UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

AIR, PESTICIDES & TOXICS MANAGEMENT DIVISION

61 Forsyth St., S. W.

Atlanta, Georgia 30303

FACT SHEET

ACTION: Preliminary Determination and Draft Revised Outer Continental Shelf

(OCS) Air Permit

, OCS

- EPA

- R400 8

- M2 , for

BHP Billiton Petroleum, Inc. (BHPB) , Sake Prospect Project

Public Notice & May 24 , 201 3 : Publication in the Panama City News Herald, Mobile Press

Comment Period: Register, Pensacola News Journal , and Florida Register

June 24 , 201 3 : Close of Public Comment Period

Public H earing : Requests for a hearing must be received by June 10, 2013

. If deemed

necessary, a public hearing will be held the week of June 24 th , 2013. Details of

scheduled hearing will be posted by June 12, 2013, on EPA’s web site at :

http://www.epa.gov/region4/air/permits/ocspermits/ocspermits.html

Project: The permitted project, which has not yet begun drilling, will use one of two

deepwater exploratory dr illing vessels and associated support fleet that BHPB

proposes to operate within contiguous DeSoto Canyon OCS lease blocks in the

Gulf of Mexico. BHPB has requested the permit be amended to include

revised best available control technology (BACT) limits fo r eight (8) engines

on the Development Driller 1 ( DD1 ) exploratory drilling vessel based on

recent source test data that was not available at the time of permitting. The

permit revision does not constitute a modification to the emission units or

operation of the facility.

This project is considered a temporary major source under the applicable

Prevention of Significant Deterioration regulations 40 CFR part 52.21 and is

subject to the title V program at 40 CFR part 71.

Project Location: The project is located on the OCS in the Gulf of Mexico within lease blocks

499, 543

- 545, 586

- 592, 631

- 640, 676

- 685, 721

- 729, 768

- 773, and 815

- 817

. The se contiguous lease blocks are located approximately within latitude 28.15°

to 28.50° N and longitude 86. 68° to 87.27° W

. The center of the contiguous

lease block area is located at 28.31° N and longitude 86.96° W, approximately

120 miles southeast of the nearest Louisiana shoreline, 139 miles south

southeast of the nearest Mississippi shoreline, and 125 mile s south of the

nearest Alabama and Florida shorelines

.

Authority: EPA is the agency responsible for implementing and enforcing Clean Air Act

(CAA) requirements for OCS sou rces in the Gulf of Mexico east of longitude

87.5° W.Emissions: The maximum potential ann ual emissions in tons per year for each operating

scenario drillship and support vessel s are summarized in the fo llowing table:

Potential to Emit for Regulated NSR Pollutants

Pollutant C.R. Luigs

Potential to Emit,

Tons per Year DD1

Potential to Emit,

Tons per Year Significant

Emission Rate,

Tons per year PSD Review

Required?

PM 66.02 77.28 25 Yes

PM 10 41.15 72.44 15 Yes

PM 2.5 40.16 72.26 10 Yes

NO X 1 1

, 699.60 1

, 30 9

. 61 40 Yes

SO 2 1 0.91 0.88 40 No

H 2 SO 4 0.03 0.03 7 No

CO 373.69 3 10

. 64 100 Yes

VOC 1 81.61 110.48 40 Yes

GHGs

(CO 2 e) 101,574.72 111,088.86 75,000 (subject to

regulation threshold) Yes

Lead 0.02 0.02 0.60 No

1 NO X and VOC are the measured precurs ors for the criteria pollutant o zone. NO X & SO 2 are precursors for PM 2.5

.

Proposed Changes : The BACT emission limits for PM/PM 10 /PM 2.5 , VOC, and GHGs for the

main engines of the DD1 are being revised. The respective control technology

determinations for these engines are not being revised; however, high

pressure fuel inje ction/high

- efficiency fuel injection, which has already been

deemed to be BACT for other pollutants, is now being included as BACT for

CO 2 e emissions. Public comments are being accepted for these proposed

changes only.

Additional Information: The draft permit and preliminary determination document that explains the

changes to the permit conditions are available on EPA Region 4’s website at :

http://www.epa.gov/region 4/air/permits/ocspermits/ocspermits.html

EPA Contact: For quest ions or comments on the draft permit and public hearing contact:

Art Hofmeister

EPA Region 4, APTMD

61 Forsyth Street, SW

Atlanta, GA 30303

( 404 ) 562

- 91 15

Fax: (404) 562

- 9066

Email: hofmeister.art@epa.gov