Based on a high-resolution geophysical survey consisting of frequency enhanced 3-D seismic, Enhanced Surface 

Renderings, (ESR‟s), ESR‟s with amplitudes applied and AUV high-resolution data, West Boreas F/L-2 PLET Sled-8120 in 

MC 762 appears suitable for the planned activity.

West Boreas Manifold MFD-8100 (MC 762)

West Boreas Manifold MFD-8100 in MC 762 will be located near the center of a near-surface ancient slump valley. There 

is no other evidence of seafloor or near-surface faulting, slumping, amplitude or fluid expulsion features in the vicinity of 

this manifold. The manifold will not disturb any high-density areas of deepwater benthic communities.

An Industrial Waste Dump site is identified in MC 806, south of MC 762. This dumpsite consists of drums that have 

deteriorated over time. Some of the drums had been dropped outside of the limits of the site and are identified on the 

Geologic Features Map (Map 5) of the GEMS report. Within 2,000 feet of the manifold site, there are 19 sonar targets 

identified as potential barrels with a 50-foot recommended avoidance, and 2 sonar targets identified as modern debris 

with 100 foot avoidance. The closest target is identified as Target # 665, 406.60 feet southwest of the manifold.

The manifold will be positioned over 1,700 feet east of ATP‟s flowline and 3450 feet north of Shell‟s Europa to Mars 

Flowlines. The manifold will not interfere with these flowlines. Currently, there are no other flowlines within the vicinity 

of the manifold.

Based on a high-resolution geophysical survey consisting of frequency enhanced 3-D seismic, Enhanced Surface 

Renderings, (ESR‟s), ESR‟s with amplitudes applied and AUV high-resolution data, West Boreas Manifold MFD-8100 in MC 

762 appears suitable for the planned activity.

Arlette C. Nunez

Shallow Hazards Coordinator

Attached is Shell‟s Waste Barrel Avoidance and Release Response Plan.

B - F

Pursuant to NTL No. 2008-G04 the proposed operations covered by this DOCD do not involve operations impacting the 

following: Topographic features map, Topographic features statement (shunting), Live bottoms, (Pinnacle Trend) map, 

Live bottoms (low relief) map, or potentially sensitive biological features map.

G. Remotely Operated Vehicle (ROV) Monitoring Plan

In accordance with the provisions of NTL 2008-G06, Remotely Operated Vehicle Surveys in Deepwater, Mississippi 

Canyon Block 807 is located in Grid 13. Grid 13 is an area that has adequate ROV survey coverage; therefore we are 

not proposing to run the pre- and post-ROV survey in accordance with the NTL. 

H. Threatened and Endangered Species Information

There are 5 species of sea turtles that may be found in the Gulf of Mexico (see Table 6.6 below). No critical habitat for 

these species has been designated in the Gulf of Mexico.
Common Name Scientific Name T/E Status

Hawksbill Turtle Eretmochelys imbricata E

Green Turtle Chelonia mydas T

Kemp's Ridley Turtle Lepidochelys kempii E

Leatherback Turtle Dermochelys coriacea E

Loggerhead Turtle Caretta caretta T

Table 6.6 – Threatened and Endangered Sea Turtles

There are 29 species of marine mammals that may be found in the Gulf of Mexico (see Table 6.7 below). Of the species 

listed as Endangered, only the Sperm whale is commonly found in the project area. No critical habitat for these species 

has been designated in the Gulf of Mexico.

Common Name Scientific Name T/E Status

Atlantic Spotted Dolphin Stenella frontalis

Blainville's Beaked Whale Mesoplodon densirostris

Blue Whale Balaenoptera musculus E

Bottlenose Dolphin Tursiops truncatus

Bryde's Whale Balaenoptera edeni

Clymene Dolphin Stenella clymene

Cuvier's Beaked Whale Ziphius cavirostris

Dwarf Sperm Whale Kogia simus

False Killer Whale Pseudorca crassidens

Fin Whale Balaenoptera physalus E

Fraser's Dolphin Lagenodelphis hosei

Gervais' Beaked Whale Mesoplodon europaeus

Humpback Whale Megaptera novaeangliae E

Killer Whale Orcinus orca

Melon-headed Whale Peponocephala electra

Minke Whale Balaenoptera acutorostrata

Northern Right Whale Eubalaena glacialis E

Pantropical Spotted Dolphin Stenella attenuata

Pygmy Killer Whale Feresa attenuata

Pygmy Sperm Whale Kogia breviceps

Risso's Dolphin Grampus griseus

Rough-toothed Dolphin Steno bredanensis

Sei Whale Balaenoptera borealis E

Short-finned Pilot Whale Globicephala macrorhynchus

Sowerby's Beaked Whale Mesoplodon bidens

Sperm Whale Physeter macrocephalus E

Spinner Dolphin (Long-snouted) Stenella longirostris

Striped Dolphin Stenella coeruleoalba

West Indian manatee Trichechus manatus E

Table 6.7 – Threatened and Endangered Marine Mammals

The EIA found in Section 18 discusses potential impacts and mitigation measures related to threatened and endangered 

species. 
I. Archaeological Report

Shell will comply with all conditions of NTL 2005-G07, 2011-Joint-G01 and guidance from the BOEM.gov website 

“Guidance for Compliance with Mitigation 3.20 Avoidance of Archeological Resources.”

J. Air and Water Quality Information

Pursuant to NTL 2008-G04 the proposed operations covered by this DOCD do not require Shell to provide additional 

information relating to air and water quality information. For specific information relating to air and water quality 

information please refer to Section 18 of this plan. 

K. Socioeconomic Information

Pursuant to NTL 2008-G04 the proposed operations covered by this DOCD do not require Shell to provide additional 

information relating to air and water quality information. For specific information relating to socioeconomic information 

please refer to Section 18 of this plan. 
OLYMPUS Host – MARS “B” Development 

MISSISSIPPI CANYON BLOCK 807 

Waste Barrel Avoidance and Release 

Response in the Mississippi Canyon 

Area 

Project OLYMPUS Host – MARS “B” Development 

Document Title Waste Barrel Avoidance and Release 

Response in the Mississippi Canyon Area 

Document Number MRB-100-HX-0505-0000002-000

Document Revision REV 2 

Version Code Not Applicable 

Document Status Issued for Review 

EIS Discipline / Document Type Hazard Analysis Report

Originator / Author Robert Kuehn 

Classification Restricted 

ECCN EAR 99 

Issue Date 10/20/10 

Revision History is shown on next page 
Document Number -Rev Page 2 of 8 

RESTRICTED

REVISION HISTORY 

Rev # Date of 

Issue 

Issue Description Originator Reviewer Approver 

2 10/20/10 Formalized existing 

document into 

Document Mgmt 

program 

RB Kuehn RB Kuehn Nilesh Popat 

 

Summary 
Document Number -Rev Page 3 of 8 

RESTRICTED

Contents 

PURPOSE ............................................................................................................................ 4

REVISION HISTORY ....................................................................................................... 4

BACKGROUND ................................................................................................................. 4

NORMAL OPERATIONS ....................................................................................................... 5

DECONTAMINATION OF EQUIPMENT ................................................................................... 6
Waste Barrel Avoidance and Release Response in the Mississippi Canyon Area 

10/20/10 REV 2 

4 of 8 

Purpose 

This document provides expectations and guidance for avoiding, and responding to a release of 

the contents of, a seafloor waste barrel. The procedures below describes Shell’s expectations for 

routine barrel avoidance, data management, and response to inadvertent release of barrel 

contents. 

Applicability 

This document applies to all ROV, anchor and other operations which could cause a seafloor 

barrel rupture. 

Changes to this procedure must be approved by BOEMRE.1 

Revision History 

Date Person Revision 

12/16/08 RBKuehn Incorporated comments from MMS2 and issued as final. 

8/16/10 RBKuehn Incorporated comment from BOEMRE3 to include New Orleans District 

manager in the notification of Step 2 of the section Barrel Impact Reporting. 

Also revised all relevant references to MMS as BOEMRE 

10/20/10 RBKuehn 3⁄4 In Background, added in summary of suspected materials disposed at the 

site, based on research of the site in public records. 

3⁄4 In section on Equipment Decontamination- Decon Procedure:

o clarified what types of detergents are preferred/allowed, using the 

NPDES Vessel General Permit as a guide. 

o Expanded on appropriate PPE and other personnel precautions 

o Noted a need for secondary containment as appropriate 

Significant changes to the text are shown in yellow shade. 

3⁄4 Added page numbers and cleaned up format. 

 

3⁄4 Issued as REV 2 

Background 

Various projects will be carried out in an area of the Mississippi Canyon known to contain 

barrels of chemical waste. 

 

1 Per MMS approval of West Boreas Supplemental Exploration Plan, MS 5231 December 16, 2008 

Control No. S-07273, Lease(s) OCS-G07957, Block 762, Mississippi Canyon Area OCS-G07962, Block 806, 

Mississippi Canyon Area

2 Per MMS approval of West Boreas Supplemental Exploration Plan, MS 5231 December 16, 2008 

Control No. S-07273, Lease(s) OCS-G07957, Block 762, Mississippi Canyon Area OCS-G07962, Block 806, 

Mississippi Canyon Area

3

 Per BOEM approval of the Supplement to the Conceptual DWOP for Mars B project, 8/12/10, MS 5220 
Waste Barrel Avoidance and Release Response in the Mississippi Canyon Area 

10/20/10 REV 2 

5 of 8 

• The barrels were discharged in this area in the 1970’s under government approved 

permits. 

• The content, and its toxicity, of each individual barrel is not known. However, there are 

records of a wide range of industrial waste materials that were disposed in the barrels 

including chlorinated hydrocarbons and liquid metal salts. Below is a summary of the 

barrel contents based on available records. 

1. Metallic sodium and calcium; calcium oxide, sodium oxide, and inert salts.4 

2. 80-90% dichlorobutene, 20% organic high-boilers, and 1% quaternary 

ammonium salts. “Other wastes produced from the manufacture of fungicides 

and herbicides”.5

• Within the area there are/could be many hundreds of waste barrels. Many of the barrels 

may have released their contents over time. However, an unknown number of barrels still 

look intact, and they may or may not still contain their original content. Also, as some of 

the barrels contained metal based solid waste, some of the barrels that no longer look 

intact may still contain some waste. 

• Extensive sonar surveys of the area exist and are available for planning purposes. 

Potential Hazards 

Although there are no records of any issues regarding the barrels during the many years of Oil 

and Gas operations in the Mississippi Canyon area, the following potential hazards exist: 

• Personnel exposure or equipment damage due to adherence of waste chemicals to 

recovered subsea equipment 

• Equipment damage from sodium exposure to water (very vigorous reaction). 

Normal Operations 

For normal operations, all contractors and Shell employees must meet the following 

expectations: 

1. Shell’s over-arching policy is to avoid barrel contact. 

2. Press releases making any reference to the chemical waste or barrels, or any incidents 

involving any chemical waste or barrels, will require the express written permission from 

 

4

 EPA Permit Application No. 730D009E from Ethyl Corp, March 1, 1977, Public Notice April 20, 1977, 5

 Chapter 5 “Ocean Discharge” in the book Assessing Potential Ocean Pollutants, A Report of the Study Panel on Assessing 

Potential Ocean Pollutants. National Academy of Sciences, Washington DC, 438 pp. This document details DuPont’s application 

to dispose of the following at the ocean disposal site
Waste Barrel Avoidance and Release Response in the Mississippi Canyon Area 

10/20/10 REV 2 

6 of 8 

Shell. 

3. All recorded video material is confidential and the property of Shell (standard contract 

provision). 

If during normal ROV operations there is a discovery of any potential archaeological 

resource (i.e., cannot be definitively identified as waste barrel/barrel remnant, modern debris, 

or refuse), any seafloor-disturbing activities in its proximity, must be stopped, the discovery 

must be reported to Dr. Chris Horrell at 504-736-2796, and further instructions must be 

obtained before proceeding. 

4. Equipment Placement/Stand-off Distance

4.1. A safe stand-off distance from the waste barrels is considered 10m (33ft). Care must be 

taken that flexible components (e.g. ROV tether, anchor lines, seismic cables) are 

controlled as well (e.g. don’t drag through a barrel field). 

4.2. If a seafloor action will generate cuttings or debris, increase the stand-off distance as 

needed to avoid debris contact with nearby barrels. 

4.3. Do not investigate any barrels or remainders of barrels. Remain the minimum stand-off 

of 10m (33ft) at all times. 

4.4. Survey the anchor/pile/export locations with an ROV to ensure barrel avoidance. 

4.5. Record the (approximate) location of any chemical waste barrel seen, if feasible, 

without getting closer than the 10m (33ft) stand-off distance. 

5. Contact the Shell EP Company Environmental Duty Phone for any questions or concerns. 1-

504-390-1330 

6. Decontamination of Equipment: In the event of contact with a barrel contents decontaminate 

equipment per Decontamination of Equipment below. 

7. Make reports of barrel contact/rupture per Barrel Release Reporting below. 

Decontamination of Equipment 

1. General 

In the unlikely case that contact is suspected or has been made with any wastes from a barrel, 

appropriate action needs to be taken to guarantee the topside safety of personnel handling the 

equipment (e.g. ROV, anchor lines, etc). 

It is left solely to the judgment of the Person-in-Charge of the 

equipment/vessel to determine if it is necessary to abandon all or part of 

the equipment on the sea floor. 

2. Decon Procedure 
Waste Barrel Avoidance and Release Response in the Mississippi Canyon Area 

10/20/10 REV 2 

7 of 8 

Based on various factors6

, Shell recommends the following: 

2.1. Use the ocean to “wash” the equipment (e.g. fly an ROV for at least an hour at depth 

high enough above sea floor to prevent umbilical dragging or other disturbance of the 

sea floor). For other equipment, provide any movement through the water column 

that’s possible, again avoiding seafloor dragging. 

2.2. Retrieve the equipment to the surface, but do not bring onboard if feasible. 

2.3. Hose the equipment off before retrieving onto the vessel. Use as high a water flow as 

is available/safe. CAUTION- detergent/soap may be used BUT in as low a quantity 

as practicable to minimize foam. Only non-toxic and phosphate free cleaners and 

detergents may be used. Furthermore, cleaners and detergents should not be caustic or 

only minimally caustic and should be biodegradable7. 

2.4. Avoid physical contact with the equipment, and keep the equipment off the vessel at 

this point.. 

2.5. Dunk the equipment back in the sea and “wash” the equipment for approximately 15 

minutes. 

2.6. Retrieve the equipment to the surface. Before recovering, visually inspect the 

equipment, umbilical, cable surfaces with binoculars for signs of corrosion, 

discoloration, air reaction such as fuming/smoking, or any other signs of chemical 

contact. Rewash and dunk the equipment as needed. 

2.7. Retrieve the equipment onto the back deck. Monitor the equipment and surrounding 

storage area for indications of chemical contamination (corrosion, discoloration, air 

reaction such as fuming/smoking, etc). Establish secondary containment as necessary 

to collect any potentially contaminated drips. 

2.8. Only essential personnel should be allowed near the equipment, once retrieved on the 

back deck. 

2.9. While performing cleaning operations on the equipment, involving contact with 

potentially contaminated surfaces, personal protective equipment must be worn 

including, but not limited to: safety eye goggles, safety clothing such as coverall and 

 6 Shell assumes, for purposes of this decontamination guidance, that: 

• The most toxic material identified in the disposal area’s permits and other available documents is involved . However Shell cannot guarantee 

there are not other toxic materials present than those identified in the permits and other documents. 

• It is assumed that the materials do not chemically interact with the materials of the ROV, its tools and equipment. 

7

 The NPDES General Permit for Discharges Incidental to the Normal Operation of a Vessel provides insight into managing any 

washing. Also, EPA provides the following definitions: 

“Non-toxic” soaps, cleaners, and detergents means these materials which do not exhibit potentially harmful characteristics as 

defined by the Consumer Product Safety Commission regulations found at 16 CFR Chapter II, Subchapter C, Part 1500. 

“Phosphate Free” soaps, cleaners, and detergents means these materials which contain, by 

weight, 0.5% or less of phosphates or derivatives of phosphates.
Waste Barrel Avoidance and Release Response in the Mississippi Canyon Area 

10/20/10 REV 2 

8 of 8 

aprons, Nitrile type chemical resistant industrial-safety gloves, and PVC boots. 

2.10. Wash hands thoroughly and take a shower after performing cleaning operations on 

the equipment. 

2.11. Avoid drinking liquids or eating food in the work area. 

2.12. If contamination is still suspected, consult with the Shell representatives/management 

for further actions including additional washing, abandonment on the seafloor, 

segregated storage on the boat, wrapping the equipment partially or fully in plastic 

sheeting, etc. 

2.13. Document all actions and results in a log. 

Barrel Impact Reporting 

1. Initial reporting:

1.1. Equipment operator is to inform the Shell onsite representative and the Shell 

operations supervisor on duty. 

1.2. The Shell onsite representative or the Shell operations supervisor will call the 

SEPCO Environmental Duty Engineer at 1-504-390-1330. As a back-up, call 337-

281-0783 (Rob Kuehn). 

• The call should be made at the earliest convenience. 

• Be prepared to report the lat/long of the ruptured barrel (not the surface location) 

and water depth. 

2. The SEPCO Environmental Duty Engineer will call 

• the regulatory Affairs Duty Phone 504-782-7823, 

• Mr. Broussard of the BOEMRE (504-736-3245) and 

• BOEMRE New Orleans District Manager 

to report the event. The call should include the lat/long and any circumstances of note. 

3. Follow-up Reporting

The SEPCO Environmental Duty Engineer or Rob Kuehn follows up with an email to 

Mr. Broussard of BOEMRE. 

The BOEMRE have requested submission of a copy of whatever relevant video is 

available for the event period. No dedicated video survey is required for a barrel rupture 

(i.e. just be prepared to submit whatever video was obtained as normal part of the 

activities). BOEM has agreed we can submit any video after the project is completed. 
Note: Please specify if the amount reported is a total or per well amount

Type of Waste and Composition Composition Projected Amount Discharge rate Discharge Method Answer yes or no

Will drilling occur ? If yes, you should list muds and cuttings

EXAMPLE: Cuttings wetted with ynthetic based fluid 

Cuttings generated while using synthetic 

based drilling fluid. X bbl/well X bbl/day discharge pipe No

Water-based drilling fluid (PHPA) barite, additives, mud 3,100 bbls/well 18 bbl/day

Overboard discharge line to 78.75’ below 

the water level No

Cuttings wetted with water-based fluid cuttings coated with water based drilling mud 780 bbls/well 5 bbl/day

Overboard discharge line to 78.75’ below 

the water level No

Cuttings wetted with synthetic-based fluid 

Cuttings generated while using synthetic 

based drilling fluid. 5,270 bbls/well 31 bbl/day

Overboard discharge line to 78.75’ below 

the water level No

Synthetic based drilling fluid adhering to washed drill 

cuttings

Synthetic based drilling fluid adhering to 

washed drill cuttings 210 bbls/well 1 bbl/day

Overboard discharge line to 78.75’ below 

the water level through the discharge line No

Chemical product waste Chemical product waste 50 bbls/well 12 gal/day

Treated to meet NPDES limits and 

discharged overboard No

Will humans be there? If yes, expect conventional waste

EXAMPLE: Sanitary waste water X liter/person/day NA chlorinate and discharge No

Domestic waste Gray water (laundry, galley, lavatory) 5580 gal/day 5580 gal/day

Grinded to less than 25 mm mesh size 

and discharge overboard No

Sanitary waste Black water (treated human body waste from toilets) 7500 gal/day (design) 7500 gal/day (design)

Treated in the MSD** prior to discharge 

to meet NPDES limits No

Is there a deck? If yes, there will be Deck Drainage

Production Deck Drainage Rainwater/washwater 673 GPM 673 GPM

Via direct discharge (low contamination 

potential streams). Via sump and sump 

pile system for potentilly contaminated 

drainage. No

Deck Drainage from Drilling rig Rainwater/washwater 271 GPM 271 GPM

Via direct discharge (low contamination 

potential streams). Via sump and sump 

pile system for potentilly contaminated 

drainage. No

Will you conduct well treatment, completion, or workover? 

well treatment fluids - all 24 wells Frac Fluid 500 bbls/well 3 bbl/day

Overboard discharge line to 78.75’ below 

the water level through the discharge line No

well completion fluids - 13 wells Calcium Chloride 2,000 bbls/well 12 bbl/day

Overboard discharge line to 78.75’ below 

the water level through the discharge line No

No

Miscellaneous discharges. If yes, only fill in those associated with your activity. 

Excess cement at seafloor Cement slurry 225 bbls/well 56 gal/day

Overboard discharge line to 78.75’ below 

the water level through the discharge line No

Desalinization unit discharge Reject water from watermaker unit 28 gal/min 28 gal/min Discharged overboard above waterline No

Ballast water treated seawater

1000 gal/min design max of the 

facility- this value is 

independent of number of 

wells)

1000 gal/min design max of the 

facility- this value is independent 

of number of wells) Discharged overboard above waterline No

Firewater treated seawater

5000 gpm/pump (design 

flowrate of the facility- this 

value is independent of 

number of wells)

5000 gpm/pump (design 

flowrate of the facility- this value 

is independent of number of 

wells) Discharged overboard above waterline No

Cooling water hypochlorite-treated seawater 42 gpm max 42 gpm max

Discharged overboard below waterline 

(via sump caisson) No

Utility Seawater hypochlorite-treated seawater < 500 gal/min < 500 gal/min

Discharged overboard below waterline 

(via sump caisson) No

Will you produce hydrocarbons? If yes fill in for produced water.

Produced water treated formation water 70,000 bbl/day design max.

70,000 bbl/day design max (Over 

the life of the facility). Discharged overboard below waterline NA

Will you be covered by an individual or general NPDES permit ? GENERAL PERMIT GMG 290103

NOTE: If you will not have a type of waste, enter NA in the row. 

TABLE 7A: WASTES YOU WILL GENERATE, TREAT AND DOWNHOLE DISPOSE OR DISCHARGE TO THE GOM

Projected 

Downhole 

Projected generated waste Projected ocean discharges Disposal
Solid and Liquid Wastes 

transportation 

Type of Waste Composition Transport Method Name/Location of Facility Amount Disposal Method

Will drilling occur ? If yes, fill in the muds and cuttings.

EXAMPLE: Oil-based drilling fluid or mud NA NA NA NA NA

Synthetic-based drilling fluid or mud Used SBF and additives storage tank on supply boat. MI Drilling Fluids - Fourchon, LA 4,782 bbls/well

Recycled/ 

Reconditioned

Completion Fluids - 11 wells

Used CaBr2\ZnBr2 and 

additives

storage tank on supply boat. Tetra - Fourchon, LA 2000 bbls/well

Recycled/ 

Reconditioned

Cuttings wetted with Synthetic-based fluid 

Drill cuttings from synthetic 

based interval.

Cuttings boxes transported on Supply 

boat. Newpark Environmental, Ingleside, TX 550 bbls / well Deep well

Will you produce hydrocarbons? If yes fill in for produced sand.

Produced sand produced sand various storage containers on boats Newpark Environmental, Fouchon, LA 100 bbl/yr deep well

EXAMPLE: trash and debris cardboard, aluminum, barged in a storage bin shorebase z tons total recycle

Trash and debris - recyclables

trash and debris,spent 

flourescent lamps for recycle various storage containers on boats

Omega Waste Management, W. 

Patterson, LA or ARC, New Iberia, LA

120 cubic 

yards/year recylce

Trash and debris - non-recyclables trash and debris various storage containers on boats Jefferson Parish Landfill

60 cubic 

yards/year landfill

used oil used oil various storage containers on boats

Omega Waste Management, W. 

Patterson, LA 8 tons/year recycle

chemical product wastes

unused chemicals or used 

chemicals various storage containers on boats

Safety Kleep, Denton, TX or Lamp 

Environmental, Hammond, LA 6000 gal/year

incineration or RCRA 

Subtitle C landfill

E&P waste

Process wastes such as 

sands/sludges various storage containers on boats Newpark Environmental, Fouchon, LA 100 bbl/yr deep well

NOTE: If you will not have a type of waste, enter NA in the row. 

Waste Disposal

TABLE 7B: WASTES YOU WILL TRANSPORT AND /OR DISPOSE OF ONSHORE 

Will you have additional wastes that are not permitted for discharge? If yes, 

fill in the appropriate rows. 

Note: Please specify whether the amount reported is a total or per well

Projected generated waste

Modeling Report - No modeling of discharges was performed.
SECTION 8: AIR EMISSIONS

A. Emissions Worksheet and Screening Questions

Screening Questions for DOCD’s Yes No

Is any calculated Complex Total (CT) Emission amount (in tons) associated with 

your proposed exploration activities more than 90% of the amounts calculated 

using the following formulas: CT = 3400D2/3 for CO, and CT = 33.3D for the other 

air pollutants (where D = distance to shore in miles)?

X

Do your emission calculations include any emission reduction measures or modified 

emission factors?

X

Does or will the facility complex associated with your proposed development and 

production activities process production from eight or more wells?

X

Do you expect to encounter H2S at concentrations greater than 20 parts per million 

(ppm)?

X

Do you propose to flare or vent natural gas in excess of the criteria set forth under 

250.1105(a)(2) and (3)?

X

Do you propose to burn produced hydrocarbon liquids? X

Are your proposed development and production activities located within 25 miles 

from shore?

X

Are your proposed development and production activities located within 200 

kilometers of the Breton Wilderness Area?

X

B. If you answer no to all of the above screening questions from the appropriate table, 

provide:

(1)Summary information regarding the peak year emissions for both Plan Emissions and 

Complex Total Emissions, if applicable. This information is compiled on the summary form of the 

two sets of worksheets. You can submit either these summary forms or use the format below. 

You do not need to include the entire set of worksheets.

Air Pollutant

Plan 

Emission1 

Amounts 

(tons)

Calculated 

Exemption2

Amounts 

(tons)

Calculated

Complex Total 

Emission 

Amounts3

(tons)

PM

SOx

NOx

VOC

CO

1

For activities proposed in your EP or DOCD, list the projected emissions calculated from the 

worksheets.

2

List the exemption amounts for your proposed activities calculated by using the formulas in 30 

CFR 550.303(d).

3

List the complex total emissions associated with your proposed activities calculated from the 

worksheets

(2) Contact: Sylvia Bellone, (504) 728-7215, Sylvia.Bellone@shell.com

Worksheets – See modeling report
Shell West Delta OCD 

August 16, 2011 

September 23, 2011 

Mr. Robert Kuehn 

Staff Environmental Engineer 

Shell Exploration and Production Company (EP-Americas) 

One Shell Square, OSS 3422 

New Orleans, LA 70161 

RE: OCD Modeling Results: Years 2013 through 2060 

Shell Mars B Host – Mississippi Canyon Block 807 

 

Dear Mr. Kuehn: 

This letter report outlines the results of the Offshore and Coastal Dispersion (OCD) modeling for 

Mars B Host construction, drilling and production operations for Shell Exploration and 

Production Company (Shell). 

Mars B operations are located in Mississippi Canyon Block 807 at latitude 28° 9' 35.59" 

(UTM 3,116,942.13 meters North, Zone 16) and longitude 89° 14' 20.86" (UTM 280,137.86 

meters East, Zone 16). 

The Bureau of Ocean Energy Management, Regulation and Enforcement (BOEMRE) has 

exemption criteria for offshore operations. These criteria are based on the projected highest 

annual emissions and the distance of the facility to the closest onshore area 

[30 CFR Part 250.303(d)]. 

Projected potential emissions from operations for PM, VOC, CO, and SO2 meet the exemption 

criteria for all modeled years (2011 through 2060); therefore, an air quality modeling analysis is 

not required for these pollutants. However, the projected highest potential emissions of NOx are 

above the exemption threshold for year 2013; therefore, an air quality modeling analysis has been 

performed for 2013 NOx emissions. 

ESTIMATED EMISSIONS

Shell has estimated the potential annual emissions associated with Mars B Host. As previously 

stated, the estimated potential annual emissions meet the BOEMRE exemption criteria for all 

pollutants except NOx. Details of the emissions exemption threshold analysis are presented in 

Appendix A. 

Potential emissions estimates for NOx were based on BOEMRE-approved emissions factors. 

Table 1 presents a summary of the potential-to-emit for each emission point. 

2800 Veterans Blvd., Suite 214 New Orleans, Louisiana 70002 U.S.A.(504)828-5845Fax (504) 828-7858 

Offices nationwide  trinityconsultants. c o m
Shell Mars B Host – OCD Modeling – Page 2 

September 23, 2011 

TABLE 1. SOURCE POTENTIAL TO EMIT1

Unit Name Model 

Input ID 

Model Input 

Emission Rate - 

LT/Annual 

(tpy) (g/s) 

Field Gas Compressor TRB-1001 FGC1 49.85 1.43 

Field Gas Compressor TRB-1051 FGC2 49.85 1.43 

Turbine Driven Generator Dual Fuel - TRB2101 TurbineNG1 23.83 0.69 

Turbine Driven Generator Dual Fuel - TRB2111 TurbineNG2 23.83 0.69 

Turbine Driven Generator Dual Fuel - TRB2121 TurbineNG3 23.83 0.69 

Turbine Driven Generator Dual Fuel - TRB2131 TurbineNG4 23.83 0.69 

Turbine Driven Generator Dual Fuel - TRB2141 TurbineNG5 23.83 0.69 

Turbine Driven Generator Dual Fuel - TRB2151 TurbineNG6 23.83 0.69 

Turbine Driven Generator Dual Fuel - Diesel TurbineDiesl 195.53 5.62 

Essential Generator ZAN-3021 EssentialGen 0.76 0.02 

Emergency Generator ZAN-3020 EmergGen 0.76 0.02 

Firewater Pump PBE-2331 FirePumpA 0.25 0.01 

Firewater Pump PBE-2351 FirePumpB 0.25 0.01 

Cold Start Air Compressor SKD-2020 ColdStrtComp 0.02 0.001 

Pedestal Crane CRN 2410 PedCrane1 4.07 0.12 

Pedestal Crane CRN 2420 PedCrane2 4.07 0.12 

Pedestal Crane CRN 2430 PedCrane3 4.07 0.12 

ZZZ-500 HP Flare - pilot gas HPFlarPilot1 0.02 0.00 

ZZZ-500 HP Flare HPFlareUpset 6.52 0.19 

ZZZ-510 Atm(LP) Flare - pilot gas LPFlarePilot 0.01 0.0002 

ZZZ-510 Atm (LP) Flare LPFlareUpset 0.52 0.01 

Cement Unit- Cat C15 CementUnit1 16.88 0.49 

Cement Unit- Cat C15 CementUnit2 16.88 0.49 

Misc small, temporary diesel engines (welding 

machines, air compressors etc) 

MISC 26.46 0.76 

Installation and support vessels PseudoVessls 1729.41 49.75 

 

1 Model input emission rates are based on emissions information provided by Mr. Robert Kuehn (Shell) via ftp to Ms. 

Sharon Killian (Trinity) sent on September 21, 2011 file name Mars B Host DOCD AQ 092111_Master.xls. 
Shell Mars B Host – OCD Modeling – Page 3 

September 23, 2011 

MODELING METHODOLOGY

Modeled emission rates (grams/second) were derived from the potential annual emission rate of 

each source for the annual and one-hour averaging periods for NO2. Note that while the 

exemption criteria are based on NOx emissions, the modeling significance level (MSL) and the 

National Ambient Air Quality Standard (NAAQS) is based on emissions of NO2 

[30 CFR Part 250.303(e)]. All emissions of NOx were assumed to be equal to NO2 for modeling 

purposes. 

Air Quality Model

The latest version of the OCD Model (Version 5.0, dated 05/16/2005) was used to assess the 

impacts of NOx emissions along the Louisiana and Mississippi shoreline. The objective of the 

analysis was to determine if the impacts from operations at Mars B Host would exceed the 

MSLs2 outlined in 30 CFR 250.303(e). 

On February 9, 2010,3 the US EPA established a new 1-hour NAAQS of 100 ppb for NO2. 

However, the final rules promulgating the 1-hour NO2 NAAQS did not include an MSL for the 

one-hour averaging period. Therefore, on June 29, 2010, EPA proposed an interim 1-hour 

Significant Impact Level (SIL) of four ppb for NO2. This interim standard is being used as a 

screening tool for completing the required air quality analyses for the new 1-hour NO2 NAAQS 

under the Prevention of Significant Deterioration (PSD) program.4 

The interim SIL is currently not included in 30 CFR 250.303(e). However, because BOEMRE 

has requested a comparison of the air emissions modeling analysis to the interim 1-hour NO2 SIL, 

Shell has assessed modeled impacts against the 1-hour NO2 interim SIL, in addition to the 

currently established annual NO2 SIL outlined in 30 CFR Part 250.303(e) .5

If the modeling analysis indicates that the interim NO2 1-hour SIL is exceeded, Shell will 

determine if the emissions from activities combined with the nearest representative onshore NO2 

monitored concentrations exceed the NO2 1-hour NAAQS.6 If the modeling analysis indicates 

that the emissions from activities combined with the nearest representative onshore NO2 

monitored concentrations do not exceed the NAAQS, the emissions will not significantly affect 

 

2 Modeling Significance Level (MSL) and Significant Impact Level (SIL) are used interchangeably. 

3 See 75 Fed. Reg. 6474 and 75 Fed. Reg. 35520. 

4 Based on U.S. EPA Memorandum from Stephen D. Page to Regional Air Division Directors titled, “Guidance 

Concerning the Implementation of the 1-hour NO2 NAAQS for the Prevention of Significant Deterioration Program,” June 29, 2010. 

5 Based on conversation between Ms. Holli Ensz (BOEMRE) and Mr. Bill Bruscino (Trinity) on March 7, 2011. 

6 Based on conversation between Mr. Dirk Herkhof (BOEMRE) and Mr. Bill Bruscino (Trinity) on March 31, 2011. 
Shell Mars B Host – OCD Modeling – Page 4 

September 23, 2011 

the air quality of an onshore area or a State in accordance with30 CFR 250.303(f). Additionally, 

BOEMRE would not require a Best Available Control Technology (BACT) analysis under 

30 CFR 250.303(h).7 

Based on the above requirements, the ambient modeled concentrations resulting from emissions 

generated from an offshore facility are compared to the SIL and NAAQS as shown in Table 2 

below. 

TABLE 2. APPLICABLE NAAQS AND SIGNIFICANT IMPACT LEVELS

Pollutant Averaging Period 

SIL 

(g/m3

) 

NAAQS 

(g/m3) 

NO2

Annual 1 100 

1-hour 7.58 1889

Source Parameters and Emission Rates 

Shell estimated potential annual emissions from emission sources associated with Mars B Host. 

It was determined that NOx emissions from Mars B Host operations in 2013 exceeded the 

exemption criteria of 30 CFR Part 250.303(d). Therefore, Shell has conducted an air quality 

modeling analysis for potential NO2 emissions for 2013. Modeled emission rates in grams per 

second were derived from the annual emission rate of each source (tons per year) for the 1-hour 

and annual averaging periods.10

As per previous BOEMRE guidance, support vessel emission sources may be co-located at the 

centroid11 of the operational area. Since Shell does not currently have stack parameter data 

specific to support vessels, and since the distance of the operational area from the shoreline is 

large relative to the distances in between the emission sources, Shell utilized a “pseudo-point12” 

 

7 Ibid. 

8 Based on 4ppb at normal atmospheric pressure and temperature. 

9 Based on 100ppb at normal atmospheric pressure and temperature. 

10 Based on conversation between Ms. Holli Ensz (BOEMRE) and Mr. Bill Bruscino (Trinity) on March 7, 2011, 

BOEMRE is requesting that applicants supply the 1-hour modeling results obtained from the annual NO2 modeling analysis. Based 

on this guidance, the annual and 1-hour NO2 modeling analysis results are based on the annual average emission rate for each 

emission source. 

11 It is assumed that the set of coordinates provided by Shell represent the coordinates for the center of the platform. 

12 Conservative default values. 
Shell Mars B Host – OCD Modeling – Page 5 

September 23, 2011 

parameters approach. This approach conservatively models operational activities for which 

actual stack parameter data are not available, as previously approved by BOEMRE on similar 

modeling projects: 

 Source location: 

o Latitude = 28° 9’ 35.59” North 

o Longitude = 89° 14’ 20.86” West 

 Stack Velocity13 = 0.001 m/s 

 Stack Diameter14 = 0.001 m 

 Stack Exit Temperature15 = 500° F 

For emission sources other than the support vessels, the air quality modeling was based on 

source-specific stack parameter data. The emission-point modeled source parameters for all 

sources are presented in Table 3. 

 

13 The stack velocity and stack diameter are based on previous guidance provided by BOEMRE and represent the 

guidance typically provided by state air regulatory agencies (e.g., Texas Commission on Environmental Quality [TCEQ]) for 

modeling fugitive sources in a representative manner by limiting the influence of stack-tip downwash. 

14 Ibid. 

15 Since all NOx-emitting sources are combustion-related, Shell proposes a conservative exit temperature of 500° F to 

account for buoyancy-induced dispersion. 
Shell Mars B Host – OCD Modeling – Page 6 

September 23, 2011 

TABLE 3. MODEL INPUT STACK PARAMETERS16

Source ID 

Location1 Stack 

Height 

Exit 

Temperature 

Exit 

Velocity 

Stack 

Diameter 

Dev of 

Stack 

X (km) Y (km) (m) (K) (m/s) (m) Angle 

FGC1 510.098 299.407 68.6 769 6.75 2.44 0 

FGC2 510.098 299.407 68.6 769 6.75 2.44 0 

TurbineNG1 510.084 299.391 56.7 797 17.7 1.07 45 

TurbineNG2 510.084 299.39 56.7 797 17.7 1.07 45 

TurbineNG3 510.084 299.388 56.7 797 17.7 1.07 45 

TurbineNG4 510.085 299.386 56.7 797 17.7 1.07 45 

TurbineNG5 510.084 299.396 56.7 797 17.7 1.07 45 

TurbineNG6 510.084 299.393 56.7 797 17.7 1.07 45 

TurbineDiesl 510.085 299.386 56.7 797 17.73 1.07 45 

EssentialGen 510.091 299.38 51.5 755 56.6 0.30 90 

EmergGen 510.091 299.381 51.5 755 56.6 0.30 90 

FirePumpA 510.092 299.377 38.4 740 73.23 0.20 90 

FirePumpB 510.108 299.378 38.4 740 73.23 0.20 90 

ColdStrtComp 510.088 299.383 49.1 755 57.02 0.09 0 

PedCrane1 510.086 299.396 74.4 740 73.23 0.20 90 

PedCrane2 510.109 299.407 74.4 740 73.23 0.20 90 

PedCrane3 510.112 299.386 71.9 740 73.23 0.20 90 

HPFlarPilot1 510.093 299.41 93.9 1273 20 0.06 45 

HPFlareUpset 510.093 299.41 198.7 1273 20 24.27 45 

LPFlarePilot 510.093 299.41 93.9 1273 20 0.06 45 

LPFlareUpset 510.093 299.41 112.2 1273 20 3.96 45 

CementUnit1 510.094 299.574 49.4 632 39.86 0.20 45 

CementUnit2 510.094 299.574 49.4 632 39.86 0.20 45 

MISC 510.094 299.574 6.1 533 0.001 0.001 0 

PseudoVessls 510.094 299.574 6.1 533 0.001 0.001 0 

 

16 For each flare, equivalent stack heights and stack diameters have been calculated to account for the buoyancy flux from 

the flares that contribute to the plume based on SCREEN3 User’s Guide (http://www.azdeq.gov/environ/air/download/modeling.pdf). 

The equivalent stack parameter calculations also incorporate the heat release from the flares (MMBtu/hr). 
See Figure 1-2

See Figure 1-3

= Recep= Mars B

Figure 1-1. AREA MAP – RECEPTOR LOCATIONS

Shell Offshore, Inc.

Mars B Host– Mississippi Canyon
Figure 1-2. AREA MAP – RECEPTOR LOCATIONS

Shell Offshore, Inc.

Mars B Host– Mississippi Canyon
Figure 1-3. AREA MAP - RECEPTOR LOCATIONS

Shell Offshore, Inc.

Mars B Host– Mississippi Canyon
Shell Mars B Host – OCD Modeling – Page 10 

September 23, 2011 

Meteorological Data

The OCD model requires both over-land and over-water meteorological data. The following 

meteorological datasets were used for the air quality modeling analyses to determine the potential 

impacts of the operations at Mars B Host on onshore receptors: 

 Water temperature, over-water air temperature, over-water dew point temperature, overwater wind speed, and over-water wind direction from Station 42040 – Luke Offshore 

Test Platform, an off-shore buoy operated by the National Data Buoy Center (NDBC). 

 Over-land surface observations of key meteorological variables from the Patterson, LA 

National Weather Service (NWS) station. 

 Upper air observations of key meteorological variables from the Slidell, LA NWS 

station. 

The above data sources were selected for this analysis because: 

 Station 42040 is located at a distance of 95.69 miles from the location of the West Delta 

platform. While data is available from NDBC for other stations located relatively closer 

to the location of operations, it is proposed to use the data from Station 42040 as it is the 

most complete and representative of the over-water conditions that prevail at the location 

of operations. 

For example Station BURL1 is located closest to the location of operations at a distance 

of 52.82 miles. However, this station is almost at the edge of the Mississippi River delta 

and, due to its proximity to land, the data from it will not be as representative of the overwater conditions that prevail at the location of operations as Station 42040. Similarly, 

other offshore NDBC stations located relatively closer to the location of operations do 

not have complete, representative, or recent years data available (2000 onwards). 

 Slidell, (LA) NWS station is the closest upper air meteorological station providing 

reliable data. 

 Patterson (LA) NWS is the closest surface meteorological station providing reliable data. 

The data sources presented above have been selected in accordance with BOEMRE guidance, 

as provided in the Five-Year Meteorological Datasets for CALMET/CALPUFF and OCD5 

Modeling of the Gulf of Mexico Region (July 2008).17 According to Section 4.1 of this 

document, OCD Group 5a must use over-water data from Buoy 42040, surface onshore data 

from the Patterson NWS station, and upper-air data from Slidell NWS station. Since the 

location of Mars B Host qualifies as part of OCD Group 5a, Shell is using the above 

meteorological data. 

Shell used meteorological data for five consecutive years (2000 through 2004, inclusive), in this 

air quality modeling analysis. The over-water and over-land meteorological datasets for the MET 

 

17 Five-Year Meteorological Datasets for CALMET/CALPUFF and OCD5 Modeling of the Gulf of Mexico Region, U.S. 

Department of the Interior, Minerals Management Service, Gulf of Mexico OCS Region (July 2008). 
Shell Mars B Host – OCD Modeling – Page 11 

September 23, 2011 

stations above were the most complete to use for the modeling analysis. This decision is based 

on a modeling protocol previously submitted to BOEMRE by Shell for a similar modeling 

project. 

Model runs were performed using over-water mixing heights of 300, 600, and 900 meters for 

years 2000 through 2004, inclusive, in accordance with BOEMRE guidance on previous similar 

modeling projects. Over-land meteorological data was processed using the USEPA 

Meteorological Preprocessor for Regulatory Models (MPRM). 

Missing elements in the datasets were accounted for using EPA-recommended procedures.18 

Several methods were used to replace missing over-water data, including: 

 Linear interpolation was used to obtain missing wind speed values. 

 A unit vector average was used to substitute for a single missing wind direction value. 

 Two- to ten-hour periods of missing wind speed and direction data were subjectively 

filled based on the persistent weather pattern in the surrounding area. 

Meteorological data files are included as Attachment B in electronic format (attached CD). 

Receptor Locations and Land-Mass Configuration

A series of 100 discrete receptors spaced three miles apart were placed along the Louisiana and 

the Mississippi (Gulf Coast) shorelines closest to the Mars B Host location. Additionally, two 

receptors were placed in the Class I Breton Wilderness Area (Louisiana) and five receptors were 

placed on the Chandeleur Islands (located within the Breton Wilderness Area) to assess impacts 

on federal Class 1 Areas. This is consistent with previous guidance provided by BOEMRE for 

similar modeling projects for offshore operations. 

MODEL OPTIONS

The OCD model options are listed in the modeling input file (included on the CD in 

Attachment B). All sources modeled in this analysis are considered to be point sources. Because 

the Gulf Coast area of concern is situated at sea level, no terrain features were considered 

(i.e., simple terrain only). 

MODELING RESULTS

A review of the OCD modeling results indicates that operations at Mars B Host do not exceed the 

SIL for the NO2 annual averaging period. The results for the Breton receptors also demonstrate 

that the Mars B Host operations do not exceed the MSL or the Class I PSD Increment for the 

annual NO2 standard. However, the maximum modeled concentrations exceed the respective 

SILs for the 

 

18 Missing Data Procedures for Substituting Values for Missing NWS Meteorological Data for Use in Regulatory Air 

Quality Models, EPA SCRAM, July 7, 1992. 
Shell Mars B Host – OCD Modeling – Page 12 

September 23, 2011 

1-hour averaging period for NO2 for the Breton receptors as well as for the entire region. 

The results also indicate that the maximum modeled concentrations for the 1-hour averaging 

period for NO2 combined with the nearest representative onshore NO2 monitored concentrations 

do not exceed the NO2 1-hour NAAQS for the Breton receptors as well as for the entire region.19 

Table 4 presents the summarized results of the three-year average of the 98 percentile of the daily 

maximum concentration of NO2 monitored at the Kenner monitoring station. Kenner is the 

closest station to the receptor set with representative monitoring data. 

TABLE 4. MONITORING STATION DATA20

98% Daily Max ppm (μg/m3

) 

2007 0.055 103.48 

2008 0.048 90.31 

2009 0.048 90.31 

Average 0.050 94.70 

Other tables and attachments in this report include: 

 Table 5 presents the summarized results from the modeling analysis performed for 

operations at Mars B Host for the Breton Wilderness Class I area. 

 Table 6 presents the summarized results for the entire modeled region. 

 OCD modeling output files are included as Attachment B in electronic format (attached 

CD). 

 A concentration table containing results for each receptor from each model run is 

presented as Attachment C. 

 Attachment D contains concentration table results specifically for each receptor in the 

Breton Wilderness Class I area. 

 

19 Based on modeling protocol submitted for Shell’s West Boreas operations by Mr. Bill Bruscino (Trinity) to Mr. Dirk 

Herkhoff (BOEMRE) on April 4, 2011. 

20 Monitoring station data was obtained from the LDEQ website for the most recent 3 years for hourly concentrations of 

NO2. 
Shell Mars B Host – OCD Modeling – Page 13 

September 23, 2011 

TABLE 5. MAXIMUM MODELED CONCENTRATIONS FOR ALL BRETON RECEPTORS

Pollutant Averaging 

Period 

Maximum 

Modeled 

Concentration 

(μg/m3

) 

Modeling 

Significance 

Level 

(μg/m3) 

Significant? 

Class I 

PSD 

Increment 

(μg/m3

) 

Is Model 

over PSD 

Increment 

level? 

98% 

Daily 

Max 

(3-yr avg) 

(μg/m3

) 

Combined 

Concentration 

(μg/m3

) 

NAAQS 

(μg/m3

) 

NAAQS 

Exceeded

? 

NO2

Annual 0.10 1 No 2.5 No

94.70 

-- 100 No 

1-hr 16.74 7.5 Yes -- -- 111.44 188 No 

Since the modeled annual NO2 concentrations for the Breton Wilderness Class I area are less than 

the significant impact level for the NO2 annual averaging period, no further action is required. 

Additionally, for the modeled hourly NO2 concentrations, when combined with an appropriate 

background monitored value, are below the NO2 1-hour-NAAQS, no further action is required. 

TABLE 6. MAXIMUM MODELED CONCENTRATIONS FOR THE ENTIRE REGION

Pollutant Averaging 

Period Receptors 

Maximum 

Modeled 

Concentration 

(μg/m3

) 

Modeling 

Significance 

Level 

(μg/m3

) 

Significant?

98% 

Daily 

Max 

(3 year 

average) 

(μg/m3

) 

Combined 

Concentration 

(μg/m3

) 

NAAQS 

(μg/m3

) 

NAAQS 

Exceeded?

NO2

Annual 1 through 

107 0.18 1.0 No N/A -- 100 No 

1-Hour 1 through 

107 29.46 7.5 Yes 94.70 124.16 188 No 

OCD MODELING CONCLUSIONS

Since the modeled annual NO2 concentrations for the entire region are less than the SIL for the 

NO2 annual averaging period, no further action is required. Additionally, for modeled hourly 

NO2 concentrations, when combined with an appropriate background monitored value, are below 

the NO2 1-hour-NAAQS, no further action is required. 
Shell Mars B Host – OCD Modeling – Page 14 

September 23, 2011 

Thank you for the opportunity to provide this evaluation. Please feel free to call me at 

(504) 828-5845 with any questions or comments. 

Sincerely, 

TRINITY CONSULTANTS 

Sharon Killian 

Principal Consultant 

Enclosures 
ATTACHMENT A: SOURCE DOCUMENTATION

Emissions Calculations and Threshold Limit Evaluation 

 
DOCD AIR QUALITY SCREENING CHECKLIST

COMPANY Shell Offshore IncARE

A MC 807

BLOCK MC 807LEASE MC 807PLATFORM Mars B HostWELL DVA wells 1-24COMPANY CONTACT Sylvia BelloneTELEPHONE NO. 504-728-7215REMARKS Mars B Olympus Construction, Production and Onboard Rig DrillingLEASE TERM PIPELINE CONSTRUCTION INFORMATION:

YEAR NUMBER OF TOTAL NUMBER OF CONSTRUCTION DAYS

PIPELINES

20102011201220132014201520162017

201820192020
AIR EMISSION CALCULATIONS

COMPANY AREA BLOCK LEASE PLATFORM WELL

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24

Emitted Substance

Year TPY

 PM SOx NOx VOC CO

2012 0.16 0.09 5.48 0.16 1.19

2013 59.76 33.74 2249.16 89.07 629.53

2014 29.31 18.67 1995.15 139.15 990.78

2015 17.52 11.91 1589.71 126.98 902.33

2016-2024 17.14 11.69 1576.58 126.59 899.46

2025-2060 16.49 11.32 1554.36 125.92 894.61

Allowable 1764.90 1764.90 1764.90 1764.90 47972.92
AIR EMISSION COMPUTATION FACTORS

Fuel Usage Conversion Factors Natural Gas Turbines Natural Gas Engines Diesel Recip. Engine RE

SCF/hp-hr 9.524 SCF/hp-hr 7.143 GAL/hp-hr 0.0483 AP42 

Equipment/Emission Factors units PM SOx NOx VOC CO RENG Turbines gms/hp-hr 0.00247 1.3 0.01 0.83 AP42 3.2-NG 2-cycle lean gms/hp-hr 0.00185 10.9 0.43 1.5 AP42 NG 4-cycle lean gms/hp-hr 0.00185 11.8 0.72 1.6 AP42 NG 4-cycle rich gms/hp-hr 0.00185 10 0.14 8.6 AP42 

Diesel Recip. < 600 hp. gms/hp-hr 1 0.1835 14 1.12 3.03 AP42 

Diesel Recip. > 600 hp. gms/hp-hr 0.32 0.1835 11 0.33 2.4 AP42 Diesel Boiler lbs/bbl 0.084 0.3025 0.84 0.008 0.21 AP42 1.3NG Heaters/Boilers/Burners lbs/mmscf 7.6 0.593 100 5.5 84 P42 1.4-1, 1NG Flares lbs/mmscf 0.593 71.4 60.3 388.5 AP42 1Liquid Flaring lbs/bbl 0.42 6.83 2 0.01 0.21 AP42 1.3-Tank Vapors lbs/bbl 0.03 E&P FFugitives lbs/hr/comp. 0.0005 API SGlycol Dehydrator Vent lbs/mmscf 6.6 La. DGas Venting lbs/scf 0.0034

Sulfur Content Source Value Units

Fuel Gas 3.33 ppm

Diesel Fuel 0.05 % weight

Produced Gas( Flares) 3.33 ppm

Produced Oil (Liquid Flaring) 1 % weight

Diesel fuel intended for locomotive, marine and non-road equipment is required to meet the Low Sulfur Diesel fuel specification of 500 ppm sulfur in 2007, per EPA regulatiohigher sulfur are not available. http://www.clean-diesel.or
AIR EMISSIONS CALCULATIONS

COMPANY AREA Purpose BLOCK LEASE PLATFORM WELL C

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24 Sylvia 

OPERATIONS EQUIPMENT RATING MAX. FUEL ACT. FUEL RUN TIME MA

Diesel Engines HP GAL/HR GAL/D

Nat. Gas Engines HP SCF/HR SCF/D

Burners MMBTU/HR SCF/HR SCF/D HR/D DAYS PM S

DRILLINGNO ACTIVITYDrillingPlatform Rig(all rig power comes from Platform power)NO ACTIVITYPIPELINEINSTALLATIONNO ACTIVITY

FACILITY Survey / Support Vessel Install 2qt 8” WB Flowlines / Manifold 13,000 627.9 15069.60 24 30 9.16 5

INSTALLATION

PRODUCTIONNO ACTIVITY

2012 YEAR TOTAL 9.16 5

EXEMPTION CALCULATION DISTANCE FROM LAND IN MILES 

53.0
AIR EMISSIONS CALCULATIONS

COMPANY AREA BLOCK LEASE PLATFORM WELL C

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24 Sy

OPERATIONS EQUIPMENT Purpose RATING MAX. FUEL % Utilization (Load Factor) ACT. FUEL RUN TIME 

Diesel Engines HP GAL/HR GAL/D

Nat. Gas Engines HP SCF/HR SCF/D

Burners MMBTU/HR SCF/HR SCF/D HR/D DAYS PM 

DrillingPlatform RigNO ACTIVITYFACILITY Tug Transport piles to site 6000 289.8 100% 6955.20 24 3 4.23 INSTALLATION Tug Transport piles to site 6000 289.8 100% 6955.20 24 3 4.23 

Tug Piles transport tugs and barges return to port 6000 289.8 100% 6955.20 24 2 4.23 

Tug Piles transport tugs and barges return to port 6000 289.8 100% 6955.20 24 2 4.23 Balder: Main Engines

Mobilize piles installation vessel to MC-810 and preparations before work begins

23628 1141.2324 100% 27389.58 24 4 16.65 

Balder: DP Engines

Mobilize piles installation vessel to MC-810 and preparations before work begins

34733 1677.6039 100% 40262.49 24 4 24.48 

Union Manta: Propulsion Engines

Mobilize piles installation vessel to MC-810 and preparations before work begins

20000 966 100% 23184.00 24 4 14.10 

Union Manta: Ships Service Generator

Mobilize piles installation vessel to MC-810 and preparations before 

work begins

1200 57.96 100% 1391.04 24 4 0.85 

work begins

Balder: DP Engines Install Piles 34733 1677.6039 100% 40262.49 24 9 24.48 

Balder: Crane Engine Install Piles 331 15.9873 100% 383.70 24 9 0.73 

Union Manta: Propulsion Engines Install Piles 20000 966 100% 23184.00 24 9 14.10 Tug Install Piles 6000 289.8 100% 6955.20 24 9 4.23 

Balder: Main Engines De-mobilize piles installation vessel from MC-810 23638 1141.7154 100% 27401.17 24 2 16.66 

Balder: DP Engines De-mobilize piles installation vessel from MC-810 34733 1677.6039 100% 40262.49 24 2 24.48 

Union Manta: Propulsion Engines De-mobilize piles installation vessel from MC-810 20000 966 100% 23184.00 24 2 14.10 

Union Manta: Ships Service Generator De-mobilize piles installation vessel from MC-810 1200 57.96 100% 1391.04 24 2 0.85 

Union Manta: Propulsion Engines Survey as-installed piles 20000 966 100% 23184.00 24 2 14.10 Tug Transport tendons and tendon support buoys to site 6000 289.8 100% 6955.20 24 3 4.23 

Tug Transport tendons and tendon support buoys to site 6000 289.8 100% 6955.20 24 3 4.23 

Tug Transport tendons and tendon support buoys to site 6000 289.8 100% 6955.20 24 3 4.23 

Tug Transport tendons and tendon support buoys to site 6000 289.8 100% 6955.20 24 3 4.23 

Tug

Tendons and tendon support buoys transport tugs and barges return to port

6000 289.8 100% 6955.20 24 2 4.23 

Tug

Tendons and tendon support buoys transport tugs and barges return to port

6000 289.8 100% 6955.20 24 2 4.23 

Tendons and tendon support buoys 

Tug transport tugs and barges return to 

port

6000 289.8 100% 6955.20 24 2 4.23 

Tug

Tendons and tendon support buoys transport tugs and barges return to port

6000 289.8 100% 6955.20 24 2 4.23 

Balder: Main Engines

Mobilize facility installation vessel to MC-810 and preparations before work begins

23638 1141.69608 100% 27400.71 24 4 16.66 

Balder: DP Engines

Mobilize facility installation vessel to MC-810 and preparations before work begins

34733 1677.59424 100% 40262.26 24 4 24.48 

Union Manta: Propulsion Engines

Mobilize facility installation vessel to MC-810 and preparations before work begins

20000 966 100% 23184.00 24 4 14.10 

Union Manta: Ships Service Generator

Mobilize facility installation vessel to MC-810 and preparations before work begins

1200 57.96 100% 1391.04 24 4 0.85 

Tug Assemble tendons 6000 289.8 100% 6955.20 24 22 4.23 

Balder: DP Engines Assemble tendons 34733 1677.6039 100% 40262.49 24 22 24.48 

Balder: Crane Engine Assemble tendons 331 15.9873 100% 383.70 24 22 0.73 

Union Manta: Propulsion Engines Assemble tendons 20000 966 100% 23184.00 24 22 14.10 

Supply Vessel Assemble tendons 3000 144.9 100% 3477.60 24 22 2.11 

Tug Wet tow host to site - open water portion of tow 18000 869.4 100% 20865.60 24 4 12.69 

Tug Wet tow host to site - open water portion of tow 18000 869.4 100% 20865.60 24 4 12.69 Tug Wet tow host to site - open water portion of tow 18000 869.4 100% 20865.60 24 4 12.69 

Balder: DP Engines Balder: DP Engines Host installation Host installation 34733 1677 6039 1677.6039 100% 40262 49 40262.49 24 10 24 48 . Balder: Crane Engine Host installation 331 15.9873 100% 383.70 24 10 0.23 

Union Manta: Propulsion Engines Host installation 20000 966 100% 23184.00 24 10 14.10 

Tug Host installation 28000 1352.4 100% 32457.60 24 10 19.74 

Tug Host offshore tow tugs return to port 18000 869.4 100% 20865.60 24 2 12.69 Tug Host offshore tow tugs return to port 18000 869.4 100% 20865.60 24 2 12.69 Tug Host offshore tow tugs return to port 18000 869.4 100% 20865.60 24 2 12.69 Tug Host positioning tugs return to port 28000 1352.4 100% 32457.60 24 2 19.74 

Tug Transport flareboom and remaining packages to site 6000 289.8 100% 6955.20 24 3 4.23 

Balder: DP Engines Completion scope (flareboom, demob, etc.) 34733 1677.6039 100% 40262.49 24 2 24.48 

Balder: Crane Engine Completion scope (flareboom, demob, etc.) 331 15.9873 100% 383.70 24 2 0.23 

Tug Completion scope (flareboom, demob, etc.) 6000 289.8 100% 6955.20 24 2 4.23 

Tug Flareboom transport tug and barge return to port 6000 289.8 100% 6955.20 24 2 4.23 

Supply Vessel Offshore hookup and commissioning 3000 144.9 100% 3477.60 24 62 2.11 
AIR EMISSIONS CALCULATIONS

COMPANY AREA BLOCK LEASE PLATFORM WELL C

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24 Sy

OPERATIONS EQUIPMENT Purpose RATING MAX. FUEL % Utilization (Load Factor) ACT. FUEL RUN TIME 

Diesel Engines HP GAL/HR GAL/D

Nat. Gas Engines HP SCF/HR SCF/D

Burners MMBTU/HR SCF/HR SCF/D HR/D DAYS PM 

West Boreas Flowline/manifold and Umbilical Installation

Install 2qt 8” WB Flowlines / Manifold Pipeline Installation Vessel 90000 4347 104328.00 24 5 63.44 

Install 2qt 8” WB Flowlines / Manifold Survey Vessel 10000 483 11592.00 24 3 7.05 

Install 2qt 8” WB Flowlines / Manifold Tug Transport Pipe to site 6000 289.8 6955.20 24 3 4.23 

Install 1 WB umbilical Umbilical Installation Vessel 13000 627.9 15069.60 24 5 9.16 Pull-In 2 qty WB flowlines + umbilical Pipeline Installation vessel 90000 4347 104328.00 24 5 63.44 

Install 2 qty flowline Jumpers Subsea Installation Vessel 13000 627.9 15069.60 24 7 9.16 

Install 2 qty well jumpers Subsea Installation Vessel 13000 627.9 15069.60 24 7 9.16 

Platform Rig UTILITY VESSEL (>600hp diesel) 3,120 151 3,617 6 91 2.20 

UTILITY VESSEL @ idle 390 19 452 18 91 0.27 

Cement Unit- Cat C15 500 24 580 24 91 1.10 

Cement Unit- Cat C15 500 24 580 24 91 1.10 

Contractor owned Knuckle Boom Pipe Handling Cranes for Mars B will be electric\hydraulic and powered from the rig's motor control center (I.e. from platform power- no separate engines)

0 0 0 0 0 0.00 

PRODUCTION Field Gas Compressor TRB-1001 15900 113,574 2,725,769 24 91 

Field Gas Compressor TRB-1051 15900 113,574 2,725,769 24 91 

Turbine Driven Generator Dual Fuel - TRB-2101 7600 54,287 1,302,883 24 91 

Turbine Driven Generator Dual Fuel TRB 2111 7600 54 287 1 302 883 24 91 

(all rig power comes from Platform power except as shown)

assume 100% 

utilization of these 

vessels

Turbine Driven Generator Dual Fuel - TRB-2111 7600 54,287 1,302,883 24 91 Turbine Driven Generator Dual Fuel - TRB-2121 7600 54,287 1,302,883 24 91 Turbine Driven Generator Dual Fuel - TRB-2131 7600 54,287 1,302,883 24 91 Turbine Driven Generator Dual Fuel - TRB-2141 7600 54,287 1,302,883 24 91 Turbine Driven Generator Dual Fuel - TRB-2151 7600 54,287 1,302,883 24 91 Turbine Driven Generator Dual Fuel - Diesel 7390 357 8,566 24 91 5.21 Essential Generator ZAN-3021 1500 72 1,739 24 2 1.06 

Emergency Generator ZAN-3020 1500 72 1,739 24 2 1.06 

Firewater Pump PBE-2331 1065 51 1,235 2 13 0.75 

Firewater Pump PBE-2351 1065 51 1,235 2 13 0.75 

Cold Start Air Compressor SKD-2020 125 6 145 4 3 0.28 

Pedestal Crane CRN 2410 920 44 1,066 4 91 0.65 Pedestal Crane CRN 2420 920 44 1,066 4 91 0.65 Pedestal Crane CRN 2430 920 44 1,066 4 91 0.65 Misc small, temporary diesel engines (welding machines, air compressors etc) 1000 48 1,159 24 91 0.70 UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 91 2.20 

UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 91 2.20 UTILITY VESSEL @ idle, generic 390 19 452 18 91 0.27 

TANKS Tank IDs BPD

Helicopter fuel tank, four ABJ-2721, ABJ-2722, ABJ,2723 91 24 91 

Hull Methanol Storage Tanks (two) w/ nitrogen blanket. One in service at a time ABJ-5160 & ABJ-5161 1400 24 91 

Hull Diesel Storage Tank ABJ-5360 3640 24 91 

Topsides methanol storage tank breathing when used w/ N2 blanket ABJ-1901 0 24 91 

Water Clarifier Tank w/N2 blanket ABJ-2601 2 24 91 

Biocide Tank w/N2 blanket ABJ-2602 20 24 91 

Scale Inhibitor Tank w/N2 blanket ABJ-2604 4 24 91 

LDHI Tank w/N2 blanket ABJ-2605 100 24 91 

Silicone Defoamer Tank w/N2 blanket ABJ-2606 10 24 91 

Asphaltene Inhibitor Tanks w/N2 blanket ABJ-2607 30 24 91 

Asphaltene Solvent Tank w/N2 blanket ABJ-2608 100 24 91 

Corrosion Inhibitor Tank w/N2 blanket ABJ-2609 11 24 91 Flourosilicone Defoamer w/N2 Blanket ABJ-2610 3 24 91 

Demulsifier Tank w/N2 blanket ABJ-2613 4 24 91 

Asphaltene Dispersant w/N2 blanket ABJ-2603 2Scale and Corrosion Inhibitor 1 w/N2 blanket ABJ-2611 and ABJ-2612 6FLARE SCF/HRZZZ-500 HP Flare - pilot gas 200 24 91 

ZZZ-500 HP Flare - purge gas nitrogen

ZZZ-500 HP Flare 18750000 10,140,000 24 18 

ZZZ-510 Atm(LP) Flare - pilot gas 100 24 91 ZZZ-510 Atm (LP) Flare - purge gas nitrogen

ZZZ-510 Atm (LP) Flare 500000 811200 24 18 MISC VENTS SCF/HRPre Sump 50 24 91 

Sump caisson 50 24 91 

Well clean up sparge tanks to atm vent pole 375 24 9 

VRUA Process Atmospheric Vent when flare isolated 1875 1014 24 2.5 VRUB Process Atmospheric Vent when flare isolated 1875 1014 24 2.5 FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 2.5 FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 2.5 

VRUA Secondary Seal Gas Atmospheric Vent VRUA Secondary Seal Gas Atmospheric Vent nitrogen nitrogenVRUB Secondary Seal Gas Atmospheric Vent nitrogenFGCA Secondary Seal Gas Atmospheric Vent nitrogenFGCB Secondary Seal Gas Atmospheric Vent nitrogenGas Lift Compressor Atmosphereic vent when flare isolated 1875 1014 24 2.5 Seal leakage vapour recovery and export gas compressors

1000 24000 24 91 

FUGITIVES COUNTFUGITIVES 12381 91 

PRODUCTIONNO ACTIVITYDRILLINGWELL TESTNO ACTIVITY

2013 YEAR TOTAL 702.94 

EXEMPTION CALCULATION DISTANCE FROM LAND IN MILES 

53.0
AIR EMISSIONS CALCULATIONS

COMPANY AREA BLOCK LEASE PLATFORM WELL 

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24 

OPERATIONS EQUIPMENT Vessel Type Number of Vessels To be Used RATING MAX. FUEL ACT. FUEL RUN TIME 

Diesel Engines HP GAL/HR GAL/D

Nat. Gas Engines HP SCF/HR SCF/D

Burners MMBTU/HR SCF/HR SCF/D HR/D DAYS PM 

West Boreas Flowlineand Umbilical Installation

Install 3 qty well jumpers Subsea Installation Vessel 1 13000 628 15,070 24 21 9.16 

Platform Rig UTILITY VESSEL (>600hp diesel) 3,120 151 3,617 6 365 2.20 

UTILITY VESSEL @ idle 390 19 452 18 365 0.27 

Cement Unit- Cat C15 500 24 580 24 21 1.10 Cement Unit- Cat C15 500 24 580 24 21 1.10 

Fract Boat 8842 427 10,250 24 3.75 6.23 

Fract Equipment 25362 1,225 29,400 3.2 3.75 17.88 

Misc small diesl engines for well work (e.g. WL power packs, pulling units, etc) 1,000 48 1,159 8 365 0.70 

Contractor owned Knuckle Boom Pipe Handling Cranes for Mars B will be electric\hydraulic and powered from the rig's motor control center (I.e. from platform power- no 

0 0 0 0 0 0.00 

PRODUCTION Field Gas Compressor TRB-1001 15900 113,574 2,725,769 24 365 

Field Gas Compressor TRB-1051 15900 113,574 2,725,769 24 365 Turbine Driven Generator Dual Fuel - TRB-2101 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - TRB-2111 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel TRB 2121 7600 54 287 1 302 883 24 365 

(all rig power comes from Platform power except as shown)

Turbine Driven Generator Dual Fuel - TRB-2121 7600 54,287 1,302,883 24 365 Turbine Driven Generator Dual Fuel - TRB-2131 7600 54,287 1,302,883 24 365 Turbine Driven Generator Dual Fuel - TRB-2141 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - TRB-2151 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - Diesel 7390 357 8,566 24 180 5.21 

Essential Generator ZAN-3021 1500 72 1,739 24 7 1.06 

Emergency Generator ZAN-3020 1500 72 1,739 24 7 1.06 

Firewater Pump PBE-2331 1065 51 1,235 2 52 0.75 

Firewater Pump PBE-2351 1065 51 1,235 2 52 0.75 

Cold Start Air Compressor SKD-2020 125 6 145 4 12 0.28 

Pedestal Crane CRN 2410 920 44 1,066 4 365 0.65 

Pedestal Crane CRN 2420 920 44 1,066 4 365 0.65 

Pedestal Crane CRN 2430 920 44 1,066 4 365 0.65 

Misc small, temporary diesel engines (welding machines, air compressors etc) 1000 48 1,159 24 365 0.70 

UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 

UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 

UTILITY VESSEL @ idle, generic 390 19 452 18 365 0.27 

TANKS Tank IDs BPDHelicopter fuel tank, four ABJ-2721, ABJ-2722, ABJ,2723 91 24 365 

Hull Methanol Storage Tanks (two) w/ nitrogen blanket. One in service at a time ABJ-5160 & ABJ-5161 1400 24 365 

Hull Diesel Storage Tank ABJ-5360 3640 24 365 Topsides methanol storage tank breathing when used w/ N2 blanket ABJ-1901 0 24 365 

Water Clarifier Tank w/N2 blanket ABJ-2601 2 24 365 

Biocide Tank w/N2 blanket Biocide Tank w/N2 blanket ABJ 2602 - 20 24 365 Scale Inhibitor Tank w/N2 blanket ABJ-2604 4 24 365 

LDHI Tank w/N2 blanket ABJ-2605 100 24 365 

Silicone Defoamer Tank w/N2 blanket ABJ-2606 10 24 365 

Asphaltene Inhibitor Tanks w/N2 blanket ABJ-2607 30 24 365 

Asphaltene Solvent Tank w/N2 blanket ABJ-2608 100 24 365 

Corrosion Inhibitor Tank w/N2 blanket ABJ-2609 11 24 365 

Flourosilicone Defoamer w/N2 Blanket ABJ-2610 3 24 365 

Demulsifier Tank w/N2 blanket ABJ-2613 4 24 365 

Asphaltene Dispersant w/N2 blanket ABJ-2603 2 24 365 

Scale and Corrosion Inhibitor 1 w/N2 blanket ABJ-2611 and ABJ-2612 6 24 365 

FLARE SCF/HRZZZ-500 HP Flare - pilot gas 200 24 365 

ZZZ-500 HP Flare - purge gas nitrogenZZZ-500 HP Flare 18,750,000.00 10,140,000 24 72 

ZZZ-510 Atm(LP) Flare - pilot gas 100 24 365 

ZZZ-510 Atm (LP) Flare - purge gas nitrogenZZZ-510 Atm (LP) Flare 500000 811200 24 72 

MISC VENTS SCF/HRPre Sump 50 24 365 

Sump caisson 50 24 365 

Well clean up sparge tanks to atm vent pole 375 24 36 VRUA Process Atmospheric Vent when flare isolated 1875 1014 24 10 

VRUB Process Atmospheric Vent when flare isolated 1875 1014 24 10 

FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 

FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 

VRUA Secondary Seal Gas Atmospheric Vent VRUA Secondary Seal Gas Atmospheric Vent nitrogen nitrogenVRUB Secondary Seal Gas Atmospheric Vent nitrogenFGCA Secondary Seal Gas Atmospheric Vent nitrogenFGCB Secondary Seal Gas Atmospheric Vent nitrogenGas Lift Compressor Atmosphereic vent when flare isolated 1875 1014 24 10 

Seal leakage vapour recovery and export gas compressors 1000 24000 24 365 

FUGITIVES COUNTFUGITIVES 12381 365 

DRILLING OIL BURN 0

WELL TEST GAS FLARE 0 

2014 YEAR TOTAL 55.08 

EXEMPTION CALCULATION DISTANCE FROM LAND IN MILES 

53.0
AIR EMISSIONS CALCULATIONS

COMPANY AREA BLOCK LEASE PLATFORM WELL CO

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24 Sylv

OPERATIONS EQUIPMENT RATING MAX. FUEL ACT. FUEL RUN TIME M

Diesel Engines HP GAL/HR GAL/D

Nat. Gas Engines HP SCF/HR SCF/D

Burners MMBTU/HR SCF/HR SCF/D HR/D DAYS PM 

West Boreas Flowlineand Umbilical Installation

Install 1 qty well jumper Subsea Installation Vessel 1 13000 628 15,070 24 7 9.16 

Platform Rig UTILITY VESSEL (>600hp diesel) 3,120 151 3,617 6 365 2.20 

UTILITY VESSEL @ idle 390 19 452 18 365 0.27 

Cement Unit- Cat C15 500 24 580 24 21 1.10 

Cement Unit- Cat C15 500 24 580 24 21 1.10 

Fract Boat 8842 427 10,250 24 2.50 6.23 

Fract Equipment 25362 1,225 29,400 3.2 2.50 17.88 

Misc smal diesl engines for well work (e.g. WL power packs, pulling 1,000 48 1,159 8 365 0.70 

Contractor owned Knuckle Boom Pipe Handling Cranes for Mars B will be electric\hydraulic and powered from the rig's motor control center (I.e. from platform power- no separate engines) 0 0 0 0 0 0.00 

PRODUCTION Field Gas Compressor TRB-1001 15900 113,574 2,725,769 24 365 

Field Gas Compressor TRB-1051 15900 113 574 2 725 769 24 365 

(all rig power comes from Platform power except as shown)

Field Gas Compressor TRB 1051 15900 113,574 2,725,769 24 365 Turbine Driven Generator Dual Fuel - TRB-2101 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - TRB-2111 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - TRB-2121 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - TRB-2131 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - TRB-2141 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - TRB-2151 7600 54,287 1,302,883 24 365 

Turbine Driven Generator Dual Fuel - Diesel 7390 357 8,566 24 18 5.21 

Essential Generator ZAN-3021 1500 72 1,739 24 7 1.06 Emergency Generator ZAN-3020 1500 72 1,739 24 7 1.06 Firewater Pump PBE-2331 1065 51 1,235 2 52 0.75 Firewater Pump PBE-2351 1065 51 1,235 2 52 0.75 Cold Start Air Compressor SKD-2020 125 6 145 4 12 0.28 

Pedestal Crane CRN 2410 920 44 1,066 4 365 0.65 

Pedestal Crane CRN 2420 920 44 1,066 4 365 0.65 

Misc small, temporary diesel engines (welding machines, air compressors etc) 1000 48 1,159 24 365 0.70 Pedestal Crane CRN 2430 920 44 1,066 4 365 0.65 

UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 

UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 

UTILITY VESSEL @ idle, generic 390 19 452 18 365 0.27 

TANKS Tank IDs BPD

Helicopter fuel tank, four ABJ-2721, ABJ-2722, ABJ,2723 91 24 365 Hull Methanol Storage Tanks (two) w/ nitrogen blanket. One in service at a time ABJ-5160 & ABJ-5161 1400 24 365 Hull Diesel Storage Tank ABJ-5360 3640 24 365 

Topsides methanol storage tank breathing when used w/ N2 ABJ 1901 0 24 365 

p gg blanket ABJ-1901 0 24 365 

Water Clarifier Tank w/N2 blanket ABJ-2601 2 24 365 

Biocide Tank w/N2 blanket ABJ-2602 20 24 365 

Scale Inhibitor Tank w/N2 blanket ABJ-2604 4 24 365 

LDHI Tank w/N2 blanket ABJ-2605 100 24 365 Silicone Defoamer Tank w/N2 blanket ABJ-2606 10 24 365 

Asphaltene Inhibitor Tanks w/N2 blanket ABJ-2607 30 24 365 Asphaltene Solvent Tank w/N2 blanket ABJ-2608 100 24 365 

Corrosion Inhibitor Tank w/N2 blanket ABJ-2609 11 24 365 Flourosilicone Defoamer w/N2 Blanket ABJ-2610 3 24 365 

Demulsifier Tank w/N2 blanket ABJ-2613 4 24 365 

Asphaltene Dispersant w/N2 blanket ABJ-2603 2 24 365 Scale and Corrosion Inhibitor 1 w/N2 blanket ABJ-2611 and ABJ-2612 6 24 365 

FLARE SCF/HR SCF/D

ZZZ-500 HP Flare - pilot gas 200 24 365 

ZZZ-500 HP Flare - purge gas nitrogen 0 0

ZZZ-500 HP Flare 18750000 10,140,000 24 72 

ZZZ-510 Atm(LP) Flare - pilot gas 100 24 365 

ZZZ-510 Atm (LP) Flare - purge gas nitrogen 0 0

ZZZ-510 Atm (LP) Flare 500000 811200 24 72 

MISC VENTS SCF/HR SCF/D

Pre Sump 50 24 365 

Sump caisson 50 24 365 Well clean up sparge tanks to atm vent pole 375 24 36 

VRUA Process Atmospheric Vent when flare isolated 1875 1014 24 10 VRUB Process Atmospheric Vent when flare isolated 1875 1014 24 10 

FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 VRUA Secondary Seal Gas Atmospheric Vent nitrogenVRUB Secondary Seal Gas Atmospheric Vent nitrogenFGCA Secondary Seal Gas Atmospheric Vent nitrogenFGCB Secondary Seal Gas Atmospheric Vent nitrogenGas Lift Compressor Atmosphereic vent when flare isolated 1875 1014 24 10 Seal leakage vapour recovery and export gas compressors 1000 24000 24 365 

FUGITIVES COUNTFUGITIVES 12381 365 

DRILLING OIL BURN 0 0 0 0.00 

WELL TEST GAS FLARE 0 0 0 

2015 YEAR TOTAL 55.08 

EXEMPTION 

CALCULATION DISTANCE FROM LAND IN MILES 
AIR EMISSIONS CALCULATIONS

COMPANY AREA BLOCK LEASE PLATFORM WELL CONTACT 

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24 Sylvia Bellone 5

OPERATIONS EQUIPMENT RATING MAX. FUEL ACT. FUEL RUN TIME MAXIMUM POUNDS PE

Diesel Engines HP GAL/HR GAL/D

Nat. Gas Engines HP SCF/HR SCF/D

Burners MMBTU/HR SCF/HR SCF/D HR/D DAYS PM SOx NOx 

Platform Rig UTILITY VESSEL (>600hp diesel) 3,120 151 3,617 6 365 2.20 1.26 75.59 

UTILITY VESSEL @ idle 390 19 452 18 365 0.27 0.16 9.45 

Cement Unit- Cat C15 500 24 580 24 21 1.10 0.20 15.42 

Cement Unit- Cat C15 500 24 580 24 21 1.10 0.20 15.42 

Fract Boat 8,842 427 10,250 24.00 6.25 6.23 3.57 214.23 

Fract Equipment 25,362 1,225 29,400 3.20 6.25 17.88 10.25 614.50 

Misc smal diesl engines for well work (e.g. WL power packs, pulling 1,000 48 1,159 8 365 0.70 0.40 24.23 

Contractor owned Knuckle Boom Pipe Handling Cranes for Mars B 

will be electric\hydraulic and powered from the rig's motor control center (I.e. from platform power- no separate engines) 0 0 0 0 0 0.00 0.00 0.00 

PRODUCTION Field Gas Compressor TRB-1001 15900 113,574 2,725,769 24 365 0.09 45.53 

Field Gas Compressor TRB-1051 15900 113,574 2,725,769 24 365 0.09 45.53 Turbine Driven Generator Dual Fuel - TRB-2101 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2111 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2121 7600 54,287 1,302,883 24 365 0.04 21.76 

(all rig power comes from Platform power except as shown)

, , ,

Turbine Driven Generator Dual Fuel - TRB-2131 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2141 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2151 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - Diesel 7390 357 8,566 24 18 5.21 2.99 179.05 

Essential Generator ZAN-3021 1500 72 1,739 24 7 1.06 0.61 36.34 

Emergency Generator ZAN-3020 1500 72 1,739 24 7 1.06 0.61 36.34 

Firewater Pump PBE-2331 1065 51 1,235 2 52 0.75 0.43 25.80 

Firewater Pump PBE-2351 1065 51 1,235 2 52 0.75 0.43 25.80 Cold Start Air Compressor SKD-2020 125 6 145 4 12 0.28 0.05 3.85 Pedestal Crane CRN 2410 920 44 1,066 4 365 0.65 0.37 22.29 

Pedestal Crane CRN 2420 920 44 1,066 4 365 0.65 0.37 22.29 

Pedestal Crane CRN 2430 920 44 1,066 4 365 0.65 0.37 22.29 

Misc small, temporary diesel engines (welding machines, air compressors etc) 1000 48 1,159 24 365 0.70 0.40 24.23 

UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 1.26 75.59 UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 1.26 75.59 UTILITY VESSEL @ idle, generic 390 19 452 18 365 0.27 0.16 9.45 

TANKS BPD Tank IDs

Helicopter fuel tank, four 91 ABJ-2721, ABJ-2722, ABJ,2723 24 365 

Hull Methanol Storage Tanks (two) w/ nitrogen blanket. One in service at a time 1400 ABJ-5160 & ABJ-5161 24 365 Hull Diesel Storage Tank 3640 ABJ-5360 24 365 

Topsides methanol storage tank breathing when used w/ N2 blanket 0 ABJ-1901 24 365 

Water Clarifier Tank w/N2 blanket 2 ABJ-2601 24 365 

Biocide Tank w/N2 blanket 20 ABJ-2602 24 365 

Scale Inhibitor Tank w/N2 blanket 4 ABJ-2604 24 365 LDHI Tank w/N2 blanket 100 ABJ-2605 24 365 

Silicone Defoamer Tank w/N2 blanket 10 ABJ-2606 24 365 

Asphaltene Inhibitor Tanks w/N2 blanket 30 ABJ-2607 24 365 Asphaltene Solvent Tank w/N2 blanket 100 ABJ-2608 24 365 Corrosion Inhibitor Tank w/N2 blanket 11 ABJ-2609 24 365 Flourosilicone Defoamer w/N2 Blanket 3 ABJ-2610 24 365 Demulsifier Tank w/N2 blanket 4 ABJ-2613 24 365 Asphaltene Dispersant w/N2 blanket 2 ABJ-2603 24 365 Scale and Corrosion Inhibitor 1 w/N2 blanket 6 ABJ-2611 and ABJ-2612 24 365 

FLARE SCF/HR SCF/D

ZZZ-500 HP Flare - pilot gas 200 24 365 0.00 0.01 

ZZZ-500 HP Flare - purge gas nitrogen 0 0

ZZZ-500 HP Flare 18750000 10,140,000 24 72 11.12 1338.75 ZZZ-510 Atm(LP) Flare - pilot gas 100 24 365 0.00 0.01 

ZZZ-510 Atm (LP) Flare - purge gas nitrogen 0 0

ZZZ-510 Atm (LP) Flare 500000 811200 24 72 0.30 35.70 MISC VENTS SCF/HR SCF/D

Pre Sump 50 24 365 

Sump caisson 50 24 365 

Well clean up sparge tanks to atm vent pole 375 24 36 VRUA Process Atmospheric Vent when flare isolated 1875 1014 24 10 VRUB Process Atmospheric Vent when flare isolated 1875 1014 24 10 FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 

FGCA Process Atmospheric Vent when flare isolated FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 VRUA Secondary Seal Gas Atmospheric Vent nitrogen

VRUB Secondary Seal Gas Atmospheric Vent nitrogenFGCA Secondary Seal Gas Atmospheric Vent nitrogenFGCB Secondary Seal Gas Atmospheric Vent nitrogenGas Lift Compressor Atmosphereic vent when flare isolated 1875 1014 24 10 

Seal leakage vapour recovery and export gas compressors 1000 24000 24 365 

FUGITIVES COUNTFUGITIVES 12381 365 

DRILLING OIL BURN 0 0 0 0.00 0.00 0.00 

WELL TEST GAS FLARE 0 0 0 0.00 0.00 

2016-2024 YEAR TOTAL 45.91 37.20 3123.89 

EXEMPTION 

CALCULATION DISTANCE FROM LAND IN MILES 

53.0
AIR EMISSIONS CALCULATIONS

COMPANY AREA BLOCK LEASE PLATFORM WELL CONTACT 

Shell Offshore Inc MC 807 MC 807 MC 807 Mars B Host DVA wells 1-24 Sylvia Bellone 5

OPERATIONS EQUIPMENT RATING MAX. FUEL ACT. FUEL RUN TIME MAXIMUM POUNDS PE

Diesel Engines HP GAL/HR GAL/D

Nat. Gas Engines HP SCF/HR SCF/D

Burners MMBTU/HR SCF/HR SCF/D HR/D DAYS PM SOx NOx 

Platform Rig UTILITY VESSEL (>600hp diesel) 3,120 151 3,617 6 365 2.20 1.26 75.59 

UTILITY VESSEL @ idle 390 19 452 18 365 0.27 0.16 9.45 Cement Unit- Cat C15 500 24 580 24 21 1.10 0.20 15.42 

Cement Unit- Cat C15 500 24 580 24 21 1.10 0.20 15.42 

Misc smal diesl engines for well work (e.g. WL power packs, pulling 1,000 48 1,159 8 365 0.70 0.40 24.23 

Contractor owned Knuckle Boom Pipe Handling Cranes for Mars B will be electric\hydraulic and powered from the rig's motor control center (I.e. from platform power- no separate engines) 0 0 0 0 0 0.00 0.00 0.00 

PRODUCTION Field Gas Compressor TRB-1001 15900 113,574 2,725,769 24 365 0.09 45.53 

Field Gas Compressor TRB-1051 15900 113,574 2,725,769 24 365 0.09 45.53 Turbine Driven Generator Dual Fuel - TRB-2101 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2111 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2121 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2131 7600 54,287 1,302,883 24 365 0.04 21.76 

Turbine Driven Generator Dual Fuel - TRB-2141 7600 54,287 1,302,883 24 365 0.04 21.76 

(all rig power comes from Platform power except as shown)

Turbine Driven Generator Dual Fuel TRB 2141 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - TRB-2151 7600 54,287 1,302,883 24 365 0.04 21.76 Turbine Driven Generator Dual Fuel - Diesel 7390 357 8,566 24 18 5.21 2.99 179.05 Essential Generator ZAN-3021 1500 72 1,739 24 7 1.06 0.61 36.34 Emergency Generator ZAN-3020 1500 72 1,739 24 7 1.06 0.61 36.34 Firewater Pump PBE-2331 1065 51 1,235 2 52 0.75 0.43 25.80 Firewater Pump PBE-2351 1065 51 1,235 2 52 0.75 0.43 25.80 Cold Start Air Compressor SKD-2020 125 6 145 4 12 0.28 0.05 3.85 Pedestal Crane CRN 2410 920 44 1,066 4 365 0.65 0.37 22.29 Pedestal Crane CRN 2420 920 44 1,066 4 365 0.65 0.37 22.29 Pedestal Crane CRN 2430 920 44 1,066 4 365 0.65 0.37 22.29 Misc small, temporary diesel engines (welding machines, air compressors etc) 1000 48 1,159 24 365 0.70 0.40 24.23 UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 1.26 75.59 

UTILITY VESSEL (>600hp diesel), generic 3,120 151 3,617 6 365 2.20 1.26 75.59 

UTILITY VESSEL @ idle, generic 390 19 452 18 365 0.27 0.16 9.45 

TANKS BPD Tank IDsHelicopter fuel tank, four 91 ABJ-2721, ABJ-2722, ABJ,2723 24 365 

Hull Methanol Storage Tanks (two) w/ nitrogen blanket. One in service at a time 1400 ABJ-5160 & ABJ-5161 24 365 Hull Diesel Storage Tank 3640 ABJ-5360 24 365 Topsides methanol storage tank breathing when used w/ N2 blanket 0 ABJ-1901 24 365 Water Clarifier Tank w/N2 blanket 2 ABJ-2601 24 365 Biocide Tank w/N2 blanket 20 ABJ-2602 24 365 

Scale Inhibitor Tank w/N2 blanket Scale Inhibitor Tank w/N2 blanket 4 ABJ-2604 24 365 LDHI Tank w/N2 blanket 100 ABJ-2605 24 365 Silicone Defoamer Tank w/N2 blanket 10 ABJ-2606 24 365 Asphaltene Inhibitor Tanks w/N2 blanket 30 ABJ-2607 24 365 Asphaltene Solvent Tank w/N2 blanket 100 ABJ-2608 24 365 Corrosion Inhibitor Tank w/N2 blanket 11 ABJ-2609 24 365 Flourosilicone Defoamer w/N2 Blanket 3 ABJ-2610 24 365 Demulsifier Tank w/N2 blanket 4 ABJ-2613 24 365 Asphaltene Dispersant w/N2 blanket 2 ABJ-2603 24 365 Scale and Corrosion Inhibitor 1 w/N2 blanket 6 ABJ-2611 and ABJ-2612 24 365 FLARE SCF/HR SCF/DZZZ-500 HP Flare - pilot gas 200 24 365 0.00 0.01 ZZZ-500 HP Flare - purge gas nitrogen 0 0ZZZ-500 HP Flare 18750000 10,140,000 24 72 11.12 1338.75 ZZZ-510 Atm(LP) Flare - pilot gas 100 24 365 0.00 0.01 ZZZ-510 Atm (LP) Flare - purge gas nitrogen 0 0ZZZ-510 Atm (LP) Flare 500000 811200 24 72 0.30 35.70 MISC VENTS SCF/HR SCF/DPre Sump 50 24 365 Sump caisson 50 24 365 Well clean up sparge tanks to atm vent pole 375 24 36 VRUA Process Atmospheric Vent when flare isolated 1875 1014 24 10 VRUB Process Atmospheric Vent when flare isolated 1875 1014 24 10 FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 FGCA Process Atmospheric Vent when flare isolated 1875 1014 24 10 VRUA Secondary Seal Gas Atmospheric Vent VRUA Secondary Seal Gas Atmospheric Vent nitrogen nitrogenVRUB Secondary Seal Gas Atmospheric Vent nitrogenFGCA Secondary Seal Gas Atmospheric Vent nitrogenFGCB Secondary Seal Gas Atmospheric Vent nitrogenGas Lift Compressor Atmosphereic vent when flare isolated 1875 1014 24 10 Seal leakage vapour recovery and export gas compressors 1000 24000 24 365 FUGITIVES COUNTFUGITIVES 12381 365 

DRILLING OIL BURN 0 0 0 0.00 0.00 0.00 WELL TEST GAS FLARE 0 0 0 0.00 0.00 

2025-2060 YEAR TOTAL 21.80 23.38 2295.15 

EXEMPTION 

CALCULATION DISTANCE FROM LAND IN MILES 

53.0
ATTACHMENT B: OCD MODELING FILES

Provided Electronically on Attached CD 
ATTACHMENT C: MODELING RESULTS FOR THE ENTIRE REGION
Table C-2. Shell Offshore, Inc. - OCD Modeling Results

Mars B Host Operations

300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m

B1+ 29.4851 -89.1701 16.3 16.3 16.3 5.96 5.62 5.62 16.3 16.3 16.3 16.3 16.3 16.3 16.3 16.3 16.3

B2+ 29.4623 -89.2030 16.74 16.74 16.74 6.12 6.11 6.11 16.74 16.74 16.74 16.74 16.74 16.74 16.74 16.74 16.74

C1+ 29.9088 -88.8219 4.41 3.96 3.96 7.02 7.02 7.02 11.39 11.39 11.39 8.7 8.7 8.7 4.78 4.78 4.78

C2+ 29.9524 -88.8261 4.36 4.3 4.3 6.63 6.63 6.63 11.4 11.4 11.4 8.45 8.45 8.45 4.54 4.54 4.54

C3+ 29.8669 -88.8371 4.54 4.23 4.23 7.12 7.12 7.12 11.79 11.79 11.79 8.91 8.91 8.91 4.88 4.88 4.88

C4+ 29.8345 -88.8373 4.59 4.04 4.04 7.38 7.38 7.38 11.84 11.84 11.84 9.09 9.09 9.09 5 5 5

C5+ 29.7925 -88.8604 4.77 4.61 4.61 7.35 7.35 7.35 12.46 12.46 12.46 9.3 9.3 9.3 5.04 5.04 5.04

R1 29.0003 -89.3673 23.18 23.18 23.18 9.98 9.98 9.98 15.02 15.02 15.02 17.07 17.07 17.07 11.24 11.24 11.24

R10 29.0048 -89.1778 26.14 26.14 26.14 8.88 6.15 6.15 24.57 24.57 24.57 24.57 24.57 24.57 24.57 24.57 24.57

R11 28.9900 -89.1422 24.58 24.58 24.58 9.44 5.08 5.08 20.08 20.08 20.08 21.46 21.46 21.46 19.71 19.71 19.71

R12 29.0749 -89.1185 20.8 20.8 20.8 8.68 4.44 4.42 19.94 19.94 19.94 19.68 19.68 19.68 15.82 15.82 15.82

R13 29.0528 -89.1568 24.36 24.36 24.36 8.21 4.8 4.79 21.34 21.34 21.34 21.34 21.34 21.34 21.34 21.34 21.34

R14 29.0887 -89.0727 14.58 14.58 14.58 8.54 8.54 8.54 23.15 23.15 23.15 17.74 17.74 17.74 9.38 9.38 9.38

R15 29.1338 -89.0453 11.38 11.38 11.38 10.09 10.09 10.09 22.27 22.27 22.27 15.37 15.37 15.37 9.38 9.38 9.38

R16 29.1791 -89.0052 7.65 7.53 7.53 11.87 11.87 11.87 20.22 20.22 20.22 15.05 15.05 15.05 8.11 8.11 8.11

R17 29.2150 -89.0270 10.28 10.28 10.28 9.44 9.44 9.44 20.5 20.5 20.5 14.01 14.01 14.01 8.62 8.62 8.62

R18 29.2967 -89.1575 19.25 19.25 19.25 6.63 4.66 4.66 18.18 18.18 18.18 18.18 18.18 18.18 18.18 18.18 18.18

R19 29.3382 -89.1836 18.49 18.49 18.49 6.75 6.63 6.63 18.49 18.49 18.49 18.49 18.49 18.49 18.49 18.49 18.49

R2 28.9636 -89.4025 * 27.14 * 27.14 * 27.14 9.6 5.57 5.46 17.81 17.81 17.81 20.15 20.15 20.15 11.47 11.47 11.47

R20 29.3495 -89.2666 15.72 15.72 15.72 6.73 3.37 3.35 15.72 15.72 15.72 15.72 15.72 15.72 15.72 15.72 15.72

R21 29.3881 -89.3120 11.8 11.8 11.8 6.5 4.04 4.04 11.8 11.8 11.8 12.54 12.54 12.54 11.8 11.8 11.8

R22 29.2529 -89.1174 18.9 18.9 18.9 7.09 3.55 3.38 15.48 15.48 15.48 15.99 15.99 15.99 15.48 15.48 15.48

R23 29.7637 -89.2865 11.17 11.17 11.17 4.98 2.49 2.15 11.17 11.17 11.17 11.17 11.17 11.17 11.17 11.17 11.17

R24 29.0430 -89.3525 19.27 19.27 19.27 10.84 10.84 10.84 12.31 12.31 12.31 17.77 17.77 17.77 13 13 13

R25 30.3367 -89.1708 9.94 9.94 9.94 3.68 3.68 3.68 9.94 9.94 9.94 9.94 9.94 9.94 9.94 9.94 9.94

R26 29.0826 -89.3137 12.86 12.86 12.86 8.54 7.76 7.76 13.41 13.41 13.41 17.14 17.14 17.14 14.4 14.4 14.4

R27 29.1272 -89.3603 17.17 17.17 17.17 9.91 9.91 9.91 10.94 10.94 10.94 16.31 16.31 16.31 12.07 12.07 12.07

R28 29.1564 -89.3973 19.95 19.95 19.95 7.87 7.87 7.87 12.97 12.97 12.97 13.87 13.87 13.87 8.86 8.86 8.86

R29 29.1875 -89.4501 7.88 7.88 7.88 3.94 4.06 3.94 11.62 11.6 11.6 15.37 15.37 15.37 10 10 10

R3 28.9287 -89.4210 27.06 27.06 27.06 10.14 8.99 8.99 20.83 20.83 20.83 25.36 25.36 25.36 14.28 14.28 14.28

R30 30.3560 -89.1167 9.71 9.71 9.71 3.58 3.26 3.26 9.71 9.71 9.71 9.71 9.71 9.71 9.71 9.71 9.71

R31 29.2342 -89.4950 4.42 4.42 4.42 6.94 6.94 6.94 8.51 8.51 8.51 14.01 14.01 14.01 12.18 12.18 12.18

R32 29.2424 -89.5571 14.19 14.19 14.19 9.54 9.54 9.54 17.4 17.4 17.4 19.62 19.62 19.62 11.02 11.02 11.02

R33 29.2544 -89.6062 10.42 10.42 10.42 11.29 11.29 11.29 17.99 17.99 17.99 17.64 17.64 17.64 10.53 10.53 10.53

R34 29.2838 -89.6352 9.79 9.79 9.79 11.14 11.14 11.14 17.16 17.16 17.16 15.9 15.9 15.9 9.68 9.68 9.68

R35 29.2950 -89.6813 7.79 7.79 7.79 10.13 10.13 10.13 15.07 15.07 15.07 12.38 12.38 12.38 12.99 12.99 12.99

R36 29.3057 -89.7325 6.5 4.92 4.92 8.98 8.98 8.98 13.78 13.78 13.78 11.31 11.31 11.31 15.94 15.94 15.94

R37 29.3129 -89.7805 6.26 3.13 2.65 8.57 8.57 8.57 13.27 13.27 13.27 11.87 11.87 11.87 17.33 17.33 17.33

R38 29.3192 -89.8416 6.27 3.14 2.57 12.06 12.06 12.06 11.48 11.48 11.48 10.02 10.02 10.02 16.68 16.68 16.68

R39 29.3063 -89.8803 6.26 3.13 2.75 14.27 14.27 14.27 14.4 14.4 14.4 8.96 8.96 8.96 14.73 14.73 14.73

R4 28.9530 -89.3799 26.76 26.76 26.76 9.65 7.65 7.65 17.5 17.5 17.5 16.57 16.57 16.57 10.96 10.96 10.96

R40 29.2830 -89.9251 6.28 3.14 2.42 * 15.49 * 15.49 * 15.49 16.82 16.82 16.82 10.83 10.83 10.83 11.07 11.07 11.07

R41 30.2407 -88.7347 3.69 3.18 3.18 5.94 5.94 5.94 9.45 9.45 9.45 7.29 7.29 7.29 4.01 4.01 4.01

R42 30.2334 -88.6836 3.61 2.18 2.18 6.1 6.1 6.1 8.41 8.41 8.41 6.99 6.99 6.99 3.65 3.29 3.29

R43 30.2264 -88.6337 3.73 1.86 1.8 5.69 5.69 5.69 7.13 7.13 7.13 7.04 7.04 7.04 4.19 4.19 4.19

R44 30.2123 -88.5057 4.22 4.22 4.22 3.71 3.16 3.16 3.77 3.77 3.77 8.52 8.52 8.52 4.05 4.05 4.05

R45 30.1981 -88.4514 4.77 4.77 4.77 3.71 2.04 2.04 3.68 2.58 2.58 9.34 9.34 9.34 4 4 4

R46 30.2287 -88.3314 5.12 5.12 5.12 3.54 1.77 1.18 3.97 3.97 3.97 9.18 9.18 9.18 4.88 4.88 4.88

R47 30.2334 -88.2799 4.87 4.87 4.87 3.58 1.79 1.19 4.67 4.67 4.67 8.59 8.59 8.59 4.53 4.53 4.53

R48 30.2426 -88.2289 4.33 4.33 4.33 3.54 1.77 1.18 5.17 5.17 5.17 7.8 7.8 7.8 3.75 3.75 3.75

R49 30.2490 -88.1776 3.61 3.61 3.61 3.44 1.72 1.15 5.5 5.5 5.5 7.85 7.85 7.85 3.5 2.79 2.79

R5 28.9880 -89.3502 21.37 21.37 21.37 11.4 11.4 11.4 13.71 13.71 13.71 18.68 18.68 18.68 13.34 13.34 13.34

R50 30.2429 -88.1249 3.48 2.71 2.71 3.42 1.71 1.14 5.62 5.62 5.62 7.65 7.65 7.65 3.42 1.76 1.76

R51 30.2179 -88.0981 3.45 2.11 2.11 3.49 1.75 1.17 5.56 5.56 5.56 7.38 7.38 7.38 3.49 2.23 2.23

R52 30.2254 -88.0262 3.23 2.23 2.23 3.4 1.7 1.13 4.99 4.99 4.99 6.47 6.47 6.47 3.44 3.39 3.39

R53 30.2295 -87.9749 3.35 3 3 3.41 1.7 1.15 4.4 4.4 4.4 5.68 5.68 5.68 3.68 3.68 3.68

R54 30.2312 -87.9224 3.64 3.64 3.64 3.37 1.69 1.15 3.71 3.71 3.71 4.82 4.82 4.82 3.95 3.95 3.95

R55 30.2293 -87.8697 3.88 3.88 3.88 3.29 1.64 1.12 3.34 2.98 2.98 5.26 5.26 5.26 4.22 4.22 4.22

R56 30.3789 -89.0398 9.67 9.67 9.67 3.24 1.62 1.52 8.61 8.61 8.61 8.61 8.61 8.61 8.61 8.61 8.61

R57 30.3905 -88.9739 8.96 8.96 8.96 3.51 1.76 1.19 7.29 7.29 7.29 7.81 7.81 7.81 7.2 7.2 7.2

R58 30.0506 -89.1956 11.39 11.39 11.39 4.2 4.02 4.02 11.39 11.39 11.39 11.39 11.39 11.39 11.39 11.39 11.39

R59 30.2497 -87.6604 5.81 5.81 5.81 3.19 1.59 1.53 3.16 1.87 1.87 6.75 6.75 6.75 4.17 4.17 4.17

R6 29.0187 -89.3147 14.1 14.1 14.1 9.19 9.13 9.13 14.11 14.11 14.11 18.7 18.7 18.7 15.49 15.49 15.49

R60 29.0452 -90.7606 4.68 2.34 1.87 8.42 8.42 8.42 12.24 12.24 12.24 12 12 12 4.98 4.59 4.59

R61 29.0549 -90.7036 5.05 2.52 1.71 9.5 9.5 9.5 12.17 12.17 12.17 12.51 12.51 12.51 5.09 2.9 2.9

R62 29.0891 -90.5456 5.39 4.45 4.45 13.22 13.22 13.22 7.9 7.9 7.9 9.41 9.41 9.41 5.39 2.7 1.82

R63 29.0584 -90.4559 5.95 5.95 5.95 14.05 14.05 14.05 6.72 6.72 6.72 8.83 8.83 8.83 5.7 2.85 2.19

R64 29.0659 -90.3210 5.98 5.97 5.97 11.31 11.31 11.31 6.09 3.66 3.66 10.17 10.17 10.17 6.09 5.6 5.6

R65 29.0860 -90.2228 6.25 3.13 2.51 10.17 10.17 10.17 8.47 8.47 8.47 14.05 14.05 14.05 11.06 11.06 11.06

R66 29.1089 -90.1794 6.34 3.27 3.23 9.94 9.94 9.94 10.88 10.88 10.88 13.87 13.87 13.87 13.52 13.52 13.52

R67 29.1330 -90.1383 6.37 3.19 3.14 7.84 7.84 7.84 11.69 11.69 11.69 11.88 11.88 11.88 14.32 14.32 14.32

R68 29.1598 -90.0977 6.38 3.19 2.49 9.33 9.33 9.33 10.42 10.42 10.42 13.59 13.59 13.59 13.08 13.08 13.08

R69 29.1867 -90.0546 6.18 3.09 2.16 11.95 11.95 11.95 9.91 9.91 9.91 16.67 16.67 16.67 10.15 10.15 10.15

R7 29.0549 -89.2832 17.75 17.75 17.75 8.85 4.51 4.51 17.75 17.75 17.75 17.75 17.75 17.75 17.75 17.75 17.75

R70 29.2253 -90.0056 6.35 3.17 2.41 12.31 12.31 12.31 14.75 14.75 14.75 17.05 17.05 17.05 6.35 5.92 5.92

R71 29.2511 -89.9598 6.26 3.13 2.14 14.72 14.72 14.72 17.12 17.12 17.12 14.5 14.5 14.5 7.47 7.47 7.47

R72 30.3605 -88.8188 5.56 5.56 5.56 3.92 3.92 3.92 9.68 9.68 9.68 7.09 7.09 7.09 4.04 4.04 4.04

R73 30.2628 -87.6065 6.39 6.39 6.39 3.14 2.04 2.04 3.14 2.37 2.37 7.25 7.25 7.25 4.22 4.22 4.22

R74 30.2290 -87.8182 4.24 4.24 4.24 3.31 1.66 1.1 3.31 2.33 2.33 5.69 5.69 5.69 3.95 3.95 3.95

R75 30.2364 -87.7659 4.4 4.4 4.4 3.24 1.62 1.08 3.27 1.8 1.8 5.82 5.82 5.82 3.35 3.35 3.35

R76 30.2431 -87.7150 5.06 5.06 5.06 3.22 1.61 1.07 3.22 1.61 1.37 6.06 6.06 6.06 3.83 3.83 3.83

R77 30.3047 -89.2769 8.86 8.86 8.86 3.73 1.86 1.49 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86 8.86

R78 30.3218 -89.2231 9.65 9.65 9.65 3.56 2.79 2.79 9.65 9.65 9.65 9.65 9.65 9.65 9.65 9.65 9.65

R8 29.0826 -89.2429 22.25 22.25 22.25 8.52 5.24 5.24 22.25 22.25 22.25 22.25 22.25 22.25 22.25 22.25 22.25

R9 29.0275 -89.2209 25.24 25.24 25.24 9.13 8.77 8.77 * 25.24 * 25.24 * 25.24 25.24 25.24 25.24 * 25.24 * 25.24 * 25.24

R79 29.0450 -90.8159 4.76 2.38 1.92 7.26 7.26 7.26 11.73 11.73 11.73 11.13 11.13 11.13 5.04 5.04 5.04

R80 29.0531 -90.8637 4.72 2.36 1.83 6.47 6.47 6.47 11.18 11.18 11.18 10.41 10.41 10.41 4.78 4.78 4.78

R81 29.0481 -90.9178 4.62 2.31 1.57 5.16 5.16 5.16 10.21 10.21 10.21 9.18 9.18 9.18 4.62 3.73 3.73

R82 29.0660 -90.9576 4.52 2.26 1.51 4.95 4.95 4.95 9.91 9.91 9.91 8.88 8.88 8.88 4.51 3.54 3.54

R83 29.1742 -91.0085 4.1 2.05 1.56 7 7 7 10.52 10.52 10.52 10.2 10.2 10.2 4.3 4.23 4.23

R84 29.1836 -91.0620 4.11 2.05 1.55 6.35 6.35 6.35 10.15 10.15 10.15 9.66 9.66 9.66 4.35 4.35 4.35

R85 29.2040 -91.1063 4.03 2.02 1.5 6.11 6.11 6.11 9.89 9.89 9.89 9.38 9.38 9.38 4.26 4.26 4.26

R86 29.2220 -91.1515 3.97 1.98 1.45 5.82 5.82 5.82 9.61 9.61 9.61 9.06 9.06 9.06 4.16 4.16 4.16

R87 29.2246 -91.2011 3.94 1.97 1.37 5.13 5.13 5.13 9.15 9.15 9.15 8.44 8.44 8.44 3.94 3.83 3.83

R88 29.2391 -91.2479 3.86 1.93 1.29 4.78 4.78 4.78 8.81 8.81 8.81 8.06 8.06 8.06 3.86 3.57 3.57

R89 29.2589 -91.2920 3.78 1.89 1.26 4.61 4.61 4.61 8.58 8.58 8.58 7.83 7.83 7.83 3.78 3.43 3.43

R90 29.2916 -91.3251 3.7 1.85 1.25 4.85 4.85 4.85 8.62 8.62 8.62 7.96 7.96 7.96 3.7 3.62 3.62

R91 28.8860 -89.4362 24.69 24.69 24.69 12.94 12.94 12.94 24.27 24.27 24.27 * 29.46 * 29.46 * 29.46 15.53 15.53 15.53

R92 30.2733 -87.5576 6.87 6.87 6.87 3.08 2.52 2.52 3.1 2.82 2.82 7.6 7.6 7.6 4.06 4.06 4.06

R93 30.2812 -87.5080 7.29 7.29 7.29 3.04 2.98 2.98 3.23 3.23 3.23 7.88 7.88 7.88 3.73 3.73 3.73

R94 30.2915 -87.4594 7.58 7.58 7.58 3.3 3.3 3.3 3.5 3.5 3.5 8.02 8.02 8.02 3.32 3.32 3.32

R95 30.2991 -87.4104 7.79 7.79 7.79 3.48 3.48 3.48 3.64 3.64 3.64 8.06 8.06 8.06 2.89 2.82 2.82

R96 30.3101 -87.3627 7.87 7.87 7.87 3.47 3.47 3.47 3.63 3.63 3.63 7.98 7.98 7.98 2.91 2.37 2.37

R97 30.3208 -87.3140 7.87 7.87 7.87 3.32 3.32 3.32 3.49 3.49 3.49 7.81 7.81 7.81 2.91 1.93 1.93

R98 30.3171 -87.2631 7.78 7.78 7.78 2.94 2.94 2.94 3.16 3.16 3.16 7.52 7.52 7.52 2.88 1.44 1.4

R99 30.3216 -87.2131 7.56 7.56 7.56 2.67 2.5 2.5 2.81 2.76 2.76 7.14 7.14 7.14 2.86 1.48 1.48

R100 30.3276 -87.1632 7.25 7.25 7.25 2.74 2.05 2.05 2.82 2.34 2.34 6.71 6.71 6.71 2.82 1.89 1.89

+ Represents Class I Area receptor.

* Represents maximum 1-hr average concentration corresponding to the meteorological year and mixing height represented for each column.

Receptor Lat, dd Lon, dd

2000 2001 2004

2000, 2001, 2002, 2003 and 2004 Meteorology - 300m, 600m, 900m Mixing Heights

OCD5 Predicted 1-hr Average NO2 Concentrations - μg/m3

2002 2003

September 2011
Table C-1. Shell Offshore, Inc. - OCD Modeling Results

Mars B Host Operations

300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m

B1+ 29.4851 -89.1701 0.1 0.06 0.05 0.07 0.04 0.03 0.12 0.07 0.06 0.1 0.07 0.06 0.08 0.05 0.04

B2+ 29.4623 -89.2030 0.1 0.06 0.05 0.07 0.04 0.04 0.12 0.07 0.06 0.1 0.07 0.06 0.09 0.05 0.04

C1+ 29.9088 -88.8219 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

C2+ 29.9524 -88.8261 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

C3+ 29.8669 -88.8371 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

C4+ 29.8345 -88.8373 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

C5+ 29.7925 -88.8604 0.06 0.03 0.03 0.05 0.03 0.02 0.06 0.04 0.03 0.05 0.03 0.03 0.05 0.03 0.02

R1 29.0003 -89.3673 0.13 0.08 0.07 0.11 0.06 0.06 0.14 0.09 0.08 0.11 0.08 0.07 0.12 0.08 0.07

R10 29.0048 -89.1778 0.15 0.09 0.08 0.12 0.07 0.07 * 0.18 * 0.11 * 0.10 * 0.17 * 0.11 * 0.10 0.13 0.08 0.07

R11 28.9900 -89.1422 0.13 0.08 0.07 0.13 0.08 0.07 0.17 0.1 0.09 0.16 0.11 0.1 0.13 0.08 0.07

R12 29.0749 -89.1185 0.12 0.07 0.06 0.12 0.07 0.06 0.14 0.09 0.08 0.14 0.09 0.08 0.11 0.07 0.06

R13 29.0528 -89.1568 0.13 0.08 0.07 0.11 0.07 0.06 0.16 0.1 0.09 0.16 0.1 0.09 0.12 0.07 0.06

R14 29.0887 -89.0727 0.11 0.07 0.06 0.11 0.06 0.06 0.12 0.07 0.06 0.11 0.07 0.07 0.1 0.06 0.05

R15 29.1338 -89.0453 0.1 0.06 0.05 0.09 0.06 0.05 0.11 0.07 0.06 0.1 0.06 0.06 0.09 0.06 0.05

R16 29.1791 -89.0052 0.09 0.05 0.05 0.08 0.05 0.04 0.1 0.06 0.05 0.08 0.05 0.05 0.08 0.05 0.04

R17 29.2150 -89.0270 0.09 0.06 0.05 0.09 0.05 0.05 0.1 0.06 0.05 0.09 0.06 0.05 0.08 0.05 0.04

R18 29.2967 -89.1575 0.11 0.06 0.05 0.09 0.05 0.04 0.13 0.08 0.07 0.12 0.08 0.07 0.1 0.06 0.05

R19 29.3382 -89.1836 0.11 0.06 0.05 0.08 0.05 0.04 0.13 0.08 0.06 0.12 0.08 0.07 0.09 0.05 0.04

R2 28.9636 -89.4025 0.13 0.08 0.07 0.12 0.08 0.07 0.14 0.09 0.08 0.12 0.08 0.08 0.12 0.08 0.07

R20 29.3495 -89.2666 0.11 0.06 0.05 0.08 0.05 0.04 0.12 0.07 0.06 0.11 0.07 0.06 0.1 0.06 0.05

R21 29.3881 -89.3120 0.1 0.06 0.05 0.08 0.05 0.04 0.11 0.06 0.05 0.1 0.06 0.05 0.09 0.05 0.04

R22 29.2529 -89.1174 0.1 0.06 0.05 0.09 0.06 0.05 0.13 0.08 0.07 0.12 0.08 0.07 0.1 0.06 0.05

R23 29.7637 -89.2865 0.08 0.04 0.04 0.06 0.03 0.03 0.09 0.05 0.04 0.08 0.05 0.04 0.07 0.04 0.03

R24 29.0430 -89.3525 0.13 0.08 0.07 0.1 0.06 0.05 0.14 0.09 0.07 0.11 0.07 0.07 0.12 0.07 0.06

R25 30.3367 -89.1708 0.06 0.03 0.02 0.04 0.02 0.02 0.07 0.04 0.03 0.06 0.04 0.03 0.05 0.03 0.02

R26 29.0826 -89.3137 0.13 0.08 0.07 0.11 0.07 0.06 0.14 0.09 0.08 0.12 0.08 0.07 0.12 0.07 0.06

R27 29.1272 -89.3603 0.12 0.07 0.06 0.09 0.05 0.05 0.13 0.08 0.07 0.1 0.07 0.06 0.11 0.07 0.06

R28 29.1564 -89.3973 0.11 0.06 0.06 0.09 0.05 0.05 0.12 0.07 0.06 0.09 0.06 0.05 0.1 0.06 0.05

R29 29.1875 -89.4501 0.05 0.05 0.05 0.04 0.04 0.04 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05

R3 28.9287 -89.4210 0.15 0.09 0.08 0.13 0.08 0.08 0.15 0.1 0.09 0.13 0.09 0.08 0.12 0.08 0.07

R30 30.3560 -89.1167 0.06 0.03 0.02 0.04 0.02 0.02 0.07 0.04 0.03 0.06 0.04 0.03 0.05 0.03 0.02

R31 29.2342 -89.4950 0.05 0.05 0.05 0.04 0.04 0.04 0.05 0.05 0.05 0.05 0.05 0.05 0.04 0.04 0.04

R32 29.2424 -89.5571 0.1 0.06 0.05 0.09 0.06 0.05 0.11 0.06 0.06 0.09 0.06 0.05 0.08 0.05 0.05

R33 29.2544 -89.6062 0.1 0.06 0.05 0.09 0.06 0.05 0.11 0.06 0.06 0.09 0.06 0.05 0.08 0.05 0.04

R34 29.2838 -89.6352 0.1 0.06 0.05 0.09 0.05 0.05 0.1 0.06 0.05 0.09 0.05 0.05 0.08 0.05 0.04

R35 29.2950 -89.6813 0.1 0.06 0.05 0.09 0.05 0.05 0.1 0.06 0.05 0.08 0.05 0.05 0.08 0.05 0.04

R36 29.3057 -89.7325 0.09 0.05 0.05 0.08 0.05 0.04 0.09 0.05 0.05 0.08 0.05 0.05 0.08 0.05 0.04

R37 29.3129 -89.7805 0.09 0.05 0.04 0.08 0.05 0.04 0.09 0.05 0.05 0.08 0.05 0.04 0.08 0.05 0.04

R38 29.3192 -89.8416 0.09 0.05 0.04 0.07 0.04 0.04 0.09 0.06 0.05 0.07 0.05 0.04 0.08 0.05 0.04

R39 29.3063 -89.8803 0.08 0.05 0.04 0.07 0.04 0.04 0.1 0.06 0.05 0.07 0.05 0.04 0.08 0.05 0.04

R4 28.9530 -89.3799 0.13 0.08 0.08 0.12 0.07 0.07 0.15 0.09 0.08 0.12 0.08 0.07 0.12 0.08 0.07

R40 29.2830 -89.9251 0.08 0.05 0.04 0.08 0.05 0.04 0.11 0.07 0.06 0.07 0.05 0.04 0.09 0.05 0.04

R41 30.2407 -88.7347 0.04 0.02 0.02 0.04 0.02 0.02 0.05 0.03 0.02 0.04 0.02 0.02 0.04 0.02 0.02

R42 30.2334 -88.6836 0.04 0.02 0.02 0.04 0.02 0.02 0.05 0.03 0.02 0.04 0.02 0.02 0.04 0.02 0.02

R43 30.2264 -88.6337 0.04 0.02 0.02 0.04 0.02 0.02 0.05 0.03 0.02 0.03 0.02 0.02 0.04 0.02 0.02

R44 30.2123 -88.5057 0.04 0.02 0.02 0.04 0.02 0.02 0.04 0.02 0.02 0.04 0.02 0.02 0.04 0.02 0.02

R45 30.1981 -88.4514 0.04 0.02 0.02 0.04 0.02 0.02 0.04 0.02 0.02 0.04 0.02 0.02 0.03 0.02 0.02

R46 30.2287 -88.3314 0.04 0.02 0.02 0.04 0.02 0.02 0.04 0.02 0.01 0.04 0.02 0.02 0.03 0.02 0.01

R47 30.2334 -88.2799 0.04 0.02 0.01 0.04 0.02 0.02 0.04 0.02 0.01 0.03 0.02 0.02 0.03 0.02 0.01

R48 30.2426 -88.2289 0.03 0.02 0.01 0.04 0.02 0.01 0.03 0.02 0.01 0.03 0.02 0.02 0.03 0.02 0.01

R49 30.2490 -88.1776 0.03 0.02 0.01 0.04 0.02 0.01 0.03 0.02 0.01 0.03 0.02 0.02 0.03 0.02 0.01

R5 28.9880 -89.3502 0.13 0.08 0.07 0.11 0.07 0.06 0.15 0.09 0.08 0.12 0.08 0.07 0.12 0.08 0.07

R50 30.2429 -88.1249 0.03 0.02 0.01 0.03 0.02 0.01 0.03 0.02 0.01 0.03 0.02 0.02 0.03 0.02 0.01

R51 30.2179 -88.0981 0.03 0.02 0.01 0.03 0.02 0.01 0.03 0.02 0.01 0.03 0.02 0.02 0.03 0.02 0.01

R52 30.2254 -88.0262 0.03 0.02 0.01 0.03 0.02 0.01 0.03 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R53 30.2295 -87.9749 0.03 0.02 0.01 0.03 0.02 0.01 0.03 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R54 30.2312 -87.9224 0.03 0.02 0.01 0.03 0.02 0.01 0.03 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R55 30.2293 -87.8697 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R56 30.3789 -89.0398 0.05 0.03 0.02 0.04 0.02 0.02 0.07 0.04 0.03 0.06 0.04 0.03 0.05 0.03 0.02

R57 30.3905 -88.9739 0.05 0.03 0.02 0.05 0.02 0.02 0.06 0.03 0.03 0.06 0.04 0.03 0.05 0.03 0.02

R58 30.0506 -89.1956 0.07 0.04 0.03 0.05 0.03 0.02 0.08 0.04 0.04 0.07 0.04 0.04 0.06 0.03 0.03

R59 30.2497 -87.6604 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R6 29.0187 -89.3147 0.14 0.09 0.08 0.11 0.07 0.06 0.15 0.09 0.08 0.13 0.09 0.08 0.13 0.08 0.07

R60 29.0452 -90.7606 0.06 0.04 0.03 0.05 0.03 0.03 0.08 0.04 0.04 0.06 0.04 0.03 0.07 0.04 0.03

R61 29.0549 -90.7036 0.06 0.04 0.03 0.06 0.03 0.03 0.08 0.05 0.04 0.07 0.04 0.04 0.07 0.04 0.03

R62 29.0891 -90.5456 0.06 0.04 0.03 0.06 0.04 0.03 0.09 0.05 0.05 0.08 0.05 0.04 0.08 0.04 0.04

R63 29.0584 -90.4559 0.06 0.04 0.03 0.06 0.04 0.03 0.1 0.06 0.05 0.08 0.05 0.05 0.08 0.05 0.04

R64 29.0659 -90.3210 0.08 0.05 0.04 0.07 0.04 0.04 0.11 0.06 0.05 0.08 0.05 0.05 0.08 0.05 0.04

R65 29.0860 -90.2228 0.08 0.05 0.04 0.08 0.05 0.04 0.11 0.07 0.06 0.08 0.05 0.05 0.08 0.05 0.04

R66 29.1089 -90.1794 0.08 0.05 0.04 0.08 0.05 0.04 0.11 0.07 0.06 0.08 0.05 0.05 0.08 0.05 0.04

R67 29.1330 -90.1383 0.08 0.05 0.04 0.08 0.05 0.04 0.11 0.07 0.06 0.08 0.05 0.05 0.08 0.05 0.04

R68 29.1598 -90.0977 0.09 0.05 0.05 0.08 0.05 0.04 0.11 0.07 0.06 0.08 0.05 0.05 0.09 0.05 0.04

R69 29.1867 -90.0546 0.09 0.05 0.05 0.09 0.05 0.04 0.11 0.07 0.06 0.08 0.05 0.05 0.09 0.05 0.04

R7 29.0549 -89.2832 0.14 0.09 0.08 0.12 0.07 0.06 0.15 0.09 0.08 0.14 0.09 0.08 0.13 0.08 0.07

R70 29.2253 -90.0056 0.08 0.05 0.04 0.08 0.05 0.04 0.11 0.07 0.06 0.08 0.05 0.04 0.09 0.05 0.04

R71 29.2511 -89.9598 0.08 0.05 0.04 0.08 0.05 0.04 0.12 0.07 0.06 0.08 0.05 0.04 0.09 0.05 0.04

R72 30.3605 -88.8188 0.04 0.02 0.02 0.04 0.02 0.02 0.05 0.03 0.02 0.04 0.03 0.02 0.04 0.02 0.02

R73 30.2628 -87.6065 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.03 0.01 0.01 0.03 0.02 0.01

R74 30.2290 -87.8182 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R75 30.2364 -87.7659 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R76 30.2431 -87.7150 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.03 0.02 0.01 0.03 0.02 0.01

R77 30.3047 -89.2769 0.06 0.03 0.02 0.05 0.02 0.02 0.07 0.04 0.03 0.06 0.04 0.03 0.05 0.03 0.02

R78 30.3218 -89.2231 0.06 0.03 0.02 0.04 0.02 0.02 0.07 0.04 0.03 0.06 0.04 0.03 0.05 0.03 0.02

R8 29.0826 -89.2429 0.14 0.08 0.07 0.11 0.06 0.06 0.16 0.1 0.08 0.14 0.09 0.08 0.12 0.07 0.06

R9 29.0275 -89.2209 0.15 0.09 0.08 0.11 0.07 0.06 0.18 0.11 0.09 0.16 0.1 0.09 * 0.14 0.08 0.07

R79 29.0450 -90.8159 0.06 0.03 0.03 0.05 0.03 0.03 0.07 0.04 0.04 0.06 0.04 0.03 0.07 0.04 0.03

R80 29.0531 -90.8637 0.06 0.03 0.03 0.05 0.03 0.02 0.07 0.04 0.03 0.06 0.04 0.03 0.07 0.04 0.03

R81 29.0481 -90.9178 0.05 0.03 0.03 0.05 0.03 0.02 0.07 0.04 0.03 0.06 0.04 0.03 0.06 0.04 0.03

R82 29.0660 -90.9576 0.05 0.03 0.03 0.05 0.03 0.02 0.07 0.04 0.03 0.06 0.03 0.03 0.06 0.03 0.03

R83 29.1742 -91.0085 0.05 0.03 0.03 0.05 0.03 0.02 0.06 0.04 0.03 0.06 0.03 0.03 0.06 0.03 0.03

R84 29.1836 -91.0620 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.04 0.03 0.05 0.03 0.03 0.06 0.03 0.03

R85 29.2040 -91.1063 0.05 0.03 0.02 0.04 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0.03 0.06 0.03 0.02

R86 29.2220 -91.1515 0.05 0.03 0.02 0.04 0.02 0.02 0.06 0.03 0.03 0.05 0.03 0.03 0.06 0.03 0.02

R87 29.2246 -91.2011 0.05 0.03 0.02 0.04 0.02 0.02 0.06 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

R88 29.2391 -91.2479 0.04 0.03 0.02 0.04 0.02 0.02 0.06 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

R89 29.2589 -91.2920 0.04 0.02 0.02 0.04 0.02 0.02 0.06 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

R90 29.2916 -91.3251 0.04 0.02 0.02 0.04 0.02 0.02 0.05 0.03 0.03 0.05 0.03 0.02 0.05 0.03 0.02

R91 28.8860 -89.4362 * 0.16 * 0.1 * 0.09 * 0.14 * 0.09 * 0.09 0.16 0.11 0.1 0.14 0.1 0.09 0.13 * 0.09 * 0.08

R92 30.2733 -87.5576 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R93 30.2812 -87.5080 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R94 30.2915 -87.4594 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R95 30.2991 -87.4104 0.03 0.02 0.01 0.03 0.02 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R96 30.3101 -87.3627 0.03 0.02 0.01 0.03 0.01 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R97 30.3208 -87.3140 0.03 0.02 0.01 0.03 0.01 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R98 30.3171 -87.2631 0.03 0.02 0.01 0.03 0.01 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R99 30.3216 -87.2131 0.03 0.02 0.01 0.03 0.01 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

R100 30.3276 -87.1632 0.03 0.02 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.02 0.01 0.01 0.03 0.01 0.01

+ Represents Class I Area receptor.

2000, 2001, 2002, 2003 and 2004 Meteorology - 300m, 600m, 900m Mixing Heights

OCD5 Predicted Annual Average NO2 Concentrations - μg/m3

* Represents maximum annual average concentration corresponding to the meteorological year and mixing height represented for each column.

Receptor Lat, dd Lon, dd

2000 2001 2002 2003 2004

September 2011
ATTACHMENT D: MODELING RESULTS FOR BRETON
Table D-1. OCD Modeled Concentrations for Breton Receptors - 1-Hour NO2 Standard

Mars B Host Operations

Receptor Lat, dd Lon, dd 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 90

B1 29.4851 -89.1701 16.3 16.3 16.3 5.96 5.62 5.62 16.3 16.3 16.3 16.3 16.3 1B2 29.4623 -89.2030 *16.74 *16.74 *16.74 6.12 6.11 6.11 *16.74 *16.74 *16.74 *16.74 *16.74 *1

C1 29.9088 -88.8219 4.41 3.96 3.96 *7.02 *7.02 *7.02 11.39 11.39 11.39 8.7 8.7 C2 29.9524 -88.8261 4.36 4.3 4.3 6.63 6.63 6.63 11.4 11.4 11.4 8.45 8.45 8C3 29.8669 -88.8371 4.54 4.23 4.23 7.12 7.12 7.12 11.79 11.79 11.79 8.91 8.91 8C4 29.8345 -88.8373 4.59 4.04 4.04 7.38 7.38 7.38 11.84 11.84 11.84 9.09 9.09 9C5 29.7925 -88.8604 4.77 4.61 4.61 7.35 7.35 7.35 12.46 12.46 12.46 9.3 9.3 

OCD5 Predicted Exploration Plan 1-hr Average NO2 Concentrations 

2000, 2001, 2002, 2003 and 2004 Meteorology - 300m, 600m, 900m Mixing Heights

* Represents maximum 1-hr average concentration corresponding to the meteorological year and mixing height represented for each column.

2000 2001 

NO2 CONCENTRATION (μg/m3)

Year 2002 2003
Table D-2. OCD Modeled Concentrations for Breton Receptors - Annual NO2 Standard

Mars B Host Operations

Receptor Lat, dd Lon, dd 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 900 m 300 m 600 m 90

B1 29.4851 -89.1701 0.1 0.06 0.05 0.07 0.04 0.03 0.12 0.07 0.06 0.1 0.07 0B2 29.4623 -89.2030 *0.1 *0.06 *0.05 *0.07 *0.04 *0.04 *0.12 *0.07 *0.06 *0.1 *0.07 *

C1 29.9088 -88.8219 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0C2 29.9524 -88.8261 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0C3 29.8669 -88.8371 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0C4 29.8345 -88.8373 0.05 0.03 0.02 0.05 0.03 0.02 0.06 0.03 0.03 0.05 0.03 0C5 29.7925 -88.8604 0.06 0.03 0.03 0.05 0.03 0.02 0.06 0.04 0.03 0.05 0.03 0

2003

* Represents maximum annual average concentration corresponding to the meteorological year and mixing height represented for each column.

Year 2000

NO2 CONCENTRATION (μg/m3)

OCD5 Predicted Exploration Plan Annual Average NO2 Concentrations 

2000, 2001, 2002, 2003 and 2004 Meteorology - 300m, 600m, 900m Mixing Heights

2001 2002