be 121 ft/sec, which would put the discharge

### Boiler Blowdown 11 rate at 11.22 gal/sec from a 1.5 inch diameter discharge fitting.
The bottom blowdown discharges from an LHA 1 Class vessel and an AFS 1 Class vessel were modeled. The LHA 1 uses the chelant treatment system and has main propulsion boilers (the largest size) and the AFS 1 uses Drew chemistry with average size boilers. They represent a large boiler blowdown volume and an average boiler blowdown volume. The LHA was modeled with a batch discharge of 310 gallons at roughly 504 °F (262 °C) through a 2-inch diameter pipe at the bottom of the ship. The AFS 1 was modeled with a batch discharge of 150 gallons at 495 °F (257 °C) through a 1.5-inch diameter pipe at the bottom of the ship. A sample calculation is provided at the end of this report. The plume characteristics were compared to thermal mixing zone criteria for Virginia and Washington State, which are the only two states with established thermal plume mixing zone criteria. The Washington State thermal regulations require that when natural conditions exceed 16 °C, no temperature increases will be allowed that will raise the receiving water temperature by greater than 0.3 °C. The mixing zone requirements state that mixing zones shall not extend for a distance greater than 200 feet plus the depth of the water over the discharge point, or shall not occupy greater than 25% of the width of the water body. The Virginia thermal regulations state that any rise above natural temperature shall not exceed 3 °C. Virginia’s mixing zone requirements state that the plume shall not constitute more than one-half of the receiving watercourse. They shall not extend downstream at any time a distance more than five times the width of the receiving watercourse at the point of discharge.
The assumptions for all the thermal modeling conducted under the UNDS program are listed below and the results of the thermal modeling for this discharge are summarized in Table 11. 16



## • The discharge will occur during a simulated slack tide event, using a minimum water

body velocity (0.03 m/s);



## • The discharge would occur during the winter months (largest difference in temperature between the discharge and receiving water temperatures), which results in the largest thermal plume; and



## • The average depth of water at the pier is 40 feet.
Using these assumptions, boiler blowdown discharges from all Navy ships meet Virginia and Washington State thermal mixing zone criteria, Table 10. 16



### Safety valve testing from nuclear powered ships steam generators is discharged in small, intermittent bursts of steam that condenses when reaching the water. The volume of water discharged is too small to be effectively modeled and the thermal effects are negligible due to the immediate mixing with surrounding waters.

4.4 Potential for Introducing Non-Indigenous Species
The potential for introducing non-indigenous species is not significant, since the source of the water is treated freshwater that is heated to high temperatures (over 325 ° F) and high pressures (up to 1200 psi).

### Boiler Blowdown 12 5.0 CONCLUSIONS

5.1 Boiler and Nuclear Powered Ship Steam Generators Blowdowns
Boiler and nuclear powered ships steam generator blowdowns have a low potential to cause an adverse environmental effect because:

• Mass loadings of copper, lead, nickel, bis(2-ethylhexyl) phthalate, ammonia, nitrogen, and phosphorous are small.

• This discharge rapidly dissipates because it occurs at high flow rates (up to 68 gal/sec) and it is a small volume (310 gallons or less). Modeling the discharge plume shows the constituent concentrations and temperature will be below water criteria within a short distance from the ship for all ship classes that discharge boiler blowdown.

• Boiler blowdown is discharged intermittently throughout the U.S. at Armed Forces ports, and each individual port receives only a fraction of the total fleetwide mass loading.

5.2 Safety Valve Testing
Safety valve testing discharge from nuclear powered ships steam generators is released to the water. However, the total mass discharged is small, only 4.38 pounds of all constituents per year for all nuclear powered ships combined. The small volumes of the discharge cause the thermal loading to dissipate in the receiving waters almost immediately after entry. Therefore, safety valve testing has a low potential to cause an adverse environmental effect.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Sampling data from four surface ships provided concentrations, and mass loadings were calculated from the rate and the concentrations. Table 13 shows the source of data used to develop this NOD report.
Specific References

1. Naval Ships’ Technical Manual (NSTM), Chapter 220, Volume 2, Revision 7, Boiler Water/Feed Water Test & Treatment. Pages 21-18 to 21-26, 22-1 to 22-51, 29-1 to 29- 41, 30-9 to 30-25, and 31-1 to 31-36. December 1995.

### Boiler Blowdown 13 2. Drew Ameroid Marine Division, Ashland Chemical Company. Fax Transmission to George Stewart on Boiler Control Limits. January 1997.

3. Coast Guard Specification, Chapter 220 Boilers and Force Circulation Steam Generators. COMDTINST M9000.6B.

4. UNDS Equipment Expert Structured Questions - Nuclear Steam Generator Blowdown. August 16, 1996. Amy J. Potts NAVSEA 08U.

5. Boiler B lowdown Discharges, Naval Ship Systems Engineering Station Serial No. 9220, Ser 044C/4060. August 23, 1991.

6. UNDS Equipment Expert Meeting Minutes. Boiler Blowdown. August 16, 1996.

7. Chelant Boiler Feedwater Treatment Implementation - Report of Travel. Naval Surface Warfare Center, Carderock Division, Serial No. 9220, Ser 622/296. March 10, 1995.

8. Personal Communication Between LT Joyce Aivalotis, USCG, and Leslie Panek, Versar, Inc., Information on Boiler Water Treatment. April 9, 1997.

9. Naval Ship's Technical Manual (NSTM), Chapter 221, Vol. 1. Boilers. Pages 1 to 6, 12 to 30, 106 to 124, 173, 184 to 187, and 205 to 209. September 15, 1993.

10. Personal Communication Between Leslie Panek, Versar, Inc., and George Stewart, M. Rosenblatt & Son, Inc., Boiler Blowdown Frequency Within 12 n.m. February 3, 1997.

11. Personal Communication Between LT Joyce Aivalotis, USCG, and Craig Berry, M. Rosenblatt & Son, Inc., Information on Coast Guard Blowdown Practices. September 12, 1997.

12. N AVSEA Memo Ser. 08U/C97-13818 dated 17 September 1997, Nuclear-Powered Ship Steam Generator Blowdown Effluent Data for UNDS Discharge Characterization.

13. Personal Communication Between Craig Berry, M. Rosenblatt & Son, Inc., and Paul Devoe, MSC, on 21 October, 1997.

14. UNDS Phase I Sampling Data Report, Volumes 1-13, October 1997.

15. UNDS Equipment Expert Meeting Action Item Response from Charles Taylor, NAVSEA 08. Provide Information on Safety Valve Testing on Nuclear Ships. May 12, 1997.

16. NAV SEA. Thermal Effects Screening of Discharges from Vessels of the Armed Services. Versar, Inc. July 3, 1997.

General References

### Boiler Blowdown 14 USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Blank, David A.; Arthur E. Bock; and David J. Richardson. Introduction to Naval Engineering, Second Edition. Naval Institute Press, 1985.

### Boiler Blowdown 15 Ganic, Ejup N. and Tyler G. Hicks. Essential Engineering Information and Data. McGraw-Hill, Inc., 1991.
Memorandum for the Director of Environmental Protection/Occupational Safety and Health, SEA-00T. “Implementation of Vessel Uniform National Discharge Standards for Liquid

Baumeister, Theodore; Eugene A. Avallone; and Theodore Baumeister, III. Marks’ Standard Handbook for Mechanical Engineers. McGraw-Hill Book Company, 1978.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.
UNDS Ship Database, August 1, 1997.

### Boiler Blowdown 16 Calculation Sheet # 1 Thermal Batch Discharge Screening Calculations

A. Assumptions and Given Conditions:

1. Saturated liquid heat loss(specific heat, c p 

### ) from 262 °C down to 100 °C emits 0.9 cal/g- ° C 2. Water heat loss (specific heat, c p 

### ) from 100 down to regulation temperature (7.44°C Virginia regulation) emits 1 cal/g- ° C 3. Heat transfer will occur under conditions of constant pressure 4. Maximum rise in water temperature will be assumed to equal the Virginia regulation of 3 ° C 5. Ambient temperature is assumed to be 4.44 °C 6. Assume plume will disperse in the shape of a vertical cylinder 4 m in depth 7. Calculations will be based on an LHA 1 blowdow n event, therefore:

• Blowdown discharge temperature is assumed to be 262 ° C

• Blowdown discharge volume is assumed to be 310 gallons
The heat required to change temperature without a phase change is given by the following equation:

Q = (m)(c p 

### )( Δ T)

where: Q = heat (calories) m = mass of water (grams)

c p 

### = constant pressure specific heat (cal/g- ° C) Δ T = change in temperature ( ° C)

B. Determine Mass of Water in Discharge:
Initial volume of water in steam form is 310 gallons of water (LHA 1 Blowdown):
Conversion from gallons of water to mass of water:

(8.343 lbs/gallons)(454 grams/lbs)(310 gallons) = 1.17 x 10 6 

### grams

C) High Temperature Water Heat Loss

Q = (m)(c p 

### )( Δ T)

Q = (1.17 x 10 6 

### grams)(0.9 cal/gram/°C)(262 - 100 °C)

Q = 170,586,000 calories

### Boiler Blowdown 17 D) Water Heat Loss

Q = (m)(c p 

### )( Δ T)

Q = (1.17 x 10 6 

### grams)(1 cal/g-°C)(100 - 7.44 °C(Virginia regulation))

Q = 108,295,200 calories

E). Determine Volume of Surrounding Water to Absorb Heat
Calculate the volume of surrounding water required to absorb heat in order to obtain completely mixed water at the regulatory limit (gallons). Assume that the heat lost by the steam and water in the discharge is the same as the heat gained by the surrounding water.

i) Mass of Water Required Let X= the mass of water required to obtain the mixture, then

Σ Q = (m)(c p 

### )( Δ T) (108,295,200) + (170,586,000) = (X grams of water)(1 cal/g-°C)(3 °C)

92,960,400 grams = X
Converting to gallons: (92,960,400 grams)(1 lb/454 grams) (1 gall/8.343lbs) = 24,542 gallons

ii) Total Volume of Water Required to Meet Virginia Regulations = 24,542 gallons + 310 gallons

= 24,850 gallons

F). Determine Dimensions of Cylinder
The cylinder of water (estimated plume shape) over the water depth to bottom of 4 m (estimated value based on process knowledge):
Volume = 24,850 gallons x 0.0037854 m 3 

### /gallon = 94 m 3



### Volume = ( π )(d 2 

### /4)(h) where d = cylinder diameter and h = cylinder height

Rearranging:

d 2 

### = (vol)(4)/( π )(h) h=4 m (water depth to bottom)

vol=94 m 3



### d = 5.5 m (diameter of plume cylinder)

### Boiler Blowdown 18 Table 1. Annual Surface, Scum, and Bottom Blowdown Volumes for each Ship Class of the Navy, MSC, and USCG

Armed Force Owner Ship Classes with

Main Propulsion Boilers Number of

Ships per Class Number of

Boilers per Ship Boiler Volume

During Steaming (gallons per boiler) Surface Blowdown

Volume per year (5% of boiler steaming volume in gallons) Scum Blowdown Volume per

year (1% of boiler steaming volume in gallons) Bottom Blowdown Volume per year (10% of boiler steaming volume in gallons) Total Blowdown Volume per year within 12 n.m. (gallons) Navy CV 63 3 8 2,200 58,080 10,560 52,800 121,440

CV 59 1 8 2,000 17,600 3,200 16,000 36,800 LPH 2 2 2 1,600 7,040 1,280 6,400 14,720 LPD 7 3 2 1,300 8,580 1,560 7,800 17,940 LPD 4 3 2 1,200 7,920 1,440 7,200 16,560 LPD 14 2 2 1,200 5,280 960 4,800 11,040 LSD 36 5 2 1,600 17,600 3,200 16,000 36,800 AGF 3 1 2 1,200 2,640 480 2,400 5,520 AGF 11 1 2 1,300 2,860 520 2,600 5,980 AO 177 5 2 2,900 31,900 5,800 29,000 66,700 AOE 1 4 4 1,900 33,440 6,080 30,400 69,920 AS 33 1 2 1,500 3,300 600 3,000 6,900 AS 39 3 2 1,400 9,240 1,680 8,400 19,320 LCC 19 2 2 1,400 6,160 1,120 5,600 12,880 LHD 1 4 2 3,100 27,280 4,960 24,800 57,040 LHA 1 5 2 3,100 34,100 6,200 31,000 71,300 T otal Boiler Blowdown for Navy Main Propulsion Boilers =570,860 MSC T-AE 26 8 3 1,500 39,600 NA 36,000 75,600

T-AFS 1 8 3 1,500 39,600 NA 36,000 75,600 T-AGM 22 1 2 1,000 2,200 NA 2,000 4,200 T-AG 194 2 2 1,000 4,400 NA 4,000 8,400 T-AH 19 2 2 1,000 4,400 NA 4,000 8,400 T-AKR 287 8 2 1,000 17,600 NA 16,000 33,600 Total Boiler Blowdown for MSC Main Propulsion Boilers =205,800

Note: Information obtained from NAVSSES Memo of 23 August, 1991, 5 and M. Rosenblatt & Son, Inc.

### Boiler Blowdown 19 Table 1. Annual Surface, Scum, and Bottom Blowdown Volumes for each Ship Class of the Navy, MSC, and USCG

Armed Force Owner Ship Classes with

Auxiliary or Waste Heat Boilers Number of

Ships per Class Number of

Boilers per Ship Boiler Volume

During Steaming (gallons per boiler) Surface Blowdown

Volume per year (5% of boiler steaming volume in gallons) Scum Blowdown Volume per

year (1% of boiler steaming volume in gallons) Bottom Blowdown Volume per year (10% of boiler steaming volume in gallons) Total Blowdown Volume per year within 12 n.m. (gallons) NAVY DDG 993 4 3 200 6,000 240 4,800 11,040

CG 47 27 3 100 20,250 810 16,200 37,260 DD 963 31 3 200 46,500 1,860 37,200 85,560 AOE 6 3 2 310 4,650 186 3,720 8,556 LSD 41 8 2 310 12,400 496 9,920 22,816 LSD 49 3 2 310 4,650 186 3,720 8,556 ARS 50 4 3 300 9,000 360 7,200 16,560 Total Boiler Blowdown for Navy auxiliary and waste heat boilers =190,348 MSC T-AFS 1 8 2 300 6,000 NA 9,600 15,600

T-ARC 7 1 2 300 750 NA 1,200 1,950 T-AGS 26 2 2 300 1,500 NA 2,400 3,900 T-AGS 45 1 2 300 750 NA 1,200 1,950 T-AGS 51 2 2 300 1,500 NA 2,400 3,900 T-AGS 60 4 2 300 3,000 NA 4,800 7,800 T-AO 187 12 2 300 9,000 NA 14,400 23,400 Total Boiler Blowdown for MSC Auxiliary and Waste Heat Boilers =58,500 USCG WLIC 160 4 2 100 2,400 NA 2,400 4,800

WLR 115 1 2 100 600 NA 600 1,200 WIX 295 1 2 100 600 NA 600 1,200 WAGB 399* 2 2 100 1,200 NA 1,200 2,400 WAGB 290* 1 2 100 600 NA 600 1,200 WHEC 378* 12 2 100 7,200 NA 7,200 14,400 WMEC 210A 5 2 100 3,000 NA 3,000 6,000 WMEC 210B 11 2 100 6,600 NA 6,600 13,200 WLB 180A* 8 2 100 4,800 NA 4,800 9,600 WLB 180B* 2 2 100 1,200 NA 1,200 2,400 WLB 180C* 13 2 100 7,800 NA 7,800 15,600 WLM 157* 9 2 100 5,400 NA 5,400 10,800 WTGB 140* 9 2 100 5,400 NA 5,400 10,800 Total Boiler Blowdown for Coast Guard Auxiliary Boilers =93,600

Total Boiler Blowdown for all Ships =1,119,108 Notes: Information obtained from NAVSSES Memo of 23 August, 1991, 5 and M. Rosenblatt & Son, Inc. *=These boilers use magnetic water treatment and do not discharge any chemicals. Their volumes are included because they contribute a thermal load. NA=USCG Auxiliary boilers do not have surface or scum blow connections and the MSC does not perform scum blowdowns.

### Boiler Blowdown 20 Table 2. Estimated Blowdown Frequencies for Calculation of Total Boiler Blowdown Volume within 12 n.m.

Armed Force Owner and Boiler Type Number of Surface

Blowdowns per year per boiler within 12 n.m. Number of Scum Blowdowns per year per boiler within 12 n.m. Number of Bottom Blowdowns per year per boiler within 12 n.m. Navy Main Propulsion 22 20 10 Auxiliary and Waste Heat 25 10 20

MSC Main Propulsion 22 20 10 Auxiliary and Waste Heat 25 10 20

USCG* Auxiliary 60 none 30

Notes: Information taken from a NAVSSES Memo of 23 August 1991,5 detailing boiler blowdowns per year and revised based ship operation, time in port, and operation within 12 n.m. * = The USCG auxiliary boilers conduct surface blowdowns once per day. Most of their activity is performed within 12 n.m. and therefore the number of bottom blowdowns are elevated to control boiler water chemistry.

### Boiler Blowdown 21 Table 3. Summary of Detected Analytes

Constituent Concentration Frequency of Mass Loading Chelant Surface Blowdown Detection CLASSICALS (mg/L) (lbs/yr) Alkalinity 38 1 of 1 102 Ammonia As Nitrogen 0.44 1 of 1 1 Biochemical Oxygen Demand 8 1 of 1 21 Chloride 24 1 of 1 64 Nitrate/Nitrite 0.23 1 of 1 1 Sulfate 12 1 of 1 32 Total Dissolved Solids 290 1 of 1 779 Total Kjeldahl Nitrogen 2.5 1 of 1 7 Total Organic Carbon (Toc) 13 1 of 1 35 Total Phosphorous 0.97 1 of 1 3 Total Sulfide (Iodometric) 7 1 of 1 19 Volatile Residue 184 1 of 1 494 HYDRAZINE (mg/L) (lbs/yr) Hydrazine 0.009 1 of 1 0.03 METALS ( μ g/L ) (lbs/yr) Aluminum Dissolved 630 1 of 1 2 Total 494 1 of 1 1 Antimony Dissolved 8.3 1 of 1 0.022 Total 9.7 1 of 1 0.026 Arsenic Dissolved 1 1 of 1 0.003 Total 2.5 1 of 1 0.007 Barium Dissolved 1.7 1 of 1 0.005 Total 2.2 1 of 1 0.006 Boron Total 29.6 1 of 1 0.080 Calcium Dissolved 51.6 1 of 1 0.1 Total 114 1 of 1 0.3 Cobalt Total 10.7 1 of 1 0.03 Copper Dissolved 207 1 of 1 1 Total 203 1 of 1 1

### Boiler Blowdown 22 Constituent Concentration Frequency of Mass Loading Chelant Surface Blowdown Detection METALS (Cont'd) ( μ g/L ) (lbs/yr) Iron Dissolved 626 1 of 1 2 Total 884 1 of 1 2 Magnesium Dissolved 179 1 of 1 0.5 Total 195 1 of 1 1 Manganese Dissolved 93.5 1 of 1 0.3 Total 95.5 1 of 1 0.3 Molybdenum Dissolved 17.6 1 of 1 0.05 Total 18.1 1 of 1 0.05 Nickel Dissolved 1,860 1 of 1 5 Total 1,810 1 of 1 5 Sodium Dissolved 40,100 1 of 1 108 Total 39,300 1 of 1 106 Zinc Dissolved 594 1 of 1 2 Total 601 1 of 1 2 ORGANICS ( μ g/ L) (lbs/yr) Benzoic Acid 1,230 1 of 1 3

### Boiler Blowdown 23 Table 3. Summary of Detected Analytes (Cont’d)

Constituents of Concentration Frequency of Mass Loading Chelant Bottom Blowdown Detection CLASSICALS (mg/L) (lbs/yr) Alkalinity 30 1 of 1 62 Ammonia As Nitrogen 0.11 1 of 1 0.2 Biochemical Oxygen Demand 9 1 of 1 19 Chloride 13 1 of 1 27 Nitrate/Nitrite 0.39 1 of 1 1 Sulfate 7,830 1 of 1 16,183 Total Dissolved Solids 102 1 of 1 211 Total Kjeldahl Nitrogen 0.47 1 of 1 1 Total Organic Carbon (T OC ) 12 1 of 1 25 Total Phosphorous 8.4 1 of 1 17 Total Recoverable Oil And Grease 2.45 1 of 1 5 Total Sulfide (Iodometric) 4 1 of 1 8 Volatile Residue 50 1 of 1 103 METALS ( μ g/L ) (lbs/yr) Aluminum Dissolved 430 1 of 1 1 Total 477 1 of 1 1 Antimony Dissolved 4.5 1 of 1 0.009 Total 5.55 1 of 1 0.011 Arsenic Total 1.3 1 of 1 0.003 Barium Dissolved 0.75 1 of 1 0.002 Total 0.85 1 of 1 0.002 Calcium Total 94.5 1 of 1 0.2 Copper Dissolved 75.9 1 of 1 0.2 Total 40.6 1 of 1 0 Iron Dissolved 222 1 of 1 0.5 Total 344 1 of 1 1 Manganese Dissolved 59.9 1 of 1 0.1 Total 61.3 1 of 1 0.1 Molybdenum Dissolved 16 1 of 1 0.03 Total 18.2 1 of 1 0.04

### Boiler Blowdown 24 Constituents of Concentration Frequency of Mass Loading Chelant Bottom Blowdown Detection METALS (Cont'd) ( μ g/L ) (lbs/yr) Nickel Dissolved 1,740 1 of 1 4 Total 1,835 1 of 1 4 Selenium Total 6 1 of 1 0.01 Sodium Dissolved 37,700 1 of 1 78 Total 38,750 1 of 1 80 Thallium Dissolved 1 1 of 1 0.002 Zinc Dissolved 377 1 of 1 1 Total 382 1 of 1 1

ORGANICS ( μ g/L ) (lbs/yr) Benzoic Acid 1,385 1 of 1 3

### Boiler Blowdown 25 Table 3. Summary of Detected Analytes (Cont’d)

Constituents of Concentration Frequency of Mass Loading Magnetic Surface Blowdown Detection CLASSICALS (mg/L) (lbs/yr) Alkalinity 30 1 of 1 8 Ammonia As Nitrogen 0.22 1 of 1 0.1 Biochemical Oxygen Demand 5 1 of 1 1 Chemical Oxygen Demand (C OD ) 13 1 of 1 4 Chloride 17 1 of 1 5 Nitrate/Nitrite 0.78 1 of 1 0.2 Sulfate 36 1 of 1 10 Total Dissolved Solids 132 1 of 1 37 Total Kjeldahl Nitrogen 1 1 of 1 0.3 Total Organic Carbon (T OC ) 6 1 of 1 2 Total Phosphorous 0.05 1 of 1 0.01 Total Recoverable Oil And Grease 1.1 1 of 1 0.3 Total Sulfide (Iodometric) 16 1 of 1 4 Total Suspended Solids 7 1 of 1 2 Volatile Residue 49 1 of 1 14 HYDRAZINE (mg/L) (lbs/yr) Hydrazine 0.007 1 of 1 0.003 METALS ( μ g/ L) (lbs/yr) Arsenic Total 1.3 1 of 1 0.0004 Barium Dissolved 41.9 1 of 1 0.01 Total 42.8 1 of 1 0.01 Boron Dissolved 38.3 1 of 1 0.01 Total 39.9 1 of 1 0.01 Calcium Dissolved 28,900 1 of 1 8 Total 31,300 1 of 1 9 Copper Dissolved 15.8 1 of 1 0.004 Total 64.9 1 of 1 0.02 Iron Total 4,170 1 of 1 1 Lead Dissolved 22.8 1 of 1 0.006 Total 193 1 of 1 0.054

### Boiler Blowdown 26 Constituents of Concentration Frequency of Mass Loading Magnetic Surface Blowdown Detection METALS (Cont'd) ( μ g/ L) (lbs/yr) Magnesium Dissolved 1,270 1 of 1 0.4 Total 2,220 1 of 1 1 Manganese Total 83 1 of 1 0.02 Nickel Total 27.6 1 of 1 0.01 Selenium Total 32.4 1 of 1 0.01 Sodium Dissolved 8,080 1 of 1 2 Total 5,380 1 of 1 2 Zinc Total 53.1 1 of 1 0.01

### Boiler Blowdown 27 Table 3. Summary of Detected Analytes (Cont’d)

Constituents of Concentration Frequency of Mass Loading Magnetic Bottom Blowdown Detection CLASSICALS (mg/L) (lbs/yr) Alkalinity 34 1 of 1 10 Ammonia As Nitrogen 1.4 1 of 1 0.4 Chloride 13 1 of 1 4 Nitrate/Nitrite 0.93 1 of 1 0.3 Sulfate 108 1 of 1 30 Total Dissolved Solids 207 1 of 1 58 Total Organic Carbon (T OC ) 3.2 1 of 1 1 Total Phosphorous 0.14 1 of 1 0.04 Total Sulfide (Iodometric) 11 1 of 1 3 Total Suspended Solids 40 1 of 1 11 Volatile Residue 174 1 of 1 49 METALS ( μ g/ L) (lbs/yr) Aluminum Total 100 1 of 1 0.03 Arsenic Dissolved 1.15 1 of 1 0.0003 Barium Dissolved 18.4 1 of 1 0.005 Total 20.2 1 of 1 0.006 Boron Total 26.7 1 of 1 0.007 Calcium Dissolved 25,750 1 of 1 7 Total 27,400 1 of 1 8 Copper Total 63.1 1 of 1 0.02 Iron Dissolved 116 1 of 1 0.03 Total 1855 1 of 1 1 Lead Dissolved 2.2 1 of 1 0.001 Total 41.7 1 of 1 0.012 Magnesium Dissolved 2,455 1 of 1 1 Total 3,000 1 of 1 1 Manganese Dissolved 15.3 1 of 1 0.004 Total 40.6 1 of 1 0.01 Nickel Total 14.7 1 of 1 0.004 Sodium Dissolved 6,385 1 of 1 2 Total 5,140 1 of 1 1 Zinc Total 49.9 1 of 1 0.01

### Boiler Blowdown 28 Table 3. Summary of Detected Analytes (Cont’d)

Constituents of Concentration Frequency of Mass Loading Drew Surface Blowdown Detection CLASSICALS (mg/L) (lbs/yr) Alkalinity 945 1 of 1 1,030 Ammonia As Nitrogen 1.8 1 of 1 2 Chemical Oxygen Demand (C OD ) 2,030 1 of 1 2,213 Chloride 148 1 of 1 161 Nitrate/Nitrite 115 1 of 1 125 Sulfate 66 1 of 1 72 Total Dissolved Solids 2,540 1 of 1 2,769 Total Kjeldahl Nitrogen 10 1 of 1 11 Total Organic Carbon (T OC ) 100 1 of 1 109 Total Phosphorous 0.26 1 of 1 0.3 Total Recoverable Oil And Grease 3.5 1 of 1 4 Total Sulfide (Iodometric) 10 1 of 1 11 Total Suspended Solids 45 1 of 1 49 HYDRAZINE (mg/L) (lbs/yr) Hydrazine 0.1 1 of 1 0.11 METALS ( μ g/ L) (lbs/yr) Aluminum Total 1,140 1 of 1 1 Arsenic Dissolved 24.7 1 of 1 0.03 Total 23.5 1 of 1 0.03 Barium Dissolved 13.6 1 of 1 0.01 Total 60 1 of 1 0.07 Boron Dissolved 177,000 1 of 1 193 Total 175,000 1 of 1 191 Cadmium Total 5 1 of 1 0.01 Calcium Dissolved 25,400 1 of 1 28 Total 29,900 1 of 1 33 Copper Dissolved 14.8 1 of 1 0 Total 2,340 1 of 1 3 Iron Dissolved 70.9 1 of 1 0.1 Total 24,800 1 of 1 27

### Boiler Blowdown 29 Constituents of Concentration Frequency of Mass Loading Drew Surface Blowdown Detection METALS (Cont'd) ( μ g/ L) (lbs/yr) Lead Dissolved 2.9 1 of 1 0.003 Total 463 1 of 1 1 Magnesium Dissolved 178 1 of 1 0.2 Total 9,140 1 of 1 10 Manganese Total 261 1 of 1 0.3 Molybdenum Dissolved 10.6 1 of 1 0.01 Total 10.7 1 of 1 0.01 Nickel Total 125 1 of 1 0.1 Sodium Dissolved 697,000 1 of 1 760 Total 660,000 1 of 1 720 Tin Total 62.4 1 of 1 0.1 Titanium Total 28.3 1 of 1 0.03 Zinc Dissolved 47.3 1 of 1 0.1 Total 7,850 1 of 1 9 ORGANICS ( μ g/ L) (lbs/yr) 2-(Methylthio) Benzothiazole 213 1 of 1 0.2 Bis(2-Ethylhexyl) Phthalate 16 1 of 1 0.02

### Boiler Blowdown 30 Table 3. Summary of Detected Analytes (Cont’d)

Constituents of Concentration Frequency of Mass Loading Drew Bottom Blowdown Detection CLASSICALS (mg/L) (lbs/yr) Alkalinity 45 1 of 1 50 Ammonia As Nitrogen 1.5 1 of 1 2 Biochemical Oxygen Demand 8 1 of 1 9 Chloride 49 1 of 1 55 Nitrate/Nitrite 0.32 1 of 1 0.4 Sulfate 4.8 1 of 1 5 Total Dissolved Solids 112 1 of 1 125 Total Kjeldahl Nitrogen 11 1 of 1 12 Total Organic Carbon (T OC ) 24 1 of 1 27 Total Recoverable Oil And Grease 2.85 1 of 1 3 Total Sulfide (Iodometric) 10 1 of 1 11 Volatile Residue 81 1 of 1 90 HYDRAZINE (mg/L) (lbs/yr) Hydrazine 0.007 1 of 1 0.01 METALS ( μ g/ L) (lbs/yr) Aluminum Dissolved 63.4 1 of 1 0.07 Arsenic Dissolved 8.3 1 of 1 0.01 Barium Dissolved 15.3 1 of 1 0.02 Total 19.8 1 of 1 0.02 Calcium Dissolved 74.3 1 of 1 0.1 Total 83.6 1 of 1 0.1 Copper Dissolved 127 1 of 1 0.1 Total 153 1 of 1 0.2 Iron Dissolved 44.8 1 of 1 0.05 Total 1,001 1 of 1 1 Lead Total 7.35 1 of 1 0.01 Magnesium Dissolved 80 1 of 1 0.09 Total 82 1 of 1 0.09

### Boiler Blowdown 31 Constituents of Concentration Frequency of Mass Loading Drew Bottom Blowdown Detection METALS (Cont’d) ( μ g/ L) (lbs/yr) Manganese Dissolved 2.95 1 of 1 0.00 Total 21 1 of 1 0.02 Nickel Total 12.6 1 of 1 0.01 Selenium Total 12.7 1 of 1 0.01 Sodium Dissolved 1,590 1 of 1 2 Total 1,425 1 of 1 2 Zinc Dissolved 97.8 1 of 1 0.1 Total 277 1 of 1 0.3 ORGANICS ( μ g/ L) (lbs/yr) Bis(2-Ethylhexyl) Phthalate 13 1 of 1 0.01

### Boiler Blowdown 32 Table 3. Summary of Detected Analytes (Cont’d)

Constituents of Log Normal Frequency of Minimum Maximum Mass Loading COPHOS Surface Blowdown Mean Detection Concentration Concentration CLASSICALS (mg/L) (mg/L) (mg/L) (lbs/yr) Alkalinity 97.3 2 of 2 91 104 75 Ammonia As Nitrogen 0.21 2 of 2 0.11 0.39 0.2 Chloride 1.22 1 of 2 BDL 3 1 Hexane Extractable Material 3.87 1 of 2 BDL 6 3 Nitrate/Nitrite 0.45 2 of 2 0.24 0.85 0.3 Sulfate 3.16 1 of 2 BDL 4 2 Total Dissolved Solids 81.0 2 of 2 17 386 62 Total Kjeldahl Nitrogen 0.45 2 of 2 0.28 0.71 0.3 Total Organic Carbon (T OC ) 0.87 1 of 2 BDL 1.5 1 Total Phosphorous 11.5 2 of 2 2.6 51 9 Total Recoverable Oil And Grease 8.14 2 of 2 3.4 19.5 6 Total Sulfide (Iodometric) 4.30 1 of 2 BDL 37 3 Total Suspended Solids 11.5 2 of 2 6 22 9 Volatile Residue 67.7 2 of 2 23 199 52 HYDRAZINE (mg/L) (mg/L) (mg/L) (lbs/yr) Hydrazine 0.01 1 of 2 BDL 0.0019 0.01 METALS ( μ g/ L) ( μ g/ L) ( μ g/

L) (lbs/yr) Aluminum Dissolved 53.7 1 of 2 BDL 103 0.04 Barium Total 2.01 1 of 2 BDL 8.1 0.002 Calcium Total 36.9 1 of 2 BDL 64.9 0.03 Copper Dissolved 103 2 of 2 56.7 187 0.08 Total 3,390 2 of 2 1,310 8,780 3 Iron Dissolved 440 2 of 2 334 579 0.3 Total 4,327 2 of 2 2,480 7,550 3 Lead Dissolved 2.49 1 of 2 BDL 6.2 0.002 Total 22.4 2 of 2 8.2 61.4 0.017 Magnesium Total 91.2 1 of 2 BDL 260 0.070 Manganese Dissolved 3.00 2 of 2 1.7 5.3 0.002 Total 85.7 2 of 2 57.8 127 0.066

### Boiler Blowdown 33 Constituents of Log Normal Frequency of Minimum Maximum Mass Loading

COPHOS Surface Blowdown Mean Detection Concentration Concentration METALS (Cont'd) ( μ g/ L) ( μ g/ L) ( μ g/

L) (lbs/yr) Molybdenum Dissolved 3.46 1 of 2 BDL 8 0.003 Total 2.68 1 of 2 BDL 4.8 0.002 Nickel Dissolved 12.3 1 of 2 BDL 19 0.009 Total 473 2 of 2 253 883 0.4 Sodium Dissolved 22,520 2 of 2 6,170 82,200 17 Total 22,505 2 of 2 6,460 78,400 17 Thallium Dissolved 0.77 1 of 2 BDL 1.2 0.001 Tin Dissolved 3.49 1 of 2 BDL 6.1 0.003 Total 3.69 1 of 2 BDL 6.8 0.003 Titanium Total 4.15 1 of 2 BDL 6.9 0.003 Zinc Dissolved 26.0 2 of 2 23.4 28.8 0.02 Total 143 2 of 2 67.2 304 0.11 BDL = Below Detection Limit Log-normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., “non-detect” samples), estimated analyte concentrations equivalent to one-half of the detection levels were also used to calculate the log-normal mean. For example, if a“non-detect” sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the lognormal mean calculation.

### Boiler Blowdown 34 Table 3. Summary of Detected Analytes (Cont’d)

Constituents of Log Normal Frequency of Minimum Maximum Mass Loading

COPHOS Bottom Blowdown Mean Detection Concentration Concentration CLASSICALS (mg/L) (mg/L) (mg/L) (lbs/yr) Alkalinity 44.5 2 of 2 30 66 36 Ammonia As Nitrogen 0.13 2 of 2 0.12 0.14 0.1 Chloride 1.22 1 of 2 BDL 3 1 Hexane Extractable Material 3.26 1 of 2 BDL 6 3 Nitrate/Nitrite 0.44 2 of 2 0.24 0.81 0.4 Sulfate 4.47 1 of 2 BDL 8 4 Total Dissolved Solids 110 2 of 2 80 150 88 Total Kjeldahl Nitrogen 0.20 1 of 2 BDL 0.8 0.2 Total Organic Carbon (T OC ) 1.26 1 of 2 BDL 3.2 1 Total Phosphorous 21.8 2 of 2 15.3 31 17 Total Recoverable Oil And Grease 1.34 2 of 2 0.8 2.25 1 Total Sulfide (Iodometric) 3.08 1 of 2 BDL 19 2 Total Suspended Solids 3.46 1 of 2 BDL 6 3 Volatile Residue 42.0 2 of 2 22 80 34 HYDRAZINE (mg/L) (mg/L) (mg/L) (lbs/yr) Hydrazine 0.01 1 of 2 BDL 0.021 0.01 METALS ( μ g/ L) ( μ g/ L) ( μ g/

L) (lbs/yr) Aluminum Dissolved 58.2 2 of 2 56.6 91.7 0.05 Total 51.8 1 of 2 BDL 95.8 0.04 Antimony Dissolved 3.69 1 of 2 BDL 2.3 0.003 Barium Total 1.37 2 of 2 0.85 2.2 0.001 Calcium Total 73.5 2 of 2 48.9 200 0.06 Copper Dissolved 80.0 2 of 2 47.55 135 0.06 Total 1,724 2 of 2 662 4,490 1 Iron Total 1430 2 of 2 1210 1690 1 Lead Dissolved 2.12 2 of 2 1.5 3 0.002 Total 8.63 2 of 2 4.7 15.9 0.007 Magnesium Dissolved 40.4 1 of 2 BDL 70 0.032 Total 57.1 1 of 2 BDL 102 0.046

### Boiler Blowdown 35 Constituents of Log Normal Frequency of Minimum Maximum Mass Loading COPHOS Bottom Blowdown Mean Detection Concentration Concentration METALS (Cont’d) ( μ g/ L) ( μ g/ L) ( μ g/

L) (lbs/yr) Manganese Dissolved 2.24 2 of 2 1.7 5.4 0.002 Total 36.1 2 of 2 30.7 42.5 0.029 Molybdenum Dissolved 2.81 1 of 2 BDL 5.25 0.002 Total 2.79 1 of 2 BDL 5.2 0.002 Nickel Dissolved 15.8 2 of 2 12.95 19.4 0.013 Total 183 2 of 2 119 280 0.1 Sodium Dissolved 32,390 2 of 2 19,250 54,500 26 Total 38,737 2 of 2 28,500 52,650 31 Thallium Dissolved 0.65 1 of 2 BDL 1.2 0.001 Tin Dissolved 2.85 1 of 2 BDL 6.1 0.002 Titanium Total 3.61 1 of 2 BDL 7.9 0.003 Zinc Dissolved 8.02 1 of 2 BDL 14.3 0.01 Total 58.5 2 of 2 46.9 73 0.05 ORGANICS ( μ g/ L) ( μ g/ L) ( μ g/

L) (lbs/yr) Bis(2-Ethylhexyl) Phthalate 10.8 1 of 2 BDL 42 0.01 BDL = Below Detection Limit Log-normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., “non-detect” samples), estimated analyte concentrations equivalent to one-half of the detection levels were also used to calculate the log-normal mean. For example, if a“non-detect” sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the lognormal mean calculation.

### Boiler Blowdown 36 Table 4. Maximum Concentration of Constituents Detected in Nuclear Powered Ship Steam Generator Blowdown

Analyte SSN & SSBN CVN 68 Class CVN 65

Submarines Carriers Only Metals μ g/L μ g/L μ g/L Aluminum 40 20 20 Antimony 5 U U Arsenic 3 20 U Barium 1 10 U Cadmium 2 10 10 Calcium 4 70 150 Chromium 2 5 50 Copper 40 150 50 Iron 50 20 80 Lead 10 15 50 Magnesium 1 15 200 Manganese 1 20 20 Molybdenum 20 20 U Nickel 25 30 90 Silver 1 20 U Sodium 160,000 160,000 360,000 Tin 2 20 U Titanium 3 10 U Zinc 4 10 50

Classicals mg/L mg/L mg/L Ammonia 0.30 0.30 0.30 Chemical Oxygen Demand 30.00 30.00 30.00 Chloride 0.05 0.05 0.05 Nitrate + Nitrite (as N) 70.00 70.00 70.00 Sulfate 300.00 300.00 300.00 Sulfide 2.00 2.00 2.00 Total Dissolved Solids 1000.00 1000.00 1000.00 Total Kjeldahl Nitrogen 16.00 16.00 16.00 Total Organic Carbon 3.00 3.00 3.00 Total Phosphorous 100.00 100.00 100.00 Total Suspended Solids 2.00 2.00 2.00

Organics mg/L mg/L mg/L Hydrazine 0.10 0.10 0.10 Note: U = Analyte analyzed for but not detected

### Boiler Blowdown 37 Table 5. Estimated Annual Mass Loadings of Constituents for Conventionally Powered

Steam Boilers and Auxiliary and Waste Heat Boilers

Constituents of Concentration Estimated Annual Chelant Surface Blowdown Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 0.44 1 Nitrate/Nitrite 0.23 1 Total Kjeldahl Nitrogen 2.5 7 Total Nitrogen A 2.8 8 Total Phosphorous 0.97 3 METALS ( μ g/L ) (lbs/yr) Copper Dissolved 207 1 Total 203 1 Iron Dissolved 626 2 Total 884 2 Nickel Dissolved 1,860 5 Total 1,810 5 Zinc Dissolved 594 2 Total 601 2

Constituents of Concentration Estimated Annual Chelant Bottom Blowdown Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 0.11 0.2 Nitrate/Nitrite 0.39 1 Total Kjeldahl Nitrogen 0.47 1 Total Nitrogen A 0.86 2 Total Phosphorous 8.4 17 METALS ( μ g/L ) (lbs/yr) Copper Dissolved 75.9 0.2 Total 40.6 0 Iron Total 344 1 Nickel Dissolved 1,740 4 Total 1,835 4 Zinc Dissolved 377 1 Total 382 1 A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Boiler Blowdown 38 Table 5. Estimated Annual Mass Loadings of Constituents for Conventionally Powered

Steam Boilers and Auxiliary and Waste Heat Boilers (Cont'd)

Constituents of Concentration Estimated Annual Magnetic Surface Blowdown Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 0.22 0.1 Nitrate/Nitrite 0.78 0.2 Total Kjeldahl Nitrogen 1 0.3 Total Nitrogen A 1.8 0.5 Total Phosphorous 0.05 0.01 METALS ( μ g/ L) (lbs/yr) Copper Dissolved 15.8 0.004 Total 64.9 0.02 Iron Total 4170 1 Lead Dissolved 22.8 0.006 Total 193 0.054 Nickel Total 27.6 0.01

Constituents of Concentration Estimated Annual Magnetic Bottom Blowdown Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 1.4 0.4 Nitrate/Nitrite 0.93 0.3 Total Nitrogen A 0.93 0.3 Total Phosphorous 0.14 0.04 METALS ( μ g/L) (lbs/yr) Copper Total 63.1 0.02 Iron Total 1855 1 Lead Total 41.7 0.012 Nickel Total 14.7 0.004 A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Boiler Blowdown 39 Table 5. Estimated Annual Mass Loadings of Constituents for Conventionally Powered

Steam Boilers and Auxiliary and Waste Heat Boilers (Cont'd)

Constituents of Concentration Estimated Annual Drew Surface Blowdown Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 1.8 2 Nitrate/Nitrite 115 125 Total Kjeldahl Nitrogen 10 11 Total Nitrogen A 125 136 Total Phosphorous 0.26 0.3 METALS (lbs/yr) Copper Dissolved 14.8 0 Total 2,340 3 Iron Total 24,800 27 Lead Total 463 1 Nickel Total 125 0.1 Zinc Total 7,850 9 ORGANICS ( μ g/L) (lbs/yr) Bis(2-Ethylhexyl) Phthalate 16 0.02

Constituents of Concentration Estimated Annual Drew Bottom Blowdown Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 1.5 2 Nitrate/Nitrite 0.32 0.4 Total Kjeldahl Nitrogen 11 12 Total Nitrogen A 11 12 METALS ( μ g/ L) (lbs/yr) Copper Dissolved 127 0.1 Total 153 0.2 Iron Total 1,001 1 Lead Total 7.35 0.01 Nickel Total 12.6 0.01 Zinc Dissolved 97.8 0.1 Total 277 0.3 ORGANICS ( μ g/L) (lbs/yr) Bis(2-Ethylhexyl) Phthalate 13 0.01 A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Boiler Blowdown 40 Table 5. Estimated Annual Mass Loadings of Constituents for Conventionally Powered

Steam Boilers and Auxiliary and Waste Heat Boilers (Cont'd)

Constituents of Log Normal Estimated Annual COPHOS Surface Blowdown Mean Concentration Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 0.21 0.2 Nitrate/Nitrite 0.45 0.3 Total Kjeldahl Nitrogen 0.45 0.3 Total Nitrogen A 0.9 0.6 Total Phosphorous 11.5 9 METALS ( μ g/L) (lbs/yr) Copper Dissolved 103 0.08 Total 3,390 2.60 Iron Dissolved 440 0.34 Total 4,327 3.32 Lead Total 22.4 0.02 Nickel Dissolved 12.3 0.01 Total 472.7 0.36 Zinc Total 143 0.11

Constituents of Log Normal Estimated Annual COPHOS Bottom Blowdown Mean Concentration Mass Loading CLASSICALS (mg/L) (lbs/yr) Ammonia as Nitrogen 0.13 0.1 Nitrate/Nitrite 0.44 0.4 Total Kjeldahl Nitrogen 0.2 0.2 Total Nitrogen A 0.64 0.6 Total Phosphorous 21.8 17 METALS ( μ g/ L) (lbs/yr) Copper Dissolved 80.0 0.06 Total 1,724 1.38 Iron Total 1430 1.14 Lead Total 8.63 0.01 Nickel Dissolved 15.8 0.01 Total 183 0.15 ORGANICS ( μ g/L) (lbs/yr) Bis(2-Ethylhexyl) Phthalate 10.8 0.01 A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Boiler Blowdown 41 Table 6. Mass Loadings for Nuclear Powered Ship Steam Generators

Analyte Discharge

Concentration from CVN 65 ( μ g/L) Discharge

Concentration from CVN 68 ( μ g/L) Discharge

Concentration from Submarines ( μ g/L) Total Loading for

1 CVN 65 per year* (pounds/year) Total Loading for

7 CVN 68s per year* (pounds/year) Total Loading for 72

SSNs and 17 SSBNs per year* (pounds/year) Total Loading From All

Steam Generator ships and subs within 12 n.m. (pounds/year) Copper 50 150 40 0.09 2.72 0.41 3.22 Lead 50 15 10 0.09 0.27 0.10 0.47 Nickel 90 30 25 0.17 0.54 0.25 0.97 Ammonia 30 30 30 0.06 0.54 0.30 0.90 Nitrate/Nitrite 70,000 70,000 70,000 126 1270 710 2106 Total Kjeldahl Nitrogen 16,000 16,000 16,000 28.8 290 162 481

Total Nitrogen A 86,000 86,000 86,000 155 1560 872 2587 Total Phosphorous 100,000 100,000 100,000 190 1800 1000 2990

Notes: * = Loadings are based on total volumes within 12 n.m. including 225,000 gallons per year for CVN 65, 310,000 gallons per year for CVN 68 Class, 16,000 gallons per year each SSN Class vessel, and 4,000 gallons per year for each SSBN Class vessel. A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Boiler Blowdown 42 Table 7. Naval Nuclear Propulsion Summary of Steam Generator Safety

Valve Testing Loadings Per Year (maximum values)

Material Discharged Loading for Submarines and Cruisers (pounds per vessel, per year) Total Loading for all Submarines and Cruisers (pounds per year) Total Loading for Carriers (pounds per vessel, per year) Total Loading for all Carriers (pounds per year)

Phosphorous (as phosphate) 0.003 0.3 0.006 (CVN 65 only) 0.006 Sulfur (as sulfite and sulfate) 0.000 0 0.008 (CVN 65 only) 0.008 Nitrogen (as nitrite or nitrate) 0.001 0.1 0.000 0 Nitrogen (as amines) 0.03 3 0.08 0.64 Hydrazine 0.000 0 0.001 0.008 Organic Acids 0.001 0.1 0.001 0.008 Sodium 0.002 0.2 0.007 (CVN 65 only) 0.007 Total 3.7 0.68 Note: Information taken from NAVSEA 08 summary information, May 1997. 15

### Boiler Blowdown 43 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituents of Concentration Federal Acute Most Stringent State Chelant Surface Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) Ammonia as Nitrogen 440 None 6 (HI) A Nitrate/Nitrite 230 None 8 (HI) A Total Kjeldahl Nitrogen 2500 None

- Total Nitrogen B 2800 None 200 (HI) A Total Phosphorous 970 None 25 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) Copper Dissolved 207 2.4 2.4 (CT, MS) Total 203 2.9 2.5 (WA) Iron Dissolved 626 None 300 (FL) Total 884 None 300 (FL) Nickel Dissolved 1,860 74 74 (CA, CT) Total 1,810 74.6 8.3 (FL, GA) Zinc Dissolved 594 90 90 (CA, CT, MS) Total 601 95.1 84.6 (WA)
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA= California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Boiler Blowdown 44 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria (Cont’d)

Constituents of Concentration Federal Acute Most Stringent State Chelant Bottom Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) Ammonia as Nitrogen 110 None 6 (HI) A Nitrate/Nitrite 390 None 8 (HI) A Total Kjeldahl Nitrogen 470 None

- Total Nitrogen B 860 None 200 (HI) A Total Phosphorous 8400 None 25 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) Copper Dissolved 75.9 2.4 2.4 (CT, MS) Total 40.6 2.9 2.5 (WA) Iron Total 344 None 300 (FL) Nickel Dissolved 1,740 74 74 (CA, CT) Total 1,835 74.6 8.3 (FL, GA) Zinc Dissolved 377 90 90 (CA, CT, MS) Total 382 95.1 84.6 (WA)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA= California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Boiler Blowdown 45 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria (Cont’d)

Constituents of Concentration Federal Acute Most Stringent State Magnetic Surface Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) Ammonia as Nitrogen 220 None 6 (HI) A Nitrate/Nitrite 780 None 8 (HI) A Total Kjeldahl Nitrogen 1000 None

- Total Nitrogen B 1800 None 200 (HI) A Total Phosphorous 50 None 25 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) Copper Dissolved 15.8 2.4 2.4 (CT, MS) Total 64.9 2.9 2.5 (WA) Iron Total 4,170 None 300 (FL) Lead Total 193 217.2 5.6 (FL, GA) Nickel Total 27.6 74.6 8.3 (FL, GA)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Boiler Blowdown 46 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria (Cont’d)

Constituents of Concentration Federal Acute Most Stringent State Magnetic Bottom Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) Ammonia as Nitrogen 1400 None 6 (HI) A Nitrate/Nitrite 780 None 8 (HI) A Total Nitrogen B 780 None 200 (HI) A Total Phosphorous 140 None 25 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) Copper Total 63.1 2.9 2.5 (WA) Iron Total 1855 None 300 (FL) Lead Total 41.7 217.2 5.6 (FL, GA) Nickel Total 14.7 74.6 8.3 (FL, GA)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

FL = Florida GA = Georgia HI = Hawaii WA = Washington

### Boiler Blowdown 47 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria (Cont’d)

Constituents of Concentration Federal Acute Most Stringent State Drew Surface Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) Ammonia as Nitrogen 1800 None 6 (HI) A Nitrate/Nitrite 115,000 None 8 (HI) A Total Kjeldahl Nitrogen 10,000 None

- Total Nitrogen B 125,000 None 200 (HI) A Total Phosphorous 260 None 25 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) Copper Dissolved 14.8 2.4 2.4 (CT, MS) Total 2,340 2.9 2.5 (WA) Iron Total 24,800 None 300 (FL) Lead Total 463 217.2 5.6 (FL, GA) Nickel Total 125 74.6 8.3 (FL, GA) Zinc Total 7,850 95.1 84.6 (WA) ORGANICS ( μ g/L) ( μ g/L) Bis(2-Ethylhexyl) Phthalate 16 None 5.92 (GA)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Boiler Blowdown 48 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria (Cont’d)

Constituents of Concentration Federal Acute Most Stringent State Drew Bottom Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) Ammonia as Nitrogen 1500 None 6 (HI) A Nitrate/Nitrite 320 None 8 (HI) A Total Kjeldahl Nitrogen 11,000 None

- Total Nitrogen B 11,000 None 200 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) Copper Dissolved 127 2.4 2.4 (CT, MS) Total 153 2.9 2.5 (WA) Iron Total 1,001 None 300 (FL) Lead Total 7.35 217.2 5.6 (FL, GA) Nickel Total 12.6 74.6 8.3 (FL, GA) Zinc Dissolved 97.8 90 90 (CA, CT, MS) Total 277 95.1 84.6 (WA) ORGANICS ( μ g/L) ( μ g/L) Bis(2-Ethylhexyl) Phthalate 13 None 5.92 (GA)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Boiler Blowdown 49 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria (Cont’d)

Constituents of COPHOS Log Normal

Mean Minimum

Concentration Maximum

Concentration Federal

Acute Most Stringent

State Surface Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) Ammonia as Nitrogen 210 110 390 None 6 (HI) A Nitrate/Nitrite 450 240 850 None 8 (HI) A Total Kjeldahl Nitrogen 450 280 710 None

- Total Nitrogen B 900 None 200 (HI) A Total Phosphorous 11,500 2600 51,000 None 25 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) Copper Dissolved 103 56.7 187 2.4 2.4 (CT, MS) Total 3,390 1,310 8,780 2.9 2.5 (WA) Iron Dissolved 440 334 579 None 300 (FL) Total 4,327 2,480 7,550 None 300 (FL) Lead Total 22.4 8.2 61.4 217.2 5.6 (FL, GA) Nickel Dissolved 12.3 BDL 19 74 74 (CA, CT) Total 473 253 883 74 8.3 (FL, GA) Zinc Total 143 67.2 304 95.1 84.6 (WA)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA= California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington BDL = Below Detection Limit

### Boiler Blowdown 50 Table 8. Mean Concentrations of Constituents that Exceed Water Quality Criteria (Cont’d)

Constituents of COPHOS Log Normal

Mean Minimum

Concentration Maximum

Concentration Federal

Acute Most Stringent

State Bottom Blowdown WQC Acute WQC CLASSICALS ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) Ammonia as Nitrogen 130 120 140 None 6 (HI) A Nitrate/Nitrite 440 240 810 None 8 (HI) A Total Kjeldahl Nitrogen 200 BDL 800 None

- Total Nitrogen B 640 None 200 (HI) A Total Phosphorous 21,800 15,300 31,000 None 25 (HI) A METALS ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) Copper Dissolved 80.0 47.6 135 2.4 2.4 (CT, MS) Total 1,724 662 4490 2.9 2.5 (WA) Iron Total 1,430 1,210 1,690 None 300 (FL) Lead Total 8.63 4.7 15.9 217.2 5.6 (FL, GA) Nickel Dissolved 15.8 12.95 19.4 74 74 (CA, CT) Total 183 119 280 74.6 8.3 (FL, GA) ORGANICS ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) Bis(2-Ethylhexyl) Phthalate 10.8 BDL 42 None 5.92 (GA)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA= California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington BDL = Below Detection Limit

### Boiler Blowdown 51 Table 9. Concentrations of Constituents that Exceed Water Quality Criteria for Nuclear

Powered Steam Generators (maximum values) ( μ g/L)

Analyte Discharge

Concentration from Submarines Discharge

Concentration from CVN 68 Class carriers Discharge

Concentration from CVN 65 Class carrier Federal

Acute WQC Most Stringent

State Acute WQC

Copper 40 150 50 2.4 2.4 (CT, MS) Lead 10 15 50 210 5.6 (FL, GA) Nickel 25 30 90 74 8.3 (FL, GA) Ammonia 30 30 90 None 6 (HI) A Nitrate/Nitrite 70,000 70,000 70,000 None 8 (HI) A Total Kjeldahl Nitrogen 16,000 16,000 16,000 None

-

Total Nitrogen B 86,000 86,000 86,000 None 200 (HI) A

Phosphorous 100,000 100,000 100,000 None 25 (HI) A
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria. A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi



### Table 10. Summary of Thermal Effects of Boiler Blowdown Discharge

Ship Modeled Discharge

Temp (°F) Discharge

Volume (gals) Ambient

Water Temp ( ° F) Predicted

Plume Width and Length (m)* Allowable

Plume Width (m) Allowable

Plume Length (m) Predicted

Plume Depth (m)

Washington State (0.3°C Δ T) LHA 1 503 310 50 19.7 400 73 4 AFS 1 495 150 50 13.4 400 73 4 Virginia (3.0°C Δ T) LHA 1 503 310 40 5.5 3,200 32,000 4 AFS 1 495 150 40 3.7 3,200 32,000 4 Note: The discharge was modeled such that the resultant plume is cylindrical shaped, therefore the plume width and length are equal.

### Boiler Blowdown 52 Table 11. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X 4.3 Thermal Effects X4.4 Potential for Introducing NonIndigenous Species X

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Catapult Water Brake Tank and Post Launch Retraction Exhaust

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 2 2.0 DISCHARGE DESCRIPTION
This section describes the catapult water brake tank and post launch retraction exhaust and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Every Navy aircraft carrier is equipped with four steam catapults for launching aircraft. High pressure steam from the catapult wet steam accumulator is used to operate each catapult. Each catapult has a dedicated water brake tank and catapult steam exhaust piping. During each catapult cycle, lubricating oil is applied to the catapult power cylinder. Different amounts of lubricating oil are applied depending on catapult model. Mod 2 catapults use more lubricating oil per catapult cycle than Mod 1 catapults (see Section 3.2.1).
Catapults are operated every time an aircraft is launched a nd for testing purposes. Catapults are normally tested after an aircraft carrier is built, before an aircraft carrier is sent out on deployment, and after major repairs and overhauls. Catapult testing before deployments is called “no-load” testing because there is no load applied to the catapult. Catapult testing after building and after major repairs and overhauls is called “dead-load” testing because a weight is applied to the catapult to simulate the weight of an aircraft. During catapult testing, lubricating oil is supplied to the catapult’s power cylinder in the same fashion as during aircraft launching operations.
The forward motion of the catapult piston is stopped by means of a water brake that is supplied by high pressure water from the water brake tank. As the catapult operates, the lubricating oil is carried into the water brake and subsequently into the water brake tank. During the retraction of the catapult piston, the steam left in the power cylinder and a small amount of residual oil are discharged overboard through the catapult exhaust piping. A smaller fraction of the residual oil also leaks by the catapult cylinder sealing strips and into the catapult trough. Catapult trough discharge is addressed in a separate NOD report on deck runoff.

2.1.1 Catapult Water Brake Tank
The catapult water brake tank supplies freshwater to the catapult water brake, which is used to stop the forward motion of the catapult piston. Water from the catapult water brake tank is injected into the water brake during each catapult cycle at approximately 1,300 gallons per minute (gpm) using two 650-gpm pumps. 1 

### When the catapult piston enters the water brake, it forces water from the water brake into the upper portion of the water brake tank. Figure 1 provides an illustration.
The oil used to lubricate the catapult power cylinder conforms to both SAE J1966, Grade 60 and Military Specification MIL-L-6082E grade 1100 standards. 2 

### During each catapult cycle, oil is sprayed onto the internal surface of the catapult power cylinder. As the catapult piston

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 3 travels down the catapult power cylinder, lubricating oil is carried with the catapult piston into the water brake. 1 

### Over the course of multiple launches, and because water is recirculated through the catapult water brake and the water brake tank, oil builds up in the water brake tank. The oil accumulates on the surface of the water in the water brake tank in the form of an oil-water emulsion. Heat is added to the water from heat accumulated in the oil, the action of the pistons, and by conduction from the steam-heated catapult piston. The accumulated oil also inhibits cooling at the surface of the water brake tank. Consequently, the water temperature rises. Excessive water temperature adversely affects the catapult water brake performance.
To prevent excessive water temperatures in the water brake tank, the accumulated oil is periodically skimmed. The water brake tank is equipped with an oil-skimming funnel and a 2.5- inch pipe for draining the oil from the tank. Fresh cool water is added to the water brake tank via a freshwater fill line to raise the water level in the tank, thus causing the floating oil and oil/water mixture to flow into the skimming funnel. The funnel drain piping discharges the oil and oil/water mixture overboard above the waterline. The contents of the water brake tank drain overboard until the liquid level falls below the top of the drain funnel. Oil accumulation in the water brake tank is directly related to the number of catapult cycles. During aircraft launch operations, the water brake tank is skimmed on an as-needed basis. 3



### As mentioned previously, aircraft carriers perform no-load catapult tests before leaving port on deployment and dead-load tests after building, major repairs and overhauls. The number of no-load and dead-load tests, however, do not generate enough lubricating oil in the water brake tank to require that the tank to be skimmed within 12 nautical miles (n.m.).

2.1.2 Post-Launch Retraction Exhaust

Dur ing the post-launch retraction of the catapult piston, the expended steam and residual oil from the catapult power cylinder walls are discharged overboard below the water line through copper/nickel piping. The exhaust steam exits the catapult power cylinder at approximately 350

o 

### F (i.e., the operating temperature of the catapults) and cools and condenses as it flows through the exhaust piping overboard. The temperature of the final discharge is estimated to be 200 o 

### F.

2.2 Releases to the Environment

2.2.1 Water Brake Tank
Discharge from the water brake tank is released overboard above the water line and consists of freshwater, lubricating oil, and small amounts of metals introduced by the catapult systems.

2.2.2 Post-Launch Retraction Exhaust
Discharge from the post-launch retraction exhaust is released overboard below the water line and consists of condensed steam with lubricating oil and small amounts of metals from the catapult.

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 4 2.3 Vessels Producing the Discharge
The Navy’s aircraft carriers are the only armed forces vessels that generate this discharge. Of the 11 aircraft carriers that are homeported in the United States, eight are equipped with Mod 1 catapults, and the three newest aircraft carriers are equipped with Mod 2 catapults. There are a total of 12 aircraft carriers

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality

3.1.1 Catapult Water Brake Tank
The catapult water brake tank discharge is generated on an as-needed basis during aircraft carrier flight operations, which occur beyond 12 n.m. from shore. 1,4,5 

### Catapult testing, which occurs within 12 n.m. does not generate a sufficient quantity of oil in the water brake tank to require discharge. In addition, OPNAVINST 5090.1B prohibits oil from being discharged within 12 n.m. of shore, including the oil contained in this discharge.
Because this discharge does not occur within 12 n.m. of shore, it is not discussed further in this report.

3.1.2 Post-Launch Retraction Exhaust
The post-launch retraction exhaust discharge is generated during all catapult operations including aircraft launching and catapult testing. Because catapults are operated within 12 n.m. of shore during no-load/dead-load testing, the post-launch retraction exhaust discharge occurs on a limited basis within 12 n.m.

3.2 Rate
The discharge for the post-launch retraction exhaust discharge consists of condensed steam and the residual oil from lubricating the catapult power cylinders. During each catapult cycle, approximately 1,000 pounds of water from the wet accumulator are flashed to steam to drive the catapult piston down the flight deck, and 0.415 gallon of oil is injected onto the catapult power cylinder wall for Mod 1 catapults, and 0.83 gallon of oil for Mod 2 catapults. 6 

### Based on operating experience, approximately 890 pounds of water and 0.10 gallon of oil from Mod 1 catapults, or 0.42 gallon of oil from Mod 2 catapults, are discharged overboard during each

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 5 catapult cycle. 6



### An aircraft carrier performs approximately 50 no-load catapult tests per year. 3 

### Therefore, all 11 aircraft carriers homeported in the United States perform approximately 550 no-load test shots per year. At a fleet-wide average rate of 0.19 gallon of oil (weighted average discharge of 0.10 gallon for Mod 1 catapults and 0.42 gallon for Mod 2 catapults) and 890 pounds of steam condensate per each catapult test, the annual fleet-wide discharge of oil and condensed steam from no-load catapult tests within 12 n.m. is approximately 105 gallons of oil and 490,000 pounds of condensed steam.
Major catapult overhauls and modifications are not normal occurrences for aircraft carriers. In general, one to two aircraft carriers annually undergo a major overhaul or modification that requires 60 dead-load catapult test shots to recertify the catapult. Assuming that on average, the catapults on 1.5 carriers are overhauled each year (i.e., six catapults), an estimated 360 dead-load catapult test shots are performed annually fleet-wide within 12 n.m. Thus, an estimated 69 gallons of oil (at a rate of 0.19 gallon per test) and 320,000 pounds of steam condensate (at a rate of 890 pounds per test) are discharged annually from dead-load catapult testing.
Thus, 174 gallons of oil and 810,000 pounds of condensed steam (~97,000 gallons) are discharged annually, fleetwide, from post-launch retraction exhaust during no-load and dead-load catapult testing.

3.3 Constituents
The post-launch retraction exhaust discharge consists of steam and condensed steam with associated non-organic metal constituents and lubricating oil. The lubricating oils are comprised primarily of higher chain (C 17 

### and higher) paraffins and olefins. 7,8 

### Another UNDS discharge, Steam Condensate Discharge, is similar to the condensed steam discharge from the catapult retraction stroke, with the exception of the oil content. The Steam Condensate NOD Report analyzes steam condensate originating from shore-based facilities. The steam condensate from ship heating supplied from shore facilities consists primarily of condensed steam that is generally collected and pumped or drained overboard. The discharge from the catapult retraction exhaust is steam, condensed steam, and oil that is vented overboard under pressure. The condensed steam portion of both discharges will, however, be somewhat similar. Based on the data presented in that report, nitrogen (as ammonia, nitrate/nitrite, and total nitrogen), phosphorous, and the priority pollutants antimony, arsenic, benzidine, bis(2-ethylhexyl) phthalate, cadmium,copper, lead, nickel, selenium, thallium, and zinc can be present in the condensed steam in postlaunch retraction exhaust. There are no known bioaccumulators in this discharge.

3.4 Concentrations
Approximately 890 pounds of catapult condensed steam and 0.19 gallon of oil is discharged during each catapult cycle. The density of water at 70 o 

### F (i.e., ambient temperature) is 8.32 pounds per gallon (lbs/gal) or 0.998 kilograms per liter (kg/l) and the oil density is of 7.32

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 6 lbs/gal or 0.878 kg/l. Therefore, the concentration of oil in the exhaust discharge is approximately 1,560 mg/L. The calculation is presented below:

Where the subscripts o refer to oil and w refer to water

. 

### Table 1 shows the concentrations of the priority pollutants identified in the Steam Condensate NOD Report. It is assumed that the same constituents would be found in the condensed steam from the catapult retraction exhaust in similar concentrations to those found in steam condensate originating from facilities.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristi cs presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria.Section 4.3 discusses thermal effects. In Section 4.4, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
As estimated in Section 3.2, approximately 174 gallons of oil are discharged annually from no-load and dead-load testing in post-launch retraction exhaust. This results in an annual fleet-wide mass loading of 1,275 pounds (based on a conversion factor of 7.33 pounds of oil/gallon).
Of the non-oil constituents in the 810,000 pounds of catapult condensed steam generated annually fleet wide from post-launch retraction exhaust (see Section 3.2) less than one pound of pollutants are estimated to be discharged from no-load and dead-load testing. The mass loadings were estimated using the following equation:

4.2 Environmental Concentrations
The condensed steam and oil from the post-launch retraction exhaust exits the ship via the exhaust piping. The estimated concentration of oil in the discharge is approximately 1,560 mg/L. This value exceeds the most stringent state water quality criteria (WQC), which is Florida’s 5 mg/L criterion (Table 2). Concentrations this high are likely to cause a sheen in the [(0.19 gal o 

### ) (7.32 lbs o 

### /gal o 

### )(453,590 mg/lb)] /[(890 lbs w 

### )(gal/8.32 lbs w 

### )(3.785 l/gal)] =

≅ 1560 mg/ l



### (log-normal mean conc. μ g/l)(g/1,000,000 μ g) (lbs/453.593 g) (annual volume l/yr) ≅ mass loading (lbs/yr)

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 7 receiving waters.
Assuming the concentrations of the priority pollutants shown in Table 1 are representative of condensed steam discharged in post-launch retraction exhaust discharge, there would be four priority pollutants - benzidine, bis(2-ethylhexyl) phthalate, copper, and nickel - discharged in excess of Federal and/or the most stringent state WQC. Two other constituents, nitrogen (as ammonia, nitrate/nitrite, and total nitrogen) and phosphorous, exceed the most stringent state WQC. Table 2 shows the concentrations of these constituents and the applicable WQC.

4.3 Thermal Effects
The thermal effects of the post-launch retraction exhaust were screened for potential adverse effects to determine if the resulting thermal plume exceeded water quality criteria for temperature. 9 

### Based upon the evaluation of the exhaust discharge, the thermal effects rapidly dissipate within a short distance of the point of discharge. 9 

### Under the most stringent criteria (e.g., Washington State), the resulting plume from the post-launch retraction exhaust is estimated to be approximately 20 feet in diameter and extends to approximately 12 feet in depth. 9 

### These dimensions are within limits established for Washington. 9



### 4.4 Potential for Introducing Non-Indigenous Species
During catapult launch operations, seawater is not transported. Therefore, there is no potential for transporting non-indigenous species.

5.0 CONCLUSIONS
The catapult water brake tank discharge does not occur within 12 n.m. because flight operations are not conducted within this zone. Therefore, this discharge has no potential to cause an adverse environmental effect within 12 n.m.
The post-launch retraction exhaust has a potential for adverse environmental effect because significant amounts of oil are discharged at high concentrations during the short duration of the discharge event. The high concentrations exceed water quality criteria and discharge standards. The high concentrations of oil are likely to cause an oil sheen.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. process information and assumption were used to estimate the rate of discharge. Based on this estimate and on the reported concentration of oil constituents, the concentration of the oil constituents in the environment resulting from this discharge were then estimated. Table 3 shows the source of the data used to develop this NOD report.

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 8 Specific References

1. UNDS Equipment Expert Meeting Minutes - Catapult Discharges. July 26, 1996.

2. Commander, Naval Sea Systems Command. Memorandum Ser PMS312B/1760. Pollution of Coastal Waters Attributed to Catapult Lube Oil. December 16, 1997.

3. Commander Naval Air Forces, U.S. Atlantic Fleet. Responses to TYCOM Questionnaire. M. Rosenblatt & Son, Inc. May 20, 1997.

4. UNDS Equipment Expert Meeting Minutes - Catapult Trough, Water Brake Tank, Jet Blast Deflector and Arresting Cables. August 22, 1996.

5. UNDS Equipment Expert Meeting Minutes - Catapult Wet Accumulator Steam Blowdown Discharge. August 20, 1997.

6. Steve Opet, NAWCADLKE. Information on Volume of Water and Temperature for Catapult Shots. April 11, 1997. Clarkson Meredith, Versar, Inc.

7. Perry and Chilton. Chemical Engineers’ Handbook. Fifth Ed. McGraw Hill. 1953

8. Patty's Industrial Hygiene and Toxicology, 3rd Ed., Volume IIB. G.D. and F.E. Clayton, Editors. New York: 1981.

9. NAVSEA. Thermal Effects Screening of Discharges from Vessels of the Armed Services. Versar, Inc. July 3, 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 9 Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
U.S. Navy Technical Manual NAVAIR 51-15ABD-3, Illustrated Parts Breakdown Catapults. December 1, 1986.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, pg 15366. March 23, 1995.
Committee Print Number 95-30 of the Committee of Public Works and Transportation of the House of Representatives, Table 1.
Jane's Information Group, Jane's Fighting Ships. Capt. Richard Sharpe, Ed. Sentinel House: Surrey, United Kingdom, 1996.
UNDS Phase I Sampling Data Report, Volumes 1-13. October 1997.

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 10 Table 1. Estimated Post-Launch Retraction Exhaust Discharge Constituents, Concentrations, and Mass Loadings Based Upon Steam Condensate Sampling Data

Constituents Concentrations ( μ g/L)

Log Normal Rate of Wet Accumulator Fleet-Wide Mass

Loading From Steam Condensate 1 Mean 2 Range Discharge (l/yr) 3 (pounds/yr) Antimony Total 7.13 BDL - 26.8 367,000 5.8 x 10 -3 Arsenic Total 0.74 BDL - 2.3 367,000 6.0 x 10 -4 Cadmium Total 2.86 BDL - 6.1 367,000 2.3 x 10 -3 Copper Dissolved 13.4 BDL - 49.0 367,000 1.1 x 10 -2 Total 20.1 BDL - 91.0 367,000 1.6 x 10 -2 Lead Dissolved 3.58 BDL - 12.7 367,000 2.9 x 10 -3 Total 4.38 BDL - 18.9 367,000 3.5 x 10 -3 Nickel Dissolved 10.3 BDL - 22 367,000 8.3 x 10 -3 Total 11.6 BDL - 34.7 367,000 9.4 x 10 -3 Selenium Total 2.87 BDL - 3.5 367,000 2.3 x 10 -3 Thallium Dissolved 1.18 BDL - 13.3 367,000 9.5 x 10 -4
Zinc Dissolved 13.94 7.15 - 21.9 367,000 1.1 x 10 -2 Total 11.35 BDL - 23.0 367,000 9.2 x 10 -3 Ammonia as Nitrogen 180 120 - 370 367,000 1.4 x 10 -1 Nitrate/Nitrite 440 300 - 810 367,000 3.4 x 10 -1 Total Kjeldahl Nitrogen 1240 NA 367,000 9.6 x 10 -1 Total Phosphorous 90 BDL - 270 367,000 7.1 x 10 -2 Benzidine 32.8 BDL - 73.5 367,000 2.7 x 10 -2 Bis(2-ethylhexyl) phthalate 19.4 BDL - 112 367,000 1.6 x 10 -2 The constituents listed above are those expected to be found in the wet accumulator discharge. BDL denotes below detection limit.

1. Constituents listed are the priority pollutants detected in steam condensate samples. 2. Highest of the dissolved and total log a verage values. 3. This value is the product of the annual condensed steam released from no-load and dead-load testing (810,000 pounds combined) cited in Section 3.2.1 and the conversion factors 0.0175 cubic foot/pound (inverse density of water at 200 o F), 7.4805 gallons/cubic foot, and 3.785 liters/gallon.
Log-normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., “non-detect” samples), estimated analyte concentrations equivalent to one-half of the detection levels were also used to calculate the log-normal mean. For example, if a“non-detect” sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the lognormal mean calculation.

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 11 Table 2. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Post-Launch Retraction Exhaust Condensed Steam Discharge

Constituent Log-Normal Mean

Concentration ( μ g/L) Federal Acute WQC ( μ g/L) Most Stringent State Acute WQC ( μ g/L) Oil 1,560,000 visible sheen 1 /15,000 2 5,000 (FL) Ammonia as Nitrogen 180 None 6 (HI) A

Nitrate/Nitrite 440 None 8 (HI) A Total Nitrogen 1240 None 200 (HI) A Total Phosphorous 90 None 25 (HI) A Benzidine 32.8 None 0.000535 (GA) Bis(2-Ethylhexyl) Phthalate 19.4 None 5.92 (GA)

Copper

3 Dissolved 13.4 2.4 2.4 (CT, MS) Total 20.1 2.9 2.5 (WA) Nickel 3 Dissolved 10.3 74 74 (CA, CT) Total 11.6 74.6 8.3 (FL, GA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values.

1 Discharge of Oil. 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. 2 International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS). 3 Assumes the constituents and their concentrations in this discharge are similar in concentration to the constituents found in steam condensate that originates from shore facilities.

CA = California CT = Connecticut FL = Florida GA = Georgia HI= Hawaii MS = Mississippi WA = Washington

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 12 Table 3. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X 4.3 Thermal Effects X4.4 Potential for Introducing NonIndigenous Species X

### Catapult Water Brake Tank and Post Launch Retraction Exhaust 13 Fig. 1 Water Brakes

### Catapult Wet Accumulator Discharges 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the disc harges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in deta il, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Catapult Wet Accumulator Discharges

### Catapult Wet Accumulator Discharges 2 2.0 DISCHARGE DESCRIPTION
This section describes the catapult wet accumulator discharges and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Aircraft are launched from aircraft carriers using a steam driven catapult piston. Steam is supplied to a catapult from a 16,000-gallon pressure vessel known as a catapult wet accumulator. The wet accumulator contains a mixture of steam and saturated water at a high temperature and pressure. As steam is released from the accumulator for a launch, the pressure drops in the accumulator and water flashes to steam producing additional steam. The pressure from the steam against the catapult piston forces the piston to accelerate rapidly, providing sufficient force and velocity to launch the aircraft. 1 

### Each aircraft carrier has four catapults.
Approximately 8,000 gallons of boiler feedwater are used when initially filling an accumulator on conventionally-powered aircraft carriers. Similarly, 8,000 gallons of steam generator feedwater are used when initially filling an accumulator on nuclear-powered aircraft carriers. Feedwater from boilers and steam generators contain similar constituents. Feedwater is distilled fresh water from the ship’s water generating plant. Steam from the ship’s main steam plant is used to maintain the water level and to pressurize the accumulator to between 450 and 520 pounds per square inch (psi). 2 

### The steam is provided to the accumulator through a manifold that distributes the steam below the water level in the accumulator. Figures 1 and 2 show a schematic of a wet accumulator and its associated external and internal piping.
The continuous addition and condensation of steam during flight operations, while standing by for flight operations, or during catapult testing causes the water level in an accumulator to rise. Blowdowns are required to keep water level within operating limits, normally 40 to 50 inches of water. 2 

### Blowdowns to control water levels release up to 5 inches (750 gallons) of water from the accumulator. 3 

### The water is blown down through a pipe that is connected to the bottom of the accumulator and discharged overboard approximately 18 to 24 inches below the waterline through a seachest. 1



### Blowdowns also can be performed using a steam blowdown valve that is connected at the top of the accumulator. This valve can also be used to control the water level in the accumulator; however, its primary function is to reduce the pressure in the accumulator to atmospheric pressure prior to emptying the accumulator. Wet accumulators are emptied before major maintenance or if an aircraft carrier will be in port for 72 hours or longer. 2,4 

### To empty the wet accumulator, multiple blowdowns are performed over an extended period of time (up to 12 hours) to slowly reduce pressure and to minimize noise.

### Catapult Wet Accumulator Discharges 3 2.2 Releases t o the Environment
Aircraft carrier catapult wet accumulators are initially charged with boiler or steam generator feedwater and fed with steam from the steam plant as the catapult is operated. The feedwater is treated with chemicals at specified rates to prevent scaling and corrosion, including oxygen scavengers and chelating agents. Unlike boilers, wet accumulators are unfired pressure vessels and scale and corrosion are not significant problems. Therefore, the treatment chemicals in the initial charge of boiler feedwater are expected to be unreacted and discharged from the wet accumulator during flight operations and blowdowns. 5,6,7,8 

### With each blowdown, the concentration of feed chemicals is reduced in the accumulator, and the concentration in the accumulator tank approaches that of steam condensate.
Some of the steam supplied to the accumulator is used directly to drive the catapult, while some condenses to distilled water, diluting the initial charge of boiler feedwater in the wet accumulator. The steam supplied to the wet accumulator is pure water with very minor amounts of constituents derived from the materials of construction of the steam generating and handling systems (e.g., copper nickel piping). In addition, there may be small amounts of water treatment chemicals. The constituents are expected to be similar to those found in steam condensate based on process knowledge of similarities in the materials of construction. The amounts of these constituents in steam directed to the wet accumulator are expected to be less than the amounts contained in steam condensate discharge because steam condensate discharge is produced from steam that has longer contact times with piping and equipment of the shore steam system. For the purposes of this NOD report, condensed wet accumulator steam was considered similar to steam condensate. Steam condensate is a separate UNDS discharge and is described in detail in the Steam Condensate NOD report.

2.3 Vessels Producing the Discharge
Only the Navy’s aircr aft carriers produce this discharge. There are 12 aircraft carriers in the Navy, one of which is homeported in Japan. All of the remaining 11 aircraft carriers are homeported in the United States.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Wet accumulator blowdowns occur as a result of flight operations and catapult testing. Blowdowns resulting from flight operations occur outside 12 nautical miles (n.m.). Blowdowns resulting from catapult tests occur within 12 n.m.

### Catapult Wet Accumulator Discharges 4 Wet accumulators are emptied before major maintenance or when a ship will be in port for greater than 72 hours. In both cases, aircraft carriers empty the accumulator outside 12 n.m. when returning to port. However, after major maintenance has been performed on a wet accumulator or catapult, the wet accumulator is refilled and the entire catapult system tested in port. If the aircraft carrier will be in port for more than 72 hours after testing is complete, the accumulator will be emptied in port. 4



### 3.2 Rate
Before each test, the wet accumulator is filled with approximately 8,000 gallons of boiler or steam generator feedwater. Based on process knowledge, approximately 50 catapult shots are performed during each test. Wet accumulators are emptied before major maintenance of the catapult system or if an aircraft carrier will be in port for 72 hours or longer. After catapult testing, the wet accumulator is blown down or drained of the original 8,000 gallons of feedwater and approximately 1,100 gallons of condensed steam accumulated from the catapult shots. To empty the wet accumulator, multiple blowdowns are performed over an extended period of time (up to 12 hours) to reduce pressure slowly and minimize noise. A blowdown of 5 inches of water, which is equivalent to approximately 750 gallons of water, typically takes about 5 minutes to complete.

Each of the 11 aircraft carriers in the fleet has four wet accumula tors, which are tested as described above approximately once every 1.5 years. Thus, fleetwide, approximately 235,000 gallons of water are discharged within 12 n.m. each year from wet accumulators:

Similarly, approximately 33,000 gallons of condensed steam are discharged annually:

3.3 Constituents

The constituents in the feedwater that is used to fill a wet accumulator include disodium phosphate, ethylenediaminetetraacetic acid (EDTA), and hydrazine. None of these constituents are priority pollutants. Based on the analysis of steam condensate samples, the priority pollutants antimony, arsenic, benzidine, bis(2-ethylhexyl) phthalate, cadmium, copper, lead, nickel, selenium, thallium, and zinc can be present in the condensed steam in the wet accumulator. There are no known bioaccumulators in this discharge. Wet Accumulator Annual Blowdown Volume (gallons per year) = (Wet accumulator feedwater capacity) (4 accumulators per carrier) (11 carriers) / (Frequency of test) = (8,000 gallons/accumulator)(4

accumulators/carrier)(11 carriers) / (1.5 years) = 235,000 gallons per year

33,000 gallons/year = (1,125 gallons/accumulator)(4 accumulators/carrier)(11 carriers) / (1.5 years)

### Catapult Wet Accumulator Discharges 5 3.4 Concentrations

Table 1 shows the concentrations of the constituents identi fied in Section 3.3. The table is divided into two sections. The first section shows the concentrations of the pollutants detected in steam condensate. As explained in Section 2.2, the steam supplied to the wet accumulator is expected to contain lower concentrations of these constituents than measured in steam condensate samples. Nevertheless, to be conservative, the concentrations of these constituents in steam condensate were used to estimate the mass loadings from the condensed steam portion of wet accumulator discharge.
The second section of Table 1 shows specified concentrations of boiler feedwater treatment chemicals. As stated in section 2.2 and to be conservative, these chemicals were assumed to be discharged at these concentrations in the boiler feedwater portion of wet accumulator discharge.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality standards. In Section 4.3, the thermal effect of this discharge is discussed. In Section 4.4, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loading
Table 1 shows the estimated mass loadings of the constituents in wet accumulator discharge that were identified in Section 3.3. Fleet-wide annual mass loadings (in pounds/year) were estimated by multiplying the concentration of the constituents (in micrograms per liter ( μ g/L)) by the discharge rates from Section 3.2 (converted to liters per year) and the appropriate conversion factors using the following equation:

The annual volume for this discharge is a combination of the volume of steam condensed per year (33,000 gallons) and the volume of feedwater (235,000 gallons) charged into the wet accumulator.
As shown in Table 1, the amounts of priority pollutants discharged annually from the condensed steam portion of wet accumulator discharge are significantly less than one pound. Because the constituent concentrations used to calculate the mass loadings are actually from steam condensate discharge -- thought to overestimate pollutant concentrations in wet (log-normal mean conc. μ g/l)(g/1,000,000 μ g) (lbs/453.593 g) (annual volume l/yr)

≅ mass loading (lbs/yr)

### Catapult Wet Accumulator Discharges 6 accumulator steam -- the actual mass loadings in the condensed steam portion of wet accumulator discharge are probably lower. The annual, fleet-wide mass loadings of the boiler feedwater chemicals in wet accumulator discharge are estimated to be 195, 49, and 49 pounds for disodium phosphate, EDTA, and hydrazine, respectively.

4.2 Environmental Concentrations
Wet accumulator discharge is released directly to the environment. The estimated concentrations of the constituents in the discharge are shown in Table 1. The constituent concentrations for the condensed steam portion of the discharge shown in Table 1 are considered to be maximums for the reasons previously cited.
Based upon a comparison of the concentrations of all constituents in Table 1 to Federal and most stringent state water quality criteria (WQC), the concentrations of nitrogen (as ammonia, nitrate/nitrite, and total nitrogen), phosphorous, benzidine, bis(2-ethylhexyl) phthalate, copper, and nickel shown in Table 1 are discharged in excess of Federal and/or the most stringent state WQC. Table 2 shows the comparison of concentrations of those constituents that exceed WQC to their WQC.
The discharge will not significantly increase concentrations of pollutants near the ship. To empty the wet accumulator, multiple blowdowns are performed over an extended period of time (up to 12 hours) to reduce pressure slowly and minimize noise, so concentrations near the ship will be lower because the incremental discharges allow concentrations to dissipate.

4.3 Thermal Effects
The potential for catapult wet accumulator discharge to cause thermal environmental effects was evaluated by modeling the thermal plume using mixing conditions that would produce the largest plume and then comparing the thermal plume to state thermal discharge requirements. Thermal effects of catapult wet accumulator discharge were modeled using thermodynamic equations to estimate the plume size and temperature gradients in the receiving water body. 9 

### The model was run under conditions that would estimate the maximum plume size (e.g., minimal wind, slack water) for a wet accumulator on an aircraft carrier. The plume characteristics were compared to thermal mixing zone criteria for Virginia and Washington State. 9 

### Of the five states that have a substantial presence of Armed Forces vessels, only Virginia and Washington have established thermal mixing zone dimensions. Other coastal states require that thermal mixing zones be established on a case-by-case basis. Based upon this analysis, the discharge of a wet accumulator pierside does not cause thermal effects that exceed any known state criteria. 9



### 4.4 Potential for Introducing Non-Indigenous Species
Given that the water in wet accumulators is condensed steam at a temperature of 460 o 

### F, and the charging feedwater to the wet accumulators is distilled fresh water from the ship’s water generating plant, there is no potential for the transport of non-indigenous species.

### Catapult Wet Accumulator Discharges 7 5.0 CONCLUSION
Catapult wet accumulator discharge has a low potential to cause an adverse environmental effect because:

• Mass loadings of benzidine, bis(2-ethylhexyl) phthalate, nitrogen, phosphorous, copper, and nickel within 12 n.m. are small, less than a pound per year combined fleetwide, discharged at concentrations near WQC;

• The discharge contains small quantities of water treatment chemicals;

• Resulting contributions to environmental concentrations from the discharge are expected to be insignificant because the discharge event is spread out over multiple blowdowns that allow concentrations to dissipate; and

• The discharge of a wet accumulator pierside does not cause thermal effects that exceed known state thermal mixing zone criteria.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources were obtained. Process information and assumptions were used to estimate the rate of discharge. Based on this estimate and on concentration requirements of boiler feedwater chemistry, the concentrations of feedwater chemistry constituents resulting from this discharge were then estimated. Table 3 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes - Catapult Wet Accumulator Discharges, Round Two Meeting. March 14, 1997.

2. UNDS Equipment Expert Meeting Minutes - Catapult Wet Accu mulator Steam Blowdown. August 20, 1996.

3. Joe Hungerbuhler, NSWCCD-SSES 9223. Information on Catapult Wet Accumulator Blowdown. November 1, 1996. Clarkson Meredith, Versar, Inc.

4. Commander, Naval Air Force, U.S. Atlantic Fleet. Responses to TYCOM Questionnaire. M. Rosenblatt and Son, Inc. May 20, 1997.

5. Naval Ship Systems Engineering Station, Memorandum - Boiler Blowdown Discharges. August 23, 1991.

### Catapult Wet Accumulator Discharges 8 6. UNDS Equipment Expert Meeting Structured Questions - Nuclear Steam Generator Blowdown/Safety Valve Testing Effluents. NAVSEA 08U, August 16, 1996.

7. NSWC, Carderock Division, Memorandum - Chelant Boiler Feedwater Treatment Implementation. March 18, 1995.

8. Naval Ships’ Technical Manual (NSTM), Chapter 220, Volume 2, Revision 7, Sections 21 and 22. Boiler Water/Feed Water Test & Treatment. December 1995.

9. NAVSEA. Thermal Effects Screening of Discharges from Vessels of the Armed Services. Versar, Inc. July 3, 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by

### Catapult Wet Accumulator Discharges 9 The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Steve Opet, NAWCADLKE. Information on Average Number of Shots per Catapult. April 4, 1997. Clarkson Meredith, Versar, Inc.
UNDS Equipment Expert Meeting Minutes - Aircraft Launch Equipment and Recovery Equipment Discharge Meeting. August 22, 1996.
Jane's Information Group, Jane's Fighting Ships, Capt. Richard Sharpe, Ed. Sentinel House: Surrey, United Kingdom, 1996.
Patty's Industrial Hygiene and Toxicology, 3rd Edition, George D. and Florence E. Clayton, Ed. John Wiley & Sons: New York, 1981.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Catapult Wet Accumulator Discharges 10 Figure 1. Wet Accumulator Steam, Feed, and Blowdown Piping

### Catapult Wet Accumulator Discharges 11 Figure 2. Wet Accumulator Internal Steam Charging Manifold

### Catapult Wet Accumulator Discharges 12 Table 1. Estimated Catapult Wet Accumulator Discharge Constituents, Concentrations,

and Mass Loadings Based Upon Steam Condensate Sampling Data

Constituents Concentrations ( μ g/l)

Log Normal Concentration Rate of Wet Accumulator Fleet-Wide Mass

Loading From Steam Condensate 1 Mean 2 Range Discharge (l/yr) 3 (pounds/yr) Antimony Total 7.13 BDL - 26.8 125,000 2.0 x 10 -3 Arsenic Total 0.74 BDL - 2.3 125,000 2.0 x 10 -4 Cadmium Total 2.86 BDL - 6.1 125,000 7.9 x 10 -4 Copper Dissolved 13.4 BDL - 49.0 125,000 3.7 x 10 -3 Total 20.1 BDL - 91.0 125,000 5.5 x 10 -3 Lead Dissolved 3.58 BDL - 12.7 125,000 9.9 x 10 -4 Total 4.38 BDL - 18.9 125,000 1.2 x 10 -3 Nickel Dissolved 10.3 BDL - 22 125,000 2.8 x 10 -3 Total 11.6 BDL - 34.7 125,000 3.2 x 10 -3 Selenium Total 2.87 BDL - 3.5 125,000 7.9 x 10 -4 Thallium Dissolved 1.18 BDL - 13.3 125,000 3.3 x 10 -4
Zinc Dissolved 13.94 7.15 - 21.9 125,000 3.8 x 10 -3 Total 11.35 BDL - 23.0 125,000 3.1 x 10 -3 Ammonia as Nitrogen 180 120 - 370 125,000 4.9 x 10 -2 Nitrate/Nitrite 440 300 - 810 125,000 1.2 x 10 -1 Total Nitrogen 1240 NA 125,000 3.4 x 10 -1 Total Phosphorous 90 BDL - 270 125,000 2.5 x 10 -2 Benzidine 32.8 BDL - 73.5 125,000 9.0 x 10 -3 Bis(2-ethylhexyl) phthalate 19.4 BDL - 112 125,000 5.3 x 10 -3 From Boiler Feedwater Treatment Chemicals 4 Disodium phosphate 100,000 NA 888,000 196 Ethylenediaminetetraacetic acid (EDTA) 25,000 NA 888,000 49

Hydrazine 25,000 NA 888,000 49 The constituents listed above are those expected to be found in the wet accumulator discharge. BDL denotes below detection limit. 1. Constituents listed are the priority pollutants detected in steam condensate samples. 2. Highest of the dissolved and total log average values. 3. This value is the product of the annual wet accumulator discharge cited in section 3.2 and the conversion factor of 3.785 liters per gallon. 4. These concentrations are based on the specified rates of application of these constituents to boiler feedwater to inhibit scaling and corrosion. Log-normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., “non-detect” samples), estimated analyte concentrations equivalent to one-half of the detection levels were also used to calculate the log-normal mean. For example, if a “non-detect” sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the log-normal mean calculation.

### Catapult Wet Accumulator Discharges 13 Table 2. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Catapult Wet Accumulator Discharge

Constituent Log-Normal Mean

Concentration ( μ g/L) Federal Acute WQC ( μ g/L) Most Stringent State Acute WQC ( μ g/L) Ammonia as Nitrogen 180 None 6 (HI) A Nitrate/Nitrite 440 None 8 (HI) A Total Nitrogen 1240 None 200 (HI) A Total Phosphorous 90 None 25 (HI) A Benzidine 32.8 None 0.000535 (GA) Bis(2-Ethylhexyl) Phthalate 19.4 None 5.92 (GA)

Copper

1 Dissolved 13.4 2.4 2.4 (CT, MS) Total 20.1 2.9 2.5 (WA) Nickel 1 Total 11.6 74.6 8.3 (FL, GA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values.

1 Assumes the constituents and their concentrations in this discharge are similar in concentration to the constituents found in steam condensate that originates from shore facilities.

CT = Connecticut HI = Hawaii FL = Florida MS = Mississippi GA = Georgia WA = Washington



### Table 3. Data Sources

Data Sources NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X X 3.2 Rate X 3.3 Constituents X 4.1 Mass Loadings X 4.2 Environmental Concentrations X 4.3 Thermal Effects X4.4 Potential for Introducing NonIndigenous Species X

### Cathodic Protection 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including th e system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Cathodic Protection

### Cathodic Protection 2 2.0 DISCHARGE DESCRIPTION
This section describes the discharge associated with cathodic protection and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Nearly all vessels use some form of cathodic protection to prevent metal hulls and underwater structures from corroding. The Armed Forces (Navy, Air Force, Army, Military Sealift Command (MSC)) and the U.S. Coast Guard (USCG) use cathodic protection, in conjunction with corrosion-resistant coatings, to protect their vessels. This combination provides an optimal corrosion control system which utilizes the advantages of each individual system. While coatings are the primary means of controlling corrosion, nearly all coatings have some defects (whether from wear or damage) and some components are uncoated by design (e.g., propellers). Cathodic protection could, in theory, be used alone to protect a hull and other external underwater structures, but the number of anodes for sacrificial-anode-based systems or power requirements for Impressed Current Cathodic Protection (ICCP)-based systems would increase greatly. When used in conjunction with coatings, cathodic protection reduces the effects of wear and failure of the paint systems and reduces the associated required repairs and maintenance. Without cathodic protection systems, vessels would be subject to severe corrosion (i.e., dissolution and discharge of hull material) of the underwater hull and appendages resulting in either increased underwater repairs and maintenance or more frequent dry-docking of the vessels for renewal of underwater hull paint systems.
The two types of cathodic protection used by the Armed Forces -- sacrificial anodes and ICCP systems -- are illustrated schematically in Figure 1. Small boats and craft which have wood, aluminum, fiberglass or rubber (inflatable) hulls do not require cathodic protection to protect these materials from corrosion (but may have small anodes located near the propellers for their protection). Also, many of the small boats and craft with steel hulls that utilize sacrificial anodes are stored out of the water on trailers or blocks.

2.1.1 Sacrificial Anodes
When sacrificial anodes are used, the anodes are physically connected (e.g., by bolts or welding) to ship components and structures. As shown in Figure 2, an electrochemical cell is formed between the anode and the cathode (the structure to which the anode is connected) through the surrounding electrolyte (usually seawater). The anode is preferentially corroded or “sacrificed”, producing a flow of electrons to the cathode which results in a reduction or elimination of corrosion at the cathode. Large ships with mandatory dry-dock inspection and overhaul intervals of less than three years, as well as the most boats and small craft, use sacrificial anodes to protect the underwater hull. The numbers and sizes of the anodes are determined by the wetted surface area of the hull, the planned replacement cycle of the anodes, and the corrosion history of the vessel.

### Cathodic Protection 3 Sacrificial anodes continually corrode when immersed and require routine replacemen t to maintain sufficient mass and surface area for adequate cathodic protection. On average, zinc anodes are estimated to be completely consumed every six years. 1,2,3,4 

### The consumption rate depends on the service environment, the condition of the hull coating, and the location of the anode on the hull.
Zinc anodes are used almost exclusively by DoD and USCG vessels for sacrificial cathodic protection of hulls, 5 

### with aluminum anode usage limited to a few (less than 5) Navy submarines. Naval Sea Systems Command (NAVSEA) continues to evaluate aluminum anodes for use on other Navy ships and their use requires prior NAVSEA authorization and design review. 5



### Aluminum anodes have 3.4 times the current capacity i 

### of zinc anodes due primarily to differences in valence (3 for aluminum vice 2 for zinc) and density. 5 

### The lower density of aluminum anodes also results in aluminum anodes occupying more volume than zinc anodes of the same weight. Development of the military specification 6 

### for aluminum anodes has only recently been completed although commercial aluminum anodes have been available for many years. Aluminum anodes are not as readily available as zinc anodes and are more prone to passivate (become inactive) than zinc anodes, but may be considered for use where the benefits of increased current capacity and reduced weight offset the disadvantages of increased volume.
Sacrificial anodes used to prevent corrosion of heat exchangers, condensers, evaporators, sewage collection, holding and transfer tanks, ballast tanks, bilges, sea chests, sonar domes, or other non-hull areas or components are not addressed in this NOD report, but in NOD reports describing these discharges (e.g. Seawater Cooling Discharge and Clean Ballast).

2.1.2 ICCP Systems

The Armed Forces also use ICCP systems (see Figure 3) to protect hulls in lieu of sacrificial anodes. ICCP systems are employed when the wetted surface of the hull and other underwater components requiring cathodic protection is large or a controllable system is required. 5 

### ICCP systems protect against corrosion using direct current (DC) from a source within the ship in lieu of current provided by a sacrificial anode. Except for the source of current, the mechanism of protection is identical for sacrificial anode cathodic protection and ICCP (see Figure 1). The current is passed through platinum-plated tantalum anodes designed for a 20-year service life. A silver/silver chloride (Ag/AgCl) reference electrode (control reference cell) measures the electrical potential of the hull and is used to determine how much current is required from the ICCP system to provide adequate cathodic protection.

i Current capacity , a sacrificial anode material property, is the total current available per unit mass over the life of the anode, commonly expressed as (amp-hr/kg) or (amp-yr/lb). The current capacity for zinc and aluminum anodes is 812 amp-hr/kg and 2759 amp-hr/kg, respectively. Current capacity should not be confused with the maximum output current

of an anode, which is a function of the anode material, anode surface area, system resistance, and driving potential. For most common types of zinc anodes used on underwater hulls, the maximum output current is approximately 0.4 amps per anode. 5

### Cathodic Protection 4 2.2 Releases to the Environment

2.2.1 Sacrificial Anodes

As the zinc or aluminum anode is consumed (oxidized), ionized zinc or aluminum is released into the receiving waters. Water at the cathode (such as the steel hull) is reduced forming hydroxyl (OH - 

### ) ions which combine with the zinc or aluminum ions to form zinc or aluminum hydroxide if excess oxygen is present. Another possible reaction produces hydrogen at the cathode, especially in deaerated seawater.
In addition, oxidants (primarily chlorine and bromine) could also be produced in secondary reactions because of the electrical potential of the anode. Precise reactions and probabilities will vary with conditions in the seawater environment. However, the relatively low electrical potential of the sacrificial anode (-1.05 volts average) compared with ICCP systems (- 15volts Ag/ AgCl reference electrode) will result in less oxidant being formed. Those oxidants which are formed will rapidly react with the surface of the sacrificial anode to form zinc or aluminum chloride, or react with oxidant-demanding substances in the water. Due to the relatively low electrical potential of sacrificial anodes and the rapid reactive nature of the anode surface, the possible generation of oxidants by sacrificial anodes will not be considered further.

2.2.2 ICCP Systems
ICCP systems operate at higher electrical potentials than sacrificial anodes and consequently can generate more oxidants. Precise primary and secondary reactions of oxidants will vary with seawater conditions such as salinity, temperature, ammonia content, pH, etc., but will primarily consist of various chlorinated and brominated substances. These substances include: hypochlorous and hypobromous acids, hypochlorite and hypobromite, chloro- and bromo-organics, chloride, bromide, chloramines, and bromamines. These substances are commonly called Chlorine-Produced Oxidants (CPO) when associated with brackish or seawater. 7



### The general reactions related to CPO are initiated when chlorine (Cl 2 

### ) is generated by the reduction of chloride ions (Cl - 

### ) in seawater. The chlorine reacts to form hypochlorous acid (HOCl) and the hypochlorite ion (OCl - 

### ) in the water. These two compounds, along with the chlorine, are referred to as free chlorine. Free chlorine, the standard disinfection agent used in water treatment facilities, undergoes four important types of reactions in natural waters: (1) oxidation of reduced substances and subsequent conversion to chloride; (2) reaction with ammonia and organic amines to form chloramines, collectively called combined chlorine; (3) reaction with bromide to form hypobromous acid (HOBr) and hypobromite (OBr - 

### ), called free bromine; and (4) reaction with organics to form chloro-organics. Free bromine reacts in a manner similar to free chlorine, oxidizing reduced substances or forming bromamines (combined bromine) or bromo-organics. Most common analytical methods for quantifying CPO measure the sum of all free and combined chlorine and bromine in solution, but do not measure the chloro- and bromo-organics.

### Cathodic Protection 5 Human health issues are a concern for some of these chlorinated hydrocarbons, which are suspected carcinogens and pose a concern when found in significant quantities in drinking water. However, these small quantities of chloro- and bromo-organics are produced only in brackish or seawater. These materials are not generated by ICCP systems in freshwater ports due to the low concentrations of chlorides and bromides. Most drinking water is drawn from groundwater or freshwater sources. Armed Forces vessels that are homeported in seawater or brackish water ports are not docked near drinking water intakes. Given the limited quantity and the location of discharge, exposure to drinking water intakes is unlikely. These chlorinated hydrocarbons are not separately addressed further in this NOD report

.


### 2.3 Vessels Producing the Discharge

Table 1 s hows the vessels that produce this discharge. 1,8,9,10 

### The table identifies whether vessels use sacrificial anodes or ICCP systems. Boats and craft of the Navy, Naval Auxiliary, USCG, MSC, Army, and Air Force use sacrificial anodes for cathodic protection. Of the approximately 5000 miscellaneous small boats and craft, approximately 30% are expected to have steel hulls and therefore cathodic protection. The remaining 70% are assumed to have hulls constructed of fiberglass, wood, aluminum, or other non-ferrous materials which do not require cathodic protection.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Discharge from cathodic protec tion systems associated with a vessel’s hull occurs continuously whenever the vessel is waterborne. This discharge occurs both within and beyond 12 nautical miles (n.m.).

3.2 Rate

3.2.1 Sacrificial Anodes
The discharge from sacrificial anodes is cha racterized by a mass flux instead of a volumetric flow rate because the “constituents” enter the receiving water directly (via corrosion and dissolution). The following factors were used to calculate the average mass flux (also called corrosion/dissolution) of sacrificial anodes while pierside and underway:

1. Based on underwater hull inspections and maintenance records one-half of an

### Cathodic Protection 6 anode is consumed after three years. 4



### 2. The corrosion/dissolution rate while underway is approximately three- to fivetimes the pierside rate based on field studies. 3,11 

### A factor of four is used for calculations. Probable explanations for this phenomenon are: (1) the fully aerated seawater produced by a moving hull increases reaction rates; and (2) more corrosion products and other deposits and surface films are removed due to the erosion forces of the seawater.

3. Based on the actual vessel movement data available, the average Navy vessel spends approximately 176 days in port (pierside) and transits to or from port (underway) approximately 11 times each year. 12 

### The average MSC vessel spends approximately 94 days in port and performs approximately six transits. Vessel movement estimates for the Air Force, Army, and USCG vessels were made based on operational knowledge (see Table 2). The vessel movement data for the Navy was used in dissolution calculations since it results in the highest period of time that vessels are in port.
Using the above factors, the corrosion/dissolution rates were calculated for zinc anode s as shown in Calculation Sheet 1. At pierside, the rate was calculated to be 7.4 x 10 -6 

### (lb zinc/lb anode)/hr, and underway, it was 3.0 x 10 -5 

### (lb zinc/lb anode)/hr. These rates can also be expressed as a function of wetted hull area using a conversion factor based on information presented in Table 2 which lists the vessels incorporating sacrificial anode cathodic protection. This relationship is stated as follows:

Average density of zinc anodes = (total amount of anodes) / (total wetted surface area)

= (1,860,000 lb) / ( 10,826,000 ft 2 

### ) = 0.17 lb/ft 2



### This results in average pierside and underway zinc generation rates of 1.3 x 10 -6 

### and 5.1 x 10 -6 

### (lb zinc/square foot of underwater surface area)/hr.
Shipboard experience with aluminum anodes is limited, but as with zinc anodes the corrosion/dissolution rate of the anode is primarily determined by factors such as the area of bare metal requiring protection. Rates for aluminum anodes can therefore be calculated based on process knowledge and the previously calculated generation rates for zinc anodes. Using the ratio of current capacity of aluminum to zinc anodes, generation rates for aluminum anodes are 2.2 x 10 -6 

### ( lb aluminum/ lb anode)/hr pierside, and 8.8 x 10 -6 

### ( lb aluminum/ lb anode)/hr underway.

Current capacity ratio = (aluminum anode current capacity) / (zinc anode current capacity)

= (2759 amp-hr/kg) / (812 amp-hr/kg) = 3.4

### Cathodic Protection 7 3.2.2 ICCP Systems
Oxidant discharges from operating ICCP systems are also characterized by mass flux instead of flow rate because the constituents are created from the surrounding water due to electrolysis. Precise reactions and probabilities depend on a variety of conditions as described in Section 2.2.2.

In order to estimate the rate that CPOs are form ed from ICCP systems, a sample of ICCP system logs was reviewed and the average current output for Navy vessels in port was found to be approximately 35 amperes (amps). 13 

### Using the assumption that 100% of ICCP system current goes into producing chlorine, an hourly pierside chlorine generation rate of 46.3 grams (g) per vessel was calculated using Faraday’s Law:

(35 amps) (1 coulomb/amp-sec) (3,600 sec/hr) (35.45 g chlorine/mole) (mole/96,484 coulomb)

= 46.3 g chlorine/hr

Since ICCP systems are desig ned (i.e., anode design and system operating voltage) to maximize cathodic protection provided to the hull, and generation of chlorine or CPO is a secondary reaction, actual CPO generation rates are expected to be significantly lower.

ICCP anode deterio ration rates have been measured at 4.4 to 6.1 milligrams/ampere per year by the manufacturer. 14 

### For a vessel operating an ICCP system at 35 amps in port for 176 days per year, the resulting dissolution rate of platinum using 6.1 milligrams/ampere per year is:

(6.1 mg/amp-year) (35 amps/ship) = 214 mg/(ship-year)

3.3 Constituents

3.3.1 Sacrificial Anodes
Zinc anodes are approximately 99.3% zinc and contain small amounts of cadmium and aluminum (for activation). 15 

### Table 3a lists the chemical composition of zinc anodes according to military specifications. 15 

### Zinc and cadmium are priority pollutants. None of the materials in zinc anodes are bioaccumulators.
Aluminum anodes are approximately 95% aluminum, 5% zinc, and contain small amounts of silicon and indium (for activation). 6 

### Table 3b lists the chemical composition of aluminum anodes according to military specifications. 6 

### Zinc is a priority pollutant in aluminum anodes. Aluminum anodes could possibly contain up to 0.001% mercury as an impurity; mercury is a known bioaccumulator.

### Cathodic Protection 8 3.3.2 ICCP Systems
The deterioration of ICCP anodes (see Section 3.2.2) produces 214 mg/yr per ship of platinum. ICCP systems also produce by-products (oxidants) when they operate. In addition to the reduction reactions at the hull, ICCP systems can also produce chlorine, bromine and other oxidants (CPO) through secondary reactions at the anode because of the electrical potential (voltage) of the anode (see Section 2.2). These constituents are the primary concern for the ICCP portion of this discharge. Chlorine or CPOs are neither priority pollutants nor bioaccumulators, though EPA has developed water quality criteria for chlorine/CPO.

3.4 Concentrations
The discharge due to cathodic protection is a mass flux rather than a flow. The resultant concentration of constituents in the environment are discussed in Section 4.2.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings

4.1.1 Sacrificial Anodes

The number of sacrificial anodes installed on a vessel is related to the area of wetted surface needing protection and the area that is available for placing the anodes. The discharge from sacrificial anodes is therefore proportional to vessel size (except for submarines because the anodes only protect the propeller and stern appendages and not the hull). The amount of anodes installed is based on:

1. One 23-pound zinc anode per 115 ft 2 

### of total wetted area for large vessels (with more than 3,000 ft 2 

### of wetted area). 3,5



### 2. One 23-pound anode per 400 ft 2 

### of total wetted area for smaller vessels, boats, and craft. 3



### 3. 2,024 pounds (88 anodes) of zinc anodes per submarine. 3



### Using the large vessel criteria for all vessels with over 3,000 ft 2 

### of wetted surface is a conservative assumption because this criteria was written for large, high value vessels that have long periods between drydockings (and thus, less opportunity for anode replacement). Vessels

### Cathodic Protection 9 with wetted surface areas between 3,000 ft 2 

### and 10,000 ft 2 

### are drydocked more frequently, increasing the opportunity for repainting and anode replacement, and therefore could use fewer zinc anodes than the large vessel criteria. If the actual wetted surface area of a vessel was unavailable, it was approximated using a formula in the Naval Ships’ Technical Manual (NSTM), Chapter 633: 5



### S = 1.7 (l) (d) + (V ) / (d)

where S = wetted surface area of the hull and appendages, in square feet

l = length between perpendiculars, in feet d = molded mean draft at full displacement, in feet V = molded volume of displacement in cubic feet

Where availabl e, data on actual vessel movements were used to determine the number of days in port, number of transits, and days underway operating within 12 n.m. for Navy, MSC, USCG, and Army vessels. Where actual vessel movement data were not available, movement data for vessels with similar missions were used. This information is shown in Table 2 and Table 4. Using these data, the numbers of anodes installed on vessels, and anode corrosion/dissolution rates, the mass flow rate of this discharge was calculated. ii 

### When vessels are in port, the pierside dissolution rate is used to calculate the constituent mass flow rate. When vessels are operating within 12 n.m. of shore, the applicable dissolution rate is derived by summing 66.7% of the pierside dissolution rate and 33.3% of the underway dissolution rate. This applicable dissolution rate is then used to calculate the constituent mass flow rate. Total constituent-specific mass flow rates are calculated by summing the pierside constituent mass flow rate and the constituent mass flow rate when the vessel is operating within 12 n.m. An example of the calculation for determining total constituent-specific mass loading is provided below.

(305 days in port/ yr) (24 hrs/day) (417 lb anode/class) (7.4x10 -6 

### lb zinc/ lb anode/hr) + (60 days operating within 12 n.m./ yr) (24 hrs/day) (417 lb anode/class) [(0.667) (7.4x10 -6 

### lb zinc/ lb anode/hr) + (0.333) (3.0x10 -5 

### lb zinc/ lb anode/hr)] = (22.59 lb zinc/ yr/class) + (8.96 lb zinc/ yr/class) = 31.55 lb zinc/ yr/class

For the 89 sub marines in the Navy fleet that use sacrificial anodes, the total estimated annual loading of zinc within 12 n.m. is 6,360 pounds. Zinc anodes on submarines are required to protect propellers and stern appendages, which are similar in surface area for all submarine classes. Fifty-six of the Fleet’s 89 submarines are Los Angeles Class submarines. A Los Angeles Class submarine has eighty-eight 23-pound zinc anodes (2,024 pounds total) to protect propellers and stern appendages. 3 

### The number of anodes on a Los Angeles Class submarine (88) was used for all submarine classes because the surface areas of the propellers and stern appendages are similar among submarine classes.

ii Most DOD vessels will be at anchor or otherwise stationary 2/3 of the time and conducting transits or otherwise moving 1/3 of the the time when operating within 12 n.m. of shore. For mass loading calculation purposes, a combination of the pierside and underway dissolution rates was used, weighted 66.7% and 33.3% respectively. These percentages are based on fleet provided information.

### Cathodic Protection 10 For surface vessels, an estimated 113,201 pounds of zinc is discharged annually withi n 12 n.m. The wetted surface areas and total amount of anodes used to calculate the zinc discharged by vessels within 12 n.m. are presented in Table 2. The estimated mass loading was based on 1,805 surface vessels with a total wetted surface area of approximately 11 million square feet.
Mass loading for the approximately 5,000 small boats and craft of the Armed Forces was estimated using the following information:

1. 30% have steel hulls, and therefore sacrificial anodes (the remaining have wood, fiberglass, or aluminum hulls which do not require cathodic protection);

2. The average wetted surface area is 1,000 ft 2 

### (the approximate wetted surface area of a 65 ft tug boat), which is protected by approximately 58 pounds of zinc anodes (23 pounds per 400 square feet); iii



### 3. Each vessel spends 100% of the time in the water (a conservative estimate since many spend considerable time out of the water on trailers or blocks);
The resulting zinc discharged was then calculated using the static dissolution rate

. (5,000 vessels) (30%) (58 lb anodes/vessel) (100%) (7.4 x 10 -6 

### lb zinc/lb anode/hr) (365 days/yr) (24 hr/day) = 5,640 lb zinc/yr

Based on conservative assumptions, this calculation presents the maximum magnitude of the discharge from small boats and craft, which represents approximately only 5% of the previously estimated total annual discharge of 119,561 pounds of zinc (surface ships and submarines combined) for a maximum combined total of 125,201 pounds of zinc per year. This discharge could contain up to 626 pounds per year of aluminum and up to 88 pounds per year of cadmium, based on the potential concentration of minor constituents in zinc anodes.
Aluminum anodes are currently used on no more than 5 submarines. 16 

### Using the information in Table 4, each submarine with zinc anodes discharges approximately 71.5 pounds zinc/year within 12 n.m. This zinc loading was scaled for aluminum anodes using the current capacity ratio derived in Section 3.2.1 and the maximum number of vessels with aluminum anodes, resulting in a total fleetwide annual consumption (discharge) of 105 pounds of aluminum anodes as shown below.

iii Small boats and craft are non-standard vessels with wetted surface areas ranging from under one hundred square feet to one thousand square feet. Because adequate information is not available to characterize the surface area of specific small boats and craft, the upper bound of this range, one thousand square feet, is used as a conservative estimate of the average wetted surface area.

### Cathodic Protection 11 (71.5 lb zinc anode/submarine) / (3.4) = 21.0 lb aluminum anode/submarine (21.0 lb aluminum anode/submarine) (5 submarines) = 105 lb aluminum anodes consumed, fleetwide

Based on the composition of aluminum anodes, this discharge is comprised of 100 pounds aluminum, 5 pounds zinc, and could contain up to 0.21 pound per year of silicon and 0.02 pound per year of indium. The maximum potential loading of mercury from aluminum anodes was estimated to be 0.001 pound fleetwide, assuming that all aluminum anodes contain the highest allowable amount of mercury.

4.1.2 ICCP Systems
The mass loading due to deterioration of ICCP anodes was cal culated using the previously discussed anode deterioration rate and the number of vessels with ICCP systems. For the 267 vessels with ICCP systems, this results in a total fleet-wide platinum loading of:

(214 mg/yr) (273 vessels) = 57,138 mg/yr = 57 g/y r ≅ 2 ounces/yr

Annual CPO loadings were calculated using the estimated CPO generation rate of 46.3 g/hr per vessel (see Section 3.2). This rate was applied to the 273 vessels with ICCP systems (see Table 1) and time spent in port for each class to calculate the mass loadings presented in Table 5. The estimated annual loading of CPO based on the 273 vessels with ICCP systems is 98,000 pounds.

4.2 Environmental Concentrations
Two approaches were used to estimate the concentration of zinc and CPO in receiving waters from cathodic protection systems. The first uses a simplified dilution model, based on tidal flow in three major Armed Forces ports and is hereafter referred to as the “tidal prism” approach. The second approach was based on a mixing zone proximate to the hull of a typical Navy vessel. Each approach used the hourly zinc corrosion/dissolution rates and CPO production rate developed in Section 3.2 (i.e., for zinc: a pierside rate of 1.3 x 10 -6 

### (lb zinc/ft 2 

### )/hr and an underway rate of 5.1 x 10 -6 

### (lb zinc/ft 2 

### )/hr, and for CPO: 46.3 (g/vessel)/hr).

Tidal Prism. The tidal prism approach uses the mass of the constituent generated by vessels and mixes this mass with a volume of water. The mass is calculated by determining the number of vessels in a particular homeport, the type of cathodic protection system utilized, and the number of hours each vessel spends in port (both pierside and in transit) along with the aforementioned zinc and CPO generation rates. Together, these factors are used to calculate an annual loading to the harbor. The water volume used is the sum of all outgoing tides over a year times the surface area of the harbor. The sum of outgoing tides is called the “annual tidal excursion” which is defined as the difference between mean high water and mean low water over the course of a year. Annual tidal excursion data is readily available from the National Oceanographic and Atmospheric Agency (NOAA), and the 1996 data 17 

### was used for these calculations.

### Cathodic Protection 12 The tidal prism model assumes steady-state conditions, where zinc and CPO are completely mixed with the harbor water and are removed solely by discharge from the port during ebb tides. The outgoing tidal volumes are assumed to be carried away by long-shore currents (i.e., those moving parallel to shore) and do not re-enter the harbor. The tidal prism model also does not assume removal or concentration by other factors such as river flow, precipitation, evaporation, sediment exchange, or natural decay. By not accounting for removal or dilution due to river flow, precipitation, sediment exchange, and natural decay, the calculations result in a higher constituent concentration. The effect of evaporation could be to increase concentration due to water loss, or the effect could be neutral since water loss by evaporation is replaced by (additional) water inflow from the sea. While the model assumes complete mixing, there will be areas in the harbors with higher concentrations, primarily near the source vessels, along with areas of lower concentration.
The three ports that are used for the tidal prism model shown in Tables 6a, 6b, and 6c include Mayport, FL, San Diego, CA, and Pearl Harbor, HI. These ports were selected because they have minimal river inflow, small but well-defined harbor areas, and a high number of vessels of the armed forces. Each of these factors will tend to overestimate concentrations of zinc and CPO, either due to less volume of water or high numbers of potential sources. Other major ports, such as Norfolk (VA) and Bremerton (WA), were considered, but not included because of large river effects and very large harbor areas. The 1996 annual tidal volumes (annual tidal excursion times the harbor surface area) for the three ports (calculations provided in Calculation Sheet 2) are shown below:

• San Diego, CA: 3.77 x 10 13 

### liters;

• Mayport, FL: 6.67 x 10 11 

### liters; and

• Pearl Harbor HI: 3.41 x 10 12 

### liters.
Mixing Zone: For the mixing zone approach, the previously calculated zinc and CPO generation rates were used for each discharge, but the resultant environmental concentrations were calculated based on various volumes of water around a typical Armed Forces vessel (i.e., a “mixing zone”) instead of the entire port, as above. A vessel with 19,850 ft 2 

### of wetted surface area (i.e., a FFG 7 Class frigate size vessel) was selected for modeling the environmental concentration from sacrificial anodes since precise information was available for the number of zinc anodes installed on that ship class. A vessel with 37,840 ft 2 

### of wetted surface area (i.e., a CG 47 Class cruiser size vessel) was selected for modeling ICCP system discharges because of the large number of vessels in this ship class and it’s hull size is typical of most vessels with ICCP systems.

The model assumes the hull to be a half immersed cylinder (see Calculation Sheets 3 and 4). The zinc and CPO generation rates were then applied to various sizes of mixing zones (volumes of water surrounding the vessel), ranging from 0.1 to 100 feet from the hull, and mixing rates (the time required for the mixing zone contents to be exchanged with a new volume of clean seawater), ranging from 0.1 to 1 hour, to calculate resultant incremental zinc and CPO concentration increases shown in Table 7. The maximum time of exchange of 1 hour

### Cathodic Protection 13 corresponds to a realistic duration of slack tide, and is also the time required for a volume of water flowing at 0.1 knots to flow past a 600 foot long vessel longitudinally. Actual exchange times will usually be much less. For example, water flowing at 2 knots (typical for tidal flow) past the same 600 foot long vessel results in a time of exchange of 3 minutes.

4.2.1 Sacrificial Anodes
The in-port (static) and transient (dynamic) zinc corrosion/dissolution rates of 7.4 x 10 -6 

### and 3.0 x 10 -5 

### pounds of zinc per pound of anode per hour, respectively, (see Calculation Sheet 1) were used for the tidal prism model. Only the static rate was used for the mixing zone model since the highest potential concentrations would occur while the vessel is pierside.
Tidal prism. Based on the number and types of ships located in each of the three harbors 18 

### and the type of cathodic protection, the numbers of sacrificial anodes installed on each of the vessels in each ship class were estimated, based on the information in Section 3.2.1. The number and types of vessels using zinc sacrificial anodes at each port are listed in Table 6a. Using the annual zinc loadings and annual tidal excursion volumes, the average zinc concentrations caused by these vessels were calculated for each port (also shown in Table 6a). The average zinc concentration estimated by the tidal prism model and the ambient zinc concentrations 19 

### are summarized below.

Port Ambient Zinc from Anodes

• San Diego, CA: 11.3 μ g/L 0.09 μ g/L

• Mayport, FL: 5.0 μ g/L 1.35 μ g/L

• Pearl Harbor, HI: 12.8 μ g/L 0.31 μ g/L
As shown above, the contribution of zinc from sacrificial anodes makes up only a small portion of the ambient concentration, except for Mayport, where almost 30 percent of the ambient concentration can be attributed to the dissolution of zinc anodes. In each case, the ambient concentrations are well below the Federal and most stringent state water quality criteria (between 76 and 85 μ g/L) as shown in Table 8. Resultant incremental concentration increases of minor constituents (aluminum and cadmium) are shown in Table 6a and are at least 40,000 times lower than the most stringent Federal or state WQC.
A similar tidal prism analysis can be performed for aluminum anode usag e on submarines. Assuming that Pearl Harbor and San Diego each have the maximum five submarines with aluminum anodes, Table 6b shows the concentrations resulting from aluminum sacrificial anodes to be 0.02 μg/L of aluminum and 2x10 -7 

### μg/L of mercury for Pearl Harbor, and much less for San Diego. These concentrations are significantly less than the most stringent state WQC of 1,500 μg/L of aluminum (FL) and 0.025 μg/L of mercury (CT, FL, WA, and VA). Incremental concentration increases for other minor constituents (zinc, silicon, and indium) are also shown in Table 6b and are nearly 1,000,000 times lower than the most stringent Federal or state WQC.

### Cathodic Protection 14 Mixing zone. The mixing zone model calculated zinc concentrations within “envelopes” or mixing zones of uniform size and shape around a vessel’s hull, assuming various exchange rates. For calculation purposes, the mixing zones ranged from 0.1 foot to 100 feet from the hull, and the exchange rates ranged from 0.1 hour to 1 hour. Actual exchange rates are rarely more than one hour as discussed previously. Tabulated mixing zone calculations are presented in Table 7 and do not include ambient concentrations of zinc in the water. Ambient zinc concentrations for each port were then added to the mixing zone concentrations and compared to ambient WQC.

Federal and state WQC exist for zinc (see Table 8). The Federal WQC is 81 μ g/L for chronic exposure. Washington state’s WQC of 76.6 μ g/L for chronic exposure is the most stringent state criteria. 19 

### For exchange rates of one hour or less, any mixing zone of six inches or more results in zinc concentrations (including the contribution of zinc from ambient water in each port) less than the most stringent state WQC of 76.6 μ g/L for chronic exposure. Ambient zinc concentrations for Mayport, FL and Pearl Harbor, HI were obtained from EPA’s STORET system. The Navy had more recent data on San Diego Bay and used this data rather than the data from the STORET system. 9,19 

### These concentrations are assumed to include any contributions of zinc from sacrificial anodes.
The results of the mixing zone analysis developed for sacrificial zinc anodes (Table 7) can be scaled to provide similar results for aluminum anodes using the current capacity ratio (3.4) developed in Section 3.2.1 and the maximum allowable concentration of mercury (0.001%). The sample calculation below was performed for the scenario from Table 7 that would produce the highest estimated concentrations of aluminum and mercury (a time of exchange of one hour, and a mixing zone of 0.1 foot):
Zinc concentration at radius of 0.1 ft = 236 μg/L
Aluminum concentration at same radius: = (236 μg/L)/(3.4) = 69.4 μg/L
Maximum potential mercury concentration at same radius = (69.4 μg/L)/(100,000)

The estimated concentration for aluminum (69.4 μg/L) is twenty times less than the most stringent state chronic WQC of 1,500 μg/L (Fl), and there are no federal WQC for aluminum. The estimated concentration for mercury (0.0007 μg/L) is 35 times less than Federal and most stringent state chronic WQC (0.025 μg/L). Similar calculations can be performed for other minor constituents of sacrificial anodes. In all cases, the resultant concentration increase is at least 50 times less than the most stringent Federal and state WQC at a distance 0.1 feet from the hull.

4.2.2 ICCP Systems
This discharge consists of various chlorinated and brominated substances (CPOs). As discussed in Section 3.2.2, these generation rates assume that 100% of the current passed by the

### Cathodic Protection 15 ICCP system creates CPOs, while in actuality, the current also produces metal complexes, oxygen, hydrogen, and other compounds in addition to CPOs with each collateral reaction consuming a portion of the total current. Seawater conditions have a strong influence on the type and magnitude of secondary reactions at the hull and sacrificial anodes. Because seawater conditions vary with geographic location, the extent of secondary chemical reactions cannot be accurately predicted. Therefore, a conservative assumption that 100% of the current produces CPOs is used.
In order to estimate the amount of CPOs generated by ICCP systems, ships’ logs for a variety of vessels were reviewed to determine the average current produced by ICCP systems in port (35 amps). 13 

### From this information and Faraday’s Law, an hourly, pierside CPO generation rate of 46.3 g/hr was calculated (see Section 3.2.2). This rate was used for both the tidal prism and the mixing zone models.
Tidal prism. Using the same approach as described in Section 4.2.1 and CPO generation rates, annual CPO loading due to the Armed Forces vessels in each of the three ports were calculated as shown in Table 6c. The chronic criteria and concentrations estimated from the tidal prism model are summarized below:

Port Criteria CPO from ICCP

• San Diego, CA: N/A* 0.17 μ g/L

• Mayport, FL: 10.0 μ g/L 3.43 μ g/L

• Pearl Harbor, HI: 7.5 μ g/L 0.75 μ g/L
* San Diego discharge limits are set on a case-by-case basis
This model assumes complete mixing and does not consider any decay or secondary reactions. However, CPO is known to rapidly decay in seawater. In the first stage of CPO decay, a portion of the CPO disappears within one minute, consumed by the instantaneous oxidant demand. The rate of this first-stage reaction is related to temperature. One study, for example, found that the percentage of CPO that disappeared within one minute varied from 4% at 0 °C to 20 

### Other factors that influence the initial rate of decay include ammonia concentration and the nature of the oxidant demand. In the second stage of CPO decay, the CPO remaining after the first stage is reduced more slowly. Second stage decay half-lives of between 1 and 100 minutes have been observed. 20 

### In most cases, however, the majority of CPO will disappear within an hour of being added to seawater. 20,21



### If these decay rates were incorporated into the tidal prism model, the average CPO concentrations shown above for the three ports would be lower. For example, the average CPO concentration of 3.43 μ g/L in Mayport, FL was calculated assuming zero CPO decay for the duration of a tidal excursion. Using average decay estimates (i.e., 25% first stage decay after one minute, 50% second stage decay per hour) provides a 98.8% reduction in CPO for the 12 hour duration of a tidal excursion, resulting in CPO concentrations orders of magnitude below WQC.

### Cathodic Protection 16 Mixing zone. Using the mixing zone approach described for sacrificial anodes, CPO concentrations within “envelopes” or mixing zones around a vessel’s hull were calculated. For calculation purposes the mixing zones ranged from 0.1 foot to 100 feet from the hull, and the mixing rates ranged from 0.1 hour to 1 hour. As stated previously, actual exchange rates are rarely more than 1 hour, and may be as low as a few minutes.
Tabulated calculations of CPO mixing zone calculations are included in Table 7. For exchange rates of 1 hour or less, any mixing zone of 5.5 feet or more results in CPO concentrations below the most stringent state chronic WQC of 7.5 μ g/L. EPA’s STORET system does not contain monitoring data for chlorine; therefore, ambient conditions can not be determined.
As for the tidal prism model calculations, these figures assume no decay of CPO. Using the CPO decay rates discussed above, a 47.0% reduction in the CPO concentrations listed in Table 6b for a 1 hour mixing zone exchange rate would be expected. Applying this decay rate to the mixing zone model and assuming a time of exchange of one hour, any mixing zone with a radius of 3 feet or more results in CPO concentrations caused by ICCP systems less than the most stringent state chronic WQC of 7.5 μ g/L.

4.3 Potential for Introducing Non-Indigenous Species

T here is insignificant potential for transport of non-indigenous species by this discharge because no water is retained nor transported.

5.0 CONCLUSIONS

5.1 Sacrificial Anodes
Cathodic protection discharges from sacrificial anodes have a low potential for causing adverse environmental effects for the following reasons:

• the loadings from sacrificial zinc and aluminum anodes do not result in zinc or aluminum concentrations, or concentrations of minor constituents, above ambient water quality criteria in any of the harbors based on the results of the tidal prism model;

• zinc, aluminum, and mercury concentrations are below WQC within a distance of 0.5, 0.1, and 0.1 feet, respectively, during periods of slack water (little water movement in the harbor); and

• loadings of mercury are small (less than 0.001 pound per year fleetwide).
This conclusion is based on corrosion/dissolution rates estimated from the average anode replacement intervals for Navy vessels. The number of anodes per vessel class was based on actual numbers or, in lieu of such data, estimated using the vessel’s wetted surface area. This

### Cathodic Protection 17 approach was also applied to other Armed Forces vessels.

5.2 ICCP Systems
Cathodic protection discharges from Impressed Current Cathodic Protection (ICC P) systems have a low potential for causing adverse environmental effects for the following reasons:

• the loadings from ICCP systems do not result in CPO concentrations above ambient water quality criteria in any of the harbors based on the results of the tidal prism model; and

• CPO concentrations drop below WQC within a distance of 5.5 feet during periods of slack water without considering CPO decay (which would reduce concentrations even lower).
This conclusion is based on a review of ICCP system logs a nd the assumption that 100% of the current passed from the ICCP system anodes generates CPO.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Table 9 shows the sources of data used to develop this NOD report.
Specific References

1. Commander, Submarine Force, U.S. Atlantic Fleet (Ser N451A/4270), UNDS Data Call Package Submission: Encl: 688 & 726 Class Submarine Discharge Data Packages. December 13, 1996.

2. Potential Impact of Environ mental and Worker Health Laws on the Sacrificial Anode Life Cycle. Ocean City Research Corp. June 1993.

3. M. Rosenblatt & Son, Inc., Zinc Anode Usage Guidance, April 23, 1997.

4. Commander, Naval Air Forces, U.S. Atlantic Fleet. Responses to TYCOM questionnaire. M. Rosenblatt & Son, Inc. May 20, 1997.

5. Naval Ships’ Technical Manual (NSTM) Chapter 633, Cathodic Protection. Sections 2.3.2 to 2.3.5, 4.2.1, 4.3.1, 4.4 to 4.4.2, and Tables 3 and 4. August 1992.

6. Military Specification MIL-A-24779 , Anodes, Sacrificial Aluminum Alloy, 1992

7. White, G.C., 1992, The Handbook of Chlorination and Alternative Disinfectants. Van Nostrand Reinhold, New York, p.1308.

### Cathodic Protection 18 8. UNDS Equipment Expert Meeting-Cathodic Protection, Sacrificial Anodes, Action Item No. 124. November 14, 1996.

9. UNDS Cathodic Protection Evaluation. The Marine Environmental Support Office, Naval Command, Control and Ocean Surveillance Center, San Diego, CA. February 13, 1997.

10. Dan Kailey, M. Rosenblatt & Son, Inc., Master UNDS Vessel List, Conrad Bernier, Malcolm Pirnie, Inc., April 23, 1997.

11. Seelinger, Andrew; Shimko, LCDR Michael J., Impressed Current Cathodic Protection and Physical Scale Modeling, CORROSION, CAUSES AND CONTROL Short Course, Naval Postgraduate School, Monterey, CA. June 1992.

12. Kailey, Dan, M. Rosenblatt & Son, Inc., Vessel Schedule Data, Clarkson Meredith, Versar, Inc., April 23, 1997.

13. M. Rosenblatt & Son, Inc., Summary of U.S. Navy Impressed Current Cathodic Protection (ICCP) System Output, June 16, 1997

14. Electocatalytic, Inc. Shipboard Impressed Current Anodes. February, 1992.

15. Military Specification MIL-A-18001, Anodes, Sacrificial Zinc Alloy. 1993.

16. Dunstan Mensah, SEA 91T131, September 30, 1997, Inquiry on Aluminum Anode Usage on Submarines, M. J. Shimko, M. Rosenblatt & Son, Inc.

17. The National Oceanic and Atmospheric Administration Homepage, www.olld.nos.noaa.gov/long__wl.html, 1997.

18. The United States Navy, List of Homeports, Effective April 30, 1997.

19. U.S. Env ironmental Protection Agency, Office of Wetlands, Oceans and Watersheds, Assessment and Watershed Protection Division, Retrieval from STORET Database. 1997.

20. Davis, M.H., and Coughlan, J., 1983. A Model for Predicting Chlorine Concentrations Within Marine Cooling Circuits and its Dissipation at Outfalls. In Jolley, R.L., Brunds, W.A., Cotruvo, J.A., Cumming, R.B., Mattice, J.S., and Jacobs, V.A. (eds.), Water Chlorination: Environmental Impact and Health Effects, Vol. 4, Book 1, Ann Arbor Science, p. 347-357.

21. NAVSEA. Chlorination Report, Malcolm Pirnie. July 14, 1997.

### Cathodic Protection 19 General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
UNDS Equipment Expert Meeting Minutes- Protection, Sacrificial Anodes. August 6, 1996.

### Cathodic Protection 20 Fontana, Mars G., Corrosion Engineering, Third Edition, McGraw Hill, Inc., New York, 1986.
Jones, Denny A., Principles and Prevention of Corrosion, Macmillan Publishing Company, New York, NY, 1992.
Uhlig, Herbert H. and Revie, R. Winston, Corrosion and Corrosion Control an Introduction to Corrosion Science and Engineering, Third Edition, John Wiley & Sons, New York, 1985.
Van der Leeden, et. al. The Water Encyclopedia, 2nd Ed. Lewis Publishers: Chelsae, Michigan, 1990.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.
Jane’s Information Group, Jane’s Fighting Ships. Capt. Richard Sharpe, Ed. Sentinel House: Surrey, United Kingdom, 1996.
General Specifications for Ships of the United States Navy (GENSPECS), Section 633, Cathodic Protection. 1995.
Ciscon, David, M. Rosenblatt & Son, Inc., Vessel Transit Time, May 1, 1997,. Clarkson Meredith, Versar, Inc., Soule, R.E., M. Rosenblatt & Son, Inc., Response to Inquiry on ICCP Systems, May 8, 1997, Lee Sesler, Versar, Inc.
Aivalotis, LT Joyce, U.S. Coast Guard, Inquiry on Cathodic Protection of USCG Vessels, May 27, 1997, Lee Sesler, Versar, Inc.
UNDS Shipcheck of U.S. Army Watercraft, Fort Eustis, VA, January 1998.
M. Rosenblatt & Son, Inc., Environmental Loading Due To Cathodic Protection, June 13, 1997.
Malcolm Pirnie, Inc., Estimate of Zinc Concentrations Contributed by Hull Mounted Sacrificial Anodes in Selected Naval Ports, June 2, 1997.
Bonner, Frederick A., Malcolm Pirnie, Inc. Written Correspondence on Chlorine Discharge from Freshwater Layup, Submarine Heat Exchangers. April 9, 1997.

### Table 1. Listing of Vessels, Navy, MSC, Army, and USCG using Cathodic Protection

Class Description Quantity of Vessels Cathodic Protection System Navy Combatants ATC River Raider Class Mini Armored Troop Carriers 20 Sacrificial Anodes AT Armored Troop Carriers 21 Sacrificial Anodes CM Landing Craft, Mechanized 151 Sacrificial Anodes CU Landing Craft, Utility 40 Sacrificial Anodes CV 59 Forrestal Class Aircraft Carrier 1 ICCP CVN 65 Enterprise Class Aircraft Carrier 1 ICCP CV 63 Kitty Hawk Class Aircraft Carrier 3 ICCP CVN 68 Nimitz Class Aircraft Carrier 7 ICCP CG 47 Ticonderoga Class Guided Missile Cruisers 27 ICCP CGN 38 Virginia Class Guided Missile Cruiser 1 ICCP CGN 36 California Class Guided Missile Cruiser 2 ICCP DDG 993 Kidd Class Guided Missile Destroyers 4 ICCP DDG 51 Arleigh Burke Class Guided Missile Destroyers 18 ICCP DD 963 Spruance Class Destroyers 31 ICCP FFG 7 Oliver Hazard Perry Guided Missile Frigates 1 ICCP FFG 7 Oliver Hazard Perry Guided Missile Frigates 42 Sacrificial Anodes LCC 19 Blue Ridge Class Amphibious Command Ships 2 ICCP LCM 3 Mechanized Landing Craft 2 Sacrificial Anodes LCM 6 Mechanized Landing Craft 60 Sacrificial Anodes LCM 8 Mechanized Landing Craft 100 Sacrificial Anodes LCU 1610 Utility Landing Craft (LCU 1600) 40 Sacrificial Anodes LHD 1 Wasp Class Amphibious Transport Docks 4 ICCP LHA 1 Tarawa Class Amphibious Assault Ships 5 ICCP LPD 4 Austin Class Amphibious Transport Docks 3 ICCP LPD 7 Amphibious Transport Docks 3 ICCP LPD 14 Amphibious Transport Docks 2 ICCP LPH 2 Iwo Jima Class Assault Ships 2 Sacrificial Anodes LSD 36 Anchorage Class Dock Landing Ships 5 Sacrificial Anodes LSD 41 Whidbey Island Class Dock Landing Ships 8 ICCP LSD 49 Harpers Ferry Dock Landing Ships 3 ICCP MCM 1 Avenger Class Mine Countermeasure Vessels 14 Sacrificial Anodes MHC 51 Osprey Class Coastal Minehunter Vessels 12 Sacrificial Anodes PB Mk III and Mk IV Patrol Boats 31 Sacrificial Anodes PBR Mk II River Patrol Boats 25 Sacrificial Anodes PC 1 Cyclone Class Coastal Defense Ships 13 ICCP SSBN 726 Ohio Class Ballistic Missle Submarine 17 Sacrificial Anodes SSN 637 Sturgeon Class Attack Submarine 13 Sacrificial Anodes SSN 688 Los Angeles Class Attack Submarine 56 Sacrificial Anodes SSN 671 Narwhal Class Submarines 1 Sacrificial Anodes SSN 640 Benjamin Franklin Class Submarines 2 Sacrificial Anodes

Navy Auxiliary AFDB 4 Large Auxiliary Floating Dry Dock 1 ICCP AFDB 8 Large Auxiliary Floating Dry Dock 1 ICCP AFDL 1 Small Auxiliary Floating Dry Docks 2 ICCP AFDM 14 Medium Auxiliary Floating Dry Dock 1 ICCP AFDM 3 Medium Auxiliary Floating Dry Docks 4 ICCP AGF 3 Raleigh Class Miscellaneous Flagship 1 Sacrificial Anodes

### Table 1. Listing of Vessels, Navy, MSC, Army, and USCG using Cathodic Protection

Class Description Quantity of Vessels Cathodic Protection System
AGF 11 Austin Class Miscellaneous Flagship 1 Sacrificial Anodes AGOR 21 Gyre Class Oceanographic Research Ships 1 Sacrificial Anodes AGOR 23 T.G. Thompson Class Oceanographic Research Ships 2 Sacrificial Anodes AO 177 Jumboised Cimarron Class Oilers 5 ICCP AOE 6 Supply Class Fast Combat Support Ships 3 ICCP AOE 1 Sacramento Class Fast Combat Support Ship 4 ICCP ARD 2 Auxiliary Repair Dry Docks 1 Sacrificial Anodes ARDM Medium Auxiliary Repair Dry Docks 3 ICCP ARS 50 Safeguard Class Savage Ships 4 ICCP AS 39 Emory S Land Class Submarine Tenders 3 Sacrificial Anodes AS 33 Simon Lake Class Submarine Tenders 1 Sacrificial Anodes TR Torpedo Retrievers 22 Sacrificial Anodes YC Open Lighters (nsp) 254 Sacrificial Anodes YD Floating Cranes (nsp) 63 Sacrificial Anodes YDT Diving Tenders 3 Sacrificial Anodes YFN Covered Lighters (nsp) 157 Sacrificial Anodes YFNB Large Covered Lighters (nsp) 11 Sacrificial Anodes YFNX Lighter - Special Purpose (nsp) 8 Sacrificial Anodes YFP Floating Power Barges (nsp) 2 Sacrificial Anodes YFRT Covered Lighters - Range Tender (self propelled) 2 Sacrificial Anodes YFU Harbor Utility Craft ( YFU 83 & 91 ) 2 Sacrificial Anodes YO 65 Fuel Oil Barges 3 Sacrificial Anodes YOG 5 Gasoline Barges 2 Sacrificial Anodes YOGN Gasoline Barges (nsp) 12 Sacrificial Anodes YON Fuel Oil Barges (nsp) 48 Sacrificial Anodes YOS Oil Storage Barges (nsp) 14 Sacrificial Anodes YP Patrol Craft ( YP 654 & 676 ) 28 Sacrificial Anodes YR Floating Workshops (nsp) 25 Sacrificial Anodes YRB Repair and Berthing Barges (nsp) 4 Sacrificial Anodes YRBM Repair, Berthing and Messing Barges (nsp) 39 Sacrificial Anodes YRR Radiological Repair Barges (nsp) 9 Sacrificial Anodes YRST Salvage Craft Tenders (nsp) 3 Sacrificial Anodes YSD 11 Seaplane Wrecking Derrick (self propelled) 1 Sacrificial Anodes YTB 752 Large Harbor Tug (self propelled) 1 Sacrificial Anodes YTB 756 Large Harbor Tugs (self propelled) 3 Sacrificial Anodes YTB 760 Large Harbor Tugs (self propelled) 68 Sacrificial Anodes YTL 422 Small Harbor Tug (self propelled) 1 Sacrificial Anodes YTT Torpedo Trials Craft 3 Sacrificial Anodes Miscellaneous Boats and Craft ~5,000 Sacrificial Anodes

Military Sealift Command (MSC) T-AE 26 Kilauea Class Ammunition Ships 5 ICCP T-AE 26 Kilauea Class Ammunition Ships 3 Sacrificial Anodes T-AFS 1 Mars Class Combat Stores Ships 6 ICCP T-AFS 1 Mars Class Combat Stores Ships 2 Sacrificial Anodes T-AG 194 Mission Class Navigation Research Ship 1 ICCP T-AG 194 Mission Class Navigation Research Ship 1 Sacrificial Anodes T-AGM 22 Compass Island Class Missle Instrumentation Ship 1 ICCP T-AGOS 1 Stalwart Class Ocean Surviellance Ship 5 Sacrificial Anodes

### Table 1. Listing of Vessels, Navy, MSC, Army, and USCG using Cathodic Protection

Class Description Quantity of Vessels Cathodic Protection System
T-AGOS 19 Victorius Class Ocean Surviellance Ship 4 Sacrificial Anodes T-AGS 26 Silas Bent and Wilkes Classes Surveying Ships 2 Sacrificial Anodes T-AGS 45 Waters Class Surveying Ships 1 ICCP T-AGS 51 John McDonnel Class Surveying Ships 2 ICCP T-AGS 60 Pathfinder Class Surveying Ships 4 ICCP T-AH 19 Mercy Class Hospital Ships 2 ICCP T-AKR 295 Maesrk Class Fast Sealift Ships 2 ICCP T-AKR 295 Maesrk Class Fast Sealift Ships 1 Sacrificial Anodes T-AKR 287 Algol Class Vehicle Cargo Ships 6 ICCP T-AKR 287 Algol Class Vehicle Cargo Ships 2 Sacrificial Anodes T-AO 187 Henry J Kaiser Class Oilers 13 ICCP T-ARC 7 Zeus Class Cable Repairing Ship 1 ICCP T-ATF 166 Powhatan Class Fleet Ocean Tugs 5 ICCP T-ATF 166 Powhatan Class Fleet Ocean Tugs 2 Sacrificial Anodes

U.S. Coast Guard WHEC 378 Hamilton and Hero Class High Endurance Cutters 12 Sacrificial Anodes WMEC 230 Storis Class Medium Endurance Cutters 1 Sacrificial Anodes WMEC 213 Diver Class Medium Endurance Cutters 1 Sacrificial Anodes WMEC 270 A Famous Class Medium Endurance Cutters 4 Sacrificial Anodes WMEC 270 B Famous Class Medium Endurance Cutters 9 Sacrificial Anodes WMEC 210 A Reliance Class Medium Endurance Cutters 5 Sacrificial Anodes WMEC 210 B Reliance Class Medium Endurance Cutters 11 Sacrificial Anodes WAGB 290 Mackinaw Class Icebreakers 1 Sacrificial Anodes WAGB 399 Polar Class Icebreakers 2 ICCP WTGB 140 Bay Class Icebreaking Tugs 9 Sacrificial Anodes WPB 110 A Island Class Patrol Craft 16 ICCP WPB 110 B Island Class Patrol Craft 21 ICCP WPB 110 C Island Class Patrol Craft 12 ICCP WPB 82 C Point Class Patrol Craft 28 Sacrificial Anodes WPB 82 D Point Class Patrol Craft 8 Sacrificial Anodes WLB 225 Juniper Class Seagoing Buoy Tenders 2 Sacrificial Anodes WLB 180 A Balsam Class Seagoing Buoy Tenders 8 Sacrificial Anodes WLB 180 B Balsam Class Seagoing Buoy Tenders 2 Sacrificial Anodes WLB 180 C Balsam Class Seagoing Buoy Tenders 13 Sacrificial Anodes WLM 551 Keeper Class Coastal Buoy Tenders 2 Sacrificial Anodes WLM 157 White Sumac Class Coastal Buoy Tenders 9 Sacrificial Anodes WLR 115 River Buoy Tenders 1 Sacrificial Anodes WLR 65 River Buoy Tenders 6 Sacrificial Anodes WLR75 River Buoy Tenders 13 Sacrificial Anodes WIX Eagle Class Sail Training Cutter 1 Sacrificial Anodes WLIC 160 Pamlico Class Inland Construction Tenders 4 Sacrificial Anodes WLIC 100 Cosmos Class Inland Construction Tenders 3 Sacrificial Anodes WLIC 115 Inland Construction Tender 1 Sacrificial Anodes WLIC 75 A Anvil Class Inland Construction Tenders 2 Sacrificial Anodes WLIC 75 B Inland Construction Tenders 3 Sacrificial Anodes WLIC 75 D Clamp Class Inland Construction Tenders 2 Sacrificial Anodes WLI 100 A Inland Buoy Tender 1 Sacrificial Anodes WLI 100 C Inland Buoy Tender 1 Sacrificial Anodes

### Table 1. Listing of Vessels, Navy, MSC, Army, and USCG using Cathodic Protection

Class Description Quantity of Vessels Cathodic Protection System
WLI 65303 Inland Buoy Tender 2 Sacrificial Anodes WLI 65400 Inland Buoy Tender 2 Sacrificial Anodes WYTL 65 A 65 ft. Class Harbor Tugs 3 Sacrificial Anodes WYTL 65 B 65 ft. Class Harbor Tugs 3 Sacrificial Anodes WYTL 65C 65 ft. Class Harbor Tugs 3 Sacrificial Anodes WYTL 65 D 65 ft. Class Harbor Tugs 2 Sacrificial Anodes

Army BCDK Coversion Kit, Barge, Deck Cargo, Deck Enclosure 3 Sacrificial Anodes BD Barges, Derrick 12 Sacrificial Anodes BK Barges, Deck Cargo (nsp) 2 Sacrificial Anodes BPL Pier, Barge Type, Self-Evaluating (nsp) 1 Sacrificial Anodes FMS Floating Machine Shops 3 Sacrificial Anodes J-Boat Picket Boats 6 Sacrificial Anodes LARC-LX Lighter Amphibious Resupply Cargo (formerly BARC) 23 Sacrificial Anodes LCM-8 Landing Craft Mechanized 104 Sacrificial Anodes LCU Landing Craft Utility 48 Sacrificial Anodes LSV Frank S. Besson Class Logistic Support Vessels 6 Sacrificial Anodes LT Inland and Coastal Tugs 19 Sacrificial Anodes LT Inland and Coastal Tugs 6 ICCP Q-Boat Picket Boat 1 Sacrificial Anodes ST Small Tugs 13 Sacrificial Anodes T-Boat Boat, Passenger and Cargo 1 Sacrificial Anodes

Total 2167

### Table 2. Vessels Estimated Annual Sacrificial Anode Cathodic Protection Discharges

Class Description Quantity of Vessels w/ Zincs Wetted Surface

Area per Vessel (sq ft) Wetted Surface

Area of Class (sq ft) Total

Amount of Anodes by Class (lbs) Days in

Port per Vessel Number of

Transits per Vessel (e) Days

Operating within 12

n.m. Zinc Discharged

within 12 n.m. (lbs)
Navy Combatants ATC River Raider Class Mini Armored Troop Carriers 20 362 7,244 417 a 305 b 0 60 32 AT Armored Troop Carriers 21 362 7,606 437 a 305 b 0 60 33 CM Landing Craft, Mechanized 151 4,275 645,525 129,105 a 305 b 0 60 9,798 CU Landing Craft, Utility 40 3,860 154,400 30,880 a 305 b 0 60 2,344 FFG 7 Oliver Hazard Perry Guided Missile Frigates 42 19,850 833,700 166,152 c 167 13 0 5,477 LCM 3 Mechanized Landing Craft 2 990 1,980 114 a 305 0 60 9 LCM 6 Mechanized Landing Craft 60 990 59,400 3,416 a 305 0 60 259 LCM 8 Mechanized Landing Craft 100 1,603 160,300 9,217 a 305 0 60 700 LCU 1610 Utility Landing Craft (LCU 1600) 40 3,915 156,600 31,320 d 200 6 0 1,165 LPH 2 Iwo Jima Class Assault Ships 2 49,945 99,890 19,964 c 186 11 0 716 LSD 36 Anchorage Class Dock Landing Ships 5 45,405 227,025 51,060 c 215 13 0 2,121 MCM 1 Avenger Class Mine Countermeasure Vessels 14 8,410 117,740 9,982 c 232 28 0 481 MHC 51 Osprey Class Coastal Minehunter Vessels 12 6,418 77,016 9,936 c 232 28 0 479 PB Mk III and Mk IV Patrol Boats 31 897 27,796 1,598 a 305 b 0 60 121 PBR Mk II River Patrol Boats 25 261 6,531 376 a 305 b 0 60 29

Navy Auxiliary AGF 3 Raleigh Class Miscellaneous Flagship 1 41,595 41,595 8,326 c 183 12 0 296 AGF 11 Austin Class Miscellaneous Flagship 1 51,830 51,830 8,326 c 183 12 0 296 AGOR 21 Gyre Class Research Ships 1 8,834 8,834 1,767 a 113 11 0 40 AGOR 23 Thom. G. Thompson Class Research Ships 2 13,960 27,920 5,584 a 113 11 0 127 ARD 2 Auxiliary Repair Dry Docks 1 46,994 46,994 5,405 c 305 b 60 0 372 AS 39 Emory S Land Class Submarine Tenders 3 59,630 178,890 41,400 c 293 6 0 2,228 AS 33 Simon Lake Class Submarine Tenders 1 59,630 59,630 13,800 c 229 6 0 585 TR Torpedo Retrievers 22 1,125 24,750 1,423 a 305 b 0 60 108 YC Open Lighters (nsp) 254 6,475 1,644,650 94,567 d 305 b 0 60 7,177 YD Floating Cranes (nsp) 63 12,875 811,125 162,225 d 305 b 0 60 12,312 YDT Diving Tenders 3 8,885 26,655 5,331 d 305 b 0 60 405 YFN Covered Lighters (nsp) 157 6,680 1,048,760 209,752 d 305 b 0 60 15,919 YFNB Large Covered Lighters (nsp) 11 15,955 175,505 35,101 d 305 b 0 60 2,664 YFNX Lighter - Special Purpose (nsp) 8 4,760 38,080 7,616 d 305 b 0 60 578 YFP Floating Power Barges (nsp) 2 15,590 31,180 6,236 d 305 b 0 60 473 YFRT Covered Lighters - Range Tender (self propelled) 2 5,490 10,980 2,196 d 305 b 0 60 167 YFU Harbor Utility Craft ( YFU 83 & 91) 2 3,915 7,830 1,566 d 305 b 0 60 119

### Table 2. Vessels Estimated Annual Sacrificial Anode Cathodic Protection Discharges

Class Description Quantity of Vessels w/ Zincs Wetted Surface

Area per Vessel (sq ft) Wetted Surface

Area of Class (sq ft) Total

Amount of Anodes by Class (lbs) Days in

Port per Vessel Number of

Transits per Vessel (e) Days

Operating within 12

n.m. Zinc Discharged

within 12 n.m. (lbs)

YO 65 Fuel Oil Barges 3 10,205 30,615 6,123 d 305 b 0 60 465 YOG 5 Gasoline Barges 2 10,205 20,410 4,082 d 305 b 0 60 310 YOGN Gasoline Barges (nsp) 12 8,512 102,144 20,429 a 305 b 0 60 1,550 YON Fuel Oil Barges (nsp) 48 8,512 408,576 81,715 a 305 b 0 60 6,202 YOS Oil Storage Barges (nsp) 14 8,512 119,168 23,834 a 305 b 0 60 1,809 YP Patrol Craft (YP 654 & 676) 28 2,074 58,070 3,339 d 305 b 0 60 253 YR Floating Workshops (nsp) 25 7,350 183,750 36,750 d 305 b 0 60 2,789 YRB Repair and Berthing Barges (nsp) 4 4,320 17,280 3,456 d 305 b 0 60 262 YRBM Repair, Berthing and Messing Barges (nsp) 39 10,180 397,020 79,404 d 305 b 0 60 6,026 YRR Radiological Repair Barges (nsp) 9 6,405 57,645 11,529 d 305 b 0 60 875 YRST Salvage Craft Tenders (nsp) 3 10,965 32,895 6,579 d 305 b 0 60 499 YSD 11 Seaplane Wrecking Derrick (self propelled) 1 3,845 3,845 769 d 305 b 0 60 58 YTB 752 Large Harbor Tug (self propelled) 1 3,170 3,170 634 d 305 b 0 60 48 YTB 756 Large Harbor Tugs (self propelled) 3 3,265 9,795 1,959 d 305 b 0 60 149 YTB 760 Large Harbor Tugs (self propelled) 68 3,265 222,020 44,404 d 305 b 0 60 3,370 YTL 422 Small Harbor Tug (self propelled) 1 1,015 1,015 58 d 305 b 0 60 4 YTT 9 Torpedo Trials Craft 3 7,205 21,614 4,323 a 305 b 0 60 328

Miscellaneous Boats and Craft ~5,000 Unknown Unknown Unknown

Military Sealift Command T-AE 26 Kilauea Class Ammunition Ships 3 54,240 162,720 32,544 d 26 4 0 182 T-AFS 1 Mars Class Combat Stores Ships 2 46,930 93,860 23,000 c 148 7 0 647 T-AG 194 Mission Class Navigation Research Ship 1 59,126 59,126 11,825 a 151 10 0 348 T-AGOS 1 Stalwart Class Ocean Surviellance Ship 5 10,987 54,935 10,987 a 70 4 0 148 T-AGOS 19 Victorius Class Ocean Surviellance Ship 4 14,679 58,716 11,743 a 107 5 0 239 T-AGS 26 Silas Bent and Wilkes Surveying Ships 2 13,913 27,826 5,565 a 44 6 0 52 T-AKR 295 Maesrk Class Fast Sealift Ships 1 107,028 107,028 21,406 a 59 9 0 272 T-AKR 287 Algol Class Vehicle Cargo Ships 2 111,650 223,300 44,660 a 109 3 0 902 T-ATF 166 Powhatan Class Fleet Ocean Tugs 2 11,398 22,796 4,559 a 127 16 0 121

U.S. Coast Guard WHEC 378 Hamilton and Hero Class High Endurance Cutters 12 17,339 208,068 41,614 a 151 13 0 1,253 WMEC 230 Storis Class Medium Endurance Cutters 1 9,498 9,498 1,900 a 167 11 0 62 WMEC 213 Diver Class Medium Endurance Cutters 1 8,954 8,954 1,791 a 98 9 0 35 WMEC 270 A Famous Class Medium Endurance Cutters 4 10,976 43,904 8,781 a 137 6 0 228

### Table 2. Vessels Estimated Annual Sacrificial Anode Cathodic Protection Discharges

Class Description Quantity of Vessels w/ Zincs Wetted Surface

Area per Vessel (sq ft) Wetted Surface

Area of Class (sq ft) Total

Amount of Anodes by Class (lbs) Days in

Port per Vessel Number of

Transits per Vessel (e) Days

Operating within 12

n.m. Zinc Discharged

within 12 n.m. (lbs)

WMEC 270 B Famous Class Medium Endurance Cutters 9 10,976 98,784 19,757 a 164 7 0 612 WMEC 210 A Reliance Class Medium Endurance Cutters 5 7,478 37,390 7,478 a 235 13 0 337 WMEC 210 B Reliance Class Medium Endurance Cutters 11 7,157 78,727 15,745 a 149 9 0 453 WAGB 290 Mackinaw Class Icebreakers 1 19,167 19,167 3,833 a 215 b 4 150 356 WTGB 140 Bay Class Icebreaking Tugs 9 4,869 43,821 8,764 a 215 b 1 150 807 WPB 82 C Point Class Patrol Craft 28 1,243 34,804 2,001 a 135 b 6 200 194 WPB 82 D Point Class Patrol Craft 8 1,243 9,944 572 a 135 b 6 200 55 WLB 225 Juniper Class Seagoing Buoy Tenders 2 10,357 20,714 4,143 a 190 18 100 306 WLB 180 A Balsam Class Seagoing Buoy Tenders 8 6,751 54,008 10,802 a 190 18 100 798 WLB 180 B Balsam Class Seagoing Buoy Tenders 2 6,751 13,502 2,700 a 120 5 100 157 WLB 180 C Balsam Class Seagoing Buoy Tenders 13 6,751 87,763 17,553 a 123 16 100 1,078 WLM 551 Keeper Class Coastal Buoy Tenders 2 6,408 12,816 2,563 a 123 b 16 200 249 WLM 157 White Sumac Class Coastal Buoy Tenders 9 4,648 41,832 8,366 a 123 b 16 200 811 WLR 115 River Buoy Tenders 1 3,415 3,415 196 a 160 b 0 205 20 WLR 65 River Buoy Tenders 6 1,583 9,498 546 a 160 b 0 205 55 WLR75 River Buoy Tenders 13 1,823 23,699 1,363 a 160 b 0 205 138 WIX Eagle Class Sail Training Cutter 1 12,264 12,264 2,453 a 188 7 150 217 WLIC 160 Pamlico Class Inland Construction Tenders 4 5,113 20,452 4,090 a 160 b 0 205 415 WLIC 100 Cosmos Class Inland Construction Tenders 3 2,432 7,296 420 a 160 b 0 205 43 WLIC 115 Inland Construction Tender 1 2,796 2,796 161 a 160 b 0 205 16 WLIC 75 A Anvil Class Inland Construction Tenders 2 1,735 3,470 200 a 160 b 0 205 20 WLIC 75 B Inland Construction Tenders 3 1,735 5,205 299 a 160 b 0 205 30 WLIC 75 D Clamp Class Inland Construction Tenders 2 1,735 3,470 200 a 160 b 0 205 20 WLI 100 A Inland Buoy Tender WLI 1 2,432 2,432 140 a 160 b 0 205 14 WLI 100 C Inland Buoy Tender WLI 1 2,068 2,068 119 a 160 b 0 205 12 WLI 65303 Inland Buoy Tender WLI 2 1,037 2,074 119 a 160 b 0 205 12 WLI 65400 Inland Buoy Tender WLI 2 1,142 2,284 131 a 160 b 0 205 13 WYTL 65 A 65 ft. Class Harbor Tugs 3 1,083 3,249 187 a 50 b 6 300 22 WYTL 65 B 65 ft. Class Harbor Tugs 3 1,083 3,249 187 a 50 b 6 300 22 WYTL 65 C 65 ft. Class Harbor Tugs 3 1,083 3,249 187 a 50 b 6 300 22 WYTL 65 D 65 ft. Class Harbor Tugs 2 1,083 2,166 125 a 50 b 6 300 15

Army BCDK Coversion Kit, Barge, Deck Cargo, Deck Enclosure 3 1,202 3,606 721 a 305 b 0 60 55 BD Barges, Derrick 12 1,627 19,524 6,072 c 305 b 0 60 461

### Table 2. Vessels Estimated Annual Sacrificial Anode Cathodic Protection Discharges

Class Description Quantity of Vessels w/ Zincs Wetted Surface

Area per Vessel (sq ft) Wetted Surface

Area of Class (sq ft) Total

Amount of Anodes by Class (lbs) Days in

Port per Vessel Number of

Transits per Vessel (e) Days

Operating within 12

n.m. Zinc Discharged

within 12 n.m. (lbs)

BK Barges, Deck Cargo (nsp) 2 1,155 2,310 736 c 305 b 0 60 56 BPL Pier, Barge Type, Self-Evaluating (nsp) 1 4,955 4,955 991 a 305 b 0 60 75 FMS Floating Machine Shops 3 7,951 23,853 4,771 a 305 b 0 60 362 J-Boat Picket Boats 6 366 2,196 126 a 305 b 0 60 10 LARC-LX Lighter Amphibious Resupply Cargo (formerly BARC) 23 1,214 27,922 6,348 c 305 b 0 60 482 LCM-8 Landing Craft Mechanized 104 1,440 149,760 26,312 c 305 b 0 60 1,997 LCU Landing Craft Utility 48 2,095 100,560 45,264 c 305 b 0 60 3,435 LSV Frank S. Besson Class Logistic Support Vessels 6 17,816 106,896 17,802 c 183 b 6 60 988 LT Inland and Coastal Tugs 19 5,875 111,625 7,866 c 305 b 0 60 597 Q-Boat Picket Boat 1 806 806 161 a 305 b 0 60 12 ST Small Tugs 13 1,318 17,134 2,990 c 305 b 0 60 227 T-Boat Boat, Passenger and Cargo 1 1,335 1,335 77 a 305 b 0 60 6

TOTALS 1,805 10,825,814 1,859,992 113,201

Notes:

(a) Denotes an estimate of amount of anodes on ship class based on a calculated wetted surface area. (b) Denotes an estimate of days in port and number of transits. (c) Denotes actual amount of anodes installed on ship class. (d) Denotes an estimate of amount of anodes on ship class based on a known wetted surface area. (e) Denotes round-trip transits

Vessels with a wetted surface area greater than 3,000 sq ft are assumed to have 23 pound of zinc anodes for each 115 sq ft of wetted surface area. Vessels with a wetted surface area less than 3,000 sq ft are assumed to have 23 pounds of zinc anodes for each 400 sq ft of wetted surface area.

### Table 3a. Chemical Composition, Zinc Anodes (Galvanic Protectors)

Cadmium (range) Aluminum

(range) Zinc

Percent Percent Percent

0.025-0.07 0.1-0.5 approx. 99.3

Table 3b. Chemical Composition, Aluminum Anodes

(Galvanic Protectors)

Indium (range) Zinc

(range) Silicon

(range) Aluminum

Percent Percent Percent Percent

0.014 - 0.020 4.0 - 6.5 0.08-0.20 approx. 95.2

### Table 4. Submarines Estimated Annual Sacrificial Anode Cathodic Protection Discharge

Class Description Quantity of Submarines Total Amount of

Anodes by Class (lbs) (a) Days in Port

per Vessel Number of

Transits per Vessel (b) Zinc Discharged within

12nm (lbs)

SSBN 726 Ohio Class Ballistic Missle Submarine 17 34,408 183 6 1,175 SSN 637 Sturgeon Class Attack Submarine 13 26,312 183 6 899 SSN 688 Los Angeles Class Attack Submarine 56 119,416 183 6 4,079 SSN 671 Narwhal Class Submarines 1 2,024 183 6 69 SSN 640 Benjamin Franklin Class Submarines 2 4,048 183 6 138 Totals 89 186,208 6,360 Notes: (a) Each submarine is assumed to have 88 anodes @ 23 pounds each to protect the prop and stern appendages only. (b) Denotes round-trip transits

### Table 5. Vessels Estimated Annual ICCP Discharges

Class Description Quantity of Vessels w/ICCPs Days within

12 n.m. per Vessel CPO

Discharged within 12 n.m. (lbs) Navy Combatant CV 59 Forrestal Class Aircraft Carrier 1 143 350 CVN 65 Enterprise Class Aircraft Carrier 1 76 186 CV 63 Kitty Hawk Class Aircraft Carrier 3 137 1,007 CVN 68 Nimitz Class Aircraft Carrier 7 147 2,520 CG 47 Ticonderoga Class Guided Missile Cruisers 27 166 10,978 CGN 38 Virginia Class Guided Missile Cruiser 1 161 394 CGN 36 California Class Guided Missile Cruiser 2 143 701 DDG 993 Kidd Class Guided Missile Destroyers 4 175 1,715 DDG 51 Arleigh Burke Class Guided Missile Destroyers 18 101 4,453 DD 963 Spruance Class Destroyers 31 178 13,516 FFG 7 Oliver Hazard Perry Guided Missile Frigates 1 167 409 LCC 19 Blue Ridge Class Amphibious Command Ships 2 179 877 LHD 1 Wasp Class Amphibious Transport Docks 4 185 1,813 LHA 1 Tarawa Class Amphibious Assault Ships 5 173 2,119 LPD 4 Austin Class Amphibious Transport Docks 3 178 1,308 LPD 7 Amphibious Transport Docks 3 188 1,381 LPD 14 Amphibious Transport Docks 2 192 941 LSD 41 Whidbey Island Class Dock Landing Ships 8 170 3,331 LSD 49 Harpers Ferry Dock Landing Ships 3 215 1,580 PC 1 Cyclone Class Coastal Defense Ships 13 105 3,344 Navy Auxiliary AFDB 4 Large Auxiliary Floating Dry Dock 1 365 e 894 AFDB 8 Large Auxiliary Floating Dry Dock 1 365 e 894 AFDL 1 Small Auxiliary Floating Dry Docks 2 365 e 1,788 AFDM 14 Medium Auxiliary Floating Dry Dock 1 365 e 894 AFDM 3 Medium Auxiliary Floating Dry Docks 4 365 e 3,576 AO 177 Jumboised Cimarron Class Oilers 5 188 2,302 AOE 6 Supply Class Fast Combat Support Ships 3 114 838 AOE 1 Sacramento Class Fast Combat Support Ship 4 183 1,793 ARDM Medium Auxiliary Repair Dry Docks 3 365 e 2,682 ARS 50 Safeguard Class Savage Ships 4 208 2,038 Military Sealift Command T-AE 26 Kilauea Class Ammunition Ships 5 26 318 T-AFS 1 Mars Class Combat Stores Ships 6 148 2,175 T-AG 194 Mission Class Navigation Research Ship 1 151 370 T-AGM 22 Compass Island Class Missle Instrumentation Ship 1 133 326 T-AGS 45 Waters Class Surveying Ships 1 7 17 T-AGS 51 John McDonnel Class Surveying Ships 2 96 470 T-AGS 60 Pathfinder Class Surveying Ships 4 96 941 T-AH 19 Mercy Class Hospital Ships 2 184 901 T-AKR 295 Maesrk Class Fast Sealift Ships 2 59 289 T-AKR 287 Algol Class Vehicle Cargo Ships 6 109 1,602 T-AO 187 Henry J Kaiser Class Oilers 13 78 2,484 T-ARC 7 Zeus Class Cable Repairing Ship 1 8 20 T-ATF 166 Powhatan Class Fleet Ocean Tugs 5 127 1,555 U.S. Coast Guard WAGB 399 Polar Class Icebreakers 2 148 725 WPB 110 A Island Class Patrol Craft 16 72 2,822 WPB 110 B Island Class Patrol Craft 21 137 7,047 WPB 110 C Island Class Patrol Craft 12 157 4,615 U.S. ARMY LT Inland and Coastal Tugs 6 60 882

TOTALS 267 98,182

Estimates based on 100 % ICCP anode efficiency at a cuurent of 35 Amps producing 46.3 g/hr. of Chlorine. (e) Denotes an estimate of days in port

### Table 6a. Tidal Prism Model - Zinc From Sacrificial Cathodic Protection Anodes

Class Description Quantity of Vessels w/ Zincs Total

Amount of Anodes by Class (kg) Days in

Port per Vessel Number of

Transits per Vessel (a) Zinc

Discharged in Port (kg) (b) Zinc Conc. in

Port ( μ g/L)

San Diego FFG Oliver Hazard Perry Guided Missile Frigates 11 16,243 167 13 989 SSN Los Angeles Class Attack Submarines 9 8,261 183 6 389 SSN Sturgeon Class Attack Submarine 1 918 183 6 43 LSD Anchorage Class Dock Landing Ships 3 13,894 215 13 965 AGF Raleigh Class Miscellaneous Flagship 1 3,776 183 12 232 AS Emory S Land Class Submarine Tender 1 6,259 293 6 417 LPH Iwo Jima Class Assault Ship 1 4,527 186 11 269

Total 3,304 0.0876

Mayport 

### FFG Oliver Hazard Perry Guided Missile Frigates 10 14,766 167 13 899 1.35

Pearl Harbor FFG Oliver Hazard Perry Guided Missile Frigates 2 2,953 167 13 180 SSN Los Angeles Class Attack Submarine 15 13,769 183 6 648 SSN Sturgeon Class Attack Submarine 4 3,672 183 6 173 SSN Benjamin Franklin Class Submarines 1 918 183 6 43

Total 1,043 0.306

(a) Denotes round-tip transits (b) Based on a hourly zinc dissolution rates of 7.4E-6 lbs. of zinc/lb.anode (static) and 3.0E-5 lbs. of zinc/lb. anode (dynamic)

### Table 6b. Tidal Prism Model - Aluminum and Mercury From Sacrificial Cathodic Protection Anodes

Class Description Quantity of Vessels w/ Al Anodes (a) Total

Amount of Anodes by Class (kg) Days in

Port per Vessel Number of

Transits per Vessel (b) Aluminum/

Mercury Discharged in Port (kg) (c) Aluminum/ Mercury

Conc. in Port (ng/L)

San Diego

SSN Los Angeles Class Attack Submarines 5 4,590 183 6 170 4.50 Al 0.0017 0.000045 Hg

Mayport SSN Los Angeles Class Attack Submarines 0 0 0 Al 0 0 Hg

Pearl Harbor

SSN Los Angeles Class Attack Submarine 5 4,590 183 6 170 49.7 Al 0.0017 0.000497 Hg

(a) Assuming the maximum of 5 submarines with aluminum anodes are located Pearl Harbor and/or San Diego; there are no submarines homeported in Mayport. (b) Denotes round-tip transits (c) Aluminum anode dissolution rates equals zinc anode dissolution dates divided by 3.4 (current capacity ratio)

### Table 6c. Tidal Prism Model - CPO From Impressed Current Cathodic Protection Systems

Class Description Quantity of Vessels w/ ICCP Days in Port

per Vessel CPO Discharged

in Port (kg/yr) CPO Conc. in

Port ( μ g/L)

San Diego CG 47 Ticonderoga Class Guided Missile Cruisers 8 166 1,476 CV 63 Kitty Hawk Class Aircraft Carrier 2 137 304 DD 963 Spruance Class Destroyers 6 178 1,187 DDG 51 Arleigh Burke Class Guided Missile Destroyers 5 101 561 LHA 1 Tarawa Class Amphibious Assault Ships 2 173 384 LHD 1 Wasp Class Amphibious Transport Docks 2 185 411 LPD 4 Austin Class Amphibious Transport Docks 5 178 989 LSD 41 Whidbey Island Class Dock Landing Ships 2 170 378 LSD 49 Harpers Ferry Dock Landing Ships 1 215 239 PC Cyclone Class Coastal Defense Ships 4 105 467

Total 6,395 0.1697

Mayport CG 47 Ticonderoga Class Guided Missile Cruisers 5 166 922 CV 63 Kitty Hawk Class Aircraft Carrier 1 137 152 DD 963 Spruance Class Destroyers 5 178 989 DDG 51 Arleigh Burke Class Guided Missile Destroyers 2 101 224

Total 2,288 3.43

Pearl Harbor AO 177 Jumboised Cimarron Class Oilers 2 188 418 ARS 50 Safeguard Class Savage Ships 2 208 462 CG 47 Ticonderoga Class Guided Missile Cruisers 3 166 553 DD 963 Spruance Class Destroyers 4 178 791 DDG 51 Arleigh Burke Class Guided Missile Destroyers 3 101 337

Total 2,561 0.751

Based on CPO generation rate of 46.3 g/hr. @ 35 amps

### Table 7 - Mixing Zone Models

Sacrificial Anode - Zinc Concentration (ug/L) ICCP - CPO Concentration (ug/L)

Time of Exchange (hrs) Time of Exchange (hrs)

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Distance From Hull(ft) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

24 47 71 94 118 142 165 189 213 236 0.1 43 86 129 172 216 259 302 345 388 431 4.7 9.3 14 19 23 28 33 37 42 47 0.5 8.5 17 26 34 43 51 60 68 77 85 2.3 4.6 6.9 9.2 11 14 16 18 21 23 1 4.2 8.5 13 17 21 25 30 34 38 42 1.1 2.2 3.3 4.4 5.6 6.7 7.8 8.9 10 11 2 2.1 4.1 6.2 8.3 10 12 14 17 19 21 0.72 1.4 2.2 2.9 3.6 4.3 5.0 5.8 6.5 7.2 3 1.4 2.7 4.1 5.4 6.8 8.1 9.5 11 12 14 0.52 1.0 1.6 2.1 2.6 3.1 3.7 4.2 4.7 5.2 4 1.0 2.0 3.0 4.0 5.0 6.0 6.9 7.9 8.9 10 0.41 0.81 1.2 1.6 2.0 2.4 2.8 3.3 3.7 4.1 5 0.78 1.6 2.3 3.1 3.9 4.7 5.4 6.2 7.0 7.8 0.33 0.66 0.99 1.3 1.6 2.0 2.3 2.6 3.0 3.3 6 0.64 1.3 1.9 2.5 3.2 3.8 4.5 5.1 5.7 6.4 0.28 0.55 0.83 1.1 1.4 1.7 1.9 2.2 2.5 2.8 7 0.53 1.1 1.6 2.1 2.7 3.2 3.7 4.3 4.8 5.3 0.23 0.47 0.70 0.94 1.2 1.4 1.6 1.9 2.1 2.3 8 0.46 0.92 1.4 1.8 2.3 2.8 3.2 3.7 4.1 4.6 0.20 0.41 0.61 0.81 1.0 1.2 1.4 1.6 1.8 2.0 9 0.40 0.80 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 0.18 0.36 0.54 0.71 0.89 1.1 1.2 1.4 1.6 1.8 10 0.35 0.71 1.1 1.4 1.8 2.1 2.5 2.8 3.2 3.5 0.11 0.21 0.32 0.42 0.53 0.63 0.74 0.85 0.95 1.1 15 0.22 0.43 0.65 0.87 1.1 1.3 1.5 1.7 1.9 2.2 0.071 0.14 0.21 0.29 0.36 0.43 0.50 0.57 0.64 0.71 20 0.15 0.30 0.45 0.60 0.75 0.90 1.0 1.2 1.3 1.5 0.052 0.10 0.16 0.21 0.26 0.31 0.36 0.42 0.47 0.52 25 0.11 0.22 0.33 0.45 0.56 0.67 0.78 0.89 1.0 1.1 0.040 0.080 0.12 0.16 0.20 0.24 0.28 0.32 0.36 0.40 30 0.087 0.17 0.26 0.35 0.43 0.52 0.61 0.69 0.78 0.87 0.031 0.063 0.094 0.13 0.16 0.19 0.22 0.25 0.28 0.31 35 0.070 0.14 0.21 0.28 0.35 0.42 0.49 0.56 0.63 0.70 0.026 0.051 0.077 0.10 0.13 0.15 0.18 0.20 0.23 0.26 40 0.057 0.11 0.17 0.23 0.29 0.34 0.40 0.46 0.52 0.57 0.021 0.042 0.064 0.085 0.11 0.13 0.15 0.17 0.19 0.21 45 0.048 0.10 0.14 0.19 0.24 0.29 0.34 0.39 0.43 0.48 0.018 0.036 0.054 0.072 0.090 0.11 0.13 0.14 0.16 0.18 50 0.041 0.082 0.12 0.16 0.21 0.25 0.29 0.33 0.37 0.41 0.009 0.018 0.027 0.036 0.046 0.055 0.064 0.073 0.082 0.091 75 0.022 0.043 0.065 0.087 0.11 0.13 0.15 0.17 0.20 0.22 0.006 0.011 0.017 0.022 0.028 0.033 0.039 0.044 0.050 0.055 100 0.013 0.027 0.040 0.054 0.067 0.081 0.094 0.11 0.12 0.13

Input For Calculations Input For Calculations Ship Class FFG 7 Ship Class CG 47 Wetted Hull Area (sqft) 19,850 Wetted Hull Area (sqft) 37,840 Zinc Generation Rate (lb/lb-hr) 7.4E-06 CPO Generation Rate (g/hr) 46.3 CPO Generation Efficiency 100%

### Table 8. Comparison of Constituent Environmental Concentrations and Water Quality Criteria ( μ g/L)

Constituent Tidal Prism Concentrations: San

Diego; Mayport; Pearl Harbor Federal Chronic WQC Most Stringent State Chronic WQC

CPO 0.17; 3.43; 0.75

- 7.5 (CT, HI, MS, NJ, VA, WA) Zinc 0.09; 1.35; 0.31 81 76.6 (WA) Aluminum 0.000005; 0; 0.049 None 1,500 (FL) Mercury* 0.00000004; 0; 0005 0.025 0.025 (CT, FL, GA, MS, VA, WA)

CT = Connecticut FL = Florida GA = Georgia HI = Hawaii NJ = New Jersey MS = Mississippi VA = Virginia WA = Washington

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria. * Bioaccumulator

### Table 9. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X X

2.2 Releases to the Environment X X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X X X 3.2 Rate X X 3.3 Constituents X X 3.4 Concentrations X X 4.1 Mass Loadings X X 4.2 Environmental Concentrations X X X4.3 Potential for Introducing NonIndigenous Species X

### Figure 1. Sacrificial Anode and Impressed Current Cathodic Protection

### Figure 2. Electrochemical Cell

### Figure 3. Impressed Current Cathodic Protection System1. Observed Zinc Consumption Rate: Per 23-lb Anode Per Pound of Anode

(aggregate of in-port and underway) 50% of 23 lb/3 years 3.83 (lb zinc/yr)/ 23 lb anode
= 3.83 lb zinc/yr = 0.167 lb zinc/yr/lb of anode

2. Fraction of Year Vessel is: In Port Underway
176 days/yr 189 days/yr 365 days/yr 365 days/yr

= 0.48 = 0.52

3. Annual Zinc Corrosion/Dissolution Rate: let x = in port corrosion/dissolution rate, and 4x = underway corrosion/dissolution rate 0.48 (x) + 0.52 (4) (x) = 0.167 (lb zinc/yr)/lb of anode x = 0.065 (lb zinc/yr)/lb of anode 4x = 0.261 (lb zinc/yr)/lb of anode
note: the underway corrosion/dissolution rate is 4 times the in port rate as discussed in section 3.2.1 and reference 3 and 10.

4. Hourly zinc corrosion/dissolution rate: In-Port Underway (per lb anode) 0.065 (lb zinc/lb anode)/yr 0.261 (lb zinc/lb anode)/yr 8760 hr/yr 8760 hr/yr

= 7.4 x 10 -6 (lb zinc/lb anode)/hr = 3.0 x 10 -5 (lb zinc/lb anode)/hr

5. Unit conversion: Average density of zinc anodes (Table 2) = (1,862,000 lb) / (10,861,000 ft 2 ) = 0.17 lb/ft 2

In-Port: (7.4 x 10 -6 (lb zinc/lb anode)/hr) ( 0.17 lb/ft 2 ) = 1.3 x 10 -6 (lb zinc/ft 2 )/hr Underway (3.0 x 10 -5 (lb zinc/lb anode)/hr) ( 0.17 lb/ft 2 ) = 5.1 x 10 -6 (lb zinc/ft 2 )/hr



### Calculation Sheet 1. Calculation of Corrosion/Dissolution Rates from Sacrificial AnodesVertical tidal excursions for 1996 is based on the summation of the daily outgoing tides ( i.e., high-high

water to low-low water and high water to low water).

San Diego

• Surface Area = (10,532 acres) (4046.2 m 2 /acre) = 4.26 x 10 7 m 2

• Total annual vertical tidal excursion for 1996 = 884.5 m Average tidal excursion = (884.5 m/yr)/((365 days/yr)(2 tides/day) = 1.2 m

• Tidal prism volume for 1996 = (4.26 x 10 7 m 2 ) (884.5 m) = 3.77 x 10 10 m 3 = 3.77 x 10 13 L

Mayport

• Surface Area = (169.8 acres) (4046.2 m 2 /acre) = 6.87 x 10 5 m 2

• Total annual vertical tidal excursion for 1996 = 970.3 m Average tidal excursion = (970.3 m/yr)/((365 days/yr)(2 tides/day) = 1.3 m

• Tidal prism volume for 1996 = (6.87 x 10 5 m 2 ) (970.3 m) = 6.67 x 10 8 m 3 = 6.67 x 10 11 L

Pearl Harbor

• Surface Area = (3,031 acres) (4046.2 m 2 /acre) =1.23 x 10 7 m 2

• Total annual vertical tidal excursion for 1996 = 278.2 m Average tidal excursion = (278.2 m/yr)/((365 days/yr)(2 tides/day) = 0.38 m

• Tidal prism volume for 1996 = (1.23 x 10 7 m 2 ) (278.2 m) = 3.41 x 10 9 m 3 = 3.41 x 10 12 L



### Calculation Sheet 2. Calculation of Tidal Prism Volumes for San Diego, CA; Mayport, FL; and Pearl Harbor, HI1. Concentration = (Mass of Zinc) / (Volume)

2. Volume modeled as a half-immersed cylinder:

R 1 R 1 + d Length

Ship Class: FFG 7 Length = 415 ft Underwater Wetted Area = 19,850 ft 2 = 1⁄2(2)( π )(R 1 )(length) ==> R 1 = 15.225 ft (1) Volume (model) = V 2 - V 1 V 1 = 1⁄2 π (R 1 ) 2 (length) = 151,110 ft 3 V 2 = 1⁄2 π (R 1 + d) 2 (length) d = variable (1 ft for this sample calculation)

Volume = V 2 - V 1 = [1⁄2 π (15.225 ft + 1 ft) 2 (415 ft)] - (151,110 ft 3 ) = 20,500 ft 3

3. Mass of zinc: Mass = (generation rate)(mass of anode installed)(time between water exchanges) Generation rate = 7.4 x 10 -6 (lb zinc/lb anode-hr) Mass of installed anodes = (172 anodes)(23 lb/anode) = 3,956 lb Time between water exchanges = variable (1 hr for this sample calculation)
Mass of zinc generated = (7.4 x 10 -6 (lb zinc/lb anode-hr))(3,956 lb)(1 hr) = 0.029 lb zinc

4. Concentration: Concentration = (Mass of Zinc)/(Volume) (required conversion factors) = (0.029 lb zinc) (454 g/lb)(10 6 m g/g) /[(20,500 ft 3 ) (28.32 L/ft 3 ) ] = 22.7 μ g/L ≅ 23 μ g/L

notes: (1) Additional significant figures recommended in this step due to subsequent squaring operation.



### Calculation Sheet 3. Zinc Concentration (Mixing Zone Model) Sample Calculations1. Concentration = (Mass of CPO) / (Volume)

2. Volume modeled as a half-immersed cylinder:

R 1 R 1 + d Length

Ship Class: CG 47 Length = 533 ft Underwater Wetted Area = 37,840 ft 2 = 1⁄2(2)( π )(R 1 )(length) ==> R 1 = 22.598 ft (1) Volume (model) = V 2 - V 1 V 1 = 1⁄2 π (R 1 ) 2 (length) = 427,558 ft 3 V 2 = 1⁄2 π (R 1 + d) 2 (length) d = variable (1 ft for this sample calculation)

Volume = V 2 - V 1 = [1⁄2 π (22.598 ft + 1 ft) 2 (533 ft)] - (427,558 ft 3 ) = 38,677 ft 3

3. Mass of CPO: Mass = (generation rate)(efficiency)(time between water exchanges) Generation rate = 46.g/hr Efficiency = 100% Time between water exchanges = variable (1 hr for this sample calculation)
Mass of CPO generated = (46.3 g/hr)(100%)(1 hr) = 46.3 g

4. Concentration: Concentration = (Mass of CPO)/(Volume) (required conversion factors) = (46.3 g CPO) (10 6 m g/g) /[(38,677 ft 3 ) (28.32 L/ft 3 ) ] = 42.3 μ g/L ≅ 42 μ g/L

notes: (1) Additional significant figures recommended in this step due to subsequent squaring operation.



### Calculation Sheet 4. CPO Concentration (Mixing Zone Model) Sample Calculations

### Chain Locker Effluent 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Chain Locker Effluent

### Chain Locker Effluent 2 2.0 DISCHARGE DESCRIPTION

This section describes the chain locker effluent and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Surface vessels of the Armed Forces have one to three anchors, depending on vessel class. 1 

### Each surface vessel’s anchor is attached to at least 810 feet (135 fathoms) of steel chain that is stored below decks in the chain locker when not in use. The chain is constructed in 90-foot (15-fathom) lengths, called “shots,” which are connected together by detachable links. A diagram of a typical detachable link is provided in Figure 1. The inside of each detachable link is greased to prevent binding and corrosion, and to permit easy disassembly of the detachable parts. The chain locker is an enclosed compartment used only to store the anchor chain. 2 

### The bottom of the locker has a grating on which the chain is stowed. Below the grating is a sump. The chain locker sump contains multiple zinc sacrificial anodes to prevent corrosion. The anodes are physically connected (e.g. by bolts or welding) to the steel surface of the chain locker sump. The zinc anode is preferentially corroded or “sacrificed” instead of the chain locker sump’s steel surface.
The chain moves through the chain pipe and the hawse pipe as the anchor is raised or lowered. The chain pipe connects the chain locker to the deck and the hawse pipe runs from the deck through the hull of the ship. When recovering the anchor, the anchor and chain are washed off with a fire hose to remove mud, marine organisms, and other debris picked up during anchoring. Seawater from the fire hose is directed either through the hawse pipe or directly over the side onto the chain while recovering the anchor.
The top of the chain pipe has a canvas sleeve to keep water from entering the chain locker through the chain pipe. Under rare circumstances, like heavy weather, rain or green water (seawater that comes over the bow during heavy weather) gets under the chain pipe canvas cover and into the chain locker. A diagram of a typical chain locker is provided in Figure 2.
Any fluid that accumulates in the chain locker sump is removed by either a drainage eductor for discharge directly overboard or by draining the chain locker effluent into the bilge. As the fluid in the chain locker sump is being drained for overboard discharge, the locker is sprayed with firemain water to flush out sediment, mud, or silt. An eductor is a pumping device that uses a high velocity jet of seawater from the firemain system to create a suction to remove the accumulated liquids and solids. The seawater supply from the firemain system is referred to as motive water for the eductor. OPNAVINST 5090.1B, Section 19-10 requires chain lockers of Navy vessels to be washed down outside of 12 n.m. to prevent the transfer of non-indigenous species and to flush out any sediment, mud, or silt. 2 

### Chain locker effluent which is drained into the bilge becomes bilgewater and is covered by the Surface Vessel Bilgewater/OWS Discharge NOD report.

2.2 Releases to the Environment

### Chain Locker Effluent 3 Chain locker effluent has the potential to contain living plants and animals, including microorganisms and pathogens, that are native to the location where the water was brought aboard during anchor retrieval. Chain locker effluent can also contain paint, rust, grease, and zinc. The chain locker and eductor operations are performed using water from the firemain. Therefore, the chain locker effluent can contain any constituents present in firemain water (see Firemain NOD report).

2.3 Vessels Producing the Discharge
Chain locker discharges occur in surface ships equipped with a wet firemain, including vessels belonging to the Navy, U.S. Coast Guard, Military Sealift Command, Army, and Air Force. 3 

### Submarine chain lockers are always submerged, open to the sea, and do not collect effluent to produce this discharge.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
The Navy has an instruction for chain locker effluent discharge. 2 

### This instruction states that following anchor retrieval, chain lockers shall be washed down outside 12 miles from land to flush out any sediment, mud, and silt. This guideline also helps prevent the transfer of unwanted pathogens and marine organisms present in chain locker effluent.

3.2 Discharge Rate
Rated capacities of the eductors used to pump out chain locker sumps range between 50 and 150 gallons per minute. The chain locker effluent is mixed directly with the motive water from the firemain system before going overboard. The eductor uses 1/2 to 1 gallon of motive water for every gallon of effluent. Therefore, the total discharge ranges between 75 and 300 gallons per minute, of which 25 to 150 gallons per minute is motive water. The amount of effluent discharged yearly cannot be measured because the discharge is infrequent and little effluent is discharged.

3.3 Constituents
The small amount of water that is washed into the chain locker drains through the bottom grating and into the sump where it contacts paint chips, rust, grease, and sacrificial zinc anodes. This water has the potential to contain marine organisms.

### Chain Locker Effluent 4 The chain locker is painted using epoxy polyamide, epoxy, and zinc primer. 1,4,5,6



### The detachable links and other anchor chain components are periodically lubricated with Termalene #2, a water-resistant grease (Commercial Item Description (CID) A -A-50433). Termalene #2 is a compound that includes mineral oil, an aluminum complex, a calcium-based rust inhibitor, an antioxidant, and dye. 7 

### The grease was tested for resistance to washout. 8,9 

### This test measures the water washout characteristics of lubricating greases under elevated temperatures and mechanical operating conditions. Termalene #2 experienced “nil” washout when tested. 9 

### Because the grease is not exposed outside the link and due to the wash-resistant nature of the grease, it is unlikely grease would be released to the environment.
The zinc anodes in the chain locker can be in contact with seawater for extended periods of time. Zinc can leach continuously into the chain locker sump. The water that collects in the chain locker is a combination of seawater and water from the firemain. Also, firemain water is used as motive water when chain locker effluent is discharged. Therefore, the water could contain the constituents present in the firemain water. A more complete discussion of these constituents is found in the Firemain Systems NOD report.
The chain locker effluent might contain the priority pollutants bis(2-ethylhexyl) phthalate, copper, iron, nickel, and zinc. This effluent does not contain any bioaccumulators.

3.4 Concentrations
The concentrations of constituents present in the chain locker cannot be easily measured. Chain lockers are kept dry on most vessels to reduce maintenance. Zinc anodes are present in the bottom of the chain locker. Because the chain locker is often dry, it is unlikely that these anodes significantly affect the concentration of zinc in the effluent. The average measured concentrations of firemain water constituents that exceed the Federal and/or most stringent water quality criteria are presented in Table 1. 10 

### Firemain is used as the motive water for drainage eductors.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. Mass loadings are discussed in Section 4.1 and the concentrations of discharge constituents after release to theenvironment are discussed in Section 4.2. In Section 4.3, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Mass loadings were not calculated because constituent concentrations were not estimated. Chain locker effluent is not anticipated to result in significant loads within 12 n.m. because of the

### Chain Locker Effluent 5 infrequency of discharge and because of the management practices in place which pump this discharge overboard when the vessel is beyond 12 n.m. of shore. Chain locker effluent is discharged infrequently because only small volumes of water accumulate in the chain locker sump over time. This determination was made after inspections of chain lockers aboard several ships. 10,11



### 4.2 Environmental Concentrations
Chain locker effluent is expected to contain zinc, rust, paint, grease, and any constituents from the firemain water. Because of the intermittent nature of this discharge, acute toxicities are the primary concern. There is no concentration data available for chain locker effluent. Table 1 shows the concentration of constituents of firemain water that total nitrogen, bis(2-ethylhexyl) phthalate, copper, iron, and nickel, exceed the Federal and/or the most stringent state acute water quality criteria.

4.3 Potential for Introduction of Non-Indigenous Species
Inspections of chain lockers aboard several ships revealed that only small amounts of water actually accumulate within the chain locker. Therefore, there is little potential for introducing non-indigenous species into the chain locker. The process of washing down the anchor as it is taken aboard and discharging the effluent beyond 12 n.m. further reduces the possibility of transferring species via the chain locker. 2



### 5.0 CONCLUSIONS
The small volume of chain locker effluent results in small mass loadings and provides little opportunity for the transfer of non-indigenous species. The discharge volume is expected to be small even if the discharge was not controlled. Therefore, this discharge has a low potential for causing adverse environmental effects.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Table 2 shows the source of the data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes - Anchor Chain Washdown and Chain Locker Effluent. July 30, 1996.

2. OPNAVINST 5090.1B, Environmental and Natural Resources Program Manual, November 1 1994.

### Chain Locker Effluent 6 3. UNDS Round 2 Equipment Expert Meeting Minutes. March 11 , 1997.

4. Military Specification MIL-P-24441, Epoxy polyamide. July 1991.

5. Performance Specification MIL-PRF-23236, Epoxy. April 1990.

6. Naval Ships’ Technical Manual (NSTM). Chapter 631, Paragraph 8.23.2.1. Preservation of Ships in Service. December 1996.

7. Bel Ray Company, Inc., Material Safety Data Sheet for Termalene #2. 1996.

8. The American Society for Testing and Materials (ASTM) test method D-1264. June 1996.

9. Bel Ray Company, Inc., Product Data Sheet for Termalene #2. 1993.

10. UNDS Phase 1 Sampling Data Report. Volumes 1-13, October 1997.

11. Navy Fleet Technical Support Center Pacific (FTSCPAC) Inspection Report Regarding Elevator Pit and Anchor Chain Locker Inspection Findings on Six Navy Ships, March 3, 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.

### Chain Locker Effluent 7 Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Van der Leeden, et al. The Water Encyclopedia, 2nd Ed. Lewis Publishers: Chelsea, Michigan, 1990.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. 23 March 1995.

### Chain Locker Effluent 8 Figure 1. Schematic Diagram of a Typical Detachable Chain Link

### Chain Locker Effluent 9 Figure 2. Schematic Diagram of a Typical Chain Locker

### Chain Locker Effluent 10 Table 1. Concentrations of Constituents of Wet Firemain Discharge

that Exceed Water Quality Criteria

Constituents Log-normal

Mean Effluent Minimum

Concentration Effluent Maximum

Concentration Effluent Federal Acute

WQC Most Stringent

State Acute WQC

Classicals ( μ g/L) Total Nitrogen 500 None 200 (HI) A Organics ( μ g/L) Bis(2-ethylhexyl) phthalate 22 BDL 428 None 5.92 (GA)

Metals ( μ g/L) Copper Dissolved 24.9 BDL 150 2.4 2.4 (CT, MS) Total 62.4 34.2 143 2.9 2.5 (WA) Iron Total 370 95.4 911 None 300 (FL) Nickel Dissolved 13.8 BDL 38.9 74 74 (CA, CT) Total 15.2 BDL 52.1 74.6 8.3 (FL, GA) Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values.

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington



### Table 2. Data Sources

Data Source

NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X 2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents PMS Cards (a) X 3.4 Concentrations unknown 4.1 Mass Loadings unknown 4.2 Environmental Concentrations unknown4.3 Potential for Introducing NonIndigenous Species X

(a) PMS - Navy planned maintenance system

### Clean Ballast 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Clean Ballast

### Clean Ballast 2 2.0 D ISCHARGE DESCRIPTION
This section describes the clean ballast discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Ballast water is carried by many types of vessels and is held in a variety of tanks. The relative complexity of ballast operations depends on the size, configuration, and requirements of the vessel and on the complexity of its pumping and piping systems.
Clean ballast water is seawater which is introduced into dedicated ballast tanks to adjust a vessel’s draft, buoyancy, trim and list, and to improve stability under various operating conditions. For example, ballast water is used on various vessel classes to replace the weight of off-loaded cargo or expended fuel oil. Generally, seawater is directed to the ballast tanks from the firemain, by flooding, and/or from dedicated ballast pumps. Ballast intake systems are usually covered with a grate; suction strainers can be used to protect the pumping system from debris. Ballast water is discharged through valves by gravity or pressurized air, or is pumped out by eductors. Clean ballast tanks are dedicated to ballasting operations and their contents are not mixed with fuel or oil.
Amphibious assault ships also flood clean ballast compartments during landing craft operations to lower the ship’s stern, allowing the well deck to be accessed. This ballast water is subsequently discharged at the end of the operation. Figure 1 depicts a typical amphibious ship ballast and deballast tank system.
U.S. Navy submarines have main and variable ballast systems. The main ballast system controls the submarine’s overall buoyancy while the variable ballast system controls the submarine’s trim and list, and adjusts for variations in the submarine’s buoyancy while operating submerged.

2.2 Releases to the Environment
Ballast water has the potential to contain plants and animals, including microorganisms and pathogens, that are native to the location where the water was brought aboard. When the ballast water is transported and discharged into another port or coastal area, the surviving organisms have the potential to impact the local ecosystem. Ballast water also has the potential to contain metals and chemical constituents from contact with piping systems and ballast tank coatings. Releases to the environment occur when ballast water is discharged.

2.3 Vessels Producing the Discharge
Ballast water collection and discharge practices depend on vessel class and mission characteristics. Most surface vessels in the Navy have clean ballast systems, including the

### Clean Ballast 3 following vessel classes: amphibious assault ships (LHD, LHA, LPH), aircraft carriers (CV/CVN), amphibious transport docks (LPD), frigates (FFG), dock landing ships (LSD), oilers (AOE), and amphibious command ships (LCC). All U.S. Navy submarines (SSNs and SSBNs) have main and variable ballast systems.
U.S. Coast Guard (USCG) vessels that have designated seawater ballast tanks include the following classes: medium endurance cutters (WMEC), sea going buoy tenders (WLB), and ice breakers (WAGB).
Most Military Sealift Command (MSC) have clean ballast systems, including the following vessel classes: fleet-support auxiliary ships (T-AFS, T-AE, and T-AO), point-to-point supply ships (T-AKR) and other ships (T-AH, T-AGS, T-AGOS, T-AGOR, T-AG, T-AGM, and T-ATF). 1



### Army ships designed f

or intra-theater cargo transport (LCU-2000 and LSV) take on and discharge clean ballast when loading and unloading cargo and equipment. Vessels of the Air Force also discharge ballast water within 12 nautical miles (n.m.) of shore.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
The mode and location of ballast water discharge differs for Navy, USCG, MSC, Army, and Air Force vessels, and also varies among individual ship classes depending on the mission or design of the vessel. Discharge of ballast water is intermittent for vessels of each service. Discharges can occur in port or at sea depending upon service policies and the individual vessel’s operational requirements. Ballast water is normally released at sea (outside of 12 n.m.) or in the same general vicinity from which it was taken aboard.
In order to adopt the intent of guidelines established by the International Maritime Organization (IMO), the Navy has instituted a “double-exchange” policy for surface vessels. 2 

### All Navy surface vessels completely offload ballast water originating in a foreign port outside of 12 n.m. from shore and take on and discharge ‘clean sea water’ two times prior to entry within 12 n.m. of shore. The seawater then can be discharged within 12 n.m. of shore whenever ballast is no longer needed.
All submarines submerge by filling externally mounted main ballast tanks (MBTs) and surface by emptying them. Discharges from MBTs happen mainly during surfacing when seawater in MBTs is displaced overboard by air forced into the tanks. The majority of

### Clean Ballast 4 submarines submerge and surface outside of 12 n.m. of shore, however, submarines on occasion do surface and submerge within 12 n.m. of shore at selected ports where ocean depth and vessel traffic permit this practice. While transiting on the surface from port, variable ballast water can be discharged to make small adjustments to the ship’s trim. Once the submarine submerges, the variable ballast system is used as necessary to maintain trim and stability. In port, both main and variable ballast can occasionally be taken on or discharged to support maintenance activities or to compensate for weight changes. Any ballast water taken on by the MBTs in port is discharged prior to leaving port. While visiting foreign ports, submarines avoid taking water into the variable ballast system. If additional variable ballast water is required, submarines take on freshwater to prevent fouling of systems and equipment.
Amphibious ships take on ballast water in coastal waters (within 12 n.m.) during landing craft operations and discharge it at the conclusion of those operations in the same general location.

USCG vessels d o not discharge ballast water collected near one coastal area into another coastal area. Coast Guard vessels are required to exchange their ballast water twice beyond 12 n.m. of shore, if the water originated from within 12 n.m. 3, 4



### MSC vessels may discharge clean ballast both at sea and in port. The location of the discharge varies by vessel category. Fleet-support auxiliary ships typically load ballast at sea when discharging cargo and unload ballast near shore when taking on cargo. Point-to-point supply ships typically ballast to replace the weight of consumed fuel, not to compensate for off loaded cargo, and deballast occurs after a voyage, usually in port. The remaining ships of the MSC fleet typically ballast to bring the ship to an appropriate draft and trim for mission requirements. Some of these ships may hold ballast for long periods and others may use freshwater ballast only. 1 

### Although an official MSC policy has not yet been approved, many MSC vessels currently abide by IMO guidelines, which recommend exchanging ballast water in waters 2,000 meters or more in depth before entering coastal zones. 5



### Navy, USCG, and IMO policies for surface vessels are summarized in Table 1.

3.2 Rate
The volume of seawater discharged during deballasting operations varies by vessel class and activity. Typical ballasting operations on surface ships only use a portion of the total ballast capacity. For example, the average maximum ballast carried by a T-AO 187 Class ship has been reported to be around 50% of capacity, although the actual quantity of ballast varies significantly depending on the quantity of cargo carried. 1



### Total capacity of individual ballast systems varies significantly by vessel class. The LSD 41 Class and T-AO 187 Class ships have ballast tanks with a capacity of three million gallons. T-AKR 287 Class ships have a total ballast capacity of approximately 1.2 million gallons, while the MSC oceanographic research ship, USNS Vanguard (T-AG 194), carries approximately 1.7 million gallons of freshwater ballast that is only emptied in dry dock during tank inspections. 1,6

### Clean Ballast 5 Other ship capacities for Navy and USCG vessels are as shown in Table 2.
Deballasting flow rates also vary significantly by vessel class. Deballasting methods include gravity fed systems, eductor systems, or compressed air pumps with associated drain valves. Typical air compressors that pressurize and empty ballast tanks on board amphibious ships are rated for 2,000 standard cubic feet per minute (scfm) air flow which is sufficient to displace an equivalent of 14,960 gallons per minute (gpm) of ballast water. Main ballast tanks on submarines are typically evacuated within 30 minutes using pressurized air. 7



### 3.3 Constituents
Constituents of clean ballast may include material from piping and piping components, coatings, and additives.
Rust inhibitors containing aliphatic petroleum distillates are commonly applied to some MSC ballast tanks. Additional constituents may include flocculant chemicals, composed of 95% water and 5% salts and polymers. 8 

### Flocculant chemicals are introduced in ballast tanks of some MSC vessels to facilitate the discharge of suspended silts during deballasting operations. Sediments frequently accumulate on the bottom and on many horizontal surfaces of ballast tanks and may be discharged during deballasting operations. Lead-block ballast are also present in the ballast tanks on some MSC vessels.
Metals and chemical constituents can be introduced to ballast water through contact with piping systems and ballast tank coatings. Constituent loadings are expected to increase with increased residence time of water in the clean ballast systems. The composition of piping and components that contact ballast water includes iron, copper, nickel, bronze, titanium, chromium, and composites. These composites are a linen reinforced graphite phenolic compound and reinforced epoxy matrix. Fitting and valve materials include aluminum, copper, nickel, and silver-brazed materials. Synthetic and cloth-rubber gaskets, nitrile seals, and ethylene propylene rubber O-ring seals may also be wetted parts of the ballast system. 9,10



### The interiors of tanks of Navy vessels are typically coated with epoxy coatings, and the tanks can contain zinc or aluminum anodes for cathodic protection. 11,12 

### Ballast tank coating specifications list the following constituents: polyamide, magnesium silicate, titanium dioxide, a solvent, naphtha, and epoxy resin. Specifications also dictate the maximum allowable concentrations of solvents in epoxy coatings.
Firemain systems are used to fill many clean ballast tanks. Although concentrations in firemain discharge cannot be directly correlated with constituent concentrations in clean ballast water, analytical data obtained from sampling of shipboard firemain systems could serve as an indicator of potential constituents introduced to clean ballast water. Based on the make up of clean ballast systems and the analytical results of firemain discharge sampling, the following priority pollutants could be present within the discharge: copper, nickel, and zinc. No bioaccumulators are known or suspected to be present in clean ballast discharge.

### Clean Ballast 6 3.4 Concentrations
Although suspected constituents in clean ballast discharge have been identified, constituent concentrations were not estimated.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. Mass loadings are discussed in Section 4.1 and the concentrations of discharge constituents after release to theenvironment are discussed in Section 4.2. In Section 4.3, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Using known tank volumes and numbers of vessels in specific classes, an estimate of the total ballast capacity is presented in Table 2. Most surface vessels are required to conduct double exchanges outside of 12 n.m. of shore unless the discharge of the clean ballast is located in the same geographical region as the intake, or operational conditions prevent the double flush from being performed. Additional ballast exchanges occur within 12 n.m. Although total ballast capacity estimates have been made, mass loading of chemical constituents were not estimated due to the uncertainty in the frequency of ballasting operations and the lack of chemical constituent data.

4.2 Environmental Concentrations
Although water quality criteria are available for suspected con stituents, no analyses have been completed and constituent concentrations are not available. A comparison of concentrations with water quality criteria was not made.

4.3 Potential for Introducing Non-indigenous Species
Discharged clean ballast water from vessels of the Armed Forces has potential for introducing non-indigenous species into receiving waters. This can be inferred from studies of commercial vessels.
Studies of foreign ballast water commonly introduced into the Chesapeake Bay found that more than 90% of the commercial vessels carried live organisms. Forty percent of the sampled vessels had organisms within their ballast tanks including dinoflagellates and diatoms. Such organisms are suspended in both water and sediments within ballast tanks. Organisms also may attach to tank walls and be dislodged during deballasting. 13 

### One study characterized a variety of non-indigenous species in 159 cargo vessels arriving in Coos Bay, Oregon, from 25 different Japanese ports. The study found 367 distinctly identifiable taxa, representing 16 animal phyla, 3 protist phyla, and 3 plant divisions. Organisms present in most vessels included copepods (99%

### Clean Ballast 7 of vessels), polycheate worms (89%), barnacles (83%), clams and mussels (71%), flatworms (65%), crabs and shrimp (48%), and chaetognaths (47%). 13



### The preliminary conclusion of a Smithsonian Environmental Research Center (SERC)study of three Navy surface ships’ ballast water during transit of the Atlantic is that the doubleexchange of ballast water can be a “very effective” method of preventing the introduction of nonindigenous species. The SERC study performed a double-exchange of clean ballast water containing a known number/concentration of microbials and found that 95% to 100% of the microbials were removed. 14 

### The SERC study noted that a “large number” of the microbials would not have survived the transit even if the double exchange of ballast water had not been performed. Therefore, the percentage reduction of the number or type of non-indigenous species transported in the ballast water of Navy surface vessels achieved by double-exchange has not been determined.
Although the presence of non-indigenous species has been verified by previous studies of commercial vessels, exact densities of individual species introduced through deballasting operations of vessels of the Armed Forces have not been evaluated.

5.0 CONCLUSION
Clean ballast discharges have a potential to cause an adverse environmental effect because clean ballast water has the potential for transferring non-indigenous species between ports.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information, equipment specifications, and research concerning non-indigenous species was used. Table 3 shows the sources of data used to develop this NOD report.
Specific References

1. Weersing, Penny, Point Paper - Supplemental Information about Ballast Water - MSC Ships. 31 October 1996.

2. Department of the Navy , Office of the Chief of Naval Operations. Summary Matrix of OPNAVINST 5090.1B, Environmental and Natural Resources Program Manual, Chapter 19-10 (Ship Ballast Water and Anchor System Sediment Control Requirements). 1 November 1994.

3. Directive Order. COMLANTAREA COGARD, Portsmouth, VA to LANT CUTTER FLT. Ballast Water Exchange Program, 14 August 1996.

### Clean Ballast 8 4. Directive Order. COMPACAREA COGARD, Alameda, CA. PACAREA Aquatic Prevention Program, 12 November 1996.

5. Weersing, Penny, Attachment 4, Point Paper - Supplemental Information about Ballast Water - MSC Ships. Summary Matrix of OPNAVINST 5090.1B. 31 October 1996.

6. UNDS Equipment Expert Meeting Minutes - Clean Ballast. 18 September 1996.

7. Letter from Commander Submarine Force, U. S. Atlantic Fleet to Commander, Naval Sea Systems Command (00T); Ser N451A/4270 dated 13 Dec 1996; COMSUBLANT Response to UNDS Data Call; 688 Class and 726 Class Submarine Discharge Data Package.

8. Ashland Chemical Company. Material Safety Data Sheets - Magnakote Rust Preventative and Mud Conditioner. 8 February 1995 and 10 February 1995.

9. Mil. Spec. MIL-P-83461, “Packings, Preformed, Petroleum Hydraulic Fluid Resistant, Improved Performance at 275oF (135oC)”.

10. Mil. Spec. MIL-G-22050, “Gasket and Packing Material, Rubber for Use With”.

11. Mil. Spec. MIL-P-24441, “Paint, Epoxy-Polyamide, General Specification For”.

12. Mil. Spec. MIL-PRF-23236, “Paint Coating Systems, Fuel and Salt Water Ballast Tank”.

13. Chesapeake Bay Commission. The Introduction of Nonindigenous Species to the Chesapeake Bay Via Ballast Water - Strategies to Decrease the Risks of Future Introductions through Ballast Water Management. 5 January 1995.

14. Ruiz, Greg. Non-Indigenous Species Presentation - Notes by Dan G. Mosher, Malcolm Pirnie, Inc. 18 September 1996.

15. International Maritime Organization (IMO). Guidelines for Preventing the Introduction of Unwanted Aquatic Organisms and Pathogens from Ships’ Ballast Water and Sediment Discharges, 10 May 1995

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.

### Clean Ballast 9 USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
National Research Council. Stemming the Tide, Controlling Introductions of Nonindigenous Species by Ship’s Ballast Water. National Academy Press, 1996.
Aivalotis, LT Joyce. UNDS Info, 18 February 1997, Doug Hamm, Malcolm Pirnie, Inc.
Naval Sea Systems Command (NAVSEA). Ship Information Book, S9CVN-CD-SIB-020, CVN 70 Vol. 2, Pt. 1, Bk 1, Chapter 11, Drainage and Ballasting Systems, Section 3, Sea Water Ballasting System.
Naval Sea Systems Command (NAVSEA). Ship Information Book, S9LHA-AA-SIB-020, LHA 1, Section 7-41, Ballast/Deballast System.

### Clean Ballast 10 Naval Sea Systems Command (NAVSEA). Ship Information Book, 0905LP-123-6010, LCC 19, Section 2, Chapter 1, Fuel Oil Tank Stripping and Clean Ballast Systems.
Naval Sea Systems Command (NAVSEA). Ship Information Book, S9LHD-AA-SIB-060, LHD 1, Chapter 14, Ballast/Deballast System.
Naval Sea Systems Command (NAVSEA). Ship Information Book, S9LPD-AD-SIB-020, LPD 4, Vol. 2, Pt. 1, Table 7-2, Approximate Time to Ballast & Deballast Tanks.
Naval Sea Systems Command (NAVSEA). Ship Information Book, S9LSD-BH-SIB-100, LSD 41, Vol. 7, Ballasting/Deballasting.
Columbia/HCA Healthcare Corporation. Epidemic Cholera in the New World: Translating Field Epidemiology into New Prevention Strategies. 2 October 1996.
Krotoff, Oleg, Ashland Chemical. Conversation with Oleg Krotoff, Env. Engineer, Ashland Chemical, 13 May 1997, Doug Hamm, Malcolm Pirnie, Inc.
UNDS Equipment Expert Meeting Round Two - Clean Ballast. 15 April 1997.
Weersing, Penny, MSC. UNDS: Clean Ballast, 15 May 1997, Doug Hamm, Malcolm Pirnie, Inc. UNDS Equipment Expert Meeting - Clean Ballast. 18 September 1996, M. Rosenblatt & Son, Inc.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Clean Ballast 11 Figure 1. Typical Amphibious Ship Ballast and Deballast Tank Piping Composite

### Clean Ballast 12 Table 1. Summary of IMO, USCG, and Navy Exchange Policies for Clean Ballast Water From Surface Vessels

NAVY 2 

### USCG 3,4 

### IMO 15

Requires potentially polluted ballast water to be offloaded outside of 12 n.m. from shore and clean sea water taken on and discharged twice prior to entry within 12 n.m. from shore. Requires potentially polluted ballast water to be offloaded outside of 12 n.m. from shore and clean sea water taken on and discharged twice prior to entry within 12 n.m. form shore. Recommends ballast water exchange to take place in areas with a depth of 2000 meters or more tominimize the introduction of nonindigenous invasive species.

Requires entering records of ballast water exchanges and their geographical location in ship’s engineering log. Requires entering records of ballast water exchanges and their geographical location in ship’s engineering log. Recommends record keeping of ballast water exchange, sediment removal, procedures used, and appointment of responsible officer on board ships to ensure procedures are followed and records maintained.



### Table 2. Estimate of Total Ballast Capacity *

Vessel Class Service Ballast Capacity (Gallons) # Vessels Total Capacity (Gallons) T-AO 187 MSC 3,000,000 12 36,000,000 T-AKR 287 MSC 1,200,000 8 9,600,000 T-AG 194 MSC 1,700,000 1 1,700,000 WMEC 270 A&B USCG 42,250 13 549,250 WLB 225 USCG 92,300 2 184,600 WAGB 399 USCG 115,300 2 230,600 LHA 1 Navy 3,445,867 5 17,229,335 CVN 68 Navy 278,533 7 1,949,731 LCC 19 Navy 593,383 2 1,186,766 LPD 4 Navy 3,700,000 8 29,600,000 LSD 41 Navy 3,090,000 8 24,720,000 LHD 1 Navy 4,000,000 4 16,000,000 AOE 6 Navy 209,941 3 629,823 SSBN 726 Navy 668,904 17 11,371,368 SSN 688 Navy 229,225 56 12,836,600 LSV Army 403,000 6 2,418,000 LCU-2000 Army 111,369 35 3,897,915 Total: 170,103,988 

### Estimate is based upon the largest vessels of the Navy, USCG, MSC, and Army that use clean ballast. Ballast volumes of vessels of the Air Force are not included.

### Clean Ballast 13 Table 3. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents X 3.4 Concentrations N/A 4.1 Mass Loadings N/A 4.2 Environmental Concentrations N/A4.3 Potential for Introducing NonIndigenous Species X X

### Compensated Fuel Ballast 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Compensated Fuel Ballast

### Compensated Fuel Ballast 2 2.0 DISCHARGE DESCRIPTION
This section describes compensated fuel ballast discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Compensated ballast tanks are used for fuel storage and to maintain stability on some classes of Navy vessels. As fuel is consumed while underway, water is taken in by the vessel to maintain a nearly constant total fluid weight in the vessel. Compensated fuel ballast tanks are maintained full of either fuel, seawater, or a combination of both. When both fuel and seawater are present in the same tank, the fuel floats on top of the seawater because the fuel is less dense. These tanks are only completely emptied of all fluid (seawater and fuel) during in-tank maintenance or modification work that is not part of the ships’ normal operation.

In vessels that u se compensated fuel ballast systems, several compensated fuel ballast tanks are connected in series to form a tank group. The first tank of the group is called the “receiving tank.” Fuel enters and exits the tank group via the receiving tank. The last tank of the group is called the “overflow/expansion tank.” Seawater enters and exits the tank group via the overflow/expansion tank from the ship’s firemain. Compensating water is introduced into the overboard discharge pipe of the overflow/expansion tank through a level control valve. This valve maintains a constant pressure within the compensated fuel tanks. The compensated ballast/fuel storage tanks are in between the receiving and the overflow/expansion tanks. All the tanks in the group are connected by sluice pipes. Each tank in the group has an upper and lower sluice pipe. The lower sluice pipe in the first tank of the group is connected to the upper sluice pipe of the next tank in the series. The upper sluice pipe in the receiving tank connects to the ship’s fill and transfer fuel piping and allows fuel to enter and leave the tank group. The lower sluice pipe of the overflow/expansion tank allows seawater to enter and leave the tank group. Figure 1 shows a schematic diagram of the tank group interconnection pipes.
Each Navy surface vessel using a compensated fuel ballast system has six tank groups in adjacent tank group pairs; two tank groups forward, two tank groups midship, and two tank groups aft. Figure 2 shows the general layout of the six tank groups. For each adjacent tank group pair, there is one port tank group and one starboard tank group. Each tank group consists of three to six tanks connected in a series: a receiving tank, one to four storage tanks, and an overflow/expansion tank. The overboard discharge from each adjacent port and starboard tank group are cross-connected resulting in a port-starboard pair of overboard discharges forward, midship, and aft. Figure 3 illustrates a typical fuel oil tank layout for pair of port and starboard tank groups with cross-connected overflow piping on a surface vessel.
During a fueling operation, fuel enters the receiving tank via the inlet sluice pipe and pushes seawater through the rest of the tanks in the group via the sluice pipes. By simple displacement, an equal amount of seawater is discharged overboard from the overflow/expansion tank. Each tank in the group fills in sequence since fuel cannot get into the next tank in the series

### Compensated Fuel Ballast 3 until the fuel level reaches the lower sluice pipe of the tank being filled. When the fuel level reaches the lower sluice pipe in a tank the fuel starts to flow into the next tank in the series via the sluice pipe. Operating procedures dictate that the fueling process be stopped prior to fuel entering the overflow/expansion tank. 1 

### The overflow/expansion tank is intended to hold only seawater, acting as a buffer between the fuel storage tanks and the overboard discharge. This tank is used to prevent the accidental discharge of fuel overboard due to overfilling of the tank group, or due to the thermal expansion of the fuel when ambient temperatures increase.
Fuel is transferred via purifiers to uncompensated fuel service tanks prior to use by ship’s propulsion and electrical generating plants. Only fuel from the service tanks is used to power the ship’s propulsion and electrical generating plants, fuel is not taken directly from the compensated fuel ballast tanks to the engines. Therefore, compensating water is not taken on when the ship’s engines are operating in port.
Non-conventional submarines have a compensated fuel ballast system to provide fuel for the emergency diesel generator. This compensated fuel ballast system consists of a Normal Fuel Oil (NFO) tank and a seawater expansion tank. Compensating water is not discharged to the surrounding water under any normal operating condition. When fueling, the displaced seawater is removed from the NFO tank via the seawater compensating line and is transferred via a hose connection to a port collection facility for treatment and disposal. 2 

### While operating at sea, compensating seawater is not discharged from the NFO tank because an air charge in the expansion tank compresses to account for volumetric changes due to hull compression during changes in ship depth or as a result of tank liquid temperature changes.
Mixing of the fuel into seawater discharged from the overflow/expansion tank is believed to occur via the following mechanisms:

• Fuel and water can be mixed by turbulence in the tank during rapid introduction of fuel or water, or the rolling motion of the ship. The turbulence is caused by fluid flow around internal tank structure and by interfacial shear between the fuel and the water layers.

• Internal tank structure can cause incorrect fuel level readings and inadvertent discharge of fuel with the compensated ballast water by trapping pockets of fuel and seawater.

• Soluble fuel constituents can be dissolved in seawater.
Some of the design and operational practices used by the Navy to mitigat e fuel discharges from compensating ballast systems include:

• Engineering Operating Sequencing Systems (EOSS) fuel filling procedure “Standard Refueling, Fuel Oil” (SRFO) and the Class Advisories (temporary operating instructions and notices) for destroyers and conventional cruisers recommend that fuel storage tanks be refueled to no greater than 85 percent of capacity in port. 1-4 

### This

### Compensated Fuel Ballast 4 prevents the fuel/seawater interface from entering the overflow/expansion tank and overboard discharge pipe.

• EOSS fuel filling procedure SRFO and the Class Advisories for the same vessels direct that the in-port flow limiting valves in the supply to each tank group be closed during in-port refueling only (open while refueling at sea). The flow limiting valves restrict the fill rate to each tank group to approximately 400 gallons per minute (gpm) versus 1000 gpm while at sea. This reduces fuel/seawater mixing in the tank. 1-4



### • EOSS fuel filling procedure SRFO requires individuals to stand watch to halt refueling in the event of overboard spills, while others are required to monitor fuel levels in each tank during the refueling operation. 1



### 2.2 Releases to the Environment
As discussed in Section 2.1 compensated ballast discharge occurs through the overflow/expansion tank during refueling operations. Compensated ballast discharge consists primarily of seawater containing some fuel constituents. Leaching and corrosion of fuel containment systems are expected to result in the presence of metals.

2.3 Vessels Producing the Dis charge
The Navy is the only branch of the Armed Forces whose vessels utilize compensated fuel ballast systems. Compensated fuel ballast systems are used only on CG 47 Class cruisers; DD 963 Class, DDG 993 Class, and DDG 51 Class destroyers; and all non-conventional submarine classes. 2 

### A total of 75 U.S. based surface vessels generate this discharge. Submarine compensated fuel ballast systems do not discharge to the surrounding water whether in port or at sea. USCG, MSC, Army, Air Force, and Marine Corps vessels do not utilize compensated fuel ballast systems and do not generate this discharge.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Local ity
In-port refueling of surface ships is the only circumstance during which compensated ballast discharge occurs within 12 nautical miles (n.m.). At-sea refueling operations take place outside of 12 n.m. based on standard operating practice.

3.2 Rate

### Compensated Fuel Ballast 5 During in-port refuelings of surface vessels, compensated ballast is discharged at a rate of up to 400 gpm per tank group (2,400 gpm maximum per ship). Based on actual refueling data obtained from Navy personnel, each ship takes on about 200,000 gallons per refueling in port and the refuelings occur on average two times per year per ship. 5



### 3.3 Constituents
The Navy has conducted several studies of compensated ballast in the past. These included:

• in-port refueling test of the USS Nicholson (DD 982); 6



### • at-sea refueling testing of the USS Spruance (DD 963); 7



### • in-port and at-sea testing of the USS John Hancock (DD 981); 8 

### and

• in-port testing of the USS Arleigh Burke (DDG 51). 9,10



### These previous studies have typically measured the oil concen tration of the discharge. On the DDG 51, in-line oil content monitors were used in conjunction with standard laboratory analyses to determine the oil concentration in the discharged ballast water. Table 1 summarizes the data for oil concentration in compensated ballast water from the previous Navy studies. The concentration of oil in water varied from below detection levels to 370 milligrams per liter (mg/L).
To further support this NOD report, a sampling effort was conducted. Five samples of compensated ballast discharge, and an additional quality assurance/quality control sample, were taken through the course of an in-port refueling operation from the discharge of a single midship tank group of the USS Arleigh Burke, (DDG 51) on January 27, 1997. 11 

### Based on previous Navy operational and design experience, midship tank groups on DDG 51 Class vessels are expected to contain the greatest concentration of fuel oil constituents in the ballast water. The samples were analyzed for volatile and semivolatile organics, selected classical pollutants, metals, and mercury using EPA series 1600 protocols. Table 2 presents a summary of the validated analytical data for all detected analytes from the sampling effort that occurred on January 27, 1997. The following priority pollutants were present in measurable amounts: copper, nickel, silver, thallium, zinc, benzene, phenol, and toluene; 12 

### the only bioaccumulator found was mercury. 13 

### Also, during the UNDS sampling effort, 8 additional samples were taken and analyzed for TPH by the modified 418-2 method, with results ranging from 11.9 to 108.2 mg/L. 14



### 3.4 Concentrations
As mentioned in Section 3.3, Table 2 presents the validated analytical data from the UNDS sampling effort. The table includes metals, volatile organics, semivolatile organics, classicals, and mercury. The table shows the constituents, the log-normal mean, the frequency of detection for each constituent, the minimum and maximum concentrations, and the mass loadings of each constituent. For the purposes of calculating the log-normal mean, a value of one-half the detection limit was used for non-detected results.

### Compensated Fuel Ballast 6 In addition to the oil concentration data collected in previous sampling as described in Table 1, two separate sets of analyses were developed from the UNDS sampling effort to support this NOD report. The samples were analyzed for Hexane Extractable Materials (HEM) andSilica Gel Treated (SGT) -HEM. The HEM values correspond to oil and grease and the SGTHEM values correspond to total petroleum hydrocarbon (TPH) which is a subset of oil andgrease. The results varied from 8 to 36.5 mg/L for HEM and from 6 to 12.5 mg/L for SGTHEM. 11



### 4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
Based on ship transit data, Navy surface ships with compensated ballast systems are at their homeport (within 12 n.m.) between 101 and 178 days per year, and at sea for the balance of the year. 15 

### A per-ship total annual discharge of 400,000 gallons per year was calculated based upon the following averages obtained from Navy refueling data: 5



### • 200,000 gallons median discharge per in port refueling; and

• 2 refuelings in port per year.
As mentioned in Section 2.3, 75 surface vessels are homeported in the U.S. and generate compensated ballast within 12 n.m. of the U.S. 16 

### The majority of these ships’ in-port refuelings occur at their homeport. Flow per ship class can be roughly approximated as the product of the number of vessels in a class and 400,000 gallons discharged per ship per year as presented in Table 3. The 75 U.S. based surface vessels discharge 30.0 million gallons within the 12 n.m.

zone.
Total mass loading, for in-port discharges, was estimated by multiplying the log-normal mean concentration by the total compensated ballast discharge volume of 30.0 million gallons per year. The generalized equation is shown below:

Mass Loading (lbs/yr) = (Concentration ( μ g/L))(Volume (gal/yr))(3.785 L/gal)(2.2 lbs/kg)(10 -9 

### kg/ μ g)

Based on the SGT-HEM log-normal mean concentration of 4.65 mg/L the TPH loading could be 1,160 pounds per year (lbs/yr). Based on the HEM log-normal mean concentration of 12.73 mg/L, the total estimated oil & grease loading from in-port discharges could be expected to

### Compensated Fuel Ballast 7 be 3,180 lbs/yr.
Using the metal log-normal mean concentrations as listed in Table 2; the mass loadings are estimated to be 13.3 lbs/yr for copper; 47.4 lbs/yr for nickel; 2 lbs/yr for thallium; 1,063lbs/yr for zinc; 0.77 lbs/yr for silver; and 0.00015 lbs/yr for mercury. Using the organic lognormal concentration in Table 2, the mass loading was estimated to be 10.3 lbs/yr for 2-Propenal; and 22 lbs/yr for benzene. Using the log-normal concentration in Table 2, the mass loading was estimated to be 65 lbs/yr for ammonia, 97 lbs/yr for nitrogen, and 15 lbs/yr for phosphorous. These mass loadings are summarized in Table 4. The ratio of the number of vessels in each U.S. homeport to the total of 75 compensated ballast vessels allows the loadings to be proportioned as shown in Table 5.

4.2 Environmental Concentrations
Screening for acute toxicity was accomplished by comparing the log-normal mean resulting from the UNDS sampling to Federal or the most stringent state water quality criteria for these constituents. These data are provided in Table 6. Individual sample concentrations exceed Florida criteria for oil, as indicated by SGT-HEM, but the log-normal mean does not; however, this discharge has demonstrated that potential for causing a sheen when procedural controls are not used. 6,8 

### Discharge of Oil , 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. The Federal discharge standard is 15 mg/L based

on International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS).
The log-normal mean concentrations for copper, nickel, silver, and zinc samples exceed both Federal and most stringent state water quality criteria (WQC). The most stringent state criteria are exceeded by the log-normal mean concentration for 2-Propenal, ammonia, benzene, HEM, total nitrogen, phosphorous, and thallium. Mercury, a persistent bioaccumulator, was present in three of the four samples, although it did not exceed WQC.

4.3 Potential for Introducing Non-Indigenous Species
Water taken into the fuel tanks during refueling could contain non-indigenous species, but it is unlikely that the organisms will be transferred between ports for the following reasons:
1) Water is not taken into the compensated fuel ballast tanks during refueling operations – water is only discharged during this operation. Water is only taken into the compensated fuel ballast tanks during fuel transfer operations (either between compensated fuel ballast tank groups or from a compensated fuel ballast tank to a fuel service tank). Water could be taken into the compensated fuel ballast tanks prior to a refueling operation because ship’s personnel are trying to maximize the fuel storage on board by transferring fuel from the compensated ballast tanks to top off the fuel service tanks. This process is normally done at-sea prior to entering to a port facility. This process also prevents silt and debris from shallow harbors from being introduced into the tanks.

### Compensated Fuel Ballast 8 2) If the ship has been generating its own electrical power for an extended period while in-port then the fuel transfer may take place in the harbor prior to the refueling in order to maximize the fuel stored on-board the vessel. However, the refueling that takes place immediately after the fuel transfer will discharge the compensating water back into the same harbor.
3) Compensating water from the fuel storage tanks is frequently flushed while the ship is at sea due to frequent refuelings. Navy surface ships with compensated ballast systems normally refuel every three to four days while out at sea to prevent fuel levels from dropping below 70% capacity. Based on ship transit data, these ships are at sea between 187 and 264 days per year. 11 

### Using the minimum number of days at sea (187), and assuming that the ship is refueled at-sea every 4 days, results in an estimate of approximately 46 at-sea refuelings per year compared to two in-port refuelings per year. Therefore, there is little chance for compensating water that may have been taken on in one port to be discharged in another port

.

5.0 CONCLUSIONS
Uncontrolled, compensated ballast discharge has the potential to cause an adverse environmental effect because significant amounts of oil are discharged during a short duration at concentrations that exceed discharge standards and water quality criteria. This discharge has been reported to cause an oil sheen when procedural controls are not applied. 6,8



### 6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information and assumptions were used to estimate the rate of discharge

. Based on this estimate and on the reported concentrations of the constituents, the concentrations of the constituents in the environment resulting from this discharge were compared with relevant water quality criteria. Table 7 shows the sources of data used to develop this NOD report.
Specific References

1. Naval Sea Systems Command, Engineering Operating Sequencing System (EOSS), Operational Procedure Fuel Oil Refueling, Code SRFO/0319/032596.

2. UNDS Equipment Expert Meeting Minutes - Compensated Fuel Ballast. July 24, 1996.

3. Naval Sea Systems Command, DD 963 - DDG 993 Class Advisory NR 04-94, Inport Refueling / Operational Procedures, 2 May 1994.

4. Naval Sea Systems Command, DDG 51 Class Advisory NR 22-95, Fuel Tank Level Indicator Alignment Procedures, 21 December 1995.

### Compensated Fuel Ballast 9 5. Report of Travel, Compensated Fuel Ballast System NCCOSC-NRaD, San Diego, 12 March 1997.

6. Oil Concentrations in Ballast Water During In-Port Refueling of USS Nicholson (DD 982). DTNSRDC Report TM-28-81-145 (December 1981).

7. Oil Concentrations in Ballast Water During At-Sea Refueling of USS Nicholson (DD 982). DTNSRDC Report TM-28-82-158 (December 1982).

8. Evaluation of

DD-963 Class Fuel/Ballast Expansion Tank Modifications Aboard USS JOHN HANCOCK (DD 981). DTNSRDC Report TM-28-83-171 (May 1984).

9. SEA 05Y32 Preliminary Trip Report/Test Brief. DDG 51 In-Port Refueling Test, August 12-14, 1992.

10. SEA 05Y32 DDG 51 Post-PSA In-Port Fueling Test. August 4, 1992.

11. UNDS Phase I Sampling Data Report, Volumes 1-13, October 1997.

12. Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.

13. The Wate r Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

14. Compensated Ballast Sample Analysis Results from DDG 51 In-port Refueling, 27 January 97, Commanding Officer, Naval Surface Warfare Center, Carderock Division, Philadelphia Site, Philadelphia, PA, letter 9593, Ser 631/63 of 14 February 1997.

15. UNDS Ship Database, August 1, 1997.

16. The United States Navy, List of Homeports, Homeports and the Ships Assigned, Effective May 22, 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.

### Compensated Fuel Ballast 10 USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).

### Compensated Fuel Ballast 11 Figure 1. Fuel Tank Group 3 and 4 (Typical) Compensated Seawater Ballast

### Compensated Fuel Ballast 12 Figure 2. Compensated Fuel Ballast Tank Layout

### Compensated Fuel Ballast 13 Figure 3. Typical Port and Starboard Tank Groups with Cross-connected Overflow

### Compensated Fuel Ballast 14 Table 1. Oil Concentrations in Compensated Ballast Waters (mg/L)

Previous Navy Studies USS Nicholson DD 982 6 

### (in-port) USS Spruance

DD 963 7 

### (at-sea) USS John Hancock

DD 981 8 

### (in-port) USS Arleigh Burke

DDG 51 10,11 

### (in-port) 2 to 149 < 60 <1 to 370 0.0 to 10.35 (lab) mg/L - milligrams of oil per liter of fluid (lab) - laboratory analysis results for physical samples taken during testing

### Compensated Fuel Ballast 15 Table 2. Summary of Detected Analytes for Compensated Ballast Discharge

Constituent Log Normal Frequency of Minimum Maximum Mass Loading Mean Detection Concentration Concentration (lbs/yr) Classicals (mg/L) ALKALINITY 46.72 4 of 4 45 49 11,671 AMMONIA AS NITROGEN 0.26 4 of 4 0.19 0.3 65 BIOCHEMICAL OXYGEN DEMAND 6.82 1 of 4 BDL 12 1,704

CHEMICAL OXYGEN DEMAND (COD) 429.25 4 of 4 380 490 107,231

CHLORIDE 16042.18 4 of 4 15400 16800 4,007,497 HEXANE EXTRACTABLE MATERIAL 12.73 4 of 4 8 36.5 3,180

SGT-HEM 4.65 2 of 4 BDL 12.5 1,162 SULFATE 2005.74 4 of 4 1900 2120 501,054 TOTAL DISSOLVED SOLIDS 27760.50 4 of 4 27000 29300 6,934,851 TOTAL KJELDAHL NITROGEN 0.39 4 of 4 0.28 0.58 97 TOTAL ORGANIC CARBON (TOC) 28.98 4 of 4 21 40 7,239

TOTAL PHOSPHOROUS 0.06 3 of 4 BDL 0.34 15 TOTAL SULFIDE (IODOMETRIC) 3.94 4 of 4 3 5 984 TOTAL SUSPENDED SOLIDS 9.62 4 of 4 4 18 2,403 VOLATILE RESIDUE 2506.27 4 of 4 1910 3160 626,091 Hydrazine (mg/L) HYDRAZINE 0.08 4 of 4 0.0705 0.089 20 Mercury (ng/L) MERCURY 0.60 3 of 4 BDL 0.835 0.0001 Metals ( μ g/L) ALUMINUM Dissolved 52.03 2 of 4 BDL 120 13 Total 37.00 1 of 4 BDL 135.5 9 BARIUM Dissolved 11.44 4 of 4 10.35 12 3 Total 11.24 4 of 4 10.25 11.8 3 BORON Dissolved 3098.77 4 of 4 2990 3220 774 Total 3060.48 4 of 4 2990 3175 765 CALCIUM Dissolved 256841.05 4 of 4 203000 292000 64,161 Total 291451.71 4 of 4 286000 299000 72,808 COPPER Total 53.37 4 of 4 43.7 86 13 IRON Dissolved 99.76 4 of 4 37.45 159 25 Total 130.50 4 of 4 74.95 202 33 MAGNESIUM Dissolved 907229.15 4 of 4 881000 923500 226,635 Total 938389.79 4 of 4 907000 1024500 234,419 MANGANESE Dissolved 12.13 4 of 4 11.15 13.7 3 Total 12.13 4 of 4 10.7 13.7 3 NICKEL Dissolved 184.65 4 of 4 137 263.5 46 Total 189.72 4 of 4 144 267.5 47 SILVER Dissolved 3.07 1 of 4 BDL 5.68 1 SODIUM Dissolved 8225693.86 4 of 4 8040000 8450000 2,054,861 Total 8039337.04 4 of 4 7740000 8550000 2,008,307

### Compensated Fuel Ballast 16 THALLIUM Dissolved 5.61 1 of 4 BDL 10.8 1 Total 7.40 1 of 4 BDL 24 2 ZINC Dissolved 1220.18 4 of 4 173 4330 305 Total 4256.14 4 of 4 3840 4845 1,063

Organics ( μ g/L) 2,3-DICHLOROANILINE 6.09 1 of 4 BDL 11 2 2,4-DIMETHYLPHENOL 312.10 4 of 4 180 430 78 2-METHYLBENZOTHIOAZOLE 8.07 1 of 4 BDL 34 2 2-METHYLNAPHTHALENE 61.34 4 of 4 58 63 15 2-PROPANONE 41.18 2 of 4 BDL 73 10 2-PROPENAL 42.20 1 of 4 BDL 203 11 4-CHLORO-2-NITROANILINE 12.04 1 of 4 BDL 21 3 ACETOPHENONE 21.99 4 of 4 21 23 5 ANILINE 6.58 1 of 4 BDL 15 2 BENZENE 89.99 4 of 4 31 153 22 BENZOIC ACID 75.62 3 of 4 BDL 146 19 BENZYL ALCOHOL 12.16 3 of 4 BDL 24 3 BIPHENYL 9.76 4 of 4 7.5 11 2 ETHYLBENZENE 38.59 4 of 4 20.5 59 10 HEXANOIC ACID 16.93 4 of 4 7.5 28 4 ISOSAFROLE 6.69 1 of 4 BDL 16 2 LONGIFOLENE 54.02 1 of 4 BDL 545 13 M-XYLENE 58.13 4 of 4 41.5 73 15 N-DECANE 7.28 1 of 4 BDL 22.5 2 N-DOCOSANE 7.11 1 of 4 BDL 20.5 2 N-DODECANE 10.01 2 of 4 BDL 36.5 3 N-EICOSANE 20.35 4 of 4 14 51 5 N-HEXADECANE 39.36 4 of 4 26 99.5 10 N-OCTADECANE 24.98 4 of 4 16 64 6 N-TETRADECANE 21.19 4 of 4 14 60 5 NAPHTHALENE 19.54 3 of 4 BDL 47 5 O+P XYLENE 100.66 4 of 4 71 127 25 O-CRESOL 181.10 4 of 4 84.5 296 45 O-TOLUIDINE 40.24 4 of 4 8 95 10 P-CRESOL 110.73 4 of 4 46.5 192 28 P-CYMENE 5.53 1 of 4 BDL 10 1 PHENOL 69.70 4 of 4 59 83 17 THIOACETAMIDE 19.75 1 of 4 BDL 152 5 TOLUENE 164.46 4 of 4 63.5 269 41 TOLUENE,2,4,-DIAMINO- 72.44 1 of 4 BDL 227 18 Log normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., "non-detect" samples), estimated analyte concentrations equivalent to one-half of the detection levels were used to calculate the mean. For example, if a "non-detect" sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the log normal mean calculation.

### Compensated Fuel Ballast 17 Table 3. Estimated Total U.S. In-port Discharge of Compensated Ballast

(millions of gallons/year Fleetwide)

Ship Class Number of Ships Total In-port Discharge CG 47 25 10.0 DD 963 28 11.2 DD 993 4 1.6 DDG 51 18 7.2

Table 4. Estimated Annual Mass Loadings of Constituents

Constituent Log Normal Frequency of Minimum Maximum Mass Loading Mean Detection Concentration Concentration (lbs/yr)

Classicals (mg/L) Ammonia As Nitrogen 0.26 4 of 4 0.19 0.3 65

Hexane Extractable Material 12.73 4 of 4 8 36.5 3,180

Nitrate/ Nitrite - - - - - Total Kjeldahl Nitrogen 0.39 4 of 4 0.28 0.58 97

Total Nitrogen a 0.39 4 of 4 0.28 0.58 97 Total Phosphorous 0.06 3 of 4 BDL 0.34 15

Mercury (ng/L) Mercury* 0.6 3 of 4 BDL 0.835 0.00015 Metals ( μ g/L) Copper Total 53.37 4 of 4 43.7 86 13 Nickel Dissolved 184.65 4 of 4 137 263.5 46

Total 189.72 4 of 4 144 267.5 47 Silver Dissolved 3.07 1 of 4 BDL 5.68 0.77 Thallium Total 7.40 1 of 4 BDL 24 2 Zinc Dissolved 1220.18 4 of 4 173 4330 305

Total 4256.14 4 of 4 3840 4845 1,063 Organics ( μ g/L) 2-Propenal 42.2 1 of 4 BDL 203 10 Benzene 89.99 4 of 4 31 153 22 * - Mercury was not found in excess of WQC; mass loading is shown only because it is a bioaccumulator. A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Compensated Fuel Ballast 18 Table 5. Estimated Mass Loadings by Homeport (lbs/yr)

Total Everett Mayport Norfolk Pascagoula Pearl Harbor San Diego Ships 75 4 13 27 2 10 19 Loading Ranges HEM 3180 170 551 1145 85 424 805 SGT-HEM 1160 62 201 417 31 155 294 Copper 13.3 0.7 2.3 4.75 0.35 1.8 3.4 Nickel 47.4 2.5 8.25 17.1 1.25 6.3 12 Zinc 1063 56.7 184.25 382.7 28.35 141.7 269.3 Thallium 2 0.11 0.35 0.72 0.05 0.27 0.51 Silver 0.77 0.04 0.135 0.285 0.02 0.1 0.19 2-Propenal 10.3 0.55 1.8 3.7 0.28 1.4 2.6 Ammonia 65 3.5 11.3 23.4 1.75 8.7 16.5 Benzene 22 1.2 3.8 7.9 0.6 2.9 5.6 Nitrogen 97 1.7 17 35 0.84 13 25 Phosphorous 15 0.8 2.6 5.4 0.4 2.0 3.8

### Compensated Fuel Ballast 19 Table 6. Mean Concentrations of Constituents Exceeding Water Quality Criteria

Constituent Log Normal Mean Minimum

Concentration Maximum

Concentration Federal Acute

WQC Most Stringent

State Acute WQC Classicals (mg/L) Ammonia As Nitrogen 0.26 0.19 0.3 None 0.006 (HI) A

Nitrate/Nitrite

- - - Total Kjeldahl Nitrogen 0.39 0.28 0.58 None

- Total Nitrogen B 0.39 0.28 0.58 None 0.2 (HI) A Hexane Extractable Material 12.73 8 36.5 visible sheen a / 15 b 5 (FL)

Total Phosphorous 0.06 BDL 0.34 None 0.025 (HI) A Mercury (ng/L) Mercury* 0.6 BDL 0.835 1800 25 (FL, GA) Metals ( μ g/L) Copper Total 53.37 43.7 86 2.9 2.5 (WA) Nickel Dissolved 184.65 137 263.5 74 74 (CA, CT)

Total 189.72 144 267.5 74.6 8.3 (FL, GA) Silver Dissolved 3.07 BDL 5.68 1.9 1.9 (CA, MS) Thallium Total 7.40 BDL 24 None 6.3 (FL) Zinc Dissolved 1220 173 4330 90 90 (CA, CT, MS)

Total 4256 3840 4845 95.1 84.6 (WA) Organics ( μ g/L) 2-Propenal 42.2 BDL 203 None 18 (HI) Benzene 89.99 31 153 None 71.28 (FL) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen. * - Mercury was not found in excess of WQC; concentration is shown only because it is a bioaccumulator.

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

a Discharge of Oil , 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. b International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS)

### Compensated Fuel Ballast 20 Table 7. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation Data call responses X

2.2 Releases to the Environment Data call responses X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality Data call responses X 3.2 Rate Data call responses X 3.3 Constituents Data call responses X X 3.4 Concentrations Data call responses X X 4.1 Mass Loadings X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X

### Controllable Pitch Propeller Hydraulic Oil 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as candidates for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Controllable Pitch Propeller Hydraulic Oil

### Controllable Pitch Propeller Hydraulic Oil 2 2.0 DISCHARGE DESCRIPTION
This section describes the controllable pitch propeller (CPP) hydraulic oil discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
CPPs are used to control vessel speed and direction without changing the speed or direction of the vessel’s main propulsion plant shafting. With CPPs, the angle of the propeller blades (pitch) is variable, which affects the “bite” that the blade has on the water. This allows the amount of water displaced in the forward or reverse directions to be varied, which changes the forward and reverse speed of the vessel.
The pitch of the CPP blades is controlled hydraulically through a system consisting of a pump, piston, crosshead, and blade crank rings. The piston, crosshead, and crank rings are located in the propeller hub. High pressure hydraulic oil, acting on either side of the piston, moves the piston axially within the propeller hub. The piston is attached to a piston rod that connects to the crosshead that moves axially with the piston. Sliding blocks fit in machined slots on the crosshead and these sliding blocks fit over eccentrically-located pins mounted on the crank pin rings. As the crosshead moves forward and backwards within the hub, the sliding blocks move in an arc that also moves the eccentric pin and rotates the crank pin rings to which the CPP blades are bolted. 1



### High-pressure hydraulic control oil is provided to each propeller by a hydraulic oil pressure module (HOPM). While operating, the HOPM supplies oil pressure at 400 pounds per square inch (psi) to control the CPP. While a vessel is pierside, the HOPM is idle and the pressure to the CPP consists of approximately 6 to 8 psi provided by 16 to 21 feet of hydraulic head, depending on the vessel class, from a 40- to 65-gallon reservoir that supplies head to a larger sump tank (600 to 800 gallons) for the CPP system. Several rubber O-ring seals, along with the finely machined surfaces of the blade port cover, the bearing ring, and the crank pin ring, keep the hydraulic oil inside the CPP hub and away from the water.
Figures 1 through 3 show cross sections and a top view of a CPP. Figure 4 is a block diagram of a CPP system.

2.2 Releases to the Environment
The hydraulic oil can be released under three conditions from a CPP and CPP maintenance tools: leaks past CPP seals; releases during underwater CPP repair and maintenance activities; and release of power head tool hydraulic oil during CPP blade replacement. Small quantities of oil can leak past the CPP seals if they are old, worn, or defective.

### Controllable Pitch Propeller Hydraulic Oil 3 Oil can also be released to the environment during the underwater maintenance of CPP propeller blades or seals. 2 

### Underwater maintenance is performed to: 1) replace seals or center blade post sleeves; or 2) replace one or more propeller blades. The procedures for performing underwater replacements are detailed in reference (2). The detailed information in the following subsections applies to Navy vessels. Data on Military Sealift Command (MSC) underwater replacements are unavailable, and the U.S. Coast Guard (USCG) performs replacements only in dry dock. 3,4



### Blade Port Cover Removal. Approximately five to seven of the estimated thirty underwater replacements per year fleetwide are to remove blade port covers for maintenance and can cause some hydraulic oil to be released from the CPP hub. 5 

### The CPP hub seals or center post sleeve are replaced when observations or inspections indicate failure or cracking. 6 

### To change hub seals or the center post sleeve, the CPP blade is removed to access the blade port cover, which, in turn, must be removed to access the seals and center post sleeve. The underwater husbandry manual for the underwater change outs also references “NAVSEA Best Management Practices (BMPs) to Prevent/Mitigate Oil Spills Related to Waterborne Removal(s) of Blades on Variable Pitch Propellers for Naval Vessels.” This BMP is described in Section 3.2.2.
CPP Blade Replacement. CPP blade replacement normally occurs after a casualty that causes blade damage (e.g., running aground, hitting a submerged object). During blade replacements, a CPP blade is unbolted from the blade port cover and replaced (see Figure 1). Removing a CPP blade does not, in itself, cause hydraulic oil to be released from the CPP hub assembly (other than that released by the bleeding procedure described above). Seals, bearings, and sleeves are still in place to prevent any oil from being released.
During CPP blade replacement, the blade is rotated to the 12 o’clock position to remove the Morgrip bolts that secure the blade to the CPP hub. 6 

### The Morgrip bolts are removed with a hydraulic power head tool. Before the power head tool is used, it is bled of air underwater while attached to the Morgrip bolt by allowing oil to flow from a port until a “steady stream of hydraulic fluid (no air) bleeds from the loosened port opposite the HP tube in the power head.” 6



### 2.3 Vessels Producing the Discharge
The Navy, MSC and USCG operate vessels equipped with CPPs. The Army and Air Force do not operate any vessels equipped with CPPs. Table 1 lists the vessels that have CPPs and the number of shafts (i.e., number of CPPs, per vessel).

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 provides concentrations of the constituents in the discharge.

### Controllable Pitch Propeller Hydraulic Oil 4 3.1 Locality
Leaks of hydraulic oil past seals can occur at sea or within 12 n.m. of shore. Discharge underway is more likely than while pierside or at anchor because the CPP system is operating under a higher pressure.
Hydraulic oil can be d ischarged within 12 n.m. of shore during CPP repairs. The replacements are performed in port and are conducted on an as-needed basis when dry-docking is not scheduled for a vessel or is impractical.

3.2 Rate
The rate of oil release from CPPs will vary with the activity performed on the CPP. The leakage rate from CPP seals is expected to be negligible while the release of oil from CPP blade replacement will be larger. The release of oil from the underwater replacement of CPP seals will generate more oil than the underwater replacement of CPP blades only. The following paragraphs provide further information related to the anticipated release rates from CPPs.

3.2.1 Leaks From CPP Seals
The systems that monitor hydraulic oil loss can detect catastrophic failures on the order of 5 to 250 gallons over 12 hours, but not small leaks. The internal pressure in the CPP hub is approximately 6 to 8 psi, depending on the vessel class, when the HOPM is not operating (e.g., while a vessel is pierside). The external pressure from the seawater is approximately 5.8 to 8 psi provided by 13 to 18 feet of seawater, depending on the vessel class. Therefore, the pressure differential between the hydraulic oil in the CPP and the seawater is low (e.g., 1 psi or less) and provides little driving force to force oil from the CPP hub. Leakage rates under these conditions constitute seal failures requiring repairs/replacement considering that CPP hubs are designed to operate at 400 psi without leakage. CPPs are pressure tested at 400 psi prior to ship delivery and during dry dock maintenance. The CPPs are inspected quarterly for damage and signs of failure or excessive wear. 7 

### CPP seals are designed to last five to seven years and are reported to last their projected life. 7,8 

### Most Navy vessels equipped with CPPs have dry-dock cycles of approximately five years and MSC vessels have dry-dock cycles of two to three years. 3,9,10 

### During the dry dock cycle, the CPP is removed and shipped back to the manufacturer for inspection and maintenance, which includes replacement of the CPP seals. Based on the above information, the release rate of hydraulic oil from CPPs under normal operating conditions is expected to be negligible.

3.2.2 Underwater Replacements
Approximately thirty underwater CPP blade replacements occur per year, and five to seven of these include blade port cover removal to access the seal or center post sleeve for replacement. 5



### CPP Blade Port Cover Removal. According to Reference No. 2, as much as five

### Controllable Pitch Propeller Hydraulic Oil 5 gallons of oil could be present in CPP hub cavities. 2 

### It is unlikely that all of this oil is released during a seal replacement because the hub cavity opening is required to be oriented to the 6 o’clock position; the hydraulic oil is buoyant and floats within the hub cavity, effectively trapping the oil. 6



### Oil (0 to 5 gallons) could be released when oil is supplied to the assembly to displace water before replacing the blade port cover. 6 

### After the seals or the center post sleeve are replaced, head pressure is applied from the head tank to force out any water that entered the hub. The husbandry manual does not specify if oil is discharged when displacing water in the hub, but it appears to be a reasonable probability. The blade port cover is then replaced, and the hub is pressure tested at 20 psi. Leaks can appear if the seals are not properly seated, the mylar shims (i.e., spacers) are not the proper thickness, or the bearing ring is worn. 6 

### If the bearing ring requires replacement the vessel must be put in a dry dock.
Small amounts of oil can be discharged when removing and replacing the seal, bearing ring, blade seal base ring, and center post sleeve. Assuming the worst-case condition, five gallons of oil are discharged from the CPP hub during each replacement. At most a total of 35 gallons of hydraulic oil could be discharged annually fleetwide based on an average of seven replacements per year.
The BMP also requires the following precautionary measures:

a. Establish/install a floating oil boom in the vicinity of the work. Position this boom to enclose the aft one-third of the vessel, with approximately 20 feet beyond the stern to ensure that escaping oil is contained. 11



### b. Ensure that the oil recovery kit and personnel, who are trained in oil spill recovery, are at the work site at all times during the propeller blade removal/ installation to respond to any oil spill. The spill kit shall include a boom, absorbent pads, and other materials that remove oil from water. 11



### c. Any released oil will be captured within the oil boom and subsequently removed by the oil recovery team on the surface. A vacuum truck, equipped with a noncollapsible hose, will be at the site to remove any visible oil on the surface. 11



### CPP Blade Replacement. For the replacement of a CPP blade, the only source of oil release is from bleeding the Morgrip bolt power head tool. Each blade replacement results in approximately twenty ounces of hydraulic oil bled from the power tool (e.g., 10 ounces for the blade removal and 10 ounces for the blade replacement). 12 

### For the estimated 30 replacements that occur each year, this translates to approximately 600 ounces (4.7 gallons) of hydraulic oil bled from power head tools.

3.3 Constituents
The expected constituents of the discharge are 2190 TEP hydraulic oil from the CPP and

### Controllable Pitch Propeller Hydraulic Oil 6 the hydraulic oil (e.g., Tellus #10) that is bled from the power head tool. Constituents of the oil vary by manufacturer and are noted in Table 2. Hydraulic oils contain C 17 

### (heptadecane, heptadecene) and large paraffins and olefins. 13 

### The 2190 TEP oil can also contain up to 1% tricresylphosphate (TCP) as an antiwear additive. 14 

### Shell Oil Tellus Oil #10 (Code 65203) hydraulic oil contains solvent-refined, hydrotreated middle distillates and light hydrotreated naphthenic distillates. 15 

### CPP hydraulic oil can contain copper, tin, aluminum, nickel, and lead that are leached from the piping, hub, and propeller.
Copper, nickel, and lead are priority pollutants that could be present in the hydraulic oil. There are no known bioaccumulators in this discharge.

3.4 Concentrations
The released material is expected to be hydraulic oil with metals such as copper, tin, aluminum, nickel, and lead from the piping, hub, and propeller. These metal constituents are expected to be in low concentrations because metals have low corrosion rates when in contact with oil. In addition, the hydraulic oil is continually processed through a filtration system to prevent particulate matter and water from entering the CPP system and potentially causing system failures.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings

4.1.1 Leaks From CPP Seals

As discussed in Section 3.2.1, the release rate of oil from CPP seals due to normal operations is expected to be negligible. CPPs are designed not to leak and are tested prior to delivery at 400 psi. In addition, the CPPs are inspected quarterly. 7 

### The majority of those vessels equipped with CPPs have dry-dock cycles of five years or less and CPPs are returned to the manufacturer for inspection and overhaul during the dry dock period. 3,7,9,10 

### Therefore, the mass loading for oil leakage from CPPs is expected to be negligible.

4.1.2 Underwater Replacements
As estimated in Section 3.2.2, Armed Forces vessels could release up to 4.7 gallons of hydraulic oil from the Morgrip tool and 35 gallons of hydraulic oil from blade port cover removals each year. This quantity of oil has a mass of approximately 290 pounds based on a

### Controllable Pitch Propeller Hydraulic Oil 7 specific gravity of 0.88 for the hydraulic oil.

4.2 Environmental Concentrations
The quantities of hydraulic oil released can cause a sheen on receiving waters that violate federal and state “no sheen” standards. The metal constituents (e.g., copper, tin, nickel, and lead) in the oil can also be toxic, but it is anticipated that the concentrations, when dissolved in water, will be below toxicity thresholds. Florida has a water quality criterion for oil and grease of 5 milligrams per liter (mg/L) that the estimated environmental concentration for underwater replacement exceeds.

4.2.1 Leaks From CPP Seals

Because the release of oil from a CPP under routine operations is negligible, the resulting environmental concentration is negligible.

4.2.2 Underwater Replacements
The underwater replacements are expected to result in periodic, batch releases of hydraulic oil. Based upon the estimated release rates given in Section 3.2.2, the estimated discharge volume during each replacement is five gallons. During a typical underwater replacement requiring the removal of the port blade cover, the aft third of a vessel plus an additional 20 feet are enclosed with an oil boom. The Navy vessels having CPPs are between 445 and 567 feet in length and between 45 and 67 feet in beam (i.e., width). The average boomed length is approximately 190 feet and width of approximately 65 feet (e.g., average beam of 55 feet plus an estimated 10 feet for proper deployment). The quantity of oil released from CPPs during underwater replacements will result in free-phase oil that will result in localized visible oil sheens on the surface of the water. The resulting visible oil sheens are prohibited releases of oil under the Discharge of Oil (40CFR110) regulations of the Federal Water Pollution Control Act.

4.3 Potential for Introducing Non-Indigenous Species
CPPs do not transport seawater; there is no potential for transporting non-indigenous species.

5.0 CONCLUSIONS

5.1 Leaks From CPP Seals
The release of oil from CPPs during normal operation due to seal leakage is expected to be negligible. This is due to the following:
1) CPPs are designed not t o leak at 400 pounds per square inch (psi) when new or

### Controllable Pitch Propeller Hydraulic Oil 8 overhauled and are tested at 400 psi for leaks prior to delivery. There is a zero-leakage tolerance under the 400 psi test.
2) CPP seals are designed with service lives of 5 to 7 years and leakage that can occur due to wear or age occurs late within this operational life. The majority of vessels equipped with CPPs have dry-docking cycles for overhauls of approximately 5 years such that the releases occurring toward the end of the operational life of a CPP seal are avoided.
3) CPPs are inspected quarterly for damage and evidence of system failure (e.g., leaking seals).
The amount of oil leakage of CPPs under routine operating conditions has a low potential to cause an adverse environmental effect.

5.2 Underwater Replacements
CPP hydraulic oil discharge has the potential for causing adverse environmental effects during underwater replacements because:
1) oil is released to receiving waters by the equipment used to perform the underwater replacements, and
2) oil is released from the CPP hub assembly during underwater removals of the CPP blade port covers.
Releases due to underwater replacements are periodic and occur approximately thirty times per year. Those replacements that require the removal of the blade port cover release sufficient oil to cause a visible oil sheen on receiving waters and also exceed state WQC. These releases from waterborne CPP repairs are controlled using NAVSEA BMPs that reduce the adverse effects of the oil releases to receiving waters.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information and assumptions were used to estimate the rate of discharge. The resulting
environmental oil and grease concentrations were then estimated. Table 3 shows the sources of data used to develop this NOD report.
Specific References

1. Blank, David A.; Arthur E. Block; and David J. Richardson. Introduction to Naval Engineering, 2nd Edition . Naval Institute Press, 1985.

### Controllable Pitch Propeller Hydraulic Oil 9 2. John Rosner, NAVSEA 00C. Frequency of Underwater CPP Blade Replacements. December 1996, Gordon Smith (NAVSEA 03L1).

3. Penny Weersing, Military Sealift Command. Controllable Pitch Propeller (CPP) Hydraulic Seals for MSC Ships. April 1997.

4. LT Joyce Aivalotis, USCG. Response to Action Item RT11, May 28, 1997, David Ciscon, M. Rosenblatt & Son, Inc.

5. John Rosner, NAVSEA 00C. Meeting on Underwater CPP Blade Replacements. April 14, 1997, Clarkson Meredith, Versar, Inc., and David Eaton, M. Rosenblatt & Son, Inc.

6. Naval Sea Systems Command. Underwater Hull Husbandry Manual, Chapter 12, Controllable Pitch Propellers. S0600-PRO-1200. February 1997.

7. Harvey Kuhn, NAVSSES. Personal Communication, March 13, 1997, Jim O’Keefe, M. Rosenblatt & Son, Inc.

8. UNDS Equipment Expert Meeting Minutes. CPP Hydraulic Oil. September 26, 1996.

9. William Berberich, NAVSEA 03Z51. Prepared Responses to UNDS Questionnaire, UNDS Equipment Expert Meeting. September 26, 1996.

10. William Berberich, NAVSEA 03Z51. Response to CPP Hydraulic Oil Questions, March 28, 1997, Clarkson Meredith, Versar, Inc.

11. Naval Sea Systems Command. NAVSEA Best Management Practices (BMP) to Prevent/Mitigate Oil Spills Related to Waterborne Removal(s) of Blades on Variable Pitch Propellers for Naval Vessels. Undated.

12. John Rosner, NAVSEA 00C. Morgrip Power Head Purge During CPP Replacements, June 6, 1997, David Eaton, M. Rosenblatt & Son, Inc.

13. Patty's Industrial Hygiene and Toxicology, 3rd Edition. George D. and Florence E. Clayton, Ed. John Wiley & Sons: New York, 1981.

14. Military Specification MIL-L-17331H, Lubricating Oil, Steam Turbine and Gear, Moderate Service. November 19, 1985.

15. Shell Oil Company. MSDS for Tellus Oil #10, Code 65203. August 1988.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.

### Controllable Pitch Propeller Hydraulic Oil 10 USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Controllable Pitch Propeller Hydraulic Oil 11 Figure 1. Cross Section of a CPP

### Controllable Pitch Propeller Hydraulic Oil 12 Figure 2. Top View of a CPP Blade

### Controllable Pitch Propeller Hydraulic Oil 13 Figure 3. Cross Section of a CPP Blade Port Assembly

### Controllable Pitch Propeller Hydraulic Oil 14 Figure 4. Block Diagram of a CPP System

### Controllable Pitch Propeller Hydraulic Oil 15 Table 1. Armed Forces Vessels with CPP Systems

Vessel Class Description Vessel Shafts

Navy: CG 47 Ticonderoga Class Guided Missile Cruiser 27 2 DD 963 Spruance Class Destroyers 31 2 DDG 51 Arleigh Burke Class Guided Missile Destroyers 19 2 DDG 993 Kidd Class Guided Missile Destroyers 4 2 FFG 7 Oliver Hazard Perry Guided Missile Destroyers 43 1 LSD 41 Whidbey Island Class Dock Landing Ships 8 2 LSD 49 Harpers Ferry Class Dock Landing Ships 3 2 MCM 1 Avenger Class Mine Counter Measures Ship 14 2 Total: 149

MSC: T-AO 187 Henry J. Kaiser Class Oilers 13 2 T-ATF 166 Powhatan Class Fleet Ocean Tugs 7 2 Total: 20

USCG: WHEC 715 Hamilton and Hero Class High Endurance Cutters 12 2 WMEC 901 Famous Class Medium Endurance Cutters 13 2 WMEC 615 Reliance Class Medium Endurance Cutters 16 2 WAGB 10 Polar Class Icebreakers 2 3 Total: 43

Total Armed Forces Vessels with CPP: 212

### Controllable Pitch Propeller Hydraulic Oil 16 Table 2. Percentages of Constituents, TEP 2190 Oil and Tellus Hydraulic Oil

Constituent MIL-L-17331H

Turbine Oil 2190 Chevron Oil

MSDS Turbine Oil 2190 Mobil Oil

MSDS Turbine Oil 2190 Shell Oil MSDS

Tellus Oil #10

Virgin Petroleum Lubricating Oil (a) Balance

Tricresyl Phosphate (TCP) ≤ 1%

Additives ≤ 0.5% Unknown Formaldehyde < 1%
Hydrotreated Heavy Paraffinic Distillates > 99% > 95%

Solvent-Dewaxed Heavy Petroleum Distillates < 1%

Hydrotreated Middle Distillate 0 - 100%

Hydrotreated Light Naphthenic Distillate 0 - 100%

(a) Virgin Petroleum Lubricating Oil is all classes of lubricating oil including heavy and middle Paraffinic distillates, solvent-dewaxed heavy distillates, light naphthenic distillates, etc.



### Table 3. Data Sources

Data Sources NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database, Jane’s, Navy Home Page, USCG Cutters List X

3.1 Locality X 3.2 Rate X 3.3 Constituents MSDSs, Mil Specs X 4.1 Mass Loadings X 4.2 Environmental Concentrations Federal and State Regs X4.3 Potential for Introducing NonIndigenous Species X

### Deck Runoff 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Deck Runoff

### Deck Runoff 2 2.0 DISC HARGE DESCRIPTION
This section describes the deck runoff discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).
Decks are addressed in this NOD report under three categories: weather decks, aircraft flight decks, and oiler weather decks. The runoff from each deck type reflects the materials and treatment to which it is exposed during normal operations. All decks are exposed to a similar and harsh environment; however, there is a core group of activities, weapons, and machinery common to all ships. These common elements are addressed under the general category of weather deck runoff. Runoff from flight decks from which aircraft are launched and recovered and from oiler weather decks are addressed separately since the unique nature of the operations conducted on these decks distinguishes them from other weather deck surfaces.

2.1 Equipment Description and Operation

2.1.1 Weather Deck Runoff
Weather deck runoff consists of rain and other precipitation, seawater which washes over the decks (green water), and freshwater washdowns. Precipitation is usually the primary source within 12 nautical miles (n.m.) of shore. Except for small craft, green water or salt spray over the deck occurs primarily at sea and does not contribute to deck runoff while a ship is in port or in protected coastal waters. Freshwater washdowns also occur, but contribute less to weather deck runoff than precipitation.
The following paragraphs summarize each source that can contribute components to weather deck runoff. 1



### Deck Machinery - Ships have many pieces of deck machinery, such as windlasses, mooring winches, boat winches, underway replenishment gear, cranes, towing winches, and stern gates. This equipment is maintained with a variety of materials, including lubricating oils and greases that may be present in the deck runoff.
Topside Debris - Debris is trash (e.g., cigarette butts, dirt, paper) that can be washed overboard. The amount of debris is almost entirely a function of housekeeping practices, and crew discipline determines how much is collected for disposal instead of being washed overboard.
Wire Rope - Wire rope is used extensively in topside rigging, deck machinery, replenishment gear, and other equipment. It must be lubricated to prevent premature failure caused by friction between strands as the rope is worked. The lubricating oil or grease must be thin enough to flow or be worked between individual strands, but sufficiently wash-resistant to withstand rain and washdowns.

### Deck Runoff 3 Fueling Operations - Fueling operations, either at sea or in port, may contaminate the deck with petroleum hydrocarbons (e.g., diesel, JP-5, fuel oil).
Weapons Systems - Gun mounts, missile launchers, weapons directors, and other weapons-related equipment can contribute constituents similar to those of deck machinery; however, they are less likely to contribute to deck runoff because most are contained in a turret or other water-tight or water-resistant enclosure.
Ship’s Boats - Surface ships have small boats (e.g., punts, landing craft, rigid inflatable boats [RIBs]) that are stored topside. They have bilge plugs that are removed while stored, to drain rainwater, washdown water, or green water through their bilge and onto the deck if the boats are not properly covered. Constituents in the bilge (primarily diesel fuel) are discharged with the water.

Soot Particles - Burned fuels can leave fine soot particles on the deck. Except for MSC ships that are powered in equal numbers by steam and diesel propulsion equipment, the majority of the Armed Forces’ surface ships and craft have diesel or gas turbine propulsion and use clean-burning distillates to minimize soot. However, significant amounts of soot can be produced during boiler light-off or after prolonged shutdowns of turbines and diesels.
Firefighting Agents - Aqueous Film Forming Foam (AFFF) firefighting systems are tested periodically in accordance with the planned maintenance system (PMS). These tests are conducted beyond 12 n.m. or while making 12 knots or more when transiting between 3 and 12 n.m.. The AFFF must be collected if the exercise occurs within 3 n.m. As discussed in the AFFF NOD report, AFFF is not discharged overboard within 3 n.m. of shore except in the rare instance of an actual shipboard fire.
Cleaning Solvents and Detergents - Miscellaneous solvents are used to clean and maintain topside equipment. These solvents may contain chlorinated compounds. However, they are also volatile and evaporate quickly. As such, their presence in deck runoff is expected to be minimal to nonexistent. During freshwater washdowns, crew members may use detergents that become part of the runoff.

Some or all of the above-listed sources that contribute to the contamination in deck runoff are common to all vessels.
Various Navy ports treat weather deck runoff differently. To date, no port is known to require the containment of rainwater runoff; however, a containment requirement may exist for some freshwater washdowns in certain Navy ports. For instance, at the Naval Submarine Base, Bangor, WA, freshwater washdowns containing cleaning agents, detergents, or other additives are considered to be industrial discharges; and, as such are not permitted to be discharged into the Hood Canal, rated a class AA “extraordinary” water body. 2 

### On the other hand, low-pressure freshwater washdowns completely free of cleaning agents or other chemicals need not be contained, and may be discharged into the Hood Canal. 2

### Deck Runoff 4 The U.S. Coast Guard (USCG) performs washdowns of its ships after returning to port and weekly while in port. 3 

### Initially, the decks are cleared of debris by hand and/or vacuum and then scrubbed with fresh water and detergent using brushes and screening pads. Fresh water is used to rinse the washdown overboard. 3



### Deck runoff occurs on boats and craft although some, such as RIBs, are stored on land. Because these vessels are small, green water becomes a significant contributor to deck runoff, and freshwater washdowns occur more frequently to remove the effects of green water on these vessels compared to larger ships. Craft, such as mechanized landing craft (LCMs), and smaller boats, such as RIBs and river patrol boats (PBRs), are washed down frequently to remove saltwater spray and residues left by heavy equipment and troops. However, many of these craft have large wells and very little deck area, which reduces the amount of deck runoff. Instead, precipitation, washwater, and green water collect in the bilge, rather than contributing to deck runoff. The USCG washes down its smaller vessels (i.e., those less than 65 feet long) nearly every day. 3



### 2.1.2 Flight Deck Runoff
The same three sources of water contribute to this discharge as to that of weather deck runoff: precipitation, greenwater over the deck from heavy seas, and deck washdowns, in this case flight deck washdowns. As with weather deck runoff, flight deck runoff can be contaminated with a variety of chemicals.
Aircraft carrier launch and recovery equipment, e.g., catapult troughs and jet blast deflectors, are unique to aircraft carriers and are a major contributor of contaminants to flight deck runoff. Lubricating oil is applied to the catapult before each launch, and a fraction of this oil, along with the fuel mist emitted from aircraft during launch and hydraulic fluid and grease from the catapult, are deposited in the four catapult troughs of each carrier. 4-6 

### Most of these deposits drain overboard during flight operations, i.e., beyond 12 n.m., but a considerable amount of residual deposits can remain where precipitation can wash it overboard, either during transit or in port. 4-6 

### Oil sheens have been observed in port around aircraft carriers. This usually occurs following rainstorms due to runoff from the catapult troughs. In addition, the jet blast deflectors accumulate soot from jet exhaust, and have hydraulic system leakage that could contribute to flight deck runoff.
Most commissioned Navy vessels have flight decks for helicopter landing and takeoff. Many of these ships also have hangar facilities for helicopter storage and maintenance. The LHA, LHD, and LPH Classes of amphibious assault vessels have between 30 and 36 helicopters embarked, and some have about a dozen Vertical/Short Take-Off and Landing (VSTOL) aircraft as well. Flight exercises are conducted routinely with these aircraft.

Several other classes of vessels also have helicopter landing areas and hangars which accommodate one to three helicopters. These ships carry helicopters as part of their normal complement, but conduct flight operations less frequently than carriers or amphibious assault

### Deck Runoff 5 ships. Exceptions are the large service force ships, such as fast support ships (AOEs), ammunition ships (T-AEs), and combat stores ships (T-AFSs), which carry two or three UH-46 Sea Knight helicopters for underway replenishment (UNREP). These ships use the helicopters to transfer large volumes of provisions and ammunition rapidly during UNREP operations.
Vessels with ancillary helicopter flight decks and do not have their own helicopters, are not included in this analysis because they contribute very little helicopter-specific flight deck runoff compared to an amphibious assault vessel, which can carry up to 36 helicopters.
Flight deck washdowns to eliminate fire and slip hazards and to wash salt spray off flight decks are performed while ships are underway. 7,8 

### Both Commander Naval Air Force, U.S. Atlantic Fleet (COMNAVAIRLANT) and Commander Naval Air Force, U.S. Pacific Fleet (COMNAVAIRPAC) have promulgated policies that carrier flight decks are not to be washed down within 12 n.m. of shore except in cases of emergency. 7,8 

### Further, both Commander Naval Surface Force, U.S. Atlantic Fleet (COMNAVSURFLANT) and Commander Naval Surface Force, U.S. Pacific Fleet (COMNAVSURFPAC) have policies in force that state that decks shall not be washed within 12 n.m. of shore. 9,10



### Aircraft and helicopter freshwater washdowns are performed to remove dirt, hydrocarbons, salt deposits, and other materials resulting from flight operations or from salt spray. Unless the ship’s engineering officer is short of fresh water, the aircraft are washed before they disembark upon the ship’s return to port. Since current policies require that flight deck washing be completed prior to the ship arriving within 12 n.m. of shore, and since aircraft are disembarked prior to washing the flight deck, aircraft are not usually aboard either aircraft carriers or amphibious assault ships within 12 n.m. of shore. Therefore, aircraft freshwater washdowns do not contribute to deck runoff with 12 n.m. of shore. 11



### MSC has not promulgated protocols for the washing of helicopter flight decks on its vessels. The cleaning agent/solvent used and the washdown frequency are at the discretion of the officer in charge of the deck. Except in unusual circumstances, flight decks are not washed in port. 12



### 2.1.3 Oiler Weather Deck Runoff
Oilers carry various petroleum products as cargo. This report examines the discharge from Navy and MSC oilers and UNREP ships which perform fueling-at-sea (FAS) operations. It also examines the discharge from the fuel barge service craft, which are used to fuel and defuel surface vessels while in port.
During the receiving and off-loading of bulk fuel, oilers have the potential to discharge oil. To prevent this, the weather deck is sealed by plugging or blocking the weather deck openings as required by Federal Regulations. 13 

### If the liquid contains oil from inadvertent spills or releases, the liquid is processed through the ship’s oily waste treatment system. These ships are also provided with oil spill containment and cleanup kits.

### Deck Runoff 6 The newer oilers, such as the T-AO 187 Class, incorporate engineering design features and follow fueling practices that minimize oil releases. Excess oil and other uncontained liquids drain to a sludge collection tank, which is routed to an oily waste collection system. Any other liquid that collects in these sumps, such as rainwater or seawater, is also routed through the oily waste collection system. 14 

### The 7-inch fueling hoses contain check valves to prevent spills when disconnected. Additional protection against spills is provided by “blowing down” the hose with compressed air and/or taking a “back suction” with the cargo or stripping pumps and pumping the contents of the hose back to the oiler’s cargo reclamation system before disconnecting the hose. FAS stations are also provided with spill response equipment to contain one to six barrels of oil (42 to 252 gallons), and with sorbents to contain any drips or small spills.
The newer designs also include the required catchment basin around fuel tank vent stations to contain oil and other liquids released because of overfilling during fueling operations. 13 

### If the liquids contain oily residues, these basins are pumped to the oily waste collection system. If the catchment basin contains only rainwater, the rainwater is discharged overboard. The catchments are routinely cleaned to remove oily residue. The disposition of these wash waters is to the oily waste collection system. 14 

### The treatment and disposition of oily waste is covered in the Surface Vessel Bilgewater/OWS Discharge NOD report.
All fuel barges have fire and flooding alarms, and are equipped with high tank level alarms. Ship alterations have been prepared to install oil retaining coamings and plugs for all fuel barges. Most barges currently in use were built or retrofitted with the coamings. 15 

### Fuel oil barges refuel ships within 12 n.m. of shore, whereas the oilers/UNREP vessels refuel ships beyond 12 n.m.

2.2 Releases to the Environment
Deck runoff is produced when water falls on or is applied to the exposed surfaces, such as weather and flight decks, superstructure, bulkheads, and the hull above the waterline, of a ship. Frequently runoff is contaminated by residues from the activities described in Section 2.1. The probable contaminants include: oil and grease; petroleum hydrocarbons; surfactants; cleaners; glycols; solvents; and particulates, such as soot, dirt, or metallic particles.

2.3 Vessels Producing the Discharge
Deck runoff is produced on all ships, submarines, boats, and craft of the Armed Forces (Table 1). Table 1 lists ship class, number of ships homeported in the U.S., dimensions (length and beam), flight deck dimensions (where applicable), and the number of days annually that each class of ship averages within 12 n.m. 16 -25 

### The several thousand small boats and craft of the Armed Forces are not individually categorized.
Water, other than green water, that falls on the decks of submarines while they are in port or transiting inside of 12 n.m. is deck runoff. For submarines, green water is not considered deck runoff because of their design. All operating equipment on a submarine, with some minor exceptions, is contained within the double hull of the ship. Some outboard equipment, such as

### Deck Runoff 7 the hydroplanes, rudder, shaft seals, periscope, and antennae, are greased on a submarine; however, discharges from these sources are described in a separate NOD report. When operating, submarines spend virtually all of their time submerged beyond 12 n.m., and no activities are performed topside on a routine basis that could contribute to the contamination of deck runoff. Similarly, while submarines are in port, the majority of work occurs on the inside of the ship, not topside. Based on this information, the deck runoff from submarines is not a significant discharge.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
This discharge consists of runoff from rainfall and o ther precipitation, from freshwater washdowns, and from green water; therefore, it can occur while in port or at sea. Table 1 contains a tabulation of the number of days the various vessel types spend within 12 n.m. of shore. 16



### 3.2 Rate
The gallons of precipitation runoff per year estimated for each home port of a ship class is the product of the deck area of a ship in the class, the number of ships in the class in a given homeport, the average fraction of the year spent within 12 n.m. of shore, the average annual rainfall in the homeport, and the appropriate conversion factors. The total gallons of runoff from a ship class is the sum of the estimates thus developed for all the homeports of the class.

3.2.1 Weather Deck Runoff
Precipitation is expected to be the largest contributor to deck runoff in all types of vessels. Annual average precipitation data were obtained for the largest ports used by the Armed Forces as homeports: Norfolk and Little Creek, VA; San Diego, CA; Pearl Harbor, HI; Groton, CT; Mayport, FL; Ingleside, TX; and Bremerton, WA. 26 

### The average number of transits and days in port were developed for the years 1991 through 1995 for Navy and USCG ships. 16



### The various deck areas were estimated by multiplying the product of a vessel’s length and beam by a factor intended to account for the departure of the deck’s shape from a rectangle. In Table 1, those ship classes which are asterisked have a helicopter platform, but do not have a helicopter routinely embarked. The deck areas listed for these vessel classes include the area of the flight deck. For vessel classes whose helicopter platform dimensions are without an asterisk, such as the Spruance Class destroyers (DD 963), the deck area listed in Table 1 does not include

### Deck Runoff 8 the area of the helicopter platform.
The gallons per year precipitation runoff values listed in Tables 2 through 7 and in Tables 9a and 9b were all estimated using the same formula:

(N) (D/365)(A)(P)(PF)(FG) = Annual Runoff (gallons per year)

where N = the num ber of ships with the same deck area contributing to the annual runoff

D = the number of days per year each ship is within 12 n.m. of shore A = the area in square feet of the deck or flight deck under consideration P = the annual rainfall in inches PF = 1/12, the conversion factor - one foot per 12 inches FG = 7.48 gallons per cubic foot
Based upon this information and average deck area, an estimate of weather deck runoff from precipitation was developed for Navy ships by home port, and is presented in Table 2. Approximately 37.6 million gallons of weather deck runoff occurs annually from Navy surface ships in U.S. homeports due to rainfall.
To derive estimates of the precipitation-induced weather deck runoff from MSC, USCG, and Army vessels, a 40-inches-per-year rainfall was assumed, the annual average for the Navy homeports. The estimates are provided in Table 3. Approximately 54.6 million gallons of weather deck runoff occur annually within 12 n.m. of the U.S. coast from MSC, USCG, and Army vessels due to precipitation.
The Armed Forces operate literally thousands of boats and craft of a multitude of sizes throughout the offshore waters, harbors, and rivers of the U.S. Because neither the precise location of all of the boats and craft nor the mode of operation and storage at each location has been determined, it is impractical to estimate rates for these vessels.

3.2.2 Flight Deck Runoff
An estimate for aircraft carrier flight deck precipitation runoff is based upon reported average annual precipitation, the number of ships in each homeport, the flight deck area, and the number of days in port. Approximately 23.3 million gallons of weather deck runoff from aircraft carrier flight decks occur annually within 12 n.m. of the U.S. coast due to precipitation.
These results show that the quantity of aircraft carrier flight deck runoff varies significantly with geographical location. San Diego, CA, has the lowest average annual rainfall resulting in the least runoff. Although Norfolk, VA does not have the highest precipitation rate, it produces the highest amount of flight deck runoff because it is homeport to the most carriers. The data and results are presented in Table 4. Because it is not unusual for three carriers to be in Norfolk at the same time, and for summer storms to produce an inch of rain in a few hours, the

### Deck Runoff 9 three carriers, with a combined flight deck area of 690,000 ft 2 

### , will generate approximately 430,000 gallons of flight deck runoff for each inch of rain.

Of the 11 a mphibious assault vessels in service, 10 are stationed in U.S. ports, and are homeported either in Norfolk, VA, or San Diego, CA. The ships, by class, are divided evenly between these two ports. The mine countermeasures support ship USS Inchon (MCS 12) is a converted Iwo Jima Class LPH, and is homeported in Ingleside, TX. The estimated total annual helicopter flight deck runoff for these vessels due to precipitation is approximately 8.3 million gallons. Table 5 is a compilation of the data used to estimate the average annual deck runoff from these ships due to precipitation.
Table 6 lists flight deck runoff from Navy surface vessels, other than aircraft carriers and amphibious assault vessels, by U.S. homeport, number and location of vessels by class, and the average annual rainfall for each port. Based on this information, these ships generate an annual deck runoff of approximately 2.6 million gallons due to precipitation.
The estimate for precipitation runoff from helicopter flight decks of MSC and USCG surface ships is presented in Table 7. The estimate was derived from the areas of the flight decks, the average annual rainfall, and the number of days in port for each ship class. Based on this information, MSC and USCG surface ships generate an estimated annual deck runoff of 860 thousand gallons due to precipitation.
A volume of helicopter flight deck wash water generated by USCG vessels is estimated in Table 8. The volume used to wash and rinse a given flight deck area is considered to be the same as would be used on a Navy ship, that is, 30-gallons of a cleaning solution mix of MIL-C-85570, type II detergent, sodium metasilicate (anhydrous or pentahydrate), and freshwater will treat approximately 3,000 ft 2 

### of deck. The amount of water used to rinse the cleaning solution off of the deck is on the order of three to five times the volume of the cleaning solution used. Further, because the USCG washes weekly, the number of washes annually is estimated by dividing the number of days a vessel is within 12 n.m. of shore by seven. 3 

### Based upon these assumptions, USCG surface ships generate approximately 70 thousand gallons of helicopter flight deck wash water as compiled in Table 8.

3.2.3 Oiler Weather Deck Runoff
Estimates have been prepared, using the same methodology, for the deck runoff from Navy and MSC oilers due to precipitation. They are presented in Table 9a. Similar estimates were prepared for the various service craft, such as fuel barges, and are presented in Table 9b. As indicated in the tables, the estimated annual runoff from the oilers is approximately 8 million gallons, and from the various service craft approximately 8.9 million gallons.

3.2.4 Runoff Summary
Table 10 is a compilation of the runoff volumes associated with the various runoff sources and vessel types. As indicated in the table, the estimated annual runoff from vessels of

### Deck Runoff 10 the Armed Forces due to precipitation and the limited number of in-port washdowns is approximately 143.9 million gallons.

3.3 Constituen ts
The runoff from flight and other weather decks can contain a number of different constituents, including: JP-5, found in the runoff from aircraft carrier flight decks, helicopter flight decks, and the weather decks of support ships carrying JP-5 as cargo; diesel fuel marine, distillate fuel, or gasoline, from vessel fueling and refueling operations; various solids, such as soot, paint chips, dirt, and trash; glycol from the windshield washing system; hydraulic fluid leakage; metals from scrapes, gouges and corrosion; rubber from aircraft tires; and the residue from cleaners and solvents, particularly sodium metasilicate.
These materials contain short- and medium-length aliphatics, light and heavy aromatics, paraffins, olefins, surfactants, glycols, and metals. Some cleaning solvents can contain chlorinated compounds, such as tetrachloroethylene. These solvents quickly evaporate.
Analytical data are available for one element of aircraft carrier flight deck runoff: the runoff that flows through a catapult trough and is discharged overboard. This runoff was sampled in a study on the feasibility of using an oil/water separator to treat trough runoff. 27 

### The resulting data are not representative of the runoff from the entire flight deck of a carrier, only of runoff that is discharged from one of the catapult troughs. The aqueous phase of the catapult trough runoff was analyzed for:

• oil and grease,

• phenols, and

• metals (silver, cadmium, chromium, copper, nickel, and lead).
The four catapult troughs ar e located in close proximity to the aircraft fueling spots, and collect spilled JP-5. Lubricating oil is applied to a catapult before each shot. A fraction of this oil, along with fuel mist emitted from aircraft during launch, and hydraulic fluid and grease from the catapult is deposited in each of the four catapult troughs. 4-6 

### The concentrations originating in the catapult troughs can, therefore, be expected to exceed those for the flight deck runoff in general.
None of the constituents analyzed for a re bioaccumulators, and no bioaccumulators are anticipated in this discharge. The materials used on the decks of vessels do not contain the pesticides, herbicides, PCBs, or other chlorinated aromatic compounds that constitute bioaccumulators.
Of the constituents listed above, silver, cadmium, chromium, copper, nickel, lead, and phenols are priority pollutants.

3.4 Concentrations

### Deck Runoff 11 The laboratory data from an aircraft carrier catapult trough drain system are presented in Table 11. The data are the concentrations before processing the runoff through an oil/water separator, and are not representative of the runoff from the entire flight deck of an aircraft carrier. 27



### Constituent concentrations resulting from precipitation are expected to vary significantly with a number of factors. These include: time since the last rain or deck washing; the intensity and duration of the last rainfall; the season (which will effect glycol loading from deicing fluids); the ship’s adherence to good housekeeping practices; and the type, intensity, and duration of weather (high sea state and green water) and ship’s operations. For example, higher seas which result in more frequent green water runoffs and more frequent freshwater washdowns, both of which generally occur outside 12 n.m., will minimize the concentrations of accumulated residues that contribute to runoff contamination in port. Further, it should be noted that deck runoff from precipitation may mimic the constituent concentration patterns observed in storm water runoff from highways and parking lots: contaminant concentrations will be higher in first portions of the runoff, and then will taper off to low or nondetectable levels as the precipitation continues.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. A discussion of mass loadings is presented in Section 4.1. In Section 4.2, the concentrations of discharge constituentsare compared with the water quality standards. In Section 4.3, the potential for transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Currently, no basis exists for estimating the mass loadings of deck runoff accurately. The factors discussed in Section 3.4, that combine to produce the great variance in deck runoff, prohibit the development of engineering assumptions from which to estimate deck contaminant concentrations. The use of the data from any analysis of the untreated runoff that had flowed through an aircraft carrier catapult trough could result in mass loadings that are overestimated by orders of magnitude.

4.2 Environmental Concentrations
As with mass loadings, because the constituent concentrations vary with a number of factors, most of which vary over time since the last rainfall or washdown; the environmental concentrations will vary accordingly. For any given set of factors discussed in Section 3.4, the discharge concentrations for the catapult trough portion of deck runoff can be used as a worst case for a specific contributor.
The catapult trough discharges as a component of the flight deck runoff are diluted as they enter the receiving waters, but to what extent is unknown. Therefore, the raw concentration

### Deck Runoff 12 values are used for comparison to the Federal and most stringent state water quality criteria listed in Table 12. The comparisons show that a number of the constituent concentrations in catapult trough runoff exceed Federal and state acute water quality criteria, in addition to discharging oil exceeding the Federal discharge limits. 28 

### Chromium concentrations exceed the most stringent state’s water quality criteria. The detected metals that exceed the Federal and most stringent state water quality criteria are: cadmium, nickel, and lead. In addition, two metals, silver and copper, which were not detected, have reported limits that are more than an order of magnitude higher than their corresponding Federal and state water quality criteria. The reported phenols concentration exceeded the most stringent state criteria. The oil and grease concentration exceeds the Federal criterion and the concentrations reported are also likely to cause a visible sheen on receiving waters. Discharges of oil that cause a visible sheen on receiving waters must be reported. 28



### 4.3 Potential For Introducing Non-Indigenous Species
The potential for non-indigenous species transport is insignificant. The runoff due to rainfall and washdown has a low potential to contain non-indigenous species, and the runoff from green water is discharged in the same location from which it came aboard.

5.0 CONCLUSION
Oil in the deck runoff discharge has the potential to cause an adverse environmental effect. This conclusion is based upon observations of oil sheens on the water surface surrounding certain vessels during and after rainfalls.

6.0 DATA SOURCES AND REFERENCES
Table 13 shows the sources of data used to develop this NOD report.
Specific References

1. “Deck Runoff from U.S. Naval Vessels”, M. Rosenblatt & Son, Inc. Prepared for Naval Sea Systems Command. September 1996.

2. Dye, J., Public Works Office, Naval Submarine Base, Bangor, WA. Response to UNDS Questionnaire: Contained Washdowns and Deck Runoff.

3. Aivalotis, Joyce, USCG. Report Regarding USCG Outstanding Information, May 29, 1997, David Ciscon, M. Rosenblatt & Son, Inc.

4. UNDS Equipment Expert Meeting Minutes - Catapult Troughs, Water Brake, Jet Blast Deflector, Arresting Cables. August 22, 1996.

### Deck Runoff 13 5. UND S Equipment Expert Meeting Minutes - Catapult Discharges. July 26, 1996.

6. Commander, Naval Sea Systems Command. Memorandum to Commander, Naval Air Systems Command. Pollution of Coastal Waters Attributable to Catapult Lube Oil. December 16, 1992.

7. LCDR Mills, Staff (N43), COMNAVAIRLANT. AIRLANT Policy Relative To Aircraft Carrier Washdowns, August 21, 1997, Randy Salyer, M. Rosenblatt & Son, Inc.

8. ABECS Gibson, Staff (N43), COMNAVAIRPAC. AIRPAC Policy Relative To Aircraft Carrier Washdowns, August 21, 1997, Randy Salyer, M. Rosenblatt & Son, Inc.

9. LT Carlos Castillo, Staff, Commander Amphibious Group Two. Norfolk - Little Creek, VA. SURFLANT Policy Relative to Amphibious Assault Ship Flight Deck Washdowns, November 5, 1997, Jim O’Keefe, M. Rosenblatt & Son., Inc.

10. LCDR Southall, Staff (N42), Commander Surface Force, U.S. Pacific Fleet, San Diego, CA. SURFPAC Policy Relative To Amphibious Assault Ship Flight Deck and Surface Ship Weather Deck Washdowns, November 6, 1997, Jim O’Keefe, M. Rosenblatt & Son., Inc.

11. UNDS Equipment Expert Meeting Minutes - Catapult Wet Accumulator Steam Blowdown Discharge. August 20, 1996.

12. Stucka, Bob, MSC Field Engineer, Norfolk, VA. MSC Policy Relative To Flight Deck Washdowns, September 9, 1997, Jim O’Keefe, M. Rosenblatt & Son, Inc.

13. Code of Federal Regulations, 33CFR155, Sub Part B, Vessel Equipment.

14. Hofmann, Hans, MR&S. Responses To Inquiries Regarding The Design Features In The T-AO 187 Class Oilers To Prevent Pollution, December 17, 1996, Clarkson Meredith, Versar, Inc.

15. North, Dick, Puget Sound Naval Shipyard, Boston Detachment, Boston, MA. Status of Pollution Preventative ShipAlts For Yard and Service Craft Oilers, September 3, 1997, Jim O’Keefe, M. Rosenblatt & Son, Inc. (MR&S).

16. Pentagon Ship Movement Data for Years 1991 -1995, Dated March 4, 1997.

17. Ship Management Information System Report JQ02, U.S. Naval Battle Forces As Of 30 June 1997, June 13, 1997. 20.

18. Weersing, Penny, MSC Engineer, Estimates o f Time In U.S. Ports For MSC Vessels, March 19, 1997, Jim O’Keefe, M. Rosenblatt & Son, Inc. U.S. Navy Public Affairs Home Page. List of U.S. Navy Ships and Their Homeports, March 1, 1997.

### Deck Runoff 14 19. U.S. Coast Guard, Listing of Vessels and Permanent Stations, 1992.

20. Naval Sea Systems Command (NAVSEA), Data Book for Boats and Craft of the United States Navy, NAVSEA 0900-LP-084-3010, Revision A. May 1988.

21. U.S. Army Combined Arms Support Command, Army Watercraft Master Plan, November 1996.

22. Headqua rters, Dept. of the Army. Watercraft Equipment Characteristics and Data, Technical Manual TM 55-500, May 1992.

23. Sharpe, Richard. Jane’s Fighting Ships. Jane's Information Group, Ltd.,1996.

24. Aivalotis, Joyce, USCG. USCG Ship Movement Data, May 27, 1997, Lee Sesler, Versar, Inc.

25. UNDS Ship Database, August 1, 1997.

26. The World Almanac and Book of Facts. Mahwah: Funk & Wagnalls, 1995.

27. “Waste Buster” Test of Oily Waste Treatment Facility. NNS Laboratory Services. April 1994.

28. Code o f Federal Regulations, 40 CFR 110, EPA Regulations on Discharge of Oil.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.

### Deck Runoff 15 Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
M. Rosenblatt & Son, Inc. Comments on Draft Nature of Discharge Report: Flight Deck Runoff, Aircraft Carriers. February 13, 1997.
UNDS Equipment Expert Meeting Minutes - Deck Runoff. September 19 and October 17, 1996.
Wallace, Christine, Public Works Office, Naval Base, Norfolk, VA. Response to UNDS Questionnaires: Deck Runoff, Solvent Cleaning, Degreasing Solutions, Aircraft Washdowns.
Military Specifications for Petroleum Compounds: Diesel Engine Lubricating Oil Data, MIL-L-9000 Military Symbol (MS) 9250 JP-5 Aviation Fuel Data, MIL-T-5624 NATO Code F44 Fuel, Naval Distillate Data, MIL-F-16884 NATO Code F76
3M Corporation. MSDS - FC-203CF Light Water Brand Aqueous Film Forming Foam, April 1995.
MSDSs from Vermont SIRI - http://hazard.com/MSDS: Texaco - Marine Diesel Blend 00813 (NATO Code F76) - Diesel Fuel DFM Amoco - Marine Diesel Fuel (F76) - Diesel Fuel DFM U.S. Oil Refining - JP-5 Jet Fuel, Turbine Engine, Aviation JP-5 F (44)

### Deck Runoff 16 P-D-680 Type I Dry Cleaning Solvent (bought to spec) Captree Chemical - Sodium Metasilicate, Pentahydrate Lidochem - Sodium metasilicate anhydrous
Naval Surface Warfare Center, Norfolk Division. UNDS Small Boats and Craft Meeting, September 12 and 13, 1996.
Patty’s Industrial Toxicology, 2nd Ed. New York: John Wiley & Sons, 1981.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Table 1. Listing of Ships and Vessels for Deck Runoff Navy, MSC, USCG and Army

Homeported Additional Ship Dimensions Helo Pad Dimensions Weather Days Vessel Category In U.S.* Projected Length Beam Length Width Deck Area within 12 n.m. (ft) (ft) (ft) (ft) (sq ft) * Where ships of this class are homeported in foreign ports, their number appears in parentheses, e.g., 8 (2) indicates 8 ships in the class, 2 homeported overseas, therefore only six are considered in calculating the deck runoff in that class. ** Denotes ships which do not embark helicopters as part of their normal complement, so helocopter flight deck area is included in weather deck area *** DDG 51-78 do not have helos embarked; DDG 79 and Follow will have two embarked helos. Navy Ships Aircraft Carriers Forrestal Class Carrier (CV 59) 1 (1) 0 1052 130 220,000 0 Kitty Hawk Class Carriers (CV 63) 3 0 1063 130 220,000 139 Enterprise Class Carriers (CVN 65) 1 0 1123 133 230,000 78 Nimitz Class Carriers (CVN 68) 7 2 1092 134 230,000 149

Amphibious Assault Ships Wasp Class Assault Ship (LHD 1) 4 3 819 106 86,814 188 Tarawa Class Assault Ship (LHA 1) 5 (1) 0 820 118 92,800 175 Iwo Jima Class Assault Ship (LPH 2) 2 0 602 104 62,608 189

Submarines Ohio Class Ballistic Missile Submarines (SSBN 726) 17 0 560 42 15,288 185 Sturgeon Class Attack Submarine (SSN 637) 13 0 302.2 31.8 6,246 185 Los Angeles Class Attack Submarine (SSN 688) 56 0 362 33 7,765 185 Narwhal Class Submarine (SSN 671) 1 0 314.6 37.7 7,709 185 Benjamin Franklin Class Submarines (SSN 640) 2 0 425 33 9,116 185

Surface Ships Virginia Class Cruisers (CGN 38) 1 0 585 63 20** 27 28,747 164 California Class Cruisers (CGN 36) 2 0 596 61 43** 38 28,358 146 Ticonderoga Class Cruisers (CG 47) 27 (2) 0 567 55 54 40 22,164 169 Kidd Class Destroyers (DDG 993) 4 0 563.3 55 52** 41 24,166 104 Arleigh Burke Class Destroyers (DDG 51)*** 18 (2) 30 504.5 66.9 49** 42 26,326 178 Spruance Class Destroyers (DD 963) 31 (3) 0 563.2 55.1 52 42 22,021 181 Oliver Hazard Perry Class Frigates (FFG 7) 43 (2) 0 445 45 54 36 13,676 170 Blue Ridge Class Command Ships (LCC 19) 2 (1) 0 636.5 107.9 72** 74 53,569 181 Austin Class Amphibious Transport Dock (LPD 4) 3 0 570 100 209** 61 44,460 181 Austin Class Amphibious Transport Dock (LPD 7) 3 (1) 0 570 100 199** 61 44,460 191 Austin Class Amphibious Transport Dock (LPD 14) 2 0 570 100 203** 75 44,460 195 Whidbey Class Dock Landing Ships (LSD 41) 8 (2) 0 609.5 84 189** 71 39,934 171 Harpers Ferry Class Dock Landing Ships (LSD 49) 3 1 609.5 84 188** 72 39,934 216 Anchorage Class Dock Landing Ships (LSD 36) 5 0 553.3 84 78** 78 36,252 218 Newport Class Tank Landing Ships (LST 1179) 3 0 522.3 69.5 49** 54 28,314 183 Avenger Class Mine Countermeasures Ship (MCM 1) 14 (2) 0 224 39 6,814 239 Osprey Class Coastal Minehunters (MHC 51) 12 6 188 35.9 5,264 239 Cyclone Class Patrol Ships (PC 1) 13 1 170.3 24.9 3,308 110

### Table 1. Listing of Ships and Vessels for Deck Runoff Navy, MSC, USCG and Army

Homeported Additional Ship Dimensions Helo Pad Dimensions Weather Days Vessel Category In U.S.* Projected Length Beam Length Width Deck Area within 12 n.m. (ft) (ft) (ft) (ft) (sq ft) * Where ships of this class are homeported in foreign ports, their number appears in parentheses, e.g., 8 (2) indicates 8 ships in the class, 2 homeported overseas, therefore only six are considered in calculating the deck runoff in that class. ** Denotes ships which do not embark helicopters as part of their normal complement, so helocopter flight deck area is included in weather deck area *** DDG 51-78 do not have helos embarked; DDG 79 and Follow will have two embarked helos.

Patrol and Landing Craft Pegasus Class Mk V Patrol Boats (SOC/PBF) 7 14 82 17.5 1,119 320 Mk III Patrol Boats (PB) 14 68 18 955 320 Stinger Class Patrol Boats (PB) 10 65 18 955 320 Mk II River Patrol Boats (PBR) 25 35 9.3 246 320 Landing Craft Air Cushion (LCAC) 91 (3) 81 43 3,483 320 LCU 1600 Class Utility Landing Craft (LCU) 40 134.9 29 3,912 320 LCM 8 Class Mechanized Landing Craft (LCM) 100 73.7 21 575 320 LCM 6 Class Mechanized Landing Craft (LCM) 60 56.2 14 300 320 Landing Craft Personnel (LCPL) 130 36 12.1 160 320 Armored Troop Carriers (AT) 21 36 12.7 365 365

Auxiliaries Jumboised Cimmaron Class Oilers (AO 177) 5 0 709 88 59** 76 48,666 191 Sacramento Class Fast Combat Support (AOE 1) 4 0 793 107 83 71 60,291 186 Supply Class Fast Combat Support (AOE 6) 3 1 754 107 70 95 56,279 116 Raleigh Class Command ship (AGF 3) 1 (1) 522 90** 90** 76 34,201 0 Austin Class Command Ship (AGF 11) 1 0 570 100 195 78 29,250 186 Safeguard Class Salvage Ships (ARS 50) 4 0 255 51 20** 20 10,144 214 Simon Lake Class Submarine Tender (AS 33) 1 (1) 644 85 39** 65 42,697 0 Emory S Land Class Submarine Tenders (AS 39) 3 0 643.8 85 31** 34 42,684 295 Iwo Jima Class MCM Support Ship (MCS 12) 1 0 602 104 62,608 189 Diving Tenders (YDT) 3 50 12 600 320 Harbor Utility Craft (YFU) 2 134.9 29 3,912 365 Patrol Craft (YP) 28 108 24 2,022 365 Torpedo Trials Craft (YTT) 3 186.5 40 5,819 320 Torpedo Retrievers, 65 ft (TR) 3 65 14 710 320 Torpedo Retrievers, 72 ft (TR) 5 72 15 842 320 Torpedo Retrievers, 85 ft (TR) 5 85 18 1,193 320 Torpedo Retrievers, 100 ft (TR) 3 100 21 1,638 320 Torpedo Retrievers, 120 ft (TR) 6 120 25 2,340 320 Large Harbor Tugs (YTB) 72 109 30 2,551 320 Ashville Class Research Ships (YAG) 3 164.5 23.8 3,054 320 Fuel Oil Barge, Nonselfpropelled (YON) 40 165 40 6,600 365 Fuel Gasoline Barge, Nonselfpropelled (YOGN) 9 165 40 6,600 365 Fuel Oil Storage Barge (YOS) 5 165 40 6,600 365 Miscellaneous Boats and Craft 3000+ Various dimensions

- 365 Military Sealift Command Kilauea Class Ammunition Ships (T-AE) 8 0 564 81 69 60 31,494 45

### Table 1. Listing of Ships and Vessels for Deck Runoff Navy, MSC, USCG and Army

Homeported Additional Ship Dimensions Helo Pad Dimensions Weather Days Vessel Category In U.S.* Projected Length Beam Length Width Deck Area within 12 n.m. (ft) (ft) (ft) (ft) (sq ft) * Where ships of this class are homeported in foreign ports, their number appears in parentheses, e.g., 8 (2) indicates 8 ships in the class, 2 homeported overseas, therefore only six are considered in calculating the deck runoff in that class. ** Denotes ships which do not embark helicopters as part of their normal complement, so helocopter flight deck area is included in weather deck area *** DDG 51-78 do not have helos embarked; DDG 79 and Follow will have two embarked helos. Mars Class Combat Stores Ship (T-AFS) 5 0 581 79 70 62 31,461 45 Sirius Class Combat Stores Ship (T-AFS) 3 0 524 72 64 67 25,140 45 Henry J. Kaiser Oilers (T-AO) 12 0 677 97 67** 73 51,222 50 Hayes Class Acoustic Research Ship (T-AG) 1 0 256.5 75 15,005 45 Mission Class Navigation Research Ship (T-AG) 1 0 595 75 34,808 45 Observation Is. Class (T-AGM) 1 0 563 76 33,375 45 Stalwart Class Ocean Surveillance Ship (T-AGOS) 5 0 224 43 7,513 60 Victorious Class Ocean Surveillance Ships (T-AGOS) 4 0 234.5 93.6 20** 20 21,949 120 Silas Bent Class Surveying Ships (T-AGS) 2 0 285.3 48 10,682 45 Waters Class Surveying Ship (T-AGS) 1 0 455 68.9 24,453 45 McDonnell Class Surveying Ships (T-AGS) 2 0 208 45 7,301 45 Pathfinder Surveying Ships (T-AGS) 4 1 328.5 58 14,861 45 Mercy Class Hospital Ships (T-AH) 2 0 894 105.6 80** 80 73,637 365 Maersk Class Strategic Sealift Ships (T-AKR) 3 0 946 106 80** 80 78,215 320 Gordon Class Strategic Sealift Ships (T-AKR) 2 1 956 106 80** 80 79,042 320 Algol Class Fast Sealift Ships (T-AKR) 8 0 946.2 106 81** 84 78,232 320 Zeus Class Cable Repairing Ship (T-ARC) 1 0 502.5 73 28,612 45 Powhatan Class Fleet Ocean Tugs (T-ATF) 7 0 240.2 42 25** 20 7,869 120

USCG Hamilton Class High Endurance Cutters (WHEC) 12 0 378 42 50 35 10,633 154 Famous Class Medium Endurance Cutters (WMEC) 4 0 270 38 40 30 6,803 139 Famous Class Medium Endurance Cutters (WMEC) 9 0 270 38 40 30 6,803 166 Reliance Class Medium Endurance Cutters (WMEC) 5 0 210.5 34 48** 30 5,582 238 Reliance Class Medium Endurance Cutters (WMEC) 11 0 210.5 34 48** 30 5,582 151 Polar Class Icebreaker (WAGB) 2 0 399 86 65 82 21,435 365 Bay Class Tugs (WTGB) 9 0 140 37.6 4,106 365 Point Class Patrol Craft (WPB) 36 0 83 17.2 1,114 320 Island Class Patrol Boats (WPB) 49 0 110 21 1,802 320 Juniper Class Seagoing Buoy Tender (WLB) 2 1 225 46 8,073 287 Balsam Class Buoy Tenders (WLB) 23 0 180 37 5,195 295 Keeper Class Buoy Tenders (WLM) 2 12 175 36 4,914 227 Red Class Buoy Tenders (WLM) 9 157 33 4,041 227 White Sumac Class Buoy Tenders (WLM) 4 133 31 3,216 227 Inland Buoy Tenders (WLI) 2 100 24 1,872 365 Inland Buoy Tenders (WLI) 4 65 17 862 365 River Buoy Tenders, 65 ft (WLR) 6 65 22 1,115 365 River Buoy Tenders, 75 ft (WLR) 13 75 22 1,287 365

### Table 1. Listing of Ships and Vessels for Deck Runoff Navy, MSC, USCG and Army

Homeported Additional Ship Dimensions Helo Pad Dimensions Weather Days Vessel Category In U.S.* Projected Length Beam Length Width Deck Area within 12 n.m. (ft) (ft) (ft) (ft) (sq ft) * Where ships of this class are homeported in foreign ports, their number appears in parentheses, e.g., 8 (2) indicates 8 ships in the class, 2 homeported overseas, therefore only six are considered in calculating the deck runoff in that class. ** Denotes ships which do not embark helicopters as part of their normal complement, so helocopter flight deck area is included in weather deck area *** DDG 51-78 do not have helos embarked; DDG 79 and Follow will have two embarked helos. River Buoy Tenders, 115 ft (WLR) 1 115 30 2,691 365 Pamlico Class Construction Tenders (WLIC) 4 160.9 30 3,765 365 Cosmos Class Construction Tenders (WLIC) 3 100 24 1,872 365 Anvil/Clamp Class Construction Tenders (WLIC) 9 75 22 1,287 365 Harbor Tugs (WYTL) 11 65 19 963 365 Motor Lifeboats 26 94 47.9 14 523 365 Misc. Rescue and Utility Craft 1400+ Various Sizes 365

Army Vessels Frank Besson Class Logistic Support Ship (LSV) 6 272.8 60 6,547 183 Mechanized Landing Craft (LCM 8) 104 73.7 21 511 320 Utility Landing Craft (LCU 2000) 34 174 42 2,412 320 Utility Landing Craft (LCU 1600) 14 135 29 1,292 320 Lighter Amphibious Resupply, Cargo (LARC) 23 35 8 92 365 Large Tug (LT 128) 10 128 36 3,594 320 Large Tug (LT 100) 15 107 26.5 2,212 320 Barge Derrick, 115T (BD) 5 175 75 13,125 365 Barge Derrick, 89T (BD) 7 140 70 9,800 365 Barge Cargo (BC) 3 110 32 3,520 365

### Table 2. Estimate of Annual Weather Deck Runoff From Precipitation Navy Surface Ships, By Port

Ship Class Home Port: Bremerton, WA Everett, WA Ingleside, TX Little Creek, VA Mayport, FL Average Annual Rainfall (in): 50 31 30 45 52 Weather Deck Area (sq ft) Days within 12

n.m. No. Ships No. Ships No. Ships No. Ships No. Ships Virginia Class Cruisers (CGN 38) 28,747 164 1 California Class Cruisers (CGN 36) 28,358 146 1 Ticonderoga Class Cruisers (CG 47) 22,164 169 5 Kidd Class Destroyers (DDG 993) 24,166 104 2 Arleigh Burke Class Destroyers (DDG 51) 26,326 178 2 Spruance Class Destroyers (DD 963) 22,021 181 2 6 Oliver Hazard Perry Class Frigates (FFG 7) 13,676 170 3 10 Blue Ridge Class Command Ships (LCC 19) 53,569 181 Austin Class Transport Docks (LPD 4) 44,460 181 Austin Class Transport Docks (LPD 7) 44,460 191 Austin Class Transport Docks (LPD 14) 44,460 195 Whidbey Class Dock Landing Ships (LSD 41) 39,934 171 4 Harpers Ferry Class Dock Landing Ships (LSD 49) 39,934 216 2 Anchorage Class Dock Landing Ships (LSD 36) 36,252 218 2 Newport Class Tank Landing Ships (LST 1179) 28,314 183 1 Avenger Class Mine Countermeasures Ship (MCM 1) 6,814 239 12 Osprey Class Coastal Minehunters (MHC 51) 5,264 239 9 Cyclone Class Patrol Ships (PC 1) 3,308 110 9 Austin Class Command Ship (AGF 11) 29,250 186 Safeguard Class Salvage Ships (ARS 50) 10,144 214 2 Emory S Land Class Submarine Tenders (AS 39) 42,684 295

Estimated Surface Runoff, (gal/yr): 756,138 1,057,434 1,581,483 5,623,465 6,684,183

### Table 2. Estimate of Annual Weather Deck Runoff From Precipitation Navy Surface Ships, By Port

Ship Class Home Port: Average Annual Rainfall (in): Weather Deck Area (sq ft) Days within 12

n.m. Virginia Class Cruisers (CGN 38) 28,747 164 California Class Cruisers (CGN 36) 28,358 146 Ticonderoga Class Cruisers (CG 47) 22,164 169 Kidd Class Destroyers (DDG 993) 24,166 104 Arleigh Burke Class Destroyers (DDG 51) 26,326 178 Spruance Class Destroyers (DD 963) 22,021 181 Oliver Hazard Perry Class Frigates (FFG 7) 13,676 170 Blue Ridge Class Command Ships (LCC 19) 53,569 181 Austin Class Transport Docks (LPD 4) 44,460 181 Austin Class Transport Docks (LPD 7) 44,460 191 Austin Class Transport Docks (LPD 14) 44,460 195 Whidbey Class Dock Landing Ships (LSD 41) 39,934 171 Harpers Ferry Class Dock Landing Ships (LSD 49) 39,934 216 Anchorage Class Dock Landing Ships (LSD 36) 36,252 218 Newport Class Tank Landing Ships (LST 1179) 28,314 183 Avenger Class Mine Countermeasures Ship (MCM 1) 6,814 239 Osprey Class Coastal Minehunters (MHC 51) 5,264 239 Cyclone Class Patrol Ships (PC 1) 3,308 110 Austin Class Command Ship (AGF 11) 29,250 186 Safeguard Class Salvage Ships (ARS 50) 10,144 214 Emory S Land Class Submarine Tenders (AS 39) 42,684 295

Estimated Surface Runoff, (gal/yr): Norfolk, VA Pearl Hr, HI Pascagoula, MS San Diego, CA 45 25 72 10

No. Ships No. Ships No. Ships No. Ships

1 7 3 2 8 2 7 2 5 9 4 6 12 2 2 12 1 1 2 1 1 2 3 1 3 1

4 1 2 1 1

14,458,310 2,165,816 1,492,969 3,451,692

Estimated Total, All Ports (gal/yr): 37,271,490

### Table 3. Estimate of Annual Weather Deck Runoff From Precipitation MSC, Army and USCG Surface Ships

Average Annual Rainfall (in): 40 Weather Deck Area Days

within Number of

Vessels Estimated

Runoff, (gal): Vessel Category (sq ft) 12 n.m. Military Sealift Command Kilauea Class Ammunition Ships (T-AE) 31,494 45 8 774,534 Mars Class Combat Stores Ship (T-AFS) 31,461 45 5 483,587 Sirius Class Combat Stores Ship (T-AFS) 25,140 45 3 231,853 Henry J. Kaiser Oilers (T-AO) 51,222 50 12 2,099,533 Hayes Class Acoustic Research Ship (T-AG) 15,005 45 1 46,129 Mission Class Navigation Research Ship (T-AG) 34,808 45 1 107,004 Observation Is. Class (T-AGM) 33,375 45 1 102,600 Stalwart Class Ocean Surveillance Ship (T-AGOS) 7,513 60 5 153,975 Victorious Class Ocean Surveillance Ships (T-AGOS) 21,949 120 4 719,741 Silas Bent Class Surveying Ships (T-AGS) 10,682 45 2 65,674 Waters Class Surveying Ship (T-AGS) 24,453 45 1 75,172 McDonnell Class Surveying Ships (T-AGS) 7,301 45 2 44,888 Pathfinder Surveying Ships (T-AGS) 14,861 45 4 182,746 Mercy Class Hospital Ships (T-AH) 73,637 365 2 3,672,277 Maersk Class Strategic Sealift Ships (T-AKR) 78,215 320 3 5,129,551 Gordon Class Strategic Sealift Ships (T-AKR) 79,042 320 2 3,455,850 Algol Class Fast Sealift Ships (T-AKR) 78,232 320 8 13,681,694 Zeus Class Cable Repairing Ship (T-ARC) 28,612 45 1 87,959 Powhatan Class Fleet Ocean Tugs (T-ATF) 7,869 120 7 451,557 USCG Hamilton Class High Endurance Cutters (WHEC) 10,633 154 12 1,342,412 Famous Class Medium Endurance Cutters (WMEC) 6,803 139 4 258,392 Famous Class Medium Endurance Cutters (WMEC) 6,803 166 9 694,312 Reliance Class Medium Endurance Cutters (WMEC) 5,582 238 5 453,826 Reliance Class Medium Endurance Cutters (WMEC) 5,582 151 11 633,449 Polar Class Icebreaker (WAGB) 21,435 365 2 1,068,959 Bay Class Tugs (WTGB) 4,106 365 9 921,430 Point Class Patrol Craft (WPB) 1,114 320 36 876,335 Island Class Patrol Boats (WPB) 1,802 320 49 1,930,053 Juniper Class Seagoing Buoy Tender (WLB) 8,073 287 2 316,565 Balsam Class Buoy Tenders (WLB) 5,195 295 23 2,407,882 Keeper Class Buoy Tenders (WLM) 4,914 227 2 152,408 Red Class Buoy Tenders (WLM) 4,041 227 9 564,018 White Sumac Class Buoy Tenders (WLM) 3,216 227 4 199,485 Inland Buoy Tenders (WLI) 1,872 365 2 93,357 Inland Buoy Tenders (WLI) 862 365 4 85,966 River Buoy Tenders, 65 ft (WLR) 1,115 365 6 166,875 River Buoy Tenders, 75 ft (WLR) 1,287 365 13 417,187 River Buoy Tenders, 115 ft (WLR) 2,691 365 1 67,100 Pamlico Class Construction Tenders (WLIC) 3,765 365 4 375,527 Cosmos Class Construction Tenders (WLIC) 1,872 365 3 140,035 Anvil/Clamp Class Construction Tenders (WLIC) 1,287 365 9 288,822 Harbor Tugs (WYTL) 963 365 11 264,219 Motor Lifeboats 523 365 26 339,110 Army Frank Besson Class Logistic Support Ship (LSV) 6,547 183 6 491,105 Mechanized Landing Craft (LCM 8) 511 320 104 1,161,183 Utility Landing Craft (LCU 2000) 2,412 320 34 1,792,495 Utility Landing Craft (LCU 1600) 1,292 320 14 395,403 Lighter Amphibious Resupply, Cargo (LARC) 92 365 23 52,992 Large Tug (LT 128) 3,594 320 10 785,730 Large Tug (LT 100) 2,212 320 15 725,240 Barge Derrick, 115T (BC) 13,125 365 5 1,636,359 Barge Derrick, 89T (BD) 9,800 365 7 1,710,541 Barge Cargo (BC) 3,520 365 3 263,314

Estimated Total Annual Runoff (gals): 54,638,410Table 4. Estimate of Annual CV/CVN Flight Deck Runoff From Precipitation

Homeport CV/CVN Flt Estimated Avg. Annual Estimated Deck Area Days within Precip. (in) Annual (sq.ft.) 12 n.m. Runoff (gal) Bremerton, WA: USS Carl Vinson (CVN 70) 230,000 149 50 2,926,455 USS Nimitz (CVN 68) 230,000 149 50 2,926,455 Everett, WA: USS Abraham Lincoln (CVN 72) 230,000 149 31 1,814,402 Mayport, FL: USS John F. Kennedy (CV 67) 220,000 139 52 2,715,804 Norfolk, VA: USS Dwight D. Eisenhower (CVN 69) 230,000 149 45 2,633,809 USS Enterprise (CVN 65) 230,000 78 45 1,378,773 USS George Washington (CVN 73) 230,000 149 45 2,633,809 USS John C. Stennis (CVN 74) 230,000 149 45 2,633,809 USS Theodore Roosevelt (CVN 71) 230,000 149 45 2,633,809 San Diego, CA: USS Constellation (CV 64) 220,000 139 10 522,270 USS Kitty Hawk (CV 63) 220,000 139 10 522,270 Total Annual Gallons: 23,341,665

Table 5. Estimate of Annual Helicopter Flight Deck Runoff from Precipitation Navy Amphibious Assault and MCM Support Ships

Home Port: Norfolk, VA San Diego, CA Ingleside, TX Days No. Ships Avg. Ann. No. Ships Avg. Ann. No. Ships Avg. Ann. Ship Class Flt Deck within Rain (in) Rain (in) Rain (in) Area (sq ft) 12 n.m. Wasp Class (LHD) 86,814 188 2 45 2 10 0 0 Tarawa Class (LHA) 92,800 175 2 45 2 10 0 0 Iwo Jima Class (LPH) 62,608 189 1 45 1 10 0 0 Iwo Jima Class (MCS) 62,608 320 0 45 0 10 1 30

Estimated Runoff, gal: 5,914,333 1,314,296 1,026,497

Total Amphibious Assault Ship Runoff: 7,228,629 Total Mine Countermeasure Runoff: 1,026,497 Total Runoff, gallons: 8,255,126

### Table 6. Estimate of Annual Helicopter Flight Deck Runoff from Precipitation Navy Surface Ships

Ship Class Home Port: Bremerton WA Earle, NJ Everett, WA Mayport,

FL Norfolk, VA Pascagoula MS Pearl, HI San Diego, CA Avg.Annual Rainfall (in): 50 42 31 52 45 72 25 10 Navy Surface Ships: Flt Deck Days within No. Ships No. Ships No. Ships No. Ships No. Ships No. Ships No. Ships No. Ships Area (sq ft) 12 n.m. Ticonderoga Class Cruisers (CG) 2,160 169 5 7 2 3 8 Spruance Class Destroyers (DD) 2,184 181 2 6 9 4 6 Oliver Hazard Perry Class Frigates (FFG) 1,944 170 3 10 12 2 2 12 Austin Class Command Ships (AGF) 15,210 186 1 Sacramento Class Fst Combat Spt (AOE1) 5,893 186 2 2 Supply Class Fst Combat Spt (AOE6) 6,650 116 1 2

Annual Flight Deck Runoff (gals): 253,073 157,248 94,349 666,234 893,170 171,052 142,492 206,430 Total Annual Flight Deck Runoff (gals): 2,584,049

### Table 7. Estimate of Annual Flight Deck Runoff From Precipitation MSC and USCG Surface Ships

Estimated

No. Ships Flight Deck Avg Days U.S. Avg. Annual

Area (sq ft) within 12 n.m. An. Prec.(in) Runoff (gal) Military Sealift Command Kilauea Class Ammunition Ships (T-AE) 8 4,140 45 40 101,817 Mars Class Combat Stores Ship (T-AFS) 5 4,340 45 40 66,710 Sirius Class Combat Stores Ship (T-AFS) 3 4,288 45 40 39,546 Henry J. Kaiser Oilers (T-AO)* 12 0 50 40 0 Estimated Subtotal (gals/yr): 208,073 USCG Hamilton Class High Endurance Cutters (WHEC) 12 1,750 154 40 220,931 Famous Class Medium Endurance Cutters (WMEC) 4 1,200 139 40 45,580 Famous Class Medium Endurance Cutters (WMEC) 9 1,200 166 40 122,475 Polar Class Icebreaker (WAGB) 2 5,330 365 40 265,807 Estimated Subtotal (gals/yr): 654,793

Estimated Total (gal/yr): 862,866 * Denotes ships having helicopter flight decks but do not embark helicopters as part of their normal complement. Flight deck area included in deck area listed in Table 1.



### Table 8. Estimate of Annual Helicopter Flight Deck Runoff From Washdowns USCG Surface Ships

Ship Class Flt Deck Volume (gals/wash) No. Ships In Port Area (sq ft) Cleaner Rinseate Total U.S. Ports Washdowns Totals Hamilton Class High Endurance Cutters (WHEC) 1,750 18 72 90 12 22 23,760 Famous Class Medium Endurance Cutters (WMEC) 1,200 12 48 60 4 20 4,800 Famous Class Medium Endurance Cutters (WMEC) 1,200 12 48 60 9 24 12,960 Polar Class Icebreaker (WAGB) 5,330 54 216 270 2 52 28,080 Estimated Total (gals/yr): 69,600 * Assumes flight deck washed as a result of visiting helicopter operations.

### Table 9a. Estimate of Annual Weather Deck Runoff From Precipitation Oiler Weather Decks

U.S. Home Port: Bremerton Earle Norfolk Pearl Harbor

WA NJ VA HI Average Annual Rainfall (in): 50 42 45 25 Ship Class Deck Area Days within 12 n.m. No. Ships No. Ships No. Ships No. Ships Jumboised Cimarron Class Oilers (AO) 48,666 191 3 2 Sacramento Class Fast Combat Support Ships (AOE 1) 60,291 186 2 2 Supply Class Fast Combat Support Ships (AOE 6) 56,279 116 1 1 1 Henry J Kaiser Class Oilers (TAO187)* 0 50 Estimated Runoff, (gal): 2,472,708 2,077,075 2,644,856 793,749

* See Tables 1 and 3 Estimated Annual Total, All Ports (gal): 7,988,388



### Table 9b. Estimate of Annual Weather Deck Runoff From Precipitation

Navy Auxiliary Service Craft Oilers

Service Craft Category Deck Area (sq ft) Days within 12

n.m. No. Ships U.S. Avg. An. Rainfall (in) Estimated

Annual Runoff (gal) Fuel Oil Barge, Nonself Propelled (YON) 6,600 365 40 40 6,582,840 Fuel Gasoline Barge, Nonself Propelled (YOGN) 6,600 365 9 40 1,481,139 Fuel Oil Storage Barge (YOS) 6,600 365 5 40 822,855

Estimated Annual Total (gal): 8,886,834

### Table 10. Summary of Annual Runoff Estimates

Weather Deck Runoff from Precipitation Totals (gal/yr) Navy Surface Ships 37,271,490 MSC, Army, and USCG Surface Ships 54,638,410 Navy Oilers 7,988,388 Navy Service Craft, Oilers 8,886,834

Flight Deck Runoff from Precipitation

Navy Aircraft Carriers 23,341,665 Navy Amphibious Assault Ships 7,228,629 Navy Mine Countermeasure Support Ship 1,026,497 Navy Surface Ships 2,584,049 MSC and USCG Surface Ships 862,866

Flight Deck Runoff from Freshwater Washdowns

USCG Surface Ships 69,600

Estimated Annual Total (gal/yr) 143,898,427

### Table 11. Laboratory Results, Catapult Trough Drains Aqueous Phase Discharge*

Constituent Sample Results (mg/L)

Date: 4/13/94 4/14/94 Phenols 4.6 5.3 Oil and grease 9,683 13,919 Silver <0.050 <0.050 Cadmium 0.155 0.141 Chromium 0.l03 0.088 Copper <0.050 <0.050 Nickel 1.90 1.81 Lead 26.1 76.3 Zinc <0.050 <0.050

Source: NNS Laboratory Services, 1994 28 * Data represent concentrations prior to processing through an oil water separator.

### Table 12. Comparison of Catapult Trough Drains Discharge to Water Quality Criteria 27

Constituent Sample Results (mg/L) Federal Acute WQC (mg/L) Most Stringent State Acute WQC Date: 4/13/94 4/14/94 (mg/L) Phenols 4.6 5.3 none 0.17 (HI) Oil and grease 9,683 13,919 Visible sheen 1 /15 2 5 (FL) Silver <0.050 <0.050 0.0019 0.0012 (WA) Cadmium 0.155 0.141 0.042 0.0093 (FL, GA) Chromium 0.103 0.088 1.1 0.05 (FL, GA) Copper <0.050 <0.050 0.0024 0.0025 (WA) Lead 26.1 76.3 0.210 0.0056 (FL, GA) Nickel 1.90 1.81 0.074 0.0083 (FL, GA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

FL = Florida GA = Georgia HI = Hawaii WA = Washington

1. The Federal Pollution Control Act, 40CFR110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on the receiving waters. 2. International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 is implemented by the Act to Prevent Pollution From Ships (APPS).



### Table 13. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Dirty Ballast 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Dirty Ballast

### Dirty Ballast 2 2.0 D ISCHARGE DESCRIPTION
This section describes the dirty ballast discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Dirty ballast is created when seawater is pumped into fuel tanks for the purpose of improving ship stability. Ballast is weight added to a vessel to move the center of gravity to a position that increases the vessel's stability. Ballast is normally placed low within a vessel's hull to lower the center of gravity. Permanent ballast is usually heavy solid material, such as lead. Temporary ballast is normally seawater, which is pumped in and out of tanks in the vessel.
Dirty ballast systems are different from compensated ballast and clean ballast systems. Compensated ballast systems continuously replace fuel with water in a system of tanks as fuel is consumed. Clean (or segregated) ballast systems have tanks that only carry ballast water; therefore, the ballast water does not mix with fuel. These systems are covered in other NOD reports. In a dirty ballast system, water is added to a fuel tank after most of the fuel is used. Some fuel remaining in the tank mixes with the ballast water, producing "dirty" ballast.
Most classes of Armed Forces vessels use segregated tanks as the primary ballast system and use dirty ballast systems only in extraordinary or emergency situations. Some vessel classes, however, are not provided with clean ballast systems. These vessels regularly use dirty ballast systems and discharge overboard, using oil content monitors (OCM) and oil water separators (OWS) to avoid discharging oil at concentrations greater than regulatory limits. 1 

### Using fuel tanks for ballast water degrades fuel quality and is therefore avoided whenever possible.
As a vessel consumes fuel, air displaces the fuel in its fuel tanks, thus reducing the vessel’s stability. There is an added detrimental effect to stability when a tank is partially full and the liquid inside can slosh around. The degree to which these factors affect ship stability are dependent on ship design and the sea state. Some classes of ships are more susceptible to stability problems than others and certain locations have historically high wave action. When ship stability is threatened, ballast water can be pumped into a fuel tank to replace the consumed fuel and to regain stability. Ballast water is discharged when it is no longer needed for operational reasons or when preparing for fuel reintroduction.
To maintain safe stability, vessels without clean ballast systems may begin ballasting fuel tanks when remaining ship’s fuel drops to approximately 70-80% of total capacity. These vessels may continue to ballast fuel tanks until approximately 20% of ship’s fuel capacity remains (the minimum percentage allowed by U.S. Coast Guard (USCG) ships). 1 

### Therefore, by the end of a voyage, as much as 80% of the fuel tanks’ contents could be seawater.
Procedures have been established for both ballasting and deballasting to minimize the concentration of fuel in the dirty ballast. To prepare a fuel tank for ballast, most of the remaining

### Dirty Ballast 3 fuel is pumped to another fuel tank. The small quantities of fuel not removed in this first step is transferred to a waste oil tank. When deballasting, most of the dirty ballast is pumped overboard, while being monitored by an OCM, which measures the concentration of oil (fuel) in the water. If the OCM detects oil concentrations in excess of the 15 parts per million (ppm), an alarm sounds and the overboard discharge is stopped. The remaining dirty ballast is then processed through an OWS to reduce the oil concentration to 15 ppm or below, as measured by another OCM. The processed seawater is discharged overboard and the separated oil (fuel) is retained in a waste oil tank for pierside disposal.

2.2 Releases to the Environment
Dirty ballast is water which may contain res idual fuel and other constituents as a result of sea water being stored in fuel tanks. Dirty ballast is discharged to the environment after being processed through OCMs and/or OWS systems that ensure the ballast water fuel/oil concentrations are below Federal standards. The discharge is infrequent and occurs just above the waterline of the ship. The possible sources of the constituents of dirty ballast are seawater, fuel remaining in the tank, fuel additives, materials used in the ballast system, and the zinc anodes in the fuel tanks.

2.3 Vessels Producing the Discharge

Three USCG vessel classes use dirty ballast systems. Ships of the WHEC 378 Class (12 ships), WMEC 210 (16 ships), and the WAGB 399 Class icebreakers (2 ships) use their fuel tanks for ballasting in accordance with published Coast Guard directives and as conditions dictate.
In an emergency, all vessels of the Armed Forces with fuel tanks have the capability to generate emergency dirty ballast. Generation of emergency dirty ballast on Navy, MSC, Army, Air Force, Marine Corps, and the remainder of the USCG vessels occurs only when the vessels’ clean or compensated ballast systems are insufficient to maintain proper stability during extraordinary or emergency circumstances. Emergency dirty ballast is not considered a discharge under UNDS, and is not addressed in this report.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Two of the three USCG ship classes (WHEC 378 and WAGB 399) that use dirty ballast systems operate beyond 12 nautical miles (n.m.) of land and only transit through 12 n.m. of land

### Dirty Ballast 4 entering and leaving port. These ships may deballast within 12 n.m. of land using their OCM and OWS systems however this is rarely done. The third class of ship that uses a dirty ballast system is the USCG’s WMEC 210. These ships are located in several ports on the East, Gulf and West Coasts. They may conduct normal operations within 12 n.m. of land on these Coasts, and therefore may ballast and deballast within 12 n.m. of land. These vessels also deballast using their OCM and OWS systems.
The policy for MSC and Navy vessels, and the practice of USCG vessels, is to disch arge dirty ballast beyond 12 n.m. of shore, or to hold the dirty ballast until it can be transferred to a shore facility or containment barge. 2,3



### 3.2 Rate
A survey found that few cutters routinely use dirty ballast within 12 n.m. even though USCG policy permits discharge within this area if using an OWS and OCM. 4 

### The limited number of ballasting operations were insufficient to estimate the annual volume of dirty ballast discharged. Therefore, for cutter class vessels, fuel capacities, and the maximum percentage of these fuel tank capacities that are allowed by USCG policy for dirty ballasting, were used to estimate the annual volume of dirty ballast discharged. This resulted in an overestimate of dirty ballast discharge volumes for USCG vessels. Table 1 lists USCG vessel fuel capacities.
Using 80% of fuel capacities listed in Table 1 to estimate the deballasting discharge for each deballasting event, WMEC 210 Class vessels could discharge approximately 41,800 gallons of dirty ballast [(0.8)(52,236 gallons)]. The WAGB 399 Class ships could generate up to 1,080,000 gallons of dirty ballast and WHEC 378 Class ships could generate up to 166,400 gallons per deballasting event. The estimated maximum total annual discharge of dirty ballast for the three classes of USCG ships is 21.6 million gallons, using the number of deballast events per year from Table 2 and the following calculations. All of this discharge is assumed to occur within 12 n.m. of shore and the results are believed by the USCG to be a gross overestimate of the actual discharge. Of this 21.6 million gallons, two-thirds is from one class (WHEC 378) which operates principally beyond 12 n.m.

The estimated maximum dirty ballast total annual discharge for WHEC 378 Class ships is: Total (gal/yr) = sum of [(0.8)(capacity)(# vessels)(# deballasting events)] where, Total = estimated maximum dirty ballast total annual discharge 0.8 = maximum percentage of fuel tank capacity allowed by USCG policy for dirty ballast capacity = fuel capacity in gallons # vessels = number of vessels per class # deballasting events = number of deballasting events per year

### Dirty Ballast 5 (0.80) (208,000 gallons of fuel) (12 vessels in the class) (7 deballasting events per year) = approximately 14 million gallons per year.

The duration of USCG vessels’ dirty ballast discharge is estimated by considering deballasting procedures and equipment characteristics. Based on operational experience, approximately 75% of the dirty ballast can be discharged directly overboard while being monitored through an OCM at an estimated flow rate of 250 gallons per minute (gpm). 2 

### The remaining 25% of ballast is required to be processed through an OWS, at a flow rate of 25 gpm. Using a dirty ballast volume of 80% of vessel fuel capacity, an estimated flow rate of 250 gpm for direct ballast overboard discharge, and 25 gpm through the OWS, the discharge duration is summarized in Table 3. For example, the maximum time to deballast for WHEC 378 Class ships is approximately 36 hours.

These v alues result in the maximum expected time to deballast since the calculations assume the largest dirty ballast volume (the maximum allowed is 80% of the ship’s fuel capacity) and ignore any processing of ballast through the OWS performed concurrently with the ballast being discharged directly overboard. Also, it is unlikely that the entire duration of deballasting is within 12 n.m. of shore, so the calculations overestimate the amount of dirty ballast discharged within 12 n.m.

3.3 Constituents

Because process information and data on compensated fuel ballast, a similar discharge, were sufficient to characterize this discharge, no sampling was performed on dirty ballast. The constituent sources of dirty ballast are almost identical to the constituent sources in compensated fuel ballast systems. Therefore, sampling performed for compensated fuel ballast discharge can be used to predict the constituents in dirty ballast.
Soluble components of the fuel remaining in the tank mix with the seawater ballast during extended contact while in the compensated fuel or dirty ballast tanks. The fuels will normally be either Naval Distillate Fuel (NATO F-76) or Aviation Turbine Fuel (JP-5). In addition, the USCG uses biocide fuel additives in their fuel tanks to control bacterial growth in the fuel-water interface. 5,6 

### A ll these sources can contribute to the concentrations reported as total petroleum hydrocarbons and oil and grease. Specific fuel-based constituents can include benzene, toluene, ethylbenzene, xylene, cresols, phenols, and polycyclic aromatic hydrocarbons. 7



### Materials used in fuel and ballast systems on the ships, which include copper, nickel, iron and zinc, and the fuel or additives in the fuel such as biocides, can contribute to metal concentrations in the discharge. Based on compensated ballast sampling, the metals in the discharge can include copper, nickel, silver and zinc. The biocides used can contain naphtha and dioxaborinane compounds.
The potential priority pollutants in dirty ballast di scharge are 2-propenal, benzene, toluene, ethylbenzene, phenol, copper, nickel, silver, thallium, and zinc. The only bioaccumulator found in compensated ballast screening was mercury.

### Dirty Ballast 6 3.4 Concentrations
Knowledge of dirty ballasting systems and practices and use of compensated fuel ballast screening enables the characterization of dirty ballast discharge concentrations.
In support of the Compensated Ballast NOD report, a sampling effort was conducted during a refueling evolution. The results of the sampling effort are applicable to this NOD report because the same fuels are used in both compensated ballast and dirty ballast. Constituent concentrations are based on compensated ballast with the exception of oil concentrations, which are limited to 15 ppm by USCG practices and the use of OCMs and OWSs. The concentrations of detected priority pollutants, oil and grease, and a bioaccumulator are shown in Table 4.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Sec tion 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
An estimate of the maximum oil loading from dirty ballast for the three USCG vessel classes was calculated by first estimating the greatest potential discharge volume and assuming that the discharge contains the maximum allowable concentration of oil (15 ppm). In reality, the concentration is expected to be somewhat lower than this, due to the preballasting and deballasting procedures used by the USCG vessels, as described in Section 2.1. Using these values with existing information on vessel operating profiles, an annual oil mass loading value for each of the three USCG vessel classes was calculated.
The estimated maximum oil mass loading generated for each deballast event was calculated using the equation:

Using this equation, the estimated maximum oil loading generated in each deballasting event for WHEC 378 Class ships is:

(0.80)(208,000 gal)(3.785 L/gal)(15 mg/L)(10 -6 

### kg/mg)(2.205 lb/kg) = approximately 21 lbs

Similarly, the WMEC 210 Class and the WAGB 399 Class would generate approximately Estimated Maximum Oil Loading Generated by Deballasting Event in Pounds (lbs) = [80% fuel capacity (gal)] (3.785 L/gal)(15 mg/L)(10 -6 

### kg/mg)(2.205 lb/kg)

### Dirty Ballast 7 5 and 135 pounds of fuel for each deballasting event, respectively.
The annual maximum oil mass loading per class was calculated using the equation:

Usi ng this equation, the estimated maximum oil loading generated by deballasting per year for WHEC 378 Class ships is:

(21 lbs per deballast) (12 vessels in class) (7 deballasting events per year) = 1,764 lbs/yr

Given the assumed maximum concentration of 15 ppm, the maximum total mass loading for oil for all Coast Guard vessels is 2,704 pounds per year as shown in Table 2.

In a similar manner, the concentrations of each of the constituents shown in Table 4 (which are based on compensated ballast data for constituent concentrations) were used to calculate the mass loadings shown in Table 5.

4.2 Environmental Concentrations
Dirty ballast water discharged from armed forces vessels is expected to be similar to the compensated ballast discharge. In compensated ballast samples, copper, nickel, silver, and zinc exceeded Federal and the most stringent state WQC, and ammonia, benzene, phosphorous, thallium, total nitrogen, O&G, and 2-propenal concentrations exceeded the most stringent state WQC. 7 

### Table 4 is a summary of compensated ballast sample concentrations and applicable WQC.

4.3 Potential for Introducing Non-Indigenous Species
There is no significant potential for introducing, transporting, or releasing non-indigenous species with dirty ballast discharge. Navy and MSC policy requires that all dirty ballast be discharged beyond 50 n.m., and those USCG vessels with a combination of clean and dirty ballast systems also follow that practice. 2,3 

### The potential is mitigated by the fact that the three classes of USCG vessels with exclusively dirty ballast systems do not take on ballast while inport and normally ballast and deballast beyond 12 n.m., where they are less likely to take on nonindigenous species. In addition, the USCG has a policy that states if a cutter does ballast within 12 n.m. of land, a full-tank ballast exchange should be conducted twice while in open waters beyond 12 n.m., otherwise, hold the ballast and discharge it on the next voyage beyond 12 n.m.

Estimated Maximum Oil Loading Generated by Deballasting (lbs/yr) = (discharge amt. per event (lbs))(# vessels)(# deballasts/year) where, discharge amt. = pounds of oil per deballasting event # vessels = number of vessels in class # deballasts/year = number of deballasting events per year

### Dirty Ballast 8 Dirty ballast could also be discharged to a shore facility for processing. Most USCG vessels deballast prior to returning to port, at greater than 12 n.m. from shore.

5.0 CONCLUSIONS
Uncontrolled, dirty ballast has the potential to cause an adverse environmental effect because:

1) oil can be discharged in significant amounts above water quality criteria, and

2) oil in the discharge can also create a sheen that diminishes the appearance on surface waters.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information fr om various sources was obtained. Table 6 lists data sources for this NOD report.
Specific References

1. LT. Aivalotis, Joyce, USCG, April 15, 1997, to File.

2. UNDS Equipment Expert Meeting Minutes, Dirty Ballast, August 2, 1996.

3. Department of the Navy. Environmental and Natural Resources Programs Manual, OPNAVINST 5090.1B, Chapter 19-10, November 1994.

4. Department of the Navy. Carderock Division, Naval Surface Warfare Center. Summary of Dirty Ballast Questionnaire Responses for the Uniform National Discharge Standards (UNDS) Program. NSWCCD-TM-63-98/48. March 1998.

5. Military Specification MIL-S-53021A, Stabilizer Additive, Diesel Fuel, August 15, 1988.

6. LT Aivalotis, Joyce, USCG, Dirty Ballast Reply, 20 May, 1997.

7. UNDS Phase 1 Sampling Data Report, Volumes 1-13, October 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for

### Dirty Ballast 9 Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Dirty Ballast 10 Table 1. USCG Vessel Fuel Capacity and Consumption Data 8



### Vessel Class WMEC 210 WHEC 378 WAGB 399 Fuel Capacity (100%) (gal): F-76 (diesel) 52,236 208,000 1,349,920

Table 2. Maximum Annual Oil Mass Loading Estimate for USCG Vessels

Vessel Class No. of Vessels Oil per Deballast Event (lb) Deballast Events

per Year Maximum Oil

Discharged (lbs/yr) A 

### WMEC 210 16 5 5 400 WHEC 378 12 21 7 1764 WAGB 399 2 135 2 540
Notes: 

### Total: 2,704 lbs/yr A - based on maximum allowable OWS system discharge concentration limit (15 ppm),



### Table 3. USCG Vessel Dirty Ballast Discharge Duration

Vessel Class WMEC 210 WHEC 378 WAGB 399 Amount to Deballast (gal) A 

### 41,800 166,400 1,080,000 Direct Discharge (gal) 31,400 124,800 810,000 Direct Discharge (gpm) 250 250 250 Direct Discharge (hours) 2.1 8.3 54 OWS Processing (gal) 10,500 41,600 270,000 OWS Processing (gpm) 25 25 25 OWS Processing (hours) 7.0 27.7 180 Total Ballast Discharge Time (hours) B 

### 9.1 36 234
Notes: A - Amount to deballast is 80% of F-76 fuel capacity. B - Time estimates are maximum values per deballast event, based on maximum ballast volumes and moderate direct discharge flow rates.

### Dirty Ballast 11 Table 4. Estimated Dirty Ballast Constituent Concentrations that Exceed Federal and/or Most Stringent State Water Quality Criteria Based on Compensated Ballast Sampling Measurements

Constituent Maximum Dirty Ballast

Concentration ( μ g/L) Federal Acute WQC ( μ g/L) Most Stringent State

Acute WQC ( μ g/L) Ammonia as Nitrogen 300 none 6 (HI) A



### Benzene 153 none 71.28 (FL) 2-Propenal 203 none 18 (HI) Total Nitrogen 580 none 200 (HI) A 

### Total Phosphorous 340 none 25 (HI) A 

### Copper 86 2.4 2.4 (CT, MS) Mercury B 

### 0.00083 1.8 0.025 (FL, GA) Nickel 267 74 8.3 (FL, GA)

Silver 5.7 1.9 1.9 (CA, MS) Thallium 10.8 none 6.3 (FL) Zinc 4845 90 84.6 (WA) Oil & Grease 15000 visible sheen C 

### /15,000 D 

### 5000 (FL)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995)
A - Nutrient criteria are not specified as acute or chronic values. B - Mercury was not found in excess of WQC; concentration is shown only because it is a bioaccumulator. C - Discharge of Oil. 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. D - International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS).

CA= California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Dirty Ballast 12 Table 5. Estimated Maximum Annual Mass Loadings for Dirty Ballast Constituents that Exceed Water Quality Criteria

Constituent Annual Mass Loading (lb/yr) Ammonia A 

### 54.2 Benzene A 

### 27.6 Phosphorous A 

### 61.4 Total Nitrogen 105 2-Propenal 36.6 Copper A 

### 15.5 Nickel A 

### 48.1

Silver A 

### 1.0 Thallium 1.95 Zinc A 

### 872.1 Mercury A,B 

### 0.00015 Oil & Grease C 

### 2704
Notes: A - Based on constituent concentrations found in compensated ballast water B - Mercury was not found in excess of WQC; mass loading is shown only because it is a bioaccumulator. C - Oil and Grease mass loading based on maximum allowable OWS system discharge concentration limit (15 ppm), not on compensated ballast sampling results. 80% of the ship’s fuel capacity is always used for ballast anytime a ship takes on ballast water.

### Dirty Ballast 13 Table 6. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation Data Call Responses X

2.2 Releases to the Environment Data Call Responses X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality Data Call Responses X 3.2 Rate Data Call Responses X 3.3 Constituents Data Call Responses X X 3.4 Concentrations Data Call Responses X X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Distillation and Reverse Osmosis Brine 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Distillation and Reverse Osmosis Brine

### Distillation and Reverse Osmosis Brine 2 2.0 DISCHARGE DESCRIPTION
This section describes the distillation and reverse osmosis (RO) brine discharge and it includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Distilling and RO plants, known as “water purification plants,” generate freshwater from seawater for a variety of shipboard applications. These include potable water for drinking and hotel services (e.g., sanitary, laundry, and food preparation) and high-purity feedwater for boilers. Vessels with steam turbine propulsion plants are equipped with large boiler systems that require significant amounts of high-purity feedwater for generating high-pressure steam to operate the ship's engines. Vessels also need low-pressure steam for producing hot water and for heating.

2.1.1 Distilling Plants
Distilling plants, also known as evaporators, are used to distill freshwater from seawater. Non-volatile seawater components, such as inorganic and organic solids (dissolved and suspended), remain in the plant and become concentrated. The mixture of concentrated seawater components that remain and the constituents leached from material in the plant is known as brine and is discharged overboard.
There are two types of distilling plants used on Armed Forces vessels. One type uses low-pressure steam as the heat source and generally operates under vacuum. Figure 1 is a diagram of a two-stage flash-type distilling plant. The other type, vapor compression, uses a compressor to "drive" the evaporation process. Both types produce similar brine discharges.
The heat that is essential to the distilling process is transmitted to the influent seawater through one or more heat exchangers. The heat exchangers consist of a series of metal tubes or plates enclosed in a metal casing. They are designed to segregate the heat source fluid (steam in the case of distilling plants) from the fluid to which the heat is transmitted (influent seawater) while providing as much thermal contact through the metal surfaces as possible. This is accomplished by having a high density of tubes or plates.
Condensate, which is segregated from distillate and brine, is produced from the generating steam when it is cooled by distilling plant heat transfer surfaces. The condensate can be directed to a collection tank along with condensate from other heating devices (e.g., ventilation heaters) for reuse in the ship's boilers. The condensate that is not reused in the boilers is a source of non-oily machinery wastewater, as discussed in the NOD report for that discharge.
During the distilling process, inorganic seawater constituents form a scale on the distilling plant heat transfer surfaces. Anti-scaling compounds are continuously injected into the influent seawater to control the scaling. Nevertheless, the surfaces will gradually foul from

### Distillation and Reverse Osmosis Brine 3 scaling over extended periods and periodic cleaning is required to restore flow and heat transfer efficiency.
Citric acid cleaning can be done at sea or in port. At-sea acid cleaning is done during distillation by injecting the citric acid solution into the influent seawater. The citric acid reacts with the distilling plant scale to form soluble byproducts that are discharged with the distilling plant brine. Carbon dioxide is also given off by this reaction and is removed by the distilling plant air ejector.
In-port ci tric acid cleaning is done every 5 to 7 years on Navy distilling plants. The cleaning solution is recirculated between the distilling plant and a tank truck on the pier. The spent cleaning solution is disposed at an off-site shore facility. 1



### 2.1.2 RO Plants
RO plants separate freshwater from seawater by using semi-permeable membranes as a physical barrier. The RO membrane retains a large percentage of suspended and dissolved constituents, allowing freshwater to pass through. The retained substances become concentrated into brine. Shipboard RO plants produce lower-purity freshwater than distilling plants, with total dissolved solids (TDS) concentrations two orders of magnitude greater than distilling plant distillate

. 2



### Because RO plants operate at ambient temperatures, scaling is not a concern. Therefore, chemicals are not used in RO plants for either scaling suppression or cleaning.

2.2 Releases to the Environment
The overboard discharge from water purification plants on vessels is RO and di stilling plant brine. The brine primarily consists of seawater, but can also contain materials from the purification plants and anti-scaling treatment chemicals. RO and distilling processes separate a relatively small proportion of freshwater from the influent seawater, returning the slightly more concentrated brine effluent to the sea. The discharged brine from distilling plants is at elevated temperatures, typically 100 to 120 °F.
The citric acid cleaning solutions that are used to periodically clean the distilling plants are either collected on-site after shoreside cleaning or discharged overboard beyond 12 n.m. after at sea cleaning.

2.3 Vessels Producing the Discharge
There are currently 541 vessels of the Armed Forces equipped with water purification plants. Four hundred fifty-seven vessels have distilling plants and the remainder have RO plants. Table 1 provides a list of Navy, MSC, USCG, and Army vessels that produce this discharge. 3

### Distillation and Reverse Osmosis Brine 4 3.0 DISCHARGE CHARACTERISTICS
This section contains q ualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
The distilling plant on a steam-propelled vessel can be operated any time the vessel’s boilers are operating. MSC steam-propelled ships typically operate one distiller while in port,except for ships on reduced operating status. As a result, discharge of brine from steampropelled vessels can occur in port, at sea, and while transiting to and from port. However, diesel- and gas-turbine-propelled vessels with distilling plants, and all vessels with RO plants seldom operate their water purification plants in port or while transiting coastal waters less than 12 nautical miles (n.m.) from shore.
For Navy vessels, brine discharge within 12 n.m. is from the production of boiler feedwater. Navy vessels do not produce potable water within 12 n.m., except during extended operations.

3.2 Rate
While the existing Navy fleet has water purification plants of many sizes and capacities, current naval ship design practice is to use standardized water purification plants of two capacities: 12,000-gallons per day (gpd) distilling and RO plants and 100,000-gpd distilling plants. Multiple water purification plants will be used to achieve capacities of up to 450,000- gpd. For example, a destroyer's RO system may include two 12,000-gpd plants, while the new LPD 17 Class amphibious transport dock vessels require five 12,000-gpd plants to meet freshwater demand. Aircraft carriers have multiple 100,000-gpd distilling plants.
The volume of brine discharged from water purification plants depends on the type of plant. When operating, distilling plants are typically run at full capacity, even when the demand for potable water is low. Excess distillate is discharged directly overboard. Based on operating experience, distilling plants generate 17 gallons of brine for every gallon of fresh water. RO plants generate 4 gallons of brine for every gallon of fresh water. 3 

### These brine production factors can be used to calculate the water purification plant brine flow rate in gallons per day:

A single distilling plant on a typical Navy DD 963 Clas s destroyer produces 8,000 gpd of freshwater. 4 

### Therefore:

(8,000 gpd freshwater) (17) = 136,000 gpd brine discharge Water Purification Plant Brine Flow Rate in gallons per day (gpd) = (total freshwater flow in gpd) (brine production factor)

### Distillation and Reverse Osmosis Brine 5 A single RO plant on a typical Navy MHC 51 coastal minehunter produces 1,600 gpd of freshwater. 3 

### Therefore:

(1,600 gpd freshwater) (4) = 6,400 gpd brine discharge
Current Navy vessel water purification plant operating practice is for steam-propelled ships to operate one distilling plant in port for one to five days before departure (to fill boiler feed water tanks) and while transiting through coastal waters less than (<) 12 n.m.). Submarines are normally supplied boiler feed water by shore or a tender while in port. The distilling plants on all these vessels can be operated at full capacity while at sea (greater than (>) 12 n.m.)).
Table 1 shows estimated distilling and RO plant brine discharge quantities for various vessel classes. The estimates are based on available information regarding the number of vessels in each class, type and capacity of water purification plant(s), vessel operating schedules (number of transits and days in port per year), and water purification plant operating practices while in port, in transit (<12 n.m.) and at sea (>12 n.m.). The assumptions and formulas used to calculate the brine discharge estimates are summarized in the notes section of Table 1, and include four hours per vessel transit in coastal waters. The assumptions also include operation of one distilling plant to produce boiler feedwater for four hours prior to departure from port in the case of submarines. 3 

### Surface steam-powered vessels may operate a distilling plant for as much as three days prior to departure from port (i.e., every second transit)

. 3,5 

### The calculation of the total annual brine discharge within 12 n.m. of shore consists of an in-port component and a transit component, which are added together. The formula for a Navy vessel class is:

A sample calculation for the LSD 36 Class dock landing ship is as follows:

(5 ships) (510,000 gal/day/ship) (26 transits/yr) ((3 days before each transit /2) +

(4/24 day per transit)) = 111 million gals/yr

Table 1 lists the results of the above calculation for all vessels of the Armed Forces. A total of approximately 2.47 billion gallons of distilling and RO plant brine discharges occur annually within 12 n.m. from shore. Of this, approximately 1.84 billion gallons is discharged in port and 620 million gallons is discharged in transit within 12 n.m. These calculations overestimate the actual discharge rate because steam-powered surface ships can operate a distilling plant for less than three days prior to leaving port.
The volume of influent seawater to a distilling plant can be estimated using the ratio of brine produced to gallons of freshwater produced, or 17:1. This ratio indicates that for every 18 Annual Flow within 12 n.m. (gals/yr) = (number of vessels in class) (single distiller brine flow in gal/day/vessel) (number of distillers/vessel) (number of transits/yr) ((3 days before each transit/2 transits) + (4 hours/transit X 1 day/24 hours))

### Distillation and Reverse Osmosis Brine 6 gallons of seawater introduced into a distilling plant, 17 gallons of brine is produced. Knowing that a total of approximately 2.47 billion gallons of distilling and RO plant brine discharges occur annually within 12 n.m. of shore, the following calculation can be made to approximate the total annual volume of seawater influent:

(18 gallons of seawater/17 gallons of brine) (2.47 billion gallons of brine)

= 2.62 billion gallons seawater

Therefore, the influent flow rate is approximately 2.62 billion gallons, and the effluent flow rate is approximately 2.47 billion gallons

3.3 Constituents
The three sources of the constituents of water purification plant discharge are: 1) influent seawater; 2) anti-scaling treatment chemicals; and 3) the purification plant components, including heat exchangers, casings, pumps, piping and fittings. The primary constituents of the brine discharge are identical to those in seawater. These include non-volatile dissolved and suspended solids, and metals.
Distilling plants are made primarily of metal alloys that are corroded by seawater, particularly at the elevated temperatures at which these plants operate. The metal alloys used for heat transfer surfaces and other components include copper-nickel alloys, nickel/chromium alloys, stainless steel, titanium, brass, and bronze. Based on the metallurgical composition of these alloys, the corrosion process could be expected to introduce copper, chromium, nickel, and zinc into the brine. The corrosion effect on the brine discharge metal loadings is less of a concern for the RO plants, with non-metallic membranes and ambient seawater operating temperatures.
The distilling plant anti-scaling compound used in Navy surface ships is Distiller Scale Preventive Treatment Formulation. The military specification requires anti-scaling compound products to contain organic polyelectrolytes such as polyacrylates, and an antifoaming agent in aqueous solution. 6 

### The polyelectrolyte chelates (ties-up) inorganic constituents (calcium, magnesium, metals) to prevent them from depositing on equipment surfaces. Equipment supplier material safety data sheets (MSDSs) indicate that the products contain about 10% to 20% polyacrylate and low levels of antifoaming chemicals (e.g., one product contains 1% polyethylene glycol). Ethylene oxide was identified on two of the MSDSs as potentially present in trace amounts. One of the MSDSs also indicated that acrylic acid, acetaldehyde, and 1,4- dioxane can also be present at trace levels. 7



### Distilling plant influent and effluent were sampled for materials that had a potential for being in the discharge. An aircraft carrier, an amphibious assault ship, and a landing ship dock were sampled. 8 

### Based on the brine generation process, system designs, and analytical data available, analytes in the metals, organics, and classicals classes were tested. In addition, Bis(2- ethylhexyl) phthalate, a semi-volatile organic compound, was specifically tested for, since it is not covered in the three aforementioned analyte classes, but is a standard parameter in sampling

### Distillation and Reverse Osmosis Brine 7 for semi-volatile constituents. The results of the sampling are provided in reference 8. Table 2 provides a list of all constituents and their concentrations that were detected in the discharge. In terms of thermal effects, this discharge is expected to be warmer than ambient water temperatures with a maximum overboard discharge temperature of 120 o 

### F.
Priority pollutants that were detected included copper, iron, lead, nickel, and zinc; and the semi-volatile organic compound bis(2-ethylhexyl) phthalate. No bioaccumulators were detected.

3.4 Concentrations

The concentrations of detected constituents are listed in Tables 2 and 3.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria.Section 4.3 discusses thermal effects. In Section 4.4, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
The water purification plant brine annual discharge flow rate (Section 3.2) and constituent concentration data (Tables 2 and 3) were used to develop brine constituent effluent mass loading estimates. Similarly, constituent influent mass loadings were found by using the seawater annual flow rate (Section 3.2) and constituent concentration data (Tables 2 and 3).
The following general formula was used to determine influent mass loading and effluent mass loading:

For instance, the estimated effluent mass loading for copper generated by distilling plant brine discharge is:

(217.38 μg/L) (2.47 billion gal/yr) (3.7854 L/gal)) (2.2 lb/kg) (10 -9 

### kg/μg) = 4471.48 lbs/yr

The estimated influent mass loading calculation for copper is:

(83.51 μ g/L) (2.62 billion gal/yr) (3.7854 L/gal) (2.2 lb/kg) (10 -9 

### kg/ μ g) = 1822.11 lbs/yr Mass Loading (lbs/yr) = (concentration in μg/L) (flow rate in gal/yr) (3.7854 L/gal) (2.2 lb/kg) (10 -9 

### kg/μg)

### Distillation and Reverse Osmosis Brine 8 The mass loading of the discharge was then determined by subtracting the influent mass loading from the effluent mass loading for each constituent. Concentration values and mass loadings are provided in Table 2. Log-normal average concentrations were used because the sample data were assumed to approximate a log-normal distribution.

T he mass loadings were calculated based upon flow from all distilling and RO plants and assuming constituent concentrations in distiller and RO effluent are equal. Calculations using this assumption are expected to overestimate mass loadings because constituent concentrations will be lower in RO effluent because the operating temperature is lower, resulting in less corrosion. Table 3 provides a water purification plant brine discharge mass loading summary.

4.2 Environmental Concentrations

Table 4 iden tifies distilling plant brine constituents that were detected at or above their respective Federal or most stringent state water quality criteria (WQC). Copper and zinc exceeded both Federal and most stringent state WQC. Nitrogen (as ammonia, nitrate/nitrite, and total kjeldahl nitrogen), phosphorous, iron, lead, nickel, and zinc exceed the most stringent state WQC.

4.3 Thermal Effects
The potential for distilling plant brine discharge to cause thermal environmental effects was evaluated by modeling the thermal plume generated and then comparing it to plumes representing state thermal discharge requirements. Thermal effects of distilling plant brine were modeled using the Cornell Mixing Zone Expert System (CORMIX) to estimate the plume size and temperature gradients in the receiving water body. The model was run under conditions that would overestimate the size of the thermal plume (minimal wind, slack tide) for the largest generator of distilling plant brine (aircraft carrier) and for a typical distillation brine generator (cruiser). The plume characteristics were compared to thermal mixing zone criteria for Virginiaand Washington. Other coastal states require that thermal mixing zones be established on a caseby-case basis.
The Washington thermal regulations state that when natural conditions exceed 16 °C, no temperature increases will be allowed that will raise the receiving water temperature by greater than 0.3 °C. The mixing zone requirements state that mixing zones shall not extend for a distance greater than 200 feet plus the depth of the water over the discharge point, or shall not occupy greater than 25% of the width of the water body. The Virginia thermal regulations state that any rise above natural temperature shall not exceed 3 °C. Virginia requires that the plume shall not constitute more than one-half of the receiving watercourse, and shall not extend downstream at any time a distance more than five times the width of the receiving of water body at the point of discharge.

The airc raft carrier distilling plant brine flow rate was determined to be 24,083 gallons per hour at a temperature of 104 ° F while the cruiser flow parameters were 120 °F and 6,375 gallons per hour for temperature and flow rate, respectively. The ambient water temperature was

### Distillation and Reverse Osmosis Brine 9 dependent upon location and varied between 40 and 60 °F. Both modeled discharges were continuous and were assumed to emanate from a 6-inch diameter pipe located at the bottom of the hulls. The results of this modeling are provided in Table 5. 9



### Some of the model parameter assumptions lead to a reduced amount of mixing within the harbor. The assumptions are:



## • wind velocity is at a minimum (1 m/s);



## • the discharge will occur during a simulated slack tide event, using a minimum water body velocity (0.03 m/s);



## • the average depth of water at the pier is 40 feet.
Using the above parameters and assumptions, distilling plant brine discharges from Armed Forces vessels do not exceed state thermal mixing zone criteria.

4.4 Potential for Introducin g Non-Indigenous Species
The potential for introducing, transporting, or releasing non-indigenous species with this discharge is low because the maximum retention time of water in these plants is short; therefore the effluent is discharged in the same area from which the influent seawater is taken.

5.0 CONCLUSIONS
The discharge from vessel water purification plants has the potential to cause adverse environmental effects because significant amounts of metals are discharged at concentrations above WQC.

6.0 DATA SOURCES AND REFERENCES
Table 6 lists the data source of the information presented in each section of this NOD report.
Specific References

1. Personal communication between Carl Geiling, Malcolm Pirnie, Inc., and Chief Luedtke, USS Carter Hall (LSD 50), 23 January, 1997.

2. Aerni, Walter, NAVSEA. Elements Present in Water, 19 November 1997, Greg Kirkbride, M. Rosenblatt & Son, Inc.

3. UNDS Equipment Expert Meeting Minutes - Evaporator Brine & Reverse Osmosis (RO) Plant. August 27, 1996.

### Distillation and Reverse Osmosis Brine 10 4. Aqua-Chem Marine, Inc. Marine Multi-Stage Flash Distilling Plants.

5. U.S. Navy. Commander, Naval Air Forces Pacific. Implementation of Uniform National Discharge Standards. Letter to SEA 00T-E1, 17 December 1996.

6. Specification for Distiller Scale Preventive Treatment Formulations (Metric), DOD-D24577(2), 19 December, 1986.

7. Ashland Chemical Company. Material Safety Data Sheets - Ameroyal Evaporator Treatment, January 5, 1996.

8. UNDS Phase 1 Sampling Data Report, Volumes 1-13, October 199 7.

9. NAVSEA. Thermal Effects Screening of Discharges from Vessels of the Armed Services. Versar, Inc. July 3, 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.

### Distillation and Reverse Osmosis Brine 11 Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.
UNDS Ship Database, August 1, 1997.

### Distillation and Reverse Osmosis Brine 12 Figure 1. Diagram of a Two Stage Flash-Type Distilling Plant

### Distillation and Reverse Osmosis Brine 13 Table 1. Water Purification Plant Discharge Summary

VESSEL CLASSIFICATION INFORMATION WATER PURIFICATION SYSTEM TRANSIT ANNUAL TYPE TOTAL TOTAL INFORMATION BRINE WASTEWATER NO. PRO- AND H20 BRINE DAYS DISCHARGE CLASS ARMED CLASS OF PULSION NO. OF FLOW FLOW TRAN- IN (million gals/year) ID NO. SVCE NAME VESSEL TYPE VESSELS SYSTEM PLANTS (gpd) (gpd) SITS PORT IN-PORT IN TRANSIT >12 n.m. TOTAL AE 26 MSC Kilauea Ammunition Ship 5 Steam Distill / 2 32,000 544,000 8 26 35.4 1.8 918.5 955.6 AE 26 MSC Kilauea Ammunition Ship (ROS) 3 Steam Distill / 2 32,000 544,000 8 26 9.8 1.1 551.1 562.0 AFS 1 (1) MSC Mars Combat Store Ship (ROS) 1 Steam Distill / 2 24,000 408,000 14 148 4.3 0.5 87.6 92.3 AFS 1 (3,5,6,7) MSC Mars Combat Store Ship 4 Steam Distill / 2 32,000 544,000 14 148 161.0 2.5 467.1 630.7 AFS 8 MSC N/A Combat Store Ship 3 Steam Distill / 2 32,000 544,000 14 148 120.8 1.9 350.3 473.0 AG 194 MSC Vanguard Navigation Research Ship 1 Steam Distill / 1 16,000 272,000 20 151 41.1 0.9 57.3 99.3 AG 195 MSC Hayes Sound Trials Ship 1 Diesel RO 2 10,000 40,000 20 151 0 0 8.4 8.4 AGM 22 MSC Converted Haskell Missile Range Instrumentation Ship 1 Steam Distill / 2 24,000 408,000 8 133 27.1 0.3 94.1 121.5 AGOS 1 MSC Stalwart Ocean Surveillance Ship 5 Diesel Distill / 2 6,000 102,000 8 70 0 0 149.8 149.8 AGOS 19 MSC Victorious Ocean Surveillance Ship 4 Diesel Distill / 2 6,000 102,000 10 107 0 0 104.6 104.6 AGS 26 MSC Silas Bent and Wilkes Surveying Ship 2 Diesel Distill / 2 6,000 102,000 12 44 0 0 65.1 65.1 AGS 45 MSC Waters Surveying Ship 1 Diesel Distill/ 2 15,324 260,508 2 7 0 0 93.2 93.2 AGS 51 MSC John McDonnell Surveying Ship 1 Diesel RO/ 2 4,000 16,000 12 96 0 0 4.3 4.3 AGS 52 MSC John McDonnell Surveying Ship 1 Diesel RO/ 3 6,000 24,000 12 96 0 0 6.4 6.4 AGS 60 MSC Pathfinder Surveying Ship 4 Diesel RO/ 2 8,000 32,000 NA NA 0 0 0 NA AH 19 MSC Mercy Hospital Ship (ROS) 2 Steam Distill/ 4 300,000 5,100,000 4 184 15.3 1.7 1839.4 1856.4 AKR 287 MSC Algol Vehicle Cargo Ship (ROS) 8 Steam NA NA NA 6 109 NA NA NA NA AKR 295 MSC NA Vehicle Cargo Ship (ROS) 2 Diesel Distill/ 1 9,511 161,687 NA NA 0 0 NA NA AKR 296 MSC NA Vehicle Cargo Ship (ROS) 1 Diesel Distill/ 4 8,200 139,400 NA NA 0 0 NA NA ARC 7 MSC Zeus Cable Ship 1 Diesel Distill/ 2 18,000 306,000 4 8 0 0 109.0 109.0 AO 187 MSC Henry J. Kaiser Oiler 12 Diesel Distill 2 20,000 340,000 12 78 0 0 1162.8 1162.8 ATF 166 MSC Powhatan Fleet Ocean Tug 7 Diesel RO/ 1 2,000 8,000 32 127 0 0 13.0 13.0 AO 177 NAVY Jumboised Cimarron Oiler 5 Steam Distill/ 2 12,000 204,000 20 188 15.3 1.7 177.1 194.1 AOE 1 NAVY Sacramento Fast Combat Support Ship 1 Steam Distill/ 2 100,000 1,700,000 22 183 28.1 3.1 303.2 334.3 AOE 1 (2-4) NAVY Sacramento Fast Combat Support Ship 3 Steam Distill/ 2 80,000 1,360,000 22 183 67.3 7.5 727.6 802.4 AOE 6 NAVY Supply Fast Combat Support Ship 3 Gas Distill/ 2 60,000 1,020,000 12 114 0 0 761.9 761.9 ARS 50 NAVY Safeguard Salvage Ships 3 Diesel Distill/ 2 8,000 136,000 44 208 0 0 61.1 61.1 ARS 50 (ARS 52) NAVY Safeguard Salvage Ships 1 Diesel Distill/ 3 12,000 204,000 44 208 0 0 30.5 30.5 AS 33 NAVY Simon Lake Submarine Tender 1 Steam Distill/ 2 100,000 1,700,000 12 229 15.3 1.7 227.8 244.8

### Distillation and Reverse Osmosis Brine 14 VESSEL CLASSIFICATION INFORMATION WATER PURIFICATION SYSTEM TRANSIT ANNUAL TYPE TOTAL TOTAL INFORMATION BRINE WASTEWATER NO. PRO- AND H20 BRINE DAYS DISCHARGE CLASS ARMED CLASS OF PULSION NO. OF FLOW FLOW TRAN- IN (million gals/year) ID NO. SVCE NAME VESSEL TYPE VESSELS SYSTEM PLANTS (gpd) (gpd) SITS PORT IN-PORT IN TRANSIT >12 n.m. TOTAL AS 39 NAVY Emory S Land Submarine Tender 3 Steam Distill/ 2 100,000 1,700,000 12 293 45.9 5.1 357.0 408.0 CG 47 NAVY Ticonderoga Guided Missile Cruiser 27 Gas Distill/ 2 24,000 408,000 24 166 0 0 2126.1 2126.1 CGN 36 NAVY California Guided Missile Cruiser 2 Nuclear Distill/ 2 36,000 612,000 22 143 20.2 2.2 265.0 287.4 CGN 38 NAVY Virginia Guided Missile Cruiser 1 Nuclear Distill/ 2 36,000 612,000 22 143 10.1 1.1 132.5 143.7 CV 59 (CV 62) NAVY Forrestal Aircraft Carrier 1 Steam Distill/ 5 380,000 6,460,000 14 137 27.1 3.0 1450.3 1480.4 CV 63 NAVY Kitty Hawk Aircraft Carrier 1 Steam Distill/ 5 380,000 6,460,000 14 137 27.1 3.0 1450.3 1480.4 CV 63 (CV 64) NAVY Kitty Hawk Aircraft Carrier 1 Steam Distill/ 6 400,000 6,800,000 14 137 23.8 2.6 1526.6 1553.0 CVN 65 NAVY Enterprise Aircraft Carrier 1 Nuclear Distill/ 5 350,000 5,950,000 12 76 21.4 2.4 1701.7 1725.5 CV 67 NAVY Kennedy Aircraft Carrier 1 Steam Distill/ 5 450,000 7,650,000 14 137 32.1 3.6 1717.4 1753.1 CVN 68 NAVY Nimitz Aircraft Carrier 7 Nuclear Distill/ 4 400,000 6,800,000 14 147 249.9 27.8 10210.2 10487.9 DD 963 NAVY Spruance Destroyer (Typical) 27 Gas Distill/ 2 16,000 272,000 24 178 0 0 1329.3 1329.3 DD 963 NAVY Spruance Destroyer (DD 963 & DD 964) 2 Gas RO/ 2 24,000 96,000 24 178 0 0 34.8 34.8 DD 963 NAVY Spruance Destroyer (DD 992) 1 Gas Distill/RO 3 25,000 308,000 24 178 0 0 55.7 55.7 DD 997 NAVY Spruance Destroyer 1 Gas Distill/ 2 24,000 408,000 24 178 0 0 73.8 73.8 DDG 51 NAVY Arleigh Burke Guided Missile Destroyer 18 Gas RO/ 2 24,000 96,000 22 101 0 0 446.7 446.7 DDG 993 NAVY Kidd Guided Missile Destroyer 4 Gas Distill/ 2 20,000 340,000 24 175 0 0 250.2 250.2 FFG 7 NAVY Oliver Hazard Perry Guided Missile Frigate 43 Gas Distill/ 2 8,000 136,000 26 167 0 0 1119.9 1119.9 LCC 19 NAVY Blue Ridge Amphibious Command Ship 2 Steam Distill/ 2 100,000 1,700,000 16 179 40.8 4.5 618.8 664.1 LHA 1 NAVY Tarawa Amphibious Assault Ship 5 Steam Distill/ 2 140,000 2,380,000 18 173 160.7 17.9 2231.3 2409.8 LHD 1 NAVY Wasp Amphibious Assault Ship 4 Steam Distill/ 2 200,000 3,400,000 26 185 265.2 29.5 2359.6 2654.3 LPD 4 NAVY Austin Amphibious Transport Dock 3 Steam Distill/ 2 60,000 1,020,000 22 178 50.5 5.6 555.4 611.5 LPD 7 NAVY Austin Amphibious Transport Dock 3 Steam Distill/ 2 60,000 1,020,000 24 188 55.1 6.1 523.3 584.5 LPD 14 NAVY Austin Amphibious Transport Dock 2 Steam Distill/ 2 60,000 1,020,000 22 192 33.7 3.7 341.7 379.1 LPH 2 NAVY Iwo Jima Amphibious Assault Helicopter Carrier 2 Steam Distill/ 2 100,000 1,700,000 22 186 56.1 6.2 589.9 652.2

LSD 36 NAVY Anchorage Dock Landing Ship 5 Steam Distill/ 2 60,000 1,020,000 26 215 99.5 11.1 731.9 835.4 LSD 41 NAVY Whidbey Island Dock Landing Ship 8 Diesel Distill/ 2 60,000 1,020,000 26 170 0 0 1538.2 1538.2 LSD 49 NAVY Harpers Ferry Dock Landing Ship 3 Diesel Distill/ 2 60,000 1,020,000 NA NA 0 0 NA NA MCM 1 (1-10) NAVY Avenger Mine Countermeasure Vessel 10 Diesel Distill/ 2 4,000 68,000 56 232 0 0 80.9 80.9 MCM 1 (11-14) NAVY Avenger Mine Countermeasure Vessel 4 Diesel Distill/RO 2 6,000 76,000 56 232 0 0 36.2 36.2

### Distillation and Reverse Osmosis Brine 15 VESSEL CLASSIFICATION INFORMATION WATER PURIFICATION SYSTEM TRANSIT ANNUAL TYPE TOTAL TOTAL INFORMATIO N BRINE WASTEWATER

NO. PROP- AND H20 BRINE DAYS DISCHARGE CLASS ARMED CLASS OF ULSION NO. OF FLOW FLOW TRAN- IN (million gals/year) ID NO. SVCE NAME VESSEL TYPE VESSELS SYSTEM PLANTS (gpd) (gpd) SITS PORT IN-PORT IN TRANSIT >12 n.m. TOTAL MHC 51 NAVY Osprey Coastal Minehunter Vessel 12 Diesel RO/ 1 1,600 6,400 56 232 0 0 9.1 9.1 MCS 12 NAVY Converted Iwo Jima MCM Support Ship 2 Steam Distill / 2 100,000 1,700,000 22 186 56.1 6.2 589.9 652.2 PC 1 NAVY Cyclone Coastal Defense Ship 13 Diesel RO/ 3 1,200 4,800 36 105 0 0 15.7 15.7 SSN 637 NAVY Sturgeon Submarine 13 Nuclear Distill / 1 8,000 136,000 14 NA 2.1 4.1 NA NA SSN 640 NAVY Ben Franklin Submarine 2 Nuclear Distill / 1 8,000 136,000 14 NA 0.3 0.6 NA NA SSN 671 NAVY Narwhal Submarine 1 Nuclear Distill / 1 8,000 136,000 14 NA 0.2 0.3 NA NA SSN 688 NAVY Los Angeles Submarine 56 Nuclear Distill / 1 10,000 170,000 14 NA 11.1 22.2 NA NA SSBN 726 NAVY Ohio Submarine 17 Nuclear Distill / 1 12,000 204,000 22 NA 6.4 12.7 NA NA WAGB 399 USCG Polar Icebreaker 2 Diesel Distill / 2 16,000 272,000 NA NA 0 0 NA NA WHEC 378 USCG Hamilton/Hero Class High Endurance Cutter 12 Diesel Distill / 1 10,000 170,000 26 151 0 100.0 329.9 429.9 WIX 295 USCG Eagle Sailing Ship (Barque, Training) 1 Diesel RO/ 2 7,600 30,400 24 265 0 0 2.9 2.9 WLB 180B USCG Balsam Seagoing Tenders 2 Diesel RO/ 1 500 2,000 10 120 0 0.0 0 0.0 WLB 225 USCG Juniper Seagoing Tenders 2 Diesel Distill / 1 1,000 17,000 NA NA 0 0 NA NA WMEC 210A USCG Reliance Medium Endurance Class 5 Diesel Distill / 1 3,000 51,000 18 149 0 59.9 60.0 119.9 WMEC 210B USCG Reliance Medium Endurance Class 11 Diesel Distill / 1 3,000 51,000 18 149 0 59.9 60.0 119.9 WMEC 213 USCG Diver Medium Endurance Class 1 Diesel Distill / 1 3,000 51,000 18 98 0 7.0 20.0 27.0 WMEC 230 USCG Storis Medium Endurance Class 1 Diesel Distill / 1 3,000 51,000 22 167 0 2.0 8.0 10.0 WMEC 270A USCG Bear Medium Endurance Class 4 Diesel Distill / 1 6,000 102,000 14 164 0 83.0 100.0 183.0 WMEC 270B USCG Bear Medium Endurance Class 9 Diesel Distill / 1 6,000 102,000 14 164 0 83.0 100.0 183.0 WPB 110A USCG Island Patrol Craft 16 Diesel RO/ 1 300 1,200 4 72 0 6.0 0 6.0 WPB 110B USCG Island Patrol Craft 21 Diesel RO/ 1 300 1,200 14 137 0 6.0 0 6.0 WPB 110C USCG Island Patrol Craft 12 Diesel RO/ 1 300 1,200 10 157 0 3.0 0 3.0 LSV ARMY NA Logistics Support Vessel 6 Diesel Distill/ 2 2,000 34,000 40 150 0 0.0 41.8 41.8 LCU-2000 ARMY NA 2000 Class Landing Craft Utility 35 Diesel RO/ 2 800 32,000 6 275 0 0.0 9.9 9.9 LT-128 ARMY NA 128 ft Large Tug 6 Diesel RO/ 2 600 2,400 10 245 0 0.0 1.7 1.7 TOTALS: 541 1,480 10,957 1,836 616 43,575 46,027

### Distillation and Reverse Osmosis Brine 16 Notes: 1. NA = Information not available; distilling plant assumed. 2. One transit = travel from sea to port, or from port to sea. 3. General Assumptions (typical or average per fleet): a. Vessel and submarine travel time in coastal waters (<12 n.m.) is 4 hours per transit. b. Steam propelled ships operate one distilling plant unit in port for an average of 3 days (4 hours for submarines) prior to departure (to fill boiler feed water tanks) and while transiting outbound through coastal waters. Ship distilling plants are operated at full capacity while at sea (>12 n.m.). c. Diesel and gas turbine propelled ships do not operate water purification systems in port or while transiting coastal waters. d. Daily Brine Flow = H20 Design Capacity times 17 for evaporation systems and 4 for RO systems.. 4. MSC Water Purification Operating Criteria a. Steam propelled MSC ships operate at least one distilling plant unit at all times while in port, except for ships in reduced operating status (ROS). 5. Annual Brine Discharge Formulas: a. IN-PORT (steam propelled) 1.) Navy and MSC ROS 2.) MSC NON-ROS b. IN-TRANSI T (steam propelled) c. >12 n.m. (all ships) 6. Out of the 18 DDG51 Class ships currently in commission, DDG 52 through 63 do not have RO units. They have vapor compression distillers. There are plans to replace them with ROs in the future.

### Distillation and Reverse Osmosis Brine 17 Table 2. Summary of Detected Analytes

Constituent Log Normal

Mean Frequency

of Detection Minimum

Concentration Maximum

Concentration Log Normal

Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Influent Mass

Loading Effluent Mass

Loading Mass Loading

(Effluent - Influent) Evaporator Brine Influent Evaporator Brine Effluent Metals ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) (lbs/yr) (lbs/yr) Aluminum Dissolved 34.54 1 of 3 BDL 61.3 41.65 1 of 3 BDL 187 753.63 856.73 103.1 Total 370.83 2 of 3 BDL 2390 938.56 3 of 3 493.5 1380 8091.16 19306.05 11214.89 Arsenic Dissolved
~ ~ ~ ~ 2.93 2 of 3 BDL 10.9
~ 60.27 60.27 Total 1.71 1 of 3 BDL 2 2.18 1 of 3 BDL 1 37.31 44.84 7.53 Barium Dissolved 12.51 3 of 3 7.1 17.8 21.21 3 of 3 17.5 23.8 272.96 436.29 163.33 Total 22.18 3 of 3 16.6 27.5 30.15 3 of 3 27 34.35 483.95 620.18 136.23 Boron Dissolved 2368.67 3 of 3 2140 2810 2472.67 3 of 3 2270 2775 51682.12 57033.44 5351.32 Total 2466.79 3 of 3 2030 3160 2588.76 3 of 3 2350 3115 53823 53250.44 (a) Calcium Dissolved 227789.51 3 of 3 204000 267000 234484.79 3 of 3 210500 264000 4970149.71 4823320.15 (a) Total 234025.72 3 of 3 193000 290000 243238.76 3 of 3 221000 287500 5106217.86 5003388.16 (a) Copper Dissolved 29.97 2 of 3 BDL 404 59.21 3 of 3 49.7 71.15 653.92 1217.94 564.02 Total 83.51 3 of 3 12.7 1560 217.38 3 of 3 127 325.5 1822.11 4471.48 2649.37 Iron Total 594.59 3 of 3 107 2090 1081.50 3 of 3 576.5 1590 12973.39 22246.31 9272.92 Lead Dissolved
~ ~ BDL BDL 10.94 2 of 3 BDL 12.95
~ 225.03 225.03 Total 6.77 1 of 3 BDL 2.7 23.84 2 of 3 BDL 24.4 147.71 490.39 342.68 Magnesium Dissolved 765931.19 3 of 3 699000 883000 783038.72 3 of 3 712500 904500 16711887.56 16106999.66 (a) Total 781032.79 3 of 3 661000 978000 793166.24 3 of 3 693500 945500 17041390.06 16315321.37 (a) Manganese Dissolved 11.10 3 of 3 3.5 24 9.83 3 of 3 6.6 12.5 242.19 202.20 (a) Total 39.86 3 of 3 25.1 51.3 35.27 3 of 3 23.65 51.75 869.71 725.50 (a) Molybdenum Dissolved 6.83 1 of 3 BDL 8.5 5.97 2 of 3 BDL 7.05 149.02 122.80 (a) Total 8.57 2 of 3 BDL 14 6.72 2 of 3 BDL 15.4 186.99 138.23 (a) Nickel Dissolved 32.40 1 of 3 BDL 500 9.71 1 of 3 BDL 20.1 706.94 199.73 (a) Total 44.43 1 of 3 BDL 1290 13.17 2 of 3 BDL 32 969.42 270.91 (a) Selenium Dissolved
~ ~ BDL BDL 13.83 1 of 3 BDL 42.9
~ 284.48 284.48 Total
~ ~ BDL BDL 13.72 1 of 3 BDL 41.6
~ 282.22 282.22 Sodium Dissolved 6733418.84 3 of 3 5840000 8500000 7096448.89 3 of 3 6190000 8585000 146916772.7 145972985.71 (a)

### Distillation and Reverse Osmosis Brine 18 Total 6756605.00 3 of 3 5540000 8310000 7047726.17 3 of 3 6390000 8110000 147422672.6 144970766.01 (a) Tin Dissolved
~ ~ BDL BDL 7.20 1 of 3 BDL 6.9
~ 148.10 148.1 Total
~ ~ BDL BDL 14.68 3 of 3 8.2 42.1
~ 301.97 301.97 Titanium Total 13.12 2 of 3 BDL 55.8 25.49 3 of 3 8.85 51.15 286.27 524.33 238.06 Zinc Dissolved 14.78 2 of 3 BDL 26.8 70.33 3 of 3 54.15 116.5 322.49 1446.68 1124.19 Total 18.49 2 of 3 BDL 43.9 122.26 3 of 3 92.95 174 403.43 2514.87 2111.44

Classicals (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (lb/yr) (lb/yr) (lbs/yr) Alkalinity 82.44 3 of 3 70 92 91.50 3 of 3 76 105 1798762.12 1882142.52 83380.4 Ammonia as Nitrogen 0.07 1 of 3 BDL 0.11 0.17 2 of 3 BDL 0.33 1527.33 2262.68 735.35 Chemical Oxygen Demand 139.58 2 of 3 BDL 412 244.93 3 of 3 137 429 3045502.39 5038176.69 1992674.3

Chloride 12288.42 3 of 3 10900 15200 13260.50 3 of 3 11500 14800 268121596.3 272766676.27 4645080 HEM 3.83 1 of 3 BDL 9 2.86 1 of 3 BDL 5 83566.94 58829.81 (a) Nitrate/Nitrite 0.02 1 of 3 BDL 0.2 0.02 1 of 3 BDL 0.22 436.38 411.39 (a) Sulfate 1626.17 3 of 3 1360 1860 1629.17 3 of 3 1370 1890 35481477.38 33511804.68 (a) Total Dissolved Solids 20202.53 3 of 3 18200 22100 20659.78 3 of 3 17700 26500 440799923.3 424968856.61 (a) Total Kjeldahl Nitrogen 0.54 3 of 3 0.31 0.75 0.47 2 of 2 0.46 0.49 11782.28 9667.84 (a)

Total Organic Carbon 1.59 2 of 3 BDL 3.5 3.01 3 of 3 2.6 3.5 34692.28 61915.29 27223.01 Total Phosphorous 0.17 3 of 3 0.13 0.25 0.23 3 of 3 0.16 0.27 3709.24 4731.07 1021.83 Total Recoverable Oil & Grease 1.38 2 of 3 BDL 3.4 1.95 3 of 3 0.6 4.2 30110.28 40111.23 10000.95

Total Sulfide 5.77 3 of 3 4 8 5.52 3 of 3 4 7 125895.89 113545.65 (a) Total Suspended Solids 48.34 3 of 3 32 107 85.04 3 of 3 27 386 1054732.66 1749261.20 694528.54

Volatile Residue 620.87 2 of 3 BDL 18200 594.19 2 of 3 BDL 18900 13546790.84 12222407.25 (a)

Organics ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) (lb/yr) (lb/yr) (lbs/yr) 4-Chloro-3- Methylphenol ~ ~ BDL BDL 20.94 2 of 3 BDL 75
~ 430.73 430.73

BDL = Below Detection Limit ~ = Value could not be calculated because samples are BDL (a) = Mass loading estimates were not determined for parameters for which the influent mass loading exceeded the effluent mass loading.

### Distillation and Reverse Osmosis Brine 19 Table 3. Estimated Mass Loadings of Constituents

Constituent Log-normal Mean

Influent ( μ g/L) Log-normal

Mean Effluent ( μ g/L) Influent Mass

Loading (lbs/yr) Effluent Mass

Loading (lbs/yr) Estimated Annual

Mass Loading (Effluent - Influent) (lbs/yr) Ammonia as Nitrogen 0.07 0.17 1527.33 2262.68 735.35

Nitrate/Nitrite 20 20 436.38 411.39 -24.99 Total Kjeldahl Nitrogen 540 470 11782.28 9667.84 -2114.44

Total Phosphorous 0.17 0.23 3709.24 4731.07 1021.83

Copper Dissolved 29.97 59.21 653.92 1217.94 564.02 Total 83.51 217.38 1822.11 4471.48 2649.37 Iron Total 594.59 1081.50 12973.39 22246.31 9272.92 Lead Total 6.77 23.84 147.71 490.39 342.68 Nickel Total 44.43 13.17 969.42 270.91 -698.51 Zinc Total 18.49 122.26 403.43 2514.87 2111.14 Notes: 1. The table lists all constituents whose effluent log-normal mean concentration exceeds the Federal or most stringent state water quality criteria. 2. The average total concentration is the log-normal mean for a constituent, determined from Table 2, by subtracting the influent total average (background) concentration from the effluent total average concentration. 3. Mass loadings are based on average total concentrations and a total fleet brine discharge flow estimate of 2.47 billion gallons per year to navigable waters less than 12 n.m. from shore (1.84 billion gallons per year in port and 0.62 billion gallons per year in transit, from Table 1). Mass loading was not determined for nickel, for which the i nfluent concentration exceeded the effluent concentration.

### Distillation and Reverse Osmosis Brine 20 Table 4. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituent Log-normal

Mean Effluent Minimum

Concentration Effluent Maximum

Concentration Effluent Federal

Acute WQC Most Stringent

State Acute WQC

Classicals ( μ g/L) Ammonia as Nitrogen 170 BDL 330 None 6 (HI) A

Nitrate/Nitrite 20 BDL 220 None 8 (HI) A Total Kjeldahl Nitrogen 470 460 490 None

-
Total Nitrogen B 490 None 200 (HI) A Total Phosphorous 230 160 270 None 25 (HI) A Metals ( μ g/L) Copper Dissolved 59.21 49.7 71.15 2.4 2.4 (CT, MS) Total 217.38 127 325.5 2.9 2.5 (WA) Iron Total 1081.5 576.5 1590 None 300 (FL) Lead Total 23.84 BDL 24.4 217.2 5.6(FL, GA) Nickel Total 13.17 BDL 32 74.6 8.3 (FL, GA) Zinc Total 122.3 93.0 174 95.1 84.6 (WA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Distillation and Reverse Osmosis Brine 21 Table 5. Summary of Thermal Effects of Distilling Plant Brine Discharge 9

CASE Discharge

Temp (°F) Discharge

Flow (gallons per hour) Ambient

Water Temp (°F) Predicted

Plume Length (m) Allowable

Plume Length (m) Predicted

Plume Width (m) Allowable

Plume Width (m) Predicted

Plume Depth (m)
Virginia State (3.0 ° C Δ T) 4a (CV 63) 104 24,083 40 3.8 32,000 0.43 3,200 0.43 4b (CGN 36) 120 6,375 40 2.57 32,000 0.35 3,200 0.35 Washington State (0.3 ° C Δ T) 4a (CV 63) 104 24,083 50 16.42 73 1.83 400 1.83 4b (CGN 36) 120 6,375 50 7.72 73 19.28 400 0.96



### Table 6. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation NSTM a X

2.2 Releases to the Environment NSTM and MSDSs a,b X

2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate Design Documentation X X

3.3 Constituents X X 3.4 Concentrations MSDS b X 4.1 Mass Loadings X 4.2 Environmental Concentrations X X 4.3 Thermal Effects X4.4 Potential for Introducing NonIndigenous Species X

a NSTM - Naval Ships’ Technical Manual b MSDS - Material Safety Data Sheet

### Distillation and Reverse Osmosis Brine MPCD Analysis 1 DISTILLATION AND REVERSE OSMOSIS BRINE MARINE POLLUTION CONTROL DEVICE (MPCD) ANALYSIS

Several alternatives were investigated to determine if any reasonable and practicable MPCDs exist or could be developed for controlling distillation and reverse osmosis (RO) brine discharges. An MPCD is defined as any equipment or management practice, for installation or use onboard a vessel, designed to receive, retain, treat, control, or eliminate a discharge incidental to the normal operation of a vessel. Phase I of UNDS requires several factors to be considered when determining which discharges should be controlled by MPCDs. These include the practicability, operational impact, and cost of an MPCD. During Phase I of UNDS, an MPCD option was deemed reasonable and practicable even if the analysis showed it was reasonable and practicable only for a limited number of vessels or vessel classes, or only on new construction vessels. Therefore, every possible MPCD alternative was not evaluated. A more detailed evaluation of MPCD alternatives will be conducted during Phase II of UNDS when determining the performance requirements for MPCDs. This Phase II analysis will not be limited to the MPCDs described below and may consider additional MPCD options.
MPCD Options

D istilling and RO plants generate freshwater from seawater for a variety of shipboard applications, including potable water for drinking, hotel services, aircraft and vehicle washdowns, boiler feedwater on steam-powered vessels, and auxiliary boiler feedwater on most vessels. Discharges from distilling and RO plants contain influent seawater, contaminants from system components, and anti-scaling treatment chemicals. Distilling plants boil seawater, and the resulting steam is condensed into distilled water. During the distilling process, seawater constituents form a scale on the heat transfer surfaces. Therefore, anti-scaling compounds are continuously injected into the influent seawater to control the scaling. The remaining seawater concentrate or “brine” that does not boil away is discharged overboard. RO systems separate freshwater from seawater using semi-permeable membranes as a physical barrier, allowing a portion of the influent seawater to pass through the membrane as freshwater, while capturing suspended and dissolved constituents. These captured substances become concentrated in a seawater brine that is subsequently discharged overboard.
Five potential MPCD options were investigated for controlling this discharge within 12 n.m. of shore. The MPCD options were selected based on screenings of alternate materials and equipment, pollution prevention options, and management practices. They are listed below with brief descriptions of each:
Option 1: Restrict operation of water purification plants in port - Eliminate or minimize distilling and RO plant use in port. This would require alternate sources of distilled/demineralized water for boiler feedwater for steam powered vessels.

### Distillation and Reverse Osmosis Brine MPCD Analysis 2 Option 2: Layup non-essential water purification plants with freshwater when in port - Require the use of shore-supplied freshwater to layup all water purification plants on non-steam powered vessels and the non-essential plants onboard steam powered vessels, to reduce corrosion.
Option 3: Require RO systems on new ships - Specify RO plants instead of distilling plants to meet freshwater requirements (except boiler feedwater production) for new construction ships. RO plant discharges are expected to contain fewer heavy metals.
Option 4: Substitute freshwater for seawater to operate distilling plants onboard steam-powered vessels while in port - Require freshwater from a shore connection, instead of seawater, to provide feedwater for distilling plants on steam-powered vessels. This option would reduce metal mass loadings in the brine discharge by reducing seawater induced corrosion.
Option 5: Change distilling and RO plant construction materials - Specify water purification plants that are constructed of materials that minimize or eliminate discharge of harmful constituents.
MPCD Analysis Results
Table 1 shows the results of the MPCD analysis. It contains information on the elements of practicability, effect on operational and warfighting capabilities, cost, environmental effectiveness, and a final determination for each option. Based on these findings, Option 3 -- requiring RO systems on new construction ships – offers the best combination of these elements and is considered to represent a reasonable and practicable MPCD.

### Distillation and Reverse Osmosis Brine MPCD Analysis 3 Table 1. MPCD Option Analysis and Determination

MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

Option 1. Restrict operation of water purification plants in port This option primarily affects steam-powered surface ships, which run their distillers in port to produce feedwater for their propulsion boilers. Distilled water would alternatively have to be provided by shore facilities and it is unlikely that the shore facilities could meet the full feedwater requirements of the ships in a port. The impact of this option on operational capabilities depends on the amount of distilled water that can be obtained from shore for boiler feedwater. Inadequate feedwater supply will adversely affect theability to get a steampowered ship underway, and whether or not sufficient reserves are available to quickly go to full power and to sustain that power for as long as needed. This option would impose additional costs to meet distilled water requirements from an alternate, shoreside

source. 1 

### Costs include shore infrastructure and possible additional shoreside manning. Similar costs would be incurred if shore-supplied steam were used in place of steam from in-port boiler operation. This option would reduce shipboard water purification plant operating and maintenance costs. This option would be effective in reducing in-port distilling plant brine discharge constituents and any accompanying thermal effects. The effectiveness of this option is proportional to how much the distilling plant operation could be restricted, which would depend on the availability of alternate sources of boiler feedwater and/or steam. Although this option would reduce the discharge, there is currently no alternate source of boiler feedwater, the option has the possibility to cause an adverse effect on operational capabilities, and this option would impose additional costs to provide an alternate source of boiler feedwater for the operation of propulsion boilers. However, on vessels that are not steam powered, this option warrants further consideration.Option 2. Layup nonessential water purification plants with fresh-water when in port Steam powered vessels normally operate just one plant in port to produce the required high purity feedwater for boilers. Therefore, this optionaddresses all plants on nonsteam powered vessels and the non-essential plants onboard steam powered vessels. Freshwater is predicted to be less corrosive than seawater, leading to improved maintenance and reliability. NSTM procedure already allows for freshwater Freshwater layup of nonessential water purification plants in port is a minor change in management practice, which will not affect the operational availability of the vessel. The additional cost for the freshwater layup procedure would include shore supplied freshwater for the layup, at approximately $1.00/1000 gallons, 1 

### and engineering and installation costs for pipings and fittings to provide a pierside freshwater supply. The beneficial effects of reduced corrosion may decrease maintenance costs. This option would reduce the magnitude of metal mass loadings, however, purification plants still operated in port, may continue to exceed water quality standards. Implementing a freshwater layup of water purification plants on is: 1) feasible, 2) would not affect ship capabilities, 3) should not impose significant costs, and 4) could reduce metal mass loading. Despite this reduction, metal concentrations could continue to exceed water quality standards.

### Distillation and Reverse Osmosis Brine MPCD Analysis 4 MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

layups. A freshwater source and the means to feed it to the plant are required for this option. Option 3. Require RO systems on new ships Steam-powered-vessel propulsion boilers require quantities of high purity feedwater not currently achievable by shipboard RO systems, so these vessels would require a combination of RO and distilling plants. RO units are smaller, requiring less space and equipment interface than distilling plants. RO membranes are damaged by oil and other contaminants prevalent in littoral waters. 2

, 3 

### This option would reduce acoustic and thermal signatures since RO plants have fewer motors and pumps, and do not require or produce heat. Overall, RO systems cost significantly less than distilling plants with respect to life cycle costs, including acquisition, engineering and installation, logistics support, operation, and maintenance. RO units do not require chemical feed and cleaning agents, so chemical and cleaning costs would not incur. This option would reduce the brine discharge volume and is predicted to reduce the concentrations of constituents in the discharge. Compared to distillers, RO plants contain fewer heavy metal sources, do not use heat in the waterpurification processeliminating thermal effects, and do not use anti-scaling chemical additives. Requiring the installation of RO plants on all new ships would: 1) be feasible if installed along withdistilling plants on steampowered vessels, 2) have minimal operational impacts, 3) cost significantly less than distilling plants, and 4) reduce brine discharge constituent concentrations.

Option 4. Substitute freshwater for seawater to operate distillingplants onboard steampowered vessels while in port Influent water for the distillers would require a pierside freshwater supply, however, shore facilities may not be equipped to provide a sufficient volume of freshwater. Considerable shore infrastructure upgrades would be required to implement this option. Since this option is confined to in-port operation of distilling plants, it will not impact operational and warfighting capabilities. This option would impose cost increases due to: 1) shore supplied freshwater at $1.00/1000 gallons 1 

### and 2) engineering and installation costs for shore infrastructure upgrades. The beneficial effects of reduced corrosion could reduce maintenance costs, therefore compensating for and increase from cleaning and de-scaling. This option would reduce, but not eliminate the discharge of heavy metals, such as copper and nickel, originating from distilling plant components. Implementing the use of freshwater for water purification plant operation on steam powered vessels in port is: 1) feasible with shore infrastructure upgrades, 2) would not affect ship capabilities, and 3) would reduce metal mass loading. Despite this reduction, metal concentrations could continue to exceed water quality standards. Option 5. Change distilling and RO plant construction materials This option would primarily apply to distilling plants because RO plants do not employ heating coils which introduce metals into the This option would not impact ship operations, provided that system reliability is maintainted. Thermal signature is not This option would impose research, development, and material costs. The alternative materials (i.e. stainless steel, titanium, or Alternate materials would reduce the concentration and volume of brine discharge constituents. The level of constituent Changing plant piping and fitting materials will reduce heavy metal and scaling treatment constituent concentrations and loadings

### Distillation and Reverse Osmosis Brine MPCD Analysis 5 MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

discharge stream. In order for this option to be practicable, the new materials could not increase the maintenance requirements, size, or weight of the water purification plant. If materials are simply substituted, space requirements would remain the same and weight would be expected to decrease, making this a practicable option. expected to change. nickel alloys) would range in cost from $0.10/lb to $100/lb. 4

, 5

, 6 

### Shore infrastructure and manning costs would increase if material changes required special maintenance and repair capabilities. reduction would be proportional to the extent to which materials contributing to heavy metals in the discharge are replaced or removed from the system. from brine discharge. Using alternate materials for the actual water purification equipment is less practicable, may entail higher life cycle cost, and Navy grade water purification plants made of alternate materials are not readily available.

### Distillation and Reverse Osmosis Brine MPCD Analysis 6 REFERENCES

1 

### Memorandum from Mr. R. Bernstein (M. Rosenblatt & Son, Inc.), Subj: Estimate for Freshwater Supply to Vessels While Inport, November 13, 1997.

2 

### Naval Ship’s Technical Manual, Chapter 531 - Desalination, Volume 1 - Low-Pressure Distilling Plants, S9086-SC-STM-010/CH-531V1, First Revision, March 21, 1996.

3 

### Naval Ship’s Technical Manual, Chapter 533 - Potable Water Systems, S9086-SC-STM010/CH-533, Third Revision, March 15, 1995.

4 

### Titanium Prices, e-mail from Mr. Sam Fisher, Principal Metals, Inc., November 13, 1997.

5 

### Titanium Prices, personal communication with Mr. Bob Marsh, Titanium Industries, Inc., November 24, 1997.

6 

### Metals Prices, MetalWorld, Inc., http://www.metalworld.com, August 29, 1997.

### Elevator Pit Effluent 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for

“ ...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces,

... ” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)

— either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Elevator Pit Effluent

### Elevator Pit Effluent 2 2.0 DISCHARGE DESCRIPTION
This section describes the discharge from elevator pits and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Most large surface vessels have at least one type of elevator; however, elevator configurations vary between ship classes. On each ship, several different types and sizes of elevators may be used to transport small packages, large cargo items, ordnance, food supplies, and personnel. 1 

### Elevators can service several decks depending on their purpose. Elevator doors open at each deck for loading and unloading. The elevator operates using either cables, rails, or hydraulic pistons. The elevators that raise and lower aircraft on aircraft carriers cannot produce this discharge because they are open to the sea and do not have elevator pits. Elevators that operate in shafts have a sump in the pit to collect liquids that may enter the elevator and shaft

area. 1 

### If the elevator pit is located above the waterline, the sump is fitted with a drain that directs the waste overboard. This drain is normally higher than the sump floor to prevent clogging from solids. If the elevator pit is located below the waterline, the pit is educted dry using the firemain water supply.

2.2 Releases to the Environment
For elevators with pits, deck runoff and elevator equipment maintenance activities are the major sources of liquid that accumulate in the pit. Deck runoff occurs during heavy rains, rough seas, and deck washdowns. During these events, water from the deck can enter the elevators and elevator shafts when the elevator doors are open, or through worn seals when the doors are closed (non-watertight). When water enters the elevator pit, it can contain materials that were on the deck, including aviation fuel, hydraulic fluid, lubricating oil, residual water, and aqueous film forming foam (AFFF). 2 

### The runoff may also include lubricant applied to the elevator doors, door tracks, and other moving elevator parts. Residue in the elevator car from the transport of materials may also be washed into the elevator pit. The cleaning solvent used during maintenance cleaning operations as well as liquid wastes generated by the cleaning process drain into the elevator pit sump. This mixture of materials and liquid collects in the sump at the bottom of the elevator pit.

Waste accumulated in t he elevator pits is removed by gravity draining, by educting overboard using firemain powered eductors, by using a vacuum or sponges to transfer the waste to the ship ’

s bilge system for treatment as bilgewater, or by containerizing it for shore disposal. 3 

### Since elevator pit eductors use the firemain water supply, the elevator pit effluent can contain any constituents present in the firemain water. The ratio of elevator pit waste to firemain supply can vary from 1:1 to 3:1, depending on the type of eductor used to evacuate the elevator pit.

2.3 Vessels Producing the Discharge

### Elevator Pit Effluent 3 All of the ships listed in Tables 1, 2, and 3 have the potential to produce an elevator pit discharge. Table 1 lists the MSC ships that have elevators. Tables 2 and 3 list the number and types of major elevator systems on Navy surface combatants and support ships, respectively. 4 

### U.S. Coast Guard (USCG), Air Force, and Army vessels do not produce this discharge because they do not have elevator pits.

3.0 DISCHARGE CHARACTERISTIC S
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
This discharge has the potential to occur within and beyond 12 nautical miles (n.m.) from shore. Inspections of elevator pits on Navy ships in port revealed that elevator pits are generally dry and that elevator pit effluent is not expected to be discharged in significant amounts within 12 n.m. because of current practices which educt the waste overboard prior to the ship coming within 12 n.m. of shore. 3 

### Without these practices, this effluent could be discharged while pierside or underway.

3.2 Rate
The rate of this discharge is subject to frequency and amount of deck runoff (e.g., washdown water and rainfall), as well as the frequency of use of the elevators and the size of the elevator opening. These factors vary greatly between vessel classes. Inspections were performed on nine vessels to investigate the presence of accumulated waste in elevator pits. The inspections revealed that elevator pits in each vessel were often dry when the vessel came into port, because the accumulated waste had either been drained or educted overboard prior to the vessel coming within 50 n.m. of land, containerized for shore disposal, or the waste had been transferred to the bilge for treatment by the oil water separator (OWS) as bilgewater. 3 

### Based on this information, it is estimated that the discharge flow rates of elevator pit effluent within the 12 n.m. zone are minimal.

3.3 Constituents
The constituents of elevator pit effluent are affected by the amount and type of materials on deck, the agents used during cleaning and maintenance of the elevators, and to some degree the material transported in the elevators. At any given time elevator pit effluent may contain the following constituents:

• grease;

• lubricating oil;

### Elevator Pit Effluent 4 • solvent;

• soot;

• dirt;

• paint chips;
Additional constituents that may be carried into the elevator pit by deck runoff can include fuel, AFFF, glycol, and sodium metasilicate. Material safety data sheet (MSDS) information on these materials indicate that the constituents can include polymers, heavy hydrocarbons, paraffinic distillates, silicone compounds, various organic acids, hydroxyl compounds, naphtha compounds, various oils, and some metals such as lead and zinc.
When eductors are used to remove the waste accumulated in elevator pits, the effluent is a combination of the pit waste and the firemain water that is used for eduction. It is not possible to determine the percentages of each of these sources, because they would vary from ship to ship depending upon a number of factors. Furthermore, effluent sampling would not help to determine these percentages, as it would be impossible to isolate and analyze the three sources of the discharge. The Firemain Systems NOD report contains a more complete discussion of those constituents found in firemain water. The only constituents present in the firemain water that were found to exceed water quality criteria were copper, iron, and nickel.
Of the constituents listed above, the expected priority pollutants in this discharge are bis(2-ethylhexyl) phthalate, silver, chromium, copper, iron, nickel, lead, zinc, and phenols. Deck runoff is the source of these pollutants, with the exception of bis(2-ethylhexyl) phthalate, copper, iron, and nickel, which are also present in firemain water. Additional information concerning these pollutants can be found in the Deck Runoff NOD report.
No bioaccumulators are anticipated in this discharge.

3.4 Concentrations
Constituent concentrations of deck runoff resulting from precipitation will vary with a number of factors. The following factors affecting deck runoff constituent concentrations are dependent on time since the last rainfall or deck washdown:

• intensity and duration of rainfall;

• type, intensity, and duration of weather (high sea state and green water);

• season (which will affect glycol loading from deicing fluids);

• ship ’ s adherence to good housekeeping practices; and

• ship ’ s operations.
The periodicity of cleaning and lubrication of the mechanical components in the elevator pit will also affect constituent concentrations. For example, if the guide rollers, bearings, etc., located in the bottom of the elevator shaft are cleaned and greased more often, the concentrations of solvent and grease in the effluent could increase.

### Elevator Pit Effluent 5 The Firemain Systems NOD report contains a more detailed analysis of firemain water constituent concentrations. As shown in Table 4, the firemain water constituents that exceeded the most stringent water quality criteria were total nitrogen, bis(2-ethylhexyl) phthalate, copper, iron, and nickel, where the total measured effluent log-normal mean concentrations were 500 micrograms per liter (μg/L), 22 μ g/L, 62.4 μ g/L, 370 μg/L, and 15.2 μg/L, respectively. 5



### 4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. A discussion of mass loadings is presented in Section 4.1. In Section 4.2, the concentrations of discharge are discussed, and in Section 4.3, the potential for the transfer of non-indigenous species is evaluated.

4.1 Mass Loading
Mass loadings cannot be calculated because the quantity of constituents released from elevator pits cannot be estimated, and because the concentration of these constituents will vary as discussed in Section 3.4. Inspections of elevator pits on Navy ships in port revealed that elevator pits are generally dry and that elevator pit effluent is not expected to be discharged in significant amounts within 12 n.m. because of current practices which educt the waste overboard prior to the ship coming within 12 n.m. of shore. 3



### 4.2 Environmen tal Concentrations
Concentrations of grease, oil, cleaning solvent, and other pollutants that might be present in elevator pit effluent have not been estimated. The concentrations of total nitrogen, bis(2- ethylhexyl) phthalate, copper, iron, and nickel in the firemain water used for eduction have been found to exceed water quality criteria.

4.3 Potential for Introducing Non-Indigenous Species
The major sources of elevator pit effluent, deck runoff and maintenance activities, do not have a significant potential to introduce non-indigenous species; therefore, this discharge does not have a significant potential for transporting non-indigenous species.

5.0 CONCLUSION
Uncontrolled, elevator pit effluent could possibly have the potential to cause an adverse environmental effect because oil could be discharged in amounts and concentrations high enough to cause an oil sheen, especially when the vessel is pierside. There are currently no formalized management practices in place regulating this discharge. However, surveys and inspections of nine Navy ships indicated that the current practice is to containerize the waste for shore disposal,

### Elevator Pit Effluent 6 to transfer the waste to the ship ’ s bilges for processing by the OWS, or to refrain from discharging the waste overboard. 3



### 6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained, reviewed, and analyzed. Table 5 indicates the data source of the information presented in each section of this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes - Elevator Pit Effluents. October 1, 1996.

2. Round 2 Equipment Expert Meeting Minutes - Elevator Pit Effluent. April 3, 1997.

3. Navy Fleet Technical Support Center Pacific (FTSCPAC) Inspection Report Regarding Elevator Pit and Anchor Chain Locker Inspection Findings on Six Navy Ships, March 3, 1997.

4. Naval Surface Warfare Center, Carderock Division, Philadelphia Site (NSWCCD-SSES) Report Regarding Number and Type of Elevators on Various Navy Vessels, Paul Hermann, October 17, 1997.

5. UNDS Phase I Sampling Data Report, Volumes 1-13, October 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States ’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.

### Elevator Pit Effluent 7 Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Elevator Pit Effluent 8 Table 1. Type of Elevators and Conveyors on MSC Ships

Vessel Passenger

Elevators Cargo Elevator Stores Lift (British) Mars AFS 1 (1) 16,000 lb CARGO (2) 4,000 lb (HYD) HELO Niagara Falls AFS 3 (1) 16,000 lb CARGO (2) 10,000 lb HELO (2) 12,000 lb CARGO Concord AFS 5 (1) 16,000 lb CARGO (2) 10,000 lb HELO (2) 12,000 lb CARGO San Diego AFS 6 (1) 16,000 lb CARGO (2) 10,000 HELO

San Jose AFS 7 (1) 16,000 lb CARGO (2) 10,000 lb HELO (2) 12,000 CARGO (3) 4,000 lb CARGO T-AFS 8 Class 3 Vessels 8 per vessel 1 per vessel

T-AH 19 Class 2 Vessels 10 per vessel

T-AO 187 Class 10 Vessels 1 per vessel

LKA-113 Class 2 Vessels 6 per vessel

T-AE 28 Class 4 Vessels 6 per vessel

T-AE 32 Class 4 Vessels 6 per vessel 1



### 1. Number 6 elevator divides into two elevators.

### Elevator Pit Effluent 9 Table 2. Number and Type of Major Elevator Systems

(Navy Surface Combatants)
Ship Class Number of

Vessels Number of Elevators

Per Vessel Type of

Elevator CG 47 27 2 Ammunition DD 963/ DDG 993 35 2 Ammunition

FFG 7 48 1 Pallet CVN 65 1 14 Weapons CVN 68 7 9 (CVN 72 - 74) 10 (CVN 68, 70, 71) 11 (CVN 69) Weapons

CV 67 1 9 Weapons CV 63 2 11 (CV 63) 12 (CV 64) Weapons

### Elevator Pit Effluent 10 Table 3. Number and Type of Major Elevator Systems (Navy Auxiliary and Amphibious ships)

Ship Class Hull Number of Type of Elevators Elevator Underway AE 27 6 Cargo/Weapons Replenishment AE 28 6 Cargo/Weapons Ships AE 29 6 Cargo/Weapons AE 32 7 Cargo/Weapons AE 33 7 Cargo/Weapons AE 34 7 Cargo/Weapons AE 35 7 Cargo/Weapons AOE 1 9 Cargo/Weapons AOE 2 9 Cargo/Weapons AOE 3 9 Cargo/Weapons AOE 4 9 Cargo/Weapons AOE 6 6 Cargo/Weapons

1 Cargo AOE 7 6 Cargo/Weapons

1 Cargo AOE 8 7 Cargo/Weapons AO 177 1 Weapons AO 178 1 Weapons AO 179 1 Weapons AO 180 1 Weapons AO 186 1 Weapons Material AS 36 8 Cargo Support 2 Component Ships 2 Weapons AS 39 8 Cargo

2 Component 1 Weapons AS 41 8 Cargo

2 Component 1 Weapons Amphibious LCC 19 1 Vehicle Warfare LCC 20 1 Vehicle Ships LHA 1 5 Cargo/Weapons 1 Medevac LHA 2 5 Cargo/Weapons

1 Medevac LHA 3 5 Cargo/Weapons

1 Medevac LHA 4 5 Cargo/Weapons

1 Medevac LHA 5 5 Cargo/Weapons

1 Medevac LHD 1 6 Cargo/Weapons

1 Medevac LHD 2 6 Cargo/Weapons

1 Medevac

### Elevator Pit Effluent 11 Ship Class Hull Number of Type of Elevators Elevator Amphibious LHD 3 6 Cargo/Weapons Warfare 1 Medevac Ships (continued) LHD 4 6 Cargo/Weapons 1 Medevac LHD 5 6 Cargo/Weapons

1 Medevac LPD 1 Decommissioned LPD 2 Decommissioned LPD 4 1 Cargo/Weapons LPD 5 1 Cargo/Weapons LPD 6 1 Cargo/Weapons LPD 7 1 Cargo/Weapons LPD 8 1 Cargo/Weapons LPD 9 1 Cargo/Weapons LPD 10 1 Cargo/Weapons MCS 12 1 Cargo/Weapons LPD 13 1 Cargo/Weapons LPD 14 1 Cargo/Weapons LPD 15 1 Cargo/Weapons LPH 3 2 Weapons LPH 11 2 Weapons LPH 12 2 Weapons LSD 41 1 Cargo

1 Weapons LSD 42 1 Cargo

1 Weapons LSD 43 1 Cargo

1 Weapons LSD 44 1 Cargo

1 Weapons LSD 45 1 Cargo

1 Weapons LSD 46 1 Cargo

1 Weapons LSD 47 1 Cargo

1 Weapons LSD 48 1 Cargo

1 Weapons LSD 49 2 Cargo

1 Ammunition 3 Lift Platform LSD 50 2 Cargo

1 Ammunition 3 Lift Platform LSD 51 2 Cargo

1 Ammunition 3 Lift Platform Other Auxiliary AGF 3 1 Cargo/Weapons/Stores Ships AGF 11 1 Cargo/Weapons

### Elevator Pit Effluent 12 Table 4. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituents Log-normal

Mean Effluent Minimum

Concentration Effluent Maximum

Concentration Effluent Federal Acute

WQC Most Stringent

State Acute WQC

Classicals ( μ g/L) Total Nitrogen 500 None 200 (HI) A Organics ( μ g/L) Bis(2-ethylhexyl) phthalate 22 BDL 428 None 5.92 (GA)

Metals ( μ g/L) Copper Dissolved 24.9 BDL 150 2.4 2.4 (CT, MS) Total 62.4 34.2 143 2.9 2.5 (WA) Iron Total 370 95.4 911 None 300 (FL) Nickel Total 15.2 BDL 52.1 74.6 8.3 (FL, GA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values.

CT = Connecticut FL = Florida GA = Georgia MS = Mississippi WA = Washington



### Table 5. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X X 3.2 Rate X 3.3 Constituents MSDS X 3.4 Concentrations unknown 4.1 Mass Loadings unknown 4.2 Environmental Concentrations unknown4.3 Potential for Introducing NonIndigenous Species X

### Firemain Systems 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Firemain Systems

### Firemain Systems 2 2.0 DISCHARGE DESCRIPTION
This section describes the firemain discharges and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Firemain systems distribute seawater for fire fighting and secondary services. The firefighting services are fire hose stations, seawater sprinkling systems, and foam proportioning stations. Fire hose stations are distributed throughout the ship. Seawater sprinkling systems are provided for spaces such as ammunition magazines, missile magazines, aviation tire storerooms, lubricating oil storerooms, dry cargo storerooms, living spaces, solid waste processing rooms, and incinerator rooms. Foam proportioning stations are located in rough proximity to the areas they protect, but are separated from each other for survivability reasons. Foam proportioners inject fire fighting foam into the seawater, and the solution is then distributed to areas where there is a risk of flammable liquid spills or fire. Foam discharge is covered in the aqueous film forming foam (AFFF) NOD report. The secondary services provided by wet firemain systems are washdown countermeasures, cooling water for auxiliary machinery, eductors, ship stabilization and ballast tank filling, and flushing for urinals, commodes and pulpers. The washdown countermeasure system includes an extensive network of pipes and nozzles, to produce a running water film on exterior ship surfaces. Not all these services are provided on all vessels.
Firemain systems fall under two major categories: wet and dry firemains. Wet firemains are continuously pressurized so that the system will provide water immediately upon demand. Dry firemains are not charged with water and, as a result, do not supply water upon demand. Most vessels in the Navy's surface fleet operate wet firemains. 1 

### Most vessels in the Military Sealift Command (MSC) use dry firemains. 1 

### All U.S. Coast Guard (USCG), and U.S. Army vessels use dry firemains.
For the purposes of the Firemain Systems NOD report, the firemain system includes all components between the fire pump suction sea chest and the cutout valves to the various services. If the discharge from the service is not covered by its own NOD report, it is included in this Firemain Systems NOD report. The components of the firemain system are the sea chests, fire pumps, valves, piping, fire hose, and heat exchangers.
Seawater from the firemain is discharged over the side from fire hoses, or directly to the sea through submerged pipe outlets. Seawater discharges from secondary services supplied from the firemain are described in the pertinent NOD reports; see Section 2.2 below.
The sea chest is a chamber inset into the hull, from which seawater flows to a fire pump. The fire pump sea chests are constructed of the hull material - steel - and are coated with durable epoxy paints. They also contain steel waster pieces or zinc sacrificial anodes for corrosion protection. The fire pumps are constructed of titanium, stainless steel, copper alloyed with tin or

### Firemain Systems 3nickel, or non-metallic composites. The pipes in wet firemain systems are primarily coppernickel alloys and fittings are bronze that are connected by welding or by silver-brazed joints. Dry firemain systems can be constructed of these same materials but are normally constructed of steel.
Fire pumps are centrifugal style pumps driven by steam tur bines, electric motors, and/or diesel engines. The pumps are located in the lower levels of vessels and are sized to deliver required flow and pressure to equipment or systems on the upper decks. Pump sizes range from 50 to 250 gallons per minute (gpm) on small vessels to 2,000 gpm on large vessels. 1 

### To prevent overheating when firemain load demands are low, Navy fire pumps are designed to pass 3 to 5% of the nominal flow rate back to the sea suction or overboard. 2 

### This also provides flow to the pump’s seals.
The firemain piping layout (architecture) is governed by the mission or combatant status of the ship. The simplest architecture consists of a single main run fore and aft in the ship, with single branches to the various services supplied from the firemain. More complex architectures incorporate multiple, widely separated mains with cross connects, and feature multiple pipe paths to vital services. Regardless of the architecture, all firemain systems include pipe sections which may contain stagnant water. For example, except during fire fighting, the valves at the fire plugs are closed and sprinkling systems do not flow.
Navy firemain system capacity is designed to meet peak demand during emergency conditions, after sustaining damage. This capacity is determined by adding the largest fire fighting demand, the vital continuous flow demands, and a percentage of the intermittent cooling demands. The number of fire pumps required to meet this capacity is increased by a 33% margin to account for battle damage or equipment failure. 2 

### As a result, Navy firemain systems have excess capacity during routine operations.
Firemain capacity on most MSC, U.S. Coast Guard (USCG), and Army ships is designed to commercial standards as prescribed by regulations pertinent to each ship type. 3,4 

### Ships acquired from naval or other sources satisfy other design criteria, but the firemain capacity requirements meet or exceed commercial standards. A minimum of two pumps is required. The required firemain capacity is less than would be required on Navy ships of similar type and size.
Dry firemains are not charged and do not provide instantaneous water pressure. These systems are periodically tested as part of the planned maintenance system (PMS) and are pressurized during training exercises.

2.2 Releases to the Environment
Seawater discharged overboard from the firemain contains entrained or dissolved materials, principally metals, from the components of the firemain system. Some traces of oil or other lubricants may enter the seawater from valves or pumps.

### Firemain Systems 4 Fire fighting, space dewatering using eductors, counterflooding, and countermeasure washdown constitute emergency discharges from the firemain, and are not incidental to the vessel’s operation. Some auxiliary machinery is provided with backup emergency cooling from the firemain. Use of the firemain for backup emergency cooling is not an incidental discharge. Seawater from the firemain is released to the environment as an incidental discharge for the following services:

• Test and maintenance;

• Training;

• Cooling water for auxiliary machinery and equipment, for which the firemain is the normal cooling supply. Examples are central refrigeration plants, steering gear coolers, and the Close In Weapon System;

• Bypass flow overboard from the pump outlet, to prevent overheating of fire pumps when system demands are low; and

• Anchor chain washdown.
The following are incidental services provided from the firemain, but the release to the environment is discussed separately as shown:

• Ballast tank filling (Clean Ballast NOD report);

• Flushing water for commodes (Black Water[sewage]; not part of the UNDS study);

• Flushing water for food garbage grinders (Graywater NOD report);

• Stern tube seals lubrication (Stern Tube Seals & Underwater Bearing Lubrication NOD report); and

• AFFF (AFFF NOD report).

2.3 Vessels Producing the Discharge
All Navy surface ships use wet firemain systems with the exception of two classes of oceanographic research ships. Submarines use dry systems. Boats and craft are not equipped with firemain systems and generally use portable fire pumps or fire extinguishers for fire fighting. Most ships operated by the MSC use dry firemain systems, so they do not continuously discharge water overboard as part of normal operations; however, two classes of ships use wet firemains. These classes are ammunition ships (T-AE) and combat stores ships (T-AFS). The USCG and Army use dry firemain systems, so they do not continuously discharge water overboard as part of normal operations. Table 1 lists the ships and submarines in the Navy, MSC, USCG, and Army, and notes whether their firemain systems are the wet or dry type.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

### Firemain Systems 5 3.1 Locality
Firemain discharge occurs both within and beyond 12 nautical miles (n.m.) of shore.

3.2 Rate
The flow rates for wet firemain discharge depend on the type, number, and operating time of equipment and systems that use water from the firemain. Operating times of many systems are highly variable. Some connected services, such as refrigeration plants, are operated continuously; others, such as hydraulics cooling or aircraft carrier jet blast deflectors, are operated only during specific ship evolutions. Ships with auxiliary seawater cooling systems tend to have relatively few services that draw continuous flow from the firemain. For these ships, the firemain discharge will be small compared to the discharge from the seawater cooling system. Table 2 shows the theoretical upper bound estimate of discharge from wet firemain systems, with an estimated total annual volume of approximately 18.6 billion gallons. The estimate is considered an upper bound because, for most ships, all flow from the fire pumps is assumed to be an environmental release attributable to the firemain system.
Sample calculation for Table 2:

(Qty of ships)(Flow rate (gpm))(1440 min/day)(Days within 12 n.m./yr) = gal/yr

The discharge from dry firemains is approximately 0.1% of the discharge from wet firemains because none of the discharge is continuous. A theoretical upper bound estimate for discharges from dry systems within 12 n.m. is given in Table 3.

Sa mple calculation for Table 3:

(Qty of ships)(Flow rate (gpm))(10 minutes/wk)(Days within 12 n.m./yr)(1 wk/7 days) = gal/yr

The 10 minutes/week is based on a minimum of 2 pumps required by USCG regulations, in addition to a run time of 5 minutes/week per pump based upon equipment expert knowledge. 5,6,7



### 3.3 Constituents

The water for firemain services is drawn from the sea and returned to the sea. Metals and other materials from the firemain and its components can be dissolved by the seawater. Table 4 lists such metals and other materials. Where seawater flow is turbulent, particles of metal will be eroded from pump impellers, valve bodies, and pipe sections, and carried in the firemain as entrained particles. 8 

### Electrochemical corrosion attacks at the junctions of dissimilar metals to produce both dissolved and particulate metals. Any wetted material in the system can contribute dissolved or particulate constituents to the firemain discharge. These constituents can include copper, nickel, aluminum, tin, silver, iron, titanium, chromium, and zinc. Based on knowledge

### Firemain Systems 6 of the system, the principal expected constituents that are priority pollutants would be copper, nickel, and zinc. Copper and nickel are found in the piping of wet firemain systems, and sacrificial zinc anodes are placed in some sea chests and heat exchangers. None of these expected constituents are bioaccumulators.
Most dry type firemain systems are constructed of steel pipe, without zinc anodes. Therefore, copper, nickel and zinc are not expected constituents of dry type firemain systems.

3.4 Concentrations
The firemain systems of three ships were sampled for 26 metals (total and dissolved), semi-volatile organic compounds, polychlorinated biphenyls (PCBs), and classical constituents. Only wet firemains were sampled because the volumes discharged by wet firemains comprise the vast majority of the total volume of the discharge. The firemains were sampled both at the inlet and at the discharge to determine what constituents were contributed by the firemain system. The three ships sampled were a dock landing ship, an aircraft carrier, and an amphibious assault ship. Details of the sampling effort and the sampled data are described in the Sampling Episodes Report for seawater cooling. Table 4 summarizes the results.
Variability is expected within this discharge as a result of several factors including material erosion and corrosion, residence times, passive films, and influent water variability. Pipe erosion is caused by high fluid velocity, or by abrasive particles entrained in the seawater flowing at any velocity. In most cases of pipe erosion, the problematic high fluid velocity is a local phenomenon, such as would be caused by eddy turbulence at joints, bends, reducers, attached mollusks, or tortuous flow paths in valves. Passive films inhibit metal loss due to erosion. Corrosion is influenced by the residence time of seawater in the system, temperature, biofouling, constituents in the influent, and the presence or absence of certain films on the pipe surface. All of these influences on metallic concentrations are variable within a given ship over time, and between ships.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria.Section 4.3 discusses thermal effects. In Section 4.4, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Mass loadings are shown in Table 5. The concentrations of constituents contributed by the firemain system were combined with the estimated annual firemain discharge from Table 2 for wet firemains to determine mass loadings by the equation:

### Firemain Systems 7 Mass Loading (lbs/yr) = (Table 4 net log normal mean concentration ( μ g/L)) (Table 2 discharge volume (18.6 billion gal/yr))(3.785 L/gal)(2.205 lbs/kg)(10 -9 

### kg/ μ g)

Dry firemains were not sampled. Most dry firemain systems are constructed of steel, so the principal expected metallic constituent will be iron. The discharge rate from dry firemain systems is about 0.1% of the rate from wet firemain systems, so the mass loadings should also be much less. Accordingly, the mass loadings from dry firemain systems were not included in the mass loading estimates.

4.2 Environmental Co ncentrations
Table 6 compares measured constituent concentrations with Federal and the most stringent state chronic water quality criteria (WQC). The comparison in Table 6 shows that the effluent concentrations of bis(2-ethylhexyl) phthalate, nitrogen (as nitrate/nitrite and total nitrogen), copper, iron, and nickel exceed WQC. The copper and nickel contributions each exceed both the Federal and most stringent state criteria. The ambient copper concentration in most ports exceeds the chronic WQC. As mentioned previously, copper and nickel constitute the major construction materials for wet firemains in the Navy. Bis(2-ethylhexyl) phthalate, nitrogen, and iron concentration exceeds the most stringent state chronic criterion.

4.3 Thermal Effects
As mentioned previously, portions of the firemain are used for seawater cooling purposes and will discharge excess thermal energy to receiving waters. The thermal plume from firemains was not modeled directly; however, firemain discharge can be compared to a discharge that was modeled, such as seawater cooling water from an Arleigh Burke Class (DDG 51) guided missile destroyer. The use of DDG51 flow parameters for seawater cooling will overestimate the size of the thermal plume because all vessels have firemain discharge rates less than the estimated pierside seawater cooling rate of 1,680 gpm for a DDG 51 class ship. Additionally, the temperature difference (delta T) between the effluent and influent for firemain is lower (measured at 5 ° F) than the delta T for seawater cooling from a DDG 51 class ship (measured at 10 ° F).
The seawater cooling water discharge was modeled using the Cornell Mixing Zone Expert System (CORMIX) to estimate the plume size and temperature gradients in a receiving water body using conditions tending to produce the largest thermal plume. Thermal modeling was performed for the DDG 51 in two harbors (Norfolk, Virginia; and Bremerton, Washington). Of the five states that have the largest presence of Armed Forces vessels, only Virginia, and Washington have established thermal mixing zone criteria. 9 

### The discharge was also assumed to occur in winter when the discharge would produce the largest thermal plume. Based on modeling for a DDG 51 class ship, the resulting plume did not exceed the thermal mixing zone requirements for Virginia or Washington. 9



### All vessels have firemain discharge rates less than the seawater cooling discharge rate, and delta T’s less than the measured temperature difference associated with a DDG 51.

### Firemain Systems 8 Therefore, the heat rejection rate from any firemain system will be lower than that of a DDG 51 class ship for seawater cooling water. Accordingly, the resulting thermal plume for the firemain discharge is not expected to exceed the thermal criteria for , Virginia or Washington and adverse thermal effects are not anticipated.

4.4 Potential for Introducing Non-Indigenous Species
Wet and dry firemain systems have a minimal potential for transporting non-indigenous species, because the residence times for most portions of the system are short. Some portions of the system lie stagnant where marine organisms may reside. However, these areas tend to develop anaerobic conditions quickly, except at the junctions with the active portions of the system, where oxygenated water continuously flows by and through the ship. Anaerobic conditions are not hospitable to most marine organisms. Additionally, firemain systems do not transport large volumes of water over large distances.

5.0 CONCLUSIONS
Firemain discharge has the pote ntial to cause an adverse environmental effect because the concentrations of Bis(2-ethylhexyl) phthalate, nitrogen, copper, nickel, and iron exceed federal or most stringent state water quality criteria and the estimated annual mass loadings for these metals are significant. The thermal effects of this discharge were reviewed and are not significant. The potential for introducing non-indigenous species is minimal.

6.0 REFERENCES
To characterize this discharge, information from various sources was obta ined. Process information and assumptions were used to estimate the rate of discharge and sampling was performed to gather results related to the constituents and concentrations of the discharge. Table 7 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes. Firemain System Discharge. 8 October, 1996.

2. Naval Sea Systems Command, Design Practice and Criteria Manual for Surface Ship Firemain Systems, 1988.

3. Naval Sea Systems Command , Commercial General Specifications for T-ships of the United States Navy, 1991 Ed. 15 March 1991.

4. Code of Federal Regulations, 46 CFR Parts 34, 76, and 95.

### Firemain Systems 9 5. Code of Federal Regulations, 46 CFR Part 34. 10-5.

6. Weersing, Penny, Military Sealift Command Central Technical Activity. Dry firemain discharge within 12 n.m., 17 March 1997, David Eaton, M. Rosenblatt & Son.

7. Fischer, Russ, Army. Dry Firemain Discharge within 12 n.m., 13 March 1998, Ayman Ibrahim, M. Rosenblatt & Son.

8. The Internat ional Nickel Company, Guidelines for Selection of Marine Materials, 2nd Ed., May 1971.

9. NAVSEA. Thermal Effects Screening of Discharges from Vessels of the Armed Services. Versar, Inc. July 3, 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.

### Firemain Systems 10 New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Van der Leeden, et al. The Water Encyclopedia, 2nd Ed. Lewis Publishers: Chelsea, Michigan, 1990.
Malcolm Pirnie, Inc. UNDS Phase 1 Sampling Data Report, Volumes 1 through 13, October 1997.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.
UNDS Ship Database, August 1, 1997.

### Firemain Systems 11 Table 1. Wet and Dry Firemains of the Navy, MSC, USCG, and Army

Class Description Quantity of Vessels Wet/Dry

Navy Ships SSBN Ohio Class Ballistic Missile Submarines 17 Dry SSN Sturgeon Class Attack Submarines 13 Dry SSN Los Angeles Class Attack Submarines 56 Dry SSN Narwhal Class Submarine 1 Dry SSN Benjamin Franklin Class Submarines 2 Dry CV Forrestal Class Aircraft Carrier 1 Wet CVN Enterprise Class Aircraft Carrier 1 Wet CV Kitty Hawk Class Aircraft Carriers 3 Wet CVN Nimitz Class Aircraft Carriers 7 Wet CGN Virginia Class Guided Missile Cruiser 1 Wet CG Ticonderoga Class Guided Missile Cruisers 27 Wet CGN California Class Guided Missile Cruisers 2 Wet DDG Kidd Class Guided Missile Destroyers 4 Wet DDG Arleigh Burke Class Guided Missile Destroyers 18 Wet DD Spruance Class Destroyers 31 Wet FFG Oliver Hazard Perry Guided Missile Frigates 43 Wet LCC Blue Ridge Class Amphibious Command Ships 2 Wet LHD Wasp Class Amphibious Assault Ships 4 Wet LHA Tarawa Class Amphibious Assault Ships 5 Wet LPH Iwo Jima Class Assault Ships 2 Wet LPD Austin Class Amphibious Transport Docks 3 Wet LPD Amphibious Transport Docks 2 Wet LPD Amphibious Transport Docks 3 Wet LSD Whidbey Island Class Dock Landing Ships 8 Wet LSD Harpers Ferry Dock Landing Ships 3 Wet LSD Anchorage Class Dock Landing Ships 5 Wet MCM Avenger Class Mine Countermeasure Vessels 14 Wet MHC Osprey Class Minehunter Coastal Vessels 12 Wet PC Cyclone Class Coastal Defense Ships 13 Wet Navy Auxiliary Ships AGF Raleigh Class Miscellaneous Command Ship 1 Wet AGF Austin Class Miscellaneous Command Ship 1 Wet AO Jumboised Cimarron Class Oilers 5 Wet AOE Supply Class Fast Combat Support Ships 3 Wet AOE Sacramento Class Fast Combat Support Ships 4 Wet ARS Safeguard Class Salvage Ships 4 Wet AS Emory S Land Class Submarine Tenders 3 Wet AS Simon Lake Class Submarine Tender 1 Wet AGOR Gyre Class Oceanographic Research Ship 1 Dry AGOR Thompson Class Oceanographic Research Ships 2 Dry

Military Sealift Command T-AE Kilauea Class Ammunition Ships 8 Wet T-AFS Mars Class Combat Stores Ships 8 Wet T-ATF Powhatan Class Fleet Ocean Tugs 7 Dry T-AO Henry J Kaiser Class Oilers 13 Dry

### Firemain Systems 12 Class Description Quantity of Vessels Wet/Dry

T-AGM Compass Island Class Missile Instrumentation Ships 1 Dry T-ARC Zeus Class Cable Repairing Ship 1 Dry T-AKR Maersk Class Fast Sealift Ships 3 Dry T-AKR Algol Class Vehicle Cargo Ships 8 Dry T-AGOS Stalwart Class Ocean Surveillance Ships 5 Dry T-AGOS Victorious Class Ocean Surveillance Ships 4 Dry T-AG Mission Class Navigation Research Ships 2 Dry T-AGS Silas Bent Class Surveying Ships 2 Dry T-AGS Waters Class Surveying Ship 1 Dry T-AGS McDonnell Class Surveying Ships 2 Dry T-AGS Pathfinder Class Surveying Ships 4 Dry Coast Guard WHEC Hamilton and Hero Class High Endurance Cutters 12 Dry WMEC Storis Class Medium Endurance Cutter 1 Dry WMEC Diver Class Medium Endurance Cutter 1 Dry WMEC Famous Class Medium Endurance Cutters, Flight A 4 Dry WMEC Famous Class Medium Endurance Cutters, Flight B 9 Dry WMEC Reliance Class Medium Endurance Cutters, Flight A 5 Dry WMEC Reliance Class Medium Endurance Cutters, Flight B 11 Dry WAGB Mackinaw Class Icebreaker 1 Dry WAGB Polar Class Icebreakers 2 Dry WTGB Bay Class Icebreaking Tugs 9 Dry WPB Point Class Patrol Craft 36 Dry WPB Island Class Patrol Craft 49 Dry WLB Juniper Class Seagoing Buoy Tenders 2 Dry WLB Balsam Class Seagoing Buoy Tenders, Flight A 8 Dry WLB Balsam Class Seagoing Buoy Tenders, Flight B 2 Dry WLB Balsam Class Seagoing Buoy Tenders, Flight C 13 Dry WLM Keeper Class Coastal Buoy Tenders 2 Dry WLM White Sumac Class Coastal Buoy Tenders 9 Dry WLI Inland Buoy Tenders 6 Dry WLR River Buoy Tenders, 115-foot 1 Dry WLR River Buoy Tenders, 75-foot 13 Dry WLR River Buoy Tenders, 65-foot 6 Dry WIX Eagle Class Sail Training Cutter 1 Dry WLIC Inland Construction Tender, 115-foot 1 Dry WLIC Pamlico Class Inland Construction Tenders 4 Dry WLIC Cosmos Class Inland Construction Tenders 3 Dry WLIC Anvil and Clamp Classes Inland Construction Tenders 7 Dry WYTL 65 ft. Class Harbor Tugs 11 Dry Army FMS Floating Machine Shops 3 Dry LSV Frank S. Besson Class Logistic Support Vessels 6 Dry LCU 2000 Class Utility Landing Craft 48 Dry LT Inland and Coastal Tugs 25 Dry

### Firemain Systems 13 Table 2. Theoretical Upper Bound-Estimate of Annual Wet Firemain Discharge

Class Description Quantity of Vessels Flow Rate per

Vessel (GPM) Days w/in

12 n.m. Estimated Annual

Volume for Class, Gal Navy CV Forrestal Class Aircraft Carrier 1 1,000 143 205,920,000 CVN Enterprise Class Aircraft Carrier 1 1,000 76 109,440,000 CV Kitty Hawk Class Aircraft Carriers 3 1,000 137 591,840,000 CVN Nimitz Class Aircraft Carriers 7 1,000 147 1,481,760,000 CGN Virginia Class Guided Missile Cruiser 1 250 166 59,760,000 CG Ticonderoga Class Guided Missile Cruisers 27 250 161 1,564,920,000 CGN California Class Guided Missile Cruisers 2 250 143 102,960,000 DDG Kidd Class Guided Missile Destroyers 4 250 175 252,000,000 DDG Arleigh Burke Class Guided Missile Destroyers 18 500 101 1,308,960,000 DD Spruance Class Destroyers 31 250 178 1,986,480,000 FFG Oliver Hazard Perry Guided Missile Frigates 43 250 167 2,585,160,000 LCC Blue Ridge Class Amphibious Command Ships 2 400 179 206,208,000 LHD Wasp Class Amphibious Assault Ships 4 800 185 852,480,000 LHA Tarawa Class Amphibious Assault Ships 5 800 173 996,480,000 LPH Iwo Jima Class Assault Ships 2 600 186 321,408,000 LPD Austin Class Amphibious Transport Docks 3 300 178 230,688,000 LPD Amphibious Transport Docks 2 300 178 153,792,000 LPD Amphibious Transport Docks 3 300 178 230,688,000 LSD Whidbey Island Class Dock Landing Ships 8 300 170 587,520,000 LSD Harpers Ferry Dock Landing Ships 3 300 215 278,640,000 LSD Anchorage Class Dock Landing Ships 5 300 215 464,400,000 MCM Avenger Class Mine Countermeasure Vessels 14 150 232 701,568,000 MHC Osprey Class Minehunter Coastal Vessels 12 100 232 400,896,000 PC Cyclone Class Coastal Defense Ships 13 50 50 46,800,000

Navy Auxiliary AGF Raleigh Class Miscellaneous Command Ship 1 400 183 105,408,000 AGF Austin Class Miscellaneous Command Ship 1 400 183 105,408,000 AO Jumboised Cimarron Class Oilers 5 200 188 270,720,000 AOE Supply Class Fast Combat Support Ships 3 500 114 246,240,000 AOE Sacramento Class Fast Combat Support Ships 4 600 183 632,448,000 ARS Safeguard Class Salvage Ships 4 100 202 116,352,000 AS Emory S Land Class Submarine Tenders 3 400 293 506,304,000 AS Simon Lake Class Submarine Tender 1 400 229 131,904,000

Military Sealift Command T-AE Kilauea Class Ammunition Ships 8 300 183 632,448,000 T-AFS Mars Class Combat Stores Ships 8 300 45 155,520,000 Total Estimated Annual Volume, (gal): 18,623,520,000

### Firemain Systems 14 Table 3. Theoretical Upper-Bound Estimate of Annual Dry Firemain Discharge

Class Description Flow (GPM) Quantity of Vessels Days

within 12 n.m. Estimated

Annual Volume (gal) Navy SSBN Ohio Class Ballistic Missile Submarines 250 17 183 1,111,071 SSN Sturgeon Class Attack Submarines 250 13 183 849,643 SSN Los Angeles Class Attack Submarines 250 56 183 3,660,000 SSN Narwhal Class Submarine 250 1 183 65,357 SSN Benjamin Franklin Class Submarines 250 2 183 130,714 Navy Auxiliary AGOR Gyre Class Oceanographic Research Ship 50 1 113 8,071 AGOR Thompson Class Oceanographic Research Ships 100 2 113 32,286

Military Sealift Command T-ATF Powhatan Class Fleet Ocean Tugs 100 7 127 127,000 T-AO Henry J Kaiser Class Oilers 200 13 78 289,714 T-AGM Compass Island Class Missile Instrumentation Ships 100 2 133 38,000 T-AH Mercy Class Hospital Ships 400 2 184 210,286 T-ARC Zeus Class Cable Repairing Ship 100 1 8 1,143 T-AKR Maesrk Class Fast Sealift Ships 400 3 59 101,143 T-AKR Algol Class Vehicle Cargo Ships 400 8 350 1,600,000 T-AGOS Stalwart Class Ocean Surveillance Ships 200 5 70 100,000 T-AGOS Victorious Class Ocean Surveillance Ship 200 4 107 122,286 T-AG Mission Class Navigation Research Ships 200 2 151 86,286 T-AGS Silas Bent Class Surveying Ships 200 2 44 25,143 T-AGS Waters Class Surveying Ship 200 1 7 2,000 T-AGS McDonnel Class Surveying Ships 200 2 96 54,857 T-AGS Pathfinder Class Surveying Ships 200 4 96 109,714 Coast Guard WHEC Hamilton and Hero Class High Endurance Cutters 250 12 151 647,143 WMEC Storis Class Medium Endurance Cutter 250 1 167 59,643 WMEC Diver Class Medium Endurance Cutters 250 1 98 35,000 WMEC Famous Class Medium Endurance Cutters, Flight A 250 4 137 195,714 WMEC Famous Class Medium Endurance Cutters, Flight B 250 9 164 527,143 WMEC Reliance Class Medium Endurance Cutters, Flight A 250 5 235 419,643 WMEC Reliance Class Medium Endurance Cutters, Flight B 250 11 149 585,357 WAGB Mackinaw Class Icebreaker 250 1 365 130,357 WAGB Polar Class Icebreaker 250 2 365 260,714 WTGB Bay Class Icebreaking Tugs 250 9 365 1,173,214 WPB Point Class Patrol Craft 50 36 157 403,714 WPB Island Class Patrol Craft 50 49 157 549,500 WLB Juniper Class Seagoing Buoy Tenders 200 16 290 1,325,714

### Firemain Systems 15 Class Description Flow (GPM) Quantity of Vessels Days

within 12 n.m. Estimated

Annual Volume (gal) WLB Balsam Class Seagoing Buoy Tenders, Flight A 200 8 290 662,857 WLB Balsam Class Seagoing Buoy Tenders, Flight B 200 2 220 125,714 WLB Balsam Class Seagoing Buoy Tenders, Flight C 200 13 223 828,286 WLM Keeper Class Coastal Buoy Tenders 100 2 323 92,286 WLM White Sumac Class Coastal Buoy Tenders 100 9 223 286,714 WLI Inland Buoy Tenders 100 6 365 312,857 WLR River Buoy Tenders, 115-foot 100 1 365 52,143 WLR River Buoy Tenders, 75-foot 100 13 365 677,857 WLR River Buoy Tenders, 65-foot 100 6 365 312,857 WIX Eagle Class Sail Training Cutter 50 1 188 13,429 WLIC Inland Construction Tenders, 115 foot 50 1 365 26,071 WLIC Pamlico Class Inland Construction Tenders 50 4 365 104,286 WLIC Cosmos Class Inland Construction Tenders 50 3 365 78,214 WLIC Anvil and Clamp Classes Inland Construction Tenders 50 27 365 703,929

WYTL 65 ft. Class Harbor Tugs 50 14 350 350,000 Army FMS Floating Machine Shops 400 3 350 600,000 LSV Frank S. Besson Class Logistic Support Vessel 564 6 180 870,171 LCU 2000 Class Utility Landing Craft 500 48 335 11,485,714 LT Inland and Coastal Tugs 640 25 295 3,371,429 Total Estimated Annual Volume, (gal): 35,992,385

Note: 1. Estimates assume that all discharge is due to maintenance or testing. All fire fighting exercises are assumed to occur at sea beyond 12 n.m. Maintenance is assumed to occur weekly while vessels are in port, with seawater flowing at the design rate of the pumps for 5 minutes each week.

### Firemain Systems 16 Table 4: Summary of Detected Analytes Firemain Systems

Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Log Normal

Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Effluent-Influent

Log Normal mean Mass loading

(lbs/yr) Seawater Cooling Firemain Influent Seawater Cooling Firemain Effluent Classicals (mg/L) ALKALINITY 77.24 3 of 3 72 80 79.12 3 of 3 72 86 1.88 291,179 AMMONIA AS NITROGEN 0.10 2 of 3 BDL 0.18 0.07 1 of 3 BDL 0.11 -0.03 (b) CHEMICAL OXYGEN DEMAND 132.28 3 of 3 106 179 105.96 2 of 3 BDL 195 -26.32 (b) CHLORIDE 10497.14 3 of 3 10200 10800 10750.73 3 of 3 9780 12100 253.59 39,276,577 NITRATE/ NITRITE 0.06 2 of 3 BDL 0.34 0.02 1 of 3 BDL 0.4 -0.04 (b) SULFATE 1273.43 3 of 3 1160 1380 1245.96 3 of 3 1190 1290 -27.47 (b) TOTAL DISSOLVED SOLIDS- 19705.66 3 of 3 18300 20700 18261.70 3 of 3 16900 19800 -1443.96 (b) TOTAL KJELDAHL NITROGEN 0.31 2 of 3 BDL 0.95 0.48 3 of 3 0.23 0.84 0.17 26,330 TOTAL ORGANIC CARBON 1.72 2 of 3 BDL 3.2 1.72 2 of 3 BDL 3.2 0 0 TOTAL PHOSPHOROUS 0.15 3 of 3 0.13 0.19 0.15 3 of 3 0.13 0.2 0 0 TOTAL RECOVERABLE OIL AND GREASE 2.79 3 of 3 0.9 5.6 2.16 2 of 3 BDL 10.9 -0.63 (b)

TOTAL SULFIDE (IODOMETRIC) 7.00 2 of 2 BDL 7 6.54 3 of 3 5 8 -0.46 (b) TOTAL SUSPENDED SOLIDS 21.09 3 of 3 19 26 20.05 3 of 3 12 28 -1.04 (b) VOLATILE RESIDUE 9016.50 3 of 3 1920 20200 8755.30 3 of 3 2230 19800 -261.2 (b)

Metals ( μ g/L) ALUMINUM Dissolved 37.44 1 of 3 BDL 78.1

- - - - - - Total 197.35 2 of 3 BDL 732 85.79 1 of 3 BDL 805.5 -111.56 (b) ANTIMONY Dissolved 7.08 1 of 3 BDL 23.7

- - - - - - ARSENIC Dissolved 1.79 1 of 3 BDL 5 2.64 2 of 3 BDL 5 0.85 132 Total 1.27 2 of 3 BDL 3.4 2.71 1 of 3 BDL 5 1.44 223 BARIUM Dissolved 20.43 3 of 3 16.5 25.6 18.0 3 of 3 13.4 26.5 -2.39 (b) Total 21.65 3 of 3 16.1 25.3 23.7 3 of 3 17.7 29.7 2.09 324 BORON Dissolved 2109.70 3 of 3 2010 2290 2110 3 of 3 1930 2340 -3.1 (b) Total 2076.31 3 of 3 2040 2130 2160 3 of 3 2080 2320 80.8 12,514 CALCIUM Dissolved 198376.19 3 of 3 190000 214000 195800 3 of 3 179500 219000 -2560.58 (b) Total 196332.23 3 of 3 187000 213000 198600 3 of 3 186000 217000 2242.88 347,382 COPPER Dissolved 8.43 2 of 3 BDL 13.3 24.9 2 of 3 BDL 150 16.46 2,549 Total 16.82 3 of 3 13.1 21.9 62.4 3 of 3 34.2 143 45.59 7,061

### Firemain Systems 17 Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Log Normal

Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Effluent-Influent

Log Normal mean Mass loading

(lbs/yr) Seawater Cooling Firemain Influent Seawater Cooling Firemain Effluent IRON Dissolved

- - - - 20.3 1 of 3 BDL 189 20.3 (a) 3,138 (a) Total 348.48 3 of 3 161 824 370 3 of 3 95.4 910.5 21.28 3,296 MAGNESIUM Dissolved 673065.05 3 of 3 634000 697000 657000 3 of 3 590000 698000 -15948.78 (b) Total 674584.89 3 of 3 664000 689000 672000 3 of 3 663000 678000 -2782.22 (b) MANGANESE Dissolved 11.12 3 of 3 9.4 12.5 10.77 3 of 3 7.4 13.3 -0.35 (b) Total 17.32 3 of 3 11.4 24.5 19.00 3 of 3 12.2 27.2 1.68 260 MOLYBDENUM Dissolved 7.21 2 of 3 BDL 25.5

- - - - - - Total 4.51 1 of 3 BDL 6.1 3.29 1 of 3 BDL 10.8 -1.22 (b) NICKEL Dissolved

- - - - 13.8 1 of 3 BDL 38.9 13.83 (a) 2,142 (a) Total

- - - - 15.2 1 of 3 BDL 52.1 15.24 (a) 2,360 (a) SELENIUM Dissolved 16.90 1 of 3 BDL 48.3 14.9 1 of 3 BDL 56.7 -1.96 (b) SODIUM Dissolved 5743515.23 3 of 3 5540000 6140000 5710000 3 of 3 5190000 6160000 -37826.6 (b) Total 5782507.24 3 of 3 5500000 6030000 5780000 3 of 3 5585000 6160000 -37.06 (b) THALLIUM Dissolved 6.80 1 of 3 BDL 12.6 6.52 1 of 3 BDL 11.1 -0.28 (b) Total 7.15 1 of 3 BDL 14.6 7.27 1 of 3 BDL 15.4 0.12 19 TIN Dissolved 7.03 1 of 3 BDL 6.2

- - - - - - TITANIUM Total 7.60 2 of 3 BDL 23.7 7.67 2 of 3 BDL 25.8 0.07 11 ZINC Dissolved 15.67 2 of 3 BDL 40.5 24.2 3 of 3 21.2 29.5 8.54 1,323 Total 22.76 3 of 3 20 25.1 31.3 3 of 3 21.3 44.9 8.55 1,324 Organics ( μ g/L) BIS(2-ETHYLHEXYL) PHTHALATE - - - - 22.0 1 of 3 BDL 428 22.04 (a) 3,414 (a)

BDL= Below Detection Level note (a) - No background concentration is given for the parameter - therefore an influent concentration of zero was used to determine a conservative mass loading note (b) - Mass loading was not determined for parameters for which the influent concentration exceeded the effluent

Log normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., "non-detect" samples), estimated analyte concentrations equivalent to one-half of the detection levels were used to calculate the mean. For example, if a "non-detect" sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the log normal mean calculation.

### Firemain Systems 18 Table 5. Estimated Annual Mass Loadings of Constituents

Constituent * Log-normal Mean

Influent ( μ g/L) Log-normal Mean

Effluent ( μ g/L) Log-normal Mean

Concentration ( μ g/L) Estimated Annual

Mass Loading (lbs/yr) Bis(2-ethylhexyl) phthalate - 22 22.04 3,414

Nitrate/Nitrite 60 20 -40 (a) Total Kjeldahl Nitrogen 310 480 170 26,330

Total Nitrogen* 26,330 Copper Dissolved 8.43 24.9 16.46 3,111 Total 16.82 62.4 45.59 8,618 Iron Total 348.48 370 21.28 4,022 Nickel Dissolved

- 13.8 13.8 (b) 2,142 (b) Total

- 15.2 15.2 (b) 2,360 (b) * Mass loadings are presented for constituents that exceed WQC only. See Table 4 for a complete listing of mass loadings.

Notes: * Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen. (a) - Mass loading was not determined for parameters for which the influent concentration exceeded the effluent (b) - No background concentration is given for the parameter

### Firemain Systems 19 Table 6. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituents Log-normal

Mean Effluent Minimum

Concentration Effluent Maximum

Concentration Effluent Federal

Chronic WQC Most Stringent State

Chronic WQC

Classicals ( μ g/L) Nitrate/Nitrite 20 BDL 400 None 8 (HI) A Total Kjeldahl Nitrogen 480 230 840 None

- Total Nitrogen B 500 None 200 (HI) A Organics ( μ g/L) Bis(2-ethylhexyl) phthalate 22 BDL 428 None 5.92 (GA)

Metals ( μ g/L) Copper Dissolved 24.9 BDL 150 2.4 2.4 (CT, MS) Total 62.4 34.2 143 2.9 2.9 (GA, FL) Iron Total 370 95.4 911 None 300 (FL) Nickel Dissolved 13.8 BDL 38.9 8.2 8.2 (CA, CT) Total 15.2 BDL 52.1 8.3 7.9 (WA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen. BDL-Below Detection Level

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Firemain Systems 20 Table 7. Data Sources

Data Sources NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents X 4.1 Mass Loadings X 4.2 Environmental Concentrations X X 4.3 Thermal Effects X X4.4 Potential for Introducing NonIndigenous Species X

### Freshwater Layup 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for

“ ...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces,

... ” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)

— either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Freshwater Layup

### Freshwater Layup 2 2.0 DISCHARGE DESCRIPTION
This section describes the freshwater layup discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Seawater cooling systems on vessels provide cooling water for propulsion plant and auxiliary system heat exchangers. Heat exchangers remove heat directly from the main propulsion machinery and the electrical generating plants, and directly or indirectly from all other equipment requiring cooling. The primary purpose of the main seawater system is to provide the coolant to condense low pressure steam from the main turbines and the generator turbines. 1



### When nuclear-powered submarines and aircraft carriers remain for an extended period and the seawater cooling systems are not circulated, the main condensers are placed in a freshwater layup. 1 

### The purpose of placing the condensers in a freshwater layup is to prevent the accumulation of biological growth and the resultant loss of condenser efficiency while the seawater cooling system is not in use. The propulsion plants of nuclear-powered vessels generally require a 2- to 3-day cooling down period prior to being laid up. 1



### The layup is accomplished by blowing the seawater from the main condensers with low pressure air and isolating the condensers. 1 

### The condensers are then filled with potable water from port facilities, a process that takes 1 to 2 hours, or more, to complete. 2 

### The potable water remains in the condensers, uncirculated, for approximately 2 hours. After this period of time, the potable water fill is blown overboard with low pressure air, which takes approximately an hour to accomplish. 1,2 

### The condensers are then considered flushed of any residual seawater (seawater or potable water). The condensers are then refilled with potable water for the actual layup. This process can be referred to as a double fill and flush cycle.
After 21 days, the initial fill water is discharged overboard and replaced. 1 

### The layup is discharged and refilled on a 30-day cycle thereafter. 1 

### This process can be referred to as a refill cycle. The freshwater layup may be terminated at any point during these cycles to support equipment maintenance or ship ’ s movement. 1



### During a ship check and sampling episode aboard USS Scranton (SSN 756), it was observed that the main seawater condensers were filled indirectly with freshwater from port facilities. 3 

### The crew filled the forward potable water tank from the pier connection and then transferred the freshwater to the aft potable water tank. 3 

### The main condensers were then put in freshwater layup from the aft potable water tank. 3 

### The initial freshwater layup process lasted greater than 5 hours (e.g., from the beginning of initial fill to initiating the low pressure air blow to remove the initial freshwater flush). 3



### The main steam condensers on submarines are constructed either of ti tanium or 70/30 copper/nickel alloy. 4 

### Aircraft carrier main seawater condensers are constructed of 90/10

### Freshwater Layup 3 copper/nickel alloy. The condenser boxes for the 70/30 copper/nickel alloy condensers are constructed of a nickel/copper alloy and can be lined with a tin/lead solder and have zinc anodes installed for corrosion control. 4 

### The seawater piping that carries cooling water from the condensers to overboard discharge is constructed of 70/30 copper/nickel piping. 4



### 2.2 Releases to the Environment

These dis charges occur in port at pierside when the submarine ’ s nuclear power plant has cooled and the main seawater cooling system is unable to be circulated for more than 3 days. Also, this discharge can occur if the ship will be in port for greater than 7 days (i.e., It takes 72 hours to cool down a reactor and 72 hours to ramp up a reactor which translates to six days, or roughly one week.) and the seawater cooling system can not be circulated. The freshwater is discharged from the seawater cooling piping openings located below the waterline of the ship. The discharge occurs when the fresh water is pushed out by low pressure air applied to the seawater cooling piping system. It is expected that this discharge will contain many of the constituents found in the fresh water (typically supplied by port facilities) used for the layup, as well as metals leached from the ship ’ s piping system while the water is held during the layup, and any residual seawater remaining in the system after the double fill and flush.

2 .3 Vessels Producing the Discharge

All attack submarines (SSNs), ballistic missile submarines (SSBNs), and nuclearpowered carriers (CVNs) generate this discharge. A total of 89 SSNs and SSBNs, and eight CVNs are currently in service in the Navy. While the three existing nuclear guided missile cruisers (CGNs) also produce this discharge, these are scheduled to be removed from service by 2003/2004, and therefore, will not be considered further. The Navy is the only member of the Armed Forces that operates nuclear-powered vessels.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
This discharge only occurs when vessels are in port.

3.2 Rate
The volume of the initial fill and flush of a nuclear-powered submarine is approximately 6,000 gallons of freshwater. This 6,000 gallons of freshwater is discharged overboard after a 1- to 2-hour layup in the main seawater condensers and refilled with an additional 6,000 gallons of

### Freshwater Layup 4 freshwater as described in Section 2.1. 5 

### The total volume of freshwater required for the fill, flush, and refill of the condenser for freshwater layup on nuclear submarines is approximately 12,000 gallons, of which 6,000 gallons is discharged overboard. 5 

### The volume of this discharge will vary with the volumes of the main steam condensers for each submarine class. 5



### The amount of time that a submarine is in port, and hence, the number of layup cycles required, is dependent upon many factors, the most critical being the submarine ’ s current mission. Each mission requires varying times in port for preparation, repairs, or modifications to support the mission specifics. In addition, many submarines undergo overhauls or other maintenance and/or repair activities that extend their time in port (e.g., must put their seawater systems into a dry layup condition).
Attack submarines (SSNs) average about 10 layup cycles per year, including five double fill and flush cycles and five refill cycles. 5 

### Each double fill and flush cycles and each refill cycle discharges approximately 6,000 gallons of freshwater per evolution. This results in 60,000 gallons of freshwater for each of the Navy ’ s 72 SSNs per year. Therefore, fleet-wide discharge for the SSNs is 4,320,000 gallons of freshwater layup discharge per year, of which half is from the initial fill and half is from the refill cycles, or 2,160,000 gallons for each.
Ballistic missile submarines (SSBNs) have extended layovers of 1 to 1 1/2 months approximately three or four times per year. The volume of seawater systems in ballistic missile submarines are comparable to those of attack submarines. These submarines have an estimated three initial flush and fill cycles per year and approximately six refill cycles per year. 5 

### For an SSBN, this totals 54,000 gallons per submarine per year. The Navy operates 17 SSBNs. Therefore, the total freshwater layup discharged for all SSBNs is estimated to be 918,000 gallons per year, of which 306,000 gallons is from the initial fill and flush and 612,000 gallons is from refill cycles.
A total estimated volume of 5,238,000 gallons of freshwater layup is discharged in U.S. ports from the 89 SSN and SSBN hulls. The initial fill cycle accounts for 2,466,000 gallons and the refill cycles account for 2,772,000 gallons.
Nuclear powered aircraft carriers do establish freshwater layups in their various condensers, but the effluent is dumped into the bilges of the ship rather than being discharged directly overboard. Hence, the residual water from the aircraft carriers ’ layup is covered under the Surface Vessel Bilgewater/OWS Nature of Discharge report.

3.3 Constituents
The freshwater used in the freshwater layup can contain disinfectants from potab le water treatment. The most common disinfectant is chlorine. Some municipalities, however, are switching over to chloramine disinfection to reduce the amount of disinfectant by-products formed. This switch could be permanent or seasonal, with the chloramines added during the warmer months when formation of disinfectant by-products are more prevalent. It is noted that

### Freshwater Layup 5 the constituent make-up of the freshwater used to conduct the layup will have a significant effect on the discharge.

The constituents t hat can be present in freshwater layup from nuclear-powered submarines include: copper, lead, nickel, chlorine, ammonia, nitrogen (as nitrate/nitrite, and total kjeldahl nitrogen), phosphorous and related disinfectants, chromium, tin, titanium and zinc. Chromium, copper, lead, nickel, and zinc are priority pollutants. None of these constituents are bioaccumulators. The freshwater layup of a single submarine was sampled to determine the constituents that are present in the discharge.

3.4 Concentrations
The water used to fill the main condensers, the initial layup discharge, and an extended, 21-day discharge were sampled from USS Scranton (SSN 756). 3 

### A total of 17 metals were measurable in the initial and extended layup discharges from the sampling event. The vast majority of the metals detected have sources from either the materials within the main steam condenser or from the domestic water treatment/distribution system. The metals and classical parameters detected in the discharge are compiled in Table 1. In addition, the mass loadings are estimated for those constituents that were detected in either the 2-hour or 21-day layup discharges. Three priority pollutant metals, copper, nickel and zinc, were detected in the discharge at elevated concentrations. Total chlorine was also detected in the initial layup discharge (28 μ g/L), but not in the discharge after 21 days. The domestic water from the pier connection was also sampled for total and free residual chlorine levels and contained 1,200 μ g/L and 1,000 μ g/L, respectively. 3 

### Nitrogen (as nitrate/nitrite, and total kjeldahl nitrogen), ammonia, and phosphorous were detected in both the 2-hour layup and the 21-day layup discharges.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
Based upon the concentrations of the metals reported for the layup effluents in Table 1 and the estimated discharge volumes in Section 3.2, the mass loadings were calculated using the estimated volumes of freshwater layup discharge in Table 2 for those constituents that exceeded either Federal or most stringent state water quality criteria (WQC). Table 3 highlights the constituents that exceed WQC. The estimated mass loadings, provided in Table 2, are derived by adding together contributions from both the initial fill volumes and the refill cycle volumes, because the two portions of the effluent have different concentrations.

### Freshwater Layup 6 Based on the sampling data, the total fleet-wide loadings of ammonia, nitrogen, chlorine, copper, nickel, phosphorous, and zinc from this discharge are approximately 41, 55, 1, 7, 36, 8, and 29 pounds per year, respectively.

4.2 Environmental Concentrations
The discharge concentrations presented in Table 3 are compared to Federal and most stringent state WQC.
Copper was present in the fill water from the aft potable water tank, but it is unknown if copper was present in domestic water from the pier connection. The fill water copper concentrations exceeded Federal and the most stringent state. Copper is normally present in thedomestic water supply in concentrations that exceed WQC because of the presence of copperconstructed components in drinking water distribution systems. The levels of copper can be partially attributable to the construction of the potable water systems on board the submarine through which the domestic water was routed prior to filling the main seawater condensers. These systems have copper piping and brass valves that can contribute copper to the water.

Table 3 shows the concentrations of the three priority pollutant metals (copper, nickel, and zinc) that exceed Federal and most stringent state WQC. The chlorine concentration from the initial 2-hour layup exceeds the most stringent state criterion. Ammonia, total nitrogen (as nitrate/nitrite, and total kjeldahl nitrogen), and total phosphorous concentrations in the two layup discharges exceed the most stringent state criterion. The presence of phosphorous in the effluent appears to be from the domestic water as the effluent concentrations for total phosphorous shows no increase over the fill water concentrations.

4.3 Potential for Introducing Non-Indigenous Species
There is no movement of the vessel during the layup process and the water used for the layup is chlorinated domestic water from shore facilities. As such, there is no potential for transporting non-indigenous species.

5.0 CONCLUSION
Freshwater layup of seawater cooling systems has a low potential of adverse environmental effects for the following reasons.

1. The mass loadings of chlorine, copper, nickel, and zinc are small although the concentrations exceed Federal and most stringent state WQC. The mass loadings of ammonia, nitrogen, and phosphorous are also small, but concentrations exceed the most stringent state WQC. The total annual mass loadings for ammonia, (conc. μ g/L)(g/1,000,000 μ g) (lbs/453.593 g) (annual volume gal/yr) (3.785 l/gal) = mass loading (lbs/yr)

### Freshwater Layup 7 nitrogen, chlorine, copper, nickel, phosphorous, and zinc contribute approximately 41, 55, 1, 7, 36, 8, and 29 pounds, respectively. The 89 submarines producing this discharge are geographically dispersed over seven ports.

2. There is no potential for the transfer of non-indigenous species.

6.0 DATA SOURCES AND REFERENCES
Process knowledge and sampling of this discharge were used in preparing this NOD report. Table 4 shows the sources of data used to develop this NOD report. The specific references cited in the report are shown below.
Specific References

1. Kurz, Rich, NAVSEA 92T251. UNDS Equipment Expert Meeting Structured Questions. Main Sea Water System Freshwater Layup. September 5, 1996.

2. Versar Notes, UNDS Freshwater Layup Sampling Meeting. NAVSEA. May 23, 1997.

3. UNDS Phase I Sampling Data Report, Volumes 1 - 13. October 1997.

4. Bredehorst, Kurt, NAVSEA 03L. Materials Within the Seawater Side of Main Condenser. September 1996. Miller, Robert B, M. Rosenblatt & Son, Inc.

5. Miller, Robert B., M. Rosenblatt & Son, Inc. Personal Communications on Nature of Discharge Report: Freshwater Layup, Submarine Main Steam Condensers. January 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States ’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.

### Freshwater Layup 8 Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
UNDS Equipment Expert Meeting Minutes. Seawater Cooling Water Overboard. August 27, 1996.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, pg. 15366. March 23, 1995.
Kurz, Rich, NAVSEA 92T251. Submarine Main Steam Condenser Freshwater Layup E-mail. November 1996. H. Clarkson Meredith, III, Versar, Inc.
Jane's Fighting Ships, Capt. Richard Sharpe, Ed., Jane's Information Group, Sentinel House: Surrey, United Kingdom, 1996.
UNDS Ship Database, August 1, 1997.

### Freshwater Layup 9 Table 1. Summary of Detected Analytes

Constituent Freshwater Influent 2-Hour

Freshwater Effluent 21-Day

Freshwater Effluent Frequency of

Detection Mass Loading

Classicals (mg/L) (mg/L) (mg/L) (lbs/yr) Alkalinity 26 27 46 1 of 1 1,616 Ammonia as Nitrogen 0.17 1.3 0.6 1 of 1 41 Chemical Oxygen Demand (COD) 12 BDL 48 1 of 1 1,108 Chloride 20 63 34 1 of 1 2,078 Nitrate/Nitrite 0.62 0.68 0.4 1 of 1 23 Sulfate 21 22.8 17 1 of 1 861 Total Chlorine 1.2 0.028 BDL 1 of 1 0.58 Total Dissolved Solids 140 232 82 1 of 1 6,657 Total Kjeldahl Nitrogen 0.70 0.63 0.81 1 of 1 32 Total Organic Carbon (TOC) 2.70 2.7 25 1 of 1 633 Total Phosphorous 0.22 0.19 0.19 1 of 1 8.3 Total Recoverable Oil and Grease 1.0 BDL 1.0 1 of 1 23 Total Sulfide (Iodometric) 6 3.0 BDL 1 of 1 62 Volatile Residue 76 165 BDL 1 of 1 3,388

Metals ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) Aluminum Dissolved BDL 57.7 BDL 1 of 1 1.19 Total 109 43.9 BDL 1 of 1 0.90 Arsenic Dissolved BDL 0.8 BDL 1 of 1 0.016 Barium Dissolved 35.5 27.5 25.6 1 of 1 1.16 Total 36.2 28.10 26.3 1 of 1 1.19 Beryllium Dissolved BDL BDL 0.75 1 of 1 0.017 Boron Dissolved BDL 36.8 BDL 1 of 1 0.76 Total BDL 37.5 BDL 1 of 1 0.77 Calcium Dissolved 15700 17050 19800 1 of 1 807 Total 16000 16750 20400 1 of 1 815 Copper Dissolved 135 137 107 1 of 1 5.3 Total 136 150 148 1 of 1 6.5 Lead Dissolved BDL BDL 3.45 1 of 1 0.08 Total 2.3 2.0 4.75 1 of 1 0.15 Magnesium Dissolved 2720 6880 5185 1 of 1 261 Total 2860 6890 5495 1 of 1 268 Manganese Dissolved BDL 19.7 276 1 of 1 6.8 Total 6.3 21.8 310 1 of 1 7.6 Nickel Dissolved BDL 409 1175 1 of 1 35.6

### Freshwater Layup 10 Total BDL 433 1175 1 of 1 36.1 Selenium Dissolved BDL BDL 2.45 1 of 1 0.057 Total BDL BDL 1.60 1 of 1 0.037 Sodium Dissolved 10500 39200 17800 1 of 1 1,216 Total 10500 37550 21400 1 of 1 1,265 Thallium Dissolved BDL 0.75 BDL 1 of 1 0.015 Total 1.3 BDL BDL 1 of 1 (a) Tin Dissolved 5.1 BDL BDL 1 of 1 (a) Total 4.2 BDL 2.75 1 of 1 0.06 Zinc Dissolved 137 463 784 1 of 1 27.7 Total 127 451 851 1 of 1 29

Organics ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) Bis(2-ethylhexyl) phthalate 137 BDL BDL 1 of 1 (a)

BDL - Denotes the below the detection for the method and instrument. (a) No mass loadings are calculated for constituents that were not detected in either the 2-hour or 21-day freshwater layup discharge.
Log normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., "non-detect" samples), estimated analyte concentrations equivalent to one-half of the detection levels were used to calculate the mean. For example, if a "non-detect" sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the log normal mean calculation.

### Freshwater Layup 11 Table 2: Estimated Annual Mass Loadings for Freshwater Layup Discharge

Analyte 2-hr Layup

Conc. ( μ g/L) Estimated

Mass Loadings (lbs/yr) 21-day Layup

Conc. ( μ g/L) Frequency

of Detection Estimated

Mass Loadings (lbs/yr) Total Estimated

Loadings, Freshwater Layup (lbs/yr) Fleetwide Annual Volume (gal/yr): 2,466,000 2,772,000 Copper Dissolved 137 2.8 107 1 of 1 2.5 5.3 Total 150 3.1 148 1 of 1 3.4 6.5 Nickel Dissolved 409 8.4 1175 1 of 1 27.2 35 Total 433 8.9 1175 1 of 1 27.2 36 Zinc Dissolved 463 9.5 784 1 of 1 18.7 27 Total 451 9.3 851 1 of 1 19.7 29 Ammonia as Nitrogen 1300 27 600 1 of 1 14 41 Nitrate/Nitrite 680 14 400 1 of 1 9 23 Total Kjeldahl Nitrogen 630 14 810 1 of 1 18 32 Total Nitrogen A 1310 28 1210 27 55 Total Chlorine 28 0.58

- 1 of 1

- 0.58 Total Phosphorous 190 3.9 190 1 of 1 4.4 8.3 A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Freshwater Layup 12 Table 3: Mean Concentrations of Constituents Exceeding Water Quality Criteria

Constituent 2-Hour Layup Concentration 21-Day Layup

Concentration Federal Acute

WQC Most Stringent State

Acute WQC Metals ( μ g/L) Copper Dissolved 137 107 2.4 2.4 (CT, MS) Total 150 148 2.9 2.5 (WA) Nickel Dissolved 409 1175 74 74 (CA, CT) Total 433 1175 74.6 8.3 (FL, GA) Zinc Dissolved 463 784 90 90 (CA, CT, MS) Total 451 851 95.1 84.6 (WA) Classicals (mg/L) Ammonia as Nitrogen 1.3 0.6 None 0.006 (HI) A Nitrate/Nitrite 0.68 0.4 None 0.008 (HI) A Total Kjeldahl Nitrogen 0.63 0.81 None

- Total Nitrogen B 1.31 1.21 None 0.2 (HI) A Total Chlorine 0.028

- None 0.010 (FL) Total Phosphorous 0.19 0.19 None 0.025 (HI) A
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Freshwater Layup 13 Table 4. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and 3Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents X X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Gas Turbine Water Wash 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Gas Turbine Water Wash

### Gas Turbine Water Wash 2 2.0 DISCHARGE DESCRIPTION
This section describes the gas turbine water wash and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Shipboard gas turbine systems are used on certain vessels to provide propulsion power, provide initial mechanical starting power for large gas turbine propulsion systems, and to generate electricity. Power is generated by combusting fuel in a “gas generator” (commonly referred to as a “combustor”). The combustor exhaust gas rotates the “power turbine,” providing the mechanical energy to either drive a propulsion shaft, start a larger turbine, or generate electricity. 1



### Over extended periods of operation, residual lubrication oil and hydrocarbon combustion by-product deposits can form on gas turbine internals. Since naval vessels operate in a marine environment, salt water introduced with intake air can also lead to salt deposits on the gas turbine internals. Washing the gas turbine internals periodically with a solution of freshwater and cleaning compound maintains operating efficiency and prevents corrosion of the metallic components. The cleaning compound that is currently used for this purpose is a petroleum-based solvent referred to as “gas path cleaner.” 1



### Two types of water wash systems exist on vessels with gas turbines. One is a dedicated “hard-piped” system; the other type requires manual attachment of a hose to a hot water source and placement of the other hose end into the turbine plenum. Both of these systems are designed to introduce water wash into the turbine housing while the turbine starter motor is slowly rotated, (i.e., cranked without combustion). The hard-piped system includes a rinse tank where distilled/demineralized water and cleaning compound are mixed. The contents of the tank are sprayed into the gas turbine under pressure, either by using a pump or by pressurizing the tank with compressed air. 1 

### Immediately following the wash, the engine is sprayed with water.
Gas turbine engines are enclosed in a “module” with floor drains designed to remove minor leakage of fuel and synthetic lube oil that may occur during normal turbine operation. The floor drains also remove any water wash introduced into the turbine that is not discharged to the atmosphere. Water wash from external scrubbing of the gas turbine also flows to these floor drains. Inadvertent spills of synthetic lube oil that occasionally occur during turbine maintenance activities are potentially capable of entering the drains; however, standard procedure is for ship personnel to immediately contain and wipe up any spillage that occurs. 1



### On most Navy ships, gas turbine water wash effluent and any drainage of residual material from leaks and spills are collected and held in a dedicated tank system for shore disposal. The Navy refers to this system as the “Gas Turbine Waste Drain Collecting System.” The dedicated system includes a centrifugal pump and piping to transfer the water wash to a hose connection topside. A hose is used to transfer the water wash to a pierside collection facility. On

### Gas Turbine Water Wash 3 vessels without this system, the drainage is discharged to the environment as a component of other UNDS discharges (i.e., Surface Vessel Bilgewater/OWS, Welldeck, and Deck Runoff). 1



### The wash water effluent discharge from U.S. Coast Guard (USCG) vessel gas turbine washing operations is to the bilge, from where it is processed as bilgewater (along with other bilgewater contributors) through the shipboard OWS prior to overboard discharge. The gas turbine water wash effluent for USCG vessels is addressed as a component of the Surface Vessel Bilgewater/OWS Discharge NOD Report.
Gas turbine propulsion engines are also used aboard Navy landing craft air cushion (LCAC) amphibious landing crafts. Two gas turbine auxiliary power units (APUs) are also installed on LCACs to provide starter air. The LCAC gas turbine washwater discharge is addressed as a component of the Welldeck Discharges NOD Report.
Water wash cleaning of aircraft gas turbine engines aboard an aircraft carrier is addressed as a component of the Deck Runoff NOD Report.

2.2 Releases to the Environment
The water wash introduced into Navy propulsion turbines contains water and solventbased gas path cleaner. The discharge could be expected to contain components of the cleaner, oil and grease (O&G), petroleum-derived fuel and lubricant constituents, synthetic lubricating oil, constituents introduced into the turbine system with the incoming sea air, hydrocarbon combustion by-products, and metals leached from gas turbine components. On most gas turbine Navy and MSC ships, gas turbine washwater is collected in a dedicated tank and not discharged overboard within 12 n.m. On ships without a dedicated collecting tank, this discharge is a component of deck Runoff, welldeck runoff, or bilgewater as described in the previous section.

2.3 Vessels Producing the Discharge
Table 1 lists the vessel classes that have shipboard gas turbine systems. Vessel classes equipped with a Gas Turbine Waste Drain Collecting System are denoted in Table 1. For the other vessel classes listed in Table 1, the gas turbine water wash is discharged as a component of another UNDS discharge. The maximum number of vessels with Gas Turbine Waste Drain Collecting System is 127. Army and Air Force vessels do not have gas turbine engines and do not generate this discharge.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

### Gas Turbine Water Wash 4 3.1 Locality
Vessels with Gas Turbine Waste Drain Collecting Systems collect and store drai nage from normal turbine operations and water wash effluent for pierside disposal. On most gas turbine Navy and MSC ships, gas turbine washwater is collected in a dedicated collecting tank and not discharged overboard within 12 n.m. On ships without a dedicated collecting tank, this discharge is a component of deck Runoff, welldeck runoff, or bilgewater as described in the previous section.

3.2 Rate
Available information on gas turbine water wash usage rates is contained in gas turbine design and operations and maintenance documentation. 2,3,4 

### The frequency of water wash cleanings and the quantity of water wash consumed per washing event is different between USCG, Navy, and Military Sealift Command (MSC) vessels.
Navy and MSC vessel gas turbines used for propulsion are washed after each 48 hours of operation or at least once per month. 5 

### Two gallons of the gas path cleaner are initially mixed with 38 gallons of distilled/demineralized water. Immediately following the wash, the turbine is spray rinsed with 80 gallons of water. An additional 2 gallons of detergent/water mixture is used to clean external turbine surfaces, as necessary. Each cleaning of the propulsion turbines produces 122 gallons of water wash. Therefore a vessel with four propulsion gas turbines each cleaned once every 48 hours of operation would generate an average of 244 gallons of water wash per day.

3.3 Constituents
The chemicals used in gas turbine operation and maintenance that could potentially contribute to contamination of turbine water wash are gas path cleaner, Naval distillate fuel F-76, gas turbine fuel, JP-5, synthetic lube oil, copper, cadmium, and nickel. 6-10



### The gas path cleaners used by the Navy include petroleum distillates (aromatic and aliphatic hydrocarbons), assorted glycols, detergents, soaps, and water. 6,7 

### The composition of one such cleaner used by the Navy can be found in its material safety data sheet (MSDS). 6 

### According to the MSDS sheet, the cleaner can contain the aromatic hydrocarbon naphthalene at concentrations of up to 3.9%. Other petroleum distillate hydrocarbon constituents that could be present include aliphatic volatile organic compounds and other semivolatile compounds that are priority pollutants. The priority pollutants that are potential constituents of gas turbine water wash are cadmium, copper, nickel, and naphthalene. None of the constituents is a bioaccumulator.

3.4 Concentrations
The addition of gas path cleaner containing 3.9% naphthalene to the wash water at a 2% gas path cleaner concentration yields an estimated water wash naphthalene concentration of 800

### Gas Turbine Water Wash 5 milligrams per liter (mg/L). The following shows this calculation.

Because naphthalene is a se mivolatile organic compound that is not expected to volatilize while the water wash is sprayed into the turbine, the maximum water wash effluent naphthalene concentration is also estimated at 800 mg/L. Other constituents are variable and were not estimated.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
The water wash volume estimate for a Navy ship propulsion turbine cleaning operation and naphthalene concentration estimate of 800 mg/L were used to estimate the maximum annual mass loading. The estimate is based on the assumption that one turbine cleaning for each vessel is performed each day within 12 n.m.

The mass loading of O&G that can be introduced into the water wash effluent from within the gas turbine depends on (a) the amount of residue present; and (b) the degree to which the water wash spray removes the residue as it passes through the turbine.

4.2 Environmental Concentrations

Naphthalene Concentration (mg/L) = (% of cleaner in water)(% of naphthalene in cleaner)(density of naphthalene) where, % of cleaner in water = 2 % of naphthalene in cleaner = 3.9 density of naphthalene = (1.0253 g/cm 3 

### )(1000 mg/g)(1000 cm 3 

### /L) = 1.025 * 10 6 

### mg/L
Naphthalene Concentration = (0.02)(0.039)(1.025 * 10 6 

### ) = 800 mg/L

Mass Loading of Naphthalene (lbs/yr) = (naphthalene conc.)(discharge vol.)(365 days/yr)(# vessels) (3.7854 L/gal) (2.2 lb/kg) (10 -6 

### kg/mg)
(800 mg/L)(244 gal/day)(365 days/yr)(127)(3.7854 L/gal)(2.2 lb/kg)(10 -6 

### kg/mg) = 75,400 lbs/yr

### Gas Turbine Water Wash 6 Table 2 shows that the estimated naphthalene concentration exceeds the most stringent state water quality criteria (WQC) for naphthalene. Concentrations of oil and grease are expected to exceed WQC because the source of this discharge (gas turbine cleaning) is designed to dissolve fuel, lubricant, and other hydrocarbon deposits.

4.3 Potential for Introducing Non-Indigenous Species
There is no potential of introduction, transp ort, or release of non-indigenous species between different geographical areas, because the water wash system does not use seawater and therefore does not involve the discharge of seawater originating in another geographical region.

5.0 CONCLUSIONS
If discharged, gas turbine water wash has the potential to cause an adverse environmental effect within 12 n.m. because:

1) Estimated concentrations of naphthalene exceed and the most stringent state WQC and the mass loading of this priority pollutant would be significant; and

2) Concentrations of oil and grease are expected to be significant because the source of this discharge (gas turbine cleaning) is designed to dissolve fuel, lubricants and other deposits.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from the following sources was obtained to develop this NOD report. Table 3 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes. June, 20, 1997.

2. Un iform Maintenance Procedure Card (MPC), WAGB 400 Main Gas Turbine, MPC MC-062, Amendment 3.

3. Uniform Maintenance Procedure Card (MPC), WHEC 378 Main Gas Turbine, MPC MC-017, Amendment 0.

4. Uniform Maintenance Procedure Card (MPC), WHEC 378 Emergency Generator, MPC A-W-001, Amendment 0.

5. Maintenance Requirement Card (MRC), OPNAV 4790 (Rev. 2-82).

### Gas Turbine Water Wash 7 6. Gas Path Cleaner Material Safety Data Sheet, supplied by M. Galecki of DDG 51 Flight Upgrade Office via facsimile to Malcolm Pirnie (C. Geiling) on June 12, 1997.

7. Military Specification MIL-C-85704, “Cleaning Compound, Turbine Engine Gas Path”.

8 Military Specification MIL-F-16884, “Fuel, Naval Distillate”.

9. Military Specification MIL-F-5624, “Turbine Fuel, Aviation, Grades JP-4, JP-5, and JP10. Military Specification MIL-L-23699, “Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, NATO Code Number 0-156”.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by

### Gas Turbine Water Wash 8 The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Gas Turbine Water Wash 9 Table 1. Vessels With Gas Turbine Systems

Branch Class No. Vessel Type Comment Navy AOE 6 3 Fast Combat Support Ship Dedicated collection system

CG 47 27 Guided Missile Cruiser Dedicated collection system DD 963 31 Destroyer Dedicated collection system DDG 51 18 Guided Missile Destroyer Dedicated collection system DDG 993 4 Guided Missile Destroyer Dedicated collection system FFG 7 43 Guided Missile Frigate Dedicated collection system MCM 1 14 Mine Countermeasure Vessel Unknown configuration MSC T-AKR 310 1 Fast Sealift Ship Dedicated collection system USCG WAGB 399 2 Icebreaker Discharged to bilge

WHEC 378 12 High Endurance Cutter Discharged to bilge No. = number of vessels in class

Table 2. Comparison of Gas Turbine Water Wash Estimated Concentration and Water Quality Criteria ( μ g/L)

Constituent Maximum Estimated

Concentration Federal Acute WQC Most Stringent State

Acute WQC Naphthalene 800,000 None 780 (HI)
Notes: Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

HI = Hawaii



### Table 3. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation Equipment Literature X

2.2 Releases to the Environment OPNAVINST 5090.1B X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate Standard Operating Procedures X X

3.3 Constituents MSDS X X 3.4 Concentrations MSDS X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Graywater 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Graywater

### Graywater 2 2.0 DISCH ARGE DESCRIPTION
This section describes the graywater discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Graywater is defined in section 312(a) of the Clean Water Act as wastewater from showers, baths and galleys. On vessels of the Armed Forces, drainage from laundry, interior deck drains, lavatory sinks, water fountains, and miscellaneous shop sinks is often collected together with graywater. Therefore, this discharge covers graywater as well as mixtures of graywater with wastewater from these additional sources. 1 

### In this report, the term “graywater” will be used to describe all of these related discharges. Graywater is distinct from “blackwater”, the sewage generated by toilets and urinals.
While pierside, most classes of Navy vessels direct graywater to the vessel’s blackwater Collection, Holding, and Transfer (CHT) tanks, via segregated graywater plumbing drains. Some recently built ships (such as CVN 73 and CVN 74) do not have segregated blackwater/graywater drains. These ships collect the blackwater/graywater mixture while inside 3 nautical miles (n.m.). The blackwater and graywater mixture is then pumped to pierside connections for treatment ashore. A typical CHT system is shown in Figure 1. Most navy surface vessels without CHT systems have dedicated graywater tanks and pumps to collect and transfer this discharge to shore facilities. Some vessels lack the means to collect all the graywater that is generated while pierside. On these vessels a portion of the graywater plumbing drains run directly overboard. 1-4



### While operating away from the pier, most Navy surface vessels that collect graywater in CHT tanks divert graywater drains overboard to preserve holding capacity for blackwater in the tanks. Vessels equipped with separate graywater collection and transfer systems are not designed to hold graywater for extended periods of time and therefore drain or pump their graywater overboard while operating away from the pier.
Submarines collect their graywater in the ship’s sanitary tank while pierside and within 3 n.m. of land. Pierside, graywater mixed with blackwater is discharged to a shore facility for treatment; when outside 3 n.m., graywater is discharged directly overboard. Unlike surface vessels, holding capacity in the submarines’ sanitary tanks is generally sufficient to allow collection of graywater and blackwater up to 12 n.m. from shore. 1



### All Military Sealift Command (MSC) vessels are equipped with U.S. Coast Guard (USCG) certified Marine Sanitation Devices (MSDs) designed to treat sewage to EPA and USCG standards. On some MSC vessels, graywater can be collected and sent to the MSD for processing, or diverted overboard. On other MSC vessels, graywater is neither collected nor treated, but is discharged directly overboard.

### Graywater 3 Most USCG vessels are similar to Navy vessels since they can collect graywater while pierside. However, some USCG vessels currently cannot collect graywater, but continually discharge it overboard.

The majority of Army vessels collect graywater together with blackwater (sewage) ∗ 

### for treatment by a USCG certified MSD. The MSD effluent is either sent overboard, held in an effluent holding tank, or discharged to a shore facility.

2.2 Releases to the Environment
Contributions to graywater are described below. Three sources comprise the majority of graywater flow: Galley and scullery (18% in port, 22% at sea); laundry (22% in port, 33% at sea); and showers and sinks (60% in port and 45% at sea). 5 

### In addition, other minor sources include: filter cleaning discharges, deck drains, and medical/dental waste discharges. 1



### 2.2.1 Galley
Food preparation occurs in a vessel’s galley. Large Navy vessels have several galley compartments. In smaller vessels, the galley can be a shared space with related functions (e.g., the scullery), and have a single sink through which wastewater is discharged. Galley discharges specifically exclude food/garbage grinder wastes. Garbage grinders are required to be secured inside 3 n.m. 6



### Wastewater from the galley is generated through food preparation, disposal of cooking liquids, and cleaning of surfaces (bulkheads, appliances, sinks, and working surfaces). The generation and discharge are periodic, with the majority of the flow occurring during the hours preceding meal times. Galley graywater can contain highly biodegradable organics, oil and grease, and detergent residuals.

2.2.2 Scullery
The scullery can be separate from or integral with the galley and is used for the cleaning of dishes and cookware. Scullery wastewater also specifically excludes garbage grinder wastes, as garbage grinders are required to be secured inside 3 n.m

. 6 

### Scullery graywater can contain food residuals and detergents.

2.2.3 Showers and Lavatory Sinks
Lavatory sinks and showers drain to the vessel’s graywater system an d can contain soap residues, shampoos, shaving cream, and other products resulting from personal hygiene. Detergent residuals similar to those used in the galley can also be present.

2.2.4 Laundry

∗ The Army usually refers to bilgewater as “blackwater” and sewage as “sewage”.

### Graywater 4 Graywater derived from laundering crew uniforms, linens, and other articles of clothing can contain laundry detergents, bleaches, oils and greases, and traces of other constituents. Detergent residuals similar to those used in the galley, lavatory sinks, and showers can also be present.

2.2.5 Other Discharg es
Other minor discharges which are collected with graywater include filter cleaning discharges, deck drains, and medical/dental waste discharges. These discharges combined represent less than 1% of the total shipboard generated graywater. 5 

### Filter cleaning discharges consist of detergents and small amounts of oil from commercial dishwashing machines or sinks used to wash ship ventilation system air filters. Deck drains contribute small and intermittent flows which can include detergents used for floor cleaning and other general space cleaning. Small amounts of medical/dental wastes are collected with graywater on only a few Navy ships with extensive medical and dental facilities such as aircraft carriers (CV/CVNs) and amphibious assault ships (LHD/LHA/LPHs). This would include wastes from dental spit sinks and small blood samples less than 7.5 milliliters (mL). 7



### 2.3 Vessels Producing the Discharge
Vessels in the Navy, MSC, Army, Air Force, and USCG generate graywater. However, there are some vessels that do not produce a separate and distinct graywater discharge. These are the vessels not equipped with segregated graywater collection systems. Instead, they collect graywater together with blackwater for combined treatment with a MSD.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Discharges of graywater incidental to normal operations occur under three circumstances: (1) at the pier, for the ship classes lacking the means to collect graywater for shore treatment; (2) between 0 and 3 n.m. for most Navy and USCG vessels and for some MSC vessels; and (3) outside 3 n.m., where most graywater is discharged overboard.

3.2 Rate
The Navy uses a design figure of 30 gallons per capita-day (gal/cap/day) when designing graywater collections systems. 8

### Graywater 5 Table 1 presents estimates of discharge rates by vessel class for Navy, MSC, USCG, and Army ships. The following assumptions are inherent in the table:

• With the few exceptions noted in Section 2.1 and 2.3, vessels discharge graywater overboard at all times when not pierside. It is assumed, for purposes of calculation, that USCG, MSC, and Army vessels also discharge graywater overboard at all times when not pierside.

• A typical vessel is estimated to require about four hours to transit 12 n.m. from shore, with a per capita average rate of 1.25 gallons/hour (30 gal/cap/day). If this vessel undergoes 20 transits a year and has a crew size of 400, the annual graywater discharge rate while in transit would be:

(20 transits/year) (4 hours/transit) (1.25 gal/capita-hour) (400 personnel) = 40,000 gallons/year

Some vessels of the USCG and Army operate on a routine basis within 12 n.m. o f shore. Annual graywater discharge rate calculations for these vessels are based, in part, on the number of days each ship operates within 12 n.m. A vessel’s graywater discharge that results from operating within 12 n.m. is calculated by using the following general formula:

(personnel) (hours in operation/year) (1.25 gal/capita-hour) = gallons/year

USCG vessels that operate within 12 n.m. include: Mackinaw Class Icebreakers (approx. 150 days/year, 24 hours/day), Bay Class Icebreaking Tugs (approx. 150 days/year, 24 hours/day), and Balsam Class Seagoing Buoy Tenders (approx. 100 days/year, 24/hours/day). Army vessels that operate within 12 n.m. include: Logistic Support Vessels (approx. 30 days/year, 10 hours/day) and Landing Craft Utility (approx. 60 days/year, 10 hours/day). Due to the fact that the majority of Army vessels collect most of their graywater with blackwater, approximately only 10% of the graywater generated is discharged separately. 9



### As shown in Table 1, the total estimated am ount of graywater discharged overboard annually inside 12 n.m. is 39 million gallons. Of that volume, 15.3 million gallons are discharged pierside.

3.3 Constituents
In graywater, soaps, shampoos, detergents, and cleaners contribute organics as well as inorganic compounds such as nitrogen and phosphorous. Food waste will contribute oxygen demand (as measured by Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD)), nutrients, and oil and grease. Metals, pesticides, and organics from adhesives, sealants, lubricants, and cleaners can also be present in graywater. The constituents that have been measured in previous graywater studies are shown in Tables 2 and 3. The priority pollutants

### Graywater 6 cadmium, chromium, copper, lead, nickel, silver, and zinc were identified. Mercury, a bioaccumulator, was also identified. It is possible that certain parameters not tested for, and thus not listed in Tables 2 and 3, could also be present in graywater.

3.4 Concentrations
Table 2 shows the average values m easured for classical water quality parameters in various shipboard streams that contribute to graywater based on samples collected from three classes of vessels. Data are shown for the following graywater discharge components: wash basins and showers, food preparation, laundry, and dishwasher and deep sink. The ranges of the average measured values are: pH (6.74 - 10), total suspended solids (TSS)(94 - 4,695 milligrams per liter (mg/L)), total dissolved solids (TDS)(225 - 8,064 mg/L), BOD (144 - 2618 mg/L), COD (304 - 7,839 mg/L), total organic carbon (TOC)(59 - 1,133 mg/L), oil and grease (5 - 1,210 mg/L), methylene blue active substances (MBAS) (0.1 - 4.1 mg/L), ammonia nitrogen (0.17 - 669 mg/L), phosphate (1.03 - 28.2 mg/L), and coliform bacteria (178 - >2,000,000 per 100 mL). Flow-weighted average concentrations of these constituents are calculated in Table 2, based upon the data presented therein and the relative contribution of the three major sources of graywater.

Table 3 shows the mean concen trations of metals in various graywater components based on samples collected from three classes of vessels. Data are shown for the following graywater components: potable water sink, galley drains, sink, and scullery. The ranges of the average measured values are: silver (.007 - 0.012 mg/L), cadmium (0.004 - 0.017 mg/L), chromium (0.002 - 0.03 mg/L), copper (0.25 - 3.4 mg/L), lead (0.042 - 1.56 mg/L), mercury (.0002 - .0095 mg/L), nickel (0.025 - 0.113 mg/L), and zinc (0.19 - 2.36 mg/L). Flow-weighted average concentrations of these metals are calculated in Table 3, based upon the data presented therein and the relative contribution of graywater sources involved.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
Total flow, and therefore mass loadings, are influenced by the number of personnel aboard, time spent in transit, and time spent operating within 12 n.m. Total loadings can be estimated by multiplying concentration data by the total annual flow of graywater. Based on typical constituent concentrations and the estimated total flow calculated in Table 1, annual loadings of constituents are presented in Table 4.

4.2 Environmental Concentrations

### Graywater 7 Screening for constituents was accomplished by comparing measured levels of constituents to the lowest applicable water quality criteria. For graywater, the only constituents for which both data and water quality criteria are available are metals. Parameters such as BOD and nutrients are at levels that would be expected to cause localized adverse environmental effects.

As shown in Table 5, conc entrations of the priority pollutants copper, lead, nickel, silver, and zinc (measured as total metals), in one or more graywater components, exceed the most stringent water quality criteria. The bioaccumulator, mercury, exceeds the most stringent water quality criteria. Ammonia also exceeds the most stringent water quality criteria.

4.3 Potential for Introducing Non-Indigenous Species
Graywater originates from potable water rather than seawater. Therefore, the potential for introduction of non-indigenous species is not significant.

5.0 CONCLUSIONS
Graywater has the potential to cause adverse environmental effects because measured concentrations and estimated loadings of nutrients and oxygen-demanding substances are significant.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information and assumptions were used to estimate the rate of discharge. Based on this estimate and on the reported concentrations of constituents, the mass loadings to the environment resulting from this discharge were then estimated. Table 6 shows the source of the data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes - Graywater Discharge. 29 July 1996.

2. Aivalotis, Joyce, USCG. Personal Communication: USCG Photo Labs/Film Processing and X-ray Capabilities, 14 April 1997, David Eaton, M. Rosenblatt & Son, Inc.

3. Aivalotis, Joyce, USCG. Personal Communication: USCG Ship Description for Medical/Dental Waste Discharge, 14 April 1997, David Eaton, M. Rosenblatt & Son, Inc.

4. Cassidy, Brian. “Zero Discharge Study.” February 1996.

### Graywater 8 5. Whelan, Mary. “Graywater Characterization.” TM-28-89-01. March 1989.

6. Naval Ship’s Technical Manual (NSTM), Chapter 593, Pollution Control (Revision 3), page 2-2. 1 September 1991.

7. UNDS Equipment Expert Meeting Minutes - Medical/Dental Waste Discharges. 15 October 1996.

8. NAVSEA Design Practices and Criteria Manual for Surface Ship Freshwater Systems, Chapter 532. NAVSEA T9500-AA-PRO-120. October 1987.

9. SSG Huckabee, U.S. Army 7th Transportation Group, Fort Eustis. Personal Communication: Information on Army Vessels’ Graywater Discharge, 16 March 1998, Russell Fisher, Booz, Allen & Hamilton.

10. UNDS Ship Database, August 1, 1997.

11. Pentagon Ship Movement Data for Years 1991 - 1995, Dated March 4, 1997.

12. Talts, A. and D. R. Decker. Naval Ship Research and Development Center. “Nonoily Aqueous Waste Streams on the USS Sierra (AD18), Volume 1.” Bethesda, Maryland. Report 4182, April 1974.

13. Naval Ship Research and Development Center. “Nonoily Aqueous Waste Streams on USS Seattle (AOE 3), Volume I.” Bethesda, Maryland. Report 4192, June 1974.

14. Van Hees, W., D. R. Decker, and A. Talts. Naval Ship Research and Development Center. “Nonoily Aqueous Waste Streams on USS O’Hare (DD 889), Volume I.” Bethesda, Maryland. Report 4193, June 1974.

15. Attachment to Letter, Commander, Carderock Division, Naval Surface Warfare Center, Philadelphia, PA., 9593 Ser 6222/291, December 6, 1993, “Investigation of Metals From Industrial Processes, Intake Waters & Pipe Corrosion Onboard U.S. Navy Vessels at Norfolk Naval Base, Norfolk, VA.,” November 22 1993.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.

### Graywater 9 USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Graywater 10 Table 1. Ships of the Navy, MSC, USCG, and Army; Annual Graywater Discharge

Class Description Vessels 10 Crew Size Transits per Year 11 Estimated Total Time in Transit (hr) Graywater Discharge, in Transit (gal/yr) Vessels

Discharging Overboard at Pier Days in

Port, per year 11 Graywater Discharged Pierside (gal/yr) Total Graywater

Generation, 0 to 12 n.m. (gal/year) Total

Discharge, 0 to 12 n.m. (gal/yr) Navy Ships CG 47 Ticonderoga Class Cruiser 27 409 24 96 1,325,160 1,325,160 1,325,160 CGN 36 California Class Guided Missile Cruiser 2 603 22 88 132,660 132,660 132,660 CV 62 Forrestal Class Aircraft Carrier 1 5,624 6 24 168,720 168,720 168,720 CVN 65 Enterprise Class Aircraft Carrier 1 5,815 12 48 348,900 348,900 348,900 CV 63 Kitty Hawk Class Aircraft Carrier 3 5,624 14 56 1,181,040 1,181,040 1,181,040 CVN 68 Nimitz Class Aircraft Carrier 7 6,286 14 56 3,080,140 3,080,140 3,080,140 CGN 40 Virginia Class Guided Missile Cruiser 1 600 22 88 66,000 66,000 66,000 DDG 993 Kidd Class Guided Missile Destroyers 4 386 24 96 185,280 185,280 185,280 DDG 51 Arleigh Burke Class Guided Missile Destroyers 18 303 22 88 599,940 599,940 599,940 DD 963 Spruance Class Destroyers 31 396 24 96 1,473,120 4 175 1,663,200 3,136,320 3,136,320 FFG 7 Oliver Hazard Perry Guided Missile Frigates 43 220 26 104 1,229,800 1,229,800 1,229,800 LCC 19 Blue Ridge Class Amphibious Command Ships 2 1,516 16 64 242,560 242,560 242,560 LHD 1 Wasp Class Amphibious Transport Docks 4 3,151 26 104 1,638,520 1,638,520 1,638,520 LHA 1 Tarawa Class Amphibious Assault Ships 5 2,292 18 72 1,031,400 4 173 9,516,384 10,547,784 10,547,784 MCS 12 Iwo Jima Class Assault Ships 2 1,746 18 72 314,280 314,280 314,280 LPD 4 Austin Class Amphibious Transport Docks 3 1,487 22 88 490,710 490,710 490,710 LSD 41 Whidbey Island Class Dock Landing Ships 8 852 26 104 886,080 886,080 886,080 LSD 36 Anchorage Class Dock Landing Ships 5 794 26 104 516,100 516,100 516,100 MCM 1 Mine Countermeasures Ship Avenger Class 14 72 56 224 282,240 282,240 282,240 MHC 51 Mine Countermeasures Ship Osprey Class 12 50 50 200 150,000 150,000 150,000 PC 1 Cyclone Class Coastal Defense Ships 13 4 36 144 9,360 9,360 9,360 SSN 640 Benjamin Franklin Class Attack Submarines 2 120 16 64 0 19,200 0 SSN 671 Narwhal Class Attack Submarine 1 129 16 64 0 10,320 0 SSN 688 Los Angeles Class Attack Submarines 56 120 16 64 0 537,600 0 SSN 637 Sturgeon Class Attack Submarines 13 107 16 64 0 111,280 0 SSBN 726 Ohio-Class Ballistic Missile Submarines 17 136 16 64 0 184,960 0 Navy Auxiliary Ships AE 28 Kilauea Class Ammunition Ships 8 383 8 32 122,560 26 477,984 600,544 600,544 AO 177 Cimarron Class Oilers 12 135 20 80 162,000 188 1,827,360 1,989,360 1,989,360 AOE 6 Supply Class Fast Combat Support Ships 3 667 12 48 120,060 120,060 120,060 AOE 1 Sacramento Class Fast Combat Support Ship 4 601 22 88 264,440 264,440 264,440 ARS 50 Safeguard Class Savage Ships 4 90 44 176 79,200 79,200 79,200 AS 36 LY Spear and Emory S Land Class Submarine Tenders 3 604 10 40 90,600 90,600 90,600 AS 33 Simon Lake Class Submarine Tenders 1 915 12 48 54,900 54,900 54,900

Military Sealift Command T-AE Kilauea Class Ammunition Ships 8 187 40 160 299,200 45 403,920 703,120 703,120 T-AFS Mars Class Combat Stores Ships 5 135 40 160 135,000 135,000 135,000 T-AFS Sirius Class Combat Stores Ships 3 165 40 160 99,000 99,000 99,000

### Graywater 11 T-ATF Powhatan Class Fleet Ocean Tugs 7 23 40 160 32,200 32,200 32,200 T-AO Henry J Kaiser Class Oilers 12 137 40 160 328,800 45 443,880 772,680 772,680 T-AGM Haskell Class Missile Instrumentation Ship 1 124 40 160 24,800 24,800 24,800 T-AGM Compass Island Class Missile Instrumentation Ship 1 143 40 160 28,600 28,600 28,600 T-AH Mercy Class Hospital Ships 2 1,275 4 16 51,000 51,000 51,000 T-ARC Zeus Class Cable Repairing Ship 1 126 40 160 25,200 25,200 25,200 T-AKR Selandia Class Fast Sealift Ships 3 90 40 160 54,000 54,000 54,000 T-AKR Bob Hope Class Fast Sealift Ships 8 90 40 160 144,000 144,000 144,000 T-AGOS Stalwart Class Ocean Surveillance Ship 4 33 40 160 26,400 26,400 26,400 T-AGOS Victorious Class Ocean Surveillance Ship 4 34 40 160 27,200 27,200 27,200 T-AG Navigation Research Ship 2 204 40 160 81,600 81,600 81,600 T-AGS Silas Bent Class Surveying Ships 2 65 40 160 26,000 26,000 26,000 T-AGS Waters Class Surveying Ships 1 95 40 160 19,000 19,000 19,000 T-AGS McDonnel Class Surveying Ships 2 33 40 160 13,200 13,200 13,200 T-AGS Pathfinder Class Surveying Ships 4 52 40 160 41,600 41,600 41,600 T-AGOR Gyre Class Oceanographic Research Ships 1 32 40 160 6,400 6,400 6,400 T-AGOR Thompson Class Oceanographic Research Ships 2 59 40 160 23,600 23,600 23,600 U.S. Coast Guard WHEC Hamilton and Hero Class High Endurance Cutters 12 176 26 104 274,560 274,560 274,560 WMEC Storis Class Medium Endurance Cutters 1 92 18 72 8,280 167 92,184 100,464 100,464 WMEC Diver Class Medium Endurance Cutters 1 136 18 72 12,240 98 79,968 92,208 92,208 WMEC Famous Class Medium Endurance Cutters 13 98 18 72 114,660 114,660 114,660 WMEC Reliance Class Medium Endurance Cutters 16 71 18 72 102,240 102,240 102,240 WAGB Mackinaw Class Icebreakers* (150 d, 24 hr/d) 1 85 (3600) (382,500) 150 76,500 459,000 459,000 WAGB Polar Class Icebreakers 2 140 8 32 11,200 11,200 11,200 WTGB Bay Class Icebreaking Tugs* (150 d, 24 hr/d) 9 17 (3600) (688,500) 8 7,344 695,844 695,844 WPB 110 110' Class Patrol Craft 49 10 14 56 34,300 140 411,600 445,900 445,900 WLB Juniper Class Seagoing Buoy Tenders 1 40 36 144 7,200 7,200 7,200 WLB Balsam Class Seagoing Buoy Tenders* (100 d, 24 hr/d) 24 53 (2400) (3,816,000) 3,816,000 3,816,000 WIX Eagle Class Sail Training Cutter 1 245 12 48 14,700 188 276,360 291,060 291,060 U.S. Army ** LSV Logistic Support Vessel* (30 d, 10 hr/d) 6 32 40 160 (300) 3,840 (+7,200) 110,400 11,040

LCU Landing Craft Utility* (60 d, 10 hr/d) 48 13 6 24 (600) 1,872 (+46,800) 486,720 48,672

Total Volume (Gallons): 18,311,950 15,276,684 39,936,114 38,535,346 Notes: Values in italics are estimated. At-pier discharge presented only for classes without or with inadequate capability to capture graywater for shore treatment At-pier discharge based on 20% occupancy by crew. * Vessel classes that operate within 12 n.m. of U.S. shore on a routine basis (days of operation within 12 n.m. per year and hours per day) ** The majority of Army vessels collect graywater with blackwater. Approximately 10% of the graywater generated is discharged separately. 9

### Graywater 12 Table 2. Classicals Concentration in Graywater (mg/L) 12-14 

### (Arithmetic Average)

Parameter DD 889 Wash

Basins and Showers 14 DD 889

Comb. Food Prep 14 DD 889

Laundry 14 AOE 3 Wash

Basins and Showers 13 AOE 3

Dishwasher and Deep Sink 13 AOE 3

Laundry 13 AD 18 Wash

Basins and Showers 12 Galley

Weighted Average Sink and Shower

Weighted Average Laundry

Weighted Average Flow

Weighted Average** No. Samples 114 134 28 7 60 20 91 pH 7.3 6.88 9.99 7.12 6.74 8.33 6.86
TSS 404 4,695 221 94 194 176 119 3303 271.4 202.3 802
TDS 1,445 8,064 1,006 237 752 583 225 5803 881.4 829.8 1756
BOD 230 2,618 419 226 503 190 144 1964 193 323.6 540
COD 348 7,839 721 509 2,380 469 304 6150 334.4 616 1443
TOC 70 1,133 165 82 251 59

- 860 70.7 120.8 224 Oil & grease 12.06 1,210 8.11 20.65 82.46 4.56

- 861.3 12.6 6.6 164
MBAS * 0.96 0.09 0.84 0.12 0.14 4.12

- 0.11 0.9 2.2 1.1
N-ammonia 15.4 669 80.48 0.58 0.64 0.17

- 462.3 14.5 47 102.3
N-nitrate 2.73 10.85 1.16 0.89 2.08 0.29

- 8.1 2.6 0.8 3.2
N-nitrite

- - - 0.09 0.11

- - - - - - N-Kjeldahl 187 99.84 164 4.31 4.84 0.43

- 70.5 176.4 95.8 140 P (phosphate) 1.36 20.78 1.3 1.03 6.34 28.25

- 16.3 1.3 12.5 6.5
Total coliforms (microorg/100mL) 707,000 257,000 178 8,300 2,360,000 3,890 60,600 907,412 406,466 1725 407,593

Fecal coliforms (microorg/100mL) 178,000 103,000

- 200 1,250,000 21,000 7,900 457,742 99,115

- 141,862

(-) no data reported for this parameter (*) MBAS - Methylene Blue Active Substances (**) Weighted averages for galley, showers/sinks, and laundry based on data presented herein. Flow-weighted average for graywater based on in-port contribution of major graywater sources (galley 18%, showers/sinks 60%, and laundry 22% of total) 5

### Graywater 13 Table 3. Metals Concentrations in Graywater (mg/L) 15 

### (Mean Values)

Metal (total) CVN 73 Potable

Water Sink 15 CVN 73 Galley

Drains 15 AS 39

Sink 15 AD 38 Scullery 15 Galley Weighted Average Sink & Shower

Weighted Average Flow-Weighted

Average

No. Samples 12 13 8 11 Cadmium 0.004 0.017 0.005 0.004 0.011 0.004 0.006 Chromium* 0.002 0.03 0.007 0.01 0.01 0.004 0.005 Copper 0.754 3.404 0.443 0.250 1.96 0.630 0.936 Lead 0.042 1.560 0.047 0.182 0.928 0.044 0.247 Mercury 0.0003 0.0004 0.0002 0.0095 0.0046 0.0003 .0013 Nickel 0.037 0.113 0.025 0.031 0.075 0.032 0.042 Silver 0.007 0.012 0.008 0.011 0.012 0.007 0.008 Zinc 0.194 2.363 0.305 0.216 1.38 0.238 0.501
Note: (*) Sample readings below the lower detection limit for chromium were treated as zero. For all the other metals listed above, when samples were measured at < LDL, the LDL was used in calculating the average.
(**) Weighted averages for galley and showers/sinks based on data presented herein. Flow-weighted average for graywater based on in-port contribution of graywater sources (galley 23%, showers/sinks 77% of total)

### Graywater 14 Table 4. Mass Loadings of Constituents *

Parameter Flow-Weighted Average

Concentration (mg/L) Loading (lb/yr.)

Copper 0.936 304 Lead 0.247 80.3 Mercury 0.0013 .423 Nickel 0.042 13.7 Silver 0.008 2.60 Zinc 0.501 163 TSS 802 260,900 BOD 540 175,600 COD 1443 469,400 Oil and Grease 164 53,340 MBAS 1.1 358 N-Ammonia 102 33,180 N-NO 3 

### 3.2 1,040 N- Kjeldahl 140 45,540 P- Phosphate 6.5 2110 * Based on flow-weighted average constituent concentrations. See Tables 2 and 3.

### Graywater 15 Table 5. Comparison of Graywater Concentration Data Versus Acute Water Quality Criteria ( μ g/L )

Parameter Concentration* Federal Acute WQC M ost S tringent S tate Acute

WQC ( State ) Ammonia 102 None 6 (HI) A 

### Copper 3,404 2.4 2.4 (CT, MS) Lead 1,559 210 5.6 (FL, GA) Mercury ** 

### 9.5 1.8 0.025 (FL, GA) Nickel 113 74 8.3 (FL, GA) Silver 12 1.9 1.2 (WA) Zinc 2,363 90 84.6 (WA)
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria. A - Nutrient criteria are not specified as acute or chronic values.

CT = Connecticut FL = Florida GA = Georgia MS = Mississippi WA = Washington (*) Highest concentration for an y individual component from Table 3. (**) Bioaccumulator



### Table 6. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate Data call responses X

3.3 Constituents X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Graywater 16 Figure 1. A Typical Collection, Holding, and Transfer System

### Hull Coating Leachate 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Hull Coating Leachate

### Hull Coating Leachate 2 2.0 DISCHARGE DESCRIPTION
This section describes the hull coating leachate discharge and includes information on the coating systems used and how they function (Section 2.1), a general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 System Description and Operation
Underwater hull coating systems typically include a base anticorrosive (AC) coating covered by an antifouling (AF) coating. The function of the AC coat, in conjunction with cathodic protection (described in the Cathodic Protection NOD report), is to prevent hull corrosion. The AC coat also provides bonding between the hull and the AF topcoats. Since the AC coating is not exposed directly to the seawater, unless the AF coating has been damaged, the AC coatings do not leach. The AF topcoat inhibits the development of marine growth on the hull. Marine fouling is undesirable because it increases drag and fuel consumption, while decreasing vessel speed. 1



### 2.1.1 Types of AF Topcoats
Several different types of AF topcoats, qualified to MIL-PRF-24647 or MIL-P-15931, are used on the hulls of the Armed Forces vessels. 2
, 3 

### Within MIL-PRF-24647, they are categorized by:

• action;

• type of substrate;

• volatile organic compound (VOC) content of the coating; and

• service life requirement and color.

Action - The coating may work through ablative (Type I) or nonablative (Type II) action. An ablative coating thins as it erodes or dissolves. Through this action, a fresh layer of antifouling agent (e.g., copper) is exposed, maintaining the antifouling properties of the paint. Type II nonablative AF coatings do not thin during service. Some of these coatings function by leaching metals that prevent marine fouling. 1



### Type of Substrate - Most hulls of major vessels in the Armed Forces are steel. Hulls of smaller vessels and some specialty vessels (e.g., minesweepers and minehunters) are often constructed of alternate materials such as aluminum, fiberglass sheathing, glass reinforced plastic (GRP), rubber, or wood. The coating system applied will vary with the hull material. For instance, steel, fiberglass, GRP, and wood hulls are typically coated with copper-based coatings, and aluminum hulls with tributyltin (TBT) or biocide-free silicone-based coatings. 1
, 4 

### Rubber craft are left unpainted and, therefore, do not contribute to this discharge.

### Hull Coating Leachate 3 VOC Content - Coatings are classified into four grades based on their maximum VOC content. The upper limits for each grade are 3.4 pounds per gallon (lbs/gal), 2.8 lbs/gal, 2.3 lbs/gal, and zero lbs/gal. 2



### Service Life Requirement and Color - Coatings are also classified based on the desired service life of the coating system and their color. A vessel’s coating system may have a five-, seven-, or ten-year service life. Vessels also may use either red, black, or gray coatings (and white on some smaller craft). Therefore, there are a number of different coating combinations, based on service life and color. 1



### 2.2 Releases to the Environment
AF topcoats control biological growth by ablating and/or releasing antifouling agents into the surrounding water. This release is gradual and continuous. The release rate depends on the type of paint, water temperature, vessel speed, frequency of vessel movement in and out of port, and coating age. The type of material released is dependent on the type of topcoat employed. Most hulls use copper-based coatings; therefore, copper and zinc (another biocide commonly found in antifouling paints) are the most common releases. Those aluminum-hulled vessels with TBT-containing coatings will release TBT and small amounts of zinc, and may release copper, depending on the TBT coating formulation. 1



### 2.3 Vessels Producing the Discharge
Most vessels of the Armed Forces use AC paints or AC/AF coating s ystems. Selected boats and craft may not be coated with AF paint if they spend most of their time out of the water. The Navy, Military Sealift Command (MSC) and United States Coast Guard (USCG) use paint systems qualified to MIL-PRF-24647. The Army uses paint systems with AF topcoats qualified to MIL-P-15931. Additional guidance for Navy vessels is contained in Naval Ships’ Technical Manual (NSTM) Chapter 631. 5
, 6 

### It should be noted that paint types and applications vary for each vessel, depending on where the vessels are docked and the port in which they are painted, which influences paint availability.

2.3.1 Copper-Based Coatings
Most Navy, MSC, USCG, and Army ships have steel hulls with copper-based AF coatings. The Navy ships that do not have steel hulls are the mine countermeasure vessels (MCM 1 and MHC 51 Classes), consisting of 26 ships. MCM 1 Class vessels have wood hulls sheathed with fiberglass and MHC 51 Class vessels have GRP hulls. 7 

### However, these vessels are still protected with AC coats and copper ablative AF paints similar to those applied to steel vessels. 1



### MSC vessels use two types of Navy-approved copper-based AF paints, ablative and nonablative. Approved MSC underwater hull coatings are listed in MSC Instruction 4750.2C. 8 

### The USCG utilizes Navy-approved hull coating systems qualified to MIL-PRF-24647, as listed in the USCG Coatings and Color Manual. 9 

### The Air Force uses copper ablative paints similar to

### Hull Coating Leachate 4 those used by the Navy. 10 

### AF topcoats used on Army watercraft are qualified to MIL-P-15931, as listed in Department of the Army Technical Bulletin TB 43-0144. 3



### 2.3.2 TBT-Based Coatings
The predominant use of TBT-based coatings in the Armed Forces has been on aluminumhulled vessels. Copper-based AF paints can accelerate the rate at which aluminum hulls corrode, especially if defects or damage to the AC coating are present. Currently, all Navy ships with aluminum hulls (i.e., hydrofoils) have been decommissioned. 1 

### However, the Navy does have approximately 280 small boats and craft with aluminum hulls. Approximately 10-20% of the aluminum-hulled small boats and craft in the Navy (28-56 vessels; e.g., special warfare patrol craft) could still have TBT-based hull coatings. 11 

### The USCG estimates that 50 aluminum-hulled small boats and craft are coated with AF paint containing TBT. 12 

### The MSC has no vessels with aluminum hulls. 13 

### The Air Force has six large vessels with aluminum hulls, the MR Class missile retrievers. These vessels are coated with TBT-free, copper-based coatings. 7
, 10 

### The Air Force also has approximately 50 small craft that may have TBT-containing coatings. The Army has approximately 11 small boats and craft that may have TBT coatings. 13 

### The numbers of vessels from the respective Armed Forces branches estimated to have TBT coatings are listed below.

• Navy - 56

• USCG - 50

• MSC - 0

• Air Force - 50

• Army - 11

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
This discharge occurs within harbors, rivers, and coastal waters from every surface vessel and submarine, as well as most boats and craft. This discharge is continuous and will occur any time a painted vessel is waterborne.

3.2 Rate
This discharge is not a flow; rather, it is the release of AF agents from hull coatings into the surrounding water. This rate of release, which is the combined effect of ablation and leaching, has been the subject of previous Navy studies. 14 

### In these studies, painted panels were

### Hull Coating Leachate 5 submerged in San Diego Bay and copper and zinc release rates were calculated for two of the most frequently used ablative copper AF paint systems.
Dynamic exposure tests included intervals of simulated vessel movement (cruising) at 17 knots followed by periods of no movement, in order to simulate actual vessel operations. The calculated long-term average release rates (from both test coatings) for simulated vessel operation exposures were 17.0 micrograms per square centimeter-day (( μ g/cm 2 

### )/day) for copper and 6.7 ( μ g/cm 2 

### )/day for zinc. Release rates were highest at the initial stages of the exposures, when the coatings were new. 14



### Long-term average release rates for panels remaining in a static position (no simulated movement) for the entire test were 8.9 ( μ g/cm 2 

### )/day for copper and 3.6 ( μ g/cm 2 

### )/day for zinc. 14 

### It is assumed that the static tests underestimate the actual average release rate from vessels because they do not account for vessel movement and the resulting ablation effects.
A comparison of the above dynamic and static release rates shows that dynamic conditions resulted in increased release of copper and zinc. The higher release rates are presumably caused by continuous re-exposure of fresh copper and zinc. The dynamic tests may, however, overestimate actual conditions for some vessels, as the dynamic intervals used in the test may have been more aggressive than in actual practice.

In-situ relea se rates of TBT from vessels in Pearl Harbor were collected by the Navy in 1987 and 1988. 15 

### These studies reported an average steady-state TBT release rate of 0.38 ( μ g/cm 2 

### )/day.

3.3 Constituents
The primary antifouling agent in most AF topcoats is copper. Because copper is toxic to marine organisms, it inhibits their accumulation and growth on the hull. Other than copper compounds, the constituents that can be released from approved, underwater hull paint systems include acrylate (in ablative coatings), vinyls (in non-ablative coatings), rosin, zinc compounds, and anticorrosive compounds. 16
, 17 

### The discharge from aluminum-hulled vessels may also contain TBT. Of the known constituents in AF coatings; copper, zinc, TBT, and ethyl benzene are priority pollutants, and there are no known bioaccumulators.

3.4 Concentrations
Most copper-based AF coatings contain 40 to 50 weight percent (wt%) cuprous oxide. 16

### Some ablative AF paints also contain as much as 20 wt% zinc, which may act as a mild cobiocide. 16 

### Concentrations within TBT-based AF coatings range from less than 5 wt% to 25 wt% for TBT compounds and 25-50 wt% for copper. Some TBT-based coating formulations contain 1-10 wt% ethyl benzene. 18



### 4.0 NATURE OF DISCHARGE ANALYSIS

### Hull Coating Leachate 6 Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings

4.1.1 Copper and Zinc Loadings
The mass loadings for copper and zinc were calculated for Navy, MSC, USCG, Army, and Air Force vessels based on the reported release rates. 14 

### Loading for a single vessel was calculated by the following equation:

The wetted surface area of the vessels were either taken directly from a naval manual or were estimated by the following formula presented in the same source: 19



### Calculations were performed for each vessel class. A sample calculation of the mass loading of copper from a destroyer is provided in Calculation Sheet 1 at the end of the report. From actual vessel movement data compiled for 1991 through 1995, the sum of the average number of days in port, the average number of transits, and time of operation within 12 n.m. was determined for each vessel class. 20 

### The number of vessels in each class are listed in conjunction with the total calculated loadings per vessel class in Table 1. A total annual copper loading of 216,657 lbs (98,257 kilograms (kg)) and a total annual zinc loading of 85,389 lbs (38,725 kg) were calculated. The mass loadings calculated represent the worst-case conditions.
The approach used overestimates the mass loading for the following reasons:

Copper Loading = (release rate)(surface area)(time)

where: release rate = dynamic release of copper and zinc (Section 3.2) surface area = wetted surface area of vessel time = number of days vessel is within 12 nautical miles (n.m.)

S = 1.7(L)(d) + (V/d)

where: S = wetted surface area (ft 2 ) L = length between perpendiculars (ft) d = molded mean draft at full displacement (ft) V = molded volume of displacement (for seawater, 35 ft 3 per ton displacement)

### Hull Coating Leachate 7 • Calculations were based on the dynamic release rate, and vessels are not in motion while pierside.

• All vessels were assumed to be deployed at ports within the jurisdiction of the United States, while many are actually deployed overseas.

• All vessels are assumed to be fully operational; that is, no reduction was made to account for the number of vessels which may be in dry dock during the year.

• All small workboats and utility craft were assumed to be in the water at all times, when they may actually be stored on land.

• Amphibious assault craft of both the Army and Navy, which are capable of being transported or otherwise held within larger amphibious ships, were assumed to be in the open water at all times.

4.1.2 TBT Loadings
Table 2 presents mass loadings of TBT from Navy, USCG, Army, and Air Force vessels, based on the study of TBT concentration measurements from five vessels in Pearl Harbor. 15 

### The average release rate measured during this study was 0.38 ( μ g/cm 2 

### )/day. The mass loading value was estimated to be 24 lbs/yr (11 kg/yr) based on the following assumptions:

• Small boats and craft were estimated to be within 12 n.m. at all times and to spend 10% of the year out of the water. This assumption leads to an overestimate of the mass loadings for TBT because many small boats and craft spend much more than 10% of their time out of the water.

• Twenty percent of the Navy’s aluminum-hulled small boats and craft were assumed to still have TBT-based AF coatings, although the actual number may be as low as 10%.

• All of the 50 Air Force and 11 Army small craft were assumed to be painted with TBT coatings.
Use of these assumptions also overestimates the potential TBT loading since the use of TBT coatings is being phased out, and the number of TBT coated craft in the Armed Forces is continually declining.

4.2 Environmental Concentrations
The estimated quantities of constituents released to the environment are shown in Tables 1 and 2. Using the mass loadings and a tidal prism model for analyzing mixing within specific harbors, the resulting concentration of constituents in the environment were estimated in the manner described below.

4.2.1 Copper and Zinc Concentrations
Table 3 lists the Federal and most stringent state water quality criteria for the constituents of the hull coating leachate discharge. Using the annual copper and zinc loadings and annual tidal excursion volumes, the average copper and zinc concentrations caused by these vessels were calculated for each port. The approach used to estimate concentrations uses a simplified dilution

### Hull Coating Leachate 8 model based on tidal flow in three major Armed Forces ports and hereafter referred to as the “tidal prism” approach. The tidal prism approach uses the mass of the constituent generated by vessels and mixes this mass with a volume of water. The mass is calculated by determining the number of vessels in a particular homeport, the wetted surface area of each vessel’s hull, and the number of hours each vessel spends in port (both pierside and in transit). Together, these factors are used to calculate an annual loading to the harbor. The water volume used is the sum of all outgoing tides over a year times the surface area of the harbor. The sum of outgoing tides is called the “annual tidal excursion.” This can be calculated by subtracting the annual mean low tide from the annual mean high tide and multiplying the difference by the number of days in the year. Annual tidal excursion data is readily available from the National Oceanographic and Atmospheric Agency (NOAA) and the 1996 data 21 

### was used for these calculations. The following is the equation used to estimate concentrations of copper and zinc contributed to harbors by hull coating leachate:

Concentration increase = Annual load / Annual tidal prism volume where: annual load = (kg/yr)/(10 9 

### μ g/kg) = ( μ g/yr) annual tidal prism volume = (m 3 

### /yr) (10 3 

### L/m 3 

### ) = (L/yr) Concentration increase = μ g/L

The three ports used for the tidal prism model are Mayport, FL, San Diego, CA, and PearlHarbor, HI. These ports were selected because they have minimal river inflow, small but welldefined harbor areas, and a high number of vessels of the Armed Forces. Each of these factors will tend to provide higher concentrations of copper and zinc, either due to less volume of water or higher numbers of potential sources. Other major ports, such as Norfolk (VA) and Bremerton (WA), were considered, but not included because of large river effects and very large harbor areas. The 1996 annual tidal volumes (annual tidal excursion times the harbor surface area) for the three ports are shown below:

• San Diego, CA, 3.78 x 10 10 

### m 3 

### per year;

• Mayport, FL, 6.7 x 10 8 

### m 3 

### per year; and

• Pearl Harbor, HI, 3.42 x 10 9 

### m 3 

### per year.
The tidal prism model assumes steady-state conditions, where copper and zinc are completely mixed with the harbor water and are removed solely by discharge from the port during ebb tides. The outgoing tidal volumes are assumed to be carried away by long-shore currents (i.e., those moving parallel to shore) and do not re-enter the harbor. The tidal prism model also does not assume removal or concentration by other factors such as river flow, precipitation, evaporation, or sediment exchange. By not accounting for removal or dilution due to river flow, precipitation, and sediment exchange, the results depict a higher water column concentration than expected. The effect of evaporation could be to increase concentration due to water loss, or the effect could be neutral since water loss by evaporation is replaced by (additional) water inflow from the sea. While the model assumes complete mixing, there will be areas in the harbors with higher concentrations, primarily near the source vessels, along with areas of lower concentration.

### Hull Coating Leachate 9 To estimate the annual load for the same three ports, the number and types of vessels in each of these locations were obtained. 22 

### The ratios of Navy vessels at each of these ports to the total number of vessels per respective ship class were multiplied by the copper and zinc mass loadings of Table 1 and summed. The estimated contribution of Armed Forces’ AF paint to the existing copper and zinc concentrations in each port is provided in Table 4. The actual annual load attributable to hull coating leachate for each of these ports should be smaller than estimated for two reasons. First, the calculated mass loadings are based upon dynamic release rates, yet the vessels in port are primarily static. Also, the mass loadings of copper and zinc were determined using the total amount of time that the vessels are within 12 n.m., not just in port. Therefore, the actual concentrations in port will be lower than stated.
The calculated copper concentration increases are shown in Table 5 and range from 0.19 μ g/L at San Diego to 3.0 μ g/L at Mayport, the latter of which exceeds Federal and state water quality criteria. Copper from AF paint adds to the ambient copper concentrations from other sources. In other words, these concentrations represent the ambient copper concentration if hull coating leachate were the only source of copper in each harbor. Ambient copper concentrations in San Diego Harbor have been reported to average near 3.7 μ g/L, with locally impacted areas near vessels at twice the average. 23



### As demonstrated by Table 5, the estimated copper contributions from hull coating releases are a significant contributor to total copper levels within the Navy ports analyzed. In addition, some of these ports are already near or above ambient water quality criteria levels for copper. Therefore, dilution of copper to levels below the water quality criteria cannot be expected. By contrast, the three ports analyzed were all well below the water quality criteria for zinc, and estimated zinc concentration increases were not large enough to cause the zinc levels in these ports to approach the zinc water quality criteria. 24



### 4.2.2 TBT Concentrations
As discussed in Section 2.3.2, only small boats and craft of the Armed Forces still use TBT-containing coatings. A tidal prism approach can also be used to estimate TBT concentrations, assuming that the TBT loading in each harbor is proportional to the copper loading, as might be the case if the locations of small boats and craft parallel that of larger vessels. As shown in Calculation Sheet 2, TBT is estimated to range from 0.02 nanograms per liter (ng/L) to 0.30 ng/L in the harbors analyzed. TBT does not have specific Federal water quality criteria at the present; however, criteria have been proposed. 25 

### Table 3 lists the proposed Federal and most stringent state water quality criteria for TBT.

4.3 Potential for Introducing Non-Indigenous Species
Although it is possible for non-indigenous species to be transported on vessel hulls, AF coatings reduce the amount of marine growth on vessel hulls. The discharge itself (released components of AF coatings) does not provide the opportunity for transport of non-indigenous species.

### Hull Coating Leachate 10 5.0 CONCLUSIONS
Hull coating leachate has the potential to cause an adverse environmental effect because estimated mass loadings of copper from hull coatings are significant and could cause environmental copper concentrations to exceed water quality criteria in some ports.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained, reviewed, and analyzed. Process information and assumptions were used to estimate the rates of discharge. Table 6 shows the sources of data used to develop this NOD report.

Specific References

1

. UNDS Equipment Expert Meeting Minutes - Hull Coating Leachate, 20 August 1996.

2

. Military Specification, MIL-PRF-24647B, Paint S ystem, Anticorrosive and Antifouling, Ship Hull, August 1994.

3

. Department of the Army Technical Bulletin, Painting of Watercraft, TB 43-0144, 5 October 1990.

4

. Material Safety Data Sheets for Courtaulds Coatings Inc. International Paint Intersleek  

### Tie Coat BXA 386/BXA 390/BXA 391 and Intersleek  

### Finish BXA 816/BXA 821/BXA 822, June 1992.

5

. Naval Ships’ Technical Manual (NSTM) Chapter 631, Vol. 3, Preservation of Ships in Service , Section 8, Shipboard Paint Application, 1 November 1992.

6

. Naval Se a Systems Command (NAVSEA), Advance Change Notice (ACN) No. 3/A, to Naval Ships’ Technical Manual Chapter 631, S9086-VD-STM-030, Preservation of Ships in Service . September 1996.

7

. Polmar, N. The Naval Institute Guide to the Ships and Aircraft of the U.S. Fleet
, Sixteenth Edition. Naval Institute Press, Annapolis, MD, 1997.

8

. Commander Military Sealift Command, COMSC Instruction 4750.2C, Preservation Instructions for MSC Ships , Appendix A, 3 November 1989.

9

. United States Coast Guard, Coatings and Color Manual , Commandants Instruction M10360.3A, August 1995.

10

. Department of the Air Force, HQUSAF/ILTV, Memo to M. Rosenblatt and Son, Inc., 21 August 1997.

### Hull Coating Leachate 11 11

. Holmes, B. S., Naval Sea Systems Command. Vessels with TBT Coatings based on conversations with Fleet representatives, June 1997, K. Thomas, M. Rosenblatt and Son, Inc.

12

. Aivalotis, J., USCG, TBT on USCG Ships, 28 May 1997, L. Panek, Versar, Inc.

13

. UNDS Ship Database, 1 August 1997.

14

. Marine Environmental Support Office, Naval Command, C ontrol & Ocean Surveillance Center, RDT&E Division (NRaD), UNDS Hull Coating Evaluation, 28 February 1997.

15

. Naval Command, Control & Ocean Surveillance Center (NRaD). “Butyltin Concentration Measurements in Pearl Harbor, Hawaii, April 1986 to January 1988, Pearl Harbor Case Study,” April 1989.

16

. Material Safety Data Sheets for the following products:

Product/Trade Name: BRA 640 Interviron, Red Antifouling Paint Manufacturer: Courtaulds Coatings

Product/Trade Name: 283S5772 ABC #3 - Red Ablat ive Antifouling Paint Product Number 406940 Manufacturer: Ameron Protective Coatings Group

Product/Trade Name: 283S5773 ABC #3 - Black Ablative Antifouling Paint Product Number 407150 Manufacturer: Ameron Protective Coatings Group

Product/Trade Name: Epoxy Adhesives 2216 B/A Gray, 2216 B/A Tan NS, and 2216 B/A Translucent Manufacturer: 3M Scotch-Weld TM 

### , March 1995

Product/Trade Name: Epoxy Adhesives Manufacturer: 3M Innovation, March 1996

17

. Qualified Products List (QP L-15931-14) of Products Qualified Under Military Specification MIL-P-15931, Paint, Antifouling, Vinyl (Formulas No. 121, 121A, 129, and 129A). January 1995.

18

. Material Safety Data Sheets for International Paint Intersmooth Hisol Plum BFA254, November 1996; and Devoe Coating Company ABC #2 Red Ablative Antifouling Coating, September 1995.

19

. Naval Ships’ Technical Manual (NSTM) Chapter 633, Section 4.3.1 and Table 633-5. Cathodic Protection . 1 August 1992.

### Hull Coating Leachate 12 20

. Pentagon Ship Movement Data for Years 1991 -1995, Dated 4 March 1997.

21

. National Oceanic and Atmospheric Administration, 1997.

22

. United States Navy, List of Homeports, Effective 30 April 1997.

23

. Valkirs, A.O., B.M. Davidson, L.L. Kear, R.L. Fransham, A.R. Zirino, and J.G. Grovhoug; Naval Command, Control and Ocean Surveillance Center, RDT&E Division. “Environmental Effects from In-Water Hull Cleaning of Ablative Copper Antifouling Coatings.” Tech. Doc. 2662. 1994.

24

. U.S. Environmental Protection Agency, Office of Wetlands, Oceans and Wa tersheds, Assessment and Watershed Protection Division, Retrieval from STORET Database, 1997.

25

. Proposed Water Quality Criteria, 62 Federal Register 42554, 7 August 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.

### Hull Coating Leachate 13 Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Naval Command, Control and Ocean Surveillance Center, RDT&E Division, San Diego, CA. “Dynamic and Static Exposure Tests and Evaluations of Alternative Copper-Based Antifouling Coatings.” September 1993.
Military Specification, MIL-PRF-15931, Paint, Antifouling, Vinyl, January 1995.
Qualified Products List (QPL-24647-3) of Products Qualified Under Military Specification MILPRF-24647, Paint System, Anticorrosive and Antifouling, Ship Hull. 2 April 1996.
Aivalotis, J., United States Coast Guard, USCG Ship Movement, 27 May 1997, L. Sesler, Versar, Inc.
UNDS Equipment Expert Round 2 Meeting Minutes - Hull Coating Leachate, 1997.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.Table 1. Navy, MSC, and USCG, Army, and Air Force Mass Loadings for Ships, and Small Boats and Craft

Ship Class Ship Class Description Quantity of Ships per Class Days in Port

per Year Number of

Transits per year (each is a transit in and out) T Days of

Operation within 12

n.m. Ship's Wetted

Surface Area (sq ft) *Copper

Loading per ship class (kg/yr) **Zinc

Loading per ship class (kg/yr) NAVY AC Area Command Cutter 2 305 0 60 539 6 2 AP Area Point System Search Craft 6 305 0 60 343 12 5 AR Aircraft Rescue 6 305 0 60 2,127 74 29 AT Armored Troop Carrier 21 305 0 60 362 44 17 BH Boom Handling 8 305 0 60 189 9 3 BT Bomb Target 4 305 0 60 94 2 1 BW Boston Whaler 4 305 0 60 94 2 1 CA Catamaran 1 305 0 60 207 1 0 CC Cabin Cruiser (Commercial) 4 305 0 60 411 9 4 CM Landing Craft, Mechanized 151 305 0 60 4,275 3,721 1,467 CRRC Combat Rubber Raiding Craft (USMC) 418 305 0 60 57 137 54 CT Craft of Opportunity Coop Trainers 14 305 0 60 411 33 13 CU Landing Craft, Utility 40 305 0 60 3,860 890 351 DB Distribution Box 4 305 0 60 704 16 6 DT Diving Tender 1 305 0 60 813 5 2 DW Dive Workboat 7 305 0 60 539 22 9 HH Hawser Handling 7 305 0 60 400 16 6 HL Hydrographic Survey Launch 3 305 0 60 342 6 2 LA Landing Craft, Assault 1 305 0 60 2,745 16 6 LCM(3) Mechanized Landing Craft 2 305 0 60 not available

-- -- LCM(6) Mechanized Landing Craft 60 305 0 60 990 342 135 LCM(8) Mechanized Landing Craft 100 305 0 60 1,603 924 364 LCPL Landing Craft Personnel 130 305 0 60 332 249 98 LCVP 10 305 0 60 not available

-- -- LH Line Handling 3 305 0 60 400 7 3 MC Mine Countermeasure Support Craft 2 305 0 60 343 4 2 ML Motor Launch 3 305 0 60 256 4 2 MM Marine Mammal Support Craft 5 305 0 60 331 10 4 MW Motor Whaleboat 121 305 0 60 256 179 70 NM Noise Measuring 1 305 0 60 800 5 2 NS Non-Standard (commercial) 120 305 0 60 540 374 147 PE Personnel 211 305 0 60 352 428 169 PF Patrol Craft, Fast 3 305 0 60 539 9 4 PK Picket Boat 1 305 0 60 366 2 1 PL Landing Craft, Personnel Light 147 305 0 60 332 281 111 PR Plane Personnel and Rescue 8 305 0 60 392 18 7 PT Punt 266 305 0 60 83 127 50 SB Sound/Sail 1 305 0 60 350 2 1 SC Support Craft 6 305 0 60 400 14 5 SS Swimmer Support 12 305 0 60 400 28 11 ST Sail Training Craft 21 305 0 60 350 42 17 TC Training Craft 19 305 0 60 580 64 25 TD Target Drone 2 305 0 60 580 7 3 UB Utility Boat 793 305 0 60 398 1,819 717 VP Landing Craft, Vehicle Personnel 12 305 0 60 332 23 9 WB Workboat 263 305 0 60 620 940 370 WH Wherry 12 305 0 60 400 28 11

T Zero entered for number of transits per year when no further information was available. nsp = not self-propelled N/A = Not enough information available to calculate a wetted surface area.Table 1. Navy, MSC, and USCG, Army, and Air Force Mass Loadings for Ships, and Small Boats and Craft

Ship Class Ship Class Description Quantity of Ships per Class Days in Port

per Year Number of

Transits per year (each is a transit in and out) T Days of

Operation within 12

n.m. Ship's Wetted

Surface Area (sq ft) *Copper

Loading per ship class (kg/yr) **Zinc

Loading per ship class (kg/yr)
WT Warping Tug 1 305 0 60 2,662 15 6 YFRN Refrigerated/Covered Lighter 3 305 0 60 not available

-- -- YL Yawl 7 305 0 60 400 16 6 YTM Medium Harbor Tug (self-propelled) 11 305 0 60 3,170 201 79 AFDB 4 Large Auxiliary Floating Dry Dock 1 305 0 60 not available

-- -- AFDB 8 Large Auxiliary Floating Dry Dock 1 305 0 60 not available

-- -- AFDL 1 Small Auxiliary Floating Dry Docks 2 305 0 60 47,645 549 216 AFDM 14 Medium Auxiliary Floating Dry Dock 1 305 0 60 not available

-- -- AFDM 3 Medium Auxiliary Floating Dry Docks 4 305 0 60 47,645 1,099 433 AGER 2 1 305 0 60 not available

-- -- AGF 11 Raleigh Class Miscellaneous Command Ships 1 183 12 0 41,595 123 48 AGF 3 Austin Class Miscellaneous Command Ship 1 183 12 0 51,830 153 60 AGOR 21 Gyre Class Oceanographic Research Ships 1 113 11 0 8,834 16 6 AGOR 23 Thompson Class Oceanographic Research Ships 2 113 11 0 13,960 51 20 AGSS 555 Dolphin Class Submarine 1 305 0 60 9,130 53 21 AO 177 Jumboised Cimarron Class Oilers 5 188 10 0 63,185 955 376 AOE 1 Supply Class Fast Combat Support Ships 4 114 6 0 93,821 688 271 AOE 6 Sacramento Class Fast Combat Support Ship 3 183 11 0 103,520 916 361 APL Barricks Craft (nsp) 16 305 0 60 13,775 1,270 501 ARD 2 Auxiliary Repair Dry Docks 1 305 0 60 40,750 235 93 ARDM Medium Auxiliary Repair Dry Docks 3 305 0 60 47,645 824 325 ARS 50 Safeguard Class Savage Ships 4 208 22 0 13,299 181 71 AS 33 Emory S Land Class Submarine Tenders 1 293 6 0 59,630 278 109 AS 39 Simon Lake Class Submarine Tenders 3 229 6 0 59,630 653 257 ASDV 2 305 0 60 not available

-- -- CG 47 Ticonderoga Class Guided Missile Cruisers 27 166 12 0 37,840 2,743 1,081 CGN 36 California Class Guided Missile Cruiser 2 143 11 0 40,260 187 74 CGN 38 Virginia Class Guided Missile Cruiser 1 161 11 0 42,390 110 43 CV 59 Forrestal Class Aircraft Carrier 1 143 6 0 141,470 324 128 CV 63 Kitty Hawk Class Aircraft Carrier 3 137 7 0 141,470 934 368 CVN 65 Enterprise Class Aircraft Carrier 1 76 6 0 156,990 193 76 CVN 68 Nimitz Class Aircraft Carrier 7 147 7 0 159,500 2,633 1,038 DD 963 Spruance Class Destroyers 31 178 12 0 35,745 3,185 1,255 DDG 51 Arleigh Burke Class Guided Missile Destroyers 18 101 11 0 31,769 945 373 DDG 993 Kidd Class Guided Missile Destroyers 4 101 11 0 31,769 210 83 DSRV-1 Deep Submergence Rescue Vehicles 2 305 0 60 not available

-- -- DSV 1 Deep Submergence Vehicles 3 305 0 60 not available

-- -- FFG 7 Oliver Hazard Perry Guided Missile Frigates 43 167 13 0 19,850 2,310 910 IX 308 Unclassified Miscellaneous 2 305 0 60 5,180 60 24 IX 501 Unclassified Miscellaneous 1 305 0 60 8,365 48 19 IX 35 Barrick Ships 2 305 0 60 not available

-- -- EX YFU Harbor Utility Craft 1 305 0 60 4,160 24 9 SES 200 High Performance Test Platform (ex- USCG Dorado) 1 305 0 60 not available

-- -- LCC 19 Blue Ridge Class Amphibious Command Ships 2 179 8 0 51,250 294 116 LCU 1610 1600 Class Landing Craft Utility 40 200 6 0 3,915 500 197 LHA 1 Tarawa Class Amphibious Assault Ships 5 173 9 0 94,325 1,311 517 LHD 1 Wasp Class Amphibious Transport Docks 4 185 13 0 88,965 1,064 419 LPD 14 Amphibious Transport Docks 2 178 11 0 51,830 297 117

T Zero entered for number of transits per year when no further information was available. nsp = not self-propelled N/A = Not enough information available to calculate a wetted surface area.Table 1. Navy, MSC, and USCG, Army, and Air Force Mass Loadings for Ships, and Small Boats and Craft

Ship Class Ship Class Description Quantity of Ships per Class Days in Port

per Year Number of

Transits per year (each is a transit in and out) T Days of

Operation within 12

n.m. Ship's Wetted

Surface Area (sq ft) *Copper

Loading per ship class (kg/yr) **Zinc

Loading per ship class (kg/yr)
LPD 4 Austin Class Amphibious Transport Docks 3 178 11 0 51,830 446 176 LPD 7 Amphibious Transport Docks 3 178 11 0 51,830 446 176 LPH 2 Iwo Jima Class Amphibious Assault Ships 2 186 11 0 49,945 299 118 LSD 36 Anchorage Class Dock Landing Ships 5 215 13 0 45,405 786 310 LSD 41 Whidbey Island Class Dock Landing Ships 8 170 13 0 51,020 1,124 443 LSD 49 Harpers Ferry Dock Landing Ships 3 215 13 0 41,595 432 170 LST 1179 Tank Landing Ships 3 178 11 0 34,650 298 118 MCM 1 Avenger Class Mine Countermeasures Vessels 14 232 28 0 8,410 449 177 MHC 51 Osprey Class Coastal Minehunters 12 232 28 0 6,418 294 116 PC Cyclone Class Coastal Defense Ships 13 105 18 0 3,704 84 33 SLWT Side Loadable Warping Tugs 24 305 0 0 not available

-- -- SSBN 726 Ohio Class Ballistic Missile Submarine 17 183 6 0 74,575 3,704 1,460 SSN 640 Sturgeon Class Attack Submarine 13 183 6 0 27,075 1,028 405 SSN 688 Los Angeles Class Attack Submarine 56 183 6 0 34,765 5,688 2,242 SSN 671 Narwhal Class Submarines 1 183 6 0 29,135 85 34 SSN 637 Benjamin Franklin Class Submarines 2 183 6 0 44,061 257 101 YC Open Lighters (nsp) 254 305 0 60 6,475 9,480 3,736 YCF Car Float (nsp) 1 305 0 60 not available

-- -- YCV Aircraft Transportation Lighters (nsp) 9 305 0 60 not available

-- -- YD Floating Cranes (nsp) 63 305 0 60 12,875 4,676 1,843 YDT Diving Tenders 3 305 0 60 8,885 154 61 YFB Ferryboat or Launch (nsp) 2 305 0 60 3,895 45 18 YFN Covered Lighters (nsp) 157 305 0 60 6,680 6,046 2,383 YFNB Large Covered Lighters (nsp) 11 305 0 60 15,955 1,012 399 YFND Dry Dock Companion Craft (nsp) 2 305 0 60 not available

-- -- YFNX Lighter - Special Purpose (nsp) 8 305 0 60 4,760 220 87 YFP Floating Power Barges (nsp) 2 305 0 60 15,590 180 71 YFRT Covered Lighters - Range Tender (self propelled) 2 305 0 60 5,490 63 25 YFU 83 Harbor Utility Craft (self propelled) 1 305 0 60 3,915 23 9 YFU 91 Harbor Utility Craft (self propelled) 1 305 0 60 3,915 23 9 YGN 80 Garbage Lighters (nsp) 3 305 0 60 not available

-- -- YLC Salvage Lift Crane (nsp) 1 305 0 60 not available

-- -- YM Dredges (self propelled) 2 305 0 60 not available

-- -- YMN Dredge (nsp) 1 305 0 60 not available

-- -- YNG Gate Craft (nsp) 2 305 0 60 4,760 55 22 YO 65 Fuel Oil Barges (self propelled) 3 305 0 60 10,205 176 70 YOG 5 Gasoline Barges (self propelled) 2 305 0 60 10,205 118 46 YOGN Gasoline Barges (nsp) 12 305 0 60 8,512 589 232 YON Fuel Oil Barges (nsp) 48 305 0 60 8,512 2,355 928 YOS Oil Storage Barges (nsp) 14 305 0 60 8,512 687 271 YPD Floating Pile Drivers (nsp) 4 305 0 60 not available

-- -- YR Floating Workshops (nsp) 25 305 0 60 7,350 1,059 417 YRB Repair and Berthing Barges (nsp) 4 305 0 60 4,320 100 39 YRBM Repair, Berthing and Messing Barges (nsp) 39 305 0 60 10,180 2,289 902 YRDH Floating Dry Dock Workshop (Hull) (nsp) 1 305 0 60 not available

-- -- YRR Radiological Repair Barges (nsp) 9 305 0 60 6,405 332 131 YRST Salvage Craft Tenders (nsp) 3 305 0 60 10,965 190 75 YSD 11 Seaplane Wrecking Derrick (self propelled) 1 305 0 60 3,845 22 9

T Zero entered for number of transits per year when no further information was available. nsp = not self-propelled N/A = Not enough information available to calculate a wetted surface area.Table 1. Navy, MSC, and USCG, Army, and Air Force Mass Loadings for Ships, and Small Boats and Craft

Ship Class Ship Class Description Quantity of Ships per Class Days in Port

per Year Number of

Transits per year (each is a transit in and out) T Days of

Operation within 12

n.m. Ship's Wetted

Surface Area (sq ft) *Copper

Loading per ship class (kg/yr) **Zinc

Loading per ship class (kg/yr)
YSR Sludge Removal Barges (nsp) 14 305 0 60 not available

-- -- YTB 752 Large Harbor Tug (self propelled) 1 305 0 60 3,170 18 7 YTB 756 Large Harbor Tugs (self propelled) 3 305 0 60 3,265 56 22 YTB 760 Large Harbor Tugs (self propelled) 68 305 0 60 3,265 1,280 504 YTL 422 Small Harbor Tug (self propelled) 1 305 0 60 1,015 6 2 YTT 9 Torpedo Trails Craft (self propelled) 3 305 0 60 not available

-- -- YWN Water Barges (nsp) 6 305 0 60 not available

-- --

MILITARY SEALIFT COMMAND T-AE Kilauea Class Ammunition Ships 8 26 4 0 54,240 187 74 T-AFS Mars Class Combat Stores Ships 8 148 7 0 46,930 891 351 T-AG Mission Class Navigation Research Ship 2 151 10 0 59,126 288 114 T-AGM Compass Island Class Missile Instrumentation Ship 1 133 4 0 47,791 101 40 T-AGOS Stalwart Class Ocean Surveillance Ship 5 70 4 0 10,987 62 24 T-AGOS Victorious Class Ocean Surveillance Ship 4 107 5 0 14,679 101 40 T-AGS Silas Bent Class Surveying Ships 2 44 6 0 13,913 20 8 T-AGS Waters Class Surveying Ships 1 7 1 0 36,590 4 2 T-AGS John McDonnell Class Surveying Ships 2 96 6 0 10,085 31 12 T-AGS Pathfinder Class Surveying Ships 4 96 6 0 19,383 120 47 T-AH Mercy Class Hospital Ships 2 184 2 0 123,862 722 285 T-AKR Algol Class Vehicle Cargo Ships 8 109 3 0 111,650 1,552 612 T-AKR Maersk Class Fast Sealift Ships 3 59 9 0 107,028 314 124 T-AO Henry J Kaiser Class Oilers 13 78 6 0 44,511 731 288 T-ARC Zeus Class Cable Repairing Ship 1 8 2 0 41,176 6 2 T-ATF Powhatan Class Fleet Ocean Tugs 7 127 16 0 11,398 167 66

COAST GUARD WAGB Polar Class Icebreakers 2 148 4 100 36,132 285 112 WAGB Mackinaw Class Icebreakers 1 215 4 150 19,167 111 44 WHEC Hamilton and Hero Class High Endurance Cutters 12 151 13 0 17,339 510 201 WIX Eagle Class Sail Training Cutter 1 188 7 150 12,264 66 26 WLB Juniper Class Seagoing Buoy Tenders 16 190 18 100 10,357 775 305 WLB Balsam Class Buoy Tender WLB 180A 8 190 18 100 6,751 252 100 WLB Balsam Class Buoy Tender WLB 180B 2 120 5 100 6,751 47 19 WLB Balsam Class Buoy Tender WLB 180C 13 123 16 100 6,751 316 125 WLI Inland Buoy Tender WLI 100A 1 160 0 205 2,432 14 6 WLI Inland Buoy Tender WLI 100C 1 160 0 205 2,068 12 5 WLI Inland Buoy Tender WLI 65303 2 160 0 205 1,037 12 5 WLI Inland Buoy Tender WLI 65400 2 160 0 205 1,142 13 5 WLIC Inland Construction Tender 115 1 160 0 205 2,796 16 6 WLIC 100 Cosmos Class Inland Construction Tenders 3 160 0 205 2,432 42 17 WLIC 75A Anvil Class Construction Tenders 2 160 0 205 1,753 20 8 WLIC 75B Inland Construction Tenders 3 160 0 205 1,753 30 12 WLIC 75D Clamp Class Inland Construction Tenders 2 160 0 205 1,753 20 8 WLIC 115 Inland Construction Tenders 1 160 0 205 2,796 16 6 WLIC 160 Pamlico Class Inland Construction Tenders 4 160 0 205 5,113 118 46 WLM White Sumac Class Coastal Buoy Tenders 9 123 16 200 4,648 217 85 WLM Keeper Class Coastal Buoy Tenders 14 123 16 200 6,408 465 183

T Zero entered for number of transits per year when no further information was available. nsp = not self-propelled N/A = Not enough information available to calculate a wetted surface area.Table 1. Navy, MSC, and USCG, Army, and Air Force Mass Loadings for Ships, and Small Boats and Craft

Ship Class Ship Class Description Quantity of Ships per Class Days in Port

per Year Number of

Transits per year (each is a transit in and out) T Days of

Operation within 12

n.m. Ship's Wetted

Surface Area (sq ft) *Copper

Loading per ship class (kg/yr) **Zinc

Loading per ship class (kg/yr)
WMEC Diver Class Medium Endurance Cutters 1 98 9 0 8,954 14 6 WMEC Storis Class Medium Endurance Cutters 1 167 11 0 9,498 26 10 WMEC Reliance Class Medium Endurance Cutters 5 235 13 0 10,976 207 82 WMEC Reliance Class Medium Endurance Cutters 11 149 9 0 10,976 290 114 WMEC Famous Class Medium Endurance Cutters 4 137 6 0 10,976 96 38 WMEC Famous Class Medium Endurance Cutters 9 164 7 0 10,976 259 102 WPB Island Class Patrol Craft A 16 135 6 200 2,171 185 73 WPB Island Class Patrol Craft B 21 135 6 200 2,171 243 96 WPB Island Class Patrol Craft C 12 135 6 200 2,171 139 55 WPB Point Class Patrol Craft B 1 135 6 200 1,243 7 3 WPB Point Class Patrol Craft C 28 135 6 200 1,243 185 73 WPB Point Class Patrol Craft D 8 135 6 200 1,243 53 21 WTGB Bay Class Icebreaking Tugs 9 215 1 150 4,869 253 100 WYTL 65 ft. Class Harbor Tugs A 3 50 6 300 1,083 18 7 WYTL 65 ft. Class Harbor Tugs B 3 50 6 300 1,083 18 7 WYTL 65 ft. Class Harbor Tugs C 3 50 6 300 1,083 18 7 WYTL 65 ft. Class Harbor Tugs D 2 50 6 300 1,083 12 5

ARMY BCDK Barge, conversion deck enclosure kit 3 305 0 60 3,376 58 23 BD 89 Ton Derrick Barge (nsp) 12 335 0 30 10,442 722 285 BK Cargo Barge (nsp) 2 335 0 30 1,947 22 9 BPL Barge, pier, self-elevating 1 305 0 60 N/A

-- -- FB 3 305 0 60 N/A

-- -- FMS Floating Machine Shop 3 305 0 60 3,775 65 26 J-BOAT Workboat, Picket Boat 6 305 0 60 771 27 11 LARC-LX Lighter, Amphibious, Resupply, Cargo 23 305 0 60 1,209 160 63 LCM-8 Landing Craft, Mechanized 104 305 0 60 1,603 961 379 LCU-1600 1600 Class Landing Craft Utility 13 305 0 60 3,557 267 105 LCU-2000 2000 Class Landing Craft Utility 35 275 3 60 6,646 1,234 486 LSV Landing Ship, Vehicle 6 150 20 30 17,470 309 122 LT Large Tug (100'-128') 16 305 0 60 3,026 279 110 Q-BOAT Workboat (over 50') 1 305 0 60

-- -- ST-65 65 ft Small Tug 11 305 0 60 1,381 88 35

AIR FORCE B Barge 4 305 0 60 N/A

-- -- DT 2 305 0 60 N/A

-- -- MR Missile Retrievers 6 305 0 60 1,954 68 27 TG Small Tug 2 305 0 60 721 8 3 TR Torpedo Retriever 3 305 0 60 2,127 37 14 Total Loading 98,257 38,725 * = Based on a dynamic copper leaching rate of 17 ug/cm 2 /day. ** = Based on a dynamic zinc leaching rate of 6.7 ug/cm 2 /day. NOTES: 1) A transit includes inbound and outbound legs of 4 hours between the 12 n.m. limit and port.

2) Small boats and craft of the Navy were assumed to spend 365 days per year within 12 n.m. and 60 of those days underway within 12 n.m.

T Zero entered for number of transits per year when no further information was available. nsp = not self-propelled N/A = Not enough information available to calculate a wetted surface area.Table 1. Navy, MSC, and USCG, Army, and Air Force Mass Loadings for Ships, and Small Boats and Craft

Ship Class Ship Class Description Quantity of Ships per Class Days in Port

per Year Number of

Transits per year (each is a transit in and out) T Days of

Operation within 12

n.m. Ship's Wetted

Surface Area (sq ft) *Copper

Loading per ship class (kg/yr) **Zinc

Loading per ship class (kg/yr) 3) Number of workboats estimated 4) Tank Landing Ships (LST) assumed to have similar operations to other amphibious assault ships 5) All vessels of the Army and Air Force assumed to have movement characteristics similar to coastal vessels of the Navy 6) Italicized ship class descriptions are assumed, since only the ship class (letter) designation and quantity were provided.

T Zero entered for number of transits per year when no further information was available. nsp = not self-propelled N/A = Not enough information available to calculate a wetted surface area.

### Table 2. Estimated TBT Mass Loadings within 12 n.m. from Small Boats and Craft

Class Description Quantity Total Wetted Surface Area per Class (sq ft)

Navy Small Boats and Craft PB Mark III Patrol Boats 11 1,835 20,185 PB Mark IV Patrol Boat 3 2,368 7,104 PBR Stinger Class River Patrol Boat 25 410 10,250 ATC Mini Armored Troop Carrier b 20 810 16,197 TR Torpedo Retrievers 22 2,127 46,794 HS Harbor Security Boat 70 189 13,230 LARC-LX Lighter Amphibious Resupply Cargo 23 1,214 27,922 WB Boom Handling Workboat 25 340 8,499
WB 35ft Workboat b.c 50 620 30,990 YP 654 Patrol Craft, Training 1 1,302 1,302 YP 676 Patrol Craft, Training 27 2,302 62,154

Total Number of Small Boats and Craft 277 Net Surface Area 244,627 Small Boats and Craft w/TBT Coatings 55 TBT Coated Area 48,572

Coast Guard Small Boats and Craft

Motor Lifeboats 6 535 3,213 Small Boats 44 513 22,576 TBT Coated Area 25,789

Army Small Boats and Craft PB-HS Patrol Boat, High Speed 10 189 1,890 T-BOAT Small Freight (under 100') 1 not available TBT Coated Area 1,890

### Table 2. Estimated TBT Mass Loadings within 12 n.m. from Small Boats and Craft

Class Description Quantity Vessel Wetted Surface Area (sq ft) a Total Wetted Surface Area per Class (sq ft)

Air Force Small Boats and Craft
U h Utility Craft j 47 398 18,706
P i Patrol Boat j 3 1,235 3,704 TBT Coated Area 22,410

Total Surface Area of all Vessels with TBT Coatings (sq. ft) 98,661 Total Surface Area of all Vessels with TBT Coatings (sq. cm) 91,656,090 Loading (kg/yr) with 20% of Navy small boats and craft having TBT paint = 12.7

Final total (kg/yr) after adjusting for time spent out of water 11.4

Sample Calculation for TBT Loading per Vessel Class (kg/yr): Quantity of Vessels x Vessel Wetted Surface Area (ft 2 ) x TBT Leaching Rate ( μ g/cm 2 )/day... ...x (0.90 x 365 days/yr) x (6.452 cm 2 /in 2 ) x (144 in 2 /ft 2 ) x (10 -9 kg/mg)

Notes: a) Where available, beam measurements are at the waterline. b) This craft or boat is rectangular. c) No information was available regarding quantities of workboats by class. The quantities listed are not reliable. d) TBT Loadings based on all operations per ship occurring within 12 n.m. and applying a 10% factor to subtract the time that some small boats and craft spend completely out of water. e) The steady state TBT leaching rate was taken from a Naval Command, Control & Ocean Surveillance Center RDT&E Division Hull Coatings Discharge Evaluation on Butyltin Concentrations Measurements in Pearl Harbor, Hawaii from April 1986 to January 1988. f) Steady-state TBT release rate assumed to be (0.38 μ g/cm 2 )/day. g) 20% of all Navy small boats and craft are assumed to have TBT coated hulls. h) Air Force "P" designators are assumed to have similar size as the Coast Guard Point Class Patrol Craft. i) Air Force "U" designator is assumed to have a similar size to the Navy utility boat. j) Italicized ship class descriptions are assumed, since only the ship class (letter) designation and quantity were provided.

### Table 3. A Comparison of Estimated Concentrations Versus Water Quality Criteria

Constituent Estimated Environmental

Concentration ( μ g/L) a Federal Chronic Water Quality Criteria ( μ g/L) Most Stringent State Chronic Water Quality Criteria ( μ g/L) Copper (dissolved) 0.19-3.0 2.4 2.4 (CT, MS)

Zinc (dissolved) 5.0-12.8 81 76.6 (WA)

TBT 0.00002 - 0.0003 0.01 b 0.001 (VA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995)

CT - Connecticut MS - Mississippi VA= Virginia WA- Washington

a Range is for three high use Navy ports: San Diego, CA; Mayport, FL; and Pearl Harbor, HI. b Proposed water quality criteria, August 7, 1997

### Table 4. Copper and Zinc Loading into San Diego, Pearl Harbor, and Mayport for Use in Concentration Estimate

Ship Class Ship Class Description Quantity of Ships per Class *Copper Loading

per year (kg/yr) *Zinc Loading

per year (kg/yr) SAN DIEGO HARBOR CG 47 Ticonderoga Class Guided Missile Cruisers 8 813 320 CV 63 Kitty Hawk Class Aircraft Carrier 2 623 245 DD 963 Spruance Class Destroyers 6 616 243 DDG 51 Arleigh Burke Class Guided Missile Destroyers 5 263 104 LHA 1 Tarawa Class Amphibious Assault Ships 2 524 207 LHD 1 Wasp Class Amphibious Transport Docks 2 532 210 LPD 4 Austin Class Amphibious Transport Docks 5 743 293 LSD 41 Whidbey Island Class Dock Landing Ships 2 281 111 LSD 49 Harpers Ferry Dock Landing Ships 1 144 57 PC Cyclone Class Coastal Defense Ships 4 26 10 FFG 7 Oliver Hazard Perry Guided Missile Frigates 11 590 233 SSN Los Angeles Class Attack Submarines 9 914 360 SSN Sturgeon Class Attack Submarine 1 79 31 LSD Anchorage Class Dock Landing Ships 3 472 186 AGF Raleigh Class Miscellaneous Flagship 1 123 48 AS Emory S Land Class Submarine Tender 1 278 109 LPH Iwo Jima Class Assault Ship 1 150 59 Total Loading = 7,171 2,826

PEARL HARBOR AO 177 Jumboised Cimarron Class Oilers 2 382 150 ARS 50 Safeguard Class Savage Ships 2 91 36 CG 47 Ticonderoga Class Guided Missile Cruisers 3 305 120 DD 963 Spruance Class Destroyers 4 411 162 DDG 51 Arleigh Burke Class Guided Missile Destroyers 3 158 63 FFG Oliver Hazard Perry Guided Missile Frigates 2 107 42 SSN Los Angeles Class Attack Submarine 15 1,524 601 SSN Sturgeon Class Attack Submarine 4 316 125 SSN Benjamin Franklin Class Submarines 1 129 51 Total Loading = 3,423 1,350

MAYPORT HARBOR CG 47 Ticonderoga Class Guided Missile Cruisers 5 508 200 CV 63 Kitty Hawk Class Aircraft Carrier 1 311 123 DD 963 Spruance Class Destroyers 5 514 202 DDG 51 Arleigh Burke Class Guided Missile Destroyers 2 105 41 FFG Oliver Hazard Perry Guided Missile Frigates 10 537 212 Total Loading = 1,975 778

### Table 5. Estimated Copper and Zinc Contributions to Some Ports of the Armed Forces

Port Ambient Cu

Concentration ( μ g/L) Cu from Hull

Coating Leachate ( μ g/L) Ambient Zn

Concentration ( μ g/L) a Zn from Hull

Coating Leachate ( μ g/L) San Diego 3.7 b 0.19 11.3 0.074 Mayport Unknown c 3.0 5.0 1.16 Pearl Harbor 1.76 a 1.0 12.8 0.39

a Information from STORET database. b For San Diego Bay, information from prior Navy Studies.

c Available STORET information was insufficient to make estimate.



### Table 6. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents MSDS X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species XCopper Loading = (release rate)(surface area)(Number of ships)(time), where:
release rate = daily dynamic release rate of copper kg/cm 2 surface area = wetted surface area of a DD 963 Class ship (cm 2 ) Number of ships = total number of ships in DD 963 Class time = { ∑ (time in port + time in transit + time in operation within 12 n.m.)}(number of DD 963 Class ships)(number of days within 12 n.m. each year per ship)
1) Daily dynamic release rate of copper (From NRaD study) = 17 ( μ g/cm 2 )/day = (17 ( μ g/cm 2 )/day) (1 kg / 1,000,000,000 μ g) = 17 x 10 -9 (kg/cm 2 )/day
2) Wetted surface area of a DD 963 Class ship in cm 2 (From NSTM Chapter 633) = (35,745 ft 2 ) (929 cm 2 /ft 2 ) = 33,207,105 cm 2 /ship
3) Number of DD 963 Class ships = 31 ships (From ship inventory database)
4) Number of days within 12 n.m. each year per ship (From ship movement database) = days in port/year + [(transits/year) (2 legs/transit) (4 hrs/leg) (1 day/24 hours)] + days operation within 12 n.m./yr = 178 days/yr + [(12 transits/yr) (2 legs/transit) (4 hrs/leg) (1 day/24 hrs)] + 0 days/yr = 182 days/yr

Thus: Copper Loading = (17 x 10 -9 (kg/cm 2 )/day )(33,207,105 cm 2 /ship)(31 ships)(182 days/yr)

= 3,185 kg/yr = 7,007 lbs/yr



### Calculation Sheet 1. Mass Loading of Copper from DD 963 Class Vessels

### Calculation Sheet 2. Estimates of Contributed TBT Concentrations by Harbor Copper loading in San Diego = 7,171 kg/yr (See Table 4) Copper loading in Pearl Harbor = 3,423 kg/yr (See Table 4) Copper loading in Mayport = 1,975 kg (Se e Table 4)
Total copper loading = 98,257 kg/yr (See Table 1)
Proportion of copper loading in each harbor to the total copper loading: San Diego = (7,171 kg/yr) / (98,257 kg/yr) = 0.073 (or 7.3%) Pearl Harbor = 0.035 (or 3.5%) Mayport = 0.020 (or 2%)
Total estimated TBT loading = 11.4 kg/yr (See Table 2)
Estimated TBT loading in each harbor = (copper proportion) (total TBT loading): San Diego = (0.073) (11.4 kg/yr) = 0.8 kg/yr Pearl Harbor = (0.035) (11.4 kg/yr) = 0.4 kg/yr Mayport = (0.020) (11.4 kg/yr) = 0.2 kg/yr
Proportion of copper concentration in each harbor (Table 5) to annual copper loading in the respective harbor:

San Diego = (0.19 x 10 -6 g/L Cu) / (7,171 x 10 3 g Cu) = 2.7 x 10 -14 Pearl Harbor = (1 x 10 -6 g/L Cu) / (3,423 x 10 3 g Cu) = 2.9 x 10 -13 Mayport = (3 x 10 -6 g/L Cu) / (1,975 x 10 3 g Cu) = 1.5 x 10 -12

Estimated TBT concentration in each harbor is proportional to copper ratio: San Diego: (0.19 μ g/L Cu) / (7,171 kg Cu) = (X μ g/L TBT) / (0.8 kg TBT)

X = (2.7 x 10 -14 ) ( 0.8 x 10 3 g TBT) = 2.2 x 10 -5 μ g/L TBT Pearl Harbor: X = (2.9 x 10 -13 ) (0.4 x 10 3 g TBT) = 1.2 x 10 -4 μ g/L TBT Mayport: X = (1.5 x 10 -12 ) (0.2 x 10 3 g TBT) = 3.0 x 10 -4 μ g/L TBT

### Hull Coating Leachate MPCD Analysis 1 HULL COATING LEACHATE MARINE POLLUTION CONTROL DEVICE (MPCD) ANALYSIS

Several alternatives were investigated to determine if any reasonable and practicable MPCDs exist or could be developed for controlling discharges from hull coatings. An MPCD is defined as any equipment or management practice, for installation or use onboard a vessel, designed to receive, retain, treat, control, or eliminate a discharge incidental to the normal operation of a vessel. Phase I of UNDS requires several factors to be considered when determining which discharges should be controlled by MPCDs. These include the practicability, operational impact, and cost of an MPCD. During Phase I of UNDS, an MPCD option was deemed reasonable and practicable even if the analysis showed it was reasonable and practicable only for a limited number of vessels or vessel classes, or only on new construction vessels. Therefore, every possible MPCD alternative was not evaluated. A more detailed evaluation of MPCD alternatives will be conducted during Phase II of UNDS when determining the performance requirements for MPCDs. This Phase II analysis will not be limited to the MPCDs described below and may consider additional MPCD options.
MPCD Options
Hull coating leachate refers to the transfe r by diffusion or ablation of coating constituents from the underwater portion of a vessel’s hull into the water. The anticorrosive (AC) and antifouling (AF) coating system minimizes adhesion and propagation of marine fouling organisms on the hull surface which increase drag, and prevents costly structural damage to the hull (metal or material loss) which would otherwise result from long-term exposure to seawater. Without effective antifouling coatings, ships’ hulls would have to be cleaned or dry docked and repainted much more frequently; thereby expending time, money, and manpower, while compromising operational readiness.
To determine the practicability of mitigating the potentially adverse environmental effects of hull coating leachate, three potential MPCD options were investigated. The purpose of these MPCDs would be to reduce or eliminate the release of antifouling agents, specifically copper and tributyltin, from antifouling hull coatings. The MPCD options were selected based on initial screenings of alternate materials, equipment, pollution prevention options, and management practices. They are listed below with brief descriptions of each:
Option 1: Use Less Toxic Fouling Release Coatings - This option would require that hulls be coated with less toxic paints that may initially foul, but readily release fouling organisms when the vessel reaches a target speed.
Option 2: Control the Maximum Allowable AF Release Rate - This option would set limits on the maximum allowable release rate of copper from fouling resistant coatings to a level known to effectively control fouling but not cause an excess of copper to be released.

### Hull Coating Leachate MPCD Analysis 2 Option 3: Limit or Eliminate Use of Tributyltin (TBT) Paints - The goal of this option is to further reduce or eliminate the use of TBT paints on Armed Forces vessels.
MPCD Analysis Results
Table 1 shows the results of the MPCD analysis. It contains information on the elements of practicability, effect on operational and warfighting capabilities, cost, environmental effectiveness, and a final determination for each option. Based on these findings, Option 2 – establishing the maximum release rate of copper in AF coatings, and Option 3 – further restricting the application of TBT paints on vessels of the Armed Forces, offer the best combination of these elements and are each considered to represent a reasonable and practicable MPCD.

### Hull Coating Leachate MPCD Analysis 3 Table 1. MPCD Option Analysis and Determination

MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

Option 1. Use Less Toxic Fouling Release Coatings Since 1993, the Navy hasbeen investigating nonpolluting antifouling hull coatings and, as part of this program, silicone-based coatings are being tested on Navy ships. When the tests are completed, the coating must demonstrate a five to twelve year service life, ease of self and mechanical cleaning, good adhesion to various hull substrates, and overall durability. The coating may not be suitable for low speed ships. If the new coating does not perform on Navy ships as well as the current coatings, marine fouling will increase, detrimentally affecting the ship’s acoustic signature, vessel speed, endurance, maneuverability, and fuel consumption. Costs for this option include research and developmentcosts and an estimated fourfold increase in paint costs. If the self-cleaning coatingis not as effective at biofouling prevention as current hull coating technologies, maintenance costs will increase and fuel costs could increase by 15%. 1 

### If the self-cleaning coating is effective, maintenance costs will decrease. Disposal costs will decrease because hazardous waste is no longer generated. Use of less toxic coatings would significantly reduce the amount of copper and zinc discharged from antifouling hull paints. Using less toxic fouling release coatings would reduce toxic discharge levels, but may not effectively prevent hull fouling which would adversely affect ship capabilities and increase fuel and maintenance costs. The technology has not yet been proven aboard vessels of the armed forces.

Option 2. Control the Maximum Allowable AF Release Rate This option could be implemented by establishing a maximum copper release rate that is near the release rate of the lowest acceptable release rate. The Navy has tested ablative copper paints containing 28-32% cuprous oxide, as opposed to the standard 40-50%. 2 

### These trial formulations of AF coatings did not prevent fouling. Setting the release rate below what is determined to be effective Ship capabilities will not be affected if limits are set near current copper release rates. If the maximum copper release rate is set below what is effective in preventing hull fouling then noise emissions will increase, affecting acoustic signature; maximum speed will decrease; and the frequency of hull cleanings will increase, affecting ship mobility and availability. In order to accurately define minimum copper release rates, it would cost an estimated $300K to $500K. If hull fouling is not adequately prevented, there will be an increase in fuel and maintenance costs. This option would prevent future increases in ambient water concentrations of copper from hull coatings, and would potentially reduce copper discharge quantities. Establishing a maximum copper release rate: 1) can be implemented, 2) would be inexpensive to institute, and 3) would prevent future increases in copper loadings. This MPCD warrants further consideration in Phase II.

### Hull Coating Leachate MPCD Analysis 4 MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

Option 2 (continued) would be impractical because of the potential for excess fouling and increased rates of hull cleaning. Option 3. Limit or Eliminate Use of TBT Paints The Armed Forces have been phasing out the use of TBT paints since 1988, andreplacing them with copperor silicone-based coatings. Copper-based AF paints accelerate corrosion of aluminum substrates. Newer silicone-based coatings are only effective when the vessel reaches a minimum effective speed, which some Navy and USGS vessels are unable to attain. Exceptions could be provided for critical use vessels. No AF alternative aseffective as TBT selfpolishing copolymer paint has been found so, without the use of TBT, underwater hull fouling is expected to increase causing a negative impact on acoustic signature, maximum ship speed, hull cleaning frequency, and ship readiness. Assuming TBT paint is replaced by silicone-based easy release coatings, material costs could increase by $91K for all remaining small boats, fuel costs will increase, and maintenance costs may increase if ships have to be recoated more frequently, yet disposal costs will decrease since TBT is a hazardous waste. Prohibiting the use of TBT as an antifouling hull coating for non-critical Navy and USCG small boats will be effective in reducing TBT loadings. Approximately 80% of the estimated 11 kg (24 lbs) of TBT released annually by the Armed Forces could be eliminated. If replaced by copper-based AF coatings, total copper loading from hull coatings will increase slightly. Further restricting the use of TBT paints is: 1) reasonable to implement, 2) not cost prohibitive, and 3) will significantly reduce TBT loadings in the environment. Therefore, this MPCD option warrants further consideration.

### Hull Coating Leachate MPCD Analysis 5 REFERENCES

1 

### Naval Ships’ Technical Manual S9086-CQ-STM-010 R3 Chapter 081, Waterborne Underwater Hull Cleaning of Navy Ships. 4 August 1997. Page 1-1.

2 

### EPA and the Secretary of the Navy. “Congressional Report on Alternatives to Organotin Antifoulants and Alternative Antifoulant Research.” December 1996. Pages 8, 29.

### Mine Countermeasures Equipment Lubrication 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of t he discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Mine Countermeasures Equipment Lubrication

### Mine Countermeasures Equipment Lubrication 2 2.0 DISCHARGE DESCRIPTION
This section describes the mine countermeasures discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
The Navy is the only branch of the Armed Forces with a mine countermeasures mission. To accomplish this mission, mine countermeasures vessels use towed sonar and video arrays, cable cutters, and mine detonation equipment. During training exercises, the mine countermeasures equipment is deployed and towed behind the ship as it practices sweeping the area for mines.
Specific types of mine countermeasures equipment are:

• devices to detonate acoustic mines, such as acoustic hammers and vibrating diaphragms;

• robotic devices (mine neutralization vehicles) which locate and destroy mines;

• devices which generate magnetic fields to explode magnetic mines;

• minehunting sonar; and

• cables fitted with mechanical or explosive cutters to cut the cables of moored mines.
Mine countermeasures equipment is normally located at the stern or fantail portion of mine countermeasures vessels. Most equipment is non-magnetic, and winches and cranes are hydraulically powered. Brief descriptions of the specific mine countermeasures equipment used by the Navy are presented below: 1



### A-MK4-V and A-MK6-B mine detonators use vibrating diaphragms and acoustic hammers, respectively, to generate noise and detonate acoustic mines. When deployed, both types of acoustic detonators are towed astern on buoyant 1,600-foot-long cables. Both types of detonators are not deployed simultaneously but rather, one detonator type is selected for a given minesweeping event, depending on the type of mine targeted.
Magnetic minesweeping cables float, are trailed astern of the ship, and generate large electric currents through the water. This creates a magnetic field around the cable which detonates magnetic mines. Several cable configurations are used and all are carried on a common cable reel drum with three sections. Cable lengths range from 450 to 1,800 feet for the various configurations.

AN/SLQ-48 mine neutralization vehicles (MNVs) are cable-controlled,unmanned robotic devices used to locate and destroy mines. They contain closedcircuit television cameras and close-range sonar for locating mines, that are then

### Mine Countermeasures Equipment Lubrication 3 destroyed using cable cutters or small explosive charges. A crane with a lifting cable is used to deploy and recover the AN/SLQ-48 MNV on some vessels. A 5,000-foot-long cable is used to supply power.

AN/SQQ-32 sonar tow cables and reels are used to tow and supply power to AN/SQQ-32 variable-depth, mine-hunting sonars.

AN/SQQ-30 sonar tow cable and reels are used to tow and supply power to older, less-capable mine hunting sonars used on some ships. These systems will eventually be replaced with AN/SQQ-32 sonars.
O-type mechanical gear is used to sweep moored mines. It consists of wire cables towed through the water at depths where it can strike the mine’s mooring. The mooring slides along the cable until it contacts mechanical or explosive cutters, which sever the mooring. The mines then bob to the surface where they are detonated by gunfire.
A typical layout of mine countermeasures equipment on the fantail of a mine countermeasures ship is provided in Figure 1. Figure 2 shows a schematic of an O-type setup used to sweep moored mines. 1



### 2.2 Releases to the Envir onment
This discharge consists of the lubricating grease and oil removed by the mechanical action of seawater as the equipment is towed. Greases and oils are used externally on wetted equipment (e.g., blocks, swivels, and cutters) to minimize wear and to prevent the mine countermeasures equipment from binding as it is deployed. 2 

### Tow cables are made of stainless steel and are not lubricated, with the exception of the lifting cable on the crane of MHC 51 Class vessels, which is grease-lubricated. 3,4 

### Grease and oil application procedures are discussed in Section 3.
Lubricants used on mechanical components inside the water-tight compartments of towed acoustic and electromagnetic devices are not released from the devices to the sea. Neither are leaks and spills of lubricants to the deck from non-wetted, on-board mine countermeasures equipment; these are cleaned-up and contained using rags or other sorbents. 5



### 2.3 Vessels Producing the Discharge
Mine countermeasures equipment is found on only two classes of Armed Forces vessels: the Navy’s Osprey (MHC 51) Class, and the Navy’s Avenger (MCM 1) Class. 1 

### The nine MHC 51 Class coastal minehunters perform harbor clearing, channel clearing, and deep-water coastal mine countermeasures. The MCM 1 Class has 14 vessels designed to locate and destroy mines that cannot be countered by conventional minesweeping techniques. Table 1 shows the vessels producing the mine countermeasures equipment lubrication discharge. 1

### Mine Countermeasures Equipment Lubrication 4 Both the MCM and the MHC classes are equipped wi th a hull-mounted, variable-depth sonar (VDS) (either a SQQ-30 or a newer SQQ-32) as their primary means of mine detection, and a cable-controlled and powered SLQ-48 Mine Neutralization Vehicle (MNV) for the examination and clearing of mines.
MHC 51 Class vessels are equipped only with the SLQ-48 MNV and the SQQ-32 sonar. The SQQ-32 is retained in its hull-mounted position unless the vessel is actually engaged in minehunting, when it may be towed. An MHC conducts minehunting operations at speeds of five to seven knots. At these speeds, depending upon its deployed depth, the 7,846-pound towed body of the SQQ-32 tows directly beneath or sometimes slightly astern of the MHC. 6 

### To sweep or neutralize mines, the SLQ-48 is deployed. It is a self-propelled vehicle, controlled and powered through a 5,000-ft cable, and is remotely ‘piloted’ by an operator on the MHC.
In addition to a SQQ sonar and a SLQ-48 MNV, MCM 1 class vessels are equipped with the O-type mechanical gear, magnetic minesweeping cables, and A-MK4-V and A-MK6-B mine detonators described in Section 2.1. 7 

### Like the MHCs, MCMs retain their SQQ sonar in the hullmounted position unless the vessel is engaged in minehunting. MCMs generally deploy their gear based on the type of mine being targeted: the SLQ-48 MNV for deep bottom mines, O-type mechanical sweep gear for shallow moored mines, and acoustic and magnetic detonators for acoustic and magnetic mines.

The SQQ sonar is mostly operated in the hull-mounted position. It is not towed while any of the sweeping gear is deployed. The MNV is usually deployed by itself. However, because it is controlled and can remain clear of streamed gear whenever it must be deployed, it can be deployed with any of the other gear. 6 

### Although they may be streamed together, the O-type and magneticacoustic gear are usually streamed individually. The O-type gear fans out when streamed (see Figure 2), while the magnetic-acoustic gear streams directly astern in the absence of current. The only chance for interference between O-type and magnetic-acoustic gear, when streamed together, is during ship’s turns, which must be wide and slow.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Discharges from mine countermeasures equipment incidental to normal operations occur only during training exercises usually held between five and 12 n. m. from shore, and sometimes as far as 20 to 50 n. m. from shore. 8

### Mine Countermeasures Equipment Lubrication 5 3.2 Rate
This discharge is not a flow; rather, it is the release of lubricant to the surrounding seawater by mechanical erosion or dissolution when equipment is towed. During training exercises, the conventional mine countermeasures equipment is deployed and towed behind the ship as it sweeps the area. 2 

### Based on information from the Naval Undersea Warfare Center and on planned maintenance system (PMS) requirements, small amounts of lubricants are applied to various parts of the towed equipment. 2,9 

### Thus, there is a potential for these lubricants to be released to the surrounding waters.
Due to differences in equipment and mission assignments between the two vessel classes, the discharges produced by the MHC 51 and MCM 1 Class vessels are different. For this reason, the two vessel classes are discussed individually, and producing the greatest discharge scenarios are developed for each vessel class. Calculations are based on all mine countermeasures vessels operating in U.S. waters (i.e., none are under repair or deployed overseas).

3.2.1 MHC 51 Class Vessels
An MHC 51 Class vessel averages about five training days per month, with a maximum of four two-hour exercises each training day. 10 

### Thus, for a given ship, the total number of exercises per year is equal to:

(5 days/month)(4 exercises/day)(12 months/year) = 240 exercises per year for each ship

For the nine existing MHC 51 Class vessels (Section 2.3), this is a total of 2,160 exercises per year.
MHC 51 Class vessels are equipped with SQQ-32 sonar and the SLQ-48 MNV. The sonar has no lubricated areas exposed to seawater during operation and, as discussed in Section 2.2, tow cables are not greased. Therefore, there is no potential for grease being released during SQQ sonar deployment.

The SLQ-48 MNV has two arms which are controlled by a remote operator, or “pilot”, to do work. Each arm has a cavity which receives approximately 2 ounces of DOD-G-24508 grease to prevent equipment binding. 11 

### A conservative assumption, however, is that all of the grease in the cavities is washed out during deployment (i.e., 4 ounces per deployment).
The lifting cable used for deploying the SLQ-48 MNV is lubricated with approximately 3 ounces of MIL-G-18458 grease. This cable is in contact with the water only during the vehicle's launching and recovery, during which time the vessel is stationary. Equipment experts estimate that during deployment this cable is in the water less than 1 minute, and during recovery for 3 to 5 minutes. 12 

### Therefore, the total amount of time the lift cable is in contact with seawater is approximately 5 minutes during each exercise.
The specification for the lift cable grease requires conformance with several chemical and

### Mine Countermeasures Equipment Lubrication 6 physical standards, one of which is an adhesion test. In this test, grease is applied to a concave disk of known weight. The greased disk is then weighed to determine the weight of grease applied. The disk is submerged in 151 ° F water for 15 minutes, and then rotated at approximately 150 revolutions per minute for an additional 15 minutes. The disk is then weighed to determine the quantity of grease which has either eroded or dissolved. To pass this test, a minimum of 95% of the applied grease must remain on the disk as determined by the final weight of the disk after the test. 13



### For the deployment of the SLQ-48 MNV, the grease on the lift cable is exposed to comparatively milder conditions. The water temperature will be lower, the exposure time will be less, and because the vessel is stationary, there will be little or no mechanical erosion. The maximum estimate of the grease discharged from the lift cable is 5 percent of the applied grease. This would be equal to 0.15 ounces of grease discharged per deployment.

3.2.2 MCM 1 Class Vessels

MCM 1 Class v essel training exercises consist either of a sweeping or a hunting task, and the dimensions of the exercise area vary with each exercise. For example, an assigned area may measure as much as 30 by 90 miles. Each MCM is assigned one sweeping and one hunting task each month. Thus, as a conservative estimate, each MCM on average deploys various combinations of its countermeasures equipment 24 times a year, and performs each type of operation 12 times per year. Unless some problem is experienced with the equipment while deployed, it remains in the water for the duration of the exercise, which may last 24 hours a day for up to 5 days. 10,11



### For minehunting, the MCM Class 1 vessels use the same equipment as the MHC 51 Class vessels; the SQQ sonar and the SLQ-48 MNV. However, the MCMs use non-greased nylon lifting cables when launching and recovering the SLQ-48 MNV, so no potential exists for the release of cable grease to the surrounding water. 12



### The MCM mine neutralization vehicle hoist arrangement provides three weight-bearing cables to handle the 2,750 pound vehicle. This allows nylon cables to handle the load. The crane of the MHC 51 Class vessel attaches to the vehicle with only a single cable, which precludes the use of a nylon cable.

Neither the S QQ-30 nor the SQQ-32 sonar expose lubricants to the surrounding seawater. As noted previously, the largest discharge is a four ounce discharge of DOD-G-24508 grease from the arms of the SLQ-48 MNV during each of the 12 exercises conducted annually.

For minesweeping operations, either O-type gear is deployed, or magnetic and acoustic detonators are deployed. For the 12 sweeping exercises conducted annually, operational experience shows that O-type gear is deployed half of the time (six out of 12) and magnetic and acoustic detonators are deployed half of the time (six out of 12). In an O-type gear double sweep array, there are cables, chains, and wires, which are not lubricated. In addition, there are eight cutters, two snatch blocks, three shackles, and 13 swivels that are lubricated. The swivels have fittings through

### Mine Countermeasures Equipment Lubrication 7 which MIL-G-23549 grease is applied; each swivel is then wiped clean. Only the threads of theshackles are greased. The bearing surfaces of the snatch block rollers are given a light coat of MILL-3150 oil. Since the bearing surfaces are recessed within the block, they are minimally exposed to seawater turbulence while being towed. The cutters are fabricated of a non-ferrous alloy. When retrieved, they are washed with freshwater, dried, and given a light coat of MIL-L-9000 oil before being stowed. No additional lubrication is applied before they are re-deployed. 14



### An estimate of the amount of lubricant (combined oil and grease) that is discharged is 1 ounce for each component, or 26 ounces during each of the six exercises using O-type gear.

8 cutters + 2 snatch blocks + 3 shackles + 13 swivels = 26 components total

For the six magnetic and acoustic exercises conducted each year, the MCM streams the magnetic minesweeping cable and either a high frequency A-MK4-V or a low frequency A-MK6-B acoustic detonator. 6 

### The only lubricant exposed to the turbulence of the seawater while streaming the magnetic and acoustic detonators is on the 30-inch diaphragm of the A-MK4-V detonator, which is coated with about 4 ounces of DOD-G-24508 grease. 8,15 

### The A=-MK6-B low frequency detonator does not have a diaphragm that requires grease. The magnetic minesweeping cable and the power cable to the acoustic detonators are buoyant; however, the streamed acoustic detonator does require a large O-type float in order to stream properly. A wire pendant of the desired length secures each acoustic detonator to its large float by a swivel whose zerk fitting has about 1 ounce of MIL-G-23549 grease pumped into it. 10 

### Therefore, when a high frequency acoustic detonator is streamed with the magnetic minesweeping cable, approximately five ounces of grease (four from the diaphragm and one from the swivel) are exposed to the sea. When the low frequency acoustic detonator is used, the amount of grease that could be released is one ounce (from the detonator’s swivel to its buoy float).

3.3 Constituents
Several types of lubrication oils and greases are used on wetted mine countermeasures equipment based on information in maintenance requirements cards. Table 2 shows a list of the lubricant types and the lubrication schedules for the mine countermeasures equipment. 9 

### The greases are made from lubricating stocks generated during petroleum fractionation. These fractions contain organic compounds each generally having more than seventeen carbon atoms. Lubricating oils are composed of aliphatic, olefinic, naphthenic (cycloparaffinic), and aromatic hydrocarbons depending on their specific use. Lubricating oil additives include antioxidants, bearing protectors, wear resistors, dispersants, detergents, viscosity index improvers, pourpoint depressors, and antifoaming and rust-resisting agents. 16



### Until recently, lead was contained in the MIL-G-18458B grease procured by the N avy to lubricate the MHC’s lift cable which deploys and recovers the SLQ-48 MNV. However, Amendment 5 to MIL-G-18458B dated 26 March, 1996, prohibits heavy metals (including lead) and salts of heavy metals as constituents of MIL-G-18458B grease. 13 

### As such, the Navy is no longer procuring grease containing lead or any heavy metals for use in lubricating mine countermeasures equipment. Consequently, lead will not be considered a constituent of this

### Mine Countermeasures Equipment Lubrication 8 discharge.

There are no known bioaccumulators in this di scharge.

3.4 Concentrations
Table 3a shows the percentages of the constituents in oils and greases used on the mine countermeasures wetted equipment. The total of the base constituents of oils and greases (i.e., the hydrocarbons -- mineral oils through the asphalts and waxes (e.g., the heavy paraffinic distillates)) range in concentration from approximately 25% to greater than 90%, with additives making up the balance of these lubricants. Tables 3b through 3d show the maximum concentrations from SLQ-48 arms, O-gear and cutters, and acoustic and magnetic devices, respectively.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality standards. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
The estimated annual lubricant mass loading shown in Table 4 is based upon the discharge scenarios described in Section 3.2, the number of exercises performed annually, and the number of vessels involved.

4.2 Environmental Concentrations
The estimated quantities of lubricant released to the environment during each mine countermeasures training exercise are shown in Table 4. The concentration after dilution in the environment can be estimated using the mass loadings from Table 4 and estimates of the volumes of water through which the equipment is towed during various exercises. These estimates are provided in Sections 4.2.1 through 4.2.4 for each of the source/vessel combinations identified in Section 3.2 and Table 4. Section 4.2.5 provides information on applicable water quality standards.

4.2.1 SLQ-48 MNV Arms

As shown in Table 4 and discussed in Section 3.2, the estimated maximum amount of grease discharged from the SLQ-48 MNV is 4 ounces (0.25 pounds (lbs)). This assumes that the screws that seal both cavities come unscrewed and fallout undetected, allowing all of the applied grease to be released. While this is based on equipment failure and does not reflect typical

### Mine Countermeasures Equipment Lubrication 9 operating conditions, it does provide a conservative assumption regarding the amount of grease released during operations.
For MHC 51 Class vessels, minehunting operations are performed at a speed of 5 knots (30,381 feet per hour (ft/hr)) for a duration of 2 hours. 14 

### The calculated concentration of lubricant in the environment from SLQ-48 MNV arms assumed that:

• the SLQ 48 MNV creates a nine square feet (three feet by three feet) area of turbulence in the wake of the vehicle, as determined by dimensions of the vehicle’s cross-sectional
area;

• the discharge rate of grease is uniform throughout the exercise;

• the grease is uniformly dispersed throughout the traversed water volume
Based upon operational experience, it was determined that the SLQ-48 MNV generates a wake in the same manner as a surfaced submarine. Thus the frontal area of the vehicle, as determined by the dimensions of its cross-sectional area, creates a ninesquare feet (three feet by three feet) area of turbulence 17 

### where complete mixing occurs. Therefore, an area of nine square feet was used in the following formula to calculate the mixing and dispersion of oil and grease caused by the turbulence of the vehicle’s wake rather than the frontal area of the arms.

The volume of water

through which the equipment operates during a single exercise was calculated using the following formula:

Based on the assumptions l isted above and the volume of water through which the equipment operates, the lubricant concentration in the environment was estimated as follows:

The calculated value of 7.3 μ g/L is three orders of magnitude less than the most stringent state water quality criteria of 5,000 μ g/L (Florida).

4.2.2 SLQ-48 MNV Lift Cable
From Table 4 and the discussion in Section 3.2.1, the maximum amount of grease released from the lift cable during each deployment of the SLQ-48 MNV is 0.15 ounce (0.0094 Volume = (Area)(Time)(Speed) Volume = (9 square feet)(2 hours)(30,381 ft/hr) Volume = 546,858 cubic feet (ft 3 

### ) of water

Mass lubricant = (0.25 lbs lubricant)(453.6 grams (g)/lb)(1000 milligrams/g)

= 113,400 milligrams (mg) l ubricant Volume of water = (546,858 ft 3 

### )(28.32 liters (L)/ft 3 

### ) = 15,487,019 L Concentration = 113,400 mg lubricant/15,487,019 L

= 0.0073 mg/L, or 7.3 micrograms per liter ( μ g/L)

### Mine Countermeasures Equipment Lubrication 10 lbs). The grease would be released to the water in the immediate vicinity of the lift cable during deployment/retrieval of the SLQ-48 MNV since the vessel is stationary. The potential for environmental impact from this operation was estimated by determining the volume of water into which the grease would have to be dispersed to attain a concentration equal to the most stringent state water quality criteria: Florida’s criteria of 5,000 μ g/L, or 5 mg/L.
The calculated volume req uired for dilution of lubricant in the environment from the SLQ-48 MNV lift cable was based on the following assumptions:

• the top of the vehicle is covered by one foot of water during launching;

• the grease released is directly above the vehicle; and

• the lubricant disperses only in the horizontal plane; that is, the body of the vehicle prevents vertical dispersion
Based on these assumptions, the distance from the source beyond which the concentration is less than the most stringent water criteria (Florida), was estimated as follows:

At a distance of approximately 3 feet beyond the lifting cable, the concentration of the grease is less than the most stringent water quality criteria.

4.2.3 O-type Mechanical Gear

From Table 4 and the discussion in Section 3.2, th e maximum amount of lubricant released from O-type mechanical gear is 26 ounces (1.63 lbs). Each lubricated component (26 total components) of the O-type gear is a separate discharge point, has a cross-section of 48 in 2 

### (0.33 ft 2 

### ), and sweeps a volume of water equal to its cross-section multiplied by the distance towed through the water at seven knots. Operations with O-type gear deployed are limited to speeds of 7 to 8 knots (42,533 to 48,609 ft/hr). 14



### The equipment may remain deployed for several days (Section 3.2). Thus, the lubricantsthat are released from the equipment to the environment during minesweeping exercises with Otype mechanical gear will be dispersed over several miles.

An estimate of the concentration of lubricant in the environme nt was made based on the following assumptions:

• the equipment is deployed for 1 day; or 24 hours

• the rate of lubricant discharge is uniform throughout the exercise;

• the lubricant is uniformly dispersed throughout the traversed water volume 1) (0.0094 lbs grease)(453.6 g/lb) = 4.3 g; equal to 4300 mg grease 2) 4300 mg ÷ (Vol.) = 5.0 mg/L; Vol. = 860 L required 3) (860 L)(1 ft 3 

### /28.32 L) = 30.36 ft 3 

### 4) 30.36 ft 3 

### = (1 ft)( π )(r 2 

### ); rearranging and solving for r, r = 3.1 feet

### Mine Countermeasures Equipment Lubrication 11 At 7 kn ots (42,533 feet per hour), the volume of water swept by the equipment during the training exercise was estimated as follows:

Volume = (# of components)(Cross-sectional area of each component)(Time)(Speed)

Volume = (26)(0.33 square feet)(24 hours)(42,533 ft/hr) Volume = 8.76 x 10 6 

### cubic feet (ft 3 

### ) of water

Based on the assumptions listed above and the volume of water through which the equipment is towed, the lubricant concentration in the environment was estimated as follows:

This concentration is three orders of magnitude less than Florida’s discharge standard of 5,000 μ g/L and is based on the conservative assumption that the equipment is in the water for only 24 hours.

4.2.4 Acoustic and Magnetic Mine Detonators

From Table 4 and the discussion in Section 3.2, the maximum amount of lubricant released from acoustic and magnetic mine detonation devices is five ounces (0.3125 pound). Operations are usually performed at speeds of 7 to 8 knots (42,533 to 48,609 ft/hr). 14 

### As with the O-type mechanical gear, the equipment may remain deployed for several days. Thus, any lubricant removed from the equipment will be dispersed into a large volume of water.
An estimated lubricant concentration was made based on the following assumptions:

• the equipment is deployed for 1 day; or 24 hours

• the rate of lubricant discharge is uniform throughout the exercise;

• the lubricant is uniformly dispersed throughout the traversed water volume;

• the acoustic device has a frontal area equivalent to a 36-inch diameter disk (7.07 square feet) (this assumption is based on allowing space for the housing around Mass lubricant = (1.625 l bs lubricant)(453.6 g/lb)(1000 mg/g)

= 737,100 mg lubricant Volume of water = (8.76 x 10 6 

### ft 3 

### )(28.32 L/ft 3 

### ) = 2.48 x 10 8 

### L Concentration = 737,100 mg/2.48 x 10 8 

### L

= 2.97 x 10 -3 

### mg/L; or 2.97 μ g/L in a 24-hour period

Volume = (Number of components)(Cross-sectional area of each

component)(Time)(Speed) Volume = (26 components)(0.33 ft)(24 hours)(42,533 ft/hr)

Volume = 8.76 x 10 6 

### ft 3 

### of water

### Mine Countermeasures Equipment Lubrication 12 the acoustic device), plus a 2- by 4-inch (0.055 ft 2 

### ) swivel.
At 7 knots (42,533 ft/hr), the volume of water swept by the equipment during the training exercise was estimated as follows:

Based on the assumptions listed above and the volume of water through which the equipment is towed, the lubricant concentration in the environment was estimated as follows:

This estimated concentration of 0.688 μ g/L is three orders of magnitude below the most stringent water quality criteria.

4.2.5 Water Quality Criteria and Discharge Standards
Table 5 shows water quality criteria and discharge standards that are relevant to the mine countermeasures equipment lubrication discharge and the estimated environmental concentrations of the constituents of the discharge.

4.3 Potential for Introducing Non-indigenous Species
Mine countermeasures operations do not result in water being transported from one geographical region to another. Any non-indigenous species which may become attached to countermeasures equipment while deployed are removed during equipment retrieval operations or subsequent preventive maintenance activities. For example, automatic cable layers remove virtually all of the water from the cable(s) as they are retrieved, and maintenance procedures require freshwater washdowns of the retrieved equipment such as cutters and swivels. Further, it is unlikely that any attached aquatic species would survive while the countermeasures equipment is stored on deck. Therefore, there is no significant potential for transporting non-indigenous species.

5.0 CONCLUSIONS
Mine countermeasures equipment lubrication discharge has little potential for causing Volume = (Area)(Time)(Speed) Volume = (7.07 + 0.055 square feet)(24 hours)(42,533 ft/hr)

Volume = 7.27 x 10 6 

### ft 3 

### of water

Mass lubricant = (0. 3125 lbs lubricant)(453.6 g/lb)(1000 mg/g)

= 141,750 mg lubricant Volume of water = (7.27 x 10 6 

### ft 3 

### )(28.32 L/ft 3 

### ) = 205,886,400 L Concentration = 141,750 mg/205,886,400 L

= 6.88 x 10 -4 

### mg/L; or 0.688 μ g/L

### Mine Countermeasures Equipment Lubrication 13 adverse environmental effects because the small amounts of lubricants that are released disperse into very large volumes of water. The resulting concentrations are below the most stringent water quality criteria.
Further, most discharges from mine countermeas ures equipment occur beyond 5 n.m. from shore in high-energy waters (i.e., those with significant wave energy to rapidly and widely disperse releases) and are unlikely to affect more sensitive coastal environments.

This conclusion is based on estimated environmental concentrations of lubricants resulting from each of the mine countermeasures operations. For each operation, the estimated concentration was below the most stringent water quality criteria. Estimates were based on either the volume of water through which mine countermeasures equipment operates, or the volume required to dilute the discharge to levels below the most stringent water quality criteria.
Finally, for mine countermeasures operations there is no potential for transporting nonindigenous species.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained, reviewed, and analyzed. Process information and assumptions were used to estimate the rates of discharge

. Based on these estimates, the concentrations of lubricants in the environment resulting from this discharge were then estimated. Table 6 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes - Mine Counter measures Equipment Lubrication. 5 September 1996.

2. BM2 Hamilton , USS Champion (MCM 4), Information on Oil and Grease Lubrication Procedures, 23 July 1997, Jim O’Keefe, MR&S.

3. CDR Burdon, OPNAV Mine Warfare Branch (N852), Information on Mine Countermeasure Training Areas and Operations, 6 August 1997, Jim O’Keefe, MR&S.

4. UNDS Round 2 Equipment Expert Meeting Minutes, Mine Countermeasures Equipment Lubrication, 6 March 1997.

5. LCDR Sentlinger, XO on an MCM 1 Class Ship Based in Ingleside, TX, Info rmation on Lubrication Procedures, 19 March 1997, Sanjay Chandra, Versar Inc.

6. LCDR Shaun Gillilland, OPNAV, Mine Warfare Branch, Information on SQQ Sonars and Acoustic Detonator Operations, 20 January 1999, Jim O’Keefe, MR&S.

### Mine Countermeasures Equipment Lubrication 14 7. Polmar, Norman. The Naval Institute Guide to the Ships and Aircraft of the U.S. Fleet, 16th ed., Naval Institute Press, 1997, Chapter 22.

8. Andy Tatem, Naval Undersea Warfare Center, Panama City, FL, Information on Oil and Grease Lubrication Procedures, 24 July 1997, Jim O’Keefe, MR&S.

9. Maintenance Requirements Cards (MRCs) for Minesweeping Systems 4761.

a. MRC Control No. 47 8GGD N - Clean, inspect, and lubricate snatch blocks. b. MRC Control No. 47 8GGE N - Clean, inspect, and lubricate swivels.

c. MRC Control No. 47 8GGF N - Clean, inspect, and lubricate shackles. d. MRC Control No. 47 4MNR N - Inspect A Mk 4 (V) acoustic device diaphragm.

e. MRC Control No. 86 2WTT N - Clean cutter assembly. f. MRC Control No. 86 2WTR N - Clean, inspect, and lubricate cutter. g. MRC Control No. 86 2WTQ N - Clean and inspect cutter assembly.

10. STG1 Kelly, Fleet Liaison Office, Naval Surface Warfare Center (NSWC), Coastal Systems Station, Panama City, Florida, Information on Oil and Grease Lubrication Procedures, 12 August 1997, Jim O’Keefe, MR&S.

11. William Coffman, NSWC, Coastal Systems Station, Panama City, Florida, Information on Mine Neutralization Vehicle, 12 August 1997, Jim O’Keefe, MR&S.

12. CDR Piper, OPNAV Mine Warfare Branch (N852), Information on Mine Neutralization Vehicle, 6 August 1997, Jim O’Keefe, MR&S.

13. Military Specification MIL-G-18458B; “Grease Wire Rope, and Exposed”; March 1981, Revision B, Amendment 5; and March 1996 Revision B.

14. STG1 Kelly, Fleet Liaison Office, NSWC, Coastal Systems Station, P anama City, Florida, Information on Oil and Grease Lubrication Procedures, 13 August 1997, Jim O’Keefe, MR&S.

15. Andy Tatem, NSWC, Coastal Systems Station, Panama City, Florida, Information on Oil and Grease Lubrication Procedures, 23 July 1997, Jim O’Keefe, MR&S.

16. Patty’s Industrial Hygiene and Toxicology, Volume IIB, 3rd. ed., John Wiley & Sons, 1981, pp. 3369, 3397.

17. Quang Tran, NAVSEA Equipment Expert, Information on Mine Neutralization Vehicle, 20 August 1997, George Heiner, Malcolm Pirnie Inc.

### Mine Countermeasures Equipment Lubrication 15 General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.

### Mine Countermeasures Equipment Lubrication 16 The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Mine Countermeasures Equipment Lubrication 17 Figure 1. Mine Countermeasures Equipment on Deck

### Mine Countermeasures Equipment Lubrication 18 Figure 2. Overview of “O”-Type Minesweeping Operations

Cutters Sweep Wire

Depressor Wire

1500 feet

Float

80 feet Profile View

Plan View

### Mine Countermeasures Equipment Lubrication 19 Table 1 . Vessels Producing Mine Countermeasures Equipment Lubrication Discharge

Ship Class Mission Number of Vessels MHC 51 (Osprey) Harbor and channel clearing; deep water coastal

minehunting 9

MCM 1 (Avenger) Non-conventional minesweeping and detonation 14

Table 2. Lubricant Type and Schedule for Wetted Mine Countermeasures Equipment

Component Applicable Ship Classes Lubricant Mil

Standard Lubrication Schedule

Cutters MCM 1 Class MIL-L-9000 After each use Snatch blocks MIL-L-3150 Prior to and after each use Swivels MIL-G-23549 Quarterly, and prior to and after each use Shackles MIL-G-23549 Quarterly, and prior to and after each use Towed acoustic device (diaphragm) DOD-G-24508 Quarterly, after each streaming, or as a result of a sound measuring test Multi-purpose crane lift wire for handling the SLQ-48 MNV MHC 51 Class MIL-G-18458B Annually, or as required

SLQ-48 MNV arms MHC 51 and MCM 1 Class DOD-G-24508 Prior to each use

*G = grease, L = lubrication oil

### Mine Countermeasures Equipment Lubrication 20 Table 3a. Percentage of Constituents of Military Specification Oils and Greases

Component MIL-G-18458B wire rope
grease a MIL-L-9000

engine oil DOD-G-24508

ball and roller bearing grease b DOD-G-24508

ball and roller bearing grease c MIL-G-23549

general purpose grease MIL-L-3150

general purpose lube oil
Base Constituents asphalt 25 hydrocarbons 45-50 mineral oil (unspecified) 80 25 30-60 polyalphaolefins 70-80 solvent refined, hydrotreated heavy paraffinic distillate 55-70

solvent refined, hydrotreated residual oil 20-30 51

Additives 1-naphthaleneamine, n-phenyl <24-hydroxy-3, 5-di-tertbutylphenylpropionic acid thioclycolate <1

benzenepropanoic acid, 3,5-bis(1,1- dimethyl)-4-hydrooxyoctadecyl ester <2 calcium acetate <5 <3 calcium phenate <15 calcium sulfonate 4 clay 5-10 <10 Lithium Soaps >54 p,p-dioctyldiphenlamine <2 pentaerythritol 1 polymers (unspecified) <1 sodium chromate, tetrahydrate <1 sodium nitrate <2 1 sodium phosphate, tribasic <1
Source: Ingredients/Identity Information section of lubricant-specific material safety data sheets from DoD Hazardous Materials Information System

a Amendment 5 to MIL-G-18458B, March 26, 1996, prohibits heavy metals (including lead) and salts of heavy metals as constituents of MIL-G-18458B grease. b As manufactured by Royal Lubricants Company Inc.

c As manufactured by Mobil Oil Company Inc.

### Mine Countermeasures Equipment Lubrication 21 Table 3b. Maximum Concentrations from SLQ-48 Arms

TOTAL RELEASE PER EXERCISE: 4 oz. GREASE RELEASED: DOD-G-24508 (100%) ESTIMATED TOTAL MAXIMUM CONCENTRATION: 7.3 μ g/L

Component DOD-G-24508 ball and roller bearing grease a DOD-G-24508 ball and roller bearing grease b Maximum Concentration ( μ g/L) Base Constituents mineral oil (unspecified) 80 5.8 polyalphaolefins 70-80 5.8 Additives 1-naphthaleneamine, n-phenyl <2 0.15 benzenepropanoic acid, 3,5-bis(1,1- dimethyl)-4-hydrooxyoctadecyl ester <2 0.15

calcium acetate <5 <3 0.37 clay 5-10 <10 0.73 p,p-dioctyldiphenlamine <2 0.15 pentaerythritol 1 0.07 sodium chromate, tetrahydrate <1 0.07 sodium nitrate <2 1 0.15 sodium phosphate, tribasic <1 0.07



### Table 3c. Maximum Concentrations from O-Gear and Cutters

TOTAL RELEASE PER EXERCISE: 26 oz. GREASE RELEASED: MIL-G-23549 (53.8%); MIL-L-3150 (7.7%); MIL-L-9000 (30.8%) ESTIMATED TOTAL MAXIMUM CONCENTRATION: 2.97 μ g/L

Component MIL-L-9000 engine oil MIL-G-23549

general purpose grease MIL-L-3150

general purpose lube oil Maximum

Concentration ( μ g/L) Base Constituents hydrocarbons 45-50 0.11 mineral oil (unspecified) 25 30-60 0.14 solvent refined, hydrotreated heavy paraffinic distillate 55-70 0.64

solvent refined, hydrotreated residual oil 20-30 51 1.09 Additives4-hydroxy-3, 5-di-tertbutylphenylpropionic acid thioclycolate <1 0.02

calcium phenate <15 0.14 calcium sulfonate 4 0.06

a As manufactured by Royal Lubricants Company Inc. b As manufactured by Mobil Oil Company Inc.

### Mine Countermeasures Equipment Lubrication 22 Table 3d. Maximum Concentrations from Acoustic and Magnetic Devices

TOTAL RELEASE PER EXERCISE: 6 oz. GREASE RELEASED: DOD-G-24508 (67%), MIL-G-23549 (33%) ESTIMATED TOTAL MAXIMUM CONCENTRATION: 0.688 μ g/L

Component DOD-G-24508 ball and roller bearing grease a DOD-G-24508

ball and roller bearing grease b MIL-G-23549

general purpose grease Maximum

Concentration ( μ g/L) Base Constituents mineral oil (unspecified) 80 25 0.425 Polyalphaolefins 70-80 0.369 solvent refined, hydrotreated residual oil 51 0.116 Additives 1-naphthaleneamine, n-phenyl <2 0.0094-hydroxy-3, 5-di-tertbutylphenylpropionic acid thioclycolate <1 0.002

benzenepropanoic acid, 3,5-bis(1,1- dimethyl)-4-hydrooxyoctadecyl ester <2 0.009

calcium acetate <5 <3 0.037 calcium sulfonate 4 0.009 clay 5-10 <10 0.092 p,p-dioctyldiphenlamine <2 0.009 pentaerythritol 1 0.005 sodium chromate, tetrahydrate <1 0.005 sodium nitrate <2 1 0.014 sodium phosphate, tribasic <1 0.005

a As manufactured by Royal Lubricants Company Inc. b As manufactured by Mobil Oil Company Inc.

### Mine Countermeasures Equipment Lubrication 23 Table 4. Estimated Annual Lubricant Mass Loading

Source Quantity per

Exercise (oz) Yearly Number

of Exercises Number of

Vessels Total Release

(oz/yr) Total Release

(lbs/yr) MHC 51 Class SLQ-48 MNV arms 4 240 9 8,640 540 SLQ-48 MNV Lift Cable 0.15 240 9 324 20

MCM 1 Class SLQ-48 MNV arms 4 12 14 672 42 O-gear, cutters 26 6 14 2,184 137 Acoustic and Magnetic 5 6 14 420 26 Total Mass Loading 12,240 765



### Table 5. Water Quality Criteria and Discharge Standards

Source and Constituent Environmental

Concentration ( μ g/L) Federal Discharge

Standards ( μ g/L) Most Stringent State Acute Water Quality Criteria a ( μ g/L) SLQ-48 arms oil and grease 7.3 b Visible sheen * /15,000 ** 5,000 (FL) SLQ-48 MNV Lift Cable oil and grease 30 ft 3 c Visible sheen * /15,000 ** 5,000 (FL) O-gear, cutters oil and grease 2.97 Visible sheen * /15,000 ** 5,000 (FL) Acoustic and Magnetic oil and grease 0.688 Visible sheen * /15,000 ** 5,000 (FL) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995)
* Discharge of Oil. 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. ** International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS).

a FL = Florida b Estimated

c Volume required to disperse to most stringent water quality standard

### Mine Countermeasures Equipment Lubrication 24 Table 6. Data Sources

Data Source NOD report Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents PMS Cards X 3.4 Concentrations MSDS 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Motor Gasoline (MOGAS) Compensating Discharge 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Motor Gasoline (MOGAS) Compensating Discharge

### Motor Gasoline (MOGAS) Compensating Discharge 2 2.0 DISCHARGE DESCRIPTION
This section describes the MOGAS discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3). This discharge may be referred to as “Motor Gasoline (MOGAS) and Compensating Overboard

2.1 Equipment Description and Operation
MOGAS is commercial gasoline identical to that supplied to gas stations for automobile use. It is carried aboard certain Navy, U.S. Coast Guard (USCG), Military Sealift Command (MSC), and Army vessels as fuel for vehicles, special warfare operational craft, portable bomb hoists, crash saws, and any other gasoline-operated, ship-support equipment.
The USCG, MSC, Air Force, and Army have no vessels with fixed MOGAS storage. Most vehicles and equipment are brought aboard fully loaded with fuel, and additional MOGAS is carried in portable drums or containers. On some Navy vessels, additional MOGAS is stored for replenishment purposes in permanently installed seawater-compensated tanks as shown in Figure 1. Compensating seawater is supplied at a pressure sufficient to force gasoline to the suction side of the gasoline pumps, and keep the tank full to prevent potentially explosive gasoline vapors from forming. Several methods are used to supply seawater to the tanks. Aboard amphibious transport dock (LPD 4 Class) ships, two dedicated seawater pumps take suction directly from the sea chest. On amphibious assault (LHA 1 Class) ships, seawater can be supplied one of two ways: 1) a compensating tank with a capacity of 8,000 to 10,000 gallons of seawater is installed such that water drains by gravity to the fuel tank as necessary; or 2) booster pumps located in the pump room supply seawater to the fuel tanks.
Immediately before a major overhaul, and in accordance with existing management practices, ships with permanently installed seawater-compensated MOGAS tanks will unload any remaining fuel to tanker trucks on the pier and transit out to beyond 50 nautical miles (n.m.). Using seawater pumps, the MOGAS tanks and system piping are flushed with three tank volumes of seawater. Air pressure is used to force the seawater out of the tank, after which steam is used to clean the tank and “cook-off” any remaining fuel remnants. The MOGAS tanks are then filled with seawater and the ship returns to port for the overhaul.

After overhaul and before re-deployment (approximately once a year) the vessel receives MOGAS from pierside tanker trucks. MOGAS that is on-loaded displaces the compensating seawater in the tank, pushing it overboard. Several management practices are in place to ensure that MOGAS is not discharged overboard during refueling operations. Without these management practices, there is a potential to cause an oil sheen in the surrounding waters. First, the MOGAS tanks are filled to no more than 80% of capacity. 1 

### The amount of fuel needed is calculated before loading, and the tanker truck is only filled with a volume of MOGAS such that completely filling a MOGAS tank with the entire contents of the truck would not cause the tank to overflow. Additionally, watch personnel are stationed at strategic locations on and around the

### Motor Gasoline (MOGAS) Compensating Discharge 3 ship and pier to observe refueling operations and report any abnormalities. Containment devices are placed around all refueling hose connections to contain any fuel spills or leaks, and containment booms are placed in the water around the ship being refueled.
An additional management practice controls the rate at which MOGAS is supplied from the tanker trucks. Small-diameter hoses (usually two inches) are used to deliver fuel at a flow rate of 50 gallons per minute (gpm) or less, that, in conjunction with diffusers built into the tank filling system piping, reduces turbulence and minimizes mixing of gasoline and seawater.

2.2 Releases to the Environment
The discharge consists of seawater used to replac e, or compensate for, the space created in MOGAS tanks as the fuel is consumed. This seawater is discharged overboard as the MOGAS tank is refilled with gasoline. It is possible that this compensating seawater discharge overboard could contain traces of dissolved gasoline constituents.

2.3 Vessels Producing the Discharge
The USCG, MSC, Air Force, and Army have no vessels with fixed MOGAS storage, and therefore do not contribute to this discharge. 2,3,4 

### Eight LPD 4 Class, and five LHA 1 Class ships currently have installed MOGAS storage tanks that discharge compensating water during refueling. One LPD and one LHA Class ship are homeported overseas.
The most significant difference between LPD 4 and LHA 1 Class ships is MOGAS capacity. LPDs have a capacity to carry 26,000 gallons of MOGAS. LHAs have a capacity to carry 11,400 gallons of MOGAS.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Refueling always takes place pierside, and compensating seawater is discharged directly overboard as oncoming fuel displaces the seawater.

3.2 Rate
Tanker trucks with small diameter hoses (usually two inches) are used to deliver MOGAS to ships. The fill rate from these trucks is normally limited to 50 gpm or less. With the MOGAS tanks always full of seawater and fuel, compensating water is displaced directly overboard at the

### Motor Gasoline (MOGAS) Compensating Discharge 4 same rate as the incoming fuel.
The estimated amounts of compensating seawater discharged annually from ships with MOGAS storage tanks are presented in Table 1. The values in Table 1 are based on the operational experience of one refueling per ship per year, with a maximum of 80% of the tank capacity being displaced overboard by onloaded fuel. 1



### 3.3 Constituents
MOGAS is a hydrocarbon based unleaded fuel containing over 150 individual compounds. The types of compounds found in gasoline include alkanes, alkenes, aromatics, metals, and additives. Most of these compounds are a very small fraction (less than 2%) of gasoline. The compounds that individually comprise at least 2% of gasoline include butane, pentane, hexane, isopentane, methylpentane, dimethylpentane, trimethylpentane, trimethylhexane, benzene, toluene, xylene, methyl-3-ethylbenzene, trimethylbenzene, and ethylbenzene. The exact composition of gasoline is unknown because gasoline manufacturers constantly adjust their product to meet performance, emissions, and cost demands. 5 

### Due to the variable composition and the different water solubilities of the individual components of gasoline, it is difficult to determine the solubility of MOGAS.
To identify the constituents in this discharge, two studies that determined the water soluble components of gasoline, as well as their solubilities, were used. The first study was conducted by the Naval Biosciences Laboratory in 1983, and the second was conducted in 1992 for a workshop on petroleum hydrocarbons. 5,6 

### Both studies measured the water soluble constituents of gasoline by placing gasoline on top of water, agitating the water, allowing equilibrium to be established, and analyzing the water through gas chromatography. In these analyses, a water fuel interface was established very similar to the interface within MOGAS tanks. In both cases, the water was removed from the bottom of the container to be analyzed, ensuring that emulsified fuel was not being measured. Since gasoline composition has changed over the years, the study performed in 1992 is considered to be more representative of current MOGAS constituents. The constituents identified in this study that are soluble in water are listed in Table 2. 5 

### Benzene, toluene, ethylbenzene, phenol, and naphthalene are priority pollutants. None of these compounds are bioaccumulators.

3.4 Concentrations
The concentrations of the water soluble gasoline constituents in the MOGAS compensating discharge are estimated from the studies performed to determine the solubility of gasoline components in water. The 1983 study reported a range of constituent concentrations based on the source of the gasoline. Benzene concentrations ranged from 19.1 to 42.5 milligrams per liter (mg/L), toluene from 17.3 to 61.4 mg/L, and xylenes from 9.5 to 27.7 mg/L. 6 

### The 1992 study provided a more detailed account of the concentrations, which all fell within the ranges reported in the 1983 study. 5 

### The estimated concentrations of MOGAS components present in the compensating overboard discharge are shown in Table 2.

### Motor Gasoline (MOGAS) Compensating Discharge 5 4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituentsare compared with the water quality criteria. In Section 4.3, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Using the fleet wide MOGAS compensating water annual discharge volumes presented in Table 1, and the estimated constituent concentrations in Table 2, the total mass loadings for the priority pollutants present in this discharge were calculated using the following formula:

Mass Loading (lbs/yr) = (Concentration (mg/L))(Volume (gal/yr))(3.785 L/gal)(2.2 lbs/kg)(10 -6 

### kg/mg)

Table 3 provides the resulting mass loadings on a maximum discharge per event basis and on a total annual fleetwide basis.

4.2 Environmental Concentrations

As identified in Section 3.3, the constituents of concern are benzene, toluene, ethylbenzene, xylene isomers, phenol, and naphthalene. The estimated constituent concentrations in MOGAS compensating water discharges, and the corresponding most stringent state water quality criteria (WQC), are presented in Table 4. Benzene, toluene, ethylbenzene, phenol, and naphthalene concentrations exceed the most stringent state WQC. There are no relevant Federal or state WQC for xylene isomers.

4.3 Potential for Introducing Non-Indigenous Species
In those instances where vessels receive MOGAS prior to deployment and no overhaul period is pending, the possibility of non-indigenous species transport exists. Water from different ports could have entered the tanks during the previous deployment to compensate for consumed fuel. When shipboard MOGAS tanks are emptied of fuel, flushed, steam-cleaned, and then filled with seawater while in deep water before returning to port for overhaul, there is no significant possibility of non-indigenous species transport. Therefore, depending on the operational procedures and the deployment of the vessels, there may be a potential for the transfer of non-indigenous species.

5.0 CONCLUSIONS
MOGAS compensating discharge has the potential to cause an adverse environmental

### Motor Gasoline (MOGAS) Compensating Discharge 6 effect because there is a potential to cause an oil sheen in the waters surrounding the ship. Additionally, the possibility exists for the transfer of non-indigenous species, depending on the operational procedures of a particular vessel and the deployment schedule.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information was used to estimate the volume of discharge. Table 5 shows the source of the data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes. Motor Gasoline (MOGAS) Storage and Compensated Overboard Discharge. October 23, 1996.

2. Personal Communication Between LT Joyce Aivalotis (U.S. Coast Guard) and David Ciscon (M. Rosenblatt & Son). May 28, 1997.

3. Personal Communication Between Penny Weersing (Military Sealift Command Central Technical Activity) and Don Kim (M. Rosenblatt & Son). October 24, 1996.

4. US Army Input to Equipment Expert Meeting, Motor Gasoline (MOGAS ) Storage and Compensated Overboard Discharge. February 7, 1997.

5. Bruya, James E., Petroleum Hydrocarbons: What are they? How much is present? Where do they go? Friedman & Bruya, Inc., Seattle, WA. April 1992.

6. Guard, Harold E. and Roy B. Laughlin, Jr., Characterization of Gasolines, Diesel Fuels & Their Water Soluble Fractions. Naval Biosciences Laboratory, Oakland, CA., September 1983.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic

### Motor Gasoline (MOGAS) Compensating Discharge 7 Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Motor Gasoline (MOGAS) Compensating Discharge 8 FIGURE 1 SEAWATER COMPENSATED

MOGAS STOWAGE TANK GASOLINE LINE

SEA CHEST COFFERDAM

GASOLINE SEAWATER LINES

SEAWATER OUTER TANK GASOLINE DRAIN OFF TANK

### Motor Gasoline (MOGAS) Compensating Discharge 9 Table 1. Estimated Total Amounts of MOGAS Compensating Seawater Displaced

Overboard Annually by Vessel Class in U.S. Ports

Vessel Class No. of Vessels in U.S. MOGAS Tank

Capacity Per Vessel (gal) Total Tank

Capacity (gal) Volume of Compensating

Seawater Discharged Overboard Per Year a 

### LPD 7 26,000 182,000 145,600 LHA 4 11,400 45,600 36,480 Estimated Total: 182,080

a Based on one complete in-port refueling per year per vessel, and a maximum of 80% of the tank capacity being displaced overboard by onloaded fuel



### Table 2. Estimated Constituent Concentrations in MOGAS Compensating Overboard Discharge 5



### Compound Concentration (mg/L) Methyl-t-butyl ether (MTBE) 116 Benzene 29.5 Toluene 42.6 Xylene Isomers (3) 14.7 Ethylbenzene 2.4 C 5 

### and C 6 

### Alkenes and Alkadienes 0.5 C 1 

### to C 4 

### Phenols 1.2 C 3 

### to C 5 

### Benzenes 6.8 C 0 

### to C 3 

### Anilines 3.7 C 0 

### to C 2 

### Thiophenes 1.3 C 0 

### to C 2 

### Indanes and Indenes 1.2 C 0 

### to C 2 

### Naphthalenes 1.2 C 0 

### to C 2 

### Pyridines 0.4 C 0 

### to C 2 

### Indoles 0.3

### Motor Gasoline (MOGAS) Compensating Discharge 10 Table 3. Estimated Annual Mass Loadings

Constituent Estimated

Concentration In Discharge (mg/L) Maximum Discharge

Event Mass Loading* (lbs) Total Fleetwide

Mass Loading** (lbs)

Benzene 29.5 5.1 45 Toluene 42.6 7.4 65 Xylene Isomers (3) 14.7 2.5 22 Ethylbenzene 2.4 0.4 4 Phenols 1.2 0.2 2 Naphthalenes 1.2 0.2 2 * Based upon a maximum discharge event volume of 20,800 gallons from an LPD 7 (assuming a maximum of 80% of the 26,000 gallon tank capacity being displaced overboard by onloaded fuel) ** Based upon a total annual discharge volume of 182,080 gallons



### Table 4. Comparison of Estimated Discharge Concentrations with Water Quality Criteria

Constituent Concentration

(mg/L) Federal Acute

WQC (mg/L) Most Stringent State Acute WQC (mg/L) Benzene 29.5 None 0.07128 (FL) Toluene 42.6 None 2.1 (HI) Ethylbenzene 2.4 None 0.14 (HI) Phenols 1.2 None 0.17 (HI) Naphthalenes 1.2 None 0.78 (HI)
Notes: Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

FL = Florida HI = Hawaii

### Motor Gasoline (MOGAS) Compensating Discharge 11 Table 5. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X X 3.2 Rate X X 3.3 Constituents X X X 3.4 Concentrations X X X 4.1 Mass Loadings X X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X

### Non-oily Machinery Wastewater 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Non-oily Machinery Wastewater

### Non-oily Machinery Wastewater 2 2.0 DISCHARGE DESCRIPTION
This section describes the non-oily machinery wastewater and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
The primary purpose of the non-oily machinery wastewater system is to segregate machinery wastewater from the wastes that collect in bilges so that non-oily machinery wastewater can be directly discharged overboard. This reduces the amount of bilgewater that needs to be treated with oil water separators ( OWS) prior to discharge. Dedicated drip pans,funnels, and deck drains comprise the non-oily machinery wastewater system and collect nonoily machinery wastewater that is generated below the ship’s waterline in machinery spaces. Non-oily machinery wastewater from systems and equipment located above a ship’s waterline is often drained directly overboard. By separately collecting and preventing non-oily machinery wastewater from mixing with oily wastewater, non-oily wastewater is discharged without going through an OWS system.
For the systems below the waterline, non-oily machinery wastewater drains in to the nonoily machinery wastewater drain tanks (generally one per machinery space) which have dedicated pumps that discharge directly overboard. These pumps normally operate automatically under control of high- and low-level sensors. Non-oily machinery wastewater tanks range in size from 100 gallons for smaller ships to 2,500 gallons for aircraft carriers. Figure 1 is a diagram of a typical non-oily machinery wastewater system.
The main sources of water to the non-oily machinery wastewater are:

• distilling plants start-up discharge,

• bleed air system leaks,

• chilled water condensate drains,

• fresh and saltwater pump drains,

• potable water tank overflows,

• leaks from propulsion shaft seals, • low & high pressure air compressor condensate,

• leaks from valve stems and manifolds,

• seawater and freshwater relief valve leaks,

• leaks from pump packing gland seals,

• seawater duplex strainer leaks,

• propulsion engine jacket water cooler drains.

### Non-oily Machinery Wastewater 3In limited cases, steam condensate is combined with non-oily machinery wastewater in the nonoily machinery wastewater drain tank. The combined wastewater are discharged overboard below the waterline. Information on steam condensate is provided in the steam condensate NOD report.
Of these listed non-oily machinery wastewater sources, distilling plants may be the major source of non-oily machinery wastewater. Distilling plants desalinate seawater to produce potable, boiler feed, and equipment cooling water. The freshwater initially produced by the distilling plants during start-up is normally discharged either overboard or to the non-oily machinery wastewater system until acceptable specified salinity levels are achieved. This period normally lasts about 15 minutes, at which time the discharge is discontinued. Also, the quality of the water produced during the normal operation of the distiller plants may occasionally be unsatisfactory; this water is discharged in the same manner as during start-up.

2.2 Releases to the Environment
The constituents of this discharge include potable water and seawater, metals from contact with tanks and piping, and other constituents associated with the construction and operation of the non-oily machinery wastewater system and equipment served by the system. The discharge either drains directly overboard continuously as it is produced, or is pumped overboard intermittently from non-oily machinery wastewater tanks.

2.3 Vessels Producing the Discharge
Non-conventionally powered Navy surface vessels and all newly constructed and some older conventionally-powered vessels have dedicated non-oily machinery wastewater systems. Most Military Sealift Command vessels and some of the older conventionally powered Navy ships do not have a separate non-oily machinery wastewater system, so the non-oily wastewater drains to the bilge. 1 

### U.S. Coast Guard vessels and small boats and craft of the Armed Forces do not have any dedicated non-oily machinery wastewater collection systems; instead, the non-oily machinery wastewater, which is mixed with bilgewater, is generally collected for shore side treatment as bilgewater. In addition, Army and Air Force vessels do not have separate non-oily machinery wastewater systems; this type of wastewater is drained directly to the bilge.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
This discharge occurs in port, during transit, and at sea.

### Non-oily Machinery Wastewater 4 3.2 Rate
The generation rate and discharge frequency of n on-oily machinery wastewater varies considerably according to the mode of ship operation and its equipment operating status. This was demonstrated by the results of the recent flow characterization study of non-oily machinery wastewater onboard the following vessels: CVN 74, DDG 67, LHD 5, and LSD 44. 2 

### A cumulative discharge flow rate of 97,057,740 gallons/year was estimated for the vessel classes that these vessels represent. Non-oily machinery wastewater flow rates by vessel class were established by using the following formula:

Vessel Class Flow Rate = (# vessels/ship class)(flow rate)(# of days in port/ year)
CVN 68 Class = (7 vessels)(41,200 gal/day)(147 days in port/year) = 42,394,800 gal/year

Machine-specific non-oily machinery wastewater sou rces can generate volumes ranging from a few drips per minute in the case of small pumps and valves, to several thousand gallons per hour ( gph) in the case of distilling units releasing their output during plant start-up. The volume of distillate directed to the non-oily machinery wastewater system during start-up ranges from less than 100 gph to about 4,000 gph depending on the size of the plant.

3.3 Constituents
Non-oily machinery wastewater discharge samples were obtained from four Navy ships. Samples were collected aboard an aircraft carrier (CVN 74), an amphibious assault ship ( LHD 1), a dock landing ship (LSD 51) and a guided missile destroyer ( DDG 57). 3 

### See Table 1 for the concentrations of constituents detected in shipboard non-oily machinery wastewater discharge samples. Table 2 lists a bioaccumulator and constituents that were detected in the non-oily machinery wastewater samples at concentrations that exceed Federal and/or state ambient water quality criteria (WQC). The priority pollutants bis(2-ethylhexyl) phthalate, copper, nickel, silver, and zinc were identified as being present in concentrations exceeding WQC. The only bioaccumulator identified in the discharge was mercury.

3.4 Concentrations

Concentrations of constituents detected in non-oily machinery wastewater samples collected from an aircraft carrier (CVN 74), an amphibious assault ship ( LHD 1), a dock landing ship (LSD 51) and a guided missile destroyer ( DDG 57) are presented in Table 1. Concentrations of a known bioaccumulator and the constituents that exceeded Federal and/or most stringent state WQC are presented in Table 2.

### Non-oily Machinery Wastewater 5 4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The mass loadings and the concentrations of discharge constituents after release to the environment are discussed in Sections 4.1 and 4.2, respectively. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
Non-oily machinery wastewater discharge volumes (recorded by pump running time meters/event counters) were recorded daily aboard four ships from different ship classes over periods of time ranging from 22 to 29 consecutive days. 2 

### These were the same four ship classes that were sampled. The discharge flow data and log-normal mean concentrations were used to estimate mass loadings for those analytes detected. Mass loadings of all constituents detected are presented in Table 1. Table 2 shows mass loadings for constituents with log-normal mean concentrations that exceed water quality criteria and for the loan bioaccumulator detected, mercury. A sample calculation of the estimated mass loading for copper is shown below:

Mass Loading for Copper (Total): Mass Loading = (Log-normal mean concentration)(Flow Rate)

= (599.96 mg/L)(97,057,740 gal/ yr)(3.785 L/gal)(1kg/10 9 

### mg)(2.2 lb/1 kg) = 485 lbs/ yr

Mass loadings were determined using log-normal averages because the concentration data are expected to follow a log-normal distribution.

4.2 Environmental Concentrations
The log-normal mean discharge concentrations are compared to the Federal and most stringent state WQC in Table 3. Copper, nickel, silver, zinc, bis(2-ethylhexyl) phthalate, ammonia, nitrogen (as nitrate/nitrite and total kjeldahl nitrogen), and total phosphorous were present in shipboard non-oily machinery wastewater discharge samples, with log-normal mean concentration levels in excess of the most stringent established water quality criteria. Mercury was detected in two of four shipboard samples, but the log-normal mean concentration did not exceed WQC.

4.3 Potential for Introducing Non-Indigenous Species
The discharge from freshwater no n-oily machinery wastewater originates from the potable water system and therefore, cannot introduce, transport, or release non-indigenous species. Non-oily machinery wastewater of seawater origin is pumped overboard in the same geographical area in which the seawater was taken. Therefore, transporting aquatic species from one geographic area to another as a result of this discharge is unlikely.

### Non-oily Machinery Wastewater 6 5.0 CONCLUSION
It is not clear whether non-oily machinery wastewater has the potential to cause an adverse environmental effect. Copper, nickel, silver, zinc, bis(2-ethylhexyl) phthalate, ammonia, nitrogen, and phosphorous exceed federal or most stringent state water quality criteria. However, flow rate data are not adequate for estimating the fleetwide generation rate for this discharge, and consequently, the mass loadings of these constituents for the fleet could not be calculated.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information and assumptions were used to estimate the discharge volume

. Based on this estimate and on the reported concentrations of constituents, the mass loadings to the environment resulting from this discharge were then estimated. Table 4 shows the source of the data used to develop this NOD report.
Specific References

1. Point Paper, “Supplemental Information for Miscellaneous UNDS Discharge Streams”, P. Weersing, Military Sealift Command Central Technical Activity, Code N72PC1, January 9, 1997.

2. Un iform National Discharge Standards Non-Oily Machinery Wastewater ( NOMWW) Flow Characterization Report, CDNSWC-TM-63-98/62, March 1998.

3. UNDS Phase 1 Sampling Data Report, Volumes 1 - 13, October 1997.

General References

USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.

### Non-oily Machinery Wastewater 7 Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code ( VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code ( WAC).
UNDS Equipment Expert Meeting Minutes - Non-oily Machinery Wastewater. 12 September 1996.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.
UNDS Ship Database, August 1, 1997.
Pentagon Ship Movement Data for Years 1991-1995, Dated March 4, 1997.

### Non-oily Machinery Wastewater 8 FIGURE 1 TYPICAL NON-OILY MACHINERY WASTEWATER SYSTEM

NON-OILY MACHINERY
WASTEWATER TANK FUNNELS

PUMP FUNNELS

OVERFLOWS A / C

POTABLE WATER TANK DRIP PANS SHIP'S HULL SHIP'S HULL

CONDENSER DRAINS RELIEF VALVES

VALVE STEMS PUMP PACKING GLANDS

OVERBOARD HIGH/ON

LOW/OFF DISTILLER PLANT

### Non-oily Machinery Wastewater 9 Table 1. Summary of Detected Analytes

Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Mass Loading

CLASSICALS (mg/L) (mg/L) (mg/L) ( lbs/ yr) Alkalinity 13.96 4 of 4 6 62 11284 Ammonia as Nitrogen 0.34 4 of 4 0.1 1 275 Biochemical Oxygen Demand 4.76 1 of 3 BDL 12 3696 Chemical Oxygen Demand 63.89 3 of 4 BDL 285 49608 Chloride 94.29 4 of 4 2 3050 73213 Hexane Extractable Material 5.02 1 of 4 BDL 40.5 3898 Nitrate/Nitrite 0.38 4 of 4 0.19 0.56 295 SGT-HEM 5.91 1 of 3 BDL 33 4589 Sulfate 139.13 4 of 4 9.8 1710 112457 Total Dissolved Solids 431.32 4 of 4 46 6300 348630 Total Kjeldahl Nitrogen 1.05 4 of 4 0.55 2.3 8.49 Total Organic Carbon (TOC) 4.27 3 of 4 BDL 21 3451 Total Phosphorous 1.03 4 of 4 .14 11 833 Total Recoverable Oil and Grease 4.73 4 of 4 .6 19.75 3823

Total Sulfide ( Iodometric) 6.45 4 of 4 2 16 5213 Total Suspended Solids 11.34 3 of 4 BDL 46 9166 Volatile Residue 287.25 4 of 4 54 6350 232180 MERCURY ( ng/L) ( ng/L) ( ng/L) ( lbs/ yr) Mercury 4.48 2 of 4 BDL 2135 0.0036 METALS ( μ g/L) ( μ g/L) ( μ g/L) ( lbs/ yr) Aluminum Dissolved 30.83 1 of 4 BDL 68 24.92 Total 53.47 1 of 4 BDL 372.5 43.22 Antimony Dissolved 2.81 1 of 4 BDL 7.55 2.27 Total 2.57 1 of 4 BDL 5.5 2.08 Arsenic Dissolved 0.94 1 of 4 BDL 1.8 0.760 Total 0.57 1 of 4 BDL 1.2 0.461 Barium Dissolved 5.17 3 of 4 BDL 21.8 4.18 Total 7.03 3 of 4 BDL 34.95 5.68 Boron Dissolved 80.88 3 of 4 BDL 754 65.4 Total 89.19 3 of 4 BDL 833 72.1 Cadmium Dissolved 2.78 1 of 4 BDL 5.2 2.25 Total 2.80 1 of 4 BDL 5.4 2.26 Calcium Dissolved 3587.66 4 of 4 131.5 74650 2900 Total 4117.59 4 of 4 173 97950 3328 Copper Dissolved 148.76 4 of 4 34.35 1065 120 Total 599.96 4 of 4 34.2 3045 485

### Non-oily Machinery Wastewater 10 Iron Dissolved 20.90 2 of 4 BDL 89.15 16.9 Total 110.28 3 of 4 BDL 2505 89.1 Lead Dissolved 4.59 1 of 4 BDL 19.3 3.71 Total 5.10 1 of 4 BDL 29.35 4.12 Magnesium Dissolved 7775.80 4 of 4 316 196500 6285 Total 9258.79 4 of 4 455 251500 7484 Manganese Dissolved 7.40 3 of 4 BDL 26.15 6.0 Total 9.91 3 of 4 BDL 69.05 8.0 Molybdenum Dissolved 2.47 1 of 4 BDL 17.2 2.0 Total 2.79 1 of 4 BDL 31 2.26 Nickel Dissolved 76.10 3 of 4 BDL 237 61.5 Total 92.63 3 of 4 BDL 404 74.9 Silver Total 5.41 1 of 4 BDL 54.85 4.37 Sodium Dissolved 69616.18 4 of 4 3365 1750000 56270 Total 62604.54 4 of 4 1948.75 1955000 50602 Thallium Dissolved 4.72 3 of 4 BDL 15.7 3.82 Total 1.43 1 of 4 BDL 1.6 1.16 Tin Total 4.14 1 of 4 BDL 36.7 3.35 Titanium Total 4.05 2 of 4 BDL 9.75 3.27 Zinc Dissolved 140.24 4 of 4 23 847 113 Total 621.47 4 of 4 90.85 6125 502 ORGANICS ( μ g/L) ( μ g/L) ( μ g/L) ( lbs/ yr) 2-Propanone 36.00 1 of 4 BDL 107.5 29.1 Bis(2-Ethylhexyl) Phthalate 10.78 1 of 4 BDL 75 8.71 Chloroform 6.93 1 of 4 BDL 18.5 5.6 N,N-Dimethylformamide 6.67 1 of 4 BDL 11 5.39 N- Hexacosane 6.06 1 of 4 BDL 10 4.9 Toluene 10.91 1 of 4 BDL 113.5 8.82 Notes: (1) BDL = Below Detection Limit (2) Mass loadings were calculated based upon the results of the UNDS Non-Oily Machinery Wastewater Flow Characterization Report involving four vessels: CVN 74, DDG 67, LHD 5, and LSD 44. 2 (3) Log normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., "non-detect" samples), estimated analyte concentrations equivalent to one-half of the detection levels were used to calculate the mean. For example, if a "non-detect" sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the log normal mean calculation.

### Non-oily Machinery Wastewater 11 Table 2. Estimated Annual Mass Loadings of Constituents

Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Mass Loading

CLASSICALS (mg/L) (mg/L) (mg/L) ( lbs/ yr) Ammonia as Nitrogen 0.34 4 of 4 0.1 1 275 Nitrate/Nitrite 0.38 4 of 4 0.19 0.56 295 Total Kjeldahl Nitrogen 1.05 4 of 4 0.55 2.3 8.49

Total Nitrogen A 1.43

- 303 Total Phosphorous 1.03 4 of 4 0.14 11 833 ORGANICS ( μ g/L) ( μ g/L) ( μ g/L) ( lbs/ yr) Bis(2-Ethylhexyl) Phthalate 10.78 1 of 4 BDL 75 8.71

MERCURY ( ng/L) ( ng/L) ( ng/L) ( lbs/ yr) Mercury* 4.48 2 of 4 BDL 2135 .0036 METALS ( μ g/L) ( μ g/L) ( μ g/L) ( lbs/ yr) Copper Dissolved 148.76 4 of 4 34.35 1065 120 Total 599.96 4 of 4 34.2 3045 485 Nickel Dissolved 76.10 3 of 4 BDL 237 61.5 Total 92.63 3 of 4 BDL 404 74.9 Silver Total 5.41 1 of 4 BDL 54.85 4.37 Zinc Dissolved 140.24 4 of 4 23 847 113 Total 621.47 4 of 4 90.85 6125 502

BDL = Below Detection Limit A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

* Mercury was not found in excess of WQC; mass loading is shown only because it is a bioaccumulator.

Mass loadings were calculated based upon the results of the UNDS Non-Oily Machinery Wastewater Flow Characterization Report involving four vessels: CVN 74, DDG 67, LHD 5, and LSD 44. 2

### Non-oily Machinery Wastewater 12 Table 3. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituent Log-normal

Mean Minimum

Concentration Maximum

Concentration Federal Acute

WQC Most Stringent State

Acute WQC CLASSICALS (mg/L) Ammonia as Nitrogen 0.34 0.1 1 None 0.006 (HI) A Nitrate/Nitrite 0.38 0.19 0.56 None 0.008 (HI) A Total Kjeldahl Nitrogen 1.05 0.55 2.3 None

-

Total Nitrogen B 1.43 None 0.2 (HI) A Total Phosphorous 1.03 0.14 11 None 0.025 (HI) A ORGANICS ( μ g/L) Bis(2-Ethylhexyl) Phthalate 10.78 BDL 75 None 5.92 (GA)

Mercury ( ng/L) Mercury* 4.48 BDL 2135 1800 25 (FL, GA) Metals ( μ g/L) Copper Dissolved 148.76 34.35 1065 2.4 2.4 (CT, MS) Total 599.96 34.2 3045 2.9 2.5 (WA) Nickel Dissolved 76.10 BDL 237 74 74 (CA, CT) Total 92.63 BDL 404 74.6 8.3 (FL, GA) Silver Total 5.41 BDL 54.85 1.9 1.2 (WA) Zinc Dissolved 140.24 23 847 90 90 (CA, CT, MS) Total 621.47 90.85 6125 95.1 84.6 (WA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.
* - Mercury was not found in excess of WQC; concentration is shown only because it is a bioaccumulator.

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

### Non-oily Machinery Wastewater 13 Table 4. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Photo Lab Drains 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Photo Lab Drains

### Photo Lab Drains 2 2.0 DISCHARGE DESCRIPTION
This section describes the photographic laboratory drains and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Shipboard photographic laboratory wastes result from the processing of color, black-andwhite, and X-ray film. The chemicals used aboard vessels for these purposes are the same as those used at shore-based photographic facilities. This discharge is controlled by the Armed Forces by current guidance which requires containerization of all photo processing wastes for shore disposal when within 12 nautical miles (n.m.) of shore. 1



### The photographic wastewater processing system consists of three elements: a film processor, a washwater recycle system, and a fixer recycle and silver recovery subsystem. The film processor effluents include the developer and fixer solutions and the thiosulfate washwater stream. After the film is fixed, it goes through the washwater recycle system, where it is immersed in thiosulfate washwater and then sprayed with freshwater (rinsewater). 2 

### Black-andwhite and X-ray film effluents are then containerized for shore disposal or directly discharged overboard via the ship’s collection, holding, and transfer (CHT) system if outside 12 n.m. Fixer solutions must always be containerized for shore disposal within 12 n.m. Beyond 12 n.m. the fixer solution may be discharged overboard, provided the fixer solution is processed through a silver recovery unit, if one is available on-board. 3 

### A silver recovery unit uses an electrolytic recovery assembly to recover the silver from the recycled fixer solution. 2 

### The effluent from the recovery unit is then containerized, or discharged overboard if outside 12 n.m. 1 

### Color film processor effluent (small quantities) may be discharged directly overboard beyond 12 n.m. via the plumbing drain system. 3 

### In port, or in transit within 12 n.m., the effluent is containerized for shore disposal. In some cases, rinsewater is discharged to the CHT system in port for discharge ashore if local regulations permit.
The amount and frequency of waste generation across vessel classes will vary depending upon the vessels’ photo processing capabilities (color and/or black-and-white), equipment, and operational objectives. Color film processing waste is generated from batch quantities of developer, fixer, and intensifier solutions. Black-and-white and X-ray film processing waste is generated from processor effluent, stop bath, detergents, and hardener solutions. Many vessels are now being outfitted with self contained automatic processors or digital processors. Automatic processors do not produce a continuous rinsewater stream. Digital processors do not use chemicals. 4



### 2.2 Releases to the Environment
Photographic processing effluents are only discharged outside of 12 n.m. from shore. Black-and-white and X-ray photographic processing effluent is discharged overboard via the CHT system. Color film processor effluent is permitted to be discharged overboard above the

### Photo Lab Drains 3 waterline via the plumbing drain system. 1 

### The discharge can consist of stop bath, detergents, hardener, developer, fixer, and rinse solutions.

2.3 Vessels Producing the Discharge
Navy vessels such as aircraft carriers (CV/CVN), amphibious assault ships (LHD/LHA/LPD/LCC), and submarine tenders (AS) have photographic laboratory facilities, including color, black-and-white and X-ray photographic processors. Two Military Sealift Command (MSC) hospital ships (T-AH) have photo processing equipment, but neither is used on a routine basis or within U.S. contiguous or territorial waters. The U. S. Coast Guard (USCG) currently has two WAGB 400 Class icebreakers with photographic and X-ray processing capabilities, but does not discharge wastes overboard within 12 n.m. of shore. 5 

### The Army and the Air Force are not expected to produce this discharge because their vessels do not have photographic developing capabilities.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Naval Ships’ Technical Manual (NSTM) , Chapter 593, provides uniform guidance in the handling and disposal of photographic processing chemicals. While in port or in transit within 12 n.m., all discharges of X-ray, color and black-and-white photographic processing fixers, and developers are containerized for shore-side disposal. Film rinsewaters are not containerized in port due to their large volumes, but are disposed of in to the CHT system. The CHT system is connected to the pierside collection piping while the vessel is docked. Therefore, overboard discharges of photographic processing effluents do not occur from any vessel within 12 n.m. of shore, and most vessels containerize their waste even beyond this point.
Beyond 12 n.m., all photo processing chemicals, if not containerized, are directed to the CHT system where they are mixed with blackwater and discharged overboard. 3 

### Wastes that can be directed to the CHT system are black-and-white and X-ray film processing waste from processor effluent, stop bath, detergents, hardener solutions, and silver recovery unit effluent.

3.2 Rate
Discharge flow rate data were not obtained.

3.3 Constituents

### Photo Lab Drains 4 Table 1 lists the chemical constituents identified in the most commonly used developing solutions and fixers, and in rinse waters on vessels of the Armed Forces. Silver is the only priority pollutant in this discharge. There are no known bioaccumulators identified in this discharge.

3.4 Concentrations
The range of photographic processing chemical concentrations was not obtained.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. Mass loadings are discussed in Section 4.1 and the concentrations of discharge constituents after release to theenvironment are discussed in Section 4.2. In Section 4.3, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Constituent mass loadings were not calculated since the dis charge does not occur inside 12 n.m. Furthermore, discharge concentrations and flow rates are unknown.

4.2 Environmental Concentrations
Concentrations released to the environment were not calculated since the discharge does not occur inside 12 n.m. and the discharge concentrations are unknown.

4.3 Potential for Introducing Non-Indigenous Species
Potable water is used in photographic laboratories; therefore, there is no possibility for the introduction, transport, or release of non-indigenous species.

5.0 CONCLUSIONS
Existing data are insufficient to determine whether drainage from shipboard photographic labs has the potential (or has a low potential) of causing an adverse environmental effect.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources were obtained. Table 2 shows the sources of the data used to develop this NOD report.

### Photo Lab Drains 5 Specific References

1. Naval Ships’ Technical Manual (NSTM) Chapter 593 Appendix D, pp D-9 and D-10, Disposal Guidelines For Shipboard Hazardous Waste. September 1, 1991.

2. Laboratory Evaluation of a Photographic Wastewater Processing System, prepared by David W. Taylor Naval Ship Research and Development Center, Bethesda, MD. August, 1982.

3. UNDS Equipment Expert Meeting Minutes. Photo Laboratory Discharges - April 2, 1997.

4. Personal Communication Between John Julian, NAVSEA 03L13, and Sr. Chief Freeland, Naval Imaging Command, on Self Contained Automatic Processors and Digital Processors for use in Photographic Laboratory. September 23, 1997.

5. Personal Communication Between LT. Joyce Aivalotis, U.S. Coast Guard and Dan Mosher of Malcolm Pirnie, Inc., on USCG Photographic Processing Procedures. April 28, 1997.

6. Personal Communication Between Albert Browne, NAVSEA 03L13, and Mr. Joseph MacDonald, NAVSEADET (PERA-CV), on Kodak Processor Chemistry Listings for Kreonite/Kodak RA-4, Black-and-White Imagemaker, and Kodak C-41 Color Imagemaker Processors. July 25, 1996.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter

### Photo Lab Drains 6 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Photo Lab Drains 7 Table 1. Chemical Constituents Identified in the Most Commonly Used Photographic Developing Solutions and Fixers, and in Rinse Waters on Vessels of the Armed Forces 6

1,3 - propylenediaminetetraacetic acid Diethanolamine - sulfur dioxide potassium hydroxide 2- aminoethanol Diethanolamine - sulfur dioxide complex potassium sulfite

4 - (N-ethyl- N-2- methanesulfonylaminoethyl) - 2 - methylphenylenediamine sesquisulfate monohydrate diethylene glycol propylene glycol

4 - (N-ethyl-N-2-hydroxyethl)-2- methylphenylenediamine sulfate Formaldehyde silver*

4 - (N-ethyl- N-2- methanesulfonylaminoethyl) - 2 - methylphenylenediomine sulfate glacial acetic acid sodium acetate

acetic acid Hydroquinone sodium bisulfite aluminum sulfate Hydroxylamine sulfate sodium citrate Ammonia Isothiazolones sodium metabisulfite ammonium (ethylenodinitrilo) tetraacete) ferrate lithium sulfate sodium sulfite

ammonium acetate methyl alcohol sodium sulfosuccinate ammonium bromide N,N-diethylhydroxylamine stilbene brightner ammonium citrate nitric acid sulfuric acid ammonium ferric ethylenediaminetetra acetic acid Organosilicone fluid tetra sodium ethylene diamine tetraacetrate ammonium ferric propylenediaminetetraacetic acid penitetic acid triethanolamine

ammonium sulfite potassium bicarbonate ammonium thiosulfate potassium carbonate boric acid potassium chloride * Priority Pollutant



### Table 2. Data Sources

Data Sources

NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X 2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate (NA) 3.3 Constituents X X 3.4 Concentrations (NA) 4.1 Mass Loadings (NA) 4.2 Environmental Concentrations (NA)4.3 Potential for Introducing NonIndigenous Species X



### Note: NA = not applicable

### Portable Damage Control Drain Pump Discharges 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Portable Damage Control Drain Pump Discharges

### Portable Damage Control Drain Pump Discharges 2 2.0 DISCHARGE DESCRIPTION
This section describes the portable damage control drain pump discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Damage control (DC) systems are the fluid, electrical, and ventilation systems that contribute to combating fires, controlling or removing smoke and/or water, or transmitting power and communications. Facilities for dewatering compartments in the event of an emergency consist of fixed drainage systems within the vessel and portable equipment, such as electric submersible pumps, P-250 or P-100 pumps, and eductors (Figure 1). Portable DC dewatering equipment is used in emergencies to assist recovery from fire and flooding events by removing fluids from damaged compartments or from compartments without drainage systems located close to, or below, the waterline. Emergency situations are not incidental to the normal operation of the vessel and therefore not considered in this report. The only required operation which produces a discharge incidental to the normal operation of the vessel is during planned maintenance system (PMS) activities for the equipment. This report addresses only planned maintenance activity discharges from this equipment.
Three basic types of dewatering equipment used in damage control situations are described below.

• Portable electric submersible pumps are used to dewater compartments that do not have an installed drainage system. The pump is driven by an electric motor enclosed in a watertight case that allows the pump to operate while submerged. These pumps are fitted with strainers to prevent debris from clogging the impeller. This pump does not use a suction hose, and the fluid is discharged through a fire hose.

• Portable engine-driven pumps are designed for firefighting but can also be used for dewatering operations. Engine-driven pumps take suction through a hard rubber hose and discharge through a fire hose. The P-250 has a pumping capacity of 250 gallons per minute (gpm). The P-100 pump is driven by an air-cooled diesel engine and has apumping capacity of 100 gallons per minute (gpm). The P-1 (Figure 2) and P-5 (CGP1B and CG-P5) are gasoline-driven portable pumps used by the U.S. Coast Guard (USCG). The P-5 is similar in design to the P-1, but it has a larger pumping capacity. The P -1 ha s a pumping capacity of 120 gpm, and the P-5 has a pumping capacity of 200 gpm. 1,2



### • Portable eductors Portable eductors are actuated from the discharge of a P-250 or P100 pump or through a fire hose using the vessel’s installed firemain. A suction hose is not used with portable eductors because the eductor is submerged during operation. The eductor discharges through a fire hose which is lead directly overboard.

### Portable Damage Control Drain Pump Discharges 3 Maintenance schedules for the portable electric submersible pump and portable eductors do not include a requirement for operation that will produce a discharge. 3 

### The USCG P-1 and P5 pumps are pre-packaged for transfer to a vessel in distress, and periodic maintenance schedules do not include a requirement to operate the pumps to produce a discharge. The maintenance schedules for the Navy, the Military Sealift Command (MSC), and Army P-100 and P-250 pumps include a requirement to operate the pumps monthly for 10 minutes and annually for 15 minutes: the annual check is concurrent with a monthly check. 4 

### Current USCG maintenance schedules require P-250 pumps to be operated for 30 minutes each month, but the maintenance procedures are expected to be changed to require only a 15 minute run each month. 5,6



### 2.2 Releases to the Environment
During maintenance, P-250 and P-100 pumps are operated to demonstrate proper function by pumping seawater adjacent to the vessel via a hard rubber suction hose through the system and discharging it directly overboard through a fire hose. 7



### The P-250 pump uses a portion of the pump discharge to cool the engine exhaust. This cooling water is discharged separately from the pump discharge and is not considered part of this discharge stream. It is addressed in a separate NOD report entitled “Portable Damage Control

2.3 Vessels Producing the Discharge
All Navy, MSC, and USCG surface ships can discharge seawater from portable DC drain pumps. There are 906 emergency fire pumps on Navy surface vessels. The MSC maintains 137 pumps, and the USCG has 370 pumps on its surface vessels. The Army is currently equipped with 60 P-250 MOD 1 pumps and six P-100 pumps. The Air Force does not use portable pumps on any of their water craft. The numbers of individual pumps within the fleets are: 8,9,10,11,12,13,14



### P-250 MOD 1 P-100 Navy 70 836 MSC 0 137 USCG 370 0 Army 60 6 Totals 500 979
The Navy is completely converting to P-100 pumps, and it is estimated that all P-250’s in Navy service will be replaced by P-100’s by the end of 1998. 8 

### The Army has also begun to replace P-250’s with P-100 pumps, but a timetable for complete conversion has not yet been developed
As mentioned previously, the USCG P-1 and P-5 pumps are pre-packaged for transfer to a vessel in distress. These pumps are not required to be operated during periodic maintenance so these pumps produce no discharge incidental to normal vessel operations.

### Portable Damage Control Drain Pump Discharges 4 3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
As part of equipment maintenance, the portable damage control equipment is operated within 12 nautical miles (n.m.).

3.2 Rate
Individual vessel discharge volumes from emergency pumps will vary depending on the numbers and types of pumps aboard each vessel. Therefore, flow rates will be calculated on a fleet-wide basis instead of a ship-by-ship basis.
Using standard maintenance operating schedules, pump inventory data, and pump discharge rates, discharge flow estimates were calculated as shown in Table 1. During monthly maintenance activities, the Navy, MSC, and Army run pumps for approximately 10 minutes and for approximately 15 minutes during annual maintenance checks. The USCG currently operates its pumps for 30 minutes per month. The resulting total annual discharge is approximately 49,062,500 gallons.
Approximate annual flow rates for representative ship types are listed below:

Ship Type Pump Type Carried and Number per Ship Pump Flow

Rate (gpm) Annual

Operating Time (Minutes/Year) Total Yearly

Flow rate per Ship Surface Combatant (DD, DDG, CG, FFG) 4 - P-100’s 100 125 50,000

Large Auxiliary or Amphibious Ship (e.g.: AFS, AOE, LPD, LSD) 6 - P-100’s 100 125 75,000

USCG Cutter (WHEC) 3 - P-250’s 250 360 270,000 Army Watercraft (LCU-1600) 1 - P-250’s 250 125 31,250

3.3 Constituents
The portable DC drain pump discharge is seawater that is pumped during maintenance activities. The seawater contacts rubber suction hoses and the rubber lining of firehoses. It also contacts the wetted components of the pump (e.g. impeller). The pumps and hoses are not

### Portable Damage Control Drain Pump Discharges 5 expected to contribute measurable amounts of pollutants to the discharge because the residence times of the seawater within the equipment is less than 5 seconds.

3.4 Concentrations
The discharge is expected to be seawater with no measurable contribution of constituents from the pumping process.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings and environmental concentrations are discussed in Section 4.1 and 4.2. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
The portable DC drain pump discharge is seawater that is pumped during maintenance activities. The seawater contacts rubber suction hoses and the rubber lining of firehoses. It also contacts the wetted components of the pump (e.g. impeller). The pumps and hoses are not expected to contribute measurable amounts of pollutants to the discharge because the residence times of the seawater within the equipment is less than 5 seconds.

4.2 Environmental Concentrations
The discharge is expected to be seawater with no measurable contribution of constituents from the pumping process.

4.3 Potential for Introducing Non-Indigenous Species
There is an insignificant potential for introducing non-indigenous species from this discharge. The seawater pumped through the portable DC drain pumps is discharged in the same location from which it was taken.

5.0 CONCLUSION
The portable DC drain pump discharge has a low potential for causing an adverse environmental effect because the discharge consists of seawater pumped and discharged at the same location from which it was taken. The pumps and hoses are not expected to contribute significant amounts of pollutants to the discharge because the residence time of the seawater within the equipment is less than 5 seconds.

### Portable Damage Control Drain Pump Discharges 6 6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information and assumptions were used to estimate the annual discharge volume. Table 2 shows the source of the data used to develop this NOD report.
Specific References

1. Gallagher, Larry, M. Rosenblatt & Son, Inc. Portable DC Dewatering Equipment, April 1997, Leslie Panek, Versar, Inc.

2. USCG COMDTINST M10470.10C - Chapter 2, Dewatering Pump Kit. Unknown date.

3. Maintenance Index Page (MIP) 6641/Z06-76, Damage Control Stations. April 1995.

4. Maintenance Index Page (MIP) 6641/008-B2, Portable Gasoline/JP-5 Driven Pump. November 1992.

5. USCG Uniform Maintenance Procedure Card (UMPC) R -M-014.

6. Personal Communication, LT Joyce Aivalotis USCG to M. Rosenblatt & Son, June 5, 1997.

7. Steinberg, Bob, M. Rosenblatt & Son, Inc. Portable DC Dewatering Equipment, January 1997, Leslie Panek, Versar, Inc.

8. Personal Communication (Fonecon): Steinberg, Bob, M. Rosenblatt & Son. Status of USN P-250 Replacement Program, 23 January 1998, Mark Hampson, NSWC

9. UNDS Equipment Expert Meeting Minutes - Emergency Fire Pump Wet Exhaust. March 26, 1997.

10. Personal Communication between Chief Warr ant Officer Dunbar, USCG and Doug Hamm, Malcolm Pirnie, Inc., January 26, 1997 and March 27, 1997.

11. Personal Communication (Fonecon): Steinberg, Bob, M Rosenblatt & Son. Status of MSC P-250 Replacement Program, 5 February 1998, Joe Bohr, MSC Code N72PC

12. Saponara, N. et al. “UNDS Shipcheck of US Army Watercraft, Fort Eustis, VA, 21-22 January 1998: Trip Summary”, undated

13. Personal Communication (Fonecon): Steinberg, Bob, M. Rosenblatt & Son, Inc. Army Purchases of P-100 Pumps, 14 January 1998, Paul Darley, W.S. Darley & Co.

14. Personal Communication (VoiceMail): Chew, Don, LCOL, USAF, HQ, USAF (ILTV).

### Portable Damage Control Drain Pump Discharges 7 Portable damage control pumps on Air Force Watercraft, 21 January 1998, Bob Steinberg, M. Rosenblatt & Son, Inc.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter

### Portable Damage Control Drain Pump Discharges 8 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Portable Damage Control Drain Pump Discharges 9 Figure 1. Dewatering Equipment

### Portable Damage Control Drain Pump Discharges 10 Figure 2. Portable Dewatering Pump (Model CG-P1B)

### Portable Damage Control Drain Pump Discharges 11 Table 1. Annual Discharge from Portable DC Drain Pumps

Service Pump Model Number of Pumps Flow (GPM) Annual

Operating Time (Minutes/Year) Annual Discharge (Gallons/Year)

Navy
P-250 MOD 1 70 250 125 2,187,500

P-100 793 100 125 9,912,500

Navy Total: 12,100,000

MSC
P-250 MOD 1 0 250 125 0

P-100 137 100 125 1,712,500

MSC Total: 1,712,500

USCG P-250 MOD 1 370 250 360 33,300,000

Army P-250 MOD 1 60 250 125 1,875,000

P-100 6 100 125 75,000

Army Total: 1,950,000
Cumulative Total: 49,062,500



### Table 2. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation Equipment manuals PMS cards X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge X X 3.1 Locality X X 3.2 Rate PMS cards X 3.3 Constituents X X X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X 4.3 Potential for Non-indigenous Species X

### Refrigeration/AC Condensate 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Refrigeration/AC Condensate

### Refrigeration/AC Condensate 2 2.0 DISCHARGE DESCRIPTION
This section describes the condensation discharge that is produced from air conditioner (AC) units, refrigerated spaces, and stand-alone refrigeration units and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
AC units provide cooling for ship spaces. When warm, moist air passes over the refrigeration coils of an AC unit, condensation forms that drips from the coils. This condensation is produced continuously while the AC unit is operating. In addition to AC units, vessels have refrigerated spaces for food and other perishable materials. These spaces are designed for both frozen and chilled cargo and commonly range in temperature from below 0 ° F to 35 ° F. 1 

### Condensation also forms from the normal operation of these refrigerated spaces when moist air is cooled below the dew point on the cold evaporator coils of the refrigeration system. The condensate is collected in drains in these refrigerated spaces.
Two types of refrigerated space systems are used: gravity-coil units and forced-air units. Gravity-coil units are typically used in older ships. They employ tinned-copper refrigerant piping which runs back and forth along one or more bulkheads in the refrigerated space. 1 

### Aluminum fins are attached to the piping to provide a large surface area for the exchange of heat. As the air cools, it becomes more dense and sinks below the comparatively warmer air, creating circulation without the need for a fan. One disadvantage to this type of cooling unit is that the tubing is bulky, so the use of gravity-coil units has been discontinued on newer Navy ships. Forced-air refrigeration units are more compact, self-contained, and use a fan to blow air across the coils. The forced-air units can be used not only in cold storage spaces, but also in other ship spaces.

On most surface ships, gravity coil refrigerant piping is made of tinned-copper. 1,2,3 

### The forced-air units have brazed-copper piping. Submarine refrigerated space refrigerant piping and evaporator coils are made of copper. 1



### Drip troughs (galvanized steel or tinned-copper) are installed under gravity-type cooling coils to collect condensate or water during defrosting. 1 

### The piping from these troughs is as short as practicable and leads to compartment drain piping. The forced-air units have drip pans made of galvanized steel or tinned-copper which are placed under the units to collect the condensate. Valved deck drains are also installed in refrigerated spaces that have operating temperatures above 32 ° F. Deck drains are installed in refrigerated spaces with operating temperatures below 32 ° F. At least one deck drain is installed in the passage or compartment outside the refrigerated food storage spaces. 1



### The condensate drainage is similar for vessels of all the Armed Forces: condensate produced above the waterline is directed overboard; condensate produced below the waterline is retained on board temporarily before it is pumped overboard. On most Navy ships, condensate is routed directly overboard or combined in a common condensate drain and discharged overboard

### Refrigeration/AC Condensate 3 if the space is above the waterline or to a condensate drain tank if the space is below the water line. 2 

### Some condensate may also be directed to the machinery space wastewater drain system, the wastewater receiving tank, the sewage collection, holding, and transfer (CHT) tank, or the bilge. On Army watercraft, condensate from refrigeration and air conditioning systems is not collected. Any condensate which forms is typically removed by natural evaporation; if a significant amount of condensate accumulates, it may be removed by mopping or wiping. On vessels of the other Armed Forces, the condensate is discharged to the bilge from spaces below the waterline.
On submarines, drains are installed in chilled stores space decks to remove water from condensation and defrosting. The drains are provided with an isolation valve and lead to a bilge collecting tank or sanitary tank.

2.2 Releases to the Environment
Refrigeration/AC condensate is generally released to the environment by direct gravity drainage overboard, or in some cases from a condensate drain tank or other collection points below the waterline. In addition to continuous condensate drainage, intermittent discharges from refrigerated spaces include water and mild detergents used for cleaning (generally weekly), and water from melting ice that is created when the spaces are defrosted (for gravity-coil units, weekly or when the thickness of the frost on the refrigeration coils exceeds 3/16 inch). 4 

### The water from cleaning and defrosting is discharged into the space drains or the deck drains.
Organic materials can be an infrequent part of the discharge from residual spilled food items that wash into the drainage. Although spilled food can be washed to drains occasionally, spills would normally be cleaned and disposed of as solid waste or into graywater drains.
Navy supply ships that carry refrigerated cargo for at-sea replenishment of Navy combatants use hot seawater spray to defrost the cargo spaces. This seawater, as well as the freshwater used to flush out any residual seawater after defrosting, is discharged through the refrigeration condensate drainage piping. The seawater is provided by the firemain and is heated to 100 °F by a dedicated heater prior to being sprayed at a maximum rate of 100 gallons per minute on the refrigeration coils. The vessel classes that employ heated seawater spray for defrosting are the AFS, AOE, AO, and AOR classes. 5



### Refrigeration condensate could contain trace amounts of metal from the refrigerant coils and drainage piping, but these concentrations are expected to be comparatively low (see Section 3.4).

2.3 Vessels Producing the Discharge
Navy and MSC vessels produce refrigeration and AC condensate; this includes 254 Navy surface ships, 94 Navy submarines, and 70 MSC ships. 2 

### In addition, an estimated 228 Coast Guard vessels and 4 Air Force vessels produce this discharge.

### Refrigeration/AC Condensate 4 The primary difference between ship classes is the amount of condensate that is generated, which depends on ambient temperature, relative humidity, and the size and number of units per ship. USCG vessels also produce refrigeration and AC condensate, and use specifications similar to the Navy for refrigeration and AC units. Army watercraft have no collection or discharge of condensate from refrigeration or air conditioning systems.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Flows from refrigeration units a nd AC units can be discharged at any time, both within and beyond 12 nautical miles (n.m.) from shore. Operation of the refrigerated spaces and AC units in port or in transit is not significantly different from operation beyond 12 n.m. from shore.

3.2 Rate

N o measurements are available to fully characterize the flow for refrigeration/AC condensate for all ship classes. The range of flow rates volumes will depend on the temperature and humidity of the air and the capacity of the cooling units.
Amphib ious ships and aircraft carriers of the Navy tend to have the most air conditioning capacity because of their large contingent of personnel, and therefore, represent worst-case flow rates for AC condensate discharge. An estimate of AC condensate volume was developed for an amphibious ship and an aircraft carrier. The estimate was derived for typical ship operating conditions. The worst-case scenario assumes an unlimited supply of humid air (above 60 ° F) to the AC system. In reality, after the air has been dehumidified, the exchange rates with new air are much lower and will limit available moisture for condensate to about half the worst case amount. The estimate also assumed that condensate is generated when the outside air is 60 ° F dry bulb or higher. 6



### Based on the above conditions, an amphibious ship will generate no more than 3,840 gallons of condensate per day, and an aircraft carrier no more than 6,795 gallons per day. Vessels of the other Armed Forces tend be smaller and have fewer personnel, and therefore, will produce less AC condensate discharge.

3.3 Constituents
Refrigeration condensate could contain metals from the refrigerant coils and condensate drainage piping, and mild detergents from the occasional cleaning of the refrigerated spaces. AC

### Refrigeration/AC Condensate 5 condensate could contain small amounts of metal from the AC coils or the drain piping. These materials can include aluminum, bronze, copper, iron, lead, nickel, silver, tin, and zinc.
Food particles washed into the condensate drainage system from o ccasional food spills would increase the Biochemical Oxygen Demand (BOD) in the discharged water. Seawater used to defrost cargo spaces on Navy supply ships, and the freshwater used to flush residual seawater from the cargo spaces are also intermittent constituents of this discharge.
The priority pollutants of this discharge are copper, lead, nickel, silver, and zinc. None of the constituents of this discharge is a bioaccumulator.

3.4 Concentrations
Refrigeration/AC condensate can contain small amou nts of metals from contact with refrigerant coils and condensate drainage piping. These concentrations are expected to be low for the following reasons:
1) Condensate is essentially pure water and is not a corrosive medium such as seawater; 2) Drainage lines are only fractionally full of condensate which indicates qualitatively low flow and low residence time; 3) Condensate drainage flow velocities and turbulence are extremely low. Therefore, erosion of metals in drainage is not a factor as it could be in pressurized seawater systems; 4) The residence time of condensate in drainage systems is low. The negligible increase in the residence time because of the slower flow does not increase the chance of entrainment of metals; 5) Copper drainage piping forms a protective corrosion-inhibiting film of cuprous oxide on surfaces in contact with water; 7 

### and 6) The low temperature of this discharge, both on refrigeration coils and in the condensate drainage piping, would tend to inhibit the corrosion process.
Food spills which could contribute some organic matter to the discharge are intermittent and limited to small amounts. Therefore, they are expected to contribute very little BOD to the discharge. Seawater is also a component of refrigeration condensate discharge of vessels with cargo refrigeration spaces.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. Mass loadings are discussed in Section 4.1 and the concentrations of discharge constituents after release to theenvironment are discussed in Section 4.2. In Section 4.3, the potential for the transfer of nonindigenous species is discussed.

### Refrigeration/AC Condensate 6 4.1 Mass Loadings
Mass loadings were not calculated for this discharge.

4.2 Environmental Concentrations
Refrigeration/AC condensate is essentially atmospheric moisture which condenses on refrigeration coils. For reasons stated in Section 3.4, concentrations of any of the potential constituents in this discharge are expected to be low. Therefore, the probability that this discharge results in any measurable effect on environmental concentrations is low.

4.3 Potential for Introducing Non-Indigenous Species
Because this discharge consists of atmospheric moisture, the potential for introducing non-indigenous species is not significant.

5.0 CONCLUSION
Mass loadings and environmental concentrations cannot be calculated with existing information; however, process information is sufficient to characterize the concentrations and loadings of constituents of this discharge.
Refrigeration/AC condensate has a low potential for adverse environmental effect because:
1) the liquid discharge is moisture condensed from the air;2) concentrations of metals are expected to be low due to the non-erosive and noncorrosive nature of this discharge, and its low temperature; and 3) the contribution from detergents and from food residues is expected to be small and intermittent in nature.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Table 1 shows the sources of data used to develop this NOD report.
Specific References

1. Naval Sea Systems Command (NAVSEA), General Specifications for Ships of the United States Navy, Section 516 - Refrigeration Plants. 1995 Edition.

2. UNDS Equipment Expert Meeting - Refrigeration/AC Condensate. 15 October 1996.

### Refrigeration/AC Condensate 7 3. Military Sealift Command (MSC), General Specificatio ns for T-ships, Section 514 - Air Conditioning Refrigeration Systems. 1991 Edition.

4. Maintenance Requirement Card (MRC) A3 8YVEN, Refrigeration Plant. October 1993.

5. Kitchen, Gary, NAVSEA 03L2. Cargo Space Refrigeration Coil Defrosting, 9 January 1998, Matthew Worris, M. Rosenblatt & Son, Inc.

6. Goodhue, John, NAVSEA 03L2. Estimate of Air Conditioning Condensate Rates for UNDS, 23 April 1997, Leslie Panek, Versar, Inc.

7. Davis, Joseph R., et al., Metals Handbook Ninth Edition, Volume 1 3, Corrosion, ASM International Handbook Committee, Metals Park, Ohio, 1990.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.

### Refrigeration/AC Condensate 8 New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Naval Sea Systems Command (NAVSEA), General Specifications for Ships of the United States Navy, Section 528 - Plumbing, Plumbing Vents, and Space and Weather Deck Drains. 1995 Edition.
Naval Sea Systems Command (NAVSEA), General Specifications for Ships of the United States Navy, Section 534 - Machinery and Piping Systems Drainage. 1995 Edition.
Baumeister, Theodore; Eugene Avallone; and Theodore Baumeister III. Marks' Standard Handbook for Mechanical Engineers. McGraw-Hill Book Company, Eighth Edition, 1978.
Harrington, Roy L. Marine Engineering. The Society of Naval Architects and Marine Engineers, 1971.
Sharpe, Richard. Jane’s Fighting Ships. Jane’s Information Group, Ltd., 1996.
Naval Sea Systems Command (NAVSEA), General Specifications for Ships of the United States Navy, Section 514 - Air Conditioning Plants. 1995 Edition.
UNDS Equipment Expert Meeting - U.S. Army Input to Equipment and Expert Meeting, Refrigeration/AC Condensate. 5 February 1997.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Refrigeration/AC Condensate 9 Table 1. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents MSDS X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Rudder Bearing Lubrication 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Rudder Bearing Lubrication

### Rudder Bearing Lubrication 2 2.0 DISCHARGE DESCRIPTION
This section describes the rudder bearing lubrication discharge and includes information on the equipment used, its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Rudder bearings support the rudder and allow it to turn freely. While there are small variations among similar rudder bearings systems, there are generally two major types of rudder bearings and two lubricating methods for each type, resulting in four different bearing/lubrication method combinations. They are:

• grease-lubricated roller bearings,

• oil-lubricated roller bearings,

• grease-lubricated stave bearings, and

• water-lubricated stave bearings.
Grease-lubricated Roller Bearings. The rudder stock arrangement for grease-lubricated roller bearings includes a void space between the lower bearing and the hull seal (Figure 1). This design prevents seawater from entering the bearing and causing damage. Water that leaks past the hull seal, as well as grease that leaks past the bearing seals, will enter the void space and drain to the bilge. Thus, discharges from grease-lubricated roller bearings contribute to the bilgewater discharge which is covered in a separate NOD report. Since 1970, grease-lubricated roller bearings have been preferred for use on rudder stocks.
Oil-lubricated Roller Bearings. There is no void space in the rudder stock arrangement used for oil-lubricated roller bearings and the bottom seal of the lower bearing serves as the hull seal (Figure 2). To prevent water from entering the bearing and causing damage, the oil is kept at

a slight positive pressure relative to the surrounding seawater pressure by supplying the oil from an elevated “head” tank located above the waterline. If a leak occurs, this positive pressure will cause lubricating oil to leak directly into the sea. 1



### Stave Bearings (Grease and Water Lubricated). This type of bearing is typically located outside of the hull (Figure 3). Stave bearings, which are similar in appearance to the wooden staves that make up a barrel, are typically made of a phenolic-resin material. Depending on the actual type, these stave bearings may be lubricated by grease or water. Grease, when used,is forced into the bearing to lubricate the area where the rudder stock and staves meet. Waterlubricated stave bearings are designed with passages which allow seawater to flow through the bearing. For classification purposes, the bushings found on small boats and craft are included in this subheading due to the similarities in function and design.
Hull seals are used with all types of rudder bearings. A hull seal is installed where the rudder stock penetrates the hull. This seal prevents seawater from entering the ship and damaging the lower bearing, while in the case of oil-lubricated roller bearings it also keeps the

### Rudder Bearing Lubrication 3 oil in the bearing cavity from leaking to the sea. In many cases this seal is a type of lip seal but flax packing can be found on older ships. A lip seal consists of a rubber circular ring with a flexible lip. This lip has a narrow contact area that rubs on the circumference of the shaft, forming a seal. Flax packing seals in a similar fashion as several rows of the circular packing material rubs along the rudder stock. Minor leakage can occur in both cases and their rubbing contact will eventually cause wear on the rudder stock. Hull seals are inspected when the ship is in dry dock, typically every four or five years.
The potential of oil leakage from lip seals and flax packing is greatest when a vessel is underway and the rudder is in use rather than when pierside and the rudder is idle. When the vessel is underway, the action of turning exerts forces on the rudder and rudder stock that can cause a temporary gap in the seal or packing coverage. The harder the turn or higher the vessel speed, the greater these forces are and the greater the potential is for oil leakage and the amount of leakage.
The latest trend in rudder stock hull sealing is to use a face seal. These seals eliminate the minor leakage sometimes associated with lip seals and flax packing. Face seals move the sealing point away from the rudder stock to two circular, hard, mating faces. One half of the seal rotates with the rudder stock while the other half is rigidly attached to the hull of the ship. These mating faces are honed to very small tolerances and while rubbing together prevent liquids from seeping through their very fine and smooth contact area. Face seals used on rudder stocks are designed not to leak as a result of the forces placed on the rudder stock during turning. 1



### 2.2 Releases to the Environment
The two releases possible are oil from oil-lubricated roller bearings and grease from grease-lubricated stave bearings.

2.3 Vessels Producing the Discharge
All Navy surface ships have rudder bearings, except for those with steerable thrusters or cycloidal propellers, such as the MHC 51 Class minesweepers. 1 

### Vessels belonging to the Military Sealift Command (MSC), U.S. Coast Guard (USCG), Army, and Air Force also have rudder bearings.
Most rudder bearings (roller or stave) are grease-lubricated. Only the AS 36/39 Class and AOE 1 Class ships, which form 4 percent of the total number of Navy ships, have oil-lubricated rudder bearings. The T-AFS 1 and T-AE 26 Classes of MSC are also fitted with oil-lubricated rudder bearings. USCG vessels do not have oil-lubricated rudder bearings. The rudder bearings or bushings found on small boats and craft are typically made of self-lubricating materials and are either not lubricated or use water for lubrication.
Surface ship rudders with oil-lubricated roller bearings and grease-lubricated stave bearings have the potential to produce an oil or grease discharge. Table 1 lists the rudder bearing type and lubrication method for each Navy ship class. There are currently five Navy ships that

### Rudder Bearing Lubrication 4 use oil lubrication for rudder bearings. Five AS 36/39 Class ships (submarine tenders) and four AOE 1 Class ships (fast combat support ships) were originally fitted with lip seals. Of the submarine tenders, AS 36 and AS 37 are being decommissioned. 2 

### The three remaining ships (AS 39-41) are currently scheduled to have their lip seals replaced with face seals. The replacements are expected to begin in 1999 and conclude in 2002. 1 

### Of the four AOE 1 Class ships, AOE 2 and AOE 3 have been fitted with face seals. The other two ships in the class are also scheduled to be fitted with the same type of face seal. 3 

### Therefore, any discharges of oil from the rudder bearings on Navy vessels is expected to be eliminated in the next 4 to 5 years. Of the MSC ships, the T-AE 35 had the face seal installed in December 1997. 4



### USCG ships use water- and grease-lubricated bearings on their rudder stocks, as summarized in Table 2. 5 

### Small boats and craft use bearings/bushings that are either selflubricated or water-lubricated. The lubricity of the materials used in self-lubricated bearings/bushings is such that additional lubricants are not required; water-lubricated bearings/bushings are also made of special materials, but require water to be present on their contact surfaces for proper lubrication. Table 3 lists the rudder bearings/bushings found in USCG small boats and craft. 6 

### The upper bearing/bushing of these small boats and craft is typically self- or grease-lubricated because it may not contact the water, while the lower bearing/bushing is lubricated by being submerged in the water. The USCG is increasing the use of self-lubricated bearing material in its ships and is reducing the use of grease as a lubricating material in all areas exposed to the sea and weather. 5



### Table 4 lists MSC vessels, including the type of bearing, method of lubrication, and allowable leakage rates. Eight TAE 26 Class and eight TAFS 1 Class vessels have oil lubricated bearings.
Army and Air Force vessels have rudder bearings similar to those found on Coast Guard vessels of comparable size.

3.0 DISCH ARGE CHARACTERISTICS
This section contains qualitative and quantitative information which characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
This discharge can occur in port and while operating within 12 nautical miles (n.m.).

3.2 Rate
This discharge comprises the leaking of oil or the washout of grease from rudder bearings. For the oil discharge, rules-of-thumb for characterizing hull seal failure limit the hull

### Rudder Bearing Lubrication 5 seal leakage rates to one gallon per day at sea and one pint per day in port. 2 

### These rates are abnormally high and are typically associated with a malfunctioning or failing seal. Little or no leakage would be expected from a properly functioning and maintained seal.

3.3 Constituents
In general, greases and lubricating oil s are made from lubricating stocks generated during petroleum fractionation. These fractions contain organic compounds that are generally larger molecules, containing more than 17 carbon atoms. Lubricating oils are composed of aliphatic, olefinic, naphthenic (cycloparaffinic), and aromatic hydrocarbons, as well as additives, depending on their specific use. Lubricating oil additives may include antioxidants, bearing protectors, wear resistors, dispersants, detergents, viscosity index improvers, pourpoint depressors, and antifoaming and rust-resisting agents. 7 

### Not all the additives may be present at one time. It is anticipated that the additives are similar to those found in commercial oils. There are no bioaccumulators expected to be present in this discharge.

3.4 Concentrations
The greases and lubricating oils used conform to MIL-G-24139 specifications and 2190TEP (MIL-L-17331) respectively. 1 

### Based on MSDS information, MIL-G-24139 grease contains 86% hydrotreated heavy paraffinic distillates, 6% clay, and 4% fatty acid amides. Lubricating oil 2190 TEP contains greater than 99% heavy hydrotreated paraffinic distillates and less than 1% additives.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality standards. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loading

4.1.1 Oil

At Sea. A high estimate of the oil released by a ship at sea is one gallon of oil per day, as discussed in Section 3.2. It is also estimated that it takes 4 hours for a ship to cover the 12 n.m. transit zone. Therefore, during each transit (either into or out of port), one-sixth of a gallon of oil could be released. An AOE 1 Class ship averages 22 transits per year and an AS 36/39 Class ship averages 12 transits per year. Under this scenario, an AOE 1 Class ship could release (1/6)(22) = 3.7 gallons of oil and an AS 36/39 Class ship would release (1/6)(12) = 2.0 gallons of oil to the surrounding seawater each year. As stated in Section 2.3, two AOE 1 Class ships and 3 AS 36/39 Class ships have oil-lubricated bearings. The maximum estimated amount of oil

### Rudder Bearing Lubrication 6 released from Navy ships fleetwide per year within 12 n.m. would be (3.7)(2) + (2.0)(3) = 13.4 gallons. Using a specific gravity of 0.89 for oil (MSDS for 2190TEP), this translates into approximately 100 pounds per year (lbs/year).
Using the same logic for the MSC ships, eight T-AE 26 Class (8 transits) and eight TAFS 1 Class (14 transits), the total mass loading would be:

(1/6 gallons)(8 transits)(8 ships) + (1/8 gallons)(14 transits)(8 ships) =

29.3 gallons or 218 lbs/year

Therefore, the total mass loading at sea during transit would be 100 + 218 = 318 lbs/year. However, the actual release rates will be much less because all ships of a class will not leak oil at such high rates, for such a long period of time, at the same time.

In Port. A high estimate of the oil released by a ship in port is one pint per day, as discussed in Section 3.2. Assuming that each of the two AOE 1 Class and three AS 36/39 Class ships spend 183 days per year in port, the total amount of oil released would be (1 pint)(5 ships)(183 days/yr) = 915 pints or 114 gallons per year. This translates into approximately 846 lbs/year.
For the eight MSC ships, the total amount of oil released in port would be:

(1 pint)(8 ships)(183 days/year) = 1,460 pints/year, 183 gallons/year, or 1,360 lbs/year.

Therefore, the maximum estimated mass loading in port would be 846 + 1,360 = 2,206 lbs/year. However, the actual release rates are expected to be much less because all ships of a class will not leak oil at such high rates, for such a long period of time, at the same time.

4.1.2 Grease

Grease washout occur s only from grease-lubricated stave bearings and only when the ship is moving and the rudder is in use. When the ship is first constructed or when the bearings are overhauled, approximately 2 pounds of grease are used for the entire bearing. 1 

### During the required, biweekly lubrication of these bearings, the grease is topped-off to replenish the amountlost while cruising at sea and, therefore, less than 2 pounds are used. Specifications for MIL-G24139 grease require that no more than 5 percent of the grease may wash out when tested in accordance with the ASTM D-1264 method. It was estimated that for every two weeks underway (in accordance with the biweekly maintenance requirement), 5 percent of the grease is washed out and is subsequently replenished. Therefore, a maximum of 0.1 pounds of grease (5% of 2 lbs.) are estimated to be washed out every two weeks underway.
Since the release of grease only occurs through erosion while the ship is moving through the water, discharges of grease are not expected in port. The 0.1-pound biweekly washout estimate can be used to calculate the grease washed out per transit. Based on vessel monitoring data, each vessel, on average, makes 24 transits a year within the 12 n.m. zone. 8 

### Each round trip

### Rudder Bearing Lubrication 7 transit (including inbound and outbound transits) lasts approximately 8 hours (0.024 weeks). Therefore, on each transit, 0.0024 pounds of grease could be discharged (i.e. 0.1 pounds per week multiplied by 0.024 weeks). Fleetwide, for the 56 vessels that have stave bearings, the mass loading would be 3.23 pounds (0.0024 pounds per transit x 24 transits per vessel x 56 vessels) within the 12 n.m. zone.

4.2 Environmental Concentrations

4.2.1 Lubricating Oil

At Sea. An estimate was made of the amount of water swept by an AOE 1 Class ship while in transit. Any rudder bearing oil leaking while underway will be churned into this volume by the propellers. An AOE 1 Class ship is 107 feet wide. For a draft (depth of ship bottom) of 39 feet and a length of 12 n.m. (72,960 feet), the total volume of water swept is (107)(39)(72,960) = 304 million cubic feet or 8 billion liters. Therefore, on each transit through the 12 n.m. zone, for each AOE 1 Class ship, one-sixth of a gallon of oil (i.e., 630 mL) is released in 8 billion liters of seawater. Using a specific gravity of 0.89 for oil (MSDS for 2190TEP), this translates into a maximum estimated concentration of 7 x 10 -5 

### milligrams per liter (mg/L).
A similar estimate can be made for an AS 36/39 Class ship that is 85 feet wide. For a draft of 25.5 feet and a length of 12 n.m. (72,960 feet), the total volume of water swept is (85)(25.5)(72,960) = 158 million cubic feet or 4.5 billion liters. Therefore, on each transit through the 12 n.m. zone, for each AS 36/39 Class ship, one-sixth of a gallon of oil (i.e., 630 mL) is released in 4.5 billion liters of seawater. This translates into a maximum estimated concentration of 1.2 x 10 -4 

### mg/L.
MSC ships with oil-lubricated rudder bearings (T-AE 26 and T-AFS 1 Classes) have an average width of 80 feet and an average draft of 26 feet. Therefore, as calculated above for the Navy ships, the oil concentration resulting from these ships would be approximately 1.3 x 10 -4 

### mg/L.

In Port. While in port the ship is stationary. Any oil that leaks from the rudder bearings will be mixed continuously with the water surrounding the rudder stock at the stern of the ship. The leakage of oil will be continuous over the day, so if the maximum allowable release of one pint daily (.125 gallons) were divided by 1440 minutes per day, the discharge rate would be 8.68 x 10 -5 

### gallons per minute. It is assumed that local currents will displace 5 cubic feet of water (37.4 gallons) from the area around the rudder stock at least once per minute. Calculating the concentration of oil within the volume displaced during one minute yields a local concentration of about 2.1 mg/L.

4.2.2 Grease
Because grease-lubricated stave bearings are installed in several vessel classes, a vessel width of 80 feet and a draft of 25 feet were assumed in the calculations. Following calculations

### Rudder Bearing Lubrication 8 similar to the ones in Section 4.2.1, the total volume of water swept would be 255 million cubic feet or 7 billion liters. As calculated in Section 4.1, a maximum of 0.0024 pounds (or 1.1 grams) of grease is released during each trip. This translates into a concentration of 1.6 x 10 -10 

### mg/L.

Based on the environmental concentrations estimated in Sections 4.2.1 and 4.2.2 above, a high estimate of the oil and grease concentration in the surrounding water would be 1.3 x 10 -4 

### mg/L at sea, and 2.1 mg/L in port. These concentrations do not exceed federal discharge standards or the most stringent state water quality criteria, as shown in Table 5.

4.3 Potential for Introducing Non-Indigenous Species
There is no potential for the transport of non-indigenous species since seawater is not taken aboard or discharged.

5.0 CONCLUSIONS
The rudder bearing lubrication discharge has a low potential for causing an adverse environmental effect because the concentrations of oil and grease in the environment from rudder bearing lubrication while the ship is within the 12 n.m. zone are below relevant federal discharge standards and state water quality criteria.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources were obtained. Process information and assumptions were used to estimate the rate of discharge. Based on this estimate and on the reported concentrations of oil and grease components, the concentrations of oil and grease in the environment resulting from this discharge were then estimated. Table 6 lists the data sources used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes. Rudder Bearing Lubrication Leakage. September 26, 1996.

2. UNDS Round 2 Equipment Expert Meeting Minutes. Rudder Bearing Lubrication Leakage. March 6, 1997.

3. Personal communication between Penny Weersing (MSC) and David Eaton (MR&S) concerning Action Item RT1. April 16, 1997.

4. Personal communication between Rich Machinsky (MSC) and Dick Soule (MR&S). April 9, 1998.

### Rudder Bearing Lubrication 9 5. Personal communication between LT Joyce Aivalotis (USCG) and David Eaton (MR&S). May 2, 1997.

6. Report of April 1997 Trip to USCG, Baltimore to Research Rudder Bearings on USCG Small Boats and Craft. January 13, 1998.

7. Patty’s Industrial Hygiene & Toxicology, 3rd Ed., Volume 2B. 1981. John Wiley & Sons, New York, pp 3369, 3397.

8. Pentagon Ship Movement Data for Years 1991-1995. March 4, 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.

### Rudder Bearing Lubrication 10 Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Rudder Bearing Lubrication 11 Figure 1. Rudder Grease-Lubricated Roller Bearings Generic Sketch

### Rudder Bearing Lubrication 12 Figure 2. Rudder Oil-Lubricated Roller Bearings Generic Sketch

### Rudder Bearing Lubrication 13 Figure 3. Rudder Stave Bearings (Example)

### Rudder Bearing Lubrication 14 Table 1. Navy Ships - Lower Rudder Bearing Type and Lubrication Method

Ship Class Lower Rudder Bearing &

Type of Lubrication # in Class AGF 3 Stave Brg., Grease 1 AGF 11 Stave Brg., Grease 1 AO 177 Roller Brg., Grease 13 AOE 1 Roller Brg., Oil/Grease 2/2 AOE 6 Stave Brg., Grease 3 ARS 50 Stave Brg., Grease 4 AS 36/39 Roller Brg., Oil 3 ATS 1 Stave Brg., Grease 3 CG 47 Roller Brg., Grease 27 CGN 36 Stave Brg., Water 2 CGN 40 Stave Brg., Water 1 CV 62 Stave Brg., Water 1 CV 63 Stave Brg., Water 2 CV 67 Stave Brg., Water 1 CVN 65 Stave Brg., Water 1 CVN 68 Stave Brg., Water 7 DD 963 Roller Brg., Grease 31 DDG 51 Roller Brg., Grease 18 DD 993 Roller Brg., Grease 4 FFG 7 Roller Brg., Grease 43 LCC 19 Stave Brg., Grease 2 LHA 1 Roller Brg., Grease 5 LHD 1 Roller Brg., Grease 4 LPD 4 Stave Brg., Grease 9 LPH 2 Stave Brg., Grease 2 LSD 36 Stave Brg., Grease 5 LSD 41 Stave Brg., Grease 11 MCM 1 Stave Brg., Grease 14 MCS 12 Stave Brg., Grease 1

223

### Rudder Bearing Lubrication 15 Table 2. U.S. Coast Guard Cutters, Types of Bearing, and Lubrication

Cutter Class No. in Class Type of Bearing Lubrication 399 WAGB 2 Laminated Phenolic Staves Grease 378 WHEC 12 Micarta Bushing Flax Packing/Grease 270 WMEC 13 Bushings Grease/Water 210 WMEC 16 Micarta Bushing Grease 140 WTGB 9 Staves Water

Note: There is no information available on the following classes:

225 WLB New production 175 WLM New production 180 WLB Decommissioned by 2001 157 WLM Decommissioned by 2000 133 WLM Decommissioned by 2000 160 WLIC No information

### Rudder Bearing Lubrication 16 Table 3. U.S. Coast Guard Small Boats and Craft (Types of Bearings and Lubrication)

Vessel/Craft Type Upper Rudder Bearing Method of

Lubrication Lower Rudder

Bearing Method of

Lubrication

26' MSB motor surfboat Thordon SXL bushing self Thordon SXL bushing water

32' PWB ports & waterways boat Delrin or nylon bushing self Delrin or nylon bushing water

44' MLB(S) motor lifeboat (steel) Micarta bushing self Micarta bushing water

47' MLB motor lifeboat Thordon SXL self Thordon SXL bushing water
52' MLB(S) motor lifeboat (steel) ball bearing grease Micarta bushing water

55' ANB aid to navigation boat metal bushing grease metal bushing grease

65' WLR river buoy tender spherical roller bearing grease Goodrich cutless bearing water

65' WYTL tug boat (steel) roller bearing grease Micarta bushing water

75' WLIC inland construction tender spherical roller bearing grease bronze bushing grease

75' WLR river buoy tender spherical roller bearing grease Thordon XL bushing water

82' WPB patrol boat spherical roller bearing grease Micarta bushing water

110' WPB patrol boat spherical roller bearing grease bushing water

### Rudder Bearing Lubrication 17 Table 4. Military Sealift Command Ships (Type of Rudder Bearings and Lubrication)

SHIP CLASS/NAME APL BEARING TYPE/LUBRICATION ALLOWABLE SEAL LEAKAGE WATER OR OIL REMARKS

UPPER & LOWER RUDDER STOCK PINTLE BEARING T-AE 26/ USNS KILAUEA 319010122 ROLLER BEARING/ OIL STAVE/ WATER 1 PINT/DAY IN PORT/ANCHOR.

1 GALLON/DAY UNDERWAY RUDDER POST HAS NEW JOHN CRANE SPLIT SEAL INSTALLED DURING YARD PERIOD T-AFS 1/ USNS MARS 319010106 ROLLER BEARING/OIL

T-AG 194/ USNS VANGUARD NO DATA AVAILABLE

T-AGM 22/ USNS RANGE SENTINEL NO DATA AVAILABLE

T-AGOS 21/ USNS EFFECTIVE AEROSHELL GREASE 6SG6127 70026 1 PINT/DAY IN PORT/ANCHOR. 1 QUART/DAY FOR ALL OPERATING CONDITIONS T-AGS 45/ USNS WATERS M319010192 ROLLER/GREASE STAVE/ WATER 1 PINT/DAY IN PORT /ANCHOR.

1 GAL./DAY FOR ALL OPERATING CONDITIONS. T-AGS 60/ USNS PATHFINDER N.A N.A N.A N.A. THIS CLASS HAS “ZEE” DRIVES . THERE ARE NO RUDDERS. T-AH 19/ USNS MERCY NO DATA AVAILABLE T-AO 187/ USNS HENRY J. KAISER ROLLER/GREASE 1 PINT/DAY IN PORT/ANCHOR. 1 QUART/DAY FOR ALL OPERATING CONDITIONS T-ARC 7/ USNS ZEUS NO DATA AVAILABLE

T-ATF 166/ USNS POWHATAN NO DATA AVAILABLE



### The blank spaces in the table indicate that information is not available.

### Rudder Bearing Lubrication 18 Table 5. Comparison of Environmental Concentration with Relevant Water Quality Criteria (mg/L)

Constituent Concentration Federal Discharge Standard Most Stringent State Water

Quality Criteria oil and grease 1.3 x 10 -4 

### (at sea)

2.1 (in port) visible sheen a 

### /15 b 

### 5.0 (FL)

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995)

a Discharge of Oil , 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. b International Convention for the Prevention of Pollution from Ships (MARPOL 73/78) as implemented by the Act to Prevent Pollution from Ships (APPS)



### Table 6. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents X X 3.4 Concentrations X X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X X

### Seawater Cooling Overboard Discharge 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Seawater Cooling Overboard Discharge

### Seawater Cooling Overboard Discharge 2 2.0 DISCHARGE DESCRIPTION
This section describes discharges from seawater cooling systems and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Seawater cooling systems on surface ships and submarines provide cooling water for heat exchangers, removing heat from the propulsion plant and mechanical auxiliary systems. Heat exchangers are provided for steam, diesel, and gas turbine propulsion plants and electric generating plants; air-conditioning (A/C) plants; air compressors; and electronic equipment. Seawater is provided to steam propulsion plants for the purpose of condensing exhausted steam from propulsion or electric generator turbines before the condensate is cycled back to boilers or steam generators.
Seawater cooling systems draw seawater either directly from hull connecti ons (sea chests), or indirectly from the firemain that is supplied directly from a hull connection. The seawater is pumped through heat exchangers where it absorbs heat and is then discharged overboard at a higher temperature. At sea, the demands for seawater cooling are higher than pierside or at anchor because systems requiring seawater cooling tend to be in use and at a higher power output level while underway. Even while pierside, however, the demands for cooling of auxiliary systems may be significant. Conventional steam vessels were estimated to have a 24- hour start-up and securing cycle and nuclear vessels a 48-hour start-up and securing cycle. 1



### Typically, the demand for cooling water is continuous. The residence time of seawater in seawater cooling systems is relatively short, perhaps a minute or two for most portions of the cooling system. Some branch piping, however, may have relatively long residence times due to inactivity of equipment. 2



### Seawater cooling systems are designed to minimize flow-induced erosion of the piping system. The piping systems, where possible, have geometry (e.g., increase turn or elbow radii) or sizing to minimize turbulent flow. The materials of construction (e.g., copper, nickel, and titanium) are selected because of their resistance to seawater corrosion. Sea chests, heat exchangers, and other components could also contain sacrificial material such as waster pieces or zinc anodes to protect the system from corrosion.
Many boats and craft such as utility landin g craft and rigid inflatable boats use keel coolers or stern flushing tubes. 1 

### Keel coolers use ship’s motion to pass water over exposed heat transfer coils in a recessed area of the boat keel. Stern flushing tubes are simple cooling systems in which engine cooling water is drawn from a hull connection and is discharged from the vessel’s stern, normally above the water line.

### Seawater Cooling Overboard Discharge 3 Sea chests and hull connections are equipped with sea strainer plates to prevent debris from entering the seawater cooling system (especially when in port or in coastal waters) and causing failures due to clogging. 3 

### The openings in these strainer plates vary in diameter from 1/4 inch to 1-1/2 inches and require periodic blowdowns to prevent clogging. This is accomplished by blowing low-pressure air or steam out through the plates. 3



### Some vessels add biofouling prevention chemicals to the seawater. 1,4 

### The contribution of anti-fouling additives to seawater cooling overboard discharge is addressed in the Seawater Piping Biofouling Prevention NOD report and will not be considered in this report.
In addition to seawater cooling while pierside, Navy vessels with non-conventional steam propulsion also fill their main steam condenser heat exchangers with fresh water if the vessel is going to be in port for an extended period. When vessels are in port for an extended period of time, they often deactivate their propulsion plants. During these periods, the main condenser is filled with fresh water because fresh water inhibits biofouling. 1 

### Freshwater layups for nonconventional main steam condenser heat exchangers are discussed in the Freshwater Layup NOD report.

2.2 Releases to the Environment
The releases to the environment consist of the seawater discharged overboard from the seawater cooling system with entrained or dissolved materials from the components of the seawater cooling system and bottom sediments that are brought onboard through the sea chest. The components of the seawater cooling system include: the sea chest, pumps, heat exchangers, pipes, fittings, and valves. The sea chests are constructed of steel and are painted with high durable epoxy paints, and they also contain steel or zinc sacrificial material. 1 

### The pumps are constructed of titanium, stainless steel, nickel alloys, bronze, and non-metallic composites. 1 

### Heat exchangers are copper-nickel alloys or titanium. 1 

### The pipes and fittings in seawater systems are primarily copper-nickel alloys, but fittings may also be bronze with silver-brazed joints. 1 

### Valves are constructed of bronze, nickel alloys, or aluminum alloys. 1 

### Some traces of hydraulic oil or other lubricants may enter the seawater from remotely operated valves or pumps. The metals that may enter the seawater include copper, nickel, lead, aluminum, tin, silver, iron, titanium, chromium, and zinc.
In addition, the discharge constitutes a thermal load. The maximum discharge temperature is 140 degrees Fahrenheit ( ° F) to prevent formation of soft scale (calcium carbonate) inside the pipes and heat exchangers. 1 

### The difference in temperature from influent to effluent is usually between 10 ° F to 15 ° F, but the range can be as much as 5 ° F to 25 ° F. 5



### Sea strainer plate blowdown consists of air or steam, and any solids blown off the strainer plate. Air bubbles rise to the surface and dissipate, while the solids fall to the bottom. Solids can include anything that has been held against the plate by the cooling water suction (e.g., debris and mud) plus biota that has grown on the plate over time (e.g., sea grass and slime).

2.3 Vessels Producing the Discharge

### Seawater Cooling Overboard Discharge 4 Ships, boats, and craft in the Navy, Military Sealift Command (MSC), U.S. Coast Guard (USCG), Army, and Air Force with the exception of some non -self propelled service craft such as barges, use seawater for cooling. Of the over 6,000 ships, boats, and craft in the Armed Forces, the vast majority of these vessels (over 5,000) consists of boats and craft. The majority of the seawater cooling overboard discharge, however, is generated by larger ships and vessels that have large, continuous seawater cooling demands. There are 673 such surface ships and submarines. The boats and craft in service use either intermittent cooling water or have keel coolers where there is no flow through the vessel. Table 1 lists the vessels that contribute to this discharge and the estimates for the number of transits, number of days in port, and number of days operating within 12 nautical miles (n.m.) by each ship class each year.

3.0 DISCHARGE CHARACTERISTICS

This sect ion contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
This discharge occurs both within and beyond 12 n.m. of shore.

3.2 Rate
Seawater cooling flow rates can vary from several gallons per minute (gpm) for smaller, diesel-powered ships to flows of greater than 170,000 gpm for aircraft carriers during full-power steaming. While transiting, vessels tend to operate at levels sufficient to maintain steering control and do not require the maximum amount of seawater cooling. While anchored or pierside, seawater cooling flow rates are at their lowest because only certain auxiliary equipment is required. Table 2 lists examples of typical pierside and transit steaming flow rates for vessel classes. 6



### Tables 3a, 3b, and 3c provide estimates of discharge flow rates for various ship classes within 12 n.m. of shore based on available data. The number of transits were used to estimate the number of light-off and securing cycles for steam-powered vessels. The calculations use a typical transit time of 4 hours between 0 to 12 n.m. 7 

### For USCG vessels, operation within 12 n.m. of shore includes seawater cooling flow rates at pierside rates for 16 hours each day with the remaining 8 hours at typical underway flow rates. An example for the estimated annual flow of the WAGB 399 Class for operation within 12 n.m. of shore is calculated by the equation:

### Seawater Cooling Overboard Discharge 5 Based on these estimates, the total annual flow of seawater cooling overboard discha rge from Navy, MSC, Army, and USCG vessels is estimated as 390 billion gallons. Flow rates for Air Force vessels are not estimated.

3.3 Constituents
Seawater cooling overboard discharge is primarily seawater that contains trace materials from seawater cooling system pipes, fittings, valves, seachests, pumps, and heat exchangers. The expected constituents of seawater cooling discharge include copper, iron, aluminum, zinc, nickel, tin, titanium, arsenic, manganese, chromium, lead, and possibly oil and grease from valves and pumps. Of the constituents expected to be present in this discharge, arsenic, chromium, copper, lead, nickel, and zinc are priority pollutants. None of the expected constituents is a bioaccumulator.
The constituents from strainer plate blowdown include the material ejected from the strainer plate, such as biota, mud, or debris, trapped from the sea or harbor waters.

3.4 Concentrations
Influent and effluent samples were collected from the seawater cooling systems of five ships. 8 

### A summary of the analytical results are presented in Table 4. This table shows the constituents, the log-normal mean, the frequency of detection for each constituent, the minimum and maximum concentrations, and the mass loadings of each constituent. For the purposes ofcalculating the log-normal mean, a value of one-half the detection limit was used for nondetected results.
The analytical data for a Coast Guard vessel were not used to calculate the log-normal mean concentrations in Table 4 because the data indicated a large average net decrease in effluent concentrations for total copper, nickel, tin, and zinc. For example, data for this vessel varied widely for total copper with an average influent concentration of 1,450 μ g/L and an average effluent concentration of 419 μ g/L, a net decrease of 1,031 μ g/L. These concentrations are one to two orders of magnitude higher than data from the other ships. The Coast Guard vessel data were considered an anomaly and were excluded from log-normal mean concentration calculations to avoid biasing the data with large, negative net concentrations.
Variability is expected within this discharge as a result of several factors including material erosion and corrosion, residence times, passive films, and influent water variability. Pipe erosion is caused by high fluid velocity, or by abrasive particles entrained in the seawater

Estimated Annual Flows (gal), Operating Within 12 n.m. = (Qty)(Operating Time)(60) [(16/24)(Pierside Flow) + (8/24)(Operating Flow)]

WAGB 399 Annual Flow (gal), Operating Within 12 n.m. = (2)(2400 hrs)(60 min/hr) [(16/24)(800 gal/min) + (8/24)(4000)]

= 537,600,000 gal

### Seawater Cooling Overboard Discharge 6 flowing at any velocity. In most cases of pipe erosion, the problematic high fluid velocity is a local phenomenon, such as would be caused by eddy turbulence at joints, bends, reducers, attached mollusks, or tortuous flow paths in valves. Passive films inhibit metal loss due to erosion. Corrosion is influenced by the residence time of seawater in the system, temperature, biofouling, constituents in the influent, and the presence or absence of certain films on the pipe surface. All of these influences on metallic concentrations are variable within a given ship over time, and between ships.

4.0 NATURE OF DISCHARGE ANALYSIS

Based on the dis charge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria.Section 4.3 discusses thermal effects. In Section 4.4, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Based on the discharge volume estimates developed in Tables 3a, 3b and 3c and the lognormal mean discharge concentrations and mass loadings are presented in Table 4. Table 5 is present in order to highlight constituents with log-normal mean concentrations that exceed water quality criteria (WQC). A sample calculation of the estimated annual mass loading for copper is shown here:

Mass Loading for Copper (Total)

Mass Loading = (Net Positive Log-normal Mean Concentration)(Flow Rate) (34.49 μ g/L)(3.785 L/gal)(390,000,000,000 gal/yr)(2.202 lbs/kg)(10 -9 

### kg/ μ g) ≅ 112,100 lbs/yr

4.2 Environmental Concentrations
The log-normal mean discharge concentrations are compared to the Federal and most stringent state WQC in Table 6. Copper exceeds the Federal and most stringent state WQC. This can be attributed to two factors: 1) the copper concentrations of many harbors exceed the standard, and 2) other copper sources (e.g. copper hull coatings) of the vessel are located near the influent sea chest. Between 1 and 90 μg/L of copper naturally occurs in seawater. 9 

### Nickel and silver concentrations also exceed the Federal and most stringent state WQC. Nitrogen (as ammonia, nitrate/nitrite, and total kjeldahl nitrogen) exceeds the most stringent state WQC.

4.3 Thermal Effects
The potential for seawater cooling overboard discharge to cause thermal environmental effects was evaluated by modeling the thermal plume generated under conditions tending to produce the greatest temperature rise and then compared to state plume thermal discharge

### Seawater Cooling Overboard Discharge 7 requirements. Thermal effects of seawater cooling water overboard discharge were modeled using the Cornell Mixing Zone Expert System (CORMIX) to estimate the plume size and temperature gradients in the receiving water body. Thermal modeling was performed for three ships in three harbors (Mayport, FL; Norfolk, VA; and Bremerton, WA) to assess the potential thermal impact. The discharge was also assumed to occur during winter when the ambient water temperatures are lowest. Based on these models, Navy aircraft carriers are predicted to generate thermal plumes that, under conditions of low harbor flushing, low wind velocities, and maximum cooling water flow rates, would exceed the regulatory limits of Washington. 5 

### Thermal plumes from models of smaller ships (destroyers) do not exceed regulatory limits. 5 

### Of the five states having a substantial presence of Armed Forces’ vessels, only Virginia and Washington have established thermal mixing zone dimensions.

4.4 Potential for Introducing Non-Indigen ous Species
The seawater cooling water system has a minimal potential for transporting nonindigenous species, because the residence times for most portions of the system are short. Some portions of the seawater system lie stagnant where marine organisms may reside. However, these areas tend to develop anaerobic conditions quickly, except at the junctions with the active portions of the system, where oxygenated water continuously flows by and through the ship. The seawater is not a system where large volumes of water, under aerobic conditions, are transported over distances.
A small potential exists for transport of non-indigenous species because the blowdown procedure for the strainer plates may dislodge biota that has grown on the plate over time.

5.0 CONCLUSION
Seawater cooling overboard discharge has a potential to cause an adverse environmental effect because:

1) Nitrogen, copper, nickel, and silver concentrations in the discharge exceed Federal and the most stringent state water quality criteria, and the mass loadings of nitrogen, copper, nickel, and silver are significant; and

2) Some vessels could exceed some states’ thermal mixing zone requirements while in port.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. System engineering information was used to estimate the rate of discharge. Table 7 shows the sources of data used to develop this NOD report.

### Seawater Cooling Overboard Discharge 8 Specific References

1. UNDS Equipment Expert Meeting Minutes. Seawater Cooling Water Overboard . 27 August 1996.

2. Worris, Matthew, M. Rosenblatt & Son, Inc. Seawater Cooling Residence Times, Pierside and Underway, 16 October 1996, Clarkson Meredith, Versar, Inc.

3. Tsao, Fred, NAVSEA 03L32. Sea Strainer Blowdown, 21 December 1996, Clarkson Meredith, Versar, Inc.

4. Weersing, Penny, Military Sealift Command Point Paper: Supplemental Information About Wastestreams from Seawater Cooling Systems.

5. NAVSEA. Thermal Effects Screening of Discharges from Vessels of the A rmed Services. Versar, Inc. July 3, 1997.

6. Worris, Matthew, M. Rosenblatt & Son, Inc. Seawater Cooling Flow Rates, Pierside and Underway, 30 September 1996, Clarkson Meredith, Versar, Inc.

7. Pentagon Ship Movement Data for Years 1991 - 1995, 4 March 1997.

8. UNDS Phase I Sampling Data Report, Volumes 1-13, October 1997.

9. Van der Leeden, et al. The Water Encyclopedia, Second Edition. Lewis Publishers, 1990.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.

### Seawater Cooling Overboard Discharge 9 Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. 23 March 1995.
UNDS Ship Database, August 1, 1997.

### Seawater Cooling Overboard Discharge 10 Table 1. Typical Ship Movement Data

Vessel Class Quantity Number of Transits/Vessel/Year Hours per Transit Days in

Port/Vessel/Year Days Operating

within 12 n.m. Surface Ships, Submarines Forrestal Class Aircraft Carriers CV 59 1 6 4 143 0 Kitty Hawk Class Aircraft Carriers CV 63 3 7 4 137 0 Enterprise Class Aircraft Carriers CVN 65 1 6 4 76 0 Nimitz Class Aircraft Carriers CVN 68 7 7 4 147 0 Ticonderoga Class Guided Missile Cruisers CG 47 27 12 4 166 0 California Class Guided Missile Cruisers CGN 36 2 11 4 143 0 Virginia Class Guided Missile Cruisers CGN 38 1 11 4 161 0 Spruance Class Destroyers DD 963 31 12 4 178 0 Arleigh Burke Destroyers DDG 51 18 11 4 101 0 Kidd Class Destroyers DDG 993 4 12 4 175 0 Oliver Hazard Perry Guided Missile Frigates FFG 7 43 13 4 167 0 Submarines, SSN, SSBN, All Classes 89 6 4 183 0 Blue Ridge Class Amphibious Command Ships LCC 19 2 8 4 179 0 Wasp Class Amphibious Assault Ships LHD 1 4 13 4 185 0 Tarawa Class Amphibious Assault Ships LHA 1 5 9 4 173 0 Iwo Jima Class Amphibious Assault Ships LPH 2 2 11 4 186 0 Austin Class Amphibious Transport Docks LPD 4 3 11 4 178 0 Amphibious Transport Docks LPD 7 3 12 4 188 0 Amphibious Transport Docks LPD 14 2 11 4 192 0 Anchorage Class Dock Landing Ships LSD 36 5 13 4 215 0 Whidbey Island Class Dock Landing Ships LSD 41 8 13 4 170 0 Harpers Ferry Class Dock Landing Ships LSD 49 3 13 4 215 0 Avenger Class Mine Countermeasures Vessels MCM 1 14 28 4 232 0 Osprey Class Coastal Minehunters MHC 51 12 28 4 232 0 Cyclone Class Coastal Defense Ships PC 1 13 18 4 105 0

Auxiliaries Emory S Land Class Submarine Tenders AS 39 3 6 4 293 0 Simon Lake Class Submarine Tender AS 33 1 6 4 229 0 Command Ships AGF 2 12 4 183 0 Jumboised Cimarron Class Oilers AO 177 5 10 4 188 0 Sacramento Class Fast Combat Support Ships AOE 1 4 11 4 183 0

### Seawater Cooling Overboard Discharge 11 Supply Class Fast Combat Support Ships AOE 6 3 6 4 114 0 Safeguard Class Salvage Ships ARS 50 4 22 4 208 0 Gyre Class Oceanographic Research Ships AGOR 21 1 11 4 113 0 T.G.Thompson Oceanographic Research Ships AGOR 23 2 11 4 113 0

Military Sealift Command Kilauea Class Ammunition Ships AE 26 8 4 4 26 0 Mars Class Combat Stores Ships AFS 1 8 7 4 148 0 Missile Range Instrumentation Ships AGM 22 1 4 4 133 0 Mercy Class Hospital Ships AH 19 2 2 4 184 0 Zeus Class Cable Repairing Ships ARC 7 1 2 4 8 0 Mission Class Navigation Research Ships AG 194 2 10 4 151 0 Stalwart Class Ocean Surveillance Ships AGOS 1 5 4 4 70 0 Victorious Class Ocean Surveillance Ships AGOS 19 4 5 4 107 0 Silas Bent & Wilkes Classes Surveying Ships AGS 26 2 6 4 44 0 Waters Class Surveying Ship AGS 45 1 1 4 7 0 John McDonnell Class Surveying Ships AGS 51 2 6 4 96 0 Pathfinder Class Surveying Ships AGS 60 4 6 4 96 0 Algol Class Vehicle Cargo Ships AKR 287 8 3 4 109 0 Maersk Class Fast Sealift Ships AKR 295 3 9 4 59 0 Henry J. Kaiser Class Oilers AO 187 13 6 4 78 0 Potawan Class Fleet Ocean Tugs ATF 166 7 16 4 127 0

US Coast Guard High Endurance Cutters WHEC 378 12 13 4 151 0 Medium Endurance Cutters WMEC 213 1 9 4 98 0 Medium Endurance Cutter, WMEC 230 1 11 4 167 0 Medium Endurance Cutters WMEC 210A 5 13 4 235 0 Medium Endurance Cutters WMEC 210B 11 9 4 149 0 Medium Endurance Cutters WMEC 270A 4 6 4 137 0 Medium Endurance Cutters WMEC 270B 9 7 4 164 0 Mackinaw Class Icebreaker WAGB 290 1 4 4 215 146 Polar Class Icebreakers WAGB 399 2 4 4 148 100 Island Class Patrol Craft WPB 110 ( A,B & C ) 49 Point Class Patrol Craft WPB 82 ( C & D ) 36 Juniper Class Buoy Tenders WLB 225 2 18 4 190 100 Balsam Class Buoy Tenders WLB 180A 8 18 4 190 100 Balsam Class Buoy Tenders WLB 180B 2 5 4 120 200 Balsam Class Buoy Tenders WLB 180C 13 16 4 123 200

### Seawater Cooling Overboard Discharge 12 Bay Class Icebreaking Tugs WTGB 140 9 1 4 215 146 Inland Buoy Tender WLI 100A 1 0 0 160 201 Inland Buoy Tender WLI 100C 1 0 0 160 201 Inland Buoy Tenders WLI 65303 2 0 0 160 201 Inland Buoy Tenders WLI 65400 2 0 0 160 201 Cosmos Class Inland Construction Tenders WLIC 100 3 0 0 160 201 Anvil Class Inland Construction Tenders WLIC 75A 2 0 0 160 201 Inland Construction Tenders WLIC 75B 3 0 0 160 201 Clamp Class Inland Construction Tenders WLIC 75D 2 0 0 160 201 River Buoy Tender WLR 115 1 0 0 160 201 River Buoy Tenders WLR 75 13 0 0 160 201 River Buoy Tenders WLR 65 6 0 0 160 201 Pamlico Class Inland Construction Tenders WLIC 160 4 0 0 160 201 White Sumac Class Coastal Buoy Tenders WLM 157 9 16 4 123 100 Keeper Class Coastal Buoy Tenders WLM 551 2 16 4 123 200 65 ft. Harbor Tugs WYTL ( A, B, C & D ) 11 Army Logistics Support Vessel LSV 6 20 4 150 30 Landing Craft Utility LCU-2000 35 3 4 275 60 Large Tug LT-128 6 5 4 245 60

Total 673

### Seawater Cooling Overboard Discharge 13 Table 2. Seawater Cooling Flow Rates, Examples (Naval Vessels)

Vessel Class Pierside (gpm) In Transit (gpm) Aircraft carriers (CVN 68) 4,100 >170,000 Cruisers (CG 47) 1,650 7,000 Destroyers (DDG 51) 1,500 6,840 Frigates (FFG 7) 1,750 3,000 Amphibious assault ships (LHD 1) 3,000 up to 40,500

Submarines 2,000 10,000 - 12,000

### Seawater Cooling Overboard Discharge 14 Table 3a. Estimated Annual Flows, Seawater Cooling Water, Navy and MSC

Estimated Flow Rates (gpm) Estimated Times within 12 n.m. (hrs) Estimated Annual Flows (gal) Qty Pierside Start-up/

Securing In Transit Pierside Start-up/ Securing In Transit Pierside Start-up/ Securing In Transit

Surface Ships, Submarines Forrestal Class Aircraft Carriers CV 59 1 4,100 170,000 170,000 3,432 288 48 844,272,000 2,937,600,000 489,600,000 Kitty Hawk Class Aircraft Carriers CV 63 3 4,100 170,000 170,000 3,288 336 56 2,426,544,000 10,281,600,000 1,713,600,000 Enterprise Class Aircraft Carriers CVN 65 1 4,100 170,000 170,000 1,824 576 48 448,704,000 5,875,200,000 489,600,000 Nimitz Class Aircraft Carriers CVN 68 7 4,100 170,000 170,000 3,528 672 56 6,075,216,000 47,980,800,000 3,998,400,000 Ticonderoga Class Guided Missile Cruisers CG 47 27 1,650 0 7,000 3,984 0 96 10,649,232,000 0 1,088,640,000 California Class Guided Missile Cruisers CGN 36 2 1,650 7,000 7,000 3,432 1,056 88 679,536,000 887,040,000 73,920,000 Virginia Class Guided Missile Cruisers CGN 38 1 1,650 7,000 7,000 3,864 1,056 88 382,536,000 443,520,000 36,960,000 Spruance Class Destroyers DD 963 31 1,500 0 6,840 4,272 0 96 11,918,880,000 0 1,221,350,400 Arleigh Burke Destroyers DDG 51 18 1,680 0 6,840 2,424 0 88 4,398,105,600 0 650,073,600 Kidd Class Destroyers DDG 993 4 1,500 0 6,840 4,200 0 96 1,512,000,000 0 157,593,600 Oliver Hazard Perry Guided Missile Frigates FFG 7 43 1,750 0 3,000 4,008 0 104 18,096,120,000 0 804,960,000 Submarines, SSN, SSBN, All Classes 89 2,000 11,000 11,000 4,392 576 48 46,906,560,000 33,834,240,000 2,819,520,000 Blue Ridge Class Amphibious Command Ships LCC 19 2 3,000 * 40,500 40,500 * 4,296 384 64 1,546,560,000 1,866,240,000 311,040,000 Wasp Class Amphibious Assault Ships LHD 1 4 3,000 40,500 40,500 4,440 624 104 3,196,800,000 6,065,280,000 1,010,880,000 Tarawa Class Amphibious Assault Ships LHA 1 5 3,000 * 40,500 40,500 * 4,152 432 72 3,736,800,000 5,248,800,000 874,800,000 Iwo Jima Class Amphibious Assault Ships LPH 2 2 3,000 * 40,500 40,500 * 4,464 528 88 1,607,040,000 2,566,080,000 427,680,000 Austin Class Amphibious Transport Docks LPD 4 3 3,000 * 40,500 40,500 * 4,272 528 88 2,306,880,000 3,849,120,000 641,520,000 Amphibious Transport Docks LPD 7 3 3,000 * 40,500 40,500 * 4,512 576 96 2,436,480,000 4,199,040,000 699,840,000 Amphibious Transport Docks LPD 14 2 3,000 * 40,500 40,500 * 4,608 528 88 1,658,880,000 2,566,080,000 427,680,000 Anchorage Class Dock Landing Ships LSD 36 5 3,000 * 40,500 40,500 * 5,160 624 104 4,644,000,000 7,581,600,000 1,263,600,000 Whidbey Island Class Dock Landing Ships LSD 41 8 3,000 * 0 40,500 * 4,080 0 104 5,875,200,000 0 2,021,760,000 Harpers Ferry Class Dock Landing Ships LSD 49 3 3,000 * 0 40,500 * 5,160 0 104 2,786,400,000 0 758,160,000 Avenger Class Mine Countermeasures Vessels MCM 1 14 1,650 * 0 7,000 * 5,568 0 224 7,717,248,000 0 1,317,120,000 Osprey Class Coastal Minehunters MHC 51 12 1,500 * 0 6,840 * 5,568 0 224 6,013,440,000 0 1,103,155,200 Cyclone Class Coastal Defense Ships PC 1 13 200 * 0 1,500 * 2,520 0 144 393,120,000 0 168,480,000

Auxiliaries Emory S Land Class Submarine Tenders AS 39 3 2,000 * 40,500 40,500 * 7,032 288 48 2,531,520,000 2,099,520,000 349,920,000 Simon Lake Class Submarine Tender AS 33 1 2,000 * 40,500 40,500 * 5,496 288 48 659,520,000 699,840,000 116,640,000 Command Ships AGF 2 2,000 * 40,500 40,500 * 4,392 576 96 1,054,080,000 2,799,360,000 466,560,000 Jumboised Cimarron Class Oilers AO 177 5 2,000 * 40,500 40,500 * 4,512 480 80 2,707,200,000 5,832,000,000 972,000,000 Sacramento Class Fast Combat Support Ships AOE 1 4 1,650 * 7,500 7,500 * 4,392 528 88 1,739,232,000 950,400,000 158,400,000 Supply Class Fast Combat Support Ships AOE 6 3 1,650 * 0 7,500 * 2,736 0 48 812,592,000 0 64,800,000 Safeguard Class Salvage Ships ARS 50 4 1,500 * 0 6,840 * 4,992 0 176 1,797,120,000 0 288,921,600 Gyre Class Oceanographic Research Ships AGOR 21 1 1,500 * 0 6,840 * 2,712 0 88 244,080,000 0 36,115,200 T.G.Thompson Oceanographic Research Ships AGOR 23 2 1,500 * 0 6,840 * 2,712 0 88 488,160,000 0 72,230,400

### Seawater Cooling Overboard Discharge 15 Military Sealift Command Kilauea Class Ammunition Ships AE 26 8 2,000 * 40,500 40,500 * 624 192 32 599,040,000 3,732,480,000 622,080,000 Mars Class Combat Stores Ships AFS 1 8 2,000 * 40,500 40,500 * 3,552 336 56 3,409,920,000 6,531,840,000 1,088,640,000 Missile Range Instrumentation Ships AGM 22 1 2,000 * 40,500 40,500 * 3,192 192 32 383,040,000 466,560,000 77,760,000 Mercy Class Hospital Ships AH 19 2 2,000 * 40,500 40,500 * 4,416 96 16 1,059,840,000 466,560,000 77,760,000 Zeus Class Cable Repairing Ships ARC 7 1 2,000 * 0 40,500 * 192 0 16 23,040,000 0 38,880,000 Mission Class Navigation Research Ships AG 194 2 1,500 * 6,840 6,840 * 3,624 480 80 652,320,000 393,984,000 65,664,000 Stalwart Class Ocean Surveillance Ships AGOS 1 5 1,500 * 0 6,840 * 1,680 0 32 756,000,000 0 65,664,000 Victorious Class Ocean Surveillance Ships AGOS 19 4 1,500 * 0 6,840 * 2,568 0 40 924,480,000 0 65,664,000 Silas Bent & Wilkes Classes Surveying Ships AGS 26 2 1,500 * 0 6,840 * 1,056 0 48 190,080,000 0 39,398,400 Waters Class Surveying Ship AGS 45 1 1,500 * 0 6,840 * 168 0 8 15,120,000 0 3,283,200 John McDonnell Class Surveying Ships AGS 51 2 1,500 * 0 6,840 * 2,304 0 48 414,720,000 0 39,398,400 Pathfinder Class Surveying Ships AGS 60 4 1,500 * 6,840 6,840 * 2,304 288 48 829,440,000 472,780,800 78,796,800 Algol Class Vehicle Cargo Ships AKR 287 8 2,000 * 0 40,500 * 2,616 0 24 2,511,360,000 0 466,560,000 Maersk Class Fast Sealift Ships AKR 295 3 2,000 * 0 40,500 * 1,416 0 72 509,760,000 0 524,880,000 Henry J. Kaiser Class Oilers AO 187 13 2,000 * 0 40,500 * 1,872 0 48 2,920,320,000 0 1,516,320,000 Potawan Class Fleet Ocean Tugs ATF 166 7 1,650 * 0 7,500 * 3,048 0 128 2,112,264,000 0 403,200,000

-------- ----------------------- ----------------------- --------------------- 399 177,600,801,600 160,627,564,800 32,269,468,800

* - These flow rates are estimated based on the mission and the size ship in relation to ships whose flow rates are known. Seawater Cooling Total: 370,497,835,200

### Seawater Cooling Overboard Discharge 16 Table 3b. Estimated Annual Flows, Seawater Cooling Water, USCG

Estimated Flow Rates (gpm) Estimated Times within 12 n.m. (hrs) Estimated Annual Flows (gal)

Qty Pierside Operating within 12 n.m. In Transit Pierside Operating In Transit Pierside Operating within 12 n.m. In Transit US Coast Guard High Endurance Cutters WHEC 378 12 1,200 * 6,000 6,000 * 3,624 0 104 3,131,136,000 0 449,280,000 Medium Endurance Cutters WMEC 213 1 800 * 4,000 4,000 * 2,352 0 72 112,896,000 0 17,280,000 Medium Endurance Cutter, WMEC 230 1 800 * 4,000 4,000 * 4,008 0 88 192,384,000 0 21,120,000 Medium Endurance Cutters WMEC 210A 5 800 * 4,000 4,000 * 5,640 0 104 1,353,600,000 0 124,800,000 Medium Endurance Cutters WMEC 210B 11 800 * 4,000 4,000 * 3,576 0 72 1,888,128,000 0 190,080,000 Medium Endurance Cutters WMEC 270A 4 800 * 4,000 4,000 * 3,288 0 48 631,296,000 0 46,080,000 Medium Endurance Cutters WMEC 270B 9 800 * 4,000 4,000 * 3,936 0 56 1,700,352,000 0 120,960,000 Mackinaw Class Icebreaker WAGB 290 1 1,000 * 5,000 5,000 * 5,160 3,504 32 309,600,000 490,560,000 9,600,000 Polar Class Icebreakers WAGB 399 2 800 * 4,000 4,000 * 3,552 2,400 32 340,992,000 537,600,000 15,360,000 Island Class Patrol Craft WPB 110 ( A,B & C ) 49 Point Class Patrol Craft WPB 82 ( C & D ) 36 Juniper Class Buoy Tenders WLB 225 2 800 * 4,000 4,000 * 4,560 2,400 144 437,760,000 537,600,000 69,120,000 Balsam Class Buoy Tenders WLB 180A 8 100 * 500 500 * 4,560 2,400 144 218,880,000 268,800,000 34,560,000 Balsam Class Buoy Tenders WLB 180B 2 100 * 500 500 * 2,880 4,800 40 34,560,000 134,400,000 2,400,000 Balsam Class Buoy Tenders WLB 180C 13 100 * 500 500 * 2,952 4,800 128 230,256,000 873,600,000 49,920,000 Bay Class Icebreaking Tugs WTGB 140 9 100 * 500 500 * 5,160 3,504 8 278,640,000 441,504,000 2,160,000 Inland Buoy Tender WLI 100A 1 50 * 50 50 * 3,840 4,824 0 11,520,000 14,472,000 0 Inland Buoy Tender WLI 100C 1 50 * 50 50 * 3,840 4,824 0 11,520,000 14,472,000 0 Inland Buoy Tenders WLI 65303 2 50 * 50 50 * 3,840 4,824 0 23,040,000 28,944,000 0 Inland Buoy Tenders WLI 65400 2 50 * 50 50 * 3,840 4,824 0 23,040,000 28,944,000 0 Cosmos Class Inland Construction Tenders WLIC 100 3 50 * 50 50 * 3,840 4,824 0 34,560,000 43,416,000 0 Anvil Class Inland Construction Tenders WLIC 75A 2 50 * 250 250 * 3,840 4,824 0 23,040,000 67,536,000 0 Inland Construction Tenders WLIC 75 3 50 * 50 50 * 3,840 4,824 0 34,560,000 43,416,000 0 Clamp Class Inland Construction Tenders WLIC 75D 2 50 * 50 50 * 3,840 4,824 0 23,040,000 28,944,000 0 River Buoy Tender WLR 115 1 50 * 50 50 * 3,840 4,824 0 11,520,000 14,472,000 0 River Buoy Tenders WLR 75 13 50 * 50 50 * 3,840 4,824 0 149,760,000 188,136,000 0 River Buoy Tenders WLR 65 6 50 * 50 50 * 3,840 4,824 0 69,120,000 86,832,000 0 Pamlico Class Inland Construction Tenders WLIC 160 4 100 * 50 50 * 3,840 4,824 0 92,160,000 96,480,000 0 White Sumac Class Coastal Buoy Tenders WLM 157 9 100 * 500 500 * 2,952 2,400 128 159,408,000 302,400,000 34,560,000 Keeper Class Coastal Buoy Tenders WLM 551 2 100 * 500 500 * 2,952 4,800 128 35,424,000 134,400,000 7,680,000 65 ft. Harbor Tugs WYTL ( A, B, C & D ) 11 50 * 250 250 * 3,840 4,824 0 126,720,000 371,448,000 0

--------- ----------------------- ------------------------ ---------------------- 227 11,562,192,000 4,376,928,000 1,194,960,000

* - These flow rates are estimated based on the mission and the size ship in relation to ships whose flow rates are known. Seawater Cooling Total: 17,134,080,000

### Seawater Cooling Overboard Discharge 17 Table 3c. Estimated Annual Flows, Seawater Cooling Water, Army

Estimated Flow Rates (gpm) Estimated Times within 12 n.m. (hrs) Estimated Annual Flows (gal)

Qty Pierside Operating

within 12 n.m. In Transit Pierside Operating In Transit Pierside Operating within 12 n.m. In Transit

Army Logistics Support Vessel LSV 6 110 110 110 2,400 320 160 95,040,000 12,672,000 6,336,000 Landing Craft Utility LCU-2000 35 140 140 140 4,400 936 24 1,293,600,000 275,184,000 7,056,000 Large Tug LT-128 6 100 * 100 100 * 3,920 920 40 141,120,000 33,120,000 1,440,000

----- ----------------- ----------------- ------------------- 47 1,529,760,000 320,976,000 14,832,000

* - These flow rates are estimated based on the mission and the size ship in relation to ships whose flow rates are known. Seawater Cooling Total: 1,865,568,000

### Seawater Cooling Overboard Discharge 18 Table 4. Summary of Detected Analytes

Constituent Log Normal

Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Log Normal

Mean Frequency

of Detection Minimum

Concentration Maximum

Concentration Effluent - Influent

Log Normal Mean Mass Loading

Seawater Cooling Dedicated Influent Seawater Cooling Dedicated Effluent Metals (μ g/L) (μ g/L) (μ g/L) (μ g/L) (μ g/L) (μ g/L) (μ g/L) (lbs/yr) Aluminum Dissolved 59.7 2 of 5 BDL 207.0 59.84 3 of 5 BDL 175 0.12 390 Total 147.4 4 of 5 BDL 296.0 151.1 4 of 5 BDL 399.0 3.69 11,993 Arsenic Dissolved 1.97 2 of 5 BDL 12.60 2.26 1 of 5 BDL 18.50 0.29 943 Total 1.48 1 of 5 BDL 11.30 4.24 3 of 5 BDL 56.60 2.76 8,970 Barium Dissolved 15.37 5 of 5 5.80 23.90 18.02 5 of 5 10.10 21.85 2.65 8,613 Total 21.69 5 of 5 15.80 26.60 21.59 5 of 5 15.25 26.50 -0.10 (a) Boron Dissolved 2090 5 of 5 1740 2340 2082 5 of 5 1705 2435 -8.17 (a) Total 2059 5 of 5 1710 2340 2027 5 of 5 1590 2360 -32.08 (a) Calcium Dissolved 196248 5 of 5 164000 223000 197497 5 of 5 163000 229000 1248.60 4,058,145 Total 195870 5 of 5 164000 220000 192465 5 of 5 155000 218500 -3405.42 (a) Chromium Dissolved 5.47 1 of 5 BDL 10.70
~ 0 of 5 BDL BDL
~ (b) Total
~ 0 of 5 BDL BDL 7.71 2 of 5 BDL 35.50 7.71 25,059 Copper Dissolved 9.86 3 of 5 BDL 18.80 40.55 5 of 5 11.90 1040.00 30.69 99,747 Total 14.88 4 of 5 BDL 27.30 49.37 5 of 5 7.55 1135.00 34.49 112,098 Iron Dissolved 11.82 1 of 5 BDL 173.0 12.69 2 of 5 BDL 214 0.87 2,828 Total 227.5 5 of 5 90.6 399.0 241.2 5 of 5 87.65 546.5 13.73 44,625 Lead Dissolved
~ 0 of 5 BDL BDL 4.12 1 of 5 BDL 3.40 4.12 13,391 Total 4.19 1 of 5 BDL 2.40
~ 0 of 5 BDL BDL
~ (b) Magnesium Dissolved 617279 5 of 5 485000 741000 620084 5 of 5 470500 758500 2804.72 9,115,777 Total 613048 5 of 5 483000 743000 613252 5 of 5 435500 739000 204.53 664,754 Manganese Dissolved 10.58 5 of 5 5.90 24.80 12.44 5 of 5 5.80 26.40 1.86 6,045 Total 18.03 5 of 5 12.20 31.40 19.99 5 of 5 13.35 28.55 1.96 6,370 Molybdenum Dissolved 4.31 3 of 5 BDL 7.20 5.89 5 of 5 3.25 11.10 1.58 5,135 Total 3.73 3 of 5 BDL 5.10 3.44 3 of 5 BDL 5.50 -0.29 (a)

### Seawater Cooling Overboard Discharge 19 Nickel Dissolved
~ 0 of 5 BDL BDL 15.4 2 of 5 BDL 96.4 15.39 50,020 Total
~ 0 of 5 BDL BDL 19.6 3 of 5 BDL 95.0 19.55 63,541 Silver Total
~ 0 of 5 BDL BDL 2.77 1 of 5 BDL 5.90 2.77 9,003 Sodium Dissolved 5065465 5 of 5 3650000 6300000 5248566 5 of 5 4250000 6505000 183101.78 595,109,334 Total 5195468 5 of 5 3810000 6390000 5062513 5 of 5 3730000 6300000 -132954.92 (a) Thallium Dissolved 6.25 1 of 5 BDL 15.30 6.2 1 of 5 BDL 25.0 -0.02 (a) Total 9.37 2 of 5 BDL 35.60 5.5 1 of 5 BDL 10.8 -3.89 (a) Tin Dissolved
~ 0 of 5 BDL BDL 4.02 2 of 5 BDL 5.50 4.02 13,066 Total 3.44 1 of 5 BDL 4.30 5.19 3 of 5 BDL 35.50 1.75 5,688 Titanium Total 4.60 3 of 5 BDL 9.00 5.42 3 of 5 BDL 15.80 0.82 2,665 Vanadium Dissolved 5.48 1 of 5 BDL 12.10 5.7 2 of 5 BDL 11.9 0.20 650 Zinc Dissolved 18.29 5 of 5 15.80 20.80 30.00 5 of 5 14.15 50.25 11.71 38,059 Total 21.27 5 of 5 13.40 54.80 35.75 5 of 5 11.75 78.40 14.48 47,062

Classicals (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (lbs/yr) Alkalinity 68.5 5 of 5 49.0 84.0 62.8 5 of 5 38.0 94.0 -5.67 (a) Ammonia as Nitrogen 0.10 3 of 5 BDL 0.22 0.12 4 of 5 BDL 0.24 0.02 65,010

Chemical Oxygen Demand 140.2 5 of 5 70.00 289.0 141.5 4 of 5 BDL 265.0 1.28 4,160,617

Chloride 9270 5 of 5 7600 11000 9641 5 of 5 7750 12900 370.61 1,204,661,245 HEM
~ 0 of 5 BDL BDL
~ 0 of 5 BDL BDL
~ (b) Nitrate/Nitrite 0.06 4 of 5 BDL 0.45 0.08 4 of 5 BDL 1.71 0.02 65,010 Sulfate 1222 5 of 5 972 1600 1236 5 of 5 930 1440 14.53 47,229,508 Total Dissolved Solids 17618 5 of 5 14800 20700 16966 5 of 5 14300 20500 -651.92 (a)

Total Kjeldahl Nitrogen 0.58 5 of 5 0.20 1.70 0.68 5 of 5 0.34 1.30 0.10 325,048

Total Organic Carbon 1.7 2 of 5 BDL 3.6 2.0 3 of 5 BDL 2.9 0.32 1,040,154

### Seawater Cooling Overboard Discharge 20 Total Phosphorous 0.08 4 of 5 BDL 0.31 0.07 4 of 5 BDL 0.20 -0.01 (a) Total Recoverable Oil & Grease 2.1 5 of 5 0.8 12.0 1.29 5 of 5 0.90 2.30 -0.85 (a)

Total Sulfide 4.0 5 of 5 2.0 7.0 5.4 5 of 5 2.0 35.0 1.35 4,388,151 Total Suspended Solids 23.7 5 of 5 20.0 32.0 20.3 5 of 5 10.0 72.0 -3.40 (a)

Volatile Residue 1117 4 of 5 BDL 20700 465 4 of 5 BDL 20600 -652.05 (a)

Organics (μ g/L) (μ g/L) (μ g/L) (μ g/L) (μ g/L) (μ g/L) (μ g/L) (lbs/yr) 4-Chloro-3- Methylphenol ~ 0 of 5 BDL BDL 6.93 1 of 5 BDL 46.00 6.93 22,524

BDL = Below Detection Limit ~ = Value could not be calculated because samples are BDL (a) = Mass loading was not determined for parameters for which the influent concentration exceeded the effluent. (b) = Mass loading was not determined for parameters for which the effluent has a frequency of zero detections. Log-normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., “non-detect” samples), estimated analyte concentrations equivalent to one-half of the detection levels were also used to calculate the log-normal mean. For example, if a “non-detect” sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the log-normal mean calculation.

### Seawater Cooling Overboard Discharge 21 Table 5. Estimated Annual Mass Loadings of Constituents

Constituent * Log-normal Mean

Influent ( μ g/L) Log-normal Mean

Effluent ( μ g/L) Log-normal Mean

Concentration ( μ g/L) Estimated Annual

Mass Loading (lbs/yr) Ammonia as Nitrogen 100 120 20 65,010 Nitrate/Nitrite 60 80 20 65,010 Total Kjeldahl Nitrogen 580 680 100 325,048

Total Nitrogen A 390,058 Copper Dissolved 9.86 40.6 30.7 99,700 Total 14.88 49.37 34.49 112,100 Nickel Dissolved
~ 15.4 15.4 50,100 Total
~ 19.6 19.6 63,700 Silver Total
~ 2.77 2.77 9,000 * Mass loadings are presented for constituents that exceed ambient WQC and for bioaccumulators only. See Table 4 for a complete listing of mass loadings. A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Seawater Cooling Overboard Discharge 22 Table 6. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituents Log-normal

Mean Effluent Minimum

Concentration Effluent Maximum

Concentration Effluent Federal

Chronic WQC Most Stringent State

Chronic WQC

Classicals ( μ g/L) Ammonia as Nitrogen 20 BDL 240 None 6 (HI) A

Nitrate/Nitrite 80 BDL 1710 None 8 (HI) A Total Kjeldahl Nitrogen 680 340 1300 None

-
Total Nitrogen B 760 None 200 (HI) A Metals ( μ g/L) Copper Dissolved 40.55 11.90 1040.00 2.4 2.4 (CT, MS) Total 49.37 7.55 1135.00 2.9 2.9 (FL, GA) Nickel Dissolved 15.4 BDL 96.4 8.2 8.2 (CA, CT) Total 19.6 BDL 95.0 8.3 7.9 (WA) Silver Total 2.77 BDL 5.90 0.92 1.2 (WA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA = California CT = Connecticut FL = Florida GA= Georgia HI = Hawaii MS = Mississippi WA = Washington

### Seawater Cooling Overboard Discharge 23 Table 7. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X X 3.4 Concentrations X 4.1 Mass Loadings X X 4.2 Environmental Concentrations X 4.3 Thermal Effects X4.4 Potential for Introducing NonIndigenous Species X

### Seawater Piping Biofouling Prevention 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)--either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Seawater Piping Biofouling Prevention

### Seawater Piping Biofouling Prevention 2 2.0 DISCHARGE DESCRIPTION
This section describes the seawater piping biofouling control discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3). This report does not cover discharge of seawater cooling water from systems which use copper piping as the only biofouling preventative--this discharge is covered in the separate “Seawater Cooling Overboard Discharge” Nature of Discharge report

.


### 2.1 Equipment Description and Operation
The detrimental effects of marine biofouling on vessel performance have long been recognized by the Navy. The effects from biofouling are fouled surfaces of shipboard piping, heat exchangers and other related equipment used to distribute seawater aboard vessels resulting in flow restrictions and loss of heat transfer efficiency. Seawater cooling systems on vessels are used to provide cooling water for propulsion plant and auxiliary system heat exchangers. Heat exchangers remove heat directly from the main propulsion machinery, the electrical generating plants, air conditioning plants, and directly or indirectly from all other equipment requiring cooling. Seawater cooling systems draw seawater either directly, via a hull connection (sea chest), or indirectly, via a seawater header or the firemain that is supplied directly from a hull connection. The seawater is pumped through heat exchangers where the seawater absorbs heat and is then discharged overboard.
Preventing biofouling in seawater cooling system heat exchanger tubes is essential for maintaining peak heat exchanger operation and optimum propulsion plant performance. Marine biofouling prevention is accomplished on certain vessels with on-board chlorinators that inject low concentrations of sodium hypochlorite, a chlorine solution, at or near seawater cooling system intakes. See Figure 1 for a schematic diagram of a typical shipboard chlorinator treatment system. Chlorinators convert some chloride in seawater into a sodium hypochlorite solution in an electrolytic cell. The hypochlorite solution from the cell is then piped to the seawater intake or to junction piping at or near the seawater intake, where it is metered into the seachest. This provides treatment of the seawater prior to passing through the cooling system piping and components. The chlorine solution inhibits the growth of biofouling organisms or prevents them from attaching to the interior surfaces of seawater cooling system piping and components. A sampling connection at the outlet of the heat exchangers allows chlorine concentration levels to be monitored, and the injection rate to be modified as necessary.
In addition to chlorination, Military Sealift Command (MSC) vessels use two other methods to control biofouling; chemical dosing using an ethyl alcohol based chemical seawater dispersant, and anodic biofouling control systems. 1



### Chemical dosing as a means of b iofouling control involves the periodic injection of a proportioned amount of an ethyl alcohol based chemical dispersant into the seawater cooling system at or near the point of seawater intake, usually a seachest, and is currently used on one MSC oiler. See Figure 2 for a schematic diagram of a typical shipboard chemical dosing

### Seawater Piping Biofouling Prevention 3 treatment system. The means of injection may include a gravity head tank and flowmeter, an eductor dosing system, or a pump and tank system directed to a seachest. The chemical is flushed through the system and then discharged with the seawater.
Anodic biofouling control systems are designed for continuous operation. See Figure 3 for a schematic diagram of a typical shipboard anodic biofouling control system. Several systems are currently in use. Each anodic system works on the same principle: an impressed current applied to copper anodes accelerates the dissolution of copper ions. The anodes are usually mounted in the sea chest of the vessel. Copper ions inhibit the propagation of marine life and prevent biofouling.

2.2 Releases to the Environment
The purpose of chlorinating seawater is to protect the cooling system against biofouling caused by the attachment of living organisms. A chlorination system generates “free chlorine” in the form of a solution of sodium hypochlorite. This free chlorine reacts with various materials in seawater, including living tissue, as described in Section 3.3. Seawater discharged from cooling systems that are protected from biofouling with chlorine systems can contain residual free chlorine as well various reaction products resulting from the reaction of the free chlorine with organic material, ammonia, and bromide ion (see Section 3.3). In seawater, free chlorine and resulting reaction products are collectively called “chlorine produced oxidants” or CPO.
It is expected that the cooling water discharged from the MSC vessel that chemically doses its seawater cooling systems will contain the ethyl alcohol based dispersant. For those MSC vessels with anodic treatment systems, constituents from the copper anodes used are expected in the discharge.

2.3 Vessels Producing the Discharge
Refer to Table 1 for Navy and MSC vessel discharges. All other Armed Force vessels do not use seawater piping biofouling control methods or equipment. 2,3,4



### 3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Seawater biofouling treatment systems continuously discharge both within and beyond 12 nautical miles (n.m.) of shore as long as seawater cooling systems are in operation.

### Seawater Piping Biofouling Prevention 4 3.2 Rate
Table 1 presents estimated flow rates by ship class for pierside and underway conditions. 3,4,5



### Seawater c ooling water flows vary with propulsion plant operating conditions and the system cooling requirements. There is a greater demand for cooling water when a vessel is underway because the propulsion plant is operating. However, the time spent underway while transiting within 12 n.m. is small compared to the time a vessel spends pierside and beyond 12 n.m. While pierside, the demand for seawater cooling is primarily from auxiliary equipment such as electrical generators, and air conditioning and refrigeration plants.
Anodic biofouling control systems are manually controlled systems normally pre-set for a current output of 0.2 amps, 6 

### which results in the generation of approximately 0.237 g copper/hr based on the following Faraday’s Law calculation:

{(0.2 amps) (63.54 g copper/mole) (1 coulomb/amp-sec) (3,600 sec/hr)} / {(2 equivalents/mole) (96,484 coulomb/equivalent)}
= 0.237 g copper/hr

3.3 Constituents
Seawater dosed with sodium hypochlorite contains free chlorine in the form of hypochlorous acid (HOCl) and hypochlorite ion (OCl - 

### ). Free chlorine undergoes four important types of reactions in natural waters: (1) oxidation of reduced materials and subsequent conversion to chloride ion; (2) reaction with ammonia and organic amines to form chloramines, collectively called combined chlorine; (3) reaction with bromide to form hypobromous acid (HOBr) and hypobromite (OBr -- 

### ), called “free bromine;” and (4) reaction with organics to form chloro-organics. Free bromine reacts in a manner similar to free chlorine, oxidizing reduced material or forming bromamines (combined bromine) or bromo-organics. Most common analytical methods for quantifying chlorine in water measure the sum of all free and combined chlorine and bromine in solution, but do not measure the chloro- and bromo-organics. The results of such measurements in seawater are reported as CPO. The Navy injects enough free chlorine to meet the chlorine demand, and ensure that there is sufficient excess CPO throughout the system to protect against biofouling.
Seawater treated with the chemical seawater dispersant contains primarily ethyl alcohol and ammonium chloride. Other constituents of this dispersant are unknown. 1



### For those MSC vessels with installed anodic biofouling control systems, components of copper ions are expected in the discharge.
Copper is the only priority pollutant in this discharge. There are no known bioaccumulators in this discharge.

### Seawater Piping Biofouling Prevention 5 3.4 Concentrations
On submarines, sodium hypochlorite solution containing hypo chlorous acid and hypochlorite ion is injected continuously into seawater piping systems to maintain a CPO concentration of 100 μg/L at a sampling point within the system (i.e. before the point of discharge from the submarine). The actual CPO concentration at the point of discharge from the submarine is not measured. However, based on monitoring during initial system setup and system design data, the CPO concentration in seawater cooling overboard discharge is lower than the 100 μg/L concentration at the sample point. The concentrations of CPO discharged from MSC vessels are assumed to be similar to the concentrations discharged from submarines (i.e., 100 μ g/L) because there are no available chlorine discharge data for MSC vessels.
Every three days, over the course of one hour, twelve liters of the chemical dosing seawater dispersant is metered into a 9,200 gallons per minute (gpm) cooling water system aboard one MSC oiler. 1 

### Assuming all of the chemical added is also discharged, based on this ratio, a concentration of approximately 6 mg/L in the discharge would result. The ethyl alcohol based dispersant is expected to degrade rapidly and to be less than 6 mg/L after mixing with the receiving waters.
Copper ion emission concentrations resulting from the use of anodic biofouling control systems is dependent on the current (amperage) output and the seawater flow rate. The current output is manually set (0.2 amps typically) and is not adjusted when seawater pumps are put on or taken off line which changes the seawater flow rate. For a flow rate of 1,000 gal/min and current output of 0.2 amps, the resultant concentration will be 1.04 μ g/L based on the unit conversion calculation below:

Concentration = (mass copper) / (volume water) mass copper = 0.237 g/hr volume water = 1,000 gal/min (3.785 L/gal) (60 min/hr) = 2.27 x 10 5 

### L/hr concentration = (0.237 g/hr) / (2.27 x 10 5 

### L/hr) = 1.04 x 10 -6 

### g/L = 1.04 μ g/L

A flow rate of 1,000 gal/min, was used for this sample calculation only. 1,000 gal/min is a round number and close to the flow rate of many fire pumps. Similar calculations can be performed for other flow rates, with the resultant concentrations presented in Table 1.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality standards. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

### Seawater Piping Biofouling Prevention 6 4.1 Mass Loadings
Mass loadings were calculated in Table 2 based on ship movement data and the flow rates of seawater estimated from Table 1. 7 

### Calculations in Table 2 assumed that a chlorine concentration of 100 μ g/L is continuously present in the seawater discharge. Most common analytical methods for quantifying chlorine in water measure the sum of all free and combined chlorine and bromine in solution. The results of such measurements in seawater are reported as CPO. The Navy injects enough “free chlorine” to meet the chlorine demand, and ensure that there is sufficient excess CPO throughout the system to protect against biofouling. The total estimated mass loadings for chlorine as CPO in Table 2 were calculated to be 2,538 pounds per year. The following is a sample calculation for the SSN 688 at pierside:

Cl 2 

### Mass Loading =(0.1 mg/L)(1.41x1 0 8 

### gal/yr)(3.7854 L/gal)(2.2 lb/kg)(1 kg/1x10 6 

### mg)

=117 lb/yr

Cl 2 

### concentration =0.1 mg/L (Mean concentration) Flow rate =141,000,000 gal/yr Conversion gals to liters =3.7854 L/gal Conversion kg to lb =2.2 lb/kg Conversion mg to kg =1 kg/1x10 6 

### mg Cl 2 

### Mass Loading =117 lb/yr

The dispersant dosing treatment system injects 12 liters of dispersant 26 times per year. 1 

### At a weight of 8.23 pounds per gallon (lb/gal), a total of 678 pounds (82 gallons) of the dispersant are added to over 1.033 billion gallons of seawater cooling water while in port. It was assumed that with only 48 hours of transit time annually (with an average of 4 hours per transit), dispersant dosing evolutions would not take place during transit.

Dispersant Mass Loading = (26 inj/yr)(12 L)(8.23 lb/gal)(.2642 gal/liters)

= 678 lb/yr
Injections per year = (78 days in port)/(Inject every 3 days) = 26 inj/yr Amount Injected = 12 liters per injection Conversion gals to lb = 8.23 lb/gal Conversion liters to gal = .2642 gal/liters Dispersant Mass Loading = 678 lb/yr

For the 19 MSC vessels with anodic biofouling control systems, using the copper discharge rate of 0.237 g copper/hr and the estimated annual seawater discharge flow rates from these vessels (Table 1 and 2), yields a total copper mass loading of 25.0 pounds per year.

4.2 Environmental Concentrations
Table 3 compares the constituent concentrations from Section 3.4 with the Federal and most stringent state water quality criteria for CPO and copper. The estimated concentrations of

### Seawater Piping Biofouling Prevention 7 CPO exceed the most stringent state water quality criteria.
Based on monitoring and system design data, CPO levels are estimated to be less than 100 μ g/L for seawater discharges on submarines. There are no Federal water quality criteria for chlorine. The most stringent state water quality criteria is 7.5 μ g/L. The concentration value of 100 μ g/L is measured as CPO which is primarily chlorine but can also include a small amount of bromine.
A computer model was used that plotte d chlorine plumes (using existing and planned chlorine discharge levels) from various vessels in Mayport, Florida. Mayport is the smallest of the five major naval ports. Plume dimensions at critical concentrations (7.5, 10, and 13 μ g/L) were compared with mixing zone limitations enforced by the states of Virginia and Washington. Virginia and Washington are used because they are the only states with clearly defined mixing zones. Only the chlorine plume from the MSC vessels did not meet the mixing requirements of the selected states. This plume spread out during the later stages of mixing and exceeded certain mixing zone width requirements. 8 

### The computer model did not assume expected decay of CPO, which would result in smaller mixing zones.

4.3 Potential for Introducing Non-indigenous Species
Biofouling prevention systems do not present an opportunity for transport of nonindigenous species. The anti-biofouling systems are designed to prevent organisms from attaching to any part of seawater systems so they are discharged directly overboard in the same geographical area in which they are pulled into the system.

5.0 CONCLUSION
Seawater piping biofouling control discharge has the potential to cause an adverse environmental effect. For chlorinator biofouling prevention systems, chlorine is discharged in significant amounts at concentrations expected to exceed ambient state water quality criteria. The use of anodic biofouling control systems results in the discharge of copper overboard. The copper concentration being significantly lower than water quality criteria, and the annual mass loading being very low, the discharges from anodic biofouling control have a low potential for causing adverse environmental effects.

6.0 DATA SOURCES AND REFERENCES
Table 4 lists the data source of the information presented in each section of this NOD report.
Specific References

1. Weersing, P., MSC Central Technical Activity, Code N72PC1. Point Paper,

### Seawater Piping Biofouling Prevention 8 “Supplemental Information About Chlorinators and Other Anti-Fouling Systems for Seawater Systems On MSC Ships,” December 20, 1996.

2. Aivalotis, J., USCG, Personal communication with David Eaton, M. Rosenblatt & Son. April 25, 1997.

3. Kurz, Richard J., SEA 92T251. Equipment Expert Meeting Structured Questions, “Seawater System Chlorination with Dechlorination,” September 5, 1996.

4. UNDS Equipment Expert Meeting (October 2, 1996) Minutes. Chlorinator/Dechlorinator. October 11, 1996.

5. UNDS Round Two Equipment Expert Meeting Minutes, Seawater Piping Biofouli ng Control Discharge, April 4, 1997.

6. Cathelco Limited Information Packet, December 24, 1997.

7. Pentagon Ship Movement Data for Years 1991 - 1995, Dated March 4, 1997.

8. Malcolm Pirnie Inc., “Environmental Effects Analysis: Chlorination of Seawater Cooling Systems for Biofouling Prevention,” September 1997.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau

### Seawater Piping Biofouling Prevention 9 of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Seawater Piping Biofouling Prevention 10 Figure 1. Chlorination Systems Schematic

### Seawater Piping Biofouling Prevention 11 Figure 2. Typical Installation of Chemical Dosing System

### Seawater Piping Biofouling Prevention 12 Figure 3. Typical Installation of Anodic Biofouling Control System

### Seawater Piping Biofouling Prevention 13 Table 1 - Estimated Annual Seawater Cooling Water Discharge Volumes for Vessels With Seawater Piping Biofouling Control Systems

Ship Class Biofouling

Control System No. of

Ships No. of Transits per Year (1) No. of

Days In Port (1) No. of Hours

In Transit (<12 n.m.) (2) Estimated

Flow by Ship Class Pierside (gal/min) Estimated Flow

by Ship Class Underway (gal/min) Concentrations

( μ g/L)
pierside (3) U/W Total Estimated

Discharge Pierside (gal/year) Total Estimated

Discharge In Transit (<12 n.m.) (gal/year) SSN 688 (Mod 25) Chlorinator 4 14 183 56 133 192,000 100 (6) 141,000,000 1,790,000

T-AH Chlorinator 2 8 184 32 2,000 40,500 100 (6) 1,070,000,000 156,000,000 T-AFS Chlorinator 3 14 148 56 2,000 40,500 100 (6) 1,280,000,000 408,000,000 T-AO Chemical

Dosing (4) 1 12 78 48 9,200 40,500 6,000 (7) 1,030,000,000 117,000,000

T-AGS Anodic (5) 5 12 96 48 1,500 6,840 0.69 0.15 (8) 1,040,000,000 98,500,000 T-AGOS 1 Class Anodic (5 6 8 70 32 1,500 6,840 0.69 0.15 (8) 907,000,000 78,800,000

T-AGOS 19 Class Anodic (5 4 10 107 40 1,500 6,840 0.69 0.15 (8) 924,000,000 65,700,000

T-AGM Anodic (5 1 8 133 32 2,000 40,500 0.52 0.026 (8) 383,000,000 77,800,000 T-ATF Anodic (5 3 34 166 136 1,650 7,500 0.63 0.14 (8) 1,180,000,000 184,000,000

(1) In accordance with information presented in Reference 7. (2) Assuming an average transit time of 4 hours per vessel. (3) Differing pierside and underway (U/W) concentrations apply to vessels with anodic biofouling control systems (4) It is assumed that the same volume of chemical dispersant injected is also discharged (representing worst case). (5) Anodic biofouling control system concentrations were calculated based on a copper generation rate of 0.237 g/hr (Section 3.4) (6) Concentration of Chlorine as CPO (7) Concentration assuming the dispersant is 100% ethanol (representing worst case) (8) Concentration of copper

### Seawater Piping Biofouling Prevention 14 Table 2 - Estimated Annual Mass Loading Calculations for Seawater Cooling Water Discharges from Vessels With

Seawater Piping Biofouling Control Systems Currently Installed Onboard

Ship Class Biofouling

Control System Total

Estimated Discharge Pierside (gal/year) Total

Estimated Discharge In Transit (<12 n.m.) (gal/year) Estimated

Flow by Ship Class Pierside (gal/min) Estimated

Flow by Ship Class Underway (gal/min) Concentrations

μ g/L

pierside (1) U/W Estimated

Mass Loading Pierside (lb/yr) Estimated

Mass Loading In Transit (lb/yr) Total Mass

Loading by Type of System Pierside (lb/yr) Total Mass

Loading by Type of System In Transit (lb/yr) SSN 688 (Mod 25) Chlorinator 141,000,000 1,790,000 133 133 100 (4) 117 1.5

T-AH Chlorinator 1,070,000,000 156,000,000 2,000 40,500 100 (4) 883 130 2,066 472 T-AFS Chlorinator 1,280,000,000 408,000,000 2,000 40,500 100 (4) 1,066 340 T-AO Chemical

Dosing (2) 1,030,000,000 117,000,000 9,200 40,500 6,000 (5) 678 Note (7) 678 Note (7)

T-AGS Anodic (3) 1,040,000,000 98,500,000 1,500 6,840 0.69 0.15 (6) 6.02 0.125 T-AGOS 1 Class Anodic (3) 907,000,000 78,800,000 1,500 6,840 0.69 0.15 (6) 5.25 0.100

T-AGOS 19 Class Anodic (3) 924,000,000 65,700,000 1,500 6,840 0.69 0.15 (6) 5.35 0.083 24.48 0.54

T-AGM Anodic (3) 383,000,000 77,800,000 2,000 40,500 0.52 0.026 (6) 1.66 0.017 T-ATF Anodic (3) 1,180,000,000 184,000,000 1,650 7,500 0.63 0.14 (6) 6.21 0.213

(1) Differing pierside and underway (U/W) concentrations apply to vessels with anodic biofouling control systems (2) It is assumed that the same volume of chemical dispersant injected is also discharged (representing worst case) (3) Anodic biofouling control system concentrations were calculated based on a copper generation rate of 0.237 g/hr (Section 3.4) (4) Concentration of Chlorine as CPO (5) Concentration assuming the dispersant is 100% ethanol (representing worst case) (6) Concentration of copper (7) It is assumed that with only 48 hours of transit time annually (with an average of 4 hours per transit), chemical dosing evolutions would not take place during this time.

### Seawater Piping Biofouling Prevention 15 Table 3. Environmental Concentrations and Water Quality Criteria ( μ g/L)

Constituent Concentration

( μ g/L) Federal Chronic

WQC ( μ g/L) Most Stringent State

Chronic WQC ( μ g/L) CPO 100

- 7.5 (CT, HI, MS, NJ, VA, WA) Copper 0.52 - 0.69 2.4 2.4 (CT, MS)
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

CT = Connecticut HI = Hawaii MS = Mississippi NJ = New Jersey VA = Virginia WA = Washington



### Table 4. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X X X 3.4 Concentrations X X 4.1 Mass Loadings X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X X

### Small Boat Engine Wet Exhaust 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipments or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Small Boat Engine Wet Exhaust

### Small Boat Engine Wet Exhaust 2 2.0 DISCHARGE DESCRIPTION
This section describes the small boat engine wet exhaust discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Small boat engines commonly use seawater to both cool and quiet their exhaust. Seawater passes through the heat exchanger, gear oil cooler, and aftercooler (if equipped), and is then injected into the exhaust. When injected, some of the gaseous and solid components of the exhaust transfer into the cooling water. The cooling water then discharges into the receiving water. Any cooling water that is not injected into the exhaust is directed overboard. 1 

### For purposes of this analysis, it was assumed that all cooling water cycled through the engine is injected into the air exhaust.
Small boats are powered by either inboard or outboard engines . Inboard engines usually develop greater power than outboards. In addition, inboard engines are generally diesel fueledwhile outboard engines typically use gasoline. Inboard and outboard engines can be either twoor four-stroke. The majority of small boat outboard engines are two-stroke gasoline engines. The moving parts of gasoline-powered, two-stroke outboard engines are lubricated with oil thatis pre-mixed with gasoline. Thus, the oil is continuously burned with the gasoline. In fourstroke engines, lubricating oil is circulated and not intentionally introduced into the combustion chamber. 2



### A diagram of a typical two-stroke diesel engine air system is included as Figure 1. A diagram of a typical inboard wet-exhaust system is included as Figure 2. Although engine design may vary based on boat class, general process flow will be similar for all water-cooled, small boat engines.

2.2 Releases to the Environment
This discharge consists of water injected as a cooling stream into the exhaust system of small boat engines. Exhaust constituents generated during the operation of the engines can be transferred to the engines’ water cooling streams and discharged as wet exhaust. Inboard engines usually discharge wet exhaust above the water line. Outboard engines generally discharge their wet exhaust underwater through the propeller hub.

2.3 Vessels Producing the Discharge
There are approximately 3,300 Navy, 1,560 U.S. Coast Guard (USCG), 209 Army, and 1,454 Marine Corps small boats currently using seawater for cooling engine exhaust. Of the total number of small boats in the military fleet, 3,822 have inboard engines and 2,701 have outboard

### Small Boat Engine Wet Exhaust 3 engines. 3 

### Air Force and Military Sealift Command (MSC) small boats have not been included in this analysis; however, their inclusion does not significantly affect this reports conclusion.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Based on their limited range, all small boats are expected to operate within 12 nautical miles (n.m.). 1



### 3.2 Rate
Approximately one-third of the small boat fleet is equipped with outboard engines. Based on engine specifications, outboard engines can discharge up to 20 gallons per minute (gpm). 4 

### This rate was used as the fleet-wide average for outboard-driven small boats.
Inboard diesel engines generally have a higher discharge rate than outboard engines, and can discharge up to 100 gpm. 5 

### This estimate assumes that all cooling water flows through the engine and is discharged into the exhaust. Many small Armed Forces boats have twin engines, yielding a total flow rate up to 200 gpm per vessel. However, to take into account vessels with single engine installations, and for vessels with engines discharging less than 100 gpm per engine, a flow rate of 150 gpm per vessel was used as the average fleet-wide flow rate for boats with inboard engines.
Table 1 summarizes the estimated annual small boat engine wet exhaust flow rate by service. Flow rates were calculated for each service based on a monthly average operating time of 25 hours, and each vessel discharging 150 gpm of wet exhaust for inboards and 20 gpm for outboards. 4,5,6 

### The total fleet-wide discharge is approximately 11 billion gallons per year.

3.3 Constituents
The main constituents from all engines are oxides of nitrogen (NO x 

### ), organic compounds (including hydrocarbons (HCs)), carbon monoxide (CO), and particulates. The HC constituents are primarily the result of incomplete combustion. Since diesel fuels have a different composition than regular gasoline, the distribution of constituents in the exhaust differ between the two engine types. In general, diesel engines produce higher particulate emissions and lower organic emissions than gasoline-powered engines. 7



### 3.3.1 Outboard Engines

### Small Boat Engine Wet Exhaust 4 As mentioned in Section 2.1, almost all outboard engines are two-stroke gasoline powered engines. Some limited studies have been done on the impact of engine exhaust on water quality. A 1995 study measured the rate of introduction of volatile organic compounds (VOCs) into water during the operation of gasoline powered two-stroke and four-stroke outboard engines. In this study, a 10-horsepower (hp) outboard engine of each type was operated in an enclosed tank, and the increase in VOCs such as benzene was measured. The results were given in terms of milligram (mg) of compound per 10 minutes (min) of operation (e.g. 2800 mg benzene/10 min). Therefore, the number was a bulk measurement of the rate of accumulation of the compound in the water. 8



### The study reported that the VOC compounds found in water for both two-stroke and fourstroke engines were almost exclusively aromatic hydrocarbons. In most cases, other types of HCs were not found. The amount of VOCs found in the water on a power basis (grams per horsepower-hour (g/hp-hr) was equivalent to approximately 10% of the total HCs emitted in the exhaust. The VOC compounds measured in the 1995 study and the rate of accumulation are shown in Table 2. 8 

### Of the compounds listed in Table 2, benzene, toluene, ethylbenzene, and naphthalene are priority pollutants. No bioaccumulators are suspected to be present in this discharge.

3.3.2 Inboard Engines

To supp ort the air quality management planning process, EPA has published emission factors for various industrial sources, including stationary diesel engines up to 600 hp. These emissions factors relate quantities of released materials to fuel input, as nanogram per joule (ng/J) fuel input, or power output, as in g/hp-hr. Although intended for stationary diesel engines, these emission factors may be used to approximate diesel engine emissions for small boats and craft for the following reasons:

• For diesel en gine families with 1994 emissions certification, more than 90 percent have HC emissions of 0.5 g/hp-hr or less. 9 

### According to the manufacturer’s specification sheet, the HC emissions rate for a typical diesel engine in use by the Armed Forces is 0.45 g/hp-hr. 5 

### This demonstrates that the emissions from the typical diesel engine used by the Armed Forces is similar to industry standard diesel engines.

• The EPA emission factor for total organic carbon (TOC) emitted by diesel engines is approximately 1.1 g/hp-hr. 7 

### Because HCs are a subset of TOC, these emissions rates appear to be appropriate for an order of magnitude estimate.
Table 3 lists the emission factors for constituents present in the air exhaust of diesel engines. 7 

### Through contact with the cooling water, many of these constituents have the potential to be introduced into the water. Of the compounds shown in Table 3, benzene, toluene, acrolein, naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene,

### Small Boat Engine Wet Exhaust 5 benzo(a)pyrene, indeno(1,2,3-cd)pyrene, dibenzo(a,h)anthracene, and benzo(g,h,i)perylene are priority pollutants. None of the constituents listed in Table 3 are bioaccumulators.

3.4 Concentrations

3.4.1 Outboard Engines
The 1995 study measured the VOC accumulation in water from the exhaust of 10-hp (7.3 kilowatt (kW)) two-stroke engines. Because the typical two-stroke outboard engine used by the Armed Forces is a 100 hp (74.6 kW) engine, the results from the 10-hp engine are not directly transferable. However, one pertinent observation was reported in the 1995 study which permits the results of the smaller engine to be “scaled” up for a larger engine. This observation was that the concentration of VOC in the water was related primarily to the level of HC emissions in the exhaust. The higher the level of HC emissions in the engine air exhaust, the higher the level of VOC found in the water. 8 

### This indicates that if the level of total HC emissions for a larger engine can be estimated, the VOC concentrations for the compounds given in the 1995 study can reasonably be estimated by comparing the total HC emission rates.
In 1996, EPA published a rule regulating the emissions of gasoline-powered marine engines. The rule gives an equation for HC output which describes the current emission rates of two-stroke engines for the power output range from 2 hp to 300 hp. This equation is given as:

In this expression, P is the power in kW, and HC is the hydrocarbon emissions rate in g/kW-hr. 10 

### The relationship between power and emissions is different for 4-stroke and 2-stroke engines. However, in the absence of a similar equation for 4-stroke engines, it was assumed that 4-stroke engine emissions follow the same trend in emissions output on a normalized basis (power basis) as two-stroke engines.
Using the typical two-stroke outboard engine size of 100 hp and the EPA equation, the normalized output for HC is 162.5 g/kW-hr. Therefore, the total emissions rate is approximately 12,122 g/hr. Using the 7.3 kW engine power and the 267 g/kW-hr HC emissions rate reported in the 1995 study for the two-stroke engine, the total HC emissions rate is 1,949 g/hr. The ratio of HC emissions for these two engine sizes can be calculated as shown below:

Estimate the hydrocarbon emissions ratio for a 100 hp (74.6 kW) engine Total emissions rate (7.3 kW engine): = (HC)(P) = (267 g/kW-hr) (7.3 kW) = 1,949 g/hr Projected emissions rate (74.6 kW engine): = (HC)(P) = (162.5 g/kW-hr)(74.6 kW) = 12,122 g/hr Emissions ratio = 12,122/1,949 = 6.2

If it is assumed that there is a direct relationship between the HC emissions rate and the VOC introduction rate, the rates of VOC introduction measured in the 1995 study can be multiplied by the HC emissions ratio. Using this approach, Table 4 provides the estimated VOC

HC = [151+(557/P 0.9 

### )], or 300 g/kW-hr, whichever is lower.

### Small Boat Engine Wet Exhaust 6 introduction rates for two-stroke outboard engine wet exhaust. An example calculation for benzene is provided below:

Benzene introduction rate for a 7.3 kW engine is 2800 mg/10 min (from 1995 study) Hydrocarbon emissions ratio for a 74.6 kW engine equals 6.2 (from above calculation) Benzene introduction rate equals (6.2)(2800 mg/10 min) = 17,360 mg/10 min

A similar procedure can be followed to estimate the VOC introduction rate for fourstroke engines. For these engines, a typical engine size is 90 hp. Again, using the EPA equation, the normalized output for HC in a 90 hp (67.1 kW) engine is 163.6 g/kW-hr. Therefore, the totalemissions rate is approximately 10,961 g/hr. Using the 7.3 kW engine power and the 267 g/kWhr HC emissions rate reported in the 1995 study for the two-stroke engine, the total HC emissions rate for the two-stroke engine in the 1995 study is 1,949 g/hr. For a 90 hp engine, the hydrocarbon emissions ratio therefore is 10,961/1,949 or 5.62. Using this ratio, Table 4 shows the estimated VOC introduction rate for four-stroke outboard engines. A sample calculation for the introduction rate of benzene is given below:

Benzene introduction rate for a 7.3 kW engine is 110 mg/10 min (from 1995 study) Hydrocarbon emissions ratio for a 67.1 kW engine equals 5.62 (from above calculation) Benzene introduction rate equals (5.62)(110 mg/10 min) = 618.2 mg/10 min

To estimate the concentration of the constituents in the wet exhaust, the flow rate must be used. From Section 3.2, the approximate wet exhaust flow rate for outboard engines is 20 gpm. The constituent concentration can be estimated by assuming all the VOCs introduced into the exhaust enters the water. Table 4 shows the estimated concentrations for the constituents in both two-stroke and four-stroke outboard engines. A sample calculation is presented below:

Wet Exhaust Flow rate: 20 gpm Benzene introduction rate: 17,360 mg/10 min Concentration = (17,360 mg/10 min)(1 min/20 gal)(1 gal/3.7854 L) = 22.9 mg/L

3.4.2 Inboard Engines
The constituent concentrations for the discharge of inboard engines were determined through a multi-step calculation. Using emission factors for mid-size stationary diesel engines given in Table 3 and diesel engine output specifications, the concentrations in air exhaust were estimated. The transfer of air exhaust constituents into the water was estimated using Henry’s Law, which relates the partial pressure of a gas in the atmosphere to the concentration of the gas in water. Table 5 provides the estimated constituent concentrations in the inboard engine wet exhaust. A sample calculation for the concentration of benzene is presented in the calculation sheet at the end of the report.

4.0 NATURE OF DISCHARGE ANALYSIS

### Small Boat Engine Wet Exhaust 7 Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality standards. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
The estimated mass loadings shown in Table 6 and Table 7 were based on the total number of small boats in the Navy, USCG, Army, and Marine Corps; on a monthly average operating time of 25 hours; and each boat discharging 150 gpm of wet exhaust for inboards and 20 gpm for outboards. 4,5,6 

### The concentration data for two-stroke engines were used because the majority of Armed Forces outboard engines are two-stroke. This approach is conservative because constituent concentrations in two-stroke engine wet exhaust are higher than concentrations in four-stroke engine exhaust.
Mass loading sample calculations:
Table 6, Outboard Engine for benzene is: (22.93 mg/L)(0.97 billion gallons/yr)(3.785 liters/gallon)(1 kg/10 6 

### mg) = 84,186 kg/yr

Table 7, Inboard Engine for benzo(a)pyrene is: (7.69 x 10 -5 

### mg/L)(10.31 billion gallons/yr)(3.785 liters/gallon)(1 kg/10 6 

### mg) = 3.0 kg/yr

4.2 Environmental Concentrations

T he concentrations and mass loading estimates described above are likely an overestimate because of non-equilibrium effects. The method used to estimate the concentrations of the diesel exhaust components in wet exhaust using Henry’s Law assumed sufficient residence time inside the engine for the aerosols in the exhaust to reach equilibrium with the cooling water. However, due to the short residence time of both air and water in the exhaust system, equilibrium conditions are unlikely. Residence time in the exhaust system is expected to be less than one second. Because equilibrium conditions are unlikely, less constituents will dissolve in the cooling water.
Based on cited research, chemical constituents in the wet exhaust from small boat engines can be present at concentrations that exceed water quality criteria (WQC). Table 8 summarizes estimated discharge concentrations and WQC for constituents of this discharge. Benzene, toluene, ethylbenzene, and naphthalene in two stroke outboard engines exceed the most stringent state WQC. Benzene and ethylbenzene in four-stroke outboard engine wet exhaust, and total PAHs in inboard engine wet exhaust each exceed the most stringent state WQC.

4.3 Non-Indigenous Species

### Small Boat Engine Wet Exhaust 8 The residence time of cooling water in small boat engines is very short; therefore, the wet exhaust is discharged within yards of where the cooling water was taken aboard. Because seawater is not transported during small boat operations, it is unlikely that the operation of small boat engines could transport or introduce non-indigenous species.

5.0 CONCLUSIONS
Constituents found in small boat engine wet exhaust discharge are estimated to be discharged in significant amounts that exceed water quality criteria. Therefore, this discharge has the potential to cause adverse environmental effects.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information, equipment specifications, average annual use, and fleet-wide inventories were considered in estimating the rate of discharge. Estimated constituent concentrations were calculated using solubility principles and published emissions data. Additional constituent concentrations were obtained from previously completed research. Table 9 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes - Small Boat Engine Wet Exhaust. 3 September 1996, M. Rosenblatt and Son, Inc. (MR&S)

2. Davis, Kip, NSWC. Small Boat Equipment Description and Operation, 10 March 1998, Doug Hamm, Malcolm Pirnie, Inc.

3. UNDS Round 2 Equipment Expert Meeting Minutes - Small Boat Wet Exhaust. 8 April 1997.

4. Outboard Marine Corporation. Water Pump Flow Data - V4/V6/V8. February 5, 1997.

5. Marine Specification Sheet, Model 7082-7000 Diesel Engine, Detroit Diesel Corporation, 1993.

6. Kip Davis (NSWC). Boat Numbers and Flow Rates, 18 March 1997, Doug Hamm (MPI).

7. United States Environmental Protection Agency, Office of Air Quali ty Planning and Standards. Compilation of Air Pollution Emission Factors. AP-42, Fifth Addition, January 1995.

### Small Boat Engine Wet Exhaust 9 8. Juttner, et. al, “Emissions of Two- and Four-stroke Outboard Engines- I. Quantification of Gases and VOC.” Water Resources, Vol. 29 (November 1995): 1976-1982.

9. Environmental Protection Agency. Final Regulatory Impact Analysis: Control of Emissions of Air Pollution from Highway Heavy Duty Engines, 16 September 1997.

10. Environmental Protection Agency, “Final Rule for New Gasoline Sp ark-Ignition Marine Engines”, Federal Register, Vol. 61, No. 194 (4 October 1996): 52091.

11. UNDS Database. 593.9117, Volume 2, Part 1. Small Boat Wet Exhaust. “Air Systems of a 2-stroke cycle engine (GM71).” 19 November 1996.

12. Oregon Iron Works. "Boat Information Book for 65' Explosive Ordnance Disposal Support Craft (EODSC) MK2, FY91-S9007-CL-BIB-010". 15 December 1993. Pg 3-12.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.

### Small Boat Engine Wet Exhaust 10 Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
LT Joyce Aivalotis, USCG. Average Operating Times for USCG Small Boats. 11 April 1997.
William Boudreaux (NSWC) & Kip Davis (NSWC). Ship Numbers and Flow Rates, 12 May 1997, Doug Hamm (MPI).
Staskiel, Mike, PMS324G16. List of Small Boats by Engine Type. 3 October 1996.
MARCORSYSCOM. Totals for Marine Small Boat/Watercraft. 14 February 1997.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. 23 March 1995.

### Small Boat Engine Wet Exhaust 11 Figure 1. Air Systems of a Two-Stroke Cycle Engine (GM71) 11

### Small Boat Engine Wet Exhaust 12 Figure 2. Typical Water Jacketed Elevated Loop 12

### Small Boat Engine Wet Exhaust 13 Table 1. Estimated Annual Small Boat Wet Exhaust Discharge Flow Rates 3,4,5,6



### Service (fleet) Number of Small Boats Estimated Annual Discharge*

(billions of gallons) Navy (inboard) 2,500 6.75 Navy (outboard) 800 0.29 USCG (inboard) 620 1.67 USCG (outboard) 940 0.34 Army (inboard) 152 0.41 Army (outboard) 57 0.02 Marine Corps (outboard) 904 0.32 Marine Corps (inboard) 550 1.48 Totals (inboard) Totals (outboard) Totals (combined) 3,822 2,701 6,523 10.31 0.97 11.28 * Based on 150 gpm for vessels with inboard engines, 20 gpm for vessels with outboard engines, and an average operating time of 25 hours/month.


### Table 2. Wet Exhaust Constituents Emitted from Two and Four-Stroke 10 Horsepower Gasoline Outboard Engines 8



### Constituent Amount in Wet Exhaust from

Two-Stroke Outboard Engines (mg/10 min)* Amount in Wet Exhaust from Four-Stroke Outboard Engines

(mg/10 min) Benzene 2800 110 Toluene 8500 260 Ethylbenzene 2000 22 p/m-Xylene 6900 71 o-Xylene 3600 37 3 4-Ethyltoluene 3400 26 Mesitylene 1200 10 2-Ethyltoluene 870 8.7 Pseudocumene 4500 40 Hemellitene 1200 13 Indane 840 4.7 Indene 270 6.5 Naphthalene 1400 13 2-Methylnaphthalene 930 5.5 1-Methylnaphthalene 350 2.7 Formaldehyde 970 100 *Note: Majority of small boat outboard engines in the Armed Forces are two-stroke engines

### Small Boat Engine Wet Exhaust 14 Table 3. Organic Compound Emission Factors for Diesel Engines 7



### Constituent Emission Factor

(lb/MMBtu)* (ng/J) Benzene 0.000933 0.40119 Toluene 0.000409 0.17587 Xylenes 0.000285 0.12255 Formaldehyde 0.00118 0.5074 Acetaldehyde 0.000767 0.32981 Acrolein 0.0000925 0.039775 No x 

### 4.41 1896.3 CO 0.95 408.5 CO 2 

### 164 70520 Naphthalene 0.0000848 0.036464 Acenaphthylene 0.00000506 0.0021758 Acenaphthene 0.00000142 0.0006106 Fluorene 0.0000292 0.012556 Phenanthrene 0.0000294 0.012642 Anthracene 0.00000187 0.0008041 Fluoranthene 0.00000761 0.0032723 Pyrene 0.00000478 0.0020554 Benzo(a)anthracene 0.00000168 0.0007224 Chrysene 0.000000353 0.00015179 Benzo(b)fluoranthene 9.91E-08 0.000042613 Benzo(k)fluoranthene 0.000000155 0.00006665 Benzo(a)pyrene 0.000000188 0.00008084 Indeno(1,2,3-cd) pyrene 0.000000375 0.00016125 Dibenz(a,h) anthracene 0.000000583 0.00025069 Benzo(g,h,i) perylene 0.000000489 0.00021027 * lb/MMBtu = pounds per million British thermal units

### Small Boat Engine Wet Exhaust 15Table 4. Estimated Concentrations of Wet Exhaust Constituents from Two- and FourStroke Gasoline Outboard Engines

Constituent Introduction Rate

Two-Stroke Engines (mg /10 min)* Introduction Rate

Four-Stroke Engines (mg /10 min)* Estimated Concentrations in

Engine Wet Exhaust (mg/L)

Two-Stroke Four-Stroke Benzene 17360 618.2 22.93 0.82 Toluene 52700 1461.2 69.62 1.93 Ethylbenzene 12400 123.64 16.38 0.16 p/m-Xylene 42780 399.02 56.51 0.53 o-Xylene 22320 207.94 29.48 0.27 3 4-Ethyltoluene 21080 146.12 27.85 0.19 Mesitylene 7440 56.2 9.83 0.07 2-Ethyltoluene 5394 48.89 7.13 0.06 Pseudocumene 27900 224.8 36.86 0.3 Hemellitene 7440 73.06 9.83 0.1 Indane 5208 26.41 6.88 0.035 Indene 1674 36.53 2.21 0.048 Naphthalene 8680 73.06 11.47 0.1 2-Methylnaphthalene 5766 30.91 7.62 0.04 1-Methylnaphthalene 2170 15.17 2.87 0.02 Formaldehyde 6014 562 7.94 0.74 *Note: The majority of small boat outboard engines in the Armed Forces are two-stroke engines.

### Small Boat Engine Wet Exhaust 16 Table 5. Estimated Concentrations of Wet Exhaust Constituents from

Diesel Inboard Engines

Constituent Concentration in Air Exhaust Concentration in Discharge (moles/ft 3 

### ) (mg/L) Benzene 3.21E-08 1.87E-04 Toluene 1.19E-08 6.78E-05 Xylenes 7.22E-09 4.91E-05 Formaldehyde 1.06E-07 7.58E-01 Acetaldehyde 4.68E-08 4.83E-02 Acrolein 4.44E-09 6.15E-04 Nox 3.95E-04 1.82E-02 CO 9.11E-05 1.97E-03 CO2 1.00E-02 1.11E+01 Naphthalene 1.78E-09 2.19E-04 Acenaphthylene 8.93E-11 2.16E-06 Acenaphthene 2.47E-11 6.58E-06 Fluorene 4.72E-10 3.81E-04 Phenanthrene 4.43E-10 8.17E-04 Anthracene 2.82E-11 3.46E-05 Fluoranthene 1.01E-10 3.84E-06 Pyrene 6.35E-11 4.43E-04 Benzo(a)anthracene 1.98E-11 9.18E-04 Chrysene 4.15E-12 2.13E-04 Benzo(b)fluoranthene 1.05E-12 5.28E-06 Benzo(k)fluoranthene 1.65E-12 2.49E-06 Benzo(a)pyrene 2.00E-12 7.69E-05 Indeno(1,2,3-cd) pyrene 3.65E-12 3.45E-03 Dibenzo(a,h) anthracene 5.63E-12 5.05E-03 Benzo(g,h,i) perylene 4.75E-12 5.80E-03

### Small Boat Engine Wet Exhaust 17 Table 6. Estimated Annual Fleet-Wide Mass Loading of Wet Exhaust Constituents from Outboard Engines

Constituent Concentrations Estimated Mass Loading (mg/L) (kg/yr) (lbs/yr) Benzene 22.93 84,196 185,600 Toluene 69.62 255,595 562,500 Ethylbenzene 16.38 60,140 132,600 p/m-Xylene 56.51 207,483 456,400 o-Xylene 29.48 108,252 238,700 Naphthalene 11.47 42,098 92,800 2-Methylnaphthalene 7.62 27,965 61,700 * These values were based on an annual flow rate of 0.97 billion gallons/year (see Section 4.1). Mass loadings are based on estimated emissions from a 100 HP, two-stroke engine.



### Table 7. Estimated Annual Fleet-Wide Mass Loading of Wet Exhaust Constituents from Diesel Inboard Engines

Constituent Concentration in Discharge Annual Mass Loading Annual Mass

Loading (mg/L) (Kilograms) (Pounds) Polyaromatic Hydrocarbons (PAHs) Naphthalene 2.19E-04 8.56E+00 18.9 Acenaphthylene 2.16E-06 8.44E-02 0.186 Acenaphthene 6.58E-06 2.57E-01 0.566 Fluorene 3.81E-04 1.49E+01 32.8 Phenanthrene 8.17E-04 3.19E+01 70.3 Anthracene 3.46E-05 1.35E+00 2.98 Fluoranthene 3.84E-06 1.50E-01 0.330 Pyrene 4.43E-04 1.73E+01 38.1 Benzo(a)anthracene 9.18E-04 3.58E+01 79.0 Chrysene 2.13E-04 8.32E+00 18.3 Benzo(b)fluoranthene 5.28E-06 2.06E-01 0.454 Benzo(k)fluoranthene 2.49E-06 9.72E-02 0.214 Benzo(a)pyrene 7.69E-05 3.00E+00 6.61 Indeno(1,2,3-cd) pyrene 3.45E-03 1.35E+02 297 Dibenzo(a,h) anthracene 5.05E-03 1.97E+02 434 Benzo(g,h,i) perylene 5.80E-03 2.26E+02 499 * These values were based on an annual flow rate of 10.31 billion gallons/year (see Section 4.1)

### Small Boat Engine Wet Exhaust 18 Table 8. Comparison of Estimated Concentrations of Wet Exhaust Constituents and Water Quality Criteria ( μ g/L)

Constituent Estimated Discharge Concentration Federal Acute WQC Most Stringent State Acute WQC Outboard Engines Two-Stroke Benzene 22,930 None 71.28 (FL) Toluene 69,620 None 2,100 (HI) Ethylbenzene 16,380 None 140 (HI) Naphthalene 11,470 None 780 (HI)

Four-Stroke Benzene 820 None 71.28 (FL) Ethylbenzene 160 None 140 (HI) Inboard Engines Acenaphthylene 2.16E-03 None 0.031 (FL) 1 Phenanthrene 8.17E-01 None 0.031 (FL) 1 Chrysene 2.13E-01 None 0.031 (FL) 1 Benzo(a)pyrene 7.69E-02 None 0.031 (FL) 1 Benzo(a)anthracene 9.18E-01

- 0.031 (FL) 1 Benzo(b)fluoranthene 5.28E-03

- 0.031 (FL) 1 Benzo(k)fluoranthene 2.49E-03

- 0.031 (FL) 1 Indeno(1,2,3-cd) pyrene 3.45

- 0.031 (FL) 1 Dibenzo(a,h) anthracene 5.05

- 0.031 (FL) 1 Benzo(g,h,i) perylene 5.80

- 0.031 (FL) 1 TOTAL PAHs (Inboard Engines) 16.3 1 0.031 (FL) 1

Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

FL = Florida HI = Hawaii
1: Florida criteria for total PAHs is for the total of the following individual PAH compounds: acenaphthylene, benzo-(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(g,h,i)perylene, benzo(k)fluoranthene, chrysene, dibenzo(a,h)anthracene, indeno(1,2,3-cd)pyrene, and phenanthrene. Estimated discharge concentrations for total PAHs represent a sum of these chemicals.

### Small Boat Engine Wet Exhaust 19 Table 9. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X X

2.2 Releases to the Environment X X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X X 3.2 Rate X X X 3.3 Constituents X X X 3.4 Concentrations X X 4.1 Mass Loadings X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X

### Small Boat Engine Wet Exhaust 20 Calculation Sheet Benzene

Background: Henry’s Law was used to estimate the concentration of components in wet exhaust from small boat inboard diesel engines. This calculation sheet shows the calculation for the concentration of benzene in the wet exhaust. Calculations for the other exhaust components were similar.

A heat balance was used to determine the approximate wet exhaust equilibrium temperature. The temperature was determined using an air exhaust flow rate of 2,190 cfm at 870 ° F, and a water injection rate of 100 gpm at 60 ° F. 60 ° F is believed to be an appropriate average because most large military ports are located in areas with similar average water temperatures. For this calculation, we assume the exhaust gas to have thermal properties similar to air.

Δ H: Change in enthalpy, m: mass of air or water, Cp: Specific heat capacity of air or water

Δ H exhaust gas = Δ H water Δ H exhaust gas = mCp (200 ° F - T)

= (2,190 ft 3 /min) (0.0601 lb m /ft 3 ) (0.24 Btu/lb m ° F) (870 ° F - T)
= 31.59 Btu/ ° F min. (870 ° F - T) (1)

Δ H water = mCp (T - 60 ° F) = (100 gal/min) (8.345 lb m /gal) (1 Btu/ lb m ° F) (T - 60 ° F)

= 834.5 Btu/ ° F min (T - 60 ° F) (2)

Setting (1) = (2) we obtain the following:

3 1.59 Btu/ ° F (870 ° F - T) = 834.5 Btu/ ° F( T - 60 ° F) 31.59 (T) + 834.5 (T) = 870 ° F (31.59) + 834.5 (60 ° F)

T = 89.5 ° F = (9/5) ° C + 32 = 32 ° C
This temperature was then used to determine the appropriate values for Henry’s Law constants, which vary with temperature.

At dilute concentrations, the concentration of benzene dissolved in water can be found from Henry’s Law: X exhaust = (H a ) (X water ) / (P t ) Where: X exhaust : Mole Fraction of Benzene in Exhaust H a : Henry’s Law Constant (Adjusted Reference 7) X water : Mole Fraction of Benzene in Water P t : Total Exhaust Pressure (atm)
Rearranging, Henry’s Law can be rewritten as:

X water = (X exhaust ) (P t ) / H a The mole fraction of benzene in exhaust can then be converted into a concentration of benzene in the wet exhaust in mg/L using the molecular weight of benzene.
Given Conditions and Assumptions:

### Small Boat Engine Wet Exhaust 21 55.56 moles H 2 O in 1 liter, [ (1000 g/liter) (mole H 2 O / 18 g ) = 55.56 moles H 2 O / liter ] Exhaust temperature of 870 ° F 2,190 cfm air exhau st flow rate for 228 kW diesel engine 0.401 ng/J generation rate of benzene Backpressure (P t ) on engine is approximately 1.147 atm Molecular weight of benzene is 78.11 grams per mole (78,110 mg/mole) Based on a water temperature of 32 ° C (305.15 K), Henry’s Law constants (in atm) for the constituents are the following: Constituent H a (atm)

Benzene 6.52E+02 Toluene 7.94E+02 Xylenes 7.64E+02 Formaldehyde 2.05E-01 Acetaldehyde 2.09E+00 Acrolein 1.98E+01 No x 6.81E+04 CO 1.37E+05 CO 2 3.85E+03 Naphthalene 5.09E+01 Acenaphthylene 3.08E+02 Acenaphthene 2.84E+01 Fluorene 1.01E+01 Phenanthrene 4.74E+00 Anthracene 7.11E+00 Fluoranthene 2.61E+02 Pyrene 1.42E+00 Benzo(a)anthracene 2.41E-01 Chrysene 2.18E-01 Benzo(b)fluoranthene 2.47E+00 Benzo(k)fluoranthene 8.19E+00 Benzo(a)pyrene 3.22E-01 Indeno(1,2,3-cd) pyrene 1.43E-02 Dibenzo(a,h) anthracene 1.52E-02 Benzo(g,h,i) perylene 1.11E-02
The conversion of Henry’s Law constants into common units is presented at the end of the calculation sheet.

Solution: 1) Total number of moles per cubic foot in the air exhaust, including constituents and circulated air, n t The number of moles per cubic foot can be determined using the ideal gas law; PV = n t RT

Where: P: Pressure within the exhaust piping, 1.147 atm V: Volume of space occupied by gas (assume 1 ft 3 ) R: Gas constant, 0.08206 L-atm/ K-mol T: Temperature, 305.15 K
Rearranging the ideal gas law equation and solving for n t /V:

n t /V = P/RT

n t /V = (1.147atm) / (( 0.08 206 L-atm/ K-mol) ( 1 ft 3 /28.32 L) (305.15 K)) = 1.30 moles/ ft 3

### Small Boat Engine Wet Exhaust 22 2) Concentration of benzene in air exhaust, A b

A b = (0.401 ng/J) (228 kW) (3.6 x 10 6 J/kW-hr) (10 -9 g/ng) (1000 mg/g) (min./2190 f t3 ) (hr/60 min)
= 2.50 x 10 -3 mg/ft 3
= (2.50 x 10 -3 mg/ft 3 ) (mole benzene/78,110 mg) = 3.2 x 10 -8 moles benzene/ft 3 exhaust

3) Mole fraction of gas in exhaust, P a

P a = A b / total molar concentration

P a = (3.2 x 10 -8 moles benzene/ ft 3 exhaust) / (1.30 total moles/ ft 3 exhaust)

P a = 2.46 x 10 -8 moles benzene/ mole exhaust

4) Mole fraction of gas in water, X water

X water = (X exhaust ) (P t ) / H a X water = (2.46 x 10 -8 ) (1.147 atm) / (652 atm)

X water = 4.33 x 10 -11 moles benzene/ mole water

5) Concentration of gas in water:

Per 1 liter of water;

Moles benzene = (4.33 x 10 -11 moles benzene/mole H 2 O)(55.56 moles H 2 O/ 1 liter) = 5.19 x 10 -9 moles/L = (2.4 x 10 -9 moles/L) (78,110 mg benzene/mole) = 1.87 x 10 -4 mg/L benzene

### Small Boat Engine Wet Exhaust 23 Determination of Henry’s Constants Henry’s constants for the constituents were available, but units and temperature for the constants varied between the references used. Henry’s constants with the following units were available:

1) H 1 , atm 2) H 2 , atm-m 3 /mol
For purposes of clarity, the same calculation was used for each constituent. It was therefore necessary to convert all of Henry’s constants to atm units, (1).

1) Conversion H 2 (atm-m 3 /mol) to H 1 (atm):

H 1 = (H 2 atm-m 3 /mol) (55.6 mol water / L) ( L / 10 -3 m 3 water) = (H 2 ) (55,600)

Henry’s constants with the following temperatures in degrees Celsius were available:

(1) 20 o C (2) 24 o C (3) 25 o C (4) 40 o C (5) 32 o C
Henry’s constants increase on average about threefold for every 10 o C rise in temperature for most volatile hydrocarbons. a Therefore, with an increase in temperature the constants increase by a factor of Δ H = 3 ( Δ T/10) . All of the constants were converted to 32 o C constants using the following conversions.
For Henry’s constant at 32 o C and converting from Henry’s constants at 20 o C , 24 o C, 25 o C, and 40 o C respectively:

H 32 = (H 20 ) (3.74),

H 32 = (H 24 ) (2.41),

H 32 = (H 25 ) (2.16), and

H 32 = (H 40 ) / (2.41)

Example - Henry’s Constant Calculation
For Acrolein, Henry’s constant was available in atm-m 3 /mol for 20 o c (H a = 9.54 x 10 -5 ) H a (atm) = (9.54 x 10 -5 atm-m 3 /mol) (55,600 mol/m 3 ) (3.74) H a = 19.8 atm
Using these methods, the constants were converted to atm units as shown in the table on the following page.

### Small Boat Engine Wet Exhaust 24 Table of Henry’s Constants

Degrees 32 degrees 20 degrees 25 degrees 25 degrees 40 degrees 32 degrees Source Cooper USEPA Mackay Mackay CH2M Hill Henry's Constants Units atm (atm*m 3 /mol) (atm*m 3 /mol) Kpa m 3 /mol (atm*m 3 /mol) atm Benzene 5.50E-01 6.52E+02 Toluene 6.70E-01 7.94E+02 Xylenes 6.45E-01 7.64E+02 Formaldehyde 9.87E-07 2.05E-01 Acetaldehyde 9.05E-05 2.09E+00 Acrolein 9.54E-05 1.98E+01 Nox 3.18E+04 3.18E+04 CO 6.35E+04 6.35E+04 CO2 1.95E+03 1.95E+03 Naphthalene 1.15E-03 4.24E-04 4.30E-02 5.09E+01 Acenaphthylene 1.48E-03 3.08E+02 Acenaphthene 9.20E-05 2.37E-04 2.40E-02 2.84E+01 Fluorene 6.42E-05 8.39E-05 8.50E-03 1.01E+01 Phenanthrene 1.59E-05 3.95E-05 4.00E-03 4.74E+00 Anthracene 1.02E-03 5.92E-05 6.00E-03 7.11E+00 Fluoranthene 6.46E-06 2.17E-03 2.20E-01 2.61E+02 Pyrene 5.04E-06 1.18E-05 1.20E-03 1.42E+00 Benz(a)anthracene 1.16E-06 2.41E-01 Chrysene 1.05E-06 2.18E-01 Benzo(b)fluoranthene 1.19E-05 2.47E+00 Benzo(k)fluoranthene 3.94E-05 8.19E+00 Benzo(a)pyrene 1.55E-06 3.22E-01 Indeno(1,2,3-cd) pyrene 6.86E-08 1.43E-02 Dibenz(a,h) anthracene 7.33E-08 1.52E-02 Benzo(g,h,i) perylene 5.34E-08 1.11E-02 Bold: Original Referenced Number Sources:

a. Kavanaugh, M. C. and R. Rhodes Trussell, “Design of Aeration Towers to Strip Volatile Contaminants from Drinking Water” Journal of the American Water Works Association , December, 1980.

b. Cooper, D. and F. Alley, Air Pollution Control, A Design Approach . Waveland Press, Inc., 1986.

c. United States Environmenta l Protection Agency, Office of Air Quality Planning and Standards. Ground-Water and Leachate Treatment Systems Manual . R-94, January 1995.

d. Mackay, D. and W. Y. Shiu, “A Critical Review of Henry’s Law Constants for Chemicals of Journal of Phys. Chem. Ref. Data . Vol. 10, No. 4, pp. 1175-1199. 1981.

e. CH 2 M Hill Inc., Bay Area Sewage Toxic Emissions Model. Version 3, 1992.

### Small Boat Engine Wet Exhaust MPCD Analysis 1 SMALL BOAT ENGINE WET EXHAUST MARINE POLLUTION CONTROL DEVICE (MPCD) ANALYSIS

Several alternatives were investigated to determine if any reasonable and practicable MPCDs exist or could be developed for controlling discharges from small boat engine wet exhaust. An MPCD is defined as any equipment or management practice, for installation or use onboard a vessel, designed to receive, retain, treat, control, or eliminate a discharge incidental to the normal operation of a vessel. Phase I of UNDS requires several factors to be considered when determining which discharges should be controlled by MPCDs. These include the practicability, operational impact, and cost of an MPCD. During Phase I of UNDS, an MPCD option was deemed reasonable and practicable even if the analysis showed it was reasonable and practicable only for a limited number of vessels or vessel classes, or only on new construction vessels. Therefore, every possible MPCD alternative was not evaluated. A more detailed evaluation of MPCD alternatives will be conducted during Phase II of UNDS when determining the performance requirements for MPCDs. This Phase II analysis will not be limited to the MPCDs described below and may consider additional MPCD options.
MPCD Options

Small boats of the armed forces are equipped with either two- or four-stroke compression ignition diesel or two-stroke spark ignition gasoline engines. During the operation of small boat engines, seawater is used to cool and quiet engine exhaust. As seawater is introduced into the engine exhaust, combustion by-products are captured by the seawater stream, and are discharged into the receiving water.
Three potential MPCD options were investigated. The purpose of these MPCDs would be to reduce or eliminate the release of hydrocarbons, oil and grease, volatile organic compounds, and semi-volatile organic compounds into the marine environment. The MPCD options were selected based on initial screenings of alternate materials and equipment, pollution prevention options, and management practices. They are listed below with brief descriptions of each:
Option 1: Employ dry exhaust systems on new boats and craft with inboard engines -This option would require that new small boats and craft to be equipped with inboard engines to be outfitted with dry exhaust systems wherever practicable.
Option 2: Convert small boats and craft with inboard engines to a dry exhaust system - This option would involve converting small boats and craft that are currently discharging wet exhaust at or below the waterline to dry exhaust systems.

### Small Boat Engine Wet Exhaust MPCD Analysis 2 Option 3: Procure new outboard engines with reduced emissions to meet new emissions requirements being imposed in 1999 - This option would involve replacing existing outboard engines with new “low emission” outboard engines either all at once or through attrition. These new outboards would meet EPA emission requirements which will be taking effect in 1999.
MPCD Analysis Results
Table 1 shows the results of the MPCD analysis. It contains information on the elements of practicability, effect on operational and warfighting capabilities, cost, environmental effectiveness, and a final determination for each option. Based on these findings, Option 1 -- building small boats and craft with inboard engines and dry exhaust systems, and Option 3 -- procure new outboard engines with reduced emissions to meet new emissions requirements, offer the best combination of these elements and are both considered to represent a reasonable and practicable MPCD.

### Small Boat Engine Wet Exhaust MPCD Analysis 3 Table 1. MPCD Option Analysis and Determination

MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

Option 1. Employ dry exhaust systems on new boats and craft with inboard engines This option would require a practicability study for new small boat and craft that have inboard engines. Higher acoustic and thermal signatures of dry exhaust systems are anticipated and could affect selected mission/operational profiles for some large special warfare boats. A boat and craft class study would be necessary to assess operational impact. Changing the existing design would impose additional design costs including engineering analysis, drawing development, and design history documentation. Costs associated with actual installation of the dry exhaust systems are limited to material costs because labor costs for installing each type of system are approximately the same. 1 

### Dry exhaust systems would eliminate the exhaust / seawater discharge on boats and crafts on which they are installed. Dry exhaust systems would disperse pollutants over a larger area reducing the potential for causing a sheen. This option appears to be practicable for most new boats and craft with inboard engines. This option would eliminate the wet exhaust discharge from new small boats and craft, on which it is practicable to install a dry exhaust system.

Option 2. Convert small boats and craft with inboard engines to a dry exhaust system Installing dry exhaust systems on existing small boats would require many modifications because of the large number of small boat configurations. Feasibility studies would be necessary for each boat class as it may not be physically possible to install a dry exhaust system on many boat classes. Higher acoustic and thermal signatures of dry exhaust systems is anticipated and could affect selected mission/operational profiles for some large special warfare boats. A boat and craft class study would be necessary to assess operational impact. Converting existing inboard engines would result in costs for: feasibility studies, engineering design, installation drawing development, alteration record preparation, Boat Information Book update, material, and installation. It is estimated that $36M would be required to study, design, and install this change on small boats/craft in the Navy. 1 

### The dry exhaust system would eliminate the exhaust/seawater discharge on vessels where the installation is practicable. Dry exhaust systems would disperse pollutants over a larger area reducing the potential for causing a sheen. This option does not appear to be practicable due to space and weight limitations on small vessels, and due to high cost on all boats and craft.

### Small Boat Engine Wet Exhaust MPCD Analysis 4 MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

Option 3. Procure new outboard engines with reduced emissions to meet new emissions requirements being imposed in 1999 Space and volume requirements are expected to be similar to those of existing engines. In some select cases, an increase in weight may occur and therefore slightly effect the boat’s trim angle. Some new engines are expected to weigh about 15% more than existing engines. Limited horsepower ranges currently available, may require two outboards where one was sufficient before. This MPCD is not expected to cause any significant change in war fighting capabilities or ship mobility. Assuming that the boat is supplied with similar horsepower and other characteristics as previous engines, the operational impact will be negligible. The costs associated with this option include: feasibility study, design, development, alteration record preparation, Boat Information Book update, maintenance record / preventative maintenance documentation update, material, and installation costs. Replacing all existing small boat and craft outboard engines in the Navy would cost an estimated $9.0M. Implementing this option through attrition would impose a considerably lower annual cost of $34,000. 1 

### New technology outboard engines will significantly reduce engine emissions. 2 

### New EPA regulations are likely to encourage thewidespread use of fourstroke, fuel injection, and advanced two-stroke engines. Engine manufacturers claim a 94% reduction in hydrocarbons with four-stroke engines. This MPCD appears to be practicable with the exception of converting all existing craft to reduced emission engines, as the cost of conversion often exceeds the value of the craft. The reduced emission engine, which burns fuel more completely and directly, will reduce the amount of pollution significantly.

### Small Boat Engine Wet Exhaust MPCD Analysis 5 REFERENCES

1 

### NSWC Comments on NOD Report Review, March 18, 1997.

2 

### USEPA, Amendment to Emissions Requirements Applicable to New Gasoline Spark-Ignition Marine Engines, EPA Title 40 CFR Part 91, Effective April 2, 1997.

### Sonar Dome Discharge 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Sonar Dome Discharge

### Sonar Dome Discharge 2 2.0 DISCHARGE DESCRIPTION
This section describes the sonar dome discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Sonar domes are located on the hulls of submarines and surface ships. Their purpose is to house electronic equipment used for detection, navigation, and ranging. Figures 1 through 4 show typical hull-mounted submarine and surface ship sonar domes.
Sonar domes on Navy surface ships are made of rubber. On submarines, they are made of steel or glass-reinforced plastic (GRP) with a 1/2-inch rubber boot covering the exterior. Military Sealift Command (MSC) T-AGS Class ships have sonar domes made of GRP. Zinc anodes are fastened to the exterior of steel sonar domes, and are contained within all the sonar domes, for cathodic protection. Figure 5 shows a Navy surface ship rubber dome, prior to installation.
Sonar domes can be filled with fresh and/or seawater to maintain their shape and design pressure. Most surface ship sonar domes are initially filled with freshwater, and any water that is lost underway is replenished with seawater from the firemain system. Sonar domes on FFG 7 Class frigates and some MSC ships are filled with seawater. Submarine sonar domes are connected to the sea through a small tube to equalize pressure, but water inside the dome has limited exchange with seawater. 1



### Table 1 summarizes sonar dome types, applications, and characteristics. The larger AN/SQS-53 and AN/SQS-26 sonar domes on cruisers and destroyers are located at the bow, and the smaller AN/SQS-56 domes on frigates are mounted on the keel. Submarine sonar domes are located at the bow. MSC T-AGS Class ships have several small sonar domes at various locations on the hull. The T-AGS Class sonar domes listed as free flood in Table 1, have ports which are open to the sea.

Table 2 sh ows materials that compose sonar domes, and components and materials inside sonar domes. Components and materials interior to sonar domes can include piping, sacrificial anodes, paint and the interior material surface of the sonar dome itself. Materials on the exterior surface of the sonar dome consist of the exterior material surface of the dome itself, any paints or coatings applied to the dome, and in some cases, sacrificial anodes.
There have been changes in the composition of the rubber material i n Navy surface ship sonar domes. Prior to 1985, all sonar domes contained tributyltin (TBT) antifoulant on the interior and exterior, to prevent or minimize marine growth. The TBT was impregnated into the outermost 1/4-inch layers (both exterior and interior) of the rubber. Figure 6 shows the plys or layers of a surface ship rubber sonar dome. Since 1985 rubber sonar domes have been manufactured with TBT only on the exterior surface. This type of sonar dome has been

### Sonar Dome Discharge 3 backfitted on older ships when they require sonar dome replacement, and has been installed on all new ships since 1990. Submarine sonar domes do not contain TBT. Instead, the exterior rubber boots are coated with a copper-based antifouling paint. 2 

### Table 3 lists the surface ships that have no TBT in the interior of their sonar domes.
Sonar domes are emptied for sonar dome maintenance or replacement, and are always emptied when a vessel is in drydock. Some maintenance can be performed pierside. Sonar domes are emptied by first pressurizing them with air, to force as much water as possible through the installed eductor piping. Once this step is complete, eductors are used to remove all remaining water in the dome. The total volume of water discharged exceeds the sonar dome volume because the seawater used to operate the eductors is discharged along with water from the sonar dome.
The water emptied from the sonar dome interior is: 1) discharged overboard, if the vessel is waterborne, or 2) collected for proper management ashore, if the vessel is in drydock.

2.2 Releases to the Environment
There are two sonar dome discharges, discharges of the water from the interior of sonar domes and external discharges. Discharges of water from the interior of the sonar dome result from maintenance evolutions that require the sonar dome to be emptied. External discharges result from continuous leaching of TBT or other anti-fouling compounds from the sonar dome exterior.

2.3 Vessels Producing the Discharge
Only Navy and MSC vessels are equip ped with sonar domes; the other Armed Forces ships are not. Sonar domes are equipped on the following types and classes of Navy and MSC ships:

• cruisers (CG and CGN Classes);

• destroyers (DD and DDG Classes);

• frigates (FFG Class);

• submarines (all SSN and SSBN Classes); and

• MSC T-AGS Class ships.
Tables 1 and 4 list the classes and populations of sonar dome-equipped vessels. Eightythree of the Navy surface ships have the larger AN/SQS-26 or SQS-53 sonar domes, and 43 have the smaller SQS-56 domes. Seventy-two active submarines have the smaller BQQ-5, BQR-7 or BSY-1 sonar domes, and the 17 others have much larger BQQ-6 sonar domes.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes the

### Sonar Dome Discharge 4discharge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Discharges from the interior of sonar domes only occur while vessels are pierside. Discharges from the external surface of sonar domes occur both within and beyond 12 nautical miles (n.m.) of shore, as materials leach continuously from the exterior of the dome. Discharges from the external surface of sonar domes were studied by the Naval Command, Control and Ocean Surveillance Center to characterize the environmental effects in San Diego harbor. 3



### 3.2 Disch arge Rate
Discharge from the interior of sonar domes is intermittent, depending on when the dome is emptied for maintenance. The average volume of water discharged for maintenance or repair activities is estimated based on input from naval shipyards. Sonar dome discharge volume varies with the dome type (size) and the method used to empty the dome. Norfolk and Pearl Harbor Naval Shipyards report that between 23,000 and 38,000 gallons is typically emptied from AN/SQS-53 sonar domes. 4,5 

### Table 4 contains the estimated annual discharge for sonar doneequipped vessels, based on the vessel class populations, sonar dome water capacity, and number of sonar domes expected to be emptied per year. On average, sonar domes on surface ships are emptied two times per year. Submarine sonar domes are normally emptied once per year. 2 

### Table 4 indicates a total annual discharge estimate of about 9.3 million gallons of interior sonar dome effluent, with just under 4.0 million of that being from sonar domes with internal TBT coatings.
Discharge from the external surface of a sonar dome is not a liquid discharge; rather, it is the leaching of anti-fouling agents into the surrounding water, and cannot be characterized by a volumetric flow rate. A Navy study was conducted in San Diego Bay in 1996 to determine TBT release rates from rubber sonar domes. Release rates from the external surfaces were determined by attaching a closed capture system to the sonar domes exteriors of three ships. The sampled sonar domes ranged in age, at 3, 10 and 20 years since installation. Table 5 shows that the average release rate for TBT from the external surfaces of the sonar domes was 0.36 μ g/cm 2 

### /day (micrograms per square centimeter per day), which results in an average release of 0.27 grams of TBT per day per ship. 3



### 3.3 Constituents
Table 2 shows the components and materials in sonar domes that can contribute constituents to the sonar dome discharge. The specific constituents depend on vessel class, the age of the dome, and the source of water that fills the dome. Discharges from the interior of sonar domes can include copper, nickel, tin and zinc which corrodes, erodes, or leaches from piping, sacrificial anodes, paint, or other material inside the dome. If the interior of the dome is impregnated with TBT, discharges will also include that constituent. The potable water and/or seawater that fills the sonar dome is also a source of constituents in discharges from the interior.

### Sonar Dome Discharge 5 In addition to these constituents, the interior effluent can contain compounds that are produced by degradation of the materials or reaction of material with the water. For instance, TBT, which might be found on both the interior and exterior of surface ship rubber sonar domes, degrades to dibutyltin (DBT) and monobutyltin (MBT).
External discharge constituents will include the TBT impregnated into the exterior of rubber sonar domes, or copper from copper based antifoulant coating on GRP and steel domes. Discharge from copper based and other antifoulant coatings are addressed separately, by the Hull Coating Leachate NOD Report.
Sampling of the water within the interior of sonar domes was conducted to identify and measure constituents, and was done according to procedures specified by the Navy. Samples from the interior of sonar domes were manually collected from the sonar dome piping systems of Navy surface ships and submarines, prior to discharge. The three sampling activities, Norfolk and Pearl Harbor Naval Shipyards and the Naval Command, Control and Ocean Surveillance Center did not all sample for the same constituents, as shown in Table 6. The tests that were performed on the samples included gas chromatography, hydride derivization and atomic absorption for TBT, and Toxicity Characteristic Leaching Procedure (TCLP) for metals. Tests done on sonar domes have indicated that the constituents of discharges from the interior of sonar domes are copper, nickel, tin, zinc, TBT (also known as tetra-normal-tributyltin), DBT and MBT. External sonar dome discharge constituents are TBT, DBT, MBT, copper, and zinc. 3,4,5,6



### Of the discharge constituents listed above, copper, nickel, and zinc are priority pollutants. None of the discharge constituents are bioaccumulators.

3.4 Concentrations
A summary of results of sampling discharges from the interior of sonar domes is contained in Table 6. Altogether, previous Navy studies have analyzed the water from the interior of sonar domes on 31 surface ships and submarines, with some vessels sampled multiple times. In addition to the metals and compounds listed in Section 3.3, four samples from the USS South Carolina were analyzed for Chemical Oxygen Demand (COD) and four samples from the USS Conolly were analyzed for both Total Suspended Solids (TSS) and Total Organic Carbon (TOC). The results of the sampling are summarized below: 3,4,5



### The average concentrations of the metal constituents are listed in Table 6.
Among the classical pollutants, COD levels ranged from 20 to 180 milligrams per liter (mg/L), with an average of 123 mg/L. Total organic carbon levels ranged between 4 and 6 mg/L. Total suspended solids were all below 4 mg/L.

TBT concentrations ranged from 1 to 470 micrograms per liter ( μ g /L), with an average of 74 μ g/L. Only one sample has been taken for concentrations of MBT and DBT. The results were 5 and 33 μ g/L, respectively.

### Sonar Dome Discharge 6 The firemain system is normally used to replenish sonar dome water lost on surface ships while underway and to educt the final water remaining when a sonar dome is emptied. However, the seawater from the firemain has a negligible effect on the constituent concentrations in this report. The salinity of the samples was low, indicating that little make-up seawater was added to the sonar domes during operations. The sonar dome sampling procedure requires samples to be taken from the dome, not from the emptied water, so firemain water that powers the eductors will not dilute or contribute constituents to the samples.
The above analytical results only address discharges from the interior of the sonar domes, and do not account for the discharge from the external surfaces. The external surface TBT release rates and estimated mass loadings are included in Sections 3.2 and 4.1, respectively.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality standards. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
The amount of water discharged fleet-wide from the interior of sonar domes was estimated using: 1) the amount of water generated from each type of sonar dome when that sonar dome is emptied; 2) the frequency of maintenance requiring sonar domes to be emptied; 3) the number of vessels w ith each type of sonar dome; and 4) the average concentrations of each of the constituents.
The estimated fleet-wide mass loadings for copper, nickel, tin, and zinc were calculated by the following formula:

For example, copper:

This calculation of mass loadings from sonar domes overestima tes the actual mass loadings because: Mass Loading (lbs/yr) = (avg. concentrations in μ g/L) (discharge in gal/yr) (3.7854 L/gal) (2.2 lb/kg) (10 -9 

### kg/ μ g)

Mass Loading = (303 μ g/L) (9,278,800 gal/yr) (3.7854 L/gal) (2.2 lb/kg)(10 -9 

### kg/ μ g) = 23.4 lbs/yr

### Sonar Dome Discharge 7 1) All discharges are assumed to occur pierside, but some of the discharges actually occur in drydock, where they are managed under shipyard discharge permits. 2) All discharges are assumed to occur within U.S. territorial waters, but some of the discharges actually occur outside U.S. territorial waters. 3) Results of discharge sample measurements which were below detection levels were assumed to be at the detection level.
The average constituent concentrations from T able 6, and a total estimated annual discharge volume of 9.3 million gallons per year for all vessels, taken from Table 4, were used to calculate the mass loadings. Based upon this information and the above formula, the annual mass loadings for metals were calculated to be 23 pounds for copper, 11 pounds for nickel, 15 pounds for tin, and 122 pounds for zinc.
The estimated fleet-wide mass loading for TBT, DBT and MBT generated from sonar dome interiors was calculated by the same formula (above), using a 3.96 million gallon discharge volume per year for those vessels in Table 4 that could have TBT inside the sonar dome. Using the average TBT concentration of 74 μ g/L, the annual mass loading estimate for TBT is 2.4 pounds per year due to discharges of water from the interior of the sonar dome. Although not representative of all vessels, the one sample in which DBT and MBT were measured is used to calculate fleet-wide mass loading for those constituents, using the same 3.96 million gallon discharge volume , since DBT and MBT are degradation products of TBT. Based on the single sample concentrations of 33 and 5 μ g/L for DBT and MBT, respectively, the estimated mass loadings are 1.1 and 0.2 pounds per year, respectively.
The calculation for TBT mass loading from the exteriors of surface ship rubber sonar domes was performed using the following formula:

Sonar Dome External Discharge TBT Mass Loading (lbs/yr) = (avg. release rate in g/day) (0.00205 lbs/g) (no. of ships with rubber domes) [avg. days/yr in port + ((no. transits/yr) (4 hrs/transit) ÷ 24 hrs/day)]

(0.27 g/day) (0.00205 lbs/g) (126 ships) (158 days/yr in port + ((12 transits/yr)(4 hrs/transit) ÷ 24 hrs/day)) = 12.6 lbs/yr

This formula uses the release rate from Table 5, which is based on sampling the discharge from the external surface of rubber sonar domes on three Navy surface ships, two of which had older sonar domes, and the newer DDG 51 Class USS John Paul Jones. 3 

### The formula also uses 158 days/yr as the estimated annual in-port time for each ship. The result is a TBT annual mass loading of 12.6 pounds due to discharges from the external surface of the sonar dome.
Therefore, the estimated maximum TBT mass loading within 12 n.m. for surface ships equipped with rubber sonar domes is 15.0 lbs/yr. This is the sum of 2.4 lbs/yr from discharges from the interior of the sonar domes and 12.6 lbs/yr from discharges from the external surface.
The estimated mass loadings generated from sonar dome interior and exterior discharges

### Sonar Dome Discharge 8 are presented in Table 7.

4.2 Environmental Concentrations
Table 8 compares the concentrations of constituents in sonar dome discharge with the most stringent water quality criteria (WQC) for that constituent. For sonar dome discharge, the constituents known to be present are TBT, DBT, MBT, copper, nickel, tin, and zinc. As a result of the comparison, the mean concentrations of TBT, copper, nickel, and zinc each exceed their respective Federal and most stringent state acute WQC. The interior concentrations can be compared to acute values and the exterior concentrations compared to chronic values. Neither DBT, MBT, nor tin has a relevant WQC.

4.3 Potential for Introduction of Non-Indigenous Species
Most sonar domes do not have the potential for the transfer of non-indigenous species in discharge of water from the interior of the sonar dome, or for transfer from the external surface. Non-indigenous species transfer would occur primarily during the emptying and replenishment of water in the interior of the sonar dome, and that is normally performed at a vessel's homeport or a shipyard. TBT on the interior surface of older rubber sonar domes and the exterior of all rubber sonar domes prevents attachment of marine organisms and could inhibit their growth.
Sonar domes filled with freshwater have little potential to be a mechanism for transfer of non-indigenous species in the water that fills the dome. There is minimal exchange with seawater. Only a small volume of water from the ship's potable water or surrounding seawater is added to the existing potable water in the dome between emptying and replenishment events to make up for any loss of sonar dome water during operations. Therefore, the opportunity to introduce non-native organisms into the surrounding water is limited.
Non-free-flood sonar domes filled with seawater have the potential for transfer of nonindigenous species. These types of sonar domes are found on FFG 7 Class Navy frigates. However, the non-indigenous species transfer potential is considered very low for the following reasons: 1) the maintenance requiring sonar dome emptying and replenishment is normally performed at the ship’s home port, so water taken on will be discharged in the same locality; 2) most of the sonar domes have TBT on the interior surface because the ships were built prior to 1990; and 3) the residence time inside these sonar domes is long (on the order of 6 months), making the probability of survival of non-indigenous species more remote. 1



### 5.0 CONCLUSIONS
Discharges fr om sonar domes has a low potential for causing adverse environmental effect. Although concentrations of organotins (MBT, DBT, and TBT), copper, nickel, and zinc discharged from sonar dome interiors exceed water quality criteria mass loadings of these substances are small (3.7, 23, 11, and 122 pounds per year, respectively). Exterior releases of TBT are also expected to be small (12.6 pounds annually).

### Sonar Dome Discharge 9 6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Table 9 lists data sources for this report.
Specific References

1. UNDS Equipment Expert Meeting Minutes. Sonar Dome. September 10, 1996.

2. UNDS MPCD Practicability Meeting

. Sonar Dome. June 26
, 1997

.
3. U.S. Navy. Marine Environmental Support Office, Naval Command, Control and Ocean Surveillance Center RDT&E Division (NRaD). Sonar Dome Discharge Evaluation . San Diego, California, February, 1997.

4. U.S. Navy. Pearl Harbor Naval Shipyard. Uniform National Discharge Standards Information. Pearl Harbor, Hawaii. Memorandum, September 1996.

5. Norfolk Naval Shipyard. Uniform National Discharge Standards Information. Portsmouth, Virginia. UNDS Questionnaire and Attachments, September 1996.

6. U.S. Navy. Naval Sea Systems Command (SEA 03VB). Tributyl Tin Contaminated Sonar Dome Water . Arlington, Virginia. Memorandum to SEA 91W4 and SEA 03M, 29 April 1994.

7. Sharpe, Richard. Jane’s Fighting Ships . Jane’s Information Group, Ltd., 1996-97

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water

### Sonar Dome Discharge 10 Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Sonar Dome Discharge 11 Figure 1. SQS-26 Sonar Dome in the Cruiser Belknap (CG 26)

### Sonar Dome Discharge 12 Figure 2. SQS-26 Sonar Dome on the Frigate Knox.

### Sonar Dome Discharge 13 Figure 3. SQS-53 Transducer Housing on a Spruance-Class Destroyer.

### Sonar Dome Discharge 14 Figure 4. Spherical, Bow-Mounted Array Housing for the BSY-2 Combat System.

### Sonar Dome Discharge 15 Figure 5. Surface Ship Rubber Sonar Dome Prior to Installation.

### Sonar Dome Discharge 16 Figure 6. Surface Ship Rubber Sonar Dome Layers.

### Sonar Dome Discharge 17 Table 1. Types and Characteristics of Sonar Domes 1,2,7

Sonar Type Ship Class No. of Vessels Dome

Material Dome Water Volume

(gal, approx.) Discharge Volume

per Event (est.) AN/SQS-53 CG 47, DDG 51, DD

963, DDG 993 80 Rubber/TBT 24,000 30,000

AN/SQS-26 CGN 36, 38 3 Rubber/TBT 24,000 30,000 AN/SQS-56 FFG 7 43 Rubber/TBT 5,000 * 6,000 AN/BQQ-5 SSN 688 (through

750), SSN 637, SSN 671 47 GRP or steel 35,000 35,000

AN/BQQ-6 SSBN 726 17 GRP or steel 74,000 74,000 AN/BQR-7 SSN 640 2 GRP or steel 35,000 35,000 AN/BSY-1 SSN 688 (from 751) 23 GRP or steel 35,000 35,000 EM100 MSC T-AGS 51 2 GRP N/A * N/A (free flood) EM1000 MSC T-AGS 60 (62 &

63) 2 GRP N/A * N/A (free flood)

EM121A MSC T-AGS 60 4 GRP 300 300** SEABEAM MSC T-AGS 26 2 GRP 511 300** TC-12NB MSC T-AGS 60 4 GRP 25 300** TR-109 MSC T-AGS 60 4 GRP 75 300** * Filled with seawater ** 300 gallons is representative of the two larger sonar dome types on MSC ships



### Table 2. Sonar Dome Materials 1,2

Component/Compound External to dome Internal to dome Surface Ships Submarines Surface Ships Submarines Tributyltin X X Copper-nickel piping X X Tin (other than TBT, DBT, MBT) X X Zinc anodes X X Glass-reinforced plastic X X X X Steel components X X X X Epoxy-based paints X X X Rubber X X X X Antifouling paint (Cu & other based) X X Note: Not all surface ships have TBT internal or external to the sonar dome(s).

### Sonar Dome Discharge 18 Table 3. Ships With TBT-Free Sonar Dome Interiors 1,2

Class Vessels in Class Number in Class CG 47 Class CG 51, CG 73 2 of 27 ships DD 963 Class DD 972, 979, 987 3 of 31 ships DDG 51 Class DDG 54, 56-67, 69, 71, 74 16 of 18 ships DDG 993 Class DDG 993 1 of 4 ships T-AGS 26, 51, 60 Classes All 8 of 8 ships SSNs & SSBNs All 89 of 89 vessels Based on equipment experts and sampling analysis results.



### Table 4. Annual Sonar Dome Interior Discharge by Ship Class 1,2,4,5,6

Ship Class Total

Ships Ships with

Internal TBT Gallons per

Drainage Event (est.) Drainage

Events per Year Gallons per Year

(ships with internal TBT*) Gallons per

Year (all vessels) CG 47 27 25 30,000 2 1,500,000 1,620,000 CGN 36 2 2 30,000 2 120,000 120,000 CGN 38 1 1 30,000 2 60,000 60,000 DDG 51 18 3 30,000 2 180,000 1,080,000 DD 963 31 28 30,000 2 1,680,000 1,860,000 DDG 993 4 3 30,000 2 180,000 240,000 FFG 7 43 20 6,000 2 240,000 516,000 T AGS 8 0 300 2 0 4,800 SSN 637 13 0 35,000 1 0 455,000 SSN 640 2 0 35,000 1 0 70,000 SSN 671 1 0 35,000 1 0 35,000 SSN 688 56 0 35,000 1 0 1,960,000 SSBN 726 17 0 74,000 1 0 1,258,000 TOTAL: 223 82 N/A N/A 3,960,000 9,278,800 * Could have TBT inside sonar dome, based on Table 6. N/A = not applicable



### Table 5. Tributyltin Release Rates from Exterior of Sonar Domes 3

Sampled Vessel Sample Date Tributyl tin (TBT) Release Rate μ g/cm 2 /day grams/day DDG 53 USS John Paul Jones 12-96 0.89 0.62 CG 59 USS Princeton 12-96 0.06 0.09 DD 976 USS Merrill 12-96 0.14 0.10 Average : 0.36 0.27

### Sonar Dome Discharge 19 Table 6. Constituent Concentrations in Sonar Dome Interior Discharge

(parts per billion, or μ g/L, except as noted) 3,4,5

Vessel Date of

Sample Tributyltin (TBT) Dibutyltin (DBT) Monobutyltin (MBT) Copper Nickel Tin Zinc Chemical Oxygen Demand Total

Suspended Solids Total

Organic Carbon CGN 40 USS Mississippi 2-7-94 85

- - - - - - - - - DDG 52 USS John Barry 3-28-94 470

- - - - - - - - - FF 1079 USS Bowen 4-1-94 82

- - - - - - - - - CGN 37 USS South Carolina 5-23-94

- - - - - - - 170***

- - CGN 37 USS South Carolina 5-23-94

- - - - - - - 120***

- - CGN 37 USS South Carolina 5-23-94

- - - - - - - 20***

- - CGN 37 USS South Carolina 5-23-94

- - - - - - - 180***

- - DD 968 USS Radford 6-30-94 58

- - - - - - - - - DD 968 USS Radford 6-30-94 35

- - - - - - - - - CG 48 USS Yorktown 7-7-94 58

- - - - - - - - - CG 74 USS Ticonderoga 7-25-94 48

- - - - - - - - - DD 988 USS Thorn 8-26-94 41

- - - - - - - - - DD 963 USS Spruance 12-1-94 14 33 5

- - - - - - - DD 984 USS Leftwich 10-94

- - - 920 660 <DL 110

- - - SSN 648 USS Aspro 11-94

- - - 220 <DL <DL 5390

- - - SSN 717 USS Olympia 11-94

- - - 220 <DL <DL 1040

- - - CG 73 USS Port Royal 1-95

- - - 1350 300 <DL 1520

- - - SSN 672 USS Pintado 2-95

- - - 190 <DL 250 1870

- - - SSN 697 USS Indianapolis 3-95

- - - 160 <DL 190 2370

- - - FFG 37 USS Crommelin 4-95

- - - <DL <DL 210 <DL

- - - DDG 53 USS John Paul Jones 4-95

- - - 660 140 <DL 2900

- - - FFG 37 USS Crommelin 5-95

- - - 190 160 <DL 1010

- - - SSN 724 USS Louisville 6-95

- - - <DL <DL 160 130

- - - SSN 677 USS Drum 7-95

- - - 130 <DL 260 5310

- - - SSN 715 USS Buffalo 8-95

- - - <DL <DL 240 <DL

- - -

### Sonar Dome Discharge 20 Table 6. (Continued)

Vessel Date of

Sample Tributyltin (TBT) Dibutyltin (DBT) Monobutyltin (MBT) Copper Nickel Tin Zinc Chemical Oxygen Demand Total

Suspended Solids Total

Organic Carbon CG 65 USS Chosin 9-95

- - - 1630 590 <DL 2130

- - - DDG 59 USS Russell 12-95

- - - <DL <DL <DL 180

- - - DD 979 USS Conolly 1-31-96

- - - - - - - - <4*** 5*** DD 979 USS Conolly 1-31-96

- - - - - - - - <4*** 6*** DD 979 USS Conolly 1-31-96

- - - - - - - - <4*** 5*** DD 979 USS Conolly 1-31-96

- - - - - - - - <4*** 4*** DDG 60 USS Hamilton 1-96

- - - 180 <DL <DL 8300

- - - SSN 675 USS Bluefish 1-96

- - - <DL 500 1100 260

- - - DDG 60 USS Hamilton 1-96

- - - 450 <DL <DL 880

- - - SSN 717 USS Olympia 3-96

- - - 100 <DL 290 570

- - - SSN 715 USS Buffalo 3-96

- - - <DL <DL 280 830

- - - FFG 57 USS Reuben James 5-96

- - - <DL <DL 100 300

- - - SSN 752 USS Pasadena 6-96

- - - <DL 130 280 <DL

- - - SSN 680 USS Wm H. Bates 6-96

- - - <DL 100 310 220

- - - DDG 56 USS John McCain 9-96

- - - 120 <DL <DL 630

- - - DDG 53 USS John Paul Jones 12-96 36.67

- - - - - 1500

- - - CG 59 USS Princeton 12-96 30.53

- - - - - 2600

- - - DD 976 USS Merrill 12-96 0.62

- - - - - 800

- - - DD 984 USS Leftwich 12-96 2.8

- - - - - - - - - MINIMUM* 1 N/A** N/A** 50 50 50 50 20*** <4*** 4*** MAXIMUM 470 N/A** N/A** 1,630 660 1100 8,300 180*** <4*** 6*** AVERAGE* 74 33** 5** 303 145 194 1577 123*** <4*** 5*** A hyphen (-) denotes the sample was not analyzed for that parameter DL = detection limit (50 μ g/L) N/A = not applicable

* Measurements below Detection Limit (DL) were set equal to the DL

** DBT and MBT based on only one sample

*** Units are mg/L

### Sonar Dome Discharge 21 Table 7. Estimated Sonar Dome Mass Loadings

Constituent Loading (lbs/yr) Discharge Origin External Internal Copper 23.4 X Nickel 11.2 X Tin 15.0 X Zinc 121.9 X TBT 2.4 X TBT 12.6 X DBT 1.1 X MBT 0.2 X

Table 8. Comparison of Measured Values in Sonar Dome Interior Discharge

with Water Quality Criteria ( μ g/L)

Constituent Mean / Max

Reported Concentration Federal

Acute WQC Federal

Chronic WQC Most Stringent

State Acute WQC Most Stringent

State Chronic WQC TBT 74 / 470 0.37 a 

### 0.01 a 

### 0.001 (VA) 0.001 (VA) Copper 303 / 1,630 2.4 2.4 2.4 (CT, MS) 2.4 (CT, MS) Nickel 145 / 660 74 8.2 8.3 (FL, GA) 7.9 (WA) Zinc 1,577 / 8,300 90 81 84.6 (WA) 76.6 (WA)
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

CT = Connecticut FL = Florida GA = Georgia MS = Mississippi VA = Virginia WA = Washington

a Proposed water quality criteria, August 7, 1997

### Sonar Dome Discharge 22 Table 9. Data Sources

Data Source NOD Report Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation Navy 3M MRC* X

2.2 Releases to the Environment Navy 3M MRC* X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate Design Documentation X X

3.3 Constituents Naval Shipyards X 3.4 Concentrations NRaD San Diego 4.1 Mass Loadings NRaD San Diego X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X

* MRC: Maintenance Requirement Card

### Steam Condensate 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the s ystem that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Steam Condensate

### Steam Condensate 2 

### 2.0 DISCHARGE DESCRIPTION
This section describes steam condensate discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Many surface ships in the Navy and Military Sealift Command (MSC) use steam from shore facilities when in port to operate auxiliary systems, such as laundry facilities, heating systems, and other hotel services. 1 

### Shore steam is piped above ground from land based boiler plants at pressures between 100 and 150 pounds per square inch (psi) to connections on the pier. The steam is routed via hoses from pier connections to topside connections on the ships. 1 

### Within the ship, the steam is routed through the ship’s auxiliary steam lines to the equipment. The heat exchangers and shipboard piping are usually fabricated of copper/nickel alloy and carbon steel, but can also contain titanium, copper, or nickel. Steam distribution systems on all naval ships use comparable designs and consistent standards for system materials; therefore, there is little variation in steam distribution and condensate collection system design between ships. In the process of supplying heat to the ship systems, the steam cools and most condenses into water. This condensed water is referred to as condensate.
The condensate passes through a series of traps and orifices and collects in insulated drain collection tanks in the lowest points of the machinery spaces. The tanks are usually made of carbon steel or galvanized carbon steel. When a ship is making its own steam, the condensate in these drains is recycled as boiler feedwater. When taking on shore steam, this condensate is discharged overboard because shore facilities do not have infrastructure to receive returned condensate from ships. The condensate normally is pumped to a topside riser connection for discharge overboard. The overboard discharge pump is controlled automatically, by means of a float switch or similar device in the collection tank. In limited cases, the condensate is combined with non-oily machinery wastewater in the non-oily machinery wastewater drain tank fordischarge overboard below the waterline. Discharge of steam condensate as a component of nonoily machinery wastewater is discussed in the non-oily machinery wastewater NOD report.
The naval facilities that provide shore steam to ships are designed and operated in accordance with Navy standards. 2 

### These facilities are required to sample and test shore steam and provide certification to ships that the steam meets the following requirements: 3



### • pH 8.0 to 9.5

• conductivity 25 μ mho/cm 2 

### max. (micromhos per square centimeter)

• dissolved silica 0.2 ppm max. (parts per million)

• hardness 0.10 epm max. (equivalents per million)

• total suspended solids 0.10 ppm max.

### Steam Condensate 3 

### 2.2 Releases to the Environment
Steam condensate discharge can contain metals or treatment chemicals entrained in or eroded from the shore facilities and ships’ steam systems. Steam condensate is discharged at elevated temperatures relative to the receiving waters. The discharge can be periodic or continuous based on the condensate flow rate, size of the condensate collection tank, and design of the collection tank’s pumping control system. The discharge occurs 5 to 10 feet above the waterline. A portion of the condensate flashes into steam when discharged at ambient air pressure.

2.3 Vessels Producing the D ischarge
Currently 179 Armed Forces surface ships discharge steam condensate. The classes and numbers of Navy and MSC ships that discharge shore-supplied steam condensate overboard are listed in Table 1. Submarines do not take on shore steam and do not discharge steam condensate because the design of their steam systems do not provide shore steam connections. The U.S. Coast Guard (USCG) does not discharge steam condensate because USCG vessels run their auxiliary boilers on a continuous basis. Also, most USCG homeports do not have readily available shore steam. 1 

### Army, Air Force, and Marine Corps vessels do not discharge steam condensate in port.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that charac terizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Steam condensate is discharged only in port when shore steam is supplied to ships. There are 179 ships that produce steam condensate discharge located in 10 ports along the coastal U.S. The larger ships producing this discharge are located in the ports of Norfolk, VA, Mayport, FL, San Diego, CA, Pearl Harbor, HI, and Everett and Bremerton, WA. In some ports, the ships are at several locations within the port instead of being centered at one set of piers.

3.2 Rate
The discharge rate of steam condensate is directly related to the amount of shore steam provided per hour to a ship. Table 2 provides the total estimated heating load for each ship class. These loads were obtained from a handbook on dockside utilities and reflect the sum of the constant (year round, such as, galley, laundry, hot water) and intermittent (seasonal) heating loads for the ship. 2 

### This handbook contains estimated steam load requirements for various ship classes at 10, 30, 50 and 70 degrees Fahrenheit ( ° F). For estimating purposes, the condensate

### Steam Condensate 4 

### discharge volumes were based on an average outside air temperature of 50 ° F (Table 2). A survey of meteorological data indicates that the 50 ° F data is estimated to represent the average outside air temperature of most naval ports. Column (b) in Table 2 shows the equivalent number of gallons per year of condensate discharged at 180 ° F that was obtained by applying the appropriate conversion factors to the figures in Column (a) and multiplying it by the number of days in port as listed in Table 1 (taken from the Ship Movement Data 4 

### ) as shown below.

Condensate Drain, gal/yr = (Loads, lbs/hr)(0.12 gal/lb)(24 hr/day)(No. of days in port per year)

Column (c) is obtained by multiply ing the figures in Column (b) by the number of ships in the class. Condensate flow rates for ships where steam requirement data was unavailable were interpolated based on the ship’s size and similarities to other ship classes. Based upon the calculations presented in Table 2 for an average air temperature of 50 ° F, the average steam condensate flow rate for all ship classes is 4,500 gallons per day per ship. As mentioned in Section 2.2, a small portion of the condensate will flash to steam as it is discharged; however, no data are available to determine the exact amount of the discharge that is steam. Therefore, to provide an upper bound on the flow that will enter the water, it is assumed that all of the discharge will be water.

3.3 Constituents

Ste am condensate is primarily water that contains materials from the shore steam piping, ship piping, and heat exchangers and boiler water chemicals. This discharge was sampled for constituents that had a potential for being in the discharge. Based on the steam condensate process, system designs, and analytical data available, analytes in the metals, organics, and classicals classes were tested. 1,5 

### Sampling was conducted on the LHD 1, CG 68, LSD 51, and TAO 198 in accordance with the Rationale for Discharge Sampling Report. 5 

### The results of the sampling are provided in reference 6. Table 3 provides a list of all constituents and their concentrations that were detected in the discharge. Discharges of steam condensate are expected to be warmer than ambient water temperatures with a maximum overboard discharge temperature of 180 ° F because this is the maximum operational temperature that condensate discharge pumps can withstand.
Antimony, arsenic, cadmium, copper, lead, nickel, selenium, thallium, zinc, ben zidine and bis(2-ethylexyl) phthalate are priority pollutants that were detected in this discharge. There were no bioaccumulators detected in this discharge.

3.4 Concentrations
The concentrations of detected constituents are presented in Table 3. Thi s table shows the constituents, the log-normal mean, the frequency of detection for each constituent, the maximum and minimum concentrations, and the mass loadings for each constituent. For the purposes of calculating the log-normal mean, a value of one-half the detection limit was used for nondetected results.

### Steam Condensate 5 

### 4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria.Section 4.3 discusses thermal effects. In Section 4.4, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings
Based on the discharge volume estimates developed in Table 2, mass loadings are presented in Table 3. Table 4 is present in order to highlight constituents with log-normal mean concentrations that exceed water quality criteria. A sample calculation of the estimated annual mass loading for copper is shown here:

Mass Loading for Copper (Dissolved)

Mass Loading = (Net Positive Log-normal Mean Concentration)(Flow Rate) (13.44 μ g/L)(3.785 L/gal)(296,000,000 gal/yr)(g/1,000,000 μ g)(lb/453.593 g) ≅ 33 lbs/yr

4.2 Environmental Concentrations
The constituent concentrations in the steam condensate discharge and their corresponding Federal and the most stringent state water quality criteria (WQC) are listed in Table 5. The copper and nickel concentrations exceed the Federal and the most stringent state WQC. Ammonia, nitrogen (as nitrate/nitrite and total kjeldahl nitrogen), and phosphorous exceeds the Hawaii WQC. Benzidine and bis(2-ethylhexyl) phthalate exceed the Georgia WQC.

4.3 Thermal Effects
The potential for steam condensate to cause thermal environmental effects was evaluated by modeling the thermal plume generated by the discharge and then comparing the model results to state thermal discharge water quality criteria. Thermal plumes from steam condensate discharge were modeled primarily using the Cornell Mixing Zone Expert System (CORMIX) model. Additional modeling of discharge plume characteristics was conducted using CH3D, a three-dimensional hydrodynamic and transport model. The models were used to estimate the plume size and temperature gradients in receiving water bodies. 7, 8 

### Modeling was performed for discharges from an aircraft carrier (CVN – 68 Class) and an underway replenishment vessel (AOE-1 Class).
The discharge plumes were modeled for the Navy ports in Norfolk, VA and Bremerton, WA. Virginia and Washington State are the only states that have established thermal mixing zone criteria in the form of allowable plume dimensions and ambient temperature increases in the receiving water body. Other coastal states require thermal mixing zones be established on a case-

### Steam Condensate 6

### by-case basis during the discharge permitting process, taking into account site- and dischargespecific information. Typically, criteria are developed to restrict the increase in the ambient water temperature and the extent of the plume in the water body to limit the duration of exposure for organisms passing through the plume, to prevent mortalities of bottom-dwelling organisms, and to prevent long-term effects such as migratory or community changes. State criteria for Virginia and Washington are summarized in Table 6.
The Virginia thermal regulations state that the dischar ge shall not cause the receiving ambient water temperature to increase by more than 3 °C at the edge of an allowable mixing zone. Virginia’s allowable mixing zone for a thermal plume permits the plume to extend over no more than one-half the width of the receiving watercourse. In addition, the plume shall not extend downstream a distance greater than five times the width of the receiving watercourse at the point of discharge. 7



### The Washington thermal criteria vary depending upon the waterbody classification established by the State. The water in the vicinity of the Navy port at Bremerton has been classified by Washington as a Class A waterbody. The State thermal criteria for a Class A waterbody requires that discharges shall not result in the receiving water temperature exceeding 16 °C at the edge of an allowable mixing zone. If the water temperature exceeds 16 °C due to natural conditions, no discharge shall raise the receiving water temperature by greater than 0.3 °C at the edge of an allowable mixing zone. If the water temperature does not exceed 16 °C due to natural conditions, the Washington criteria provide a formula to determine the allowable incremental temperature increase at the mixing zone boundary. Washington has established the mixing zone to permit the plume to extend over a horizontal distance no greater than 200 feet plus the depth of the water over the discharge point, and no greater than 25% of the width of the water body. 7



### The aircraft carrier and amphibious vessel were modeled for Norfolk in winter conditions because these situations result in the greatest steam condensate discharge. Modeling for Bremerton was performed for all months of the year because, while cold (i.e., winter) conditions result in the greatest flow rate, the warm (i.e., summer) conditions result in the lowest allowable temperature increase.
Based on the CORMIX modeling, steam condensate discharges do not exceed Virginia thermal mixing zone criteria. CORMIX model predictions do indicate that steam condensate discharge from an aircraft carrier into the inlet in Bremerton can exceed Washington’s thermal mixing zone criteria. The model predictions indicate that the discharge from AOE-1 Class vessels are not expected to exceed criteria. The AOE-1 Class is the next largest generator of steam condensate typically found in Bremerton.
There are several real-world considerations applicable to this discharge that CORMIX is not designed to simulate. These limitations result in over-conservative predictions. Such considerations include the effect of tidal action and turbulent mixing beyond the plunge zone (i.e. area of initial mixing from a discharge above the waterline) on the discharge plume. The additional mixing from tidal action and turbulence would be expected to reduce plume size. In

### Steam Condensate 7 

### addition, when applied to steam condensate discharge, CORMIX underestimates the initial mixing that occurs when the discharge enters the water. Since the version of CORMIX used for this exercise is designed for submerged release, the modeling effort was performed assuming the discharge hose touches the water surface. The fact that the discharge is known to occur 5-10 feet above the surface could not be simulated. The result is that the entry velocity assigned by CORMIX, based on flow rate and discharge pipe diameter, does not reflect accurately the true entry velocity, which is expected to be greater due to the acceleration from gravity. With higher entry velocities, the initial mixing would be greater and the plume size would be smaller. To illustrate, the CORMIX prediction for Bremerton Harbor estimates a plume depth of only 4 cm based on an initial discharge velocity of 1.67 meters per second (m/s). If the acceleration due to gravity from a 5-10 foot drop were considered, the entry velocity would increase significantly, to 5.7 m/s. The resulting plume depth would be considerably deeper and would result is more mixing with receiving water. Another occurrence that the CORMIX model can not simulate is the loss of heat to the atmosphere, especially during free-fall.
Because of the CORMIX model limitations for this discharge, the Navy and EPA modeled the steam condensate thermal plume from an aircraft carrier in Bremerton Harbor using the hydrodynamic and transport model CH3D. CH3D is expected to predict more accurately the plume dimensions than CORMIX because CH3D simulates the mixing of the buoyant plume with ambient flows by ways of advection and turbulent mixing both horizontally and vertically in the water column. CH3D is still expected to provide an overestimate of the plume size because this model does not account for the full extent of initial mixing in the plunge zone. CH3D estimates that the thermal plume for an aircraft carrier moored at the pier at Bremerton would extend a distance of 80 m from the discharge port along the vessel hull, not extending past the end of the hull. The plume would also extend outward no more than a distance of 30 m from the vessel hull at any point along the hull. CH3D predicts that, during the first 24 hours after discharge, the plume would cover only 5% of the width, 2% of the length, and 0.07% of the total surface of Sinclair Inlet.
Although the modeling described above indicates that the thermal plume from steam condensate released from an aircraft carrier may exceed Washington criteria in a small, localized area, the EPA and Navy do not consider that the plume results in a significant environmental impact. Such a localized plume would have a low potential for interfering with the passage of aquatic organisms in the water body and would have a limited impact on the organisms that reside in the upper water layer (sea surface boundary layer). In addition, because the discharge is freshwater (no salinity) and warmer than the receiving water, the plume floats in the surficial layer of the water body and has no impact on bottom-dwelling organisms. Therefore, EPA and DOD do not consider that the thermal loads from steam condensate discharge have the potential to cause an adverse environmental impact.

### Steam Condensate 8 

### 4.4 Potential for Introducing Non-Indigenous Species
This discharge does not present the potential for the transport of non-indigenous species because: the source of the steam is potable water from the same geographic area; it is discharged in the same vicinity; and it enters the ship as steam above 212 ° F.

5.0 CONCLUSIONS
Steam condensate discharge has a low potential to cause an adverse environmental impact. This conclusion is based on the following two findings:

1) Although concent rations of copper, nickel, benzidine, bis(2-ethylhexyl) phthalate, phosphorous, and nitrogen exceed the most stringent water quality criteria, the mass loadings for these constituents are small. The distribution of the ships among several ports and within the ports themselves disperses the discharge (multiple discharge points) into a variety of receiving waters. 2) There are only two states that have established thermal mixing zone criteria in the form of codified plume dimensions (Washington and Virginia). The thermal criteria of other coastal states require thermal mixing zones be established on a case-by-case basis during the permitting process. The discharge is predicted to meet Virginia and Washington State thermal criteria with the exception of an aircraft carrier in the port at Bremerton, Washington.. However, conservative modeling of discharge from an aircraft carrier at Bremerton predicts thermal plumes that would cover only 5% of the width, 2% of the length, and 0.07% of the total surface of Sinclair Inlet. Since the plume is restricted to such a localized area, the EPA and DoD do not consider that the plume results in an adverse environmental impact and no further analyses are required.

6.0 DATA SOURCES AND REFERENCES

To characterize this di scharge, information from various sources was obtained. Information from a military handbook on dockside services was used to calculate the rate of discharge. Sampling data from four surface ships provided concentrations, and mass loadings were calculated from the rate and the concentrations. Table 7 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes - Steam Condensate Drain, September 12, 1996.

2. Military Handbook - 1025/2, Docksid e Utilities for Ship Service, 1 May 1988.

### Steam Condensate 9 

### 3. Naval Ship’s Technical Manual (NSTM), Chapter 220, Vol. 2, Revision 7, Boiler Water/Feed Water Test & Treatment. pp 22-6, 22-7, and 22-50. December 1995.

4. Pentagon Ship Movement Data for Years 1991-1995, M arch 4, 1997.

5. UNDS Rationale for Discharge Sampling, Undated.

6. UNDS Phase I Sampling Data Report, Volumes 1-13, October 1997.

7. NAVSEA. Thermal Effects Screening of Discharges from Vessels of the Armed Services. Versar, Inc. July 3, 1997. 8. NA VSEA. Supplemental Thermal Effects Analysis. March 1999.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.

### Steam Condensate 10 

### New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Baumeister, Theodore; Avallone, Eugene; Baumeister III, Theodore; Marks' Standard Handbook for Mechanical Engineers, Eighth Edition. McGraw-Hill Book Company, 1978. .
Rawson, K.J.; and E.C. Tupper. Basic Ship Theory 2, Second Edition, Longman Group London and New York. 1978.
Jane's Information Group, Jane's Fighting Ships. Capt. Richard Sharpe, Ed. Sentinel House: Surrey, United Kingdom, 1996.
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. 23 March 1995.
Summary of Meteorological Data to Determine Air and Water Temperatures, October 1997.
UNDS Ship Database, August 1, 1997.

### Steam Condensate 11 

### Table 1. Vessel Classes Generating Steam Condensate Discharge

VESSEL CLASS VESSEL DESCRIPTION QUANTITY OF VESSELS PER CLASS NUMBER OF

DAYS IN PORT PER YEAR CVN 68 Nimitz Class Aircraft Carriers 7 147 CV 63 Kitty Hawk Class Aircraft Carriers 3 137 CVN 65 Enterprise Class Aircraft Carriers 1 76 CV 59 Forrestal Class Aircraft Carriers 1 143 CG 47 Ticonderoga Class Guided Missile Cruisers 27 166 CGN 38 Virginia Class Guided Missile Cruiser 1 161 CGN 36 California Class Guided Missile Cruisers 2 143 DDG 993 Kidd Class Guided Missile Destroyers 4 175 DD 963 Spruance Class Destroyers 31 178 AGF 11 Austin Class Miscellaneous Command Ship 1 183 AGF 3 Raleigh Class Miscellaneous Command Ship 1 183 LCC 19 Blue Ridge Class Amphibious Command Ship 2 179 LHD 1 Wasp Class Amphibious Assault Ship 4 185 LHA 1 Tarawa Class Amphibious Assault Ship 5 173 LPH 2 Iwo Jima Class Amphibious Assault Ship 2 186 LPD 4 Austin Class Amphibious Transport Docks 3 178 LSD 49 Harpers Ferry Class Dock Landing Ships 3 170 LSD 41 Whidbey Island Class Dock Landing Ships 8 170 LSD 36 Anchorage Class Dock Landing Ships 5 215 MCM 1 Avenger Class Mine Countermeasures Vessels 14 232 T-AE 26 Kilauea Class Ammunition Ships 8 26 T-AFS 1 Mars Class Combat Stores Ships 8 148 AO 177 Jumboised Cimarron Class Oilers 5 188 T-AO 187 Henry J. Kaiser Class Oilers 12 78 AOE 1 Sacramento Class Fast Combat Support Ships 4 183 AOE 6 Supply Class Fast Combat Support Ships 3 114 T-AG 194 Mission Class Navigation Research Ships 2 151 T-AGM 22 Compass Island Class Missile Range Instrumentation Ships 1 133 T-ARC 7 Zeus Class Cable Repairing Ships 1 8 ARS 50 Safeguard Class Salvage Ships 4 208 T-AH 19 Mercy Class Hospital Ships 2 184 AS 33 Simon Lake Class Submarine Tenders 1 229 AS 39 Emory S Land Class Submarine Tenders 3 293 Notes: Number of days inport per year for each ship class taken from the Ship Movement Database. Vessel classes receiving shore steam are identified in Military Handbook 1025/2, Dockside Utilities for Ship Service.

### Steam Condensate 12 

### Table 2. Steam Condensate Discharge By Vessel Class At Outdoor Temperatures of 50 Degrees F

VESSEL CLASS ACTIVE (a) Total Heating Load in lbs/hr per vessel (b)

Condensate Drain in gallons/yr per vessel (c) Condensate Drain in gallons/yr per vessel class CVN 68 7 15,000 6,582,090 46,074,627 CV 63 3 13,000 5,316,418 15,949,254 CVN 65 1 15,000 3,402,985 3,402,985 CV 59 1 13,000 5,549,254 5,549,254 CG 47 27 1,100 545,075 14,717,015 CGN 38 1 3,400 1,634,030 1,634,030 CGN 36 2 3,400 1,451,343 2,902,687 DDG 993 4 1,800 940,299 3,761,194 DD 963 31 1,800 956,418 29,648,955 AGF 11 1 2,650 1,447,612 1,447,612 AGF 3 1 2,650 1,447,612 1,447,612 LCC 19 2 7,700 4,114,328 8,228,657 LHD 1 4 6,300 3,479,104 13,916,418 LHA 1 5 6,300 3,253,433 16,267,164 LPH 2 2 5,800 3,220,299 6,440,597 LPD 4 3 4,400 2,337,910 7,013,731 LSD 49 3 3,600 1,826,866 5,480,597 LSD 41 8 3,600 1,826,866 14,614,925 LSD 36 5 3,600 2,310,448 11,552,239 MCM 1 14 1,000 692,537 9,695,522 T-AE 26 8 2,300 178,507 1,428,060 T- AFS 1 8 3,350 1,480,000 11,840,000 AO 177 5 3,350 1,880,000 9,400,000 T-AO 187 12 3,350 780,000 9,360,000 AOE 1 4 5,600 3,059,104 12,236,418 AOE 6 3 5,600 1,905,672 5,717,015 T- AG 194 2 1,500 676,119 1,352,239 T- AGM 22 1 2,700 1,071,940 1,071,940 T-ARC 7 1 2,700 64,478 64,478 ARS 50 4 500 310,448 1,241,791 T-AH 19 2 500 274,627 549,254 AS 33 1 6,500 4,443,284 4,443,284 AS 39 3 6,500 5,685,075 17,055,224 Total = 295,504,776 Notes: Source: Military Handbook 1025/2, Dockside Utilities for Ship Service. Total heating load values include constant loads and intermittent loads. Intermittent loads were taken at 50 °F outside air temperature. Calculations based on water at 212 °F.

### Steam Condensate 13 

### Table 3. Summary of Detected Analytes

Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Mass

Loading CLASSICALS (mg/L) (mg/L) (mg/L) (lbs/yr) Alkalinity 2.78 4 of 4 1 15 6,852 Ammonia as Nitrogen 0.18 4 of 4 0.12 0.37 444 Biochemical Oxygen Demand 6.56 3 of 4 BDL 21 16,169 Chemical Oxygen Demand (COD) 16.87 2 of 4 BDL 54 41,581

Chloride 3.60 3 of 4 BDL 14 8,873 Nitrate/Nitrite 0.44 4 of 4 0.3 0.81 1,085 Sulfate 1.98 3 of 4 BDL 3.6 4,880 Total Dissolved Solids 18.9 2 of 4 BDL 102 46,585 Total Kjeldahl Nitrogen 0.80 4 of 4 0.24 2 1,972 Total Organic Carbon (TOC) 4.07 3 of 4 BDL 12 10,032 Total Phosphorous 0.09 3 of 4 BDL 0.27 222 Total Recoverable Oil and Grease 1.15 4 of 4 0.6 2.3 2,835

Total Sulfide (Iodometric) 13.3 4 of 4 4 40 32,880 Volatile Residue 18.9 2 of 4 BDL 102 46,585 METALS ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) Antimony Total 7.13 1 of 4 BDL 26.8 18 Arsenic Total 0.74 2 of 4 BDL 2.3 2 Barium Dissolved 1.02 1 of 4 BDL 4.4 3 Total 0.8 1 of 4 BDL 1.65 2 Cadmium Total 2.86 1 of 4 BDL 6.1 7 Calcium Dissolved 98.6 3 of 4 BDL 336 243 Total 146 4 of 4 61.6 334 359 Copper Dissolved 13.4 2 of 4 BDL 49.0 33 Total 20.1 3 of 4 BDL 91.0 49 Iron Dissolved 20.0 2 of 4 BDL 262 49 Total 22.6 2 of 4 BDL 527 56 Lead Dissolved 3.58 3 of 4 BDL 12.7 9 Total 4.38 3 of 4 BDL 18.9 11 Magnesium Dissolved 77.8 1 of 4 BDL 982 192 Total 77.2 1 of 4 BDL 949 190

### Steam Condensate 14 Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Mass

Loading METALS ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) Manganese Dissolved 1.17 2 of 4 BDL 6 3 Total 2.57 4 of 4 1.85 5.1 6 Molybenum Dissolved 1.72 1 of 4 BDL 3.7 4 Nickel Dissolved 10.3 1 of 4 BDL 22 25 Total 11.6 1 of 4 BDL 34.7 28 Selenium Total 2.87 1 of 4 BDL 3.5 7 Sodium Dissolved 482 3 of 4 BDL 8220 1,188 Total 432 2 of 4 BDL 8280 1,065 Thallium Dissolved 1.18 2 of 4 BDL 13.3 3 Titanium Total 2.73 1 of 4 BDL 6.4 7 Vanadium Dissolved 5.25 1 of 4 BDL 10.5 13 Zinc Dissolved 13.94 4 of 4 7.15 21.9 34 Total 11.35 3 of 4 BDL 23.0 28 ORGANICS ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) 4-Chloro-3-Methylphenol 6.84 1 of 4 BDL 30 17 Benzidine 32.8 1 of 4 BDL 73.5 81 Bis(2-Ethylhexyl) Phthalate 19.4 2 of 4 BDL 112 48

BDL = Below Detection Limit Log-normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., “non-detect” samples), estimated analyte concentrations equivalent to one-half of the detection levels were also used to calculate the log-normal mean. For example, if a“non-detect” sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the lognormal mean calculation.

### Steam Condensate 15 

### Table 4. Estimated Annual Mass Loadings of Constituents

Constituent* Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Mass

Loading CLASSICALS (mg/L) (mg/L) (mg/L) (lbs/yr) Ammonia as Nitrogen 0.18 4 of 4 0.12 0.37 444 Nitrate/Nitrite 0.44 4 of 4 0.3 0.81 1085 Total Kjeldahl Nitrogen 0.80 4 of 4 0.24 2 1972 Total Nitrogen A 1.24 3057 Total Phosphorous 0.09 3 of 4 BDL 0.27 222 ORGANICS ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) Benzidine 32.8 1 of 4 BDL 73.5 81 Bis(2-Ethylhexyl) Phthalate 19.4 2 of 4 BDL 112 48 METALS ( μ g/L) ( μ g/L) ( μ g/L) (lbs/yr) Copper Dissolved 13.4 2 of 4 BDL 49.0 33 Total 20.1 3 of 4 BDL 91.0 49 Nickel Dissolved 10.3 1 of 4 BDL 22 25 Total 11.6 1 of 4 BDL 34.7 28 * Mass loadings are presented for constituents that exceed WQC. See Table 3 for a complete listing of mass loadings. A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Steam Condensate 16 

### Table 5. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituent Log-normal

Mean Minimum

Concentration Maximum

Concentration Federal

Chronic WQC Most Stringent State

Chronic WQC ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) ( μ g/L) Ammonia as Nitrogen 180 120 370 None 6 (HI) A

Nitrate/Nitrite 440 300 810 None 8 (HI) A Total Kjeldahl Nitrogen 800 24 2000 None

-
Total Nitrogen B 1240 None 200 (HI) A Total Phosphorous 90 BDL 270 None 25 (HI) A
Benzidine 32.8 BDL 73.5 None 0.000535 (GA) Bis(2-Ethylhexyl) Phthalate 19.4 BDL 112 None 5.92 (GA)

Copper Dissolved 13.4 BDL 49.0 2.4 2.4 (CT, MS) Total 20.1 BDL 91.0 2.9 2.9 (GA, FL) Nickel Dissolved 10.3 BDL 22 8.2 8.2 (CA, CT) Total 11.6 BDL 34.7 8.3 7.9 (WA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington BDL = Below Detection Limit

### Steam Condensate 17 

### Table 6. Summary of Thermal Effects of Steam Condensate Discharge

Ship Modeled Discharge

Temp (°F) Average Air Temp (°F) Discharge

Flow (gallons per hour) Ambient

Winter Water Temp (°F) Predicted

Plume Length (m) Allowable

Plume Length (m) Predicted

Plume Width (m) Allowable

Plume Width (m)


### Washington State (1.5 ° C Δ T) CVN* 180 50 1,866 50 80 73 30 400 AOE 180 50 672 50 2.3 73 10** 400 Virginia (3.0 ° C Δ T) CVN 212 40 2,207 40 689 32,000 203 3,200 LCC 212 40 1,007 40 180 32,000 70.1 3,200 Note: Flow rates for Virginia were calculated based on a linear interpolation of the data available in reference 2 for 30 ° F and 50 ° F air temperature. *Indicates CH3D model predictions after the first 24 hours after discharge. All other predictions are based on CORMIX model results. **CORMIX output displays the plume width to the point where Δ T ≅ 0 ° C.

Table 7. Data Sources

Data Sources NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X 4.3 Thermal Effects X X4.4 Potential for Introducing NonIndigenous Species X

### Stern Tube Seals & Underwater Bearing Lubrication 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for ea ch of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the dis charge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Stern Tube Seals & Underwater Bearing Lubrication

### Stern Tube Seals & Underwater Bearing Lubrication 2 2.0 DISCHARGE DESCRIPTION
This section describes the stern tube seals and underwater bearing lubrication discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Vessels of the Armed Forces have one or two propeller shafts, except for aircraft carriers, which have four shafts. Stern tube seals, stern tube bearings, and intermediate and main strut bearings are components associated with the propeller shaft. Figure 1 shows the location of these components. The stern tube seals prevent seawater entry into the vessel at the inboard end of the stern tube bearing. Stern tube bearings support the weight of the propeller shaft where the shaft exits the vessel. Intermediate and main strut bearings are outboard bearings that support the weight of the propeller and shafting outboard of the vessel. Submarines do not have strut bearings. Instead, submarines have a self-aligning bearing aft of the stern tube that supports the weight of the propeller. Both stern tube and strut bearings are constructed with a bronze backing, and lined with rubber strips (called staves), or babbitt metal. Babbitt is an alloy of tin and lead and is commonly used as a bearing material. However, babbitted bearings are oil lubricated and the lube oil is circulated in a closed system with no discharge to the environment. Babbitt wear material is collected in the oil filter of stern tube oil lubricated systems. Depending on the vessel type, lubrication for the stern tube seals, stern tube, and strut bearings is accomplished by seawater, freshwater, or oil. 1



### Some small boats and crafts use surrounding seawater for cooling and a greased bearing for lubrication. As such, the surrounding seawater is at a greater pressure than the greased bearing on small boats, and if there is any leakage, seawater will leak into the bilge of the small boat instead of the grease being discharged to the surrounding seawater. Any grease released into the bilge of small boats and crafts is discussed in the Surface Vessel Bilgewater/OWS Discharge NOD report.

2.1.1 Seawater Lubrication
Seawater lubrication is used in all Navy and U.S. Coast Guard (USCG) vessels. Seawater is supplied from either the firemain or auxiliary machinery cooling water system on surface ships and is supplied from the auxiliary seawater system on submarines. Submarines flood their trim tanks with seawater and use this water to cool and lubricate the stern tube seals while in port. For all surface ships and submarines, seawater enters a seal cavity, where some of it is used to lubricate the seal faces. The remainder passes aft through channels between staves in the stern tube bearing, cooling and lubricating the bearing, and finally exiting to the sea at the aft end of the bearing. Seawater flow through the stern tube bearing is maintained at all times, except when conducting maintenance or disassembly, regardless of whether the vessel is in port or underway. The residence time of the seawater flow is short. For example, the residence time of water in the stern tube of a DDG 51 Class ship is approximately 13 seconds. 2 

### Similar short residence times

### Stern Tube Seals & Underwater Bearing Lubrication 3 for stern tube lubricating water on other vessel classes is expected. Strut bearings are not provided with forced cooling or lubrication. Instead, strut bearings use the surrounding seawater flow for lubrication and cooling when the vessel is underway.
On surface vessels, copper-nickel alloy (70% copper/30% nickel) piping is normally used for the stern tube seal lubrication system. On submarines, nickel/chromium piping is used. The lubricating seawater also comes into contact with the propeller shaft, bearing surfaces, zinc anodes, bearing staves, the seals, and bearing bushings.
Shafts are made of forged steel. Bearing surfaces are sleeved with copper-nickel (80% copper / 20% nickel) or fiberglass. Zinc anodes provide corrosion protection in the bearing housings. Stern tube and strut bearing staves are made of bonded synthetic rubber (typically Buna-N (nitrile)). The estimated life of the staves is 5 to 7 years. Although the staves surround the shaft on all sides, the bottom staves (approximately 40% of the staves) support the shaft weight and are susceptible to maximum wear. In submarines, the wear rate of the rubber is approximately 10 to 20 mils (one mil equals 0.001 inch) per year. In surface vessels with controllable pitch propellers, the wear rate is 40 mils per year, and in surface vessels with fixed pitch propellers, the wear rate is 20 to 30 mils per year. 3



### The rotating seat of a typical stern tube seal on a surface vessel is made of phosphor bronze (an alloy of bronze and phosphorous). The stationary face insert was originally made of Teflon-impregnated asbestos. However, a majority of the asbestos components have been replaced with a phenolic material. 1 

### Seals used in submarines are comprised of silicon carbide and carbon graphite because they are exposed to more severe operating conditions. The life of stern tube seals is approximately 5 years and they have a very small area exposed to wear, compared to the bearings. Therefore, wear products from seal components constitute a very small percentage of this discharge.
The lubricated components of a propeller shaft are shown in Figure 1. A cross-section diagram of a typical seal is provided as Figure 2.

2.1.2 Freshwate r Lubrication
On very rare occasions in port, freshwater may be used for lubricating the shaft seal on submarines. This occurs on approximately four submarines per year, for one week each. 4 

### Normally, while a submarine is in port, shaft seal lubrication is provided from seawater stored in the submarine’s trim system. After an extended in port period, this supply of seawater will eventually become depleted. At that time, freshwater is used to fill the trim system to provide shaft seal lubrication. On these occasions, a potable water fill hose from the pier is connected to the trim tank. This freshwater is typically mixed with the residual seawater in the tank (estimated at a 50% mixture of seawater and freshwater), and is used for lubricating the shaft seals. The cooling water is discharged to the sea in the manner described in Section 2.1.1.

### Stern Tube Seals & Underwater Bearing Lubrication 4 2.1.3 Ambient Water Lubrication
All Army watercraft use ambient water for lubrication of stern tube seals and underwater bearings. Ambient water, either freshwater or saltwater, is used in all operational locations, depending upon where the vessel is located (i.e., in fresh or saltwater). Army watercraft do not use potable water for lubrication while in port and do not use pressurized water to force feed underwater bearings.

2.1.4 Oil Lubrication
A number of Military Sealift Command (MSC) vessels are fitted with oil-lubricated sterntube and strut bearings, which do not produce any of the discharge described in this report. Oillubricated seals exist in a variety of configurations. All have anti-pollution design features, that prevent oil from leaking to the sea under normal operating conditions. 5 

### On the T-AO 187 Class ships, each of the two shaft systems contains 2,300 gallons of oil. Some common system design features to prevent oil releases are: 1



### • Use of multiple sealing rings at both the inboard and outboard ends of the stern tube.

• Methods to maintain pressure in the stern tube cavity lower than the sea water pressure outside. This ensures that, in the event that the outboard seal leaks, water will leak into the cavity rather than oil leaking out. Any water which accumulates as a result of a leak into the cavity is managed as Surface Vessel Bilgewater/OWS Discharge.

• Positive methods for determining seal leakage.

2.2 Releases to the Environment
For surface vessels, this discharge consists of seawater from the firemain system or auxiliary machinery water cooling water system with the additional constituents described in Section 2.1 that are entrained as the seawater flows through the system. The lubricating water is released to the environment through the after end of the stern tube bearing. In the case of submarines, the discharge will occasionally consist of freshwater with chlorine.

2.3 Vess els Producing the Discharge

Almost all classes of surface vessels and submarines of the Armed Forces have shaft seals and bearings that require lubrication. The exceptions are a few vessel classes such as the MHC 51 Class, that use unconventional means of propulsion such as cycloidal propellers. 1 

### Army watercraft use packing rings to seal hull penetrations of the shaft and do not use mechanical seals for this purpose.

### Stern Tube Seals & Underwater Bearing Lubrication 5 3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative in formation that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Flow of water through the shaft seals and stern tube bearings is maintained at all times. Therefore, this discharge occurs both within and beyond 12 nautical miles (n.m.).

3.2 Rate

3.2.1 Seawater Lubrication
For surface ships, flow rates of seawater through the stern tube bearing are approximately 2 gallons per minute (gpm) per foot of bearing length and 3 gpm for seal lubrication. The seawater flow rate through submarine shaft seals while underway is 16 gpm for SSN 688 Class and 18 gpm for SSBN 726 Class submarines. A discharge of 10 to 20 gpm per shaft is typical for most vessels. 1 

### For purposes of this report, a flow rate of 20 gpm has been used. It was assumed that there are 274 surface ships, each with two shafts and 89 submarines, each with one shaft. Based on operational knowledge, 5% of the vessels’ underway time is spent within 12 n.m. and 50% of the vessels’ time is spent pierside. 6 

### These are conservative estimates, because most vessels have flow rates that are lower than 20 gpm and though there are 24 four-shaft vessels in the Navy, there are 65 single-shaft vessels that were considered to be two-shaft vessels. Thus, this analysis overestimates the number of shafts producing this discharge by 17. When surface ships are idle in port, full water flow is maintained through the stern tube bearing and seals. The total annual fleetwide discharge volume was calculated as follows:

Total fleetwide annual discharge (gallons/year) = (20 gallons/minute flow rate) (60 min/hr) (24 hr/day) (365 days/year) [(274 surface ships) (2 shafts/ship) + (89 submarines) (1 shaft per submarine)] (0.55 (5% of vessel’s underway time is within 12 n.m. and 50% of vessels’ time is in port)) = 3,682,879,200 gal/year

3.2.2 Freshwater Lubrication
When submarines are idle in port, flow is maintained at 4 gpm for attack submarines (e.g. SSN 688 Class) and 9 gpm for Missile Submarines (e.g. SSBN 726 Class). 3,7 

### Approximately 81% of active submarines are attack submarines (SSNs) and 19% are ballistic missile submarines (SSBNs). Hence, the weighted freshwater flow rate per submarine is approximately (0.81)(4 gpm) + (0.19)(9 gpm) ≈ 5 gpm.

### Stern Tube Seals & Underwater Bearing Lubrication 6 Total fleetwide annual discharge (gallons/year) = (5 gallons/minute flow rate) (60 min/hr) (24 hr/day) (7 days/year) (1 week per year) [(4 submarines) (1 shaft per submarine)] = 201,600 gal/year

3.3 Constituents

3.3.1 Seawater Lubrication
Seawater for lubrication of stern tube bearings is supplied eithe r from the firemain or the auxiliary seawater cooling main, depending on the vessel class. Additional information on firemain systems and the seawater cooling system can be found in their respective NOD reports.
When the shaft is turning, the most likel y constituent to be present in the discharge is rubber. Metals, if any, can be present in the discharge and include copper and nickel, the materials of construction of the stern tube. The priority pollutants in this discharge include copper and nickel. None of the potential constituents in this discharge are bioaccumulators.

3.3.2 Freshwater Lubrication
Because the shaft is not turning under idle conditions, there is no wearing of the bearing materials. The freshwater from the port facility is typically chlorinated for disinfection. Therefore, the discharge could contain small amounts of chlorine plus the same priority pollutants listed in Section 3.3.1. None of the potential constituents are bioaccumulators.

3.4 Concentrations

Firemain and fre shwater are used to lubricate stern tube seals and bearings. The lubricating water briefly contacts the bearings and seals when compared to the rest of the firemain; the firemain piping system is much longer than the length of the stern tubes (5.5 feet each) and hence the residence time of seawater in the firemain system is much greater than the 13 second residence time in the stern tube seal and bearing lubrication system of a typical surface vessel. Freshwater data were also used.

3.4.1 Seawater Lubri cation
The concentrations of the constituents, as shown in Table 2, were estimated using corrosion rates for the materials of construction, the surface area of the materials exposed to seawater, and the rate of seawater lubricating the stern tube. 2



### 3.4.2 Freshwater Lubrication
Water treatment plants typically add sufficient chlorine or monochloramine so that the finished water leaving the plant has a total residual chlorine (TRC) level of approximately 2.0 mg/L. 8 

### As water flows through the distribution system, TRC is depleted through its bactericidal action and due to reactions with other chemicals in the water and on piping and other surfaces.

### Stern Tube Seals & Underwater Bearing Lubrication 7 By the time the water reaches the tap, TRC levels have been reduced to approximately 1.0 mg/L. After water is taken aboard a submarine into the trim tank and before its discharge after being used as a stern tube seal lubricant, several factors cause the TRC level to continue to decline. For example, the TRC-containing freshwater is mixed with the seawater that remains in the trim tank and as a result, is diluted by about 50% based on the fact that trim tanks are about 50% full of seawater while pierside. This results in an immediate reduction of the TRC concentration to approximately 0.5 mg/L. In addition, organic matter in the residual seawater in the trim tank will cause further rapid depletion of TRC levels. Although not measured specifically, the amount of TRC in the trim tank water used to lubricate the shaft seal is likely to be at least as low as the levels measured in the freshwater used to layup condensers in submarines. TRC levels in such systems were reduced from 1.2 mg/L to 0.028 mg/L in two hours. Please refer to the Freshwater Layup NOD report for additional information. Using the average flow rate from the trim tank, it requires approximately 17 hours to drain the trim tank.
The estimated contributions of the freshwater lubrication process to the discharge are unknown but thought to be minor. This is because the shaft is not turning while pierside so there is no bearing wear. In addition, the lubricating water only contacts the lubrication system components for a short period of time because of the constant flow of water from the trim tank, through the bearing, and then to the sea. For a typical surface ship (DDG 51 Class) the residence time of water in the stern tube is approximately 13 seconds 2 

### and similar residence times for stern tubes on other vessel classes is expected. With residence times of this order, there is little time to accumulate erosion or corrosion products from the bearing lubrication system materials of construction.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings

4.1.1 Seawater Lubrication
An estimate of the rubber discharge was made based on data for DDG 51 Class vessels. The DDG 51 Class was chosen because it is a mid-size vessel with a significant population in the fleet. The available data includes:

Stern Tube Strut Bearing Length 66 inches 96 inches Number of Staves 26 26 Stave Width 3.18 inches 3.18 inches

### Stern Tube Seals & Underwater Bearing Lubrication 8 Using this data, the total length of rubber material exposed to wear was calculated to be 351 feet per shaft by the equation:

((66 inches + 96 inches) bearing length per shaft) (26 staves per shaft)/(12 inches per foot) = 351 feet of bearing material per shaft

DDG 51 Class ships have two shafts; therefore, the total length of bearing material per ship is 702 feet. Because DDG 51 Class ships have controllable pitch propellers, a wear rate of 40 mils (0.04 inch) on each stave occurs per year. Approximately 40% of the staves carry the weight of the shafting and thus are subjected to this wear rate. The total volume of rubber that is worn annually from the staves per ship was calculated as follows:

Volume of Rubber Per Ship = (702 feet of rubber) (3.18 inches/(12 inches/foot) width of staves) (0.04 inch/(12 inches/foot) wear depth) (0.4 percentage of staves subject to wear) = 0.25 cubic feet

The density of Buna-N (nitrile) rubber is 61.8 pounds per cubic feet (lbs/ft 3 

### ). Therefore, 15.4 pounds [(61.8 lbs/ft 3 

### ) (0.25 ft 3 

### )] of rubber are contained in the discharge from each ship annually. Based upon the assumptions described in Section 3.2.1, ships spend approximately 5% of their underway time within 12 n.m. 6 

### Thus, 0.76 pound of rubber is discharged by each vessel within 12 n.m. Bearing wear does not occur while the vessel is alongside the pier or at anchor because the shafts are not turning.
Using 0.76 pound of rubber as an average for each surface ship and 0.38 pound for each submarine (due to the single shaft configuration of submarines), the total annual mass loading for 274 ships (excluding boats and crafts) and 89 submarines was calculated by the equation:

Total Annual Mass Loading of Rubber = (0.76 pound/ship) (274 ships) + (0.38 pound/submarine) (89 submarines) = 242 pounds

A total of 242 pounds of rubber is discharged annually for all vessels. This is a conservative estimate because many vessels have a wear rate of less than 40 mils per year and many surface vessels do not have two shafts.

Concentrations of rubber were then calculated as follows:

Concentration of rubber in mg/liter = (242 pounds per year) (453,600 mg/pound) / [(334,807,200 gallons per year) (3.785 liters/gallon)] = 0.09 mg/liter

The total annual mass loadings for the metal constituen ts of seawater lubrication was calculated based on materials of construction in the stern tube, corrosion rates for those materials, and the surface area of the material exposed to seawater for a DDG 51 Class ship. The material

### Stern Tube Seals & Underwater Bearing Lubrication 9 of construction is a copper-nickel alloy (80% copper and 20% nickel). The available data includes 2 

### :
Surface area exposed to seawater = 7,254 square inches (in 2 

### ) Corrosion rate of copper nickel = 7.0 micrometers per year ( μ m/ yr) Density of copper nickel = 8.9 x 10 6 

### grams per meter cubed (g/m 3 

### )

Total Annual Mass Loading of Copper and Nickel = (corrosion rate) (density) (area) (percent of time within 12 n.m.) = 160.4 grams per year

Based on these analyses, one DDG 51 stern tube has the potential to discharge 128.3 grams or 0.28 pound of copper and 32.1 grams or 0.07 pound of nickel annually within 12 n.m. of shore. Applying this estimate to all vessels of the Armed Forces results in a total annual mass loading of 180 pounds of copper and 45 pounds of nickel.

4.1.2 Freshwater Lubrication
The weighted average of the freshwater flow rate to the stern tube bearings on a submarine is approximately 5 gallons per minute (19 liters per minute) when the submarine is idle in port. Assuming a 1.0 mg/L TRC concentration in the freshwater (see Section 3.4.2) and that the freshwater will be diluted by an equal amount of seawater remaining in the trim tank when the freshwater is added, the TRC mass loading per submarine per day was calculated by the equation:

TRC Mass Loading = (Freshwater flow rate) (TRC concentration) (Dilution factor) = (19 L/min) (0.001 grams/L) (50%) (60 min/hour) (24 hours/day) = 13.7 grams TRC per day per submarine

Because submarines rarely use freshwater to lubricate the shaft seal, it is assumed that there are four submarines that use this method annually for shaft seal lubrication and each for a total of one week. Based on the assumptions in Section 2.1.2, the total annual TRC mass loading for submarines was calculated by the equation:

Annual TRC Mass Loading = (13.7 grams TRC/day/sub) (7 days/year) (4 subs) = 383 grams TRC/year = 0.383 kg TRC/yr = 0.84 pounds TRC/yr

The estimated mass loadings for this discharge are provided in Table 1.

4.2 Enviro nmental Concentrations
Table 2 shows the concentration of the priority pollutants that are present in the discharge from seawater-lubricated bearings compared to acute water quality criteria (WQC). Only copper exceeds water quality criteria. – The concentration of copper is derived from corrosion rates for copper, the surface area of the material exposed to seawater, and the rate of seawater lubricating the stern tube.

### Stern Tube Seals & Underwater Bearing Lubrication 10 The freshwater lubrication discharge from submarines consists of freshwater that cou ld have low concentrations of TRC. Although not measured specifically, the amount of TRC in the trim tank water used to lubricate the shaft seal is likely to be at least as low as the levels measured in the freshwater used to lay up boilers and condensers in submarines. TRC levels in such systems were reduced from 1.2 mg/L to 0.028 mg/L in two hours.
The rubber staves are abraded during the shaft rotation into small particles that do not dissolve, are relatively inert, and hence are largely not bioavailable.

4.3 Potential for Introducing Non-Indigenous Species
The transport of non-indigenous species is not a concern for this discharge because the flow through the shaft seals is continuous, the residence time of seawater is 13 seconds for a DDG 51 Class ship, and the seawater is not held on board for this purpose; therefore, there is little opportunity to transfer non-indigenous species. Similar residence times are expected for all other vessel classes.

5.0 CONCLUSIONS

The constituents in stern t ube seal and underwater bearing lubrication have a low potential to cause an adverse environmental effect because:

1) Oil lubricated stern tube seals and bearings cannot release oil to the environment under normal ship operations.

2) For seawater lubrica ted stern tube seals and bearings, there is very little contribution of constituents to the seawater lubrication fluid from the stern tube seal system, other than rubber, copper, and nickel because of the very short time that the fluid is in contact with the stern tube seal system. Rubber is released to the environment because the rubber bearing staves wear. Copper and nickel are introduced because they are materials of construction of the stern tube. While copper concentrations can exceed chronic WQC, the mass loadings are not considered sufficient to pose an adverse environmental effect.

3) Freshwater lubricated stern tube seals and bearings are used only on submarines and only rarely (estimated to be four submarines, each for one week per year) when the seawater in the trim tanks normally used for lubrication is exhausted. The freshwater lubrication discharge TRC concentration is expected to be as least as low as the levels measured in the freshwater used to lay up condensers in submarines.

6.0 DAT A SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Table 3 shows the sources of data used to develop this NOD report.

### Stern Tube Seals & Underwater Bearing Lubrication 11 Specific References

1. UNDS Equipment Expert Meeting Minutes - Shaft Seal Lube/S tern Tube Seals/Underwater Bearing Lubrication. September 10, 1996.

2. Personal Communication Between Miles Kikuta (MR&S) and David Kopack (SEA 00T) and Gordon Smith (SEA 03L). December 11, 1998.

3. Personal Communication Between George Stewart (MR&S) and Sanjay Chandra (Versar). April 25, 1997.

4. Personal Communication between Bruce Miller (MR&S) and LCDR Warren Jederberg, Submarine Force, Pacific Environmental Officer of 15 October, 1997.

5. Personal Communication Between George Stewart (MR&S) and Sanjay Chandra (Versar). March 14, 1997.

6. UNDS Ship Database, August 1, 1997.

7. Commander Submarine Force, U.S. Atlantic Fleet Letter 5090 Serial N451A/4270 of 13 December 1996 in Response to UNDS Data Call.

8. American Water Works Association. Optimizing Chloramine Treatment. AWWA Research Foundation, 1993.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.

### Stern Tube Seals & Underwater Bearing Lubrication 12 Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, pg 15366. March 23, 1995.
Committee Print Number 95-30 of the Committee of Public Works and Transportation of the House of Representatives, Table 1.

### Stern Tube Seals & Underwater Bearing Lubrication 13 Figure 1. Port and Starboard Shaft Lines

### Stern Tube Seals & Underwater Bearing Lubrication 14 Figure 2. Type MX9 Inboard Water Lubricated Fully Split Seal

### Stern Tube Seals & Underwater Bearing Lubrication 15 Table 1. Estimated Fleet-Wide Mass Loadings for Stern Tube Seals and Underwater Bearing Lubrication

Constituent Estimated Mass Loadings (lbs/yr) TRC 0.84 Rubber 242 Copper 180 Nickel 45

Table 2. Comparison of Calculated Data with Water Quality Criteria ( μ g/L)

Constituents Calculated

Concentration Log-normal Mean Effluent Federal

Chronic WQC Most Stringent State Chronic WQC

TRC NA* 7.5 (CT, HI, MS, NJ, VA, WA) Total Copper 5.8 2.9 2.9 (FL, GA) Total Nickel 1.5 8.3 7.9 (WA) Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995)

CT = Connecticut MS = Mississippi FL = Florida NJ = New Jersey GA= Georgia VA = Virginia HI = Hawaii WA = Washington

NA* = Not available. Concentrations estimated in Section 3.4.2.

### Stern Tube Seals & Underwater Bearing Lubrication 16 Table 3. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X X 3.4 Concentrations X X 4.1 Mass Loadings X X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Submarine Acoustic Countermeasures Launcher Discharge 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Submarine Acoustic Countermeasures Launcher Discharge

### Submarine Acoustic Countermeasures Launcher Discharge 2 2.0 DISCHARGE DESCRIPTION
This section describes the submarine acoustic countermeasures launcher discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Navy submarines are equipped with acoustic countermeasures devices that, once launched, improve submarine survivability by generating sufficient noise to be observed by hostile torpedoes, sonars, or other monitoring devices. The only acoustic countermeasure systems used by the Navy that result in a discharge are Countermeasures Set Acoustic (CSA) Mk 2 launch systems. Other countermeasures systems do not generate a discharge within 12 nautical miles because their launch tubes are always open to the ocean. 1 

### Countermeasures devices are launched from the CSA Mk 2 systems for training purposes.

The CSA Mk 2 system encompasses the countermeasure device, a gas generator, an externally-mounted launch tube, and all associated electronic controls for the countermeasure device. Figures 1 and 2 provide the location of the launch tubes on submarine hulls, and the location of components within the launch tube, respectively. Figure 3 shows the mechanism by which gas is captured within the launch tube. A gas generator at the rear of the launch tube provides the propulsive charge for launch of the countermeasure device. When the generator is activated, hot gasses expand, forcing a metal “ram” plate and the countermeasure device out of the launch tube. The ram plate lodges in the end of the launch tube, which forms a watertight end cap after launch. For vessel and crew safety, a check valve and bleed holes in the ram plate are used to allow equalization of internal gasses and liquids with external pressures that vary as the submarine changes depth. The one-way check valve allows seawater to flow into the tube after launch, but does not allow any of the liquids to be released through the opening. The seawater that flows into the tube mixes with the gasses generated by the ammonia perchlorate gas generation propellant, which results in an acidic liquid. The ram plate contains three 3/8-inch diameter bleed holes with plugs that dissolve approximately 3 days after the launch, allowing limited contact between the tube contents and the environment. 2 

### Each launch assembly, with the exception of the acoustic countermeasure device, is identical on all submarines, regardless of vessel class or hull location.
While the submarine is underway and the launch tubes are underwater, the bleed holes allow some exchange of the launch tube liquid contents with the seawater outside of the launch tube. Actual discharge rates are very difficult to obtain due to the non-homogeneous nature of the liquid mixture, the continuous dilution of the liquid contents through the bleed holes, and variations in seawater flow surrounding the bleed holes due to changes in submarine speed and maneuvers. On some submarines, launch assemblies are located above the waterline when the submarine is traveling on the ocean surface. On these submarines, most of the liquid contents of the launch assemblies drain freely from the bleed holes onto the submarine hull before entering the water. The location of the bleed plug holes prevent the expended launch tube from

### Submarine Acoustic Countermeasures Launcher Discharge 3 completely draining; approximately one-quarter to one-half gallon (1 to 2 liters) of the liquids remain, depending on the orientation of the ram plate within the launch tube. 1 

### On other submarines where the launch assembly is always below the water surface, the liquid drains through the same bleed holes directly into the harbor during the assembly’s replacement.
In order to protect workers from exposure to the potentially acidic water that remains in the tube subsequent to launch, the Navy has started adding a one-pound packet of sodium bicarbonate to the system to neutralize pH levels. 3 

### Also, the Navy is reducing cadmium in the discharge by removing hardware with cadmium-containing coatings from Navy stock. 3 

### All launchers will be equipped with these changes by the end of March 1999. 4



### 2.2 Releases to the Environment
Within three days following the launch of a countermeasure device, bleed hole plugs in the ram plate dissolve, which allows pressure equalization of the launch assembly contents with the external seawater environment. The liquid contents of the launch tube are slowly exchanged with seawater through these bleed holes while the submarine is moving. While the submarine is stationary, little or no exchange with seawater occurs. For the submarines where the launch tubes are located above the waterline, most of the liquid contents of the launch tube freely drain through the bleed holes each time the submarine surfaces. For the submarines with launch tubes located below the waterline, the major discharge occurs when the tubes are replaced pierside while the submarine is stationary. The largest potential volume discharge event would occur when all countermeasure launch tubes have been expended, there has been no discharge through the bleed holes while the submarine was underway, and all launch tube contents are released at one time in port. Therefore, for this analysis, it was assumed that all of the discharge from the CSA Mk 2 system occurs during pierside replacement of the launch assembly.

2.3 Vessels Producing the Discharge
The CSA Mk II system is installed on 24 Navy submarines of two different classes: four vessels of the Ohio (SSBN 726) Class, and 20 vessels of the Los Angeles (SSN 688) Class. Launch assemblies on Ohio Class vessels are located above the waterline when the submarine is surfaced; assemblies on Los Angeles Class vessels are located below the waterline. In addition, the number of launch assemblies differs by vessel class. Ohio Class vessels have 16 launch assemblies while Los Angeles Class vessels have 14 assemblies. 2 

### Neither the Army, Air Force, U.S. Coast Guard, nor Military Sealift Command own or operate submarines.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

### Submarine Acoustic Countermeasures Launcher Discharge 4 3.1 Locality
Submarine countermeasures operat ions during training exercises typically occur outside of 12 n.m. in the open ocean. Discharges from launch tubes located above the waterline may occur within and beyond 12 n.m. while the submarine is underway on the surface as the effluent drains from the bleed holes. Some additional leakage from these launch tubes could occur pierside while the launch tubes are removed from the submarine. Discharges from launch tubes located below the waterline could also occur pierside when the launch tubes are offloaded. A small amount of exchange between all submerged launch tubes and the surrounding waters could occur continuously within and beyond 12 n.m.

3.2 Rate
The volume of the launch tube is approximately 17 gallons (65 liters). Approximately 60 expended launch tubes are removed annually fleetwide. 2 

### Therefore, approximately 1020 gallons of effluent is generated per year. For the purposes of this report, the discharge event volume was assumed to be 17 gallons, although in the cases where launch assemblies are above the waterline, some of the launch tube effluent would be discharged prior to a launch assembly replacement operation, and under normal circumstances even those tubes located below the waterline do not discharge their entire contents.
When a submarine is traveling on the ocean surface, liquid contents of the launch assemblies that are located above the waterline were estimated to discharge at a rate of one gallon per minute through bleed holes. During a discharge event in port, the liquid contents are released through the same bleed holes while being transported from the submarine to the pier, and therefore also discharge at a rate one gallon per minute. For the purposes of this report, it was assumed that all liquids in the launch assembly are discharged into surrounding waters before the assembly is placed on the pier.

3.3 Constituents
Table 1 summarizes the analytical data from sampling of an actual gas generator and launch tube assembly, with a sodium bicarbonate packet in place and no cadmium-containing coatings. 5 

### The constituents detected in sampling, i.e., lead, copper, cadmium, and silver, were expected based upon the known components of the gas generator (e.g., ammonia perchlorate propellant), hardware coating components, and solder within the system electronics. 1 

### In addition to analyzed concentrations, based upon knowledge of the components of the gas generator, exhaust gas products that may become a part of the discharge can include hydrochloric acid, carbon dioxide, water vapor, carbon monoxide, nitrogen, alumina, iron (II) chloride, titanium dioxide, hydrogen, and iron (II) oxide. 6 

### Table 2 provides a complete listing of the types and quantities of gas generator exhaust gas products. Of the discharge constituents, lead, copper, cadmium, and silver are priority pollutants. There are no bioaccumulators that have been identified in this discharge.

3.4 Concentrations

### Submarine Acoustic Countermeasures Launcher Discharge 5 Table 1 provides a summary of the analytical results obtained from sampling of the launch tube water immediately following a launch, and sampling five days after launch. 5 

### Of the two data sets, the analytical data from sampling five days after launch is more representative of the actual pierside discharge because typical submarine operational schedules do not allow for immediate replacement of the launched countermeasures devices. In reality, submarines usually continue for months until a scheduled maintenance port call results in a launch tube change out and discharge of launch tube water. For the data shown in Table 1, where a concentration value was found to be below the detection limit, the mean concentration value was calculated using one-half of the detection limit. The pH of the launch tube water five days after launch was 7.2, which is similar to the pH of seawater (~8).

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
The total annual discharge volumes provided in Section 3.2 were used to estimate potential constituent mass loadings as follows:

Analytical data from sampling five days after launch was used to calculate mass loadings because that data set is more representative of the actual pierside discharge than data from sampling immediately following launch. Even this overstates the potential mass loading, as most submarines will continue to operate for months after the launch, before changing the launch tubes. For example, the mass loading for copper was estimated as:

(80 μ g/L)(1020 gal/yr)(3.785)(2.205)(10 -9 

### ) ≈ 7 x 10 -4 

### lbs/yr, or approximately 2 ten-thousandths of an ounce per discharge event

Table 3 provides annual fleet-wide mass loadings and discharge event mass loadings for the metallic constituents listed in Table 1.

4.2 Environmental Concentrations Mass Loading (lbs/yr) = (avg. concentrations in μ g/L) (discharge in gal/yr) (3.785 L/gal) (2.205 lb/kg) (10 - 9 

### kg/ μ g)

### Submarine Acoustic Countermeasures Launcher Discharge 6 Table 4 compares the concentrations of the Mk 2 system discharge to Federal and the most stringent state water quality criteria (WQC). Copper, cadmium, and silver concentrations are above both the Federal and most stringent state WQC. Lead was detected in only one of the ten samples; lead in this sample exceeded the most stringent state WQC.

4.3 Potential For Introducing Non-Indigenous Species
There is a low potential for this discharge to transport non-indigenous species because:

1) the 17-gallon launch tube is capped immediately following the launch of a countermeasure device, with the only means of seawater entry being a one-way check valve and three 3/8-inch diameter bleed holes. Therefore, there is limited opportunity for organisms to ever enter the launch tube; 2) because launches of countermeasure devices are estimated to take place 60 times a year fleetwide and typically take place in the open ocean; 3) any deep ocean water organism would be unlikely to survive in near-shore waters. 7 

### 4) the total volume of the discharge per year is small.

5.0 CONCLUSION
Submarine acoustic countermeasures launcher discharge has a low potential to cause an adverse environmental effect from constituents and the introduction of non-indigenous species because:

1) The cons tituent mass loading is low. For example, the mass loading of copper intoreceiving waters during one of the 60 discharge events per year would be two tenthousandths of an ounce.

2) The small volume of the discharge, combined with the low likelihood that the organisms taken on could survive in port, make it unlikely that the discharge could transport viable non-indigenous species.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Equipment expert information was used to estimate the rate of discharge. The constituents and concentrations in this discharge were obtained from process knowledge and analytical data. Table 5 shows the sources of the data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting - Submarine Acoustic Countermeasures Launcher Discharge, 12 June, 1998.

### Submarine Acoustic Countermeasures Launcher Discharge 7 2. UNDS Data Call Response, Countermeasure Set, Acoustic (CSA) Mk 2, PMS415D5, Naval Sea Systems Command, 20 February 1998.

3. Enginee ring Change Proposal (ECP) CR-GG77-E0002, Naval Surface Warfare Center (NSWC) Crane Division, 5 April 1997.

4. Personal Communication between Ken Burt, PMS415, Naval Sea Systems Command, and Gordon Smith, SEA 03L, Naval Sea System Command, 23 February 1998.

5. Analysis of Products from Expended Propellant Billet Gas Generators, Naval Surface Warfare Center, Crane, Code 4052, Ser 4052/7073, 13 May 1997.

6. Excerpts from Naval Surface Warfare Center (NSWC) Crane Division Preliminary Report for the Saltwater Immersion and Pressure Testing of the ADC Mk 3 Mod 0 with Lithium Battery, EDD 95-068, NSWC Crane Division, May 1995.

7. “Stemming the Tide,” Controlling Introductions of Nonindigenous Species by Ships’ Ballast Water, Committee on Ships’ Ballast Operations, National Academy Press, Washington D.C., 1996, p. 36.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.

### Submarine Acoustic Countermeasures Launcher Discharge 8 Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Submarine Acoustic Countermeasures Launcher Discharge 9 

# UNCLASSIFIED Launched Rack Detailed View Launch Control Panel CSA MK 2 MOD 0 Trident Configuration

CSA MK 2 MOD 1 SSN 688I Dihedral Configuration Dihedral Detailed View



### Figure 1. Configuration of CSA Mk 2 Launchers on SSBN 726 and SSN 688 Class Vessels

### Submarine Acoustic Countermeasures Launcher Discharge 10 UNCLASSIFIED Countermeasure Ram Plate Launch Tube Gas Generator

One Way Check Valve Bleed Plug



### Figure 2. Location of Countermeasures Launcher Components Within a Launch Tube

### Submarine Acoustic Countermeasures Launcher Discharge 11 7.5”

Cap Countermeasure 122.3”

Gas Generator

Ram Plate Stop Ramp

Captured Gas



# UNCLASSIFIED

Figure 3. Countermeasure Launch Process

### Submarine Acoustic Countermeasures Launcher Discharge 12 Table 1. Constituent Concentration Data Immediately and Five Days Following Launch 5

Constituent Dissolved Concentrations Immediately

Following Launch Mean value Dissolved Concentrations Five Days Following Launch Mean value Metals μ g/L Barium BDL a BDL BDL BDL BDL BDL BDL BDL BDL a BDL BDL BDL BDL BDL BDL BDL Lead BDL b BDL BDL BDL BDL BDL 200 110 BDL b BDL BDL BDL BDL BDL BDL 100 Copper 100 160 290 800 180 860 260 380 70 40 70 90 60 170 80 80 Cadmium 70 630 60 740 120 290 440 340 40 150 100 20 20 90 30 60 Chromium BDL c BDL BDL BDL BDL BDL BDL BDL BDL c BDL BDL BDL BDL BDL BDL BDL Silver BDL d 20 BDL 20 BDL 40 20 20 20 BDL d BDL BDL BDL 30 BDL 10 Other pH 7.2 6.0 6.0 5.7 6.3 5.3 5.9 5.8* 7.5 7.1 6.9 7.0 7.4 7.2 7.5 7.2*

a BDL = below detection limit; detection limit for barium is 1000 μ g/L
b Detection limit for lead is 200 μ g/L

c Detection limit for chromium is 80 μ g/L
d Detection limit for silver is 20 μ g/L

* Mean pH calculated using arithmetic average of [H+] values



### Table 2. Gas Generator Exhaust Gas Products 6



### Exhaust Gas Product Mass per Gas

Generator (g) HCl 23.036 CO 2 

### 21.860 H 2 

### O 16.846 CO 14.096 N 2 

### 9.345 Al 2 

### O 3 

### 2.832 FeCl 2 

### 2.068 TiO 2 

### 1.998 H 2 

### 1.803 FeO 1.523 P 2 

### 0.002 PN 0.054 CH 4 

### 0.004 NH 3 

### 0.001 FeCl 3 

### 0.001 PO 2 

### 0.001 PO <0.001 PH 3 

### <0.001 Table 3. Estimated Annual Mass Loadings

### Submarine Acoustic Countermeasures Launcher Discharge 13 Constituent Loading (lbs/yr) Loading per Discharge Event* (ounce/event) Cadmium 0.0005 0.0001 Copper 0.0007 0.0002 Lead 0.0009 0.0002 Silver 0.00009 0.00002

* based upon 60 maximum-volume discharge events per year



### Table 4. Comparison of Discharge Constituents with Water Quality Criteria ( μ g/L)

Constituent Mean Concentration

or Value Federal Acute WQC Most Stringent State Acute WQC Cadmium 60 42 9.3 (FL, GA) Copper 80 2.4 2.4 (CT, MS) Lead 100 210 5.6 (FL, GA) Silver 10 1.9 1.2 (WA)

FL = Florida GA = Georgia CT = Connecticut MS = Mississippi WA = Washington



### Table 5. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X

3.1 Locality X 3.2 Rate X X 3.3 Constituents X X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Submarine Bilgewater 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Submarine Bilgewater

### Submarine Bilgewater 2 2.0 DISCHARGE DESCRIPTION
This section describes the submarine bilgewater discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Bilgewater in submarines is a mixture of discharges and leakage from a wide variety of sources, which drain to the lowest compartment (bilge) of the submarine. Bilgewater includes seawater accumulation, normal water leakage from machinery, and fresh water washdowns. It can contain a variety of constituents including cleaning agents, solvents, fuel, lubricating oils, and hydraulic oils. 1



### The submarine’s drain system has a series of non-oily bilge collecting tanks, oily bilge collecting tanks, and a waste oil collecting tank or tank complex. The Ohio (SSBN 726) Class ballistic missile submarines and the planned New Attack Submarine (NSSN) use a waste oil collecting tank complex partitioned into oily and clean sides. Los Angeles Class (SSN 688) attack submarines use a waste oil collecting tank without the partitioning, where gravity separation of oil occurs. 1



### Non-oily waste is sent via a segregated drain system to the nonoily bilge collecting tanks, where it is discharged overboard. Waste that is oily or could possibly be oily, goes to the waste oil collecting tank (WOCT) through a separate drain system. Submarine classes with partitioned tanks, as listed above, use gravity separation enhanced by tank baffles to achieve some measure of oil/water separation. The SSN 688 Class submarines use the aft bilge collecting tank (ABCT) to receive and settle the bilgewater and non-oily drainage. The bottom portion of the water as separated in the tank is discharged overboard. 2 

### The upper portion of the ABCT which would have any potential for containing oily waste is transferred to the WOCT. The lower portion of the WOCT can be pumped overboard outside of 50 nautical miles (n.m.), but the upper portion must be held for future transfer to appropriate shore/disposal facilities. 1



### While most submarines of the U.S. fleet operate as described above, the Sturgeon Class (SSN 637) has bottomless bilge collecting tanks open to the sea, from which water is discharged by displacement whenever bilge pumps are activated. Watches are set to monitor for a sheen whenever oily water is to be pumped to the tank in port; pumping to the bilge collecting tank is to cease if a sheen is reported. 1



### 2.2 Releases to the Environment
Onboard SSN 688 Class submarines, clean drains and the lower portion, or water phase, of the separated bilgewater in the ABCT are pumped overboard as necessary regardless of distance from shore. The lower portion of the liquid in the WOCT can be disposed of outside of 50 n.m. 2 

### The upper portion, or oily waste, from all of the drains, bilge water, and other sources must be held on board until the submarine has access to appropriate shore or disposal facilities.

### Submarine Bilgewater 3 2.3 Vessels Producing the Discharge
The Navy currently operates five classes of submarines (presented in Table 1) that generate bilgewater. However, not all of these classes discharge bilgewater to the environment. Pierside, submarine bilgewater is transferred to shore facilities. In transit, SSBN submarines do not discharge bilgewater within 12 n.m. SSN 688 Class submarines discharge some of the water phase of the bilgewater collecting tank between 3 and 12 n.m. 3



### 3.0 DISCHARGE CHARACTERISTICS

T his section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
In most submarine classes, submarine drain and plumbing drain systems are used to receive all drains and route them to their respective holding tanks. In these classes, discharges which may contain any oily waste are not to be released within 50 n.m., except in emergencies. Per OPNAVINST 5090.1B, submarines are instructed to: 2



### ...pump all oily waste to the waste oil collection tank (WOCT). When the tank is full, after allowing for adequate separation time, and the ship is outside 50 n.m. [nautical miles ] , submarines shall pump the bottom, water phase of the WOCT overboard.
The upper, oil phase from the WOCT is discharged only to authorized shore facilities.
The location of this discharge varies by class and the activities of the submarine. The operational factors that affect the location of bilgewater discharge include the operating depth, type of operations, the submarine’s requirement for quiet operations, and the duration of the operations.
SSBN 726 Class submarines discharge all bilgewater either to shore facilities when pierside, or hold bilgewater for discharge when outside 50 n.m. The SSN 688 Class discharges some of the water phase of the bilgewater collecting tank between 3 and 12 n.m. due to the limited size of the holding tank. 3 

### For the SSN 637 Class submarines, discharges of bilgewater can occur at any location when the bilge pumps are activated. 1



### 3.2 Rate
The rate of this discharge varies considerably by class and with the submarine activities. The volume of bilgewater generated can depend on the crew size, operating depth, the

### Submarine Bilgewater 4 submarine’s requirement for quiet operations, the type of operations, the duration of operations, and their location.
As shown in Table 1, there are three major submarine classes which generate bilgewater. These are the SSBN 726 Class, the SSN 688 Class, and the SSN 637 Class. The SSN 637 Class submarines are currently being phased out of service. At the present time, the entire class is expected to be retired by the year 2001. 4 

### Because of this, total discharge rates for SSN 637 Class submarines will not be estimated.

Pearl Harbor Naval Station estimates that 2,000 to 3,000 gallons of bilgewater are generated per submarine per day when pierside; the classes of vessels were not specified. 5 

### For the SSBN 726 and SSN 688 Class submarines, the following annual per-vessel flow estimates were provided: 3



### SSBN 726 31,500 gallons to shore facilities

0 gallons while transiting within 12 n.m. 300,000 gallons outside 12 n.m.

SSN 688 54,000 gallons to shore facilities

80,540 gallons while transiting within 12 n.m. 400,200 gallons outside 12 n.m.

Available data ind icate that for the other submarine classes, no bilgewater is discharged within 50 n.m. Since bilgewater transferred to shore facilities is not released to the environment, the above information indicates that only the SSN 688 Class submarines actually discharge submarine bilgewater within 12 n.m. from shore.
Based on the value of 80,540 gallons per submarine per year discharged from the SSN 688 Class vessels between 3 and 12 n.m., a total flow was calculated as follows:

(80,540 gal/vessel/year) (56 SSN 688 Class subs) = 4.5 million gallons/year

3.3 Constituents
Potential constituents which have been detected in previous studies include oil and grease, copper, cadmium, lead, nickel, iron, zinc, mercury, lithium bromide, citric acid, chlorine, phenol, cyanide, sodium bisulfite, and the pesticides heptachlor and heptachlor epoxide. Submarine bilgewater could possibly have high levels of total suspended solids (TSS) and chemical oxygen demand (COD). 6,7



### Heptachlor, heptachlor epoxide, phenol, cyanide, copper, cadmium, lead, nickel, silver, and zinc are priority pollutants. Mercury is the only bioaccumulator.

3.4 Concentrations

### Submarine Bilgewater 5 Table 2 summarizes concentration data from a sampling effort involving 10 submarines. Samples in that program were analyzed for oil, 13 metals, pesticides, PCBs, and 46 organics (vinyl chloride and 45 semivolatile organics). 6,7 

### The sampling involved four SSBN 726 Class submarines, four SSN 688 Class submarines, and two SSN 637 Class submarines. Samples were taken from submarines that held their bilgewater while operating. Samples are representative of discharges normally made outside 12 n.m.
Samples from open bilge compartments on all three classes of submarines were found to contain an average of 20 parts per million (ppm) oil; bilgewater tanks averaged 76 ppm oil. In calculating arithmetic averages, six samples having values of greater than 1,000 ppm oil were excluded. These were considered not representative of bilgewater discharged within 12 n.m. and would be handled normally as waste oil and retained for shore disposal. These six samples ranged from 1,030 to 820,000 ppm of oil. The arithmetic average of the 52 oil samples, ranging between the detection limit of 5 ppm and 1,000 ppm, is 30 ppm. Including the 23 nondetects, the result would be an arithmetic mean of 22.3 ppm when each non-detect sample was set equal to the detect limit of 5 ppm.
Each sample was also analyzed for 13 metals. Eighteen pesticides, 7 PCBs, 45 semivolatile organics (base neutral aromatics), and one volatile organic (vinyl chloride) were analyzed for in the 81 samples. Table 2 presents concentration ranges and the average concentration calculated. No PCBs, semivolatiles, or vinyl chloride were detected in any sample. Six of the 81 samples contained detectable levels of the pesticides heptachlor and heptachlor epoxide. 6,7



### 4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
The total annual mass loadings were calculated based upon the estimated discharge volume for SSN 688 Class vessels and the average concentrations of constituents in submarine bilgewater. The results are presented in Table 3.

4.2 Environmental Concentrations
Concentration data presented in Table 2 are measured concentrations in the discharge, and do not reflect any dilution afforded by the receiving water.
Table 4 shows the water quality criteria (WQC) that are relevant to submarine bilgewater,

### Submarine Bilgewater 6 and compares measured concentrations of constituents to WQC. Reported levels of oil and grease for bilgewater exceed the Federal and the most stringent state WQC. Mercury, heptachlor, and heptachlor epoxide exceed the most stringent state WQC. Average measurements of constituents in the discharge exceed the Federal and the most stringent state WQC for copper, nickel, silver, and zinc. While there is no relevant Federal WQC, chlorine concentrations exceed the most stringent state WQC. Cadmium concentrations exceed the most stringent state WQC, but do not exceed the Federal WQC.

4.3 Potential for Introducing Non-indigenous Species
Non-indigenous species are not likel y to be transported by submarine bilgewater. There is limited seawater access to bilge compartments. Bilgewater storage capacity limitations require processing bilgewater on a frequent basis, resulting in discharge in the same geographic area in which it was generated.

5.0 CONCLUSIONS
Concentration data from submarine bilgewater were used to estimate constituent loadings within 12 n.m. from shore. These data and estimates were based on the existing management practices (i.e. shoreside bilgewater collection, discharging only the water phase, and refraining from discharging within 12 n.m.). Discharges between 3 and 12 n.m. occur while the vessels are underway thereby dispersing the pollutants. Removal of the existing practices could significantly increase amounts of constituents discharged above WQC and discharge standards, especially oil. Submarine bilgewater could potentially be discharged in port if these existing practices were not in place. Therefore, submarine bilgewater, uncontrolled, has the potential to cause an adverse environmental effect.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Table 5 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting Minutes, Submarine Bilgewater. August 12, 1996.

2. OPNAVINST 5090.1B. Environmental and Natural Resources Program Manual. November 1, 1994.

3. Data Call Response, Commander, Submarine Force, U.S. Atlantic Fleet. Sub marine Discharge Questionnaire. December 13, 1996.

4. Personal Communication Between Mr. R.B. Miller (M. Rosenblatt & Son, Inc.) and Mr.

### Submarine Bilgewater 7 Paul Murphy (NAVSEA PMS 392A33) of October 15, 1997.

5. Data Call Response, Pearl Harbor Naval Station. October 11, 1996.

6. Bilge Water Sampling Study. Final Report. September 30, 1996. Electric Boat Corporation.

7. NSSN Review, June 5, 1996. Subject: Fleet Bilge Water Sampling. Presented by: James Triba, NSSN Seawater Systems, Electric Boat Corporation.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural

### Submarine Bilgewater 8 Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. 23 March 1995.

### Submarine Bilgewater 9 Table 1 . Submarines Producing Bilgewater Discharges

Vessel Class Description of Vessel Number of Vessels SSBN 726 Ohio Class Ballistic Missile Submarine 17 SSN 637 Sturgeon Class Attack Submarine 13 SSN 640 Benjamin Franklin Class Attack Submarine 2 SSN 671 Narwhal Class Attack Submarine 1 SSN 688 Los Angeles Class Attack Submarine 56

Table 2. Concentrations of Contaminants in Submarine Bilgewater Discharge (mg/L) 6,7

Parameter Range (mg/L) Arithmetic Mean (mg/L)* Oil <5 - 820,000 30 mg/L (note a) Arsenic <0.01 <0.01 Barium <0.01 - 3.3 0.014 Cadmium <0.005 - 0.2 0.02 Chromium <0.01 - 1.7 0.050 Copper 0.065- 15 1.42 Iron <0.2 - 20 1.89 Lead <0.01 - 0.074 0.01 Manganese <0.01 - 1.7 0.12 Mercury <0.0002 - 0.0007 0.00007 Nickel <0.04 - 11 0.98 Selenium <0.005 - 0.021 0.005 Silver <0.01 - 0.035 0.006 Zinc <0.02 - 11 1.36 Heptachlor 0.000005 17 other pesticides note b Heptachlor epoxide 0.000003 PCBs <0.001 <0.001 1 VOA plus 45 SVOAs note c note b Ammonia <0.1 - 68 6.95 Chlorine 0.0 - 1.6 0.21 COD <15 - 4500 595 Cyanide <0.01 - 0.03 0.004 pH 2.94 - 8.95 6.9 Phenols <0.01 - 5.4 0.19 Surfactants ND - 0.807 0.16 TSS <7 - 2400 177 Note a - The average of 30 mg/L provided in the primary reference 6 omitted all nondetects and all (six) oil values > 1,000 milligrams per liter (mg/L). The average of the 75 samples less than 1,000 ppm (including nondetects, assumed to equal the detection limit) is 22.3 mg/L. Note b - No samples had detectable levels. Note c - VOA is volatile organic analyte; SVOA is semivolatile organic analyte Values preceded by “<” are non-detects

### Submarine Bilgewater 10 Table 3. Estimated Mass Loadings of Constituents from Submarine Bilgewater Discharges (lbs/yr)

Pollutant Concentration (mg/L) 688 Class 3-12 n.m. Oil 30.01 1130 Copper 1.42 53.4 Lead 0.01 0.38 Nickel 0.98 36.9 Silver 0.006 0.23 Zinc 1.36 51.2 Ammonia 6.95 262 Chlorine 0.21 7.90 Barium 0.014 0.53 Cadmium 0.02 0.75 Chromium 0.05 1.9 Mercury 0.00007 0.0026 Selenium 0.005 0.19 Heptachlor 0.000005 0.00019 Cyanide 0.004 0.15 Phenol 0.19 7.15 Surfactants 0.16 6.02

### Submarine Bilgewater 11 Table 4. Comparison of Measured Constituent Values and Water Quality Criteria ( μ g/L)

Constituent Average

Concentration Federal Acute WQC Most Stringent State Acute WQC Mercury * 

### 0.07 1.8 0.025 (FL, GA) Heptachlor 0.005 0.053 0.00011 (GA) Heptachlor epoxide 0.003 0.053 0.00021 (FL) Phenol 190

- 170 (HI) Cyanide 4 1 1 (CA, CT, FL, GA, HI, MS, NJ, VA, WA) Oil 3,0010 visible sheen a 

### / 15,000 b 

### 5000 (FL) Copper 1420 2.4 2.4 (CT, MS) Nickel 980 74 8.3 (FL, GA) Silver 6 1.9 1.2 (WA) Zinc 1360 90 84.6 (WA) Chlorine 210

- 10 (FL) Cadmium 20 42 9.3 (FL, GA)
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

CA = California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi NJ = New Jersey VA = Virginia WA = Washington

* Bioaccumulator

a Discharge of Oil , 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. b International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS)

### Submarine Bilgewater 12 Table 5. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment Data Call responses X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality Data Call responses X 3.2 Rate Data Call responses X 3.3 Constituents X X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Submarine Emergency Diesel Engine Wet Exhaust 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Submarine Emergency Diesel Engine Wet Exhaust

### Submarine Emergency Diesel Engine Wet Exhaust 2 2.0 DISCHARGE DESCRIPTION
This section describes the submarine emergency diesel engine wet exhaust liquid discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
All submarines have emergency diesel engines for use during emergency situations, such as providing electric power or emergency ventilation. However, emergency diesel engines are routinely used during training exercises, pre-underway checks, and quarterly performance analyses. All submarines have air induction and diesel exhaust systems for emergency diesel engines. Air induction systems bring in outside air for combustion in the emergency diesel engines, while exhaust systems discharge the combustion by-products overboard. Prior to discharge, the exhaust gases are cooled by seawater injection into the exhaust. Water is injected to reduce radiant energy from the exhaust piping and to reduce corrosion of the exhaust piping from high temperatures.
Each submarine is equipped with one emergency diesel engine. Refer to Figure 1 and Figure 2 for a representation of the wet exhaust system.

2.2 Releases to the Environment
The exhaust-water mixture is vented from the exhaust stack into the atmosphere. Some of the water mist with entrained or dissolved exhaust products will settle into the seawater surrounding the exhaust stack. For the purposes of this analysis, it is assumed that all of the discharge settles to the water’s surface.

2.3 Vessels Producing the Discharge
The Navy is the only branch of the Armed Forces that operates submarines. All active submarines in the fleet produce this discharge. For this report, information on the discharge rates from the three main submarine classes was used, representing 86 of the 89 active submarines. The classes of submarines producing emergency diesel wet exhaust discharge analyzed in this report are summarized in Table 1.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

### Submarine Emergency Diesel Engine Wet Exhaust 3 3.1 Locality
Each vessel operate s the emergency diesel engine an average of 60 hours annually within 12 n.m. of shore.

3.2 Rate
Table 1 provides discharge rates for individual classes of submarines. Discharge rates vary for each vessel class, from approximately 7 gallons per minute (gpm) to 15 gpm, and are dependent on the water injection rate into the exhaust system. 1,2,3,4 

### For this analysis, it was assumed that all of the water injected into the exhaust system is eventually discharged to the receiving water body. This represents an overestimate for total flow volumes, because much of the injected seawater has the potential to vaporize.

3.3 Constituents
Constituents of exhaust from diesel engines include both organic and inorganic substances. These substances originate primarily from the diesel fuel and also from engine lubricants. Most of the substances that originate from the diesel fuel are products of combustion. Some diesel fuel can pass through the engine unburned, along with combustion products in the exhaust. 5



### Inor ganic substances in diesel exhaust include combustion products such as carbon dioxide (CO 2 

### ), carbon monoxide (CO), oxides of nitrogen (NO x 

### ), oxides of sulfur (SO x 

### ), and metals. The specific substances and their concentrations in the exhaust depend on a number of factors, including the composition of the fuel, engine temperature, engine use, and engine condition. Many of the organic substances in diesel exhaust condense into particulates, that is, the oily soot visible in the exhaust. 6



### Standard air emis sions factors for large stationary diesel industrial engines were used to study the constituents in this discharge. EPA has published emission factors for large stationary diesel engines 600 hp and over. These emissions factors relate quantities of released materials to fuel input, as nanograms per Joule (ng/J), or as power output, as in grams per horsepower-hour (g/hp-hr). Although intended for stationary industrial diesel engines, these emission factors can be used to approximate emergency diesel engine emissions. 6



### Table 2 lists the emission factors for constituents present in the air exhaust of large diesel engines. 6 

### As the cooling water is injected into the air exhaust, many of these constituents have the potential to be introduced into the water. Of the compounds shown in Table 2, benzene, toluene, acrolein, naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, benzo(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene, indeno(1,2,3-cd)pyrene, dibenzo(a,h)anthracene, and benzo(g,h,i)perylene are priority pollutants. This discharge is not expected to contain bioaccumulators.

### Submarine Emergency Diesel Engine Wet Exhaust 4 3.4 Concentrations
Using submarine diesel engine power output specifications, the concentrations of the chemical constituents in the engine exhaust were estimated for each submarine class. By making the assumption that all constituents in the discharge liquid resulted from exhaust gases dissolving in the cooling water under equilibrium conditions, it is possible to estimate the concentration of constituents in the liquid using Henry’s Law. Henry’s Law describes the solubility of gases in a liquid and relates the concentration of a constituent in a liquid to the partial pressure of the constituent in the gaseous phase surrounding the liquid. The calculation sheet at the end of this report presents the assumptions made for this approach and provides a sample calculation for the concentration of benzene in the wet exhaust of a SSN 688 class submarine. Estimated concentrations are presented in Table 3.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
Mass loadings were calculated for constituents that exceed WQC using annual flow volumes (Table 1) and estimated constituent concentrations (Table 3). Annual flow volumes were calculated using the cooling water injection rate (Table 1) and an average operational time of 60 hours annually within 12 n.m. of shore, per submarine. 1 

### Fleet-wide mass loadings for individual chemical constituents were calculated through the following equation and are shown in Table 4.

Annual Mass Loading (kg) = (Concentration in Discharge (mg/L))(Annual Discharge (gal))(3.785 L/gal)(10 -6 

### kg/mg)

The mass loading calculations are an overestimate. Calculations using Henry’s Law assumed that equilibrium conditions exist. However, due to the low residence time (<1 second) of both exhaust products and water in the wet exhaust system, equilibrium conditions are unlikely. 7 

### Therefore, constituent concentrations are expected to be lower than calculated.

4.2 Environmental C oncentrations
A comparison of estimated constituent concentrations to corresponding Federal and most stringent state water quality criteria (WQC) is presented in Table 5. The estimated concentrations of phenanthrene, benzo(a)anthracene, chrysene, indeno(1,2,3-cd)pyrene, dibenzo(ah)anthracene, and benzo(g,h,i)perylene individually exceed the most stringent state

### Submarine Emergency Diesel Engine Wet Exhaust 5 (Florida) WQC. Concentrations have been based on a water temperature of 60 o 

### F. Since the majority of submarines are located in warm water ports, it is believed that 60 o 

### F is a reasonable assumption for an average water temperature. Concentrations may increase at colder temperatures because of increased constituent solubilities. However, even if concentrations triple, none of the individual constituents will exceed federal water quality criteria and only one additional individual compound (benzo(a)pyrene) will exceed Florida criteria for total PAHs. All other constituent concentrations are below relevant WQC.

4.3 Potential for Introducing Non-Ind igenous Species
Because water intake and discharge occur at the same location, there is no significant threat of non-indigenous species introduction to receiving waters.

5.0 CONCLUSION
This analysis concluded that submarine emergency diesel engine wet exhaust has a low potential for adverse environmental effect. Although total PAHs (the total of the following individual PAH compounds: acenaphthylene, benzo-(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(g,h,i)perylene, benzo(k)fluoranthene, chrysene, dibenzo(a,h)anthracene, indeno(1,2,3-cd)pyrene, and phenanthrene) exceeded water quality criteria for the most stringent state (Florida), the annual Fleet-wide mass loading was only 0.056 pounds from 86 vessels.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Table 6 shows the sources of data used to develop this NOD report.
Specific References

1. UNDS Data Call Package Submission from COMSUBLANT, 688 & 726 Class Submarine. December 13, 1996.

2. Gerry Viers, Newport News Shipbuilding. Submarine Diesel Exhaust System, 5 February 1997, Doug Hamm, Malcolm Pirnie, Inc.

3. Perry Buckberg, NAVSEA 03X33. Submarine Diesel Exhaust Temperatures, 13 November 1997, Russ Hrabe, M. Rosenblatt & Son, Inc.

4. UNDS Equipment Expert Meeting - Submarine Emergency Diesel Engine Exhaust. 3 September 1996.

### Submarine Emergency Diesel Engine Wet Exhaust 6 5. Faukner, M.G.; E.B. Dismukes; and J.R. McDonald. Assessment of Diesel Particulate Control: Filters, Scrubbers, and Precipitators . U.S. Environmental Protection Agency. EPA-600/7-79-232a. October, 1979.

6. United States Environmental Protection Agency Office of Air Quality Planning and Standards. Compilation of Air Pollution Emission Factors . AP-42, Fifth Addition, November, 1996.

7. Doug Hamm (MPI). Interoffice Memo: Estimation of Residence Time. March 4, 1998.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.

### Submarine Emergency Diesel Engine Wet Exhaust 7 Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

### Submarine Emergency Diesel Engine Wet Exhaust 8 Figure 1. Typical Submarine Diesel Exhaust System

### Submarine Emergency Diesel Engine Wet Exhaust 9 Figure 2. Typical Submarine Diesel Seawater System

### Submarine Emergency Diesel Engine Wet Exhaust 10 Table 1. Emergency Diesel Engine Applicable Vessels, Air Exhaust and Cooling Water Flow Rates, and Estimated Annual Discharge

Submarine Class No. of Submarines Air Exhaust

Flow Rate (cubic feet per minute) Cooling Water

Injection Rate (gallons per minute) Annual

Discharge per Submarine (gallons)* Annual

Discharge for Class (million gallons) SSN 688 (Los Angeles Class) 56 6500 11.5 41,400 2.3 SSBN 726 (Ohio Class) 17 8600 15.0 54,000 0.92 SSN 637 (Sturgeon Class) 13 3600 7.0 25,200 0.33 Total 86 N/A N/A N/A 3.55 * Based on 60-hour operating time annually per submarine



### Table 2. Emission Factors for Large Uncontrolled Stationary Diesel Engines 6



### Constituent Emission Factor (lb/MMBtu) a (ng/J) b
Benzene 7.76E-04 0.3337 Toluene 2.81E-04 0.1208 Xylenes 1.93E-04 0.0830 Formaldehyde 7.89E-05 0.0339 Acetaldehyde 2.52E-05 0.0108 Acrolein 7.88E-06 0.0034 NO x 3.2 1376 CO 0.85 365.5 CO 2 165 70950 Naphthalene 1.30E-04 0.0559 Acenaphthylene 9.23E-06 0.0040 Acenaphthene 4.68E-06 0.0020 Fluorene 1.28E-05 0.0055 Phenanthrene 4.08E-05 0.0175 Anthracene 1.23E-06 0.0005 Fluoranthene 4.03E-06 0.0017 Pyrene 3.71E-06 0.0016 Benzo(a)anthracene 6.22E-07 0.0003 Chrysene 1.53E-06 0.0007 Benzo(b)fluoranthene 1.11E-06 0.0005 Benzo(k)fluoranthene 2.18E-07 0.0001 Benzo(a)pyrene 2.57E-07 0.0001 Indeno(1,2,3-cd) pyrene 4.14E-07 0.0002 Dibenz(a,h) anthracene 3.46E-07 0.0001 Benzo(g,h,i) perylene 5.56E-07 0.0002

a Gaseous emission factors expressed in pounds per million British thermal unit (lb/MMBtu) b To convert from lb/MMBtu to ng/J, multiply by 430

### Submarine Emergency Diesel Engine Wet Exhaust 11 Table 3. Estimated Concentrations of Exhaust Constituents in Wet Diesel Exhaust (mg/L)

Submarine Class: Engine Power/Exhaust Rate: SSN688, LA Class (800kW, 6500 cfm) SSBN 726, Ohio Class (1000kW, 8600 cfm) SSN 637, Sturgeon (460kW, 3600 cfm) Exhaust Constituents Benzene .000018 .000017 .000019 Toluene .000005 .000005 .000006 Xylenes .000004 .000004 .000004 Formaldehyde .005749 .005431 .005969 Acetaldehyde .00018 .00017 .000187 Acrolein .000006 .000006 .000006 NOx .013364 .008234 .009049 CO .001814 .001714 .001884 CO 2 9.028866 8.530179 9.373719 Naphthalene .000038 .000036 .00004 Acenaphthylene .0000004 .0000004 .0000005 Acenaphthene .000002 .000002 .000003 Fluorene .000019 .000018 .00002 Phenanthrene .000129 .000122 .000134 Anthracene .000003 .000002 .000003 Fluoranthene .0000002 .0000002 .0000002 Pyrene .000039 .000037 .000041 Benzo(a)anthracene .000039 .000036 .00004 Chrysene .000105 .000099 .000109 Benzo(b)fluoranthene .000007 .000006 .000007 Benzo(k)fluoranthene .0000004 .0000004 .0000004 Benzo(a)pyrene .000012 .000011 .000012 Indeno(1,2,3-cd) pyrene .000434 .00041 .00045 Dibenz(a,h) anthracene .000339 .00032 .000352 Benzo(g,h,i) perylene .000751 .00071 .00078 Note: Concentrations have been based on a water temperature of 60 0 F. Bold indicates that water quality criteria is exceeded (see Table 5).

### Submarine Emergency Diesel Engine Wet Exhaust 12 Table 4. Fleet-Wide Estimated Annual Mass Loadings of Wet Diesel Exhaust Constituents Within 12 n.m. of Shore

Submarine Class: SSN688 Class SSBN 726 Class SSN 637 Class Engine Power: 800 kW 1000 kW 460 kW TOTAL Exhaust Rate: 6500 cfm 8600 cfm 3600 cfm FLEET WIDE No. Vessels: 56 Vessels 17 Vessels 13 Vessels Constituent (kg) (kg) (kg) (kg) (lbs) Polycyclic Aromatic Hydrocarbons (PAHs) Naphthalene 0.00033 0.00013 0.00005 0.00051 0.00112 Acenaphthylene 0.000004 0.000001 0.000001 0.000006 0.00001 Acenaphthene 0.00002 0.00001 0.000003 0.00003 0.00007 Fluorene 0.00017 0.00006 0.00002 0.00025 0.00056 Phenanthrene 0.00112 0.00042 0.00017 0.00171 0.00378 Anthracene 0.00002 0.00001 0.00000 0.00003 0.00008 Fluoranthene 0.000002 0.0000008 0.0000003 0.000003 0.00001 Pyrene 0.00034 0.00013 0.00005 0.00052 0.00115 Benzo(a)anthracene 0.00034 0.00013 0.00005 0.00051 0.00113 Chrysene 0.00091 0.00035 0.00014 0.0014 0.00308 Benzo(b)fluoranthene 0.00006 0.00002 0.00001 0.00009 0.0002 Benzo(k)fluoranthene 0.000003 0.000001 0.0000005 0.00001 0.00001 Benzo(a)pyrene 0.00010 0.00004 0.00002 0.00016 0.00035 Indeno(1,2,3-cd) pyrene 0.00377 0.00143 0.00057 0.00577 0.01272 Dibenz(a,h) anthracene 0.00295 0.00112 0.00044 0.00451 0.00995 Benzo(g,h,i) perylene 0.00654 0.00247 0.00098 0.01 0.02204

Note: Bold indicates that water quality criteria is exceeded (see Table 5).

### Submarine Emergency Diesel Engine Wet Exhaust 13 Table 5. Comparison of Discharge Concentrations and Water Quality Criteria ( μ g/L)

Constituent Estimated Discharge Concentration 1 Federal Acute WQC Most Stringent State

Acute WQC Polyaromatic Hydrocarbons (PAHs) Acenaphthylene 0.0005 None 0.031 (FL) 2 Phenanthrene 0.134 None 0.031 (FL) 2 Benzo(a)anthracene 0.04 None 0.031 (FL) 2 Chrysene 0.109 None 0.031 (FL) 2 Benzo(b)fluoranthene 0.007 None 0.031 (FL) 2 Benzo(k)fluoranthene 0.0004 None 0.031 (FL) 2 Benzo(a)pyrene 0.012 None 0.031 (FL) 2 Indeno(1,2,3-cd) pyrene 0.45 None 0.031 (FL) 2 Dibenzo (a,h) anthracene 0.352 None 0.031 (FL) 2 Benzo(g,h,i) perylene 0.78 None 0.031 (FL) 2 Total PAHs 2 1.89 0.031 (FL) 2
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) Where historical data were not reported as dissolved or total, the metals concentrations were compared to the most stringent (dissolved or total) state water quality criteria.

Bold number indicates that water quality criteria is exceeded. HI = Hawaii FL = Florida

1: Highest concentration of three submarine classes 2: Florida criteria for total PAHs is for the tot al of the following individual PAH compounds: acenaphthylene, benzo-(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(g,h,i)perylene, benzo(k)fluoranthene, chrysene, dibenzo(a,h)anthracene, indeno(1,2,3-cd)pyrene, and phenanthrene. Estimated discharge concentrations for total PAHs represent a sum of these chemicals.



### Table 6. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X 2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X 3.3 Constituents X X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X X

### Submarine Emergency Diesel Engine Wet Exhaust 14 Calculation Sheet Benzene

Background:
Henry’s Law was used to estimate the concentration of components in wet exhaust from submarine emergency diesel engines. This calculation sheet shows the calculation for the concentration of benzene in the wet exhaust of SSN 688 Class submarines. Calculations for the other exhaust components were similar.
An energy balance was used to determine the approximate wet exhaust equilibrium temperature. The resulting temperature was determined using an air exhaust flow rate of 6,500 cfm at 200 ° F, and a water injection rate of 11.5 gpm at 60 ° F. For this calculation, we assume the exhaust gas to have similar thermal properties to air.

Δ H: Change in enthalpy, m: mass of air or water, Cp: Specific heat capacity of air or water

Δ H exhaust gas = Δ H water Δ H exhaust gas = mCp (200 ° F-T)

= (6,500 ft 3 /min.) (0.0601 lb m /ft 3 ) (0.24 Btu/lb m ° F) (200 ° F - T)

= 93.76 Btu/ ° F-min. ( 200 ° F-T) (1)

Δ H water = mCp (T-60 ° F) = (11.5 gal/min.) (8.345 lb m /gal) (1 Btu/ lb m ° F) (T-60 ° F)
= 95.97 Btu/ ° F-min. (T-60 ° F) (2)

Setting (1) = (2) we obtain the following:
93.76 Btu/ ° F-min. (200 ° F -T) = 95.97 Btu/ ° F-min. ( T-60 ° F) 93.76 (T) + 95.97 (T) = 200 ° F (93.76) + 95.97 (60 ° F)

T = 129.18 ° F = (9/5) ° C + 32 = 54 ° C
This temperature was then used to determine the appropriate values for Henry’s Law constants, which vary with temperature.

At dilute concentrations, the concentration of benzene dissolved in water can be found from Henry’s Law: X a, exhaust = (H a ) (X a, water ) / (P t ) Where: X a, exhaust : Mole Fraction of Benzene in Exhaust H a : Henry’s Law Constant (atm) X a, water : Mole Fraction of Benzene in Water P t : Total Exhaust Pressure (atm)
Rearranging, Henry’s Law can be rewritten as:

X a, water = (X a, exhaust ) (P t ) / H a The mole fraction of benzene in exhaust can then be converted into a concentration of benzene in the wet exhaust in mg/L using the molecular weight of benzene.
Given Conditions and Assumptions: 55.56 moles H 2 O in 1 liter [ (mole H 2 O / 18 g H 2 O) (1000g / Liter H 2 O) = 55.56 moles H 2 O/L ] Exhaust temperature of 200 ° F (Reference 3)

### Submarine Emergency Diesel Engine Wet Exhaust 15 6,500 cfm air exhaust flow rate for 800 kW diesel engine 0.334 ng/J generation rate of benzene Backpressure on engine i s approximately 70% above atmospheric when surfaced (P t = 1.70 atm) Molecular weight of benzene is 78.11 grams per mole (78,110 mg/mole) Based on a water temperature of 54 ° C (327.15 K), Henry’s Law constants (in atm) for the constituents are the following:

Constituent H a (atm)

Benzene 7.30 E+03 Toluene 8.89E+03 Xylenes 8.56E+03 Formaldehyde 2.30E+00 Acetaldehyde 2.34E+01 Acrolein 2.22E+02 No x 4.01E+04 CO 7.85E+04 CO 2 3.06E+03 Naphthalene 5.71E+02 Acenaphthylene 3.45E+03 Acenaphthene 3.19E+02 Fluorene 1.13E+02 Phenanthrene 5.31E+01 Anthracene 7.96E+01 Fluoranthene 2.92E+03 Pyrene 1.59E+01 Benzo(a)anthracene 2.70E+00 Chrysene 2.44E+00 Benzo(b)fluoranthene 2.77E+01 Benzo(k)fluoranthene 9.17E+01 Benzo(a)pyrene 3.61E+00 Indeno(1,2,3-cd) pyrene 1.60E-01 Dibenz(a,h) anthracene 1.71E-01 Benzo(g,h,i) perylene 1.24E-01
The conversion of Henry’s Law constants into common units is presented at the end of the calculation sheet.

Solution: 1) Total number of moles per cubic foot in the air exhaust, including constituents and circulated air, n t The number of moles per cubic foot can be determined using the ideal gas law; PV = n t RT

Where: P: Pressure within the exhaust piping, 1.7 atm V: Volume of space occupied by gas (assume 1 ft 3 ) R: Gas constant, 0.08206 L-atm/ K-mol T: Temperature, 327.15 K
Rearranging the ideal gas law equation and solving for n t /V yields:

n t /V = P/RT

n t /V = (1.7atm) (28.32 L/ ft 3 ) / (( 0.08206 L-atm/ K-mol) (327.15 K)) = 1.79 moles/ ft 3

2) Concentration of benzene in air exhaust, A b

### Submarine Emergency Diesel Engine Wet Exhaust 16 A b = (0.334 ng/J) (800 kW) (3.6 x 10 6 J/kW-Hr) (10 -9 g/ng) (1000 mg/g) (min./6500 f t3 ) (Hr/60 min.)
A b = 2.47 x 10 -3 mg/ft 3 = (2.47 x 10 -3 mg/ft 3 ) ( g/1000 mg) ( mole benzene / 78.11 g)

= 3.17 x 10 -8 moles benzene/ft 3 exhaust

3) Mole fraction of gas in exhaust, X a, exhaust

X a, exhaust = A b /total molar concentration

X a, exhaust = (3.17 x 10 -8 moles benzene/ ft 3 exhaust) / (1.79 total moles/ ft 3 exhaust)

X a, exhaust = 1.77 x 10 -8 moles benzene/ mole exhaust

4) Mole fraction of gas in water, X a, water

X a, water = (X a, exhaust ) (P t ) / H a X a, water = (1.77 x 10 -8 ) (1.70 atm) / 7300 (atm)

X a, water = 4.12 x 10 -12 moles benzene / mole water

5) Concentration of gas in water:

Per 1 liter of water;

Moles benzene = (4.12 x 10 -12 moles benzene / mole H 2 O) (55.56 moles H 2 O/ 1 liter) = 2.29 x 10 -10 moles/L

(2.29 x 10 -10 moles/L ) (78.11 g benzene/mole) = 1.8 x 10 -8 g/L benzene (1.8 x 10 -8 g/L) (1000 mg/g) = 1.8 x 10 -5 mg/L benzene

### Submarine Emergency Diesel Engine Wet Exhaust 17 Determination of Henry’s Constants Henry’s constants for the constituents of concern were available, but units and temperature for the constants varied between the references used. Henry’s constants with the following units were available:

1) H 1 , atm 2) H 2 , atm-m 3 /mol
For purposes of clarity, the same calculation was used for each constituent of concern. It was therefore necessary to convert all of Henry’s constants to atm units, (1).

1) Conversion from H 2 (atm-m 3 /mol) to H 1 (atm):

H 1 = (H 2 in atm-m 3 /mol) (55.6 mol water / L) (L / 10 -3 m 3 water) = H 2 * (55,600)

Henry’s constants with the following temperatures in degrees Celsius were available:

(1) 20 o C (2) 24 o C (3) 25 o C (4) 40 o C
Henry’s constants increase on average about threefold for every 10 o C rise in temperature for most volatile hydrocarbons. a Therefore, the constants will increase by a factor of Δ H = 3 ( Δ T/10) . All of the constants were converted to 54 o C constants using the following conversions
For Henry’s constant at 54 o C, and converting from Henry’s constants at 20 o C, 24 o C, and 25 o C respectively:

H 54 = (H 20 ) (41.9)

H 54 = (H 24 ) (27)

H 54 = (H 25 ) (24.2)

H 54 = (H 40 ) (4.66)

Example - Henry’s Constant Calculation
For Acrolein, Henry’s constant was available in atm-m 3 /mol for 20 o C (H a = 9.54 x 10 -5 ) Therefore, at 54 ° C, Henry’s constant will be: H a (atm) = (9.54 x 10 -5 atm-m 3 /mol) (55,600 mol/m 3 ) (41.9) H a = 222 atm
Using this approach, the constants were converted to atm units as shown in the table on the following page.

### Submarine Emergency Diesel Engine Wet Exhaust 18 Table of Henry’s Constants

Temperature 54 o C 20 o C 25 o C 40 o C H a for 54 o C Source Cooper b USEPA c Mackay d CH2M Hill e Units (atm) (atm-m 3 /mol) (atm-m 3 /mol) (atm-m 3 /mol) (atm) Benzene 5.43E-03 7.30 E+03 Toluene 6.61E-03 8.89E+03 Xylenes 6.37E-03 8.56E+03 Formaldehyde 9.87E-07 2.30E+00 Acetaldehyde 9.05E-05 2.34E+01 Acrolein 9.54E-05 2.22E+02 NO x 4.01E+04 4.01E+04 CO 7.85E+04 7.85E+04 CO 2 3.06E+03 3.06E+03 Naphthalene 4.24E-04 5.71E+02 Acenaphthylene 1.48E-03 3.45E+03 Acenaphthene 2.37E-04 3.19E+02 Fluorene 8.39E-05 1.13E+02 Phenanthrene 3.95E-05 5.31E+01 Anthracene 5.92E-05 7.96E+01 Fluoranthene 2.17E-03 2.92E+03 Pyrene 1.18E-05 1.59E+01 Benzo(a)anthracene 1.16E-06 2.70E+00 Chrysene 1.05E-06 2.44E+00 Benzo(b)fluoranthene 1.19E-05 2.77E+01 Benzo(k)fluoranthene 3.94E-05 9.17E+01 Benzo(a)pyrene 1.55E-06 3.61E+00 Indeno(1,2,3-cd) pyrene 6.86E-08 1.60E-01 Dibenz(a,h) anthracene 7.33E-08 1.71E-01 Benzo(g,h,i) perylene 5.34E-08 1.24E-01 Bold: Original Referenced Number

a. Kavanaugh, Michael C. and R. Rhodes Trussell, Design of Aeration Towers to Strip Volatile Contaminants from Drinking Water. American Water Works Association, December, 1980.
b. Cooper, David and F. Alley, Air Pollution Control, A Design Approach. Waveland Press, Inc., 1986.
c. United States Environmental Protection Agency Office of Air Quality Planning and Standards. Ground-Water and Leachate Treatment Systems Manual. R-94, January 1995.
d. Mackay, Donald and Wan Ying Shiu, A Critical Review of Henry’s Law Constants for Chemicals of Environmental Interest. University of Toronto, Canada, 1981.
e. CH2M Hill. Bay Area Sewage Toxic Emissions Model. Version 3, 1992.

### Submarine Outboard Equipment Grease and External Hydraulics 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS are being developed in three phases. The first phase (which this report supports) will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs) -- either equipment or management practice. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References.

Submarine Outboard Equipment Grease and External Hydraulics

### Submarine Outboard Equipment Grease and External Hydraulics 2 2.0 DISCHARGE DESCRIPTION
This section describes the submarine outboard equipment grease and external hydraulics discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
This discharge occurs when grease applied to a submarine’s outboard equipment i s released to the environment by erosion from the mechanical action of the seawater while the submarine is underway and, to a much lesser extent, by slow dissolution of the grease into seawater. The discharge also includes any hydraulic oil that could leak past the seals of the hydraulically operated external components of a submarine.

2.1.1 Grease from Outboard Equipment
Submarine outboard equipment that requires lubrication includes steering and diving control mechanisms and control surface bearings. Grease is applied quarterly while a submarine is in port. 1 

### Figure 1 shows the various grease points on a submarine that can come into contact with seawater under partially or completely submerged conditions. Of these, the ones that are operated within 12 nautical miles (n.m.) and could release grease to the environment are the retractable bow planes, and the fairwater (sail planes). The retractable bow plane components require the largest amount of grease for operation. Figure 2 is a cut-away diagram of the retractable bow plane cavity where grease is applied to its various components.

Bow Plane Mechanisms. The retractable bow planes are a set of fins or control surfaces that are housed within the envelope of the hull and are extended to provide depth control while the submarine is moving underwater. These bow planes have mechanisms that slide in and out causing the bow planes to change position in response to commands from the helm. The sliding components are lubricated by an automatic system that applies grease every time they move back and forth. This movement may cause some grease to loosen and detach from the components and deposit in the bow plane compartment (20 feet wide by 6 feet long by 5 feet high) which is in contact with the sea through a narrow, half-inch-wide gap around each bow plane. Because of this relatively narrow opening to the sea as well as a protective brush that covers this gap completely around the retractable bow plane, the probability of loose grease in the cavity washing out of the compartment is low. Currently, only 22 submarines have retractable bow plane compartments, but future design trends will increase this number. 2



### Fairwater Plane Mechanisms. Submarines that do not have retractable bow planes have control surfaces that perform a similar function, but which are located on the sail structure. These are the fairwater planes. Currently, there about 72 submarines in the fleet with fairwater planes. Fairwater planes have components similar to the retractable bow planes that also lubricated by greasing, but the components do not contact seawater while the submarine is within

### Submarine Outboard Equipment Grease and External Hydraulics 3 12 n.m. because the fairwater planes are located well above the water line when the submarine is surfaced.

2.1.2 External Hydraulics
The external hydraulic system on a submarine supplies hydraulic fluid under pressure to operate the following equipment:

• masts (e.g. radio antennas, radar, electronic counter measures, etc.), periscopes, and their associated fairings (e.g., hydrodynamic covers for the various masts and periscopes needed to reduce the turbulence while the submarine is running submerged with the masts and/or periscopes raised);

• retractable bow plane actuator mechanisms; and

• secondary propulsion motor hoist cylinders located outside the pressure hull.
Figure 3 shows the location of masts, antennas, and periscopes on a submarine’s hull. The secondary propulsion motor hoist cylinders (not shown in the figure) are located in an aft ballast tank.
Navy submarines use specially formulated oil in their external hydraulic systems. The hydraulic oil is normally pressurized to approximately 1,400 pounds per square inch (psi) and stored in a reservoir that holds approximately 200 gallons. The total amount of hydraulic oil in the system, including that in piping and the reservoir, is approximately 250 gallons. On submarines that have hydraulically-operated retractable bow planes (22 of 94 submarines), the total amount of hydraulic oil is approximately 400 gallons. 3 

### Of those items identified above operated by the external hydraulic system, only the retractable bow plane actuator mechanisms will have any possible release to the environment. In the case of the masts, antennas, and periscopes, they are located well above the waterline, well away from any contact with the seawater, where there is no possible erosion of the any oil film generated by the equipments’ operation. In the case of the secondary propulsion motor, it is only operated in rare emergency situations, and as such is not covered by the UNDS criteria.

2.2 Releases to the Environment
Grease transport is produced through the mechanical action of the water against components covered with grease. Underway, some of the loose grease in the bow plane compartment can be eroded by the mechanical action of the flowing seawater. The amount of grease released is directly proportional to the force of turbulent water in the vicinity of the grease resulting in erosion, which, in turn, is directly proportional to submarine speed. Within 12 n.m., a submarine’s speed is low by comparison to its speed when submerged. It increases speed once it submerges. Therefore, the amount of mechanical erosion within the 12 n.m. zone is less than when the submarine is in open ocean.

### Submarine Outboard Equipment Grease and External Hydraulics 4 Very little, if any, grease is discharged when a submarine is pierside because the outboard equipment is not being actuated, and the erosive action of seawater is minimal when the submarine is stationary.
Periodically, when the submarine is dry docked (typically every two years), grease that has accumulated in the retractable bow plane compartment is removed and disposed of in an approved manner by a qualified shore facility. 1



### Under normal operating conditions, little hydraulic oil is released within 12 n.m. of shore. Within this zone, the snorkel masts and the antennas are above the water line and do not contact seawater (except for an occasional sea spray). Hydraulic oil may be released when the external hydraulic systems are tested during outbound transits. Leaked oil, if any, is likely to be small quantities that adhere to the component surface. Only when the submarine submerges (beyond 12 n.m.) will the oil be washed away. Oil releases from bow planes generally remain in the upper area of the cavities surrounding the planes. Because of the small size, configuration, location of the bow plane cavity opening, and minimal seawater turbulence, transport of trapped oil to the sea is unlikely. Further, only 22 of the 94 submarines in service have hydraulically operated bow planes. The secondary propulsion motor is available as a backup option to maneuver close to port when needed. Typically, tugs are available for this purpose and the secondary propulsion motor is not used under normal operating circumstances.

2.3 Vessels Producing the Discharge
All submarines have lubricated outboard equipment and external hydraulic systems. Because all submarines belong to the Navy, this discharge is not produced by vessels belonging to the Army, Air Force, U.S. Coast Guard, and the Military Sealift Command.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas; Section 3.2 describes the rate of the discharge; Section 3.3 lists the constituents in the discharge; and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Outboard equipment grease can be discharged wi thin 12 n.m. of shore. The amount is dependent on how much contact there is between the seawater and the greased components, and how fast the vessel is traveling. Most hydraulically operated outboard equipment does not contact seawater within 12 n.m. of shore because submarines usually run surfaced in this zone and the outboard equipment is mostly above the waterline. Submarine dive points are outside the 12 n.m. zone except for those dive points off the coast of the Hawaiian islands and Washington state. 4,5

### Submarine Outboard Equipment Grease and External Hydraulics 5 3.2 Rate
This discharge is the washout of oil and grease when lubricated components and components with hydraulic oil come in contact with flowing seawater.

Grease. A rough estimate of grease discharge can be made based on the total amount used. Each attack submarine (SSN) uses approximately 425 pounds of grease annually, while each missile submarine (SSBN) uses an estimated 800 pounds annually. 2 

### Approximately 81% of the submarine fleet are SSNs and 19% are SSBNs. On a weighted average basis, therefore, each submarine uses approximately 496 pounds of grease each year.
The grease is released primarily by the mechanical action of the seawater against the greased submarine components and, therefore, happens only when the submarine is underway. Each submarine enters and leaves port approximately six times per year. 3,6 

### A typical one-way trip through the 12 n.m. zone lasts approximately 4 hours; therefore, the total annual transit time through that zone is 48 hours per submarine ((6) (4) (2) = 48). 6 

### A submarine typically spends 6 months, or 183 days, moving in the water so transit time accounts for less than 1.1% of this total time at sea. Therefore, 1.1% of the total grease used can be assumed to be released during transits. 3,4. 

### The resulting 1.1% of the 496 pounds of grease per vessel per year is equivalent to a discharge rate of approximately 5.5 pounds of grease for each vessel per year within 12 n.m.
Hydraulic Oil. Hydraulic oil is retained in the system by internal and external seals; the former prevents hydraulic oil from leaking into the submarine, while the latter prevents oil from leaking outside the hull. Because some leaks still occur, the Navy has established acceptable leak rates. 7 

### For newly installed seals, the specification allows “a slight wetting of the tailrod or other visible part of the sealing area.” In addition to the “slight wetting” qualitative criterion, the specification also provides a quantitative leak rate standard of one drop every 25 cycles for each inch (or fraction) of rod (length) or seal diameter. For example, a cylinder with a 2.25-inch diameter rotating tailrod would be allowed to leak at a rate of three drops every 25 cycles. A cycle is defined as moving from a fully retracted position to a fully extended position and back. 7



### The specification also contains seal replacement criteria. If leaks occur when a component is not operating, the seal should be replaced when the leak rate is four milliliters (mL) or more per hour for each inch (or fraction) of seal diameter. If leaks occur when a component is cycled, the seal should be replaced when a leak rate of one mL or more per inch of seal diameter (or fraction) for every 10 cycles is observed.

Leak rate standards can be used to estimate the amount of oil that leaks into the sea from external hydraulic systems seals. For example, the two bow planes, when deployed, are each 7.5 feet long. At a rate of one drop of oil every 25 cycles for each inch of rod length, the acceptable leak rate for the two diving planes, which are a combined 15 feet long, is 180 drops (15 feet = 180 inches) every 25 cycles. Assuming that 10 drops are equivalent to one mL, 2 

### 18 mL of oil will leak every 25 cycles. Therefore, each time the bow planes are extended and retracted (one cycle), approximately 0.72 mL (18 mL/ 25 cycles) of oil will be released but will likely remain in the bow plane cavity. Assuming six outbound transits per year for each vessel and that the vessel

### Submarine Outboard Equipment Grease and External Hydraulics 6 cycles its retractable bow planes twice during each transit, this would result in a discharge rate of 8.64 mL of oil discharged per vessel per year. This calculation assumes that external hydraulic systems are tested during outbound transits only.

3.3 Constituents
This discharge consists of Termalene #2 grease and hydraulic oil. Termalene #2 consists of mineral oil, a calcium-based rust inhibitor, an antioxidant, and dye. 8 

### Hydraulic oil consists of heavy paraffinic distillates and additives.
In general, greases are made from lubricating stocks generat ed during petroleum fractionation. These fractions contain organic compounds (C 17 

### or higher). Lubricating oils are composed of aliphatic, olefinic, naphthenic (cycloparaffinic), as well as aromatic hydrocarbons, depending on their specific use. Lubricating oil additives include antioxidants, bearing protectors, wear resisters, dispersants, detergents, viscosity index improvers, pourpoint depressors, and antifoaming and rust-resisting agents. 9 

### Lubricating oils and greases could have priority pollutants. No bioaccumulators are expected.

3.4 Concentrations
The discharge consists of 100% grease and oil in their pure form as they are washed away from the vessel’s surface due to mechanical action of water. Because the oil or grease do not become mixed with water until they contact the surrounding seawater, concentrations in the discharge cannot be defined in the conventional sense. It is known that the hydraulic oil consists of 95-99% heavy paraffinic distillates. 10 

### The remainder consists of additives.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are estimated and compared with the water quality criteria. In Section 4.3, the potential for transfer of non-indigenous species is discussed.

4.1 Mass Loading

4.1.1 Grease From Outboard Equipment
Using the assumption that 100% of the applied grease is washed away, the annual amount of grease discharged by each submarine within 12 n.m. is 1.1% of the total grease used (Section 3.2), or approximately 5.5 pounds per vessel per year. Based on 94 submarines, the total amount of grease discharged within 12 n.m. on an annual basis is 517 pounds.

4.1.2 External Hydraulics

### Submarine Outboard Equipment Grease and External Hydraulics 7 Based on a per vessel discharge rate of 1.44 mL per vessel per transit (six transits per vessel per year) or 8.64 mL per vessel per year and given that there are 22 submarines currently existing in the fleet that contribute to this discharge, the fleet wide mass loading is 190 mL per year. This is equivalent to 0.0029 pound (lb) per vessel per transit (at a density of 7.51 lb/gallon) or 0.3755 lb of oil released per year by the entire submarine fleet.

4.2 Environmental Concentrations
As a submarine moves, it creates a disturbance in the surrounding seawater. This disturbed volume of seawater may be thought of as a mixing zone in which discharges from the submarine would be dispersed. This volume of seawater was estimated and used in concentration calculations. A sample calculation for a SSN 688 Class submarine is presented below. The calculation was based on the following assumptions:

• SSN 688 Class submarine has a total width of 33 feet. 11



### • Width is the diameter of the vessel’s cross section.

• A mixing zone of 10 feet around the hull, based on the width of wake behind a typical SSN.

• The discharge is mixed uniformly throughout the mixing zone over the entire transit.

• The submarine is only partially submerged, at an approximate depth of 28 feet

The width of submarines ranges from 31.8 feet (SSN 637 Class) to 42.3 feet (SSN 21 Class). 11 

### Therefore, the range of volume of water swept, using similar calculations to those above, would be 118 million cubic feet to 158 million cubic feet per submarine per transit.

4.2.1 Grease from Outboard Equipment
To develop environmental concentration estimates for grease, it is assumed that the 5 pounds of grease discharged per year are evenly distributed over the 12 transits through the 12 n.m. zone. Therefore, for each transit, approximately 0.46 pound (5.5 pounds of grease per submarine per year divided by 12 transits per year) of grease is discharged. Based on the previous calculations, the smallest volume of water swept by a submarine is 118 million cubic feet by the SSN 637 Class. Therefore, the concentration in the environment was estimated as 1) Cross-sectional area = (area of submarine cross section and disturbed width) - (area of the chord representing that portion of the circle above the surface of the water) area = [(3.14) (33/2 + 10) 2 

### ] - [area of a chord of height 15 ft of a circle of radius 26.5 ft] area = 2,206 ft 2 

### - 514 ft 2 

### = 1692 ft 2



### 2) Volume of water swept = (area) (12 n.m. distance) volume = (1,692 ft 2 

### ) (72, 960 ft) = 1.23 x 10 8 

### ft 3 

### , or 123 million cubic feet

### Submarine Outboard Equipment Grease and External Hydraulics 8 presented below: (Note: The calculations were based on the area swept by the SSN 637 class hull as it represents the smallest swept area.)

0.46 pound of grease ÷ 1.18 x 10 8 

### ft 3 

### of water = 208.6 g of grease in 3.34 x 10 9 

### Liters of water

= 6.2 x 10 -8 

### g/L = 0.062 μ g/L

This estimated concentration was based on 100% of the grease being washed away. Most grease discharged remains in hull cavities and is removed from the submarine during maintenance. Although open to seawater, the 0.5-inch-wide gaps around retractable bow planes are well shielded by close-fitting brushes, and the seawater in the compartment or cavity is quiescent compared to water moving over the hull. Therefore, the rate of grease erosion will be lower than the amount calculated.

4.2.2 External Hydraulics
To estimate environmental concentrations for hydraulic oil, the following assumptions are made:
- Volume of water swept by the submarine is 118 million ft 3 

### or 3.34 x 10 9 

### liters per transit. - The discharge rate of hydraulic oil is 0.0029 lb per vessel per transit uniformly distributed throughout the transit.
Based on the above assumptions, the environmental concentration can be estimated as follows:

1) Oil released = 0.0029 lbs = 1.32 g of oil released per vessel per transit 2) Concentration = (g of oil released) ÷ (liters of water)

= (1.32 g) ÷ (3.34 x 10 9 

### L) = 3.95 x 10 -10 

### g/L = 3.95 x 10 -4 

### μ g/L

4.2.3 Total Releases
Based on the environmental concentrations estimated above, the total oil & grease concentration in the surrounding water would be the sum of individual concentrations, i.e., 0.062 μ g/L + 0.000395 μ g/L = 0.062395 μ g/L, or approximately 0.06 μ g/L. This concentration does not exceed federal discharge standards and state water quality criteria as shown in Table 1.

4.3 Potential for Introducing Non-Indigenous Species
Non-indigenous species are not introduced by this discharge because seawater is not taken aboard or discharged when this discharge is generated.

### Submarine Outboard Equipment Grease and External Hydraulics 9 5.0 CONCLUSIONS
The submarine outboard equipment grease and external hydraulics system discharge has a low potential to cause an adverse environmental effect. This is due to the small amounts of lubricant released when the vessel is underway is dispersed to concentrations below water quality criteria. The estimated concentrations of oil and grease in the environment that results from movement of submarines, is 0.06 ppb, which is far below Federal and most stringent state water quality criteria. These concentrations were estimated based on the volume of water (3.3 billion liters) swept by a submarine while in transit through the 12 n.m. zone, and the conservatively estimated amount of oil and grease released during transit (1.44 mL and 0.46 pounds, respectively).

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information and assumptions were used to estimate the rate of discharge. Based on this estimate and on the reported concentrations of oil and grease components, the concentrations of oil and grease in the environment resulting from this discharge were then estimated. Table 2 shows the sources of the data used to develop this NOD report.
Specific References

1. UNDS Equipment Expert Meeting, Submarine Outboard Equipment Grease. September 1, 1996.

2. UNDS Round 2 Equipment Expert Meeting Minutes, March 24, 1997.

3. Personal Communication between Commander, Submarine Forces, Atlantic Fleet, Staff Environmental Officer, LCDR L. McFarland and Bruce Miller, MR&S. April 28, 1997.

4. Commander, Submarine Forces, Atlantic Fleet, Staff Env ironmental Officer, LCDR L. McFarland. CINCLANTFLT meeting with SEA 00T/03L, May 13, 1997.

5. Personal Communication between Commander, Submarine Forces Pacific Fleet, Staff Environmental Officer, LCDR W. Jederberg and Bruce Miller, MR&S, Sept 11, 1997.

6. Pentagon Ship Movement Data for Years 1991-95, March 4, 1997.

7. Naval Ship's Technical Manual (NSTM), Chapter 556, Revision 2, Hydraulic Equipment Power Transmission and Control. pp 11-1 and 11-2. March 1, 1993.

8. Bel-Ray Company, Inc., Material Safety Data Sheet for Termalene #2, May 5, 1998.

### Submarine Outboard Equipment Grease and External Hydraulics 10 9. Patty’s Industrial Hygiene and Toxicology, Volume IIB, 3rd Revised Edition, 1981, pp 3369, 3397.

10. Material Safety Data Sheet, Imperial 2075 TH Petroleum Base Hydraulic Fluid, January 1998.

11. Jane's Information Group, Jane's Fighting Ships. Capt. Richard Sharpe, Ed. Sentinel House: Surrey, United Kingdom, 1996.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.

### Submarine Outboard Equipment Grease and External Hydraulics 11 Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. 23 March 1995.

### Submarine Outboard Equipment Grease and External Hydraulics 12 Table 1. Comparison of Environmental Concentration with Relevant Water Quality Criteria

Constituent Concentration Federal Discharge Standard Florida Acute Water Quality Criteria Oil & Grease 6 μ g/L visible sheen a 

### / 15,000 μ g/L b 

### 5,000 μ g/L Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995)

a Discharge of Oil , 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. b International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS)



### Table 2. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents X 3.4 Concentrations X X 4.1 Mass Loadings X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X X

### Submarine Outboard Equipment Grease and External Hydraulics 13 Figure 1. Submarine Points of Contact of Grease and Seawater

### Submarine Outboard Equipment Grease and External Hydraulics 14 Figure 2. Retractable Bow Plane Arrangement (Typical)

### Submarine Outboard Equipment Grease and External Hydraulics 15 Figure 3. Location of Masts, Antennas, and Periscopes

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the armed forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that have been identified as candidates for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the armed services with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contain sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 2 2.0 DISCHARGE DESCRIPTION
This section describes the bilgewater/OWS discharge and includes information on: the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation

2.1.1 The Bilge Area
The lowest inner part of the hull where liquid drains from the interior spaces and the upper decks of the vessel is referred to as the bilge. The primary sources of drainage into the bilge are the main engine room(s) and the auxiliary machinery room(s), which house the vessel’s propulsion system and auxiliary systems (i.e., steam boilers and water purification systems), respectively. Other spaces that collect and contain fluid drainage in their bilge are the shaft alley, steering gear rooms, pump rooms, and air conditioning and refrigeration machinery rooms. Some oil lab sink drains are also directed to the bilge. The liquid collected in the bilge is known as “bilgewater” or “oily wastewater”.

2.1.2 Composition of Bilgewater
The composition of bilgewater varies from vessel to vessel; the composition of bilgewater also varies from day to day on the same vessel. Certain wastestreams, including steam condensate, boiler blowdown, drinking fountain water, and sink drainage located in various machinery spaces, can drain to the bilge. The propulsion system and auxiliary systems use fuels, lubricants, hydraulic fluid, antifreeze, solvents, and cleaning chemicals, as part of routine operation and maintenance. Small quantities of these materials enter the bilge as leaks and spills in the engineering spaces. On some older vessels, excess potable water produced by onboard water purification systems is directed to the bilge, although this practice is being phased out. 1 

### On some Navy and Coast Guard vessels, water from gas turbine washdowns can contribute to bilgewater generation; these washdowns are described in the Gas Turbine Water Wash NOD report.

2.1.3 Bilgewater Treatment and Transfer System
Every surface vessel has an onboard system for collecting and transferring bilgewater. Vessels pump collected bilgewater to a holding tank which the Navy refers to as the oily waste holding tank (OWHT). Some vessels are capable of transferring bilgewater from the OWHT to shore facilities while pierside. OWS systems are installed on vessels, as appropriate, to reduce the oil content of bilgewater prior to overboard discharge. These systems receive bilgewater from the OWHT and use gravity-phase separation, coalescence, centrifugal separation, or combinations of these technologies to treat the waste.
A commonly used Navy OWS is a coalescing plate gravity separator. This type of separator has a horizontal set of oleophilic plates. Oil droplets rise and coalesce as they flow

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 3 through the plates. The droplets cling to and wet the oleophilic plates once they rise to a plate’s underside. When sufficient oil has accumulated, large oil droplets rise through weep holes in the plates and flow to the top of the OWS. The separated oil is then transferred to a waste oil tank (WOT). Figure 1 is a process flow diagram of the standard OWS system used on most Navy vessels.
On some vessels, oil content monitors (OCMs) are installed to prevent the discharge of unacceptable effluent. If the oil content is above the set point limit, the OCM alarms and diverts the OWS effluent back to the OWHT for reprocessing until an acceptable oil concentration reading is obtained.
In addition to the oil removed by the OWS, waste oil from routine maintenance is also collected in the WOT and held for pierside disposal.
Synthetic lubricant oils (SLOs) are not collected in the WOT, and measures are taken to prevent their introduction into the bilge. SLOs have a specific gravity close to that of water and cannot be separated in the OWS. These oils are normally found in engine spaces and are collected in drip pans located underneath the engines. The drip pans drain through segregated piping to dedicated collection tanks. SLOs within these tanks are disposed of on-shore separately from non-synthetic waste oils. Therefore, SLOs, except for tank overflows, are not likely to be in bilgewater at significant levels.
Some ships (e.g., DDG 51 Class destroyers) use non-oily machinery wastewater collection systems that segregate oily wastewater from non-oily wastewater. These ships collect non-oily machinery wastewater in dedicated collection tanks instead of the bilge, and discharge it directly overboard. All oily wastewater collects in OWHTs and is processed by a shipboard OWS or off-loaded for shore facility treatment.

2.2 Releases to the Environment
Untreated bilgewater is expected to contain oil and grease (O&G), an assortment of oxygen-demanding substances, and organic and inorganic materials. These materials include volatile organic compounds (VOCs), semi-volatile organic, inorganic salts, and metals. O WS effluent releases to the environment contain the same constituents present in bilgewater but with lower concentrations of O&G and oil-soluble components.

2.3 Vessels Producing the Discharge
All vessels produce bilgewater. OWS systems have been installed on most vessels of the Armed Forces. Some small boats and craft are not outfitted with OWS systems; thus, bilgewater is stored for shore disposal. Table 1 lists all surface vessels equipped with OWSs. Submarine bilgewater is addressed in the Submarine Bilgewater NOD report.

3.0 DISCHA RGE CHARACTERISTICS

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 4 This section contains qualitative and quantitative information which characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
The Armed Forces do not discharge untreated bilgewater to surface waters. On ships without OWS systems, untreated bilgewater is held for transfer to a shore treatment facility. Bilgewater treated by an OWS can be discharged within or beyond 12 nautical miles (n.m.). On Navy vessels with an OWS and OCM, oil concentrations must be less than 15 parts per million (ppm) prior to discharge. However aboard Navy vessels, discharge of bilgewater with an oil concentration less than 100 ppm is allowed outside 12 n.m. if concentrations less than 15 ppm cannot be achieved because of operating conditions.

3.2 Rate
Bilgewater generation rates vary by vessel and vessel class because of the differences in vessel age, shipboard equipment (e.g., type of propulsion system), operations, and procedures. Vessels with non-oily machinery wastewater collection systems will generate significantly less bilgewater because of their capability to keep non-oily waste streams out of the bilges. The DDG 51 and CVN 68 class ships are two examples of ship classes that have non-oily machinery wastewater collection systems. Other factors influencing bilgewater generation rates are whether a vessel is operating in-port or at-sea, and when in port, whether it is operating in an auxiliary steaming mode or receiving shore electrical/steam power (cold iron mode). In the auxiliary steaming mode, a vessel provides its own services while moored at the pier (i.e., power, freshwater, etc.). In the cold iron mode, a vessel receives these services from shore facilities, minimizing the amount of shipboard equipment in operation. Older vessels without non-oily machinery wastewater collection systems have historically generated more bilgewater while operating in the auxiliary steaming mode than in the cold iron mode because of the discharge of utilities wastewater to the bilge.
Table 2 shows the in-port bilgewater generation rates for certain destroyers (DD 963 and DDG 51 Classes) and aircraft carriers (CVN 68 Class). For the destroyers, bilgewater generation rates were developed by monitoring the levels of bilgewater in the bilges. 1,2 

### Aircraft carrier class (CVN 68) data was gathered from an analysis of a carrier’s (CVN 74) OWS operator log sheets in order to determine the amount of bilgewater that had passed through the OWS over an extended period of time, thus providing an estimate of the bilgewater generation rate. 3



### Table 3 summarizes the bilgewater/OWS flow rates that were developed for an aircraft carrier class (CVN 68), “other ship classes,” and the overall fleet based on the average values from Table 2. The assumptions that were made in developing the estimates are summarized as follows:

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 5 1. The average and maximum daily bilgewater OWS discharge flow rates for a carrier (CVN 74) of 3,000 and 25,000 gallons per day (gpd), respectively, represents the average and maximum daily bilgewater/OWS flow for all aircraft carriers.

2. The destroyer (DD 963) bilgewater flow estimate of 1,000 to 3,000 gpd represents a typical range of flows for other U.S. Navy surface ship classes. An average of 2,000 gpd is assumed to be the average bilgewater generation rate.
3. Aircraft carriers spend approximately 147 days in port annually.
4. Other ships are in port for approximately 193 days annually.
The calculations used to estimate the total fleet bilgewater OWS effluent discharge to surface waters within 12 n.m. are presented as follows:

CVN 68 Class

F CVN 

### (flow rate) = ( R CVN 

### )( D CVN 

### ) ( N CVN 

### ) R CVN 

### = ship flow rate, gpd D CVN 

### = days in port annually per ship N CVN 

### = number of ships

F CVN 

### = (3,000) (147) (11) = 4.9 million gallons per year

Other Ship Classes

F O 

### (flow rate) = ( R O 

### ) ( D O 

### ) ( N O 

### )

F O 

### = (2,000) (193) (220) = 84.9 million gallons per year

Overall Fleet

F FLEET 

### = F CVN 

### (million gals/year) + F O 

### (million gals/year)

F FLEET 

### = 4.9 + 84.9 = 89.8 million gallons per year

It should be noted that bilgewater generation rates are based on data available from existing reports for U.S. Navy ships and does not include “estimates of bilgewater” from ships of other services.

3.3 Constituents
Information about the constituents of bilgewate r comes from several studies conducted aboard Navy vessels and at Navy ports, in addition to the UNDS Phase I testing. During these

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 6 previous studies, samples of bilgewater were collected from a variety of Navy vessels, including aircraft carriers, cruisers, destroyers, dock landing ships, tank landing ships, amphibious assault ships, amphibious transport docks, and submarines. There have been no similar studies or documentation available for the other services.
Bilgewater samples collected in the previo us studies were analyzed for a variety of parameters, such as classicals, metals, and organics (including pesticides). Over 25 priority pollutants were identified from these samples, including metals such as arsenic, copper, cadmium, chromium, lead, mercury, selenium, and zinc; and organics such as benzene, the BHC isomers (isomers of hexachlorocyclohexane), ethyl benzene, heptachlor, heptachlor epoxide, naphthalene, phenols, phthalate esters, toluene, trichlorobenzene, and trichloroethane. The bioaccumulators identified in these samples were the BHC isomers and mercury. A variety of substances that are neither priority pollutants nor bioaccumulators were also detected, including metals such as barium and manganese and organics such as chloroform and xylene.
The analytical results from these studies are shown in Tables 4 through 8. The results provide a general overview of the constituents that have historically been detected in bilgewater and the effluent from bilgewater OWS treatment.

3.4 Concentrat ions
The concentrations of constituents detected during UNDS Phase I testing of bilgewater/OWS effluent samples collected aboard an aircraft carrier (CVN 74) are summarized in Table 9. Many of the same constituents that were detected in the previous studies were also detected in the aircraft carrier samples. This includes classicals, oil & grease as indicated by hexane extractable materials (HEM) or total petroleum hydrocarbons (TPH) as indicated by silica gel treated hexane extractable materials (SGT-HEM), certain metals, and the bioaccumulator, mercury. Neither pesticides nor PCBs were detected in the aircraft carrier bilgewater/OWS samples. Table 10 presents the general statistics of the aircraft carrier data.
Analytical results from previous bilgewater studies are shown in Tables 4 through 8. These tables provide concentrations of constituents that have historically been detected in bilgewater and the effluent from bilgewater OWS treatment.

4.0 NATURE OF DISCHARGE ANALYSIS

Based on the disch arge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. Estimated constituent mass loadings are presented in Section 4.1. In Section 4.2, the available concentration data for the discharge constituents are evaluated, including comparison with federal and state water quality criteria. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loading

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 7 Validated bilgewater/OWS constituen t concentration data from the aircraft carrier 4 

### and the flow rate estimates referenced in NOD report Section 3.2 were used to estimate the mass loading of pollutants to the environment. Historical data were not used to estimate mass loadings because these data were not validated.
Table 11 provides a bilgewater/OWS effluent mass loading summary for all constituents detected in the aircraft carrier samples. Sampling data have identified copper, nickel, and zinc as exceeding Federal water quality criteria (in addition to the most stringent state criteria) in the bilgewater/OWS samples analyzed. Also, the concentrations for ammonia, nitrogen (as nitrate/nitrite and total kjeldahl nitrogen), phosphorous, iron, and total petroleum hydrocarbons exceeds the most stringent state water quality criteria.
The constituent loading estimates are based on the assumption that vessels with an onboard OWS system will always process bilgewater through the system and discharge the effluent overboard while in-port, rather than off-loading untreated bilgewater to shore facilities for disposal.
Sample calculations for TPH, as indicated by SGT-HEM, are provided to show how the total fleet constituent discharges to surface waters less than 12 n.m. from shore were calculated. The assumptions and calculations are presented below.

1. The total amount of OWS effluent discharged annually from aircraft carriers is 4.9 million gallons (Table 3).

2. The sample data from CVN 74 (Table 10) are assumed to be representative of all aircraft carriers.

The mass loading of constituents for the entire fleet can be estimated by multiplying the estimate for aircraft carriers by a discharge ratio. The discharge ratio is the total fleet discharge rate divided by the total discharge from aircraft carriers. Use of this ratio to estimate fleet mass loadings assumes sample data from CVN 74 (Table 10) is representative of all vessels of the armed forces. M(tph) CVN (pounds/year) = ( V CVN (million gals/year)) ( C CVN (mg/Liter)) ( CF )



### where: V CVN 

### = Total bilgewater/OWS generation rate/year C CVN 

### = TPH (SGT-HEM) concentration CF = conversion factor = 8.34 = (3.785 liters/gal) (1x10 6 

### gals/million gals) (454 grams/pound) (1,000 mg/gram)

M CVN 

### = (4.9) (9.64) (8.34) = 394 pounds/year

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 8 2. Ratioing the total flow for the fleet (89.8 mgd) to the aircraft carrier class (CVN 68) flow for (4.9 mgd) , and multiplying the aircraft carrier loading by the ratio.

4.2 Environmental Concentrations
Table 11 identifies bilgewater OWS effluent constituents in the aircraft carrier samples whose log mean average concentrations (dissolved and/or total) were above Federal water quality criteria, and/or the most stringent state water quality criteria. With regard to oil concentration data, the samples were analyzed for HEM and SGT-HEM. The HEM values correspond to oil and grease and the SGT-HEM values correspond to total petroleum hydrocarbon (TPH) which is a subset of oil and grease.

4.3 Potential for Introducing Non-indigenous Species
There is a low potential for transporting non-indigenous species in this discharge. There is only minor seawater access to bilge compartments, and bilgewater is generally processed before it is transported over long distances.

5.0 CONCLUSIONS
Surface vessel bilgewater and OWS discharges have the potential to cause an adverse environmental effect for the following reasons:
1) Bilgewater, if discharged without treatment, would contribute significant amounts of oil to the environment at concentrations exceeding water quality criteria and discharge standards.
2) OWS effluent contributes significant amounts of oil to the environment at concentrations exceeding water quality criteria and discharge standards.

6.0 DATA SOURCES AND REFERENCES
To characterize this discharge, information from various sources was obtained. Process information and assumptions were used to estimate the rate of discharge

. Based on this estimate and on the reported concentrations of oil and grease constituents, the concentrations of the oil and grease constituents in the environment resulting from this discharge were then estimated. M FLEET 

### = (F FLEET 

### / F cvn 

### ) (M CVN 

### )

M FLEET 

### = (89.8/4.9)(394)=7220 pounds/year

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 9 Table 12 shows the source of the data used to develop this NOD Report.

1. Bilgewater Characterization and Generation Surveys Aboard DD-963 Class Ships. April, 1981. David Taylor Naval Ship Research and Development Center. Report #: DTNSRDC/SME-81/09.

2. In-Port Oily Wastewater Generation on USS ARLEIGH BURKE (DDG 51), NSWCCD-TR63-96/37. November 1996.

3. USS John C. Stennis (CVN 74) OWS log sheets obtained from CVN 74 by J. Jereb of DLS Engineering Assoc. and submitted to Malcolm-Pirnie via facsimile on February 13, 1997.

4. Correspondence from Commander, Naval Surface Warfare Center, Carderock Division, Philadelphia Site to Commander, Naval Sea Systems Command (Code 03L13), Uniform National Discharge Standards (UNDS) Sampling Program Data, Ser 631/225, 1-6310-280, dated June 19, 1997.

5. The Characterization of Bilgewater Aboard U.S. Navy Ships. October 1992. Naval Surface Warfare Center Carderock Division. Tech. Report #: CDNSWC/SME-CR-10-91.

6. Weaver, George, An Analysis of Bilgewater. Undated, Analytical data for period from 1993 to 1995. Navy Public Works Center Environmental Department, Naval Station San Diego.

7. Wastewater Characterization Data from USS L Y Spear (AS 36) and USS Carney (DDG 64), NSWCCD, 6330-270/KA, February 19, 1997, Enclosures (4) and (6).

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 10 Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Navy Small Craft Bilge Generation and Characterization. March, 1987. David W. Taylor Naval Ship Research and Development Center, Report No. DTNSRDC/SME-86/32.
Personal Communication between C. Geiling, Malcolm-Pirnie, and Brian Gordon, NAVSTA San Diego, Week of February 17, 1997, Topic of discussion: bilgewater characterization.
Environmental and Natural Resources Program Manual, OPNAVINST 5090.1B, Department of the Navy, November 1, 1994.
Department of Defense (DoD) Directive 6050.15 of 14 June 1985, Prevention of Oil Pollution from Ships Owned or Operated by the DoD (NOTAL).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.
The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.
UNDS Equipment Expert Meeting Minutes. “Surface Vessel Bilgewater and Oily Waste”. July 29, 1996.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 11 Pentagon Ship Movement Data for Years 1991-95, March 4, 1997.
UNDS Phase I Sampling Data Report, Volumes 1-13, October 1997.
UNDS Ship Database, August 1, 1997.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 12 Figure 1. U.S. Navy Oil Water Separator (OWS) Process Flow Diagram (Typical)

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 13 Table 1. Vessels Equipped With Oil/Water Separator Systems

SHIP CLASSIFICATION INFORMATION TRANSIT INFORMATION CLASS ARMED CLASS NO. OF PROPULSION TRAN- DAYS IN ID NO. SERVICE NAME SHIP TYPE SHIPS SYSTEM SITS PORT AE 26 MSC Kilauea Ammunition Ship 8 Steam 4 26 AFS 1 MSC Mars Combat Store Ship (ROS) 8 Steam 7 148 AG 194 MSC Vanguard Navigation Research Ship 2 Steam 10 151 AGF 3 NAVY Austin (Converted) Miscellaneous Command Ship 1 Steam NA NA AGF 11 NAVY Austin (Converted) Miscellaneous Command Ship 1 Steam NA NA AGM 22 MSC Converted Haskell Missile Range Instrumentation Ship 1 Steam 4 133 AGOS 1 MSC Stalwart Ocean Surveillance Ship 5 Diesel 4 70 AGOS 19 MSC Victorious Ocean Surveillance Ship 4 Diesel 5 107 AGS 26 MSC Silas Bent and Wilkes Surveying Ship 2 Diesel 6 44 AGS 45 MSC Waters Surveying Ship 1 Diesel 1 7 AGS 51 MSC John McDonnell Surveying Ship 2 Diesel 6 96 AGS 60 MSC Pathfinder Surveying Ship 4 Diesel NA NA AH 19 MSC Mercy Hospital Ship (ROS) 2 Steam 2 184 AKR 287 MSC Algol Vehicle Cargo Ship (ROS) 8 Steam 3 109 AKR 295 MSC NA Vehicle Cargo Ship (ROS) 3 Diesel NA NA AO 177 NAVY Jumboised Cimarron Oiler 5 Steam 10 188 AO 187 MSC Henry J. Kaiser Oiler 12 Diesel 6 78 AOE 1 NAVY Sacramento Fast Combat Support Ship 4 Steam 11 183 AOE 6 NAVY Supply Fast Combat Support Ship 3 Gas 6 114 AR NAVY Vulcan Repair Ship 6 Steam 8 131 ARC 7 MSC Zeus Cable Ship 1 Diesel 2 8 ARS 50 NAVY Safeguard Salvage Ships 4 Diesel 22 208 AS 33 NAVY Simon Lake Submarine Tender 1 Steam 6 229 AS 39 NAVY Emory S Land Submarine Tender 3 Steam 6 293 ATF 166 MSC Powhatan Fleet Ocean Tug 7 Diesel 16 127 BD ARMY 264B Barge Derrick(Floating Cranes) 12 Diesel NA NA BO USCG NA Buoy Boat 5 Diesel NA NA BOSL USCG NA Stern Loading Buoy Boat 14 Diesel NA NA CG 47 NAVY Ticonderoga Guided Missile Cruiser 27 Gas 12 166 CGN 36 NAVY California Guided Missile Cruiser 2 Nuclear 11 143 CGN 38 NAVY Virginia Guided Missile Cruiser 1 Nuclear 11 161 CV 63 NAVY Kitty Hawk Aircraft Carrier 3 Steam 7 137 CVN 65 NAVY Enterprise Aircraft Carrier 1 Nuclear 6 76 CVN 68 NAVY Nimitz Aircraft Carrier 7 Nuclear 7 147 DD 963 NAVY Spruance Destroyer (Typical) 31 Gas 12 178 DDG 51 NAVY Arleigh Burke Guided Missile Destroyer 18 Gas 11 101 DDG 993 NAVY Kidd Guided Missile Destroyer 4 Gas 12 175 FFG 7 NAVY Oliver Hazard Perry Guided Missile Frigate 43 Gas 13 167 LCC 19 NAVY Blue Ridge Amphibious Command Ship 2 Steam 8 179 LCU ARMY 2000 Utility Landing Craft 48 Diesel NA NA LHA 1 NAVY Tarawa Amphibious Assault Ship 5 Steam 9 173 LHD 1 NAVY Wasp Amphibious Assault Ship 4 Steam 13 185

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 14 Table 1. Vessels Equipped With Oil/Water Separator Systems (cont'd)

SHIP CLASSIFICATION INFORMATION TRANSIT INFORMATION CLASS ARMED CLASS NO. OF PROPULSION TRAN- DAYS IN ID NO. SERVICE NAME SHIP TYPE SHIPS SYSTEM SITS PORT LPD 4 NAVY Austin Amphibious Transport Dock 3 Steam 11 178 LPD 7 NAVY Austin Amphibious Transport Dock 3 Steam 12 188 LPD 14 NAVY Austin Amphibious Transport Dock 2 Steam 11 192 LPH 2 NAVY Iwo Jima Amphibious Assault Helicopter Carrier 2 Steam 11 186

LSD 36 NAVY Anchorage Dock Landing Ship 5 Steam 13 215 LSD 41 NAVY Whidbey Island Dock Landing Ship 8 Diesel 13 170 LSD 49 NAVY Harpers Ferry Dock Landing Ship 3 Diesel NA NA LST 1179 NAVY Newport Tank Landing Ship 3 Diesel 13 191 LSV ARMY Frank S Besson Vehicle Landing Ship 6 Diesel NA NA LT ARMY 100 / 130 Large Tug 25 Diesel NA NA MCM 1 NAVY Avenger Mine Countermeasure Vessel 14 Diesel 28 232 MHC 51 NAVY Osprey Minehunters Coastal 12 Diesel NA NA WAGB 290 USCG Mackinaw Icebreaker 1 Diesel NA NA WAGB 399 USCG Polar Icebreaker 2 Diesel 4 139 WHEC 378 USCG Hamilton/Hero Class High Endurance Cutter 12 Diesel 13 151 WIX 295 USCG Eagle Sail Training Cutter 1 Diesel 7 188 WLB 180A USCG Balsam Seagoing Tender 8 Diesel 18 190 WLB 180B USCG Balsam Seagoing Tender 2 Diesel 5 120 WLB 180C USCG Balsam Seagoing Tender 13 Diesel 16 123 WLB 225 USCG Juniper Seagoing Tender 2 Diesel NA NA WLI 65303 USCG Blackberry Buoy Tender, Inland 2 Diesel NA NA WLI 65400 USCG Bayberry Buoy Tender, Inland 2 Diesel NA NA WLI 100A USCG Blue Bell Buoy Tender, Inland 1 Diesel NA NA WLI 100C USCG Blue Bell Buoy Tender, Inland 1 Diesel NA NA WLIC 75A USCG Anvil/Clamp Construction Tenders, Inland 2 Diesel NA NA WLIC 75B USCG Anvil/Clamp Construction Tenders, Inland 3 Diesel NA NA WLIC 75D USCG Anvil/Clamp Construction Tenders, Inland 2 Diesel NA NA WLIC 100 USCG Cosmos Construction Tenders, Inland 3 Diesel NA NA WLIC 115 USCG ? Construction Tenders, Inland 1 Diesel NA NA WLIC 160 USCG Pamlico Construction Tenders, Inland 4 Diesel NA NA WLM 157 USCG Red Buoy Tender, Coastal 9 Diesel NA NA WLM 551 USCG Keeper Buoy Tender, Coastal 2 Diesel NA NA WLR 65 USCG Ouachita Buoy Tender, River 6 Diesel NA NA WLR 75 USCG F/Gasconade Buoy Tender, River 13 Diesel NA NA WLR 115 USCG Sumac Buoy Tender, River 1 Diesel NA NA WMEC 210A USCG Reliance Medium Endurance Class 5 Diesel 13 235 WMEC 210B USCG Reliance Medium Endurance Class 11 Diesel 9 149

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 15 Table 1. Vessels Equipped With Oil/Water Separator Systems (cont'd)

SHIP CLASSIFICATION INFORMATION TRANSIT INFORMATION CLASS ARMED CLASS NO. OF PROPULSION TRAN- DAYS IN ID NO. SERVICE NAME SHIP TYPE SHIPS SYSTEM SITS PORT WMEC 213 USCG Diver Medium Endurance Class 1 Diesel 9 98 WMEC 230 USCG Storis Medium Endurance Class 1 Diesel 11 167 WMEC 270A USCG Bear Medium Endurance Class 4 Diesel 6 137 WMEC 270B USCG Bear Medium Endurance Class 9 Diesel 7 164 WPB 82C USCG Point Patrol Craft 28 Diesel NA NA WPB 82D USCG Point Patrol Craft 8 Diesel NA NA WPB 110A USCG Island Patrol Craft 16 Diesel 2 72 WPB 110B USCG Island Patrol Craft 21 Diesel 7 137 WPB 110C USCG Island Patrol Craft 12 Diesel 5 157 WTGB 140 USCG Bay Icebreaking Tug 9 Diesel 1 8 WYTL 65A USCG NA Harbor Tug 3 Diesel NA NA WYTL 65B USCG NA Harbor Tug 3 Diesel NA NA WYTL 65C USCG NA Harbor Tug 3 Diesel NA NA WYTL 65D USCG NA Harbor Tug 2 Diesel NA NA TOTAL: 640 AVG: 9 145

Subtotals: Navy 231 13 197 MSC 70 5 92 USCG 248 8 140 Army 91 NA NA

Notes: 1. NA = Information not available 2. One transit = travel from one port to another, or from one port to sea and returning back to same port.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 16 Table 2. In-Port Bilgewater Generation Rates 1,2,3



### Ship Class Gal/Day (Range) Avg Gal/Day DD 963 1,000-3,000 2,000 DDG 51 N/A 335 CVN 68 * 

### 5,000-25,000 3,000

* Values based on recording information over a 30 day period. All bilgewater was processed by the OWS during six individual days, in volumes ranging from 5,000 to 25,000 gallons per processing event. The total volume processed over 30 days was 91,000 gallons, yielding an average daily processing rate of 3,000 gallons per day.

Table 3. In-Port Bilgewater/OWS Discharge Rates From U.S. Navy Ships

Average Daily Flow per Ship (gals/day) Annual Flow per Ship (gals/yr) Total Annual Flow (million gals/yr) Ship Class Days in Port Total

Flow No. of

Ships Total

Flow Aircraft Carriers 3,000 147 441,000 11 4.9

All Other Ships (Avg.) 2,000 178 356,000 220 84.9

Total: 89.8

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 17 Table 4. Ship Study Bilgewater Pollutant Summary 5

Biddle CG 34 Vincennes

CG 49 with OWS San Jacinto

CG 56 with OWS Roosevelt

CVN 71 C. DeGrasse

DD 974 H.W. Hill

DD 986 Belleau

Wood LHA 3 Vancouver

LPD 2 with OWS Pensacola

LSD 38 with OWS Manitowoc

LST 1180 with OWS Louisville

SSN 724 TSS (mg/L) 1,440 38 19 519 233 548 1205 62 29 114 169 COD (mg/L) 5,600 530 760 5,400 18,000 11,000 66,000 780 470 1,600 1,100 TOC (mg/L) 644 129 34.6 116 264 4,620 19,040 34 31 224 247 BOD (mg/L) 583 NA 6,740 554 >14,000 842 13,000 <142 98 335 0 O&G (mg/L) 46 27 8 1,550 725 765 5,220 20 4 32 164 Phenols( μ g/

L) 600 110 30 <5,000 <10 40 2,600 10 10 20 310 Cu ( μ g/ L) 6,400 540 430 1,050 5,320 1,180 1,720 790 300 360 1,450 Fe ( μ g/ L) 46,000 810 260 2,560 28,000 18,900 14,600 1,130 1,620 2,600 1,030 Zn ( μ g/ L) 4,300 810 190 1,900 6,560 1,390 16,200 1,590 410 2.5 2,720 Cd ( μ g/ L) 67 10 5 21 156 44 280 <3 <5 14 82 Ag ( μ g/ L) 10 <10 10 <50 <10 <10 80 10 <10 <10 <10 Ni ( μ g/ L) 3,500 270 130 170 890 550 650 400 210 120 1,590 Mn ( μ g/ L) 3,000 220 20 140 1,350 1,150 370 61 110 210 269 Pb ( μ g/ L) 230 20 <20 <30 2,900 30 270 20 50 <50 60 As ( μ g/ L) 3 6 6 3 7 <4 18 10 4 2 4 Ba ( μ g/ L) 170 63 60 85 <100 60 122 16 40 50 57 Note: Values are not necessarily representative. Concentrations were determined from only one sample per ship class per constituent. NA : Information not available < : Less than

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 18 Table 5. Ship Study OWS Influent and Effluent Contaminant Concentration Data 5

USS VINCENNES (CG 49) USS SAN JACINTO (CG 56) USS VANCOUVER (LPD 2) USS PENSACOLA (LSD 38) USS MANITOWOC (LST 1180) Parameter Units Influent Effluent Influent Effluent Influent Effluent Influent Effluent Influent Effluent

COD BOD TOC TSS O&G Ammonia Fecal Coliform mg/L mg/L mg/L mg/L mg/L mg/L cts/100 ml 660

NA 145 34 37 2.2 NA 530

NA 129 38 27 1.1 NA 810

94 56.8 62 143 <0.10 49 760

6,740 34.6 19 8 <0.10 94 900

<142 42 123 47 0.18 NA 780

<142 34 62 20 0.29 NA 520

101 39 41 10 <0.10 110 470

98 31 29 4 <0.10 49 2,800

341 570 2,684 2,593 NA 2 1,600

335 224 114 32 NA 240

Total Phenols Cyanide mg/L mg/L 130

<10 110

<10 10

<10 30

10 10

<30 10

<50 20

10 10

40 NA

<10 20

NA

Arsenic Barium Cadmium Chromium Copper Iron Lead Manganese Nickel Selenium Zinc μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L 4

59 9 <10 830 770 50 230 290 3 800 6

63 10 <10 540 810 20 220 270 <2 810 6

20 <5 <10 490 280 <20 10 100 12 80 6

60 5 <10 430 260 <20 20 130 8 190 8

10 <3 <10 2,930 1,240 40 51 310 15 670 10

16 <3 <10 790 1,130 20 61 400 17 1,590 4

30 <5 <50 560 2,960 <50 80 250 2 380 4

40 <5 <50 300 1,620 <50 110 210 2 410 6

40 17 770 430 2,.900 50 250 120 40 3,000 2

50 14 590 360 2,600 <50 210 120 40 2,500 Bis(2-ethylhexyl) phthalate 4-Nitrophenol Phenanthrene 1,2,4-Trichlorobenzene 1,1,1- Trichloroethane μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L <200

<400 <200 <200 <5 <10

<20 23.7 28.3 <5 <200

<200 <200 <200 <50 <100

<100 <100 <100 <50 11.2

10 <10 <10 NA 61.8

<20 <10 <10 <5 <100

<100 <100 <100 <50 <100

<100 <100 <100 <500 <200

<200 <200 <200 45,000 <200

<200 <200 <200 6,000 Alpha-BHC Beta- BHC Gamma-BHC Heptachlor Heptachlor Epoxide μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L 0.047

<0.999 <0.02 0.460 0.379 0.077

<0.580 <0.02 0.209 0.274 <0.05

<0.5 16 <0.05 <0.05 <0.05

<0.5 60 <0.05 <0.05 0.02

4.45 <0.02 <0.02 <0.02 <0.02

<0.10 <0.02 <0.02 <0.02 <0.05

<12 <0.05 <0.05 <0.05 <0.05

<5 0.5 <0.05 <0.05 <0.25

<2.5 <0.25 <0.25 <0.25 <5

<50 <5 <5 <5

NA = Data not available

Note: Values are not necessarily representative. Concentrations were determined from only one sample per ship class per constituent.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 19 Table 6. Naval Station San Diego Bilgewater Characterization Data Summary 6



### (Calendar Years 1993 through 1995)

Values Above MDL (units in μ g/ L)

Parameter No. of

Analyses No. Of

Values Min. Max. Median Std. Dev.

Oil & Grease Phenols 45 83 45

12 5

15 12,900

901 146

116 2,234

0.309 Antimony Arsenic Cadmium Chromium Copper Lead Nickel Selenium Silver Thallium Zinc (a) (a) 84 85 85 85 85 1 84 (a) 82 (a)

(a) 33 31 84 52 83 0 14 (a) 80 (a)

(a) 10 20 10 39 20 NA 4 (a) 100 80

1 610 2,320 80,400 3,360 10,300 NA 1,440 277 97,000 (a)

(a) 20 70 420 100 150 NA 23 (a) 688 (a)

(a) 118 492 9,250 509 1,590 NA 398 (a) 14,500 Benzene Chloroform Ethyl Benzene Methylene Chloride Tetrachloroethane Toluene Xylene 82 81 81 68 82 80 17 29

1 38 18 7 52 12 0.5

47 6 5 7 5 28 179

47 1,360 4,220 74 2,220 9,440 30

47 50 16 18 77 16 42

NA 221 1,000 24 383 2,600 2,4-Dimethyl Phenol Fluorene Naphthalene 82 83 79 14

41 37 30

5 11 840

1,890 3,070 89

42 85 23

411 613

NOTES: (a) References contain summary tables and raw data laboratory logs that are incomplete. Summary tables indicate single peak results for antimony, arsenic and thallium in 1993. However, log sheets showing the corresponding data are not included. The above statistical analysis is based on log sheet data that was provided, except for the maximum values shown for the three metals, which were obtained from the PWC summary table for 1993.

(b) NA = Information not available.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 20 Table 7. Navy Destroyer (DDG 64) OWS Effluent Discharge Data Summary 7

May to September, 1996

Values Above MDL ( μ g/ L)
Parameter No. of

Analyses No. Of

Values Min. Max. Median Std. Dev.

Oil in Water (Navy) 28 28 13 670 151 205
Arsenic Barium Cadmium Chromium Copper Lead Iron Manganese Mercury Nickel Selenium Silver Zinc 11 18 18 18 18 18 18 18 18 18 11 18 18 6

18 3 10 18 15 18 18 2 18 11 1 18 10

30 10 10 430 10 300 20 10 140 70 10 480 70

535 10 60 6,110 195 4,620 150 10 1,510 210 10 8,880 20

118 10 20 1,.410 40 1,280 48 10 320 100 10 2,190 23

124 NA 16 1,400 62 1,210 41 NA 317 40 NA 1,930

July 30, 1996 ( μ g/ L) Sample A Sample B Sample C Parameter NRL LLI NRL LLI NRL LLI Oil and Grease (EPA 418.1) Petroleum Hydrocarbons MBAS ---

---

--- 29

38 0.13 ---

---

--- 70

73 0.11 ---

---

--- 66

70 0.16 Benzene Ethylbenzene Methylene Chloride Toluene Xylene (total) 79 71 <5 170 460 50

59 64 80 289 77

59 <5 170 450 49

54 63 78 266 70

64 <5 150 410 55

54 20 81 264 Diethyl Phthalate 2,4-Dimethylphenol Dimethyl Phthalate Fluorene Naphthalene Phenanthrene Phenol ---

---

---

---

---

---

--- <10

110 11 12 63 16 46 ---

---

---

---

---

---

--- 10

110 12 17 61 27 47 ---

---

---

---

---

---

--- 12

110 13 20 14 30 30

NOTES: (a) Volatile and semi-volatile analysis performed on random samples collected over two hour period.

Sample A during first hour. Samples B and C during second hour. (b) LLI = Lancaster Labs Inc. NRL = Naval Research Laboratory. (c) --- = Samples were not analyzed by LLI for the parameters shown. (d) NA = Information not available (e) < = less than

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 21 Table 8. Auxiliary Ship (AS 36) OWS Effluent Discharge Data Summary 7



### (May 2 through September 12, 1996)

Values Above MDL ( μ g/ L)
Parameter Method

Detection Level No. of

Analyses No. of

Values Min. Max. Median Std. Dev.
Oil in Water BOD COD TSS NA NA NA NA 44

8 14 10 44

8 14 10 0.5

1 26 1 93

34 260 57 5.4

3.5 61 12.5 20.1

10.1 79.5 16 Antimony Arsenic Beryllium Cadmium Chromium Copper Lead Iron Mercury Nickel Selenium Silver Thallium Zinc 600 10 5 10 20 NA 100 NA 0.2 NA 10/5 30 10 NA 14

14 14 14 14 14 14 11 14 14 14 14 14 14 0

0 0 0 0 14 0 11 1 14 0 0 14 14 NA

NA NA NA NA 44 NA 786 1.6 75 NA NA NA 164 NA

NA NA NA NA 661 NA 2,200 1.6 471 NA NA NA 1,100 NA

NA NA NA NA 257 NA 1,050 NA 117 NA NA NA 382 NA

NA NA NA NA 166 NA 427 NA 103 NA NA NA 283
NOTE: NA = Information not available.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 22 Table 9. Aircraft Carrier (CVN 74) Oil/Water Separator Influent/Effluent Raw Data 4

CVN 74-OWSI-01 CVN 74-OWSI-02 CVN 74-OWSI-03 CVN 74-OWSI-04 Parameter Units Influent Effluent Influent Effluent Influent Effluent Influent Effluent

COD BOD TOC TSS O&G TKN Ammonia Nitrate + Nitrite (As N) Total Phosphorous mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L mg/L 132

31 28 38 50 1.6 0.14 054 3.2 179

5 9 64 22 1.7 <0.10 0.20 1.2 258

17 24 38 269 2.0 0.19 0.44 3.7 258

11 21 46 17 1.7 0.17 0.30 2.7 86

18 26 36 42 1.4 0.15 0.50 3.9 148

18 20 48 36 1.6 0.17 0.40 2.2 195

22 19 70 122 1.2 <0.10 0.62 3.1 148

10 11 23 27 1.0 <0.10 0.0 2.0

TDS Chloride Sulfate Sulfide Total Alkalinity mg/L mg/L mg/L mg/L mg/L 7,360

4,126 498 5 36 16,620 9,742 1,290 2 64 5,570 3,616 411 10 40 9,720 7,359 643 8 46 5,920 3,531 446 10 40 10,260 8,125 780 8 48 8,970 3,956 643 10 48 13,320 8,040 958 5 58
Cyanide μ g/ L <10 <10 <10 <10 <10 <10 NA <10

Aluminum Antimony Arsenic Barium Beryllium Cadmium Chromium Copper Iron Lead Manganese Nickel Selenium Silver Thallium Zinc μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L μ g/ L 69(B)

<20 <10 49 1(B) 6 <10 581 455 <46 34 304 <20 5(B) <10 1,590 229

<2 33 32 <1 <5 <10 284 482 <46 29 98 <20 <5 <10 519 74(B)

<20 <1 50(B) <1 5.7 <10 567 471 <46 34 318 <31.5 <5 <10 1,760 108(B)

2.6(B) 3(C) 43(B) <1 <5 <10 426 442 <46 33 245 41(C) 5(B) <10 1,330 83(B) 5.6(B) <1 55(B) <1 5.1 <10 554 560 <46 37 321 <20 <5 <10 1,840 104(B)

<20 33(B) 40(B) <1 5.6 <10 363 432 <46 30 208 <20 <5 <10 1,110 143(B)

<20 <1 44(B) <1 <5 <10 574 610 <46 35 277 26(C) <5 <10 1,350 220

<10 <1 34(B) <1 <5 <10 316 531 <46 31 162 <20 <5 <10 786

Bis(2-ethylhexyl) phthalate N,N-Dimethylformamide Toluene Xylene (o+p) μ g/ L μ g/ L μ g/ L μ g/ L <10

99 14 24 <10

33 <10 <10 30

124 12 20 <10

88 <10 13 22 102 13 19 <10 65 <10 <10 38

85 12 19 <10

58 <10 12

Note: (a) < = less than

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 23 Table 10. Summary of Detected Analytes: Oil/Water Separator Effluent Data

Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Mass

Loading (lbs/yr) Oil Water Separator Effluent Classicals (mg/L) ALKALINITY 53.51 4 of 4 46 64 40,013 AMMONIA AS NITROGEN 0.09 2 of 4 BDL 0.17 67 BIOCHEMICAL OXYGEN DEMAND 8.78 3 of 4 BDL 18 6,565

CHEMICAL OXYGEN DEMAND (COD) 178.34 4 of 4 148 258 133,356

CHLORIDE 8273.63 4 of 4 7360 9740 6,186,728 HEXANE EXTRACTABLE MATERIAL 23.54 4 of 4 17.5 27 17,602

NITRATE/NITRITE 0.27 4 of 4 0.2 0.4 202 SGT-HEM 9.64 4 of 4 6 16 7,208 SULFATE 887.29 4 of 4 643 1290 663,484 TOTAL DISSOLVED SOLIDS 13238.57 4 of 4 9720 21600 9,899,334 TOTAL KJELDAHL NITROGEN 1.5 4 of 4 1.1 1.7 1,122 TOTAL ORGANIC CARBON (TOC) 14.53 4 of 4 9.3 21 10,865

TOTAL PHOSPHOROUS 1.81 4 of 4 1.2 2.7 1,353 TOTAL RECOVERABLE OIL AND GREASE 39.96 4 of 4 15.05 173 29,881

TOTAL SULFIDE (IODOMETRIC) 5.03 4 of 4 2 8 3,761

TOTAL SUSPENDED SOLIDS 42.46 4 of 4 23 64 31,750 VOLATILE RESIDUE 13285.59 4 of 4 9770 21600 9,934,494 Hydrazine (mg/L) HYDRAZINE 0.15 4 of 4 0.095 0.2 112 Mercury (ng/L) MERCURY 51.8 4 of 4 32.05 79.8 0.04 Metals ( μ g/L) ALUMINUM Total 154.49 4 of 4 104 230.5 116 ANTIMONY Total 6.15 1 of 4 BDL 2.6 5 ARSENIC Total 6.09 2 of 4 BDL 33 5 BARIUM Dissolved 34.98 4 of 4 27.8 41.8 26 Total 36.58 4 of 4 30.65 42.9 27 BORON Dissolved 1562.43 4 of 4 1280 2030 1,168 Total 1505.6 4 of 4 1240 1945 1,126

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 24 CADMIUM Total 3.06 1 of 4 BDL 5.6 2 CALCIUM Dissolved 135123.39 4 of 4 105000 184000 101,040 Total 129848.08 4 of 4 104000 172500 97,096 COPPER Dissolved 162.56 4 of 4 116 201 122 Total 341.25 4 of 4 277.5 426 255 IRON Total 472.36 4 of 4 432 531 353 MAGNESIUM Dissolved 392878.32 4 of 4 262000 486000 293,780 Total 423465.92 4 of 4 333000 593500 316,653 MANGANESE Dissolved 26.21 4 of 4 22.2 31.1 20 Total 30.35 4 of 4 28.25 32.5 23 MOLYBDENUM Dissolved 21.29 4 of 4 18.6 24.3 16 Total 9.29 2 of 4 BDL 28.1 7 NICKEL Dissolved 176.4 4 of 4 109 247 132 Total 168.54 4 of 4 97.75 245 126 SODIUM Dissolved 3606853.89 4 of 4 2680000 5200000 2,697,078 Total 3585080.31 4 of 4 2770000 5000000 2,680,796 TIN Total 16.59 1 of 4 BDL 41.2 12 TITANIUM Total 4.5 2 of 4 BDL 9.2 3 ZINC Dissolved 855.7 4 of 4 511 1260 640 Total 878.8 4 of 4 514 1330 657 Organics ( μ g/L) N,N-DIMETHYLFORMAMIDE 57.3 4 of 4 32.5 88 43 O+P XYLENE 7.9 2 of 4 BDL 13 6 Pesticides ( μ g/L) 2,4-DB 1.66 2 of 4 BDL 2.88 1 DICAMBA 0.29 3 of 4 BDL 0.48 0.2 MCPA 28.45 1 of 4 BDL 58.9 21 MCPP 113.25 4 of 4 41.3 167 85 PYRETHRIN I 183 1 of 1 183 183 137 Log normal means were calculated using measured analyte concentrations. When a sample set contained one or more samples with the analyte below detection levels (i.e., "non-detect" samples), estimated analyte concentrations equivalent to one-half of the detection levels were used to calculate the mean. For example, if a "non-detect" sample was analyzed using a technique with a detection level of 20 mg/L, 10 mg/L was used in the log normal mean calculation.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 25 Table 10 a. Estimated Annual Mass Loadings of Constituents

Constituent Log Normal Mean Frequency of

Detection Minimum

Concentration Maximum

Concentration Mass Loading

(lbs/yr) Classicals (mg/L) AMMONIA AS NITROGEN 0.09 2 of 4 BDL 0.17 67 NITRATE/NIRITE 0.27 4 of 4 0.2 0.4 202 TOTAL KJELDAHL NITROGEN 1.5 4 of 4 1.1 1.7 1,122

TOTAL NITROGEN A 1.77 1,304 TOTAL PHOSPHOROUS 1.81 4 of 4 1.2 2.7 1,353 SGT-HEM 9.64 4 of 4 6 16 7,208 Mercury (ng/L) MERCURY 51.8 4 of 4 32.05 79.8 0.04 Metals ( μ g/L) COPPER Dissolved 162.56 4 of 4 116 201 122 Total 341.25 4 of 4 277.5 426 255 IRON Total 472.36 4 of 4 432 531 353 NICKEL Dissolved 176.4 4 of 4 109 247 132 Total 168.54 4 of 4 97.75 245 126 ZINC Dissolved 855.7 4 of 4 511 1260 640 Total 878.8 4 of 4 514 1330 657 Notes: A - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen.

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 26 Table 11. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituent Log

Normal Mean Minimum Concentration Maximum

Concentration Federal Acute Water Quality Criteria Most Stringent State

Acute Water Quality Criteria Classicals (mg/L) AMMONIA AS NITROGEN 0.09 BDL 0.17 None 0.006 (HI) A

NITRATE/NITRITE 0.27 0.2 0.4 None 0.008 (HI) A TOTAL KJELDAHL NITROGEN 1.5 1.1 1.7 None

-

TOTAL NITROGEN B 1.77 None 0.2 (HI) A

TOTAL PHOSPHOROUS 1.81 1.2 2.7 None 0.025 (HI) A

TPH (SGT-HEM) 9.64 6 16 visible sheen a / 15 b 5 (FL) Mercury (ng/L) MERCURY * 51.8 32.05 79.8 1800 25 (FL, GA) Metals ( μ g/L) COPPER Dissolved 162.56 116 201 2.4 2.4 (CT, MS) Total 341.25 277.5 426 2.9 2.5 (WA) IRON Total 472.36 432 531 None 300 (FL) NICKEL Dissolved 176.4 109 247 74 74 (CA, CT) Total 168.54 97.75 245 74.6 8.3 (FL, GA) ZINC Dissolved 855.7 511 1260 90 90 (CA, CT, MS) Total 878.8 514 1330 95.1 84.6 (WA) Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995) A - Nutrient criteria are not specified as acute or chronic values. B - Total Nitrogen is the sum of Nitrate/Nitrite and Total Kjeldahl Nitrogen. * - Mercury was not found in excess of WQC; concentration is shown only because it is a bioaccumulator.

CA= California CT = Connecticut FL = Florida GA = Georgia HI = Hawaii MS = Mississippi WA = Washington

a Discharge of Oil , 40 CFR 110, defines a prohibited discharge of oil as any discharge sufficient to cause a sheen on receiving waters. b International Convention for the Prevention of Pollution from Ships (MARPOL 73/78). MARPOL 73/78 as implemented by the Act to Prevent Pollution from Ships (APPS)

### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 27 Table 12. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation Equipment Literature X

2.2 Releases to the Environment OPNAVINST 5090.1B X

2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X X X 3.3 Constituents X X X 3.4 Concentrations X X 4.1 Mass Loading X X 4.2 Environmental Concentrations X X4.3 Potential for Introducing NonIndigenous Species X

### Underwater Ship Husbandry 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for “...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces, ...” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)—either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Underwater Ship Husbandry

### Underwater Ship Husbandry 2 2.0 DISCHARGE DESCRIPTION
This section describes the underwater ship husbandry discharge and includes information on: the equipment that is used and its operation (Section 2.1), the general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
For the purpose of this evaluation, underwater ship husbandry is defined as the inspection, grooming, maintenance, and repair of hulls and hull appendages performed while a vessel is waterborne. In the case of repairs, they may be classified as permanent (equivalent to dry-dock repair); temporary (to be reworked at the next scheduled dry-docking); and emergency (allowing the ship to transit to a facility for further repair). Underwater ship husbandry includes the following operations: 1
, 2



### • hull cleaning,

• fiberglass repair,

• welding,

• sonar dome repair,

• non-destructive test/inspection,

• masker belt repairs, and

• paint operations, and

• SEAWOLF propulsor layup.
All of these activities are typically conducted while ships are pierside. Cleaning of underwater hulls is the major activity within this category, and is performed on a routine basis. 1 

### Layup of SEAWOLF propulsors occurs approximately 6 times per year. 3 

### The remaining operations are unplanned repair activities incidental to normal vessel operation. 1



### 2.1.1 Underwater Hull Cleaning
Underwater hull cleaning is performed to remove fouling organisms which have adhered to a vessel and its appendages. 4 

### Biological growth is undesirable since it increases ship drag, thereby increasing fuel consumption and decreasing speed. Hull cleanings can be either full cleanings or interim cleanings. Full cleanings are those which include the entire painted underwater hull surface, propellers, and propeller shafts. Interim cleanings include the cleaning of propellers and shafts only.
Hull Coating Systems. Ablative hull coating systems are typically comprised of two coats (layers) of epoxy anticorrosion (AC) paint applied to the bare hull and two coats of copper antifouling (AF) paint applied over the AC coating. The function of the AC coat, in conjunction with cathodic protection, is to prevent hull corrosion. The AC coat also provides bonding between the hull and the AF topcoats. AF topcoats control biological growth by ablating and/or leaching antifouling agents into the surrounding water (as described in the Hull Coating Leachate

### Underwater Ship Husbandry 3 NOD report). The total design thickness of this system is 20 mils (1 mil = 0.001 inches), of which 10 mils are the AF coating, although the actual application may be thicker. 5



### Most ships of the Navy, Military Sealift Command (MSC), and U.S. Coast Guard (USCG) use AF paint qualified to MIL-PRF-24647 “Paint System, Anticorrosive and Antifouling, Ship Hull.” 6,7 

### While several types of AF topcoats conform to this specification, the most common types are ablative, copper-based coatings. 8 

### An ablative coating thins as it erodes or dissolves. Through this action, a fresh layer of antifouling agent (e.g. copper) is exposed, maintaining the paint’s antifouling properties. Self-polishing AF paints are a type of ablative coating which undergoes chemical hydrolysis when it comes into contact with the slightly alkaline seawater. Any toxic agents which are chemically bound to the paint matrix will be released at a rate dependent upon the rate of hydrolysis.
Other vessels of the Armed Forces use non-ablative paint systems which do not appreciably diminish in thickness during service. 7 

### Non-ablative paints containing tributyltin (TBT) are still found on some aluminum-hulled small craft because some copper-based paints are incompatible with aluminum hulls. 8 

### However, TBT paints are no longer approved for any Navy vessel, including aluminum-hulled craft, effective as of fiscal year (FY) 1998. 5,9



### Coating Service Life. Ablative copper AF coatings for naval vessels are designed to meet five-, seven-, or ten-year dry-docking periods. 9 

### Typically, ablative copper AF coatings remain free of fouling for about three years after application before they require in-water hull cleaning. 10 

### After the first cleaning, they typically require an annual hull cleaning, which is usually performed just prior to deployments, to optimize fuel consumption underway. This is only a guideline, since the frequency of cleaning is also influenced by the ship’s schedule and location. 4



### Inspection and Evaluation. Navy vessels are inspected quarterly and before deployments, and are assigned a Fouling Rating (FR) on a scale of 0 to 100. 1,4 

### This rating is established by comparing photographs of the fouled hull with photographic standards representing values on the FR scale. The criteria for performing hull cleaning is FR 40 or higher (for ablative and self-polishing paint systems) over 20% of the ship’s hull; or the presence of FR 50 or higher (for non-ablative paint systems) over 10% of the ship’s hull. 4



### Underwater Hull Cleaning Process. Underwater hull cleaning can be accomplished with hand-held rotary brush units, self-propelled multi-brush cleaning vehicles, water jets, and hand-held scrapers. 4 

### Most often, it is conducted by divers using the Submerged Cleaning and Maintenance Platform (SCAMP) or the similar SeaKlean multi-brush systems. 1 

### These mechanical devices are held next to the hull from the thrust and suction generated by a large impeller, which pumps seawater at approximately 13,500 gallons per minute (gpm). While the brushes rotate and sweep biofouling off of the hull, the system moves forward at a maximum rate of 1 foot per second (ft/sec), but typically at 0.75 ft/sec. A small percentage of the hull, gratings,and struts; which are inaccessible to these multi-brush machines, must be cleaned using handheld single-brush cleaning units. 10

### Underwater Ship Husbandry 4 2.1.2 Other Underwater Repair, Maintenance, And Inspection Processes
Fiberglass Repair. Two activities comprise this class of ship husbandry: fiberglass hull repairs and fiberglass propeller shaft coating repairs. Methods for performing underwater fiberglass hull repairs are still under development, and therefore are not a standard operation. Shafts are coated with fiberglass to prevent corrosion. A confirmed or suspected failure in the fiberglass coating may require an underwater repair, if dry-docking is not imminent. 1



### Fiberglass shaft repairs are performed by divers working in a dry underwater enclosure, or “habitat,” having an opening in the underside for diver access. 11 

### When coating shafts withfiberglass, glass reinforced plastic (GRP) wrapping is applied in accordance with MIL-STD2199, “Glass Reinforced Plastic Coverings for Propeller Shafting.” In this procedure, the shaft is first cleaned with a solvent, typically acetone, to remove grease and oil. Next, four wrappings of fiberglass tape/cloth are made and fixed with a viscous epoxy or polyester resin which hardens into an insoluble plastic. The cure time and working life of the resin vary with the individual brand, temperature, and humidity. However, the total cure time is on the order of 24 hours. The working life of the resin, after the addition of the hardener, is significantly less. The specification states that resin systems may have a working life from 30 minutes to six hours at 73 ° F and as short as 18 minutes at 90 ° F. The specification recommends that a new resin pot be prepared for each wrapping, because it may harden between wrapping passes. 12



### Welding. There are two types of underwater welding: dry habitat and wet welding. An underwater enclosure is used for dry habitat welding, the use of which is required for slower cooling of high strength steels. A high-flow air system filters and exhausts the welding fumes and provides a safe atmosphere for the welder. In wet welding, operations are performed under submerged conditions. Specially coated welding rods allow the flux to bond with the wet surface. Before welding, the area is cleaned with scrapers, chipping hammers, or hand-held brushes. 11
, 13



### Sonar Dome Repair. Minor repairs to the exterior of rubber sonar domes can be accomplished by divers. The most common repair is patching the rubber window. A diver removes loose rubber, prepares the edges to receive a patch, and affixes a rubber patch with an amine polymer. 11



### Non-Destructive Test/Inspection. Underwater magnetic particle testing is used as a non-destructive inspection method to detect or define surface or near-surface cracks in ferrous metal structures prior to repair. It may also be used for welding quality assurance. An electromagnet is used to magnetize a localized area on the hull surface. A slurry of fluorescent iron flakes is then applied to the weld or crack with a squeeze bottle. These particles align with the defective area, facilitating inspection. 11
, 14



### Masker Belt Repairs. Masker emitter belts are installed at the forward end of the ship’s machinery spaces and run vertically down both sides of the external hull. The masker belt is a continuous length of copper-nickel pipe that emits air bubbles through small holes to mask ship noise. The pipe is epoxied into a fairing channel that is welded to the hull. The channel ensures

### Underwater Ship Husbandry 5 that the hull shape remains “fair,” or smoothly curved, so the masker belt does not protrude and increase drag. Waterborne repairs by divers consist of cutting away damaged belt sections and installing replacement sections. An insert is used to join the replacement with existing sections. Finally, an epoxy sealer is applied to ensure a positive air seal. 11



### Paint Operations. Underwater touchup painting is required after welding, shaft lamination repairs, and masker belt repairs. Touchup painting is also performed to repair paint damage or deterioration on surfaces such as rudders, dielectric shielding for the cathodic protection system, struts, and stern tubes. Epoxy paint is mixed on the surface (above water), supplied to the diver, and applied to the affected area with a brush or roller. 11



### SEAWOLF Propulsor Layup. The newly commissioned SEAWOLF attack submarine utilizes vinyl covers to prevent fouling of the propeller (also called propulsor) when it is in port for extended periods. The covers, referred to as the Propulsor Protective Covering System (PPCS), restrict sunlight and the supply of fresh nutrient-rich water into the propulsor. Reducing the amount of fouling that occurs on the propulsor in port reduces the need for underwater cleaning of the propulsor. 2



### 2.2 Releases to the Environment

2.2.1 Underwater Hull Cleaning
Underwater hull cleaning is accomplished by divers operating hand-held rotary brush units, self-propelled multi-brush cleaning vehicles, water jets, and hand-held scrapers. 4 

### These tools sweep or dislodge biofouling from the wetted surface of the hull and appendages. 1 

### The discharge from the cleaning process consists of seawater (from the impeller of the cleaning vehicle), living and dead marine organisms, and antifouling paint. 10 

### Variables affecting the amount of this discharge include hull surface area, condition of the paint system, degree of fouling, brush selection, conditions in the water, and the skill of the operators.

2.2.2 Other Underwater Repair, Maintenance, And Inspection Processes
Fiberglass Repair. A two component system consisting of an epoxy resin and a hardener is mixed topside and transferred to the underwater habitat to accomplish the fiberglass repairs. 15 

### Due to the rapid curing time of the resin system, it is applied to the surface to be repaired soon after mixing, and then covered with glass tape. Releases of fiberglass and resin can occur when materials fall through the open bottom of the enclosure. 11 

### Since the resin being applied quickly solidifies, any releases from the enclosure will fall to the bottom of the harbor.
Welding. Small amounts of welding consumables can enter the marine environment upon entry into or exit from the dry welding habitat, or by passing directly into the water during wet welding. 11 

### Slag, which is molten refuse material from the welding process, may fall from the welding area into the water column. Some spent welding rods and welding gases may also be released.

### Underwater Ship Husbandry 6 Sonar Dome Repair. When the diver removes the loose rubber from the sonar dome and affixes a rubber patch with adhesive, a discharge of solid rubber waste and/or adhesive may result. 11



### Non-Destructive Test/Inspection. The slurry of iron flakes applied to the weld is discharged directly into the water column. 11



### Masker Belt Repairs. Waterborne repairs consist of cutting away damaged belt sections and installing replacement sections as described in Section 2.1. 11 

### Portions of the damaged belt or some of the epoxy sealer can be released during this operation.
Paint Operations. While a diver is performing underwater touchup painting with epoxy coatings, some paint can be incidentally released into the water in the vicinity of the painting operation. 11 

### Neither the epoxy resin nor the amine compound of the primary products in use are water-soluble. 16



### SEAWOLF Propulsor Layup. Use of the PPCS creates a relatively isolated volume of water of approximately 21,000 gallons inside the propulsor. The chemistry of this volume of water can change over time, primarily due to the generation of small amounts of chlorine from the installed Impressed Current Cathodic Protection (ICCP) system and the decay of trapped organic matter. (Descriptions of the purpose and function of ICCP systems can be found in the Cathodic Protection NOD report). Releases to the environment resulting from the layup of the propulsor include decaying organic matter, chlorine, and Chlorine Produced Oxidants (CPO). CPO is used to describe the combination of oxidant species that may, in this case, be formed by the ICCP system in both primary and secondary reactions, and includes various chlorinated and brominated species. 17



### 2.3 Vessels Producing the Discharge
All Navy surface ships and submarines undergo periodic underwa ter ship husbandry. 1 

### However, the predominant discharge is from underwater hull cleanings. Underwater cleanings are performed on larger vessels between dry-docking periods. The Navy, with the greatest number of large vessels, produces this discharge more frequently than the other Armed Forces.The U.S. Coast Guard (USCG), Military Sealift Command (MSC), Army, and Air Force drydock their vessels more frequently, at which time hull cleaning is performed. 18
, 19
, 20 

### Small boats and craft are typically removed from the water for maintenance and repairs. 1 

### Layup of SEAWOLF Propulsors is currently limited to the SEAWOLF Class of attack submarines. The first of this class, SSN 21, was commissioned in the fall of 1997, with a total of 3 submarines planned. The next attack submarine class, commonly referred to as the “New Attack Submarine,” is also expected to use a PPCS type system.

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantit ative information that characterizes the

### Underwater Ship Husbandry 7discharge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

3.1 Locality
Underwater ship husbandry is conducted pierside. 1



### 3.2 Rate
Because of the variability in vessel surface area and in the volume of these releases for underwater ship husbandry, rates are discussed in terms of frequency of the event.

3.2.1 Underwater Hull Cleaning
On average, each Navy surface ship will receive five underwater hull cleanings every six years. 1 

### These statistics vary regionally depending on fouling rates, water temperatures, and the coating service life. Vessels in Pearl Harbor, HI, for example, would have higher fouling rates, and, therefore, a higher cleaning frequency than those in Norfolk, VA. An average of 136 full cleanings (including the hull surface, propeller, and shaft) are performed annually fleetwide, based on the following four years of data: 21



### 1993: 131 vessels 1994: 131 vessels 1995: 135 vessels 1996: 148 vessels
An additional 170 interim cleanings (i.e., the cleaning of propellers and shafts only) are estimated to occur each year. 1



### Although flow rates from the SCAMP have not been measured, based on impeller characteristics, motor speed, and expected efficiency, the flow rate has been estimated to be 13,500 gallons per minute (gpm), or 51,100 liters per minute (L/min). 10



### 3.2.2 Other Underwater Repair, Maintenance, and Inspection Processes
Table 1 lists the estimated releases from Navy underwater ship husbandry activities other than hull cleaning. 22 

### Coating shafts with fiberglass is performed on an infrequent basis. Sonar dome repairs are necessary only on submarines and surface combatants equipped with sonar equipment. The other listed activities apply to all vessels. Since the other services have fewer large ships than the Navy, these activities are expected to be less frequent among vessels of the other Armed Forces. For example, there have been three documented instances of underwater weld repairs conducted on MSC vessels in the past five years, and no rubber dome or fiberglass repairs. 23

### Underwater Ship Husbandry 8 Fiberglass Repair. On Navy vessels, fiberglass shaft coatings are estimated to be applied 12 times per year. Based on operational experience, it is estimated that approximately one quart of resin could possibly be released per fiberglass wrapping event. Given this amount, it is estimated that 12 quarts (11.4 liters) of the resin system (i.e., resin mixed with hardener) could possibly be released per year. 22



### Welding. Small amounts of welding consumables can enter the marine environment through the dry habitat or directly when wet welding is performed. 11 

### Slag and spent welding rods may also be released. From operational experience, it is estimated that approximately five pounds of slag or spent welding rod are discharged during each underwater welding operation, and approximately 12 of these operations are performed fleet-wide each year on Navy ships. 22 

### Metals from the welding operation will not be readily dissolved in the surrounding waters and will fall to the harbor floor.
Sonar Dome Repair. A discharge of solid rubber waste and/or adhesive can result from this operation. This is a site-specific operation, and this discharge is dependent on the size of the patch being repaired. It is estimated that 19 Navy surface ships and submarines undergo sonar dome repairs yearly. 22 

### Rubber pieces from the sonar dome repair operations will not be dissolved in the surrounding water and will settle on the harbor floor.
Non-Destructive Test/Inspection. During magnetic particle inspection, a slurry of iron flakes is discharged directly through the water column. It is estimated that 20 Navy vessels undergo magnetic particle inspections yearly. 22



### Masker Belt Repairs. Waterborne repairs consist of cutting away damaged belt sections and installing replacement sections. Based on operational experience, it is estimated that six Navy vessels undergo masker belt repairs yearly. 22 

### Releases can occur from the removal of the damaged belt and the application of the epoxy sealer. 11 

### Similar to the epoxy resin used in propeller shaft repair, the epoxy sealant will quickly solidify into a hard, insoluble material.
Paint Operations. While a diver is performing in-water touchup painting with epoxy coatings, some paint can be incidentally released into the water in the vicinity of the painting operation. It is estimated that roughly 60 operations of this type are performed on Navy vessels annually. 24 

### The surface area involved may be as small as two square feet for a weld touchup, or as large as 1,500 square feet when several areas of the ship require touchup painting. The amount of paint released will vary with the size of the area painted and the skill of the operator. 1 

### The release of material during these operations is accidental and highly variable.
SEAWOLF Propulsor Layup. Current operational procedures require the PPCS to be installed with 12 hours after entering port when the in port time is expected to be greater than 72 hours. 2 

### Exceptions to this requirement exist for maintenance and engine testing, during which the PPCS will be removed, or perhaps not installed at all. This is similar to the requirement for putting the main condensers of earlier submarine classes on a fresh water layup for which an estimate of 6 times per year was developed. 3

### Underwater Ship Husbandry 9 3.3 Constituents
Materials associated with underwater ship husbandry activities and which may be constituents of the various discharges are discussed in this section.

3.3.1 Underwater Hull Cleaning
The primary constituents found in the hull cleaning discharge are copper and zinc from the antifouling paint. These constituents are priority pollutants; neither are bioaccumulators. TBT is not a constituent of concern since small craft with aluminum hulls are not typically cleaned waterborne. 1



### 3.3.2 Other Underwater Repair, Maintenance, And Inspection Processes
The primary constituents which may be foun d in the discharge from underwater repair, maintenance, and inspection processes other than hull cleaning are listed in the following paragraphs. Constituents which are classified as bioaccumulators or priority pollutants are identified.
Fiberglass Repair. The primary constituents found in the discharge from fiberglass repair activities are proprietary resins and fiberglass. The resin material is fluid for only a short period of time; will not be dissolved in the surrounding water; and will fall to the harbor floor, where it will complete its curing. The hardener can contain triethylenetetramine; tetraethylenepentamine; 2,4,6-tris(dimethylaminomethyl)phenol; and amidoamine. 25



### Welding. The primary constituents found in the discharge from underwater welding are metals in the slag associated with welding rods. These may contain chromium, iron, nickel, beryllium, manganese, and trace quantities of other metals. 11 

### Chromium, nickel, and beryllium are priority pollutants.

Sonar Dome Repair. The primary constituents found in the sonar dome repair discharge are rubber from the patches and the sealant. The sealant adhesive contains epoxy resin, amine polymer, iron oxide, and silica. 11



### Non-Destructive Test/Inspection. The primary constituents found in the discharge from crack or weld inspection are fluorescent iron powder or flakes, water conditioner, and a surfactant mixture suspended in water. 26 

### The particles used are required by specification to be non-toxic, finely divided ferromagnetic material free from rust, grease, oil, paint, or other materials which can interfere with their proper functioning. 14



### Masker Belt Repairs. The primary constituents found in the discharge from masker belt repairs are portions of the damaged belt and adhesive. Sealant adhesive contains amine polymer, iron oxide, and silica. 11



### Paint Operations. The primary constituents found in the discharge from touchup paint

### Underwater Ship Husbandry 10 operations are epoxy paint which contains 4,4’-methylene dianiline, benzyl alcohol, and traces of epichlorohydrin. 11



### SEAWOLF Propulsor Layup. Constituents from the layup of the SEAWOLF propulsor will include decaying organic matter, and CPO that may build-up in the enclosed volume of the propulsor. CPO is the primary constituent.

3.4 Concentrations

3.4.1 Underwater Hull Cleaning
The Navy studied the environmental effects of in-water hull cleaning on six ships during the period from 1991-1993. Measurements of total copper were taken directly within the SCAMP discharge plume for three of these ships. 10 

### This data serves as the basis for the analysis of copper concentrations in and loading from the SCAMP effluent.
Table 2 summarizes both dissolved (0.45 micron filtered) and total (unfiltered) copper concentrations from the effluent of the SCAMP for the three ships. 10 

### Samples were collected in the plume created by the cleaning operation near the point of discharge, and thus are representative of the highest anticipated levels in the marine environment attributable to underwater hull cleaning. The mean for total copper in the samples ranged from 1,565 micrograms per liter ( μ g/L) to 2,619 μ g/L. The dissolved fraction was 4 to 9 percent of the total copper (66 μ g/L to 146 μ g/L). Zinc levels were not measured in this study, but can be roughly estimated from the original ratio of constituents in the paint. Assuming a ratio of 2.5 parts copper to 1 part zinc, it can be estimated that the total zinc concentration is 626 to 1,048 μ g/L. 27



### 3.4.2 SEAWOLF Propulsor Layup
The concentration of organic matter in the released volume of water will be related to the amount of biological matter in the harbor water when the PPCS is installed. The concentration of CPO will be proportional to the current output of the ICCP system and the length of time the PPCS is installed, and inversely proportional to the oxidizable component of the harbor water at the time of PPCS installation.
Typical in port ICCP system output for the SEAWOLF Propulsor is less than 1 ampere. An equation based on Faraday’s Law is used to determine the maximum CPO generation rate of 1.3 g Cl/hr.

Generation Rate of Chlorine Produced Oxidants (CPO)
= (1 amp) (1 coulomb/amp-sec) (3,600 sec/hr) (35.45 g chlorine/mole) (mole/96,484 coulomb)

= 1.323 g chlorine/hr ≈ 1.3 g/hr

### Underwater Ship Husbandry 11 Since ICCP systems (i.e., anode materials and system operating voltage) are designed to maximize cathodic protection provided to the hull, and generation of chlorine or CPO is a secondary reaction, actual CPO generation rates are expected to be significantly lower.
This generation rate of CPO will be further offset by the consumption of CPO in the harbor water. In the first stage of CPO decay, a portion of the CPO disappears within one minute, consumed by the instantaneous oxidant demand. This first decay is assumed to be a 25% reduction, based upon a range of values reported for studies performed in waters between 0 o 

### C and 33 o 

### C. 28
, 29 

### Following this, decay is assumed to occur at a rate of 50% concentration reduction per hour. While actual decay rates for CPO will vary significantly due to temperature, flow, and amount of biological matter, these average decay rates can be used to determine an estimate of the resultant CPO concentration and mass loading as shown in Calculation Sheet 1. 30 

### The resultant concentration and mass loading converge to steady-state values of 18 μg/L CPO and 1.4 g CPO per event, respectively, in the enclosed volume of water after ten hours of system operation.
One set of field was data obtained for this application, and in this, a CPO concentration of less than 40 μ g/L was measured in the enclosed water of the propulsor over a 52 day period. 31
, 32 

### This testing was accomplished in the context of local environmental limits for CPO of 0.2 ppm (200 μg/L), and test results only confirmed CPO concentrations within the lowest range of the test apparatus (0.0 ppm to 0.04 ppm) rather than precise values. 32 

### This is in agreement with the 18 μg/L estimated from the previous CPO decay calculation. The larger of the two estimates (40 μg/L) will be assumed for subsequent calculations.

3.4.3 Other Underwater Repair, Maintenance, and Inspection Processes
In accordance with the specifications, the concentration of magnetic particles in the slurry used for underwater weld inspection is between 0.1% and 0.7% by volume. 14 

### The remainder of the suspension is water. The estimated release amounts from other underwater ship husbandry activities are infrequent and in small quantities. In addition, these discharges are mostly insoluble and are unlikely to remain suspended in the water column or be dissolved. Pollutant concentrations resulting from fiberglass repair, welding, sonar dome repair, masker belt repair, and painting were not estimated.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presented in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. The estimated mass loadings are presented in Section 4.1. In Section 4.2, the concentrations of discharge constituentsare compared with water quality criteria. In Section 4.3, the potential for the transfer of nonindigenous species is discussed.

4.1 Mass Loadings

### Underwater Ship Husbandry 12 4.1.1 Underwater Hull Cleaning
Differences in ship assignments and deployments create different rates of hull fouling on individual vessels. However, the decision to initiate hull cleaning operations is based on visual inspection and by ship performance indicators as outlined in NSTM, Chapter 081. 4 

### Based upon this standard approach to assessing the need for cleaning, it is reasonable to assume that cleaning operations are initiated under similar fouling conditions. Therefore, the SCAMP discharges sampled are assumed to provide a reasonable basis for the approximation of SCAMP discharges fleet-wide. The total volume of a release from an underwater hull cleaning operation is proportional to the area of the hull cleaned. Therefore, the total volume of the discharge is related to the class of ship, with larger releases generated from the cleaning of larger hull areas.
For the purposes of calculating mass loading from ships and the fleet, the mean concentration of the copper in the SCAMP discharge from the three vessels studied was used. The total copper was measured to be 1,950 μ g/L and the dissolved copper fraction averaged approximately 107 μ g/L, or approximately 5.5%. 10



### In order to calculate the mass loading, data are needed on the flow rate (F) from the SCAMP impellers, and the rate (R), or area cleaned per unit time. The mass of copper released (Cu) per unit area cleaned (A) can be calculated by the following formula: 10



### Cu/A = (Cu concentration) (F/R) where Cu is in grams (g) A is in square meters (m 2 

### ) Cu concentration is in grams per liter (g/L) F is in liter s per minute (L/min) R is in square meters per minute (m 2 

### /min)

Using the following assumptions, a sample calculation of the mass of copper released per unit area cleaned is provided below:

SCAMP flow rate is 51,100 L/min (equivalent to 13,500 gpm), (Section 3.2) Cu concentration = 0.00195 g/L (mean concentration) Flow rate (F) = 51,100 L/min Cleaning rate (R) = 20.8 m 2 

### /min (225 ft 2 

### /min)

(based on 45 ft/min travel speed, and a 5 ft wide cleaned path) Cu/Area = (0.00195 g/L) (51,100 L/mi n) / (20.8 m 2 

### /min) Copper release = 4.8 g Cu per m 2 

### of surface cleaned

Assuming the entire hull area exposed to the water is cleaned, the wetted surface area of the ships can be used for the area cleaned. The wetted surface area of the ships was taken

### Underwater Ship Husbandry 13 directly from tables in NSTM Chapter 633, “Cathodic Protection,” or estimated by the following formula presented in the same source: 33



### S = 1.7(L)(d) + (V/d)

where: S = wetted surface area (ft 2 

### ) L = length between perpendiculars (ft) d = molded mea n draft at full displacement (ft) V = molded volume of displacement ft 3 

### (for seawater, 35 ft 3 

### of water per ton displacement)

As an example for an individual ship, from the NSTM the Spruance Class destroyer has a wetted hull area of 35,745 ft 2 

### (3,321 m 2 

### ). 33 

### Therefore, the mass loading is estimated to be 15.9 kilograms (kg), or 35 pounds (lbs) total copper released during a full hull cleaning.
Fleetwide Hull Cleanings. A list of Navy vessels which received full hull cleanings during the period from 1993-1996 was used to determine a weighted average mean hull surface area cleaned annually. 21 

### This weighted average was estimated to be 2,973 m 2 

### . The estimated copper release rate and the mean hull wetted surface area can be applied to all Navy ships to derive a total mass release fleet-wide. Dissolved copper releases are based on the average ratio (5.5%) of dissolved to total copper measured. 10



### Mean wetted hull area (all vessels) = 2,973 m 2 

### Approximate number of Navy vessels cleaned annually = 136 Total area cleaned annually = 404,328 m 2 

### (assuming full hull cleanings) Total copper release = (4.8 g/m 2 

### ) (404,328 m 2 

### ) = 1,941 kg/yr; or 4,279 lbs/yr Dissolved copper release = (1,941 kg/yr) (5.5%) = 108 kg/yr; or 238 lbs/yr

Since zinc was not measured in the Navy studies, it was assumed that releases from hull cleaning contain the same copper to zinc ratio (2.5:1) as is found in AF paint prior to its application. 27 

### The annual mass loading for zinc was estimated.

Total zinc release = (1,941 kg Cu/yr) / (2.5 (Cu/Zn ratio)) = 776 kg/yr; or 1,712 lbs/yr

4.1.2 SEAWOLF Propulsor Layup
Based on information previously provided, the annual mass loading of CPO due to the layup of the SEAWOLF propulsor is estimated to be a maximum of 19 g of chlorine.

### Underwater Ship Husbandry 14 Annual mass loading = (concentration)(volume per discharge)(number of discharges)

Maximum concentration = 40 μ g/L (see Section 3.4.2) Volume per discharge = 21,000 gal (3.785 L/gal) = 79,500 L Number of discharges per year = 6
Mass loading per event = 3.2 g CPO Maximum annual mass loading = 1.9 x 10 7 

### μ g, or 19 g CPO

4.1.3 Other Underwater Repair, Maintenance, And Inspection Processes
Based on the information presented in Section 3.2 and Table 1, the total discharges associated with underwater ship husbandry operations outside of underwater hull cleaning are as follows:

• 12 quarts of fiberglass resin released annually from shaft coa tings over the course of 12 events

• Approximately 60 pounds of welding consumables released annually, including spent welding rods and slag over 12 events
The estimated release amounts from other underwater ship husbandry activities are infrequent and in small quantities. In addition, these discharges are mostly insoluble and are unlikely to remain suspended in the water column or be dissolved.

4.2 Environmental Concentrations
Total copper has been measured in the effluent stream near hull cleaning operations at levels of approximately 1,600 to 2,600 μ 

### g/L. 10 

### These measured copper concentrations exceed water quality criteria (WQC) by three orders of magnitude. Dissolved copper in those same tests ranged from 66 to 146 μ 

### g/L, which is 28 to 61 times the Federal criterion for copper.
Using the compositional ratio of copper to zinc in antifouling paint, zinc concentrations in the release from underwater hull cleaning are estimated to be approximately 780 μ 

### g/L. This value exceeds WQC by one order of magnitude.
Table 3 shows Federal and most stringent state WQC relevant to the underwater ship husbandry discharge in comparison with the measured copper concentrations and estimated zinc concentrations from the SCAMP discharge.
For the SEAWOLF propulsor lay-up, most states have ambient WQC for CPO of 7.5 - 13 μ g/L. The sole measured concentration available reported the concentration as being between 0 and 40 μ g/L.

### Underwater Ship Husbandry 15 4.3 Potential for Introducing Non-Indigenous Species

Trans port of non-indigenous species on the hulls of commercial vessels has been documented. 34 

### Although the cleaning practices, frequency of transits, and operating locations differ for the Armed Forces, there is the potential for non-indigenous species to be transferred. Fouling and the presence of marine organisms is most serious around intakes, grates, and sea chests.

5.0 CONCLUSIONS
Underwater ship husbandry has the potential to cause an adverse environmental effect because measured concentrations of copper and estimated concentrations of zinc from underwater hull scrubbing exceed ambient water quality criteria and these constituents are discharged in significant amounts. The potential also exists for introducing non-indigenous species during hull cleaning.
Discharges from the other ship husbandry operations are infrequent, and are small in terms of volume or mass loading. Therefore, these discharges have a low potential for environmental effect.

6.0 REFERENCES
To characterize this discharge, infor mation from various sources was obtained, reviewed, and analyzed. Process information, engineering studies, and engineering analyses were used to estimate the rates of discharge and the concentrations of copper and zinc released to the environment. Table 4 shows the sources of data used to develop this NOD report.
Specific References

1

. UNDS Equipment Expert Meeting Minutes - Underwater Hull Husbandry, 22 October 1996.

2

. Wendel, A., Naval Sea Systems Command (SEA 03Z52), UNDS Equipment Expert Meeting Structured Questions, “Chlorine Produced from SEAWOLF Propulsor,” 8 December 1997.

3

. McFarland, L., SUBLANT. Freshwater Layup, Submarine Main Steam Condensers. Personal Communication. Miller, R.B., M. Rosenblatt & Son, Inc., 7 January 1997.

4

. Naval Ships’ Technical Manual (NSTM) Chapter 081, Waterborne Underwater Hull Cleaning of Navy Ships . 4 August, 1997.

5

. NAVSEA Standard Work Item (SWI 009-32) FY-98, Cleaning and Painting Requirements.

### Underwater Ship Husbandry 166. Qualified Products List of Qualified Products Under Military Specification MIL-PRF24647 Paint System, Anticorrosive and Antifouling, Ships Hull. QPL-24647-3, 2 April 1996.
7. Military Specification, MIL-PRF-24647B, “Paint System, Anticorrosive and Antifouling, Ship Hull,” August 1994.

8

. 

### UNDS Equipment Expert Meeting Minutes - Hull Coating Leachate Discharge, M. Rosenblatt & Son, Inc., 20 August 1996,
9. Naval Ships’ Technical Manual (NSTM) Chapter 631, Preservation of Ships in Service, Volume 3, Section 8. 1 November 1992.
10. The Naval Command, Control, and Ocean Surveillance Center, RDT&E Division, Marine Environmental Support Office, San Diego, California. “UNDS Underwater Hull Husbandry Evaluation: In-Water Hull Cleaning.” 13 February 1997.
11. Naval Sea Systems Command Code 00C, Underwater Ship Husbandry: Compilation of Summary Sheets and Material Safety Data Sheets for the UNDS Program, 1997.
12. Military Standard for “Glass Reinforced Plastic Coverings for Propeller Shafting,” MILSTD-2199, 11 May 1990.
13. Naval Ships’ Technical Manual (NSTM) Chapter 074, Volume 1, Section 6.1-6.9.4.3, Welding and Allied Processes, 15 June 1995.
14. Military Standard for “Requirements for Non-Destructive Testing Methods”, MIL-STD271F(SH), 27 June 1986.
15. Rosner, LCDR J., Naval Sea Systems Command, Code SEA 00C. Information on Fiberglass Repair Processes, Personal communication, K. Thomas, M. Rosenblatt and Son, Inc., 19 February 1998.
16. Material Safety Data Sheets for U.S. Technologies Limited Hycote 461 Epoxy Resin Fairing Compound, Hycote 461 Curing Agent, Hycote 151 Epoxy Resin (November 1990), and Hycote 151 Curing Agent (December 1991).
17. White, G.C. The Handbook of Chlorination and Alternative Disinfectants. New York, Van Nostrand Reinhold, 1992, p.1308.
18. Aivalotis, J., USCG, Use of TBT on USCG Ships, L. Panek, Versar, Inc., 28 May 1997.
19. Welling, J., Army. “Hull Cleaning Practices of the Army,” Personal communication, M. DiValentin, Naval Sea Systems Command, SEA 03L, 2 June 1997.
20. UNDS Ship Database, August 1, 1997.

### Underwater Ship Husbandry 17 21

. Na val Sea Systems Command, SEA 00C. Computer Assisted Information Retrieval System (CAIRS) Underwater Ship Husbandry Database Retrieval, September 1997.

22

. Dean, M., Naval Sea Systems Command, SEA 00C. Memorandum to M. Wenzel, NSWCCD Code 632, 10 April 1996.

23

. Weersing, P., Military Sealift Command. Underwater Ship Husbandry Activities of the MSC, Personal communication to UNDS file. 16 April 1997.

24

. Naval Sea Systems Command, SEA 00C. Underwater Ship Husbandry Paint Operations Data from May 1996 through August 1997.

25

. Material Safety Data Sheet for ITW Philadelphia Resins, PHILLYCLAD 1775/620TS Resin, 7 October 1996.

26

. Material Safety Data Sheet for Circle Systems, Inc. Mi-Glow Underwater 1, May 1995.

27

. Material Safety Data Sheet for Courtaulds BRA 640 Interviron Red Antifouling Paint, March 1996.

28

. Davis, M.H. and J. Coughlan. “A Model for Predicting Chlorine Concentrations within Marine Cooling Circuits and its Dissipation at Outfalls,” in Water Chlorination: Environmental Impact and Health Effects, Vol. 4, Book 1, Eds. Jolley, R.L. et al., Ann Arbor Science, 1983.

29

. Naval Sea Systems Command, SEA 03L. Chlorination Report, Malcolm Pirnie, Inc., 14 July 1997.

30

. Thomann, R. V. and J. A. Mueller. Principles of Surface Water Quality Modeling and Control . Harper Collins Publishers, New York, NY. 1987. pp. 180-185.

31

. Electric Boat Corporation, Supplemental Information Relative to SEAWOLF Propulsor NOD, Alan Wendel, Naval Sea Systems Command, 16 December 1997.

32

. Ele ctric Boat Corporation, “SEAWOLF PPCS/ICCP System Compatibility” Draft Engineering Report, 10 June 1998.

33

. Naval Ships’ Technical Manual (NSTM) Chapter 633, Section 4.3.1 and Table 633-5. Cathodic Protection . 1 August 1992.

34

. Ruiz, Greg. Non-Indigenous Species Presentation - Notes by Dan G. Mosher, Malcolm Pirnie, Inc. 18 September 1996.

General References

### Underwater Ship Husbandry 18 USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.
Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).
Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.

### Underwater Ship Husbandry 19 The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, pg. 15366. March 23, 1995.

### Underwater Ship Husbandry 20 Table 1 - Releases Associated with Underwater Ship Husbandry on Navy Vessels (Exclusive of Hull Cleaning ) 22



### Operation Material Released Quantity Released per Event Events per Year

Underwater Fiberglass Repair fiberglass resin 1 quart 12

Underwater Welding epoxy paint, welding consumable, slag 5 lbs. (welding consumables) 12

Rubber Sonar Dome or Sub Tile Repair rubber sealant, epoxy minimal 16 (surface ships) 3 (submarines) Non-Destructive Testing iron flakes, dye, surfactant minimal 20

Masker Belt Repairs epoxy paint and filler; rubber sealant minimal 6

Paint Operations Underwater/Waterline epoxy paint minimal 60

Propulsor Protective Covering System (PPCS) chlorine produced oxidants (CPO) 3.2 g 6

Table 2 - Total And Dissolved Copper Concentrations From In-Water Hull Cleaning Effluent Generated By SCAMP 10

Vessel Name Cu, μ g/L (Filtered) % Dissolved Cu, μ g/L (Unfiltered) USS Fort Fisher (LSD 40) 66 4 1,668

USS Tuscaloosa (LST 1187) 141 1,475 146 1,520 137 1,600 125 1,597 135 1,633

mean: 136.8 8.7 1,565 standard deviation: +/- 7.0 +/- 58.3
USS Ranger (CV 61) 106 2,499 116 2,503 118 3,287 120 2,441 124 2,362

mean: 116.8 4.5 2,619 standard deviation: +/- 6.0 +/- 338 Grand Mean: 106.5 5.5 1950 standard deviation: 29.8 474

### Underwater Ship Husbandry 21 Table 3. Comparison of Constituent Concentrations with Water Quality Criteria ( μ g/L)

Constituent Concentration Federal Acute WQC Most Stringent State Acute WQC Copper (total) 1950 2.9 2.5 (WA) Copper (dissolved) 107 2.4 2.4 (CT, MS)

Zinc (total) 780 95.1 84.6 (WA) CPO 0 - 40

- 10 (FL)
Notes: Refer to federal criteria promulgated by EPA in its National Toxics Rule, 40 CFR 131.36 (57 FR 60848; Dec. 22, 1992 and 60 FR 22230; May 4, 1995)

CT = Connecticut FL = Florida MS = Mississippi WA = Washington



### Table 4. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents MSDS X 3.4 Concentrations X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### Underwater Ship Husbandry 22 Chlorine Produced Oxidants (CPO) generation rate (R) = 1.3 g/hr PPCS volume (V) = 21,000 gal (3.785 L/gal) = 79,485 L

C 0 

### = concentration after first minute (considered “time zero” due to first stage decay) = [(1.3 g/hr) (0.75) (10 6 

### μ g/g)] / (79,485 L) = 12.3 μ g/L C t 

### = concentration at a given time (t) C t 

### = C 0 

### e (-kt) 

### , where k = decay constant ln (C t 

### /C 0 

### ) = ln (e (-kt) 

### ) = -kt For t = 1 hr and C 0 

### = 12.3 μ g/L, Ct = (12.3 μ g/L) (50%) = 6.15 μ g/L ln (C t 

### /C 0 

### ) = ln (12.3/6.15) = ln (0.5) = -0.693 = -kt k = - (-0.693) / (1 hr) = 0.693 / hr C t 

### = C 0 

### e (-kt) 

### = (12.3 μ g/L) e (0.693t)



### However, since CPO is generated simultaneously with the decay of previously introduced CPO, a steady state concentration will be reached when the decay rate equals the generation rate, which can be expressed as: 30



### k(C ss 

### V) = 0.75R k = decay constant (h r -1 

### ) C ss 

### V = (steady state CPO concentration) (volume) = mass (g) R = generation rate (g/hr)

C ss 

### = 0.75R / (kV) C ss 

### = 17.7 μ g/L
Mass = 1.4 g CPO/event or 8.4 g CPO/yr

Calculation Sheet 1. CPO Concentration and Mass from SEAWOLF Propulsor Layup

### Underwater Ship Husbandry MPCD Analysis 1 UNDERWATER SHIP HUSBANDRY MARINE POLLUTION CONTROL DEVICE (MPCD) ANALYSIS

Several alternatives were investigated to determine if any reasonable and practicable MPCDs exist or could be developed for controlling discharges from underwater ship husbandry activities. An MPCD is defined as any equipment or management practice, for installation or use onboard a vessel, designed to receive, retain, treat, control, or eliminate a discharge incidental to the normal operation of a vessel. Phase I of UNDS requires several factors to be considered when determining which discharges should be controlled by MPCDs. These include the practicability, operational impact, and cost of an MPCD. During Phase I of UNDS, an MPCD option was deemed reasonable and practicable even if the analysis showed it was reasonable and practicable only for a limited number of vessels or vessel classes, or only on new construction vessels. Therefore, every possible MPCD alternative was not evaluated. A more detailed evaluation of MPCD alternatives will be conducted during Phase II of UNDS when determining the performance requirements for MPCDs. This Phase II analysis will not be limited to the MPCDs described below and may consider additional MPCD options.
MPCD Options
Underwater ship husbandry activities include inspecting, grooming, maintaining, and repairing hulls and hull appendages while a vessel is waterborne. 1 

### Underwater hull cleaning is, by far, the most common underwater ship husbandry process and has the highest potential for environmental impact. Underwater hull cleaning is performed for numerous reasons including fuel savings, extending service life of hull coatings, and extending the interval between dry dockings and associated coating replacement. To determine the practicability of mitigating the potentially adverse environmental effects of these activities, three potential MPCD options were investigated. The purpose of these MPCDs would be to reduce or eliminate the release of antifouling agents, specifically copper and zinc, into surrounding waters during underwater hull cleaning operations. The MPCD options were selected based on initial screenings of alternate materials, equipment, pollution prevention options, and management practices. They are listed below with brief descriptions of each:
Option 1: Vary hull cleaning brush type and brush pressure - The goal of this option would be to more closely match brush stiffness and pressure to the degree of fouling to minimize antifouling coating removal. More brush types would be developed, and several different brush types may be used and interchanged during the cleaning of any one vessel. By properly selecting brushes, effective cleaning can be conducted with a minimal release of antifouling agents and associated discharges.

### Underwater Ship Husbandry MPCD Analysis 2 Option 2: Mandate the maximum allowable frequency of underwater hull cleaning - This option would reduce the number of hull cleanings permissible within a given time period or at any one location to limit the amount of discharge within each harbor.
Option 3: Collect water discharged from the multi-brush cleaning vehicle - This option would provide a means to collect the discharge from the underwater hull cleaning vehicles to prevent water that contains antifouling agents from entering the surrounding environment.
MPCD Analysis Results
Table 1 shows the findings of the investigation of the selected MPCD options. It contains information on the elements of practicability, effect on operational and warfighting capabilities, cost, environmental effectiveness, and a final determination for each option. Based on these findings, Option 1 -- varying hull cleaning brush type and brush pressure -- offers the best combination of these elements and is considered to represent a reasonable and practicable MPCD.

### Underwater Ship Husbandry MPCD Analysis 3 Table 1. MPCD Option Analysis and Determination

MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

Option 1. Vary Hull Cleaning Brush Type & Brush Pressure New brush types would have to be developed so they could more closely match the hull fouling condition. Monitoring and controlling brush pressure and aggressiveness would further enhance cleaning procedures. Using different cleaning brushes should not reduce vessel capabilities as hulls would still be required to be cleaned to current standards. However, interchanging brush types will potentially increase cleaning time, thereby slightly decreasing vessel availability. Cleaning costs will likely increase if the brushes have to be switched more frequently or if the discharge has to be monitored. Additional costs associated with development of new brushes would be incurred. 2 

### Varying brush type and pressure will reduce copper and zinc mass loading due to a reduction in brush aggressiveness by an estimated 10% to 20% depending on the age and type of antifouling coating system. 1 

### Developing and manufacturing new brushes: 1) can be implemented, 2) is cost effective, and 3) will reduce mass loading. Therefore, this MPCD option warrants further consideration.

Option 2. Mandate the maximum allowable frequency of underwater hull cleaning Pre-cleaning inspections are currently performed and compared to hull cleaning criteria to prevent unwarranted hull cleanings. Any further prohibitions on cleaning frequency could potentially negate the benefits of hull cleaning. 3 

### Reducing the frequency of hull cleanings would increase hull fouling causing increased fuel consumption, decreased maximum vessel speed, and increased acoustic signature, and, therefore, adversely affect vessel mobility and readiness. Reducing cleaning frequency will increase annual fuel costs by up to $75,000 for a typical cruiser. 4
, 5 

### Although reducing the number of cleaning events may reduce total load, the increased aggressiveness required to clean a more heavily fouled hull could result in equal or greater total discharge. This option may necessitate more frequent paintings. Newly applied coatings have been shown to have much higher copper release rates than old coatings, so the more ships with newer coatings could increase loadings. This option results in a performance penalty and increased fuel costs with questionable environmental benefit.

Option 3. Collect Water Discharged From the Multi-Brush Cleaning Vehicle Installing discharge hoses on existing cleaning units does not seem to be possible due to the Collecting effluent during cleaning operations will increase cleaning time, resulting in reduced vessel If this option is proven to be feasible, there would be higher costs associated with: 1) technology A new hull cleaning device has the potential to reduce mass loading of copper and zinc by 100% if Although this option would eliminate the discharge, if the new hull cleaning device proves to be

### Underwater Ship Husbandry MPCD Analysis 4 MPCD Option Practicability Effect on Operational & Warfighting Capabilities Cost Environmental Effectiveness Determination

diameter of the hose required, the expected flow rate, and the head required to discharge to the pier. Operating such a device could compromise diver mobility and safety. Alternatively, a new hull cleaning device that would collect cleaning effluent is in early stages of development and the practicability of this device has yet to be determined. This effort is several years away from completion. availability. If cleaning effectiveness is reduced, this would adversely affect acoustic signature, fuel consumption, vessel speed, and vessel mobility. development, 2) increased cleaning time, and 3) waste treatment and disposal. no discharge escapes collection during cleaning operations. successful, this may become a viable alternative. Adapting a collection system to the current diver-based technology is not feasible.

### Underwater Ship Husbandry MPCD Analysis 5 REFERENCES

1 

### Equipment Expert Meeting Minutes, Underwater Hull Husbandry, 22 October 1996.

2 

### McCue, T. (NAVSEA Code 00C). Personal communication with K. Thomas. Estimate of Cleaning Brush Costs based on previous R&D of same. 1997

3 

### Naval Ships’ Technical Manual S9086-CQ-STM-010 R3 Chapter 081, Waterborne Underwater Hull Cleaning of Navy Ships. 4 August 1997.

4 

### Hundley, L. L. and Tate, C. W., Sr. (David W. Taylor Naval Ship Research and Development Center). “Hull Studies and Ship Powering Trial Results of Seven FF 1052 Class Ships,” DTNSRDC-80/027. March 1980.

5 

### Naval Petroleum Office Instruction. July 1997.

### Welldeck Discharges 1 

## NATURE OF DISCHARGE REPORT

1.0 INTRODUCTION

The National Defense Authorization Act of 1996 amended Section 312 of the Federal Water Pollution Control Act (also known as the Clean Water Act (CWA)) to require that the Secretary of Defense and the Administrator of the Environmental Protection Agency (EPA) develop uniform national discharge standards (UNDS) for vessels of the Armed Forces for

“ ...discharges, other than sewage, incidental to normal operation of a vessel of the Armed Forces,

... ” [Section 312(n)(1)]. UNDS is being developed in three phases. The first phase (which this report supports), will determine which discharges will be required to be controlled by marine pollution control devices (MPCDs)

— either equipment or management practices. The second phase will develop MPCD performance standards. The final phase will determine the design, construction, installation, and use of MPCDs.
A nature of discharge (NOD) report has been prepared for each of the discharges that has been identified as a candidate for regulation under UNDS. The NOD reports were developed based on information obtained from the technical community within the Navy and other branches of the Armed Forces with vessels potentially subject to UNDS, from information available in existing technical reports and documentation, and, when required, from data obtained from discharge samples that were collected under the UNDS program.
The purpose of the NOD report is to describe the discharge in detail, including the system that produces the discharge, the equipment involved, the constituents released to the environment, and the current practice, if any, to prevent or minimize environmental effects. Where existing process information is insufficient to characterize the discharge, the NOD report provides the results of additional sampling or other data gathered on the discharge. Based on the above information, the NOD report describes how the estimated constituent concentrations and mass loading to the environment were determined. Finally, the NOD report assesses the potential for environmental effect. The NOD report contains sections on: Discharge Description, Discharge Characteristics, Nature of Discharge Analysis, Conclusions, and Data Sources and References. Welldeck Discharges

### Welldeck Discharges 2 2.0 DISCHARGE DESCRIPTION
This section describes the welldeck discharges and includes information on the equipment that is used and its operation (Section 2.1), general description of the constituents of the discharge (Section 2.2), and the vessels that produce this discharge (Section 2.3).

2.1 Equipment Description and Operation
Several Navy ship classes have a welldeck in the aft section of the ship for embarking, storing, and disembarking landing craft. These welldecks range from 50 to 78 feet in width, 168 to 440 feet in length, and 20 to 30 feet in height. 1 

### During an amphibious operation or beach assault, the ship can be positioned anywhere within proximity of land. However, the operations are more likely to occur near the 12 nautical mile (n.m.) limit so the ship is less susceptible to enemy gunfire from shore. The landing craft carried onboard the ship serve to ferry U. S. Marine Corps (USMC) personnel, vehicles, and equipment to and from shore. Depending on the type of landing craft used, the ship might fill ballast tanks with seawater to lower the ship so that the welldeck floods with water (see Figure 1).
The types of craft that typically operate from these ships are utility landing craft (LCUs), air-cushion landing craft (LCACs), and assault amphibian vehicles (AAVs). LCUs have diesel engines to power the propellers. LCACs are gas-turbine-driven hovercraft. AAVs propel themselves through the water with waterjets, but use tracked running gear on land. Although AAVs can enter and exit the welldeck independently, they are also carried onboard LCUs and LCACs. Mechanized landing craft (LCM), once common to amphibious operations, are no longer carried by amphibious ships. 1,2



### Vehicles and equipment are stored in the vehicle storage areas forward of the welldeck. These areas are located on two levels and are connected by ramps. Vehicles and equipment are also stored onboard the LCUs and LCACs in the welldeck but not in the welldeck itself due to space constraints. Similarly, containers and products are not stored in the welldeck but rather in the vehicle storage areas or elsewhere on the ship. Examples of the vehicles carried onboard include light armored vehicles (LAVs), AAVs, tanks, jeeps, trucks, high mobility multipurpose wheeled vehicles (HMMWVs), and motorcycles. Examples of equipment carried onboard include howitzers and trailers. 2



### The floors of the welldeck are lined with pressure treated lumber. The walls are lined with either pressure treated lumber or synthetic batter boards except near the stern gate where the walls are lined with rubber panels.
Vehicle and equipment maintenance is performed where the vehicles and equipment are stored, which can include on the deck of a host LCU or LCAC. Waste products and spills produced during vehicle maintenance are collected and held in accordance with shipboard procedures for spill containment. Oily patches on the decks are cleaned with a detergent. 2



### There are five primary overboard discharges from a welldeck: (1) washout from the

### Welldeck Discharges 3 welldeck when the ship ballasts to embark or disembark landing craft; (2) water or detergent and water mixture used for LCAC gas turbine engine washes; (3) graywater and condensate that can be discharged from the LCUs; (4) freshwater wash to remove salt and dirt from vehicles, equipment, and landing craft; and (5) U.S. Department of Agriculture (USDA) washes of the welldeck, vehicle storage areas, and all vehicles, equipment, and landing craft. These discharges can occur almost anywhere within 12 n.m., except for the USDA work which occurs pierside.

2.1.1 Welldeck Washout
Washout occurs when the welldeck is flooded to allow landing craft to enter or exit the ship. However, LCACs and AAVs do not need the welldeck to be flooded to enter or exit, although some water will naturally enter. Therefore, this discussion is primarily applicable to LCU operations. The ship submerges the welldeck by flooding clean ballast tanks with seawater. 3 

### See Figure 1. When the welldeck is submerged, any debris or fluid in the welldeck is mixed with the seawater and will eventually flow to the open sea.

2.1.2 LCAC Engine Washes
The LCAC engine washes are performed on the four gas turbine engines provided for propulsion and the two auxiliary power units (APUs) provided to supply electrical power. There are two types of LCAC engine washes: thorough preventive-maintenance washes that uses a detergent to remove engine deposits and those performed daily with only distilled water to remove salt deposits. During winter conditions, methanol may be added to the mixture to prevent the wash water from freezing. 4



### Preventive-maintenance washes are scheduled every 25 operating hours for the gas turbines and quarterly for the APUs. Because the purpose of these washes is to prevent engine degradation, any noticeable reduction in engine performance will usually result in a wash. There are currently two separate methods used to perform these washes but both involve flushing distilled water and detergent through the engine while it is being rotated on the starter. One method uses an automated cleaning system, if installed, and a detergent called ZOK-27. The other, a more manual procedure, uses a detergent called B&B 3100 (MIL-C-85704). Following the detergent wash, a separate distilled water wash is performed to flush out the engine. APUs are washed in a similar way except that the detergent is Stoddard Solvent, FedSpec P-D-680, type III. 2,3



### Daily washes are performed when the LCACs have been operating, but not if preventive maintenance washes are scheduled for the same day. This wash consists of a rinse of distilled water through the propulsion gas turbines, but not the APUs. However, if a cleaning system is installed it may also be used for the daily wash as it is for the preventive maintenance wash.

2.1.3 Landing Craft Discharges
LCU crews live aboard their craft in the welldeck. As such, they generate graywater (i.e., water from drains, sinks, and showers) as well as condensate from air conditioning systems. The

### Welldeck Discharges 4 graywater and condensate produced is drained to the welldeck. LCUs do not create blackwater (sewage) because the crew uses the ship ’ s sanitary facilities. 3 

### LCACs do not have living spaces, do not produce graywater, and do not discharge condensate into the welldeck. 2 

### For more information on graywater, see the Graywater NOD Report.

2.1.4 Vehicle, Equipment, and Landing Craft Washes
Dirty vehicles and equipment returning to the ship are washed ashore, if possible. They also will receive a freshwater wash on the ramp leading from the welldeck to the vehicle storage area. The engine compartments are not washed. 2 

### The wash water flows into the welldeck and is drained overboard or pumped overboard by an eductor. The motive water for the eductors in the welldeck and vehicle storage areas is provided by the firemain.
The aluminum structure of an LCAC is unpainted and susceptible to the corrosive effects of seawater. To prevent this corrosion, the exterior is washed with fresh water at the conclusion of daily operations. If the LCACs are not being used, a biweekly wash is required. 5 

### No cleaners or detergents are used for these washes. LCUs and AAVs are not washed in the welldeck.

2.1.5 USDA Washes and Inspections
The USDA requires that vehicles, equipment, craft, and internal shipboard areas that havecontacted foreign soil be thoroughly washed and inspected to prevent the importation of nonindigenous species. These washes and inspections are performed prior to returning to, or upon return to, the U.S. These washes and inspections fall into three categories; those done on the welldeck and vehicle storage areas, those done on the vehicles and equipment, and those done on the landing craft. These three operations normally occur in foreign ports, but can occur in the U.S. or U.S. territories. 2



### The welldeck and vehicle storage areas are washed when all of the vehicles, equipment, and landing craft that can be off-loaded are removed. Those that remain are too large to fit down the exit ramp on the side of the ship. Their normal path is through the stern gate. One example is the M-9 armored combat earthmover (ACE) which is 10.5 feet wide and 8.75 feet high. During the washes all surfaces (decks, bulkheads, and overheads) are cleaned. The process for the welldeck begins with a seawater wash of all surfaces followed by a freshwater wash. Unlike the welldeck, the vehicle storage areas are only washed with fresh water. Following the washes, the USDA inspects to ensure that no foreign species, soil, or plants are in those areas. All of the water effluent drains overboard or is pumped overboard by an eductor. 2



### The vehicles and equipment are washed pierside, except for those discussed above that cannot be off-loaded. They will be washed and inspected in the welldeck. The process begins with the vehicles and equipment being parked in a designated contaminated area. Each, in turn, is then moved to an area to have the interior cleaned. They are then moved to the wash racks and thoroughly washed (including the engine compartments) with fresh water. The wash racks are long wheel ramps that allow the undersides of the vehicles to be washed and inspected. Following the wash, each vehicle or piece of equipment is inspected by the USDA for foreign

### Welldeck Discharges 5 organisms, plants, and soil, and then moved to a designated clean area to await reloading on the ship. The effluent from the vehicles and equipment washed in the welldeck drains overboard or is pumped overboard by an eductor. 2



### The landing craft are also washed and inspected. LCACs, however, are not usually given a special wash because enough sea spray is created in their operation that all the exterior surfaces are flushed free of foreign organisms, plants, and soil before the LCAC boards the ship at sea and is inspected. LCUs are washed with fresh water in the welldeck or pierside and then inspected. 2



### 2.2 Releases to the Environment
Effluent is discharged to the environment by washout or surge when landing craft are operating in the welldeck. Effluent from the various washes performed in the welldeck are discharged as it drains overboard from the welldeck or is pumped overboard by an eductor.

Welldeck washout and the effluent from the washes can contain fresh water, distilled water, firemain water, graywater, air-conditioning condensate, sea-salt residues, paint chips, wood splinters, dirt, sand, organic debris, oil, grease, fuel, detergents, combustion by-products, and lumber treatment chemicals.

2.3 Vessels Producing the Discharge
Only the Navy has ship s with welldecks. Ship classes with welldecks include general purpose amphibious assault ships (LHAs), multipurpose amphibious assault ships (LHDs), amphibious transport docks (LPDs), and dock landing ships (LSDs). While there are differences among welldeck designs, the primary process variance is due to the type and number of landing craft onboard. Applicable data is listed below. 1



### Ship No. of Welldeck Landing Craft Class Ships Dimensions Loading Schemes

LHA 1 5 268 ’ x 78 ’ 4 LCU , 1 LCAC, or 45 AAV LHD 1 4 267 ’ x 50 ’ 3 LCAC or 2 LCU LPD 4 8 168 ’ x 50 ’ 1 LCU or 28 AAV LSD 36 5 430 ’ x 50 ’ 4 LCAC, 3 LCU, or 52 AAV LSD 41 8 440 ’ x 50 ’ 4 LCAC, 3 LCU, or 64 AAV LSD 49 3 265 ’ x 50 ’ 2 LCAC or 1 LCU

3.0 DISCHARGE CHARACTERISTICS
This section contains qualitative and quantitative information that characterizes thedischarge. Section 3.1 describes where the discharge occurs with respect to harbors and nearshore areas, Section 3.2 describes the rate of the discharge, Section 3.3 lists the constituents in the discharge, and Section 3.4 gives the concentrations of the constituents in the discharge.

### Welldeck Discharges 6 3.1 Locality
Welldeck discharges can occur both within and beyond 12 n.m.

3.2 Rate

3.2.1 Welldeck Washouts

The flow from a welldeck washout can be estimated based on the welldeck dimensions listed in Section 2.3. The washout volume was estimated by multiplying the dimensions of the welldeck (length and width in feet) by the approximate height of water needed by an LCU (5 ’ 2 

### The numbers shown in parenthesis are estimated values for the amount of water entering the welldeck during LCAC operations (using an assumed depth of 4 inches of water spread uniformly across the welldeck). The water in the welldeck during LCAC operations is the result of the surge created when the LCACs enter the ship and is not the result of ballasting.
Ship Class Estimated Gallons Per Washout (or Surge)

LHA 1 1,100,000 (52,000) LHD 1 700,000 (33,000) LPD 4 440,000 (0, no LCACs) LSD 36 1,130,000 (54,000) LSD 41 1,150,000 (55,000) LSD 49 700,000 (33,000)
On average, an amphibious ship will have one six-month deployment every two years. During such a deployment, ballasting/deballasting will take place approximately 40 times (unless LCACs are deployed in which case the seawater surge will enter the welldeck 40 times). 2 

### It is variable how many times the ballasting/surge will take place within U.S. waters or how many local exercises will take place during that two year period. This is because the amount of time that a ship spends in U.S. waters varies from ship to ship.

3.2.2 LCAC Gas Turbine Engine Washes
Approximately 12 gallons of distilled water is used for a propulsion gas turbine daily wash. The flow from a detergent wash would be 12.5 gallons of distilled water/detergent mix followed by 12 gallons of distilled water rinse for a total of 24.5 gallons. For each APU, the flow from a detergent wash would be 0.375 gallon of distilled-water-detergent mix followed by a 0.25 gallon distilled water rinse for a total of 0.625 gallon. Thus, each LCAC is capable of producing 48 gallons of effluent from the daily washes of the four propulsion gas turbines and 99.25 gallonsof effluent if all of the engines (four propulsion and two APUs) are washed with a waterdetergent mix. 2,6

### Welldeck Discharges 7 3.2.3 Graywater and Air Conditioning Condensate
LCUs discharge graywater into the welldeck because they do not have the capability to collect and hold graywater. Air-conditioning condensate is also not collected.
During the transit of an amphibious ship from port to 12 n.m., the LCU would have 4 hours to generate graywater. The rate of graywater generation for Navy personnel is given as 30 gallons per person per day. Thus, an LCU with a typical load of six crew members could generate 180 gallons of graywater per day or 30 gallons of graywater during the 4-hour transit period. However, little or no graywater is produced and discharged within 12 n.m. because the crew of the LCU is occupied with preparations for, or stand down from, welldeck operations.
The generation of graywater on an LCU while the host ship is operating within 12 n.m. has not been estimated since the time that a host ship will be operating within 12 n.m. varies. LCU air-conditioning capacity varies from 5 to 8 tons which, under severe heat and humidity conditions, can produce 30 to 48 gallons of condensate per day.

3.2.4 Vehicle, Equipment, and Landing Craft Washes
When returning to th e ship, vehicles and equipment receive a freshwater wash on the ramp leading from the welldeck to the vehicle storage area. This freshwater wash uses a 1.5-inch firehose at a rate of about 95 gallons per minute (gpm). 2 

### The wash typically takes 30 seconds, so it is estimated that 48 gallons of fresh water is used per wash. A typical ship contains about 100 to 125 vehicles and pieces of equipment, so approximately 4,800 to 6,000 gallons could be discharged if all of the vehicles and equipment are returned to the ship and washed consecutively.
The exterior wash of the LCACs is performed at the end of daily operations. This wash also uses a 1.5-inch firehose at a rate of 95 gpm and lasts for about 10 minutes. Estimates from LCAC personnel indicate that about 1,000 gallons of water are used per LCAC, which is consistent with a 10 minute wash at 95 gpm. 2 

### Since the number of LCACs carried onboard a ship can vary as shown in Section 2.3, 1,000 to 4,000 gallons of water could be released by these washes. However, if the LCACs are not being used, only a biweekly wash is required. 5



### 3.2.5 USDA Washes and Inspections
The welldeck and vehicle storage areas are washed differently. The welldeck is first washed with seawater via the firemain, and then washed with fresh water. The vehicle storage areas are only washed with fresh water. Each wash takes about 45 minutes. The seawater wash of the welldeck uses a 1.5-inch firehose at a rate of about 95 gpm of seawater. Based on the estimated time of 45 minutes, about 4,275 gallons are used. The freshwater wash of the welldeck also uses a 1.5-inch firehose at a rate of about 95 gpm. Again, based on the estimated time of 45 minutes, about 4,275 gallons are used. The upper and lower vehicle storage areas are washed separately with fresh water, each taking about 45 minutes, and using a 1.5-inch firehose at a rate of about 95 gpm. To summarize these estimates, 4,275 gallons of firemain water and 4,275 gallons of fresh water are used to wash the welldeck and 8,550 gallons of fresh water are used to

### Welldeck Discharges 8 wash both vehicle storage areas.
The vehicles and equipment are washed with a 1.5-inch firehose at a rate of about 95 gpm of fresh water. Each vehicle or piece of equipment takes about 5 minutes to wash. Therefore, about 475 gallons of water are used. If five to ten vehicles or pieces of equipment were unable to be off-loaded, 2,375 to 4,750 gallons of water could be used.
The duration of the landing craft washes for calculation purposes will be estimated at 15 minutes using a 1.5-inch firehose at rate of about 95 gpm of fresh water. Therefore, about 1,425 gallons could be used for each landing craft. The washing of the LCACs in this manner is unlikely however, so the loading of one to four LCUs (from Section 2.3) is used to yield a range of effluent produced which is 1,425 to 5,700 gallons.

3.3 Constituents
The potential constituents of this discharge include: 2,3



### • air-conditioning condensate

• automotive grease

• B&B 3100 detergent (MIL-C-85704)

• bromine (from the wash water)

• chlorine (from the wash water)

• detergent

• gas turbine fuel, JP-5 (MIL-F-5624E)

• graywater

• lumber-treatment chemicals

• methanol

• motor oils

• naval distillate fuel, F-76 (MIL-F-16884)

• nickel, copper, zinc, and other metals

• solvent P-D-680 type III (petroleum distillate)

• vehicle diesel fuel, F-34 (MIL-T-83133)

• ZOK-27 water-soluble detergent
ZOK-27 contains ethanol and 2-butoxyethanol, while B&B 3100 contains solvent-refined heavy naphthenic distillate and petroleum solvents. Marine diesel fuel (F-76) contains petroleum mid-distillates, antisetting agents, and flow improvers.
It is possible that lube oils, greases, and fuel oils can be spilled on welldeck surfaces. However, spills will be quickly wiped up in accordance with shipboard practices, so any oils or greases found on welldeck surfaces will exist as surface films. Such surface films may contain benzene, toluene, ethylbenzene, and xylenes which are the common constituents of lighter petroleum products. These chemicals are also priority pollutants, as are various metals (e.g., copper and nickel) which are in firemain water and could be present in greases, oils, and fuels. 7

### Welldeck Discharges 9 There are no constituents present in welldeck discharges that are bioaccumulators. 8



### 3.4 Concentrations

The constituent concentrations have not been estimated. The concentration of metals in the firemain water is discussed in the Firemain Systems NOD Report.

4.0 NATURE OF DISCHARGE ANALYSIS
Based on the discharge characteristics presente d in Section 3.0, the nature of the discharge and its potential impact on the environment can be evaluated. A discussion on the mass loadings is presented in Section 4.1. In Section 4.2, the concentrations of discharge constituents after release to the environment are discussed along with the water quality standards. In Section 4.3, the potential for the transfer of non-indigenous species is discussed.

4.1 Mass Loadings
Since numbers that quantify the constituents of the various components of this discharge are unknown and variable, mass loading calculations cannot be performed with any accuracy. However, generalized statements regarding the mass loadings can be made based upon the physical features of the discharge.

4.1.1 Welldeck Washouts
Spills from vehicle and equipment maintenance within the welldeck could potentially result in the discharge of substances such as oil. These spills can leave a residue on the deck. However, spills are controlled by shipboard procedures for spill containment and clean-up. Oily patches on the decks are cleaned with a detergent. 2 

### The small amounts of constituents remaining as surface films in the welldeck do not support the production of significant mass loadings.

4.1.2 LCAC Engine Washes
The degree to which engine contaminants are removed by the wash water is unknown and the amounts of engine washes within 12 n.m. are unknown. Since there are many LCACs and not all of them are operating each day or are not within U.S. waters, it will be assumed that 1 LCAC is operating each day in U.S waters and requires an engine wash. Since the gas turbine engines are relatively clean, it is assumed that, at most, a few tablespoons of hydrocarbon constituents will be removed by each wash. Using these numbers, only 3-5 gallons of hydrocarbon constituents would be released by the engine washes, per year, in U.S. waters.

4.1.3 Graywater and Air Conditioning Condensate
As discussed in section 3.2.3 above, it is estimated that 30 gallons of graywater can be discharged from an LCU while the host ship is transiting to 12 n.m. LCUs are not normally

### Welldeck Discharges 10 carried onboard amphibious ships since LCACs are favored. Assuming 10 LCUs are carried onboard ships during a year, and assuming that each ship transits the 12 n.m. zone 6 times per year, it is estimated that, at most, 1800 gallons of graywater will be released per year during transit. These assumptions overestimate the amounts of graywater produced because it is unlikely that each LCU on a host ship is discharging graywater at the maximum design rate during the entire 12 n.m. transit. Graywater production is likely to be much lower during transit because the LCU crew is occupied with preparations for, or stand down from, welldeck operations. In port, mass loadings of graywater can equal the design rate so each LCU could produce 180 gallons per day (32,760 gallons per year assuming 6 months in port).
Based on the discussions in the Refrigeration/AC Condensate NOD Report, the condensate discharge contains little or no constituents and insignificant mass loadings are expected.

4.1.4 Vehicle, Equipment, and Landing Craft Washes
These washes are directed at the external surfaces of vehicles, equipment, and landing craft. The engine compartments are not washed. Any hydrocarbon constituents would be present as films on exterior surfaces. Assuming that a tablespoon (29.6 mL) of oil was present and washed off per vehicle, landing craft, etc., and that 1000 are washed in U.S. waters per year, only about 4 gallons of oil would be released per year. However, it is felt that a tablespoon is an overestimate of the amount of oil that could be removed by such washes.

4.1.5 USDA Washes and Inspections
Although somewhat similar to 4.1.3 discussed above, the vehicle portion of these washes are substantially longer and include a high-pressure wash of the engine compartments external to the vehicles. However since these washes are almost entirely performed shoreside, only the effluent from those vehicles washed in the welldeck has the potential to enter the water. Assuming 20 vehicles per year are given this wash while in U.S. waters, and half a pint (473 mL) of oil is removed from each, only 1.25 gallons of oil would be released per year. However, these assumptions will tend to overestimate of the amount of oil that could be removed by such washes.
The other portion of this discharge, the washing of the welldeck and vehicle storage areas, will only occur several times a year, at most, since the USDA washes and inspections are normally conducted while the ship is still overseas. Furthermore, the hydrocarbon constituents present will be in the form of surface films so significant mass loadings are not expected.

4.2 Environmental Concentrations
Since numbers that quantify the volumes and constituents of the various components of this discharge are unknown and variable, concentrations cannot be performed with any accuracy. However, generalized calculations and statements regarding the mass loadings can be made based upon the known physical features of the discharge.

### Welldeck Discharges 11 4.2.1 Welldeck Washout
Spills from vehicle and equipment maintenance within the welldeck could potentially result in the discharge of substances such as oil. The spills can coat the deck with a residue. However, the spills are controlled by shipboard procedures for spill containment and clean-up. Oily patches on the decks are cleaned with a detergent. 2 

### The small amounts of constituents remaining as surface films in the welldeck do not support the production of significant mass loadings. The large water volumes involved (see 3.2.1) and the small volumes contained in the surface films do not appear to support the production of significant contaminant concentrations in the washouts and it is not expected that they will exceed federal or state water quality criteria. The visual criteria for oily discharges is that the discharge does not cause a sheen while the Act to Prevent Pollution from Ships limits the oil content of the discharge to 15 parts per million (approximately 15 mg/L). Florida has set a criterion of 5,000 micrograms per liter ( μ g/L) with no visible sheen.

4.2.2 LCAC Engine Washes
Since this discharge comprises a low volume of water which passes through an engine and is in contact with hydrocarbons, it is believed that water quality criteria can be exceeded. A rough estimate of contaminant concentrations can be performed to check the validity of assuming that hydrocarbon concentrations in the discharge can exceed water quality criteria. It does not seem unreasonable to assume that one teaspoon (4.9 mL) of hydrocarbon constituents could be deposited within the gas turbine engine and washed away in the discharge. The 4.9 mL placed in 12 gallons (45.42 L) of water (daily wash) will yield a hydrocarbon concentration of about 108,000 ppb of oil which exceeds the Florida water quality criterion of 5,000 ppb of oil. This rough calculation supports the assumption that water quality criteria can be exceeded. There is also the possibility that trace amounts of metals could be present that exceed federal and state water quality criteria. Furthermore, the nature of the detergent wash will liberate more hydrocarbon constituents and it is still assumed that water quality criteria can be exceeded, even though twice as much water is used.

4.2.3 Graywater and Air Conditioning Condensate
As discussed in section 3.2.3 above, it is estimated that 30 gallons of graywater can be discharged from an LCU while the host ship is transiting the 12 n.m. zone, or 180 gallons per day in port. LCU graywater has not been sampled, but it is possible that graywater sampling data for surface ships can be applied to the LCUs. According the Graywater NOD Report, the measured concentrations of several metals in the discharge exceed ambient water quality criteria and the estimated loadings of nutrients, solids, and oxygen-demanding substances are high.
As discussed in section 3.2.3 above, it is estimated that 30 to 48 gallons of airconditioning condensate can be produced each day. Based on the Refrigeration/AC Condensate NOD Report, this discharge contains little or no constituents and has a low probability of producing an environmental effect.

### Welldeck Discharges 12 4.2.4 Vehicle, Equipment, and Landing Craft Washes
Although concentrations have not been calculated, the low volumes of water that are mixed with small amounts of hydrocarbon constituents, are not considered to exceed federal or state water quality criteria or to have an environmental effect.

4.2.5 USDA Washes and Inspections
The discharge from the USDA washes of the welldeck and vehicle storage areas will contain dirt, debris, detergents, and hydrocarbons in concentrations that could possibly exceed federal discharge standards or state water quality criteria. The washes of the welldeck will also contain metals from the ship ’ s firemain.

4.3 Potential for Introducing Non-Indigenous Species
Although washes and inspections are required by the USDA for the vehicles, equipment, landing craft, welldeck, and vehicle storage areas, the potential for introducing non-indigenous species exists when the washes occur in U.S. ports. The wash water effluent could potentially carry non-indigenous species from the ship into the water. It should be noted that the USDA washdowns are intended to prevent transfer of non-indigenous species to land and the viability of any waterborne species introduced is questionable since they generally would have been exposed to air for extended periods of time prior to their introduction into U.S. coastal waters (i.e., for the most part, these species would have been removed from vehicles and deck surfaces and thus it would not be a water-to-water transfer, in contrast to species transfers from ballast water systems).

5.0 CONCLUSIONS
If uncontrolled, discharges from the well deck could possibly have the potential to cause an adverse environmental effect because oil drippings spilled during vehicle and equipment maintenance would leave an oil film on the deck surface. When the welldeck is flooded, the oil film can be washed from the deck by the incoming water. An oil sheen could possibly be discharged when water within the welldeck is discharged. However, current management practices provide for the clean-up of oil and other substances spilled during routine maintenance. These practices reduce the possibility of discharging an oil sheen.

6.0 DATA SOURCES AND REFERENCES
To characterize the discharge, information from various sources was obtained. Process information and assumptions were used to estimate the rate of discharge. Information to determine the concentrations and loadings of constituents is not available. Table 1 shows the sources of data used to develop this NOD report.

### Welldeck Discharges 13 Specific References

1. Sharpe, Richard. Jane's Fighting Ships. Jane's Information Group, Ltd., 1996. 790-792.

2. Report on the Ship Check of USS Kearsarge (LHD 3) by M. Rosenblatt & Son, Inc. (MR&S) dated October 1, 1997.

3. UNDS Equipment Expert Meeting Minutes - Welldeck Washout, October 3, 1996.

4. Welldeck/LCAC Questionnaire c ompleted by Assault Craft Unit 4, June 1997.

5. Operating Instructions for LCAC/Welldeck Operations, SEAOPS Manual for LCAC, Volume III, Revisions 1 and 2. September 30, 1995.

6. Eaton, Tim, CAPT USMC, USS Kearsarge. Gas Turbine Water Washes, 10 October 1997, David Eaton, MR&S, Inc.

7. Committee Print Number 95-30 of the Committee on Public Works and Transportation of the House of Representatives, Table 1.

8. The Water Quality Guidance for the Great Lakes System, Table 6A. Volume 60 Federal Register, p. 15366. March 23, 1995.

General References
USEPA. Toxics Criteria for Those States Not Complying with Clean Water Act Section 303(c)(2)(B). 40 CFR Part 131.36.
USEPA. Interim Final Rule. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants; States ’ Compliance – Revision of Metals Criteria. 60 FR 22230. May 4, 1995.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants. 57 FR 60848. December 22, 1992.
USEPA. Water Quality Standards; Establishment of Numeric Criteria for Priority Toxic Pollutants for the State of California, Proposed Rule under 40 CFR Part 131, Federal Register, Vol. 62, Number 150. August 5, 1997.
Connecticut. Department of Environmental Protection. Water Quality Standards. Surface Water Quality Standards Effective April 8, 1997.
Florida. Department of Environmental Protection. Surface Water Quality Standards, Chapter 62-302. Effective December 26, 1996.

### Welldeck Discharges 14 Georgia Final Regulations. Chapter 391-3-6, Water Quality Control, as provided by The Bureau of National Affairs, Inc., 1996.
Hawaii. Hawaiian Water Quality Standards. Section 11, Chapter 54 of the State Code.
Mississippi. Water Quality Criteria for Intrastate, Interstate and Coastal Waters. Mississippi Department of Environmental Quality, Office of Pollution Control. Adopted November 16, 1995.
New Jersey Final Regulations. Surface Water Quality Standards, Section 7:9B-1, as provided by The Bureau of National Affairs, Inc., 1996.
Texas. Texas Surface Water Quality Standards, Sections 307.2 - 307.10. Texas Natural Resource Conservation Commission. Effective July 13, 1995.
Virginia. Water Quality Standards. Chapter 260, Virginia Administrative Code (VAC) , 9 VAC 25-260.
Washington. Water Quality Standards for Surface Waters of the State of Washington. Chapter 173-201A, Washington Administrative Code (WAC).

### Welldeck Discharges 15 Figure 1. Basic View of an Amphibious Ship Ballasted and Deballasted

### Welldeck Discharges 16 Table 1. Data Sources

Data Source NOD Section Reported Sampling Estimated Equipment Expert 2.1 Equipment Description and Operation X

2.2 Releases to the Environment X 2.3 Vessels Producing the Discharge UNDS Database X 3.1 Locality X 3.2 Rate X 3.3 Constituents MSDS X 3.4 Concentrations X X 4.1 Mass Loadings X 4.2 Environmental Concentrations X4.3 Potential for Introducing NonIndigenous Species X

### B- 1 

### Appendix B Matrix of Navy Vessels and Discharges

### Appendix B Navy Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & ReverseOsmosis BrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily MachineryWastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine WetExhaustSonar Dome DischargeSubmarine BilgewaterSurface VesselBilgewater/OWS DischargeUnderwater Ship HusbandryWelldeck Discharges

AC X X X X AFDB 4 X X X X X AFDB 8 X X X X X AFDL 1 X X X X X X AFDM 3 X X X X X X AFDM 14 X X X X X X AGER 2 X X X X X X X X AGF 3 X X X X X X X X X X X X X X AGF 11 X X X X X X X X X X X X X X AGOR 21 X X X X X X X X X X X X AGOR 23 X X X X X X X X X X X X AGSS 555 X X X X X X X X X X X AO 177 X X X X X X X X X X X X X AOE 1 X X X X X X X X X X X X X X X AOE 6 X X X X X X X X X X X X X X X AP X X X X X APL X X X X AR X X X X X X ARD 2 X X X X X X X ARDM X X X X X X X ARS 50 X X X X X X X X X X X X AS 33 X X X X X X X X X X X X X X AS 39 X X X X X X X X X X X X X X ASDV X X X X X X X AT X X X X X X

B-2

### Appendix B Navy Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & ReverseOsmosis BrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily MachineryWastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine WetExhaustSonar Dome DischargeSubmarine BilgewaterSurface VesselBilgewater/OWS DischargeUnderwater Ship HusbandryWelldeck Discharges

ATC X X X X X X X BH X X X X BT X X X BW X X X X CA X X X X CC X X X X CG 47 X X X X X X X X X X X X X X X X X CGN 36 X X X X X X X X X X X X X X X CGN 38 X X X X X X X X X X X X X X X CM X X X X X CT X X X X X CU X X X X X CV 59 X X X X X X X X X X X X X X X CV 63 X X X X X X X X X X X X X X X X CVN 65 X X X X X X X X X X X X X X X CVN 68 X X X X X X X X X X X X X X X X DB X X X X DD 963 X X X X X X X X X X X X X X X X X DDG 51 X X X X X X X X X X X X X X X X X DDG 993 X X X X X X X X X X X X X X X X X DSRV-1 X X X X X X X DSV 1 X X X X X X X DT X X X X DW X X X X FFG 7 X X X X X X X X X X X X X X X X X

B-3

### Appendix B Navy Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & ReverseOsmosis BrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily MachineryWastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine WetExhaustSonar Dome DischargeSubmarine BilgewaterSurface VesselBilgewater/OWS DischargeUnderwater Ship HusbandryWelldeck Discharges

HH X X X X HL X X X X HS X X X X IX X X X X X IX 35 X X X X X IX 501 X X X X X IX 308 X X X X X X LA X X X X LCAC 1 X X X X X X LCC 19 X X X X X X X X X X X X LCM(3) X X X X X X X LCM(6) X X X X X X X LCM(8) X X X X X X X LCPL X X X X X X LCU 1610 X X X X X X X LCVP X X X X X X LH X X X X LHA 1 X X X X X X X X X X X X X X X X LHD 1 X X X X X X X X X X X X X X X LPD 4 X X X X X X X X X X X X X X X X LPD 7 X X X X X X X X X X X X X X X X LPD 14 X X X X X X X X X X X X X X X X LPH 2 X X X X X X X X X X X X X LSD 36 X X X X X X X X X X X X X X X LSD 41 X X X X X X X X X X X X X X X X

B-4

### Appendix B Navy Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & ReverseOsmosis BrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily MachineryWastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine WetExhaustSonar Dome DischargeSubmarine BilgewaterSurface VesselBilgewater/OWS DischargeUnderwater Ship HusbandryWelldeck Discharges

LSD 49 X X X X X X X X X X X X X X X X LST 1179 X X X X X X X X X X X X X MC X X X X MCM 1 X X X X X X X X X X X X X MHC 51 X X X X X X X X X X X X ML X X X X MM X X X X MW X X X X NM X X X X NS X X X X X X X X PB X X X X X X X PBR X X X X X X X PC 1 X X X X X X X X X X X PE X X X X PF X X X X PG X X X X PK X X X X PL X X X X X X PR X X X X PT X X X X RB X X X X X X RX X X X X X X SB X X X SC X X X X SES 200 X X X X X X

B-5

### Appendix B Navy Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & ReverseOsmosis BrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily MachineryWastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine WetExhaustSonar Dome DischargeSubmarine BilgewaterSurface VesselBilgewater/OWS DischargeUnderwater Ship HusbandryWelldeck Discharges

SLWT X X X X X X SS X X X X SSBN 726 X X X X X X X X X X X X SSN 637 X X X X X X X X X X X X SSN 640 X X X X X X X X X X X X SSN 671 X X X X X X X X X X X X SSN 688 X X X X X X X X X X X X ST X X X X TC X X X X TD X X X X TR X X X X X X X UB X X X X X X VP X X X X WB X X X X WH X X X X WT X X X X YC X X X YCF X X X YCV X X X YD X X X YDT X X X YFB X N X X X YFN X X X YFNB X X X YFND X X X

B-6

### Appendix B Navy Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & ReverseOsmosis BrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily MachineryWastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine WetExhaustSonar Dome DischargeSubmarine BilgewaterSurface VesselBilgewater/OWS DischargeUnderwater Ship HusbandryWelldeck Discharges

YFNX X X X X X X YFP X X X X YFRN X X X X YFRT X X X X X YFU 83 X X X X X X YFU 91 X X X X X X YGN 80 X X X X X YL X X X X YLC X X X X YM X X X X YMN X X X YNG X X X YO 65 X X X X X X X YOG 5 X X X X X X X YOGN X X X X X YON X X X X YOS X X X X YP 654 X X X X X X X YP 676 X X X X X X X YPD X X X YR X X X YRB X X X YRBM X X X YRDH X X X YRR X X X

B-7

### Appendix B Navy Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & ReverseOsmosis BrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily MachineryWastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine WetExhaustSonar Dome DischargeSubmarine BilgewaterSurface VesselBilgewater/OWS DischargeUnderwater Ship HusbandryWelldeck Discharges

YRST X X X YSD 11 X X X X X X X YSR X X X YTB 752 X X X X X X X YTB 756 X X X X X X X YTB 760 X X X X X X X YTL 422 X X X X X X X YTM X X X X X YTT 9 X X X X X X X X YWN X X X X

B-8

### Appendix B Navy Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

AC AFDB 4 X X AFDB 8 X X AFDL 1 X X AFDM 3 X X AFDM 14 X X AGER 2 X X X X AGF 3 X X X X X X X X AGF 11 X X X X X X X X AGOR 21 X X X X X AGOR 23 X X X X X AGSS 555 X X X X AO 177 X X X X X X X AOE 1 X X X X X X X X AOE 6 X X X X X X X X AP X APL X X X AR X ARD 2 X X X ARDM X X X ARS 50 X X X X X X X AS 33 X X X X X X X AS 39 X X X X X X X ASDV X AT X X

B-9

### Appendix B Navy Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

ATC X X X BH BT BW CA CC CG 47 X X X X X X X CGN 36 X X X X X X X CGN 38 X X X X X X X CM X CT CU X CV 59 X X X X X X X X CV 63 X X X X X X X X CVN 65 X X X X X X X X X CVN 68 X X X X X X X X X DB DD 963 X X X X DDG 51 X X X X DDG 993 X X X X DSRV-1 X DSV 1 X DT DW FFG 7 X X X X X

B-10

### Appendix B Navy Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

HH HL HS IX IX 35 IX 501 X IX 308 X LA LCAC 1 LCC 19 X X X X X X X LCM(3) X X LCM(6) X X LCM(8) X X LCPL X LCU 1610 X X X X LCVP X LH LHA 1 X X X X X X X X LHD 1 X X X X X X X X LPD 4 X X X X X X X X LPD 7 X X X X X X X X LPD 14 X X X X X X X X LPH 2 X X X X X X X X LSD 36 X X X X X X X X LSD 41 X X X X X X X X

B-11

### Appendix B Navy Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

LSD 49 X X X X X X X X LST 1179 X X X X X X X X MC MCM 1 X X X X X X X MHC 51 X X X X X X X ML MM MW NM NS X PB X X PBR X X PC 1 X X X X X PE PF PG PK PL X PR PT RB X RX X SB SC SES 200 X

B-12

### Appendix B Navy Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

SLWT X SS SSBN 726 X X X X X X X X X SSN 637 X X X X X X X X X SSN 640 X X X X X X X X X SSN 671 X X X X X X X X X SSN 688 X X X X X X X X X ST TC TD TR X X UB X VP WB WH WT YC YCF YCV YD YDT YFB X X YFN X X YFNB YFND X X

B-13

### Appendix B Navy Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

YFNX X X X X YFP X X YFRN YFRT YFU 83 X YFU 91 X YGN 80 X YL YLC YM YMN YNG YO 65 X YOG 5 X YOGN YON YOS YP 654 X YP 676 X YPD YR YRB YRBM X X YRDH X X YRR

B-14

### Appendix B Navy Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

YRST YSD 11 X YSR YTB 752 X YTB 756 X YTB 760 X YTL 422 X YTM YTT 9 X YWN

B-15

### C- 1 

### Appendix C Matrix of MSC Vessels and Discharges

### Appendix C MSC Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & Reverse OsmosisBrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily Machinery WastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine Wet ExhaustSonar Dome DischargeSubmarine BilgewaterSurface Vessel Bilgewater/OWSDischargeUnderwater Ship HusbandryWelldeck Discharges

AE 26 X X X X X X X X X X X AFS 1 X X X X X X X X X X X X AG 194 X X X X X X X X X X AGM 22 X X X X X X X X X X X AGOS 1 X X X X X X X X X X X X AGOS 19 X X X X X X X X X X X X AGS 26 X X X X X X X X X X X X X AGS 45 X X X X X X X X X X X X X AGS 51 X X X X X X X X X X X X X AGS 60 X X X X X X X X X X X X X AH 19 X X X X X X X X X X X X X AO 187 X X X X X X X X X X X X X ARC 7 X X X X X X X X X X X ATF 166 X X X X X X X X X X X X X

C-2

### Appendix C MSC Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

AE 26 X X X X X X X AFS 1 X X X X X X X AG 194 X X X X X X X AGM 22 X X X X X X X AGOS 1 X X X X X AGOS 19 X X X X X AGS 26 X X X X X X AGS 45 X X X X X AGS 51 X X X X X AGS 60 X X X X X AH 19 X X X X X X X AO 187 X X X X X X ARC 7 X X X X X X X ATF 166 X X X X X

C-3

### D- 1 

### Appendix D Matrix of Coast Guard Vessels and Discharges

### Appendix D Coast Guard Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & Reverse OsmosisBrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily Machinery WastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine Wet ExhaustSonar Dome DischargeSubmarine BilgewaterSurface Vessel Bilgewater/OWSDischargeUnderwater Ship HusbandryWelldeck Discharges

ANB X X X X ANB(X) X X X X ATB X X X X BU X X X X BUSL X X X X FR X X X X LC X X X X MCB X X X X MLB X X X X MSB X X X X PSB X X X X PWB X X X X RHIB X X X X RHIL X X X X RHIM X X X X SKI X X X X SPC X X X X SRB X X X X TANB X X X X UTB X X X X UTL X X X X W/P X X X X WAGB 290 X X X X X X X X X X X X X X X WAGB 399 X X X X X X X X X X X X X X X WHEC 378 X X X X X X X X X X X X X X X

D-2

### Appendix D Coast Guard Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & Reverse OsmosisBrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily Machinery WastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine Wet ExhaustSonar Dome DischargeSubmarine BilgewaterSurface Vessel Bilgewater/OWSDischargeUnderwater Ship HusbandryWelldeck Discharges

WIX 295 X X X X X X X X X X X X X X WLB 180A X X X X X X X X X WLB 180B X X X X X X X X X WLB 180C X X X X X X X X X WLB 225 X X X X X X X X X WLI 100A X X X X X X X WLI 100C X X X X X X X WLI 65303 X X X X X X X WLI 65400 X X X X X X X WLIC 100 X X X X X X X WLIC 160 X X X X X X X WLIC 75A X X X X X X X WLIC 75B X X X X X X X WLIC 75D X X X X X X X WLM 157 X X X X X X X WLM 551 X X X X X X X WLR 115 X X X X X X WLR 65 X X X X X X WLR 75 X X X X X X X WMEC 210A X X X X X X X X X X X X X

WMEC 210B X X X X X X X X X X X X X

WMEC 213 X X X X X X X X X X X X X WMEC 230 X X X X X X X X X X X X X

D-3

### Appendix D Coast Guard Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & Reverse OsmosisBrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily Machinery WastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine Wet ExhaustSonar Dome DischargeSubmarine BilgewaterSurface Vessel Bilgewater/OWSDischargeUnderwater Ship HusbandryWelldeck Discharges

WMEC 270A X X X X X X X X X X X X X

WMEC 270B X X X X X X X X X X X X X

WP X X X X X X WPB 110A X X X X X X X X WPB 110B X X X X X X X X WPB 110C X X X X X X X X WPB 82C X X X X X X X X WPB 82D X X X X X X X X WTGB 140 X X X X X X X WYTL 65A X X X X X X X WYTL 65B X X X X X X X WYTL 65C X X X X X X X WYTL 65D X X X X X X X

D-4

### Appendix D Coast Guard Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

ANB ANB(X) ATB BU BUSL FR LC MCB MLB MSB PSB PWB RHIB RHIL RHIM SKI SPC SRB TANB UTB UTL W/P WAGB 290 X X X X X X WAGB 399 X X X X X X

D-5

### Appendix D Coast Guard Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

WHEC 378 X X X X X X WIX 295 X X X X X WLB 180A X X X X X WLB 180B X X X X X WLB 180C X X X X X WLB 225 X X X X X WLI 100A X X X X WLI 100C X X X X WLI 65303 X X X X WLI 65400 X X X X WLIC 100 X X X X WLIC 160 X X X X WLIC 75A X X X X WLIC 75B X X X X WLIC 75D X X X X WLM 157 X X X X WLM 551 X X X X WLR 115 X X X X WLR 65 X X X X WLR 75 X X X X WMEC 210A X X X X X X WMEC 210B X X X X X X WMEC 213 X X X X X X WMEC 230 X X X X X X

D-6

### Appendix D Coast Guard Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

WMEC 270A X X X X X X WMEC 270B X X X X X X WP X X X X WPB 110A X X X X WPB 110B X X X X WPB 110C X X X X WPB 82C X X X X WPB 82D X X X X WTGB 140 X X X X WYTL 65A X X X X WYTL 65B X X X X WYTL 65C X X X X WYTL 65D X X X X

D-7

### E- 1 

### Appendix E Matrix of Army Vessels and Discharges

### Appendix E Army Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & Reverse OsmosisBrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily Machinery WastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine Wet ExhaustSonar Dome DischargeSubmarine BilgewaterSurface Vessel Bilgewater/OWSDischargeUnderwater Ship HusbandryWelldeck Discharges

BC X X BD X X X X X X BG X X X BK X X CF X X X X X CHI X X X X X FB X X X X HF X X X X X J-BOAT X X X X X LCM-8 MOD 0 X X X X X LCM-8 MOD 1 X X X X X LCU-1600 X X X X X X X LCU-2000 X X X X X X X X X LSV X X X X X X X X LT-100 X X X X X X X LT-128 X X X X X X X X PB X X X Q-BOAT X X X X X ST-45 X X X X X X X ST-65 X X X X X X X SLWT X X X X X T-BOAT X X X X X WORKBOATS X

E-2

### Appendix E Army Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

BC X BD X X X BG X BK X CF X X CHI X X FB X X HF X X J-BOAT X X LCM-8 MOD 0 X X LCM-8 MOD 1 X X LCU-1600 X X X LCU-2000 X X X X X LSV X X X X LT-100 X X X X X LT-128 X X X X X PB X Q-BOAT X X ST-45 X X ST-65 X X SLWT X X T-BOAT X X WORKBOATS

E-3

### F- 1 

### Appendix F Matrix of Marine Corps Vessels and Discharges

### Appendix F Marine Corps Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-LaunchChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & Reverse OsmosisBrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily Machinery WastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine Wet ExhaustSonar Dome DischargeSubmarine BilgewaterSurface Vessel Bilgewater/OWSDischargeUnderwater Ship HusbandryWelldeck Discharges

CRRC X X X RRC X X X

F-2

### Appendix F Marine Corps Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSubmarine Emergency DieselEngine Wet ExhaustSub Outboard Equip. Grease &External Hydraulics

CRRC RRC

F-3

### G- 1 

### Appendix G Matrix of Air Force Vessels and Discharges

### Appendix G Air Force Vessel Discharges to be Regulated

Ship ClassAqueous Film Forming FoamCatapult Water-Brake Tank &Post-Launch Retraction ExhaustChain Locker EffluentClean BallastCompensated Fuel BallastCPP Hydraulic FluidDeck RunoffDirty BallastDistillation & Reverse OsmosisBrineElevator Pit EffluentFiremain SystemsGas Turbine Water WashGraywaterHull Coating LeachateMOGAS CompensatedOverboard DischargesNon-Oily Machinery WastewaterPhoto Lab DrainsSeawater Cooling OverboardDischargeSeawater Piping BiofoulingPreventionSmall Boat Engine Wet ExhaustSonar Dome DischargeSubmarine BilgewaterSurface Vessel Bilgewater/OWSDischargeUnderwater Ship HusbandryWelldeck Discharges

MR X X X X X X X X P X X X X TR X X X X U X X X X

G-2

### Appendix G Air Force Vessel Discharges Not to be Regulated

Ship ClassBoiler BlowdownCatapult Wet AccumulatorDischargeCathodic ProtectionFreshwater Lay-upMine CountermeasuresEquipment LubricationPortable Damage Control DrainPump DischargesPortable Damage Control DrainPump Wet ExhaustRefrigeration/AC CondensateRudder Bearing LubricationSteam CondensateStern Tube Seals & UnderwaterBearing LubricationSubmarine AcousticCountermeasures LauncherDischargeSub Emergency Diesel EngineWet ExhaustSub Outboard Equipment Grease& External Hydraulics

MR X X X P TR U

G-3