### This document is part of Appendix A, and includes the Surface Vessel Bilgewater/Oil Water Separator: Nature of Discharge for the “Phase I Final Rule and Technical Development Document of Uniform National Discharge Standards (UNDS),” published in April 1999. The reference number is EPA-842-R-99-001.



# Phase I Final Rule and Technical Development Document of Uniform National Discharge Standards (UNDS)

Surface Vessel Bilgewater/Oil Water Separator: Nature of Discharge

April 1999

## NATURE OF DISCHARGE REPORT

Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge

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 1

### 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 2

### 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. OWS 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 DISCHARGE CHARACTERISTICS

Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 3

### 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 4

### 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

FCVN

### (flow rate) = (RCVN

### )(D CVN 

### NCVN

### ) RCVN 

### = ship flow rate, gpd D CVN 

### = days in port annually per ship NCVN 

### = number of ships

FCVN 

### = (3,000) (147) (11) = 4.9 million gallons per year ) (

Other Ship Classes

FO

### (flow rate) = (RO 

### DO 

### NO

### )

FO 

### = (2,000) (193) (220) = 84.9 million gallons per year ) ( ) (

Overall Fleet

FFLEET 

### = F CVN

### (million gals/year)+ FO

### (million gals/year)

FFLEET 

### = 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 bilgewater 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 5

### 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 previous 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 Concentrations

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 discharge 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 6

### Validated bilgewater/OWS constituent 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.

M(tph) CVN(pounds/year) = (VCVN(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) (1x106 

### gals/million gals) (454 grams/pound) (1,000 mg/gram)

MCVN

### = (4.9) (9.64) (8.34) = 394 pounds/year

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.

Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 7

### 2. Ratioing the total flow for the fleet (89.8 mgd) to the aircraft carrier class (CVN 68) flow for (4.9mgd) , and multiplying the aircraft carrier loading by the ratio.

MFLEET 

### = (FFLEET

### / Fcvn

### ) (MCVN

### )

MFLEET 

### = (89.8/4.9)(394)=7220 pounds/year

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.

Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 8

### 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 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).

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 10

### 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 11

### Figure 1. U.S. Navy Oil Water Separator (OWS) Process Flow Diagram (Typical)

Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 12

### Table 1. Vessels Equipped With Oil/Water Separator Systems

SHIP CLASSIFICATION INFORMATION TRANSIT INFORMATION CLASS ID NO. ARMED SERVICE CLASS NAME SHIP TYPE NO. OF SHIPS PROPULSION SYSTEM TRAN­ DAYS IN 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 13

### Table 1. Vessels Equipped With Oil/Water Separator Systems (cont'd)

SHIP CLASSIFICATION INFORMATION TRANSIT INFORMATION CLASS ID NO. ARMED SERVICE CLASS NAME SHIP TYPE NO. OF SHIPS PROPULSION SYSTEM TRAN­ DAYS IN 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 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 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 15

### 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

Ship Class Average Daily Flow per Ship (gals/day) Annual Flow per Ship (gals/yr) Total Annual Flow (million gals/yr) 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 16

### Table 4. Ship Study Bilgewater Pollutant Summary5

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(mg/ L) 600 110 30 <5,000 <10 40 2,600 10 10 20 310 Cu (mg/ L) 6,400 540 430 1,050 5,320 1,180 1,720 790 300 360 1,450 Fe (mg/ L) 46,000 810 260 2,560 28,000 18,900 14,600 1,130 1,620 2,600 1,030 Zn (mg/ L) 4,300 810 190 1,900 6,560 1,390 16,200 1,590 410 2.5 2,720 Cd (mg/ L) 67 10 5 21 156 44 280 <3 <5 14 82 Ag (mg/ L) 10 <10 10 <50 <10 <10 80 10 <10 <10 <10 Ni (mg/ L) 3,500 270 130 170 890 550 650 400 210 120 1,590 Mn (mg/ L) 3,000 220 20 140 1,350 1,150 370 61 110 210 269 Pb (mg/ L) 230 20 <20 <30 2,900 30 270 20 50 <50 60 As (mg/ L) 3 6 6 3 7 <4 18 10 4 2 4 Ba (mg/ 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 17

### Table 5. Ship Study OWS Influent and Effluent Contaminant Concentration Data5

USS VINCENNES USS SAN JACINTO USS VANCOUVER USS PENSACOLA USS MANITOWOC

Units (CG 49) (CG 56) (LPD 2) (LSD 38) (LST 1180) Parameter Influent Effluent Influent Effluent Influent Effluent Influent Effluent Influent Effluent

COD mg/L 660 530 810 760 900 780 520 470 2,800 1,600 BOD TOC TSS O&G Ammonia Fecal Coliform mg/L mg/L mg/L mg/L mg/L cts/100 ml NA 145 34 37 2.2 NA NA 129 38 27 1.1 NA 94 56.8

62 143 <0.10 49 6,740 34.6

19

8 <0.10 94 <142 42 123 47 0.18 NA <142 34 62 20 0.29 NA 101 39 41 10 <0.10

110 98 31 29

4 <0.10 49 341 570 2,684 2,593

NA

2 335 224 114 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 mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ 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 mg/ L mg/ L mg/ L mg/ L mg/ 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 mg/ L mg/ L mg/ L mg/ L mg/ 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 18

### Table 6. Naval Station San Diego Bilgewater Characterization Data Summary6 

### (Calendar Years 1993 through 1995)

Parameter No. of Analyses Values Above MDL (units in mg/L) 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.



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### Table 7. Navy Destroyer (DDG 64) OWS Effluent Discharge Data Summary7

May to September, 1996

Parameter No. of Analyses Values Above MDL (mg/L)
No. Of Values Min. Max. Median Std. Dev.

Oil in Water (Navy) 28 28 13 670 151 205
Arsenic 11 6 10 70 20 23 Barium 18 18 30 535 118 124 Cadmium 18 3 10 10 10 NA Chromium 18 10 10 60 20 16 Copper 18 18 430 6,110 1,.410 1,400 Lead 18 15 10 195 40 62 Iron 18 18 300 4,620 1,280 1,210 Manganese 18 18 20 150 48 41 Mercury 18 2 10 10 10 NA Nickel 18 18 140 1,510 320 317 Selenium 11 11 70 210 100 40 Silver 18 1 10 10 10 NA Zinc 18 18 480 8,880 2,190 1,930

July 30, 1996 (mg/L) Sample A Sample B Sample C Parameter NRL LLI NRL LLI NRL LLI Oil and Grease (EPA 418.1) 29 70 66 Petroleum Hydrocarbons 38 73 70 MBAS 0.13 0.11 0.16 Benzene 79 50 77 49 70 55 Ethylbenzene 71 59 59 54 64 54 Methylene Chloride <5 64 <5 63 <5 20 Toluene 170 80 170 78 150 81 Xylene (total) 460 289 450 266 410 264 Diethyl Phthalate <10 10 12 2,4-Dimethylphenol 110 110 110 Dimethyl Phthalate 11 12 13 Fluorene 12 17 20 Naphthalene 63 61 14 Phenanthrene 16 27 30 Phenol 46 47 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 20

### Table 8. Auxiliary Ship (AS 36) OWS Effluent Discharge Data Summary7 

### (May 2 through September 12, 1996)

Parameter Method No. of Values Above MDL (mg/L) No. of Min. Max. Median Std. Detection Level Analyses Values Dev.
Oil in Water NA 44 44 0.5 93 5.4 20.1 BOD NA 8 8 1 34 3.5 10.1 COD NA 14 14 26 260 61 79.5 TSS NA 10 10 1 57 12.5 16 Antimony 600 14 0 NA NA NA NA Arsenic 10 14 0 NA NA NA NA Beryllium 5 14 0 NA NA NA NA Cadmium 10 14 0 NA NA NA NA Chromium 20 14 0 NA NA NA NA Copper NA 14 14 44 661 257 166 Lead 100 14 0 NA NA NA NA Iron NA 11 11 786 2,200 1,050 427 Mercury 0.2 14 1 1.6 1.6 NA NA Nickel NA 14 14 75 471 117 103 Selenium 10/5 14 0 NA NA NA NA Silver 30 14 0 NA NA NA NA Thallium 10 14 14 NA NA NA NA Zinc NA 14 14 164 1,100 382 283
NOTE: NA = Information not available.



### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 21

### Table 9. Aircraft Carrier (CVN 74) Oil/Water Separator Influent/Effluent Raw Data4

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 mg/L 132 179 258 258 86 148 195 148 BOD mg/L 31 5 17 11 18 18 22 10 TOC mg/L 28 9 24 21 26 20 19 11 TSS mg/L 38 64 38 46 36 48 70 23 O&G mg/L 50 22 269 17 42 36 122 27 TKN mg/L 1.6 1.7 2.0 1.7 1.4 1.6 1.2 1.0 Ammonia mg/L 0.14 <0.10 0.19 0.17 0.15 0.17 <0.10 <0.10 Nitrate + Nitrite (As N) mg/L 054 0.20 0.44 0.30 0.50 0.40 0.62 0.0 Total Phosphorous mg/L 3.2 1.2 3.7 2.7 3.9 2.2 3.1 2.0

TDS mg/L 7,360 16,620 5,570 9,720 5,920 10,260 8,970 13,320 Chloride mg/L 4,126 9,742 3,616 7,359 3,531 8,125 3,956 8,040 Sulfate mg/L 498 1,290 411 643 446 780 643 958 Sulfide mg/L 5 2 10 8 10 8 10 5 Total Alkalinity mg/L 36 64 40 46 40 48 48 58
Cyanide mg/ 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 mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ L mg/ 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) mg/ L mg/ L mg/ L mg/ 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 22

### 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 (mg/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 23CADMIUM 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 (mg/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 (mg/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 24

### 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 NITROGENA 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 (mg/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 25

### Table 11. Mean Concentrations of Constituents that Exceed Water Quality Criteria

Constituent Log Minimum Maximum Federal Acute Water Quality Most Stringent State Normal Concentration Concentration Criteria Acute Water Quality Mean Criteria Classicals (mg/L) AMMONIA AS 0.09 BDL 0.17 None 0.006 (HI) A NITROGEN NITRATE/NITRITE 0.27 0.2 0.4 None 0.008 (HI) A TOTAL KJELDAHL 1.5 1.1 1.7 None

- NITROGEN TOTAL 1.77 None 0.2 (HI) A NITROGENB TOTAL 1.81 1.2 2.7 None 0.025 (HI) A PHOSPHOROUS TPH (SGT-HEM) 9.64 6 16 visible sheena/ 15 b 5 (FL) Mercury (ng/L) MERCURY * 51.8 32.05 79.8 1800 25 (FL, GA) Metals (mg/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 26

### 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



### Surface Vessel Bilgewater/Oil Water Separator (OWS) Discharge 27