UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

AIR, PESTICIDES & TOXICS MANAGEMENT DIVISION

61 Forsyth St., S. W.

Atlanta, Georgia 30303

ACTION: Preliminary Determination s and Draft Outer Continental Shelf (OCS) Air

Permit s , OCS

- EPA

- R40 19 and OCS

- EPA

- R40 20 , for Anadarko

Petroleum Corporation (Anadarko)

, Eastern Gulf of Mexico Exploratory

Drilling Operations

Public Notice & November 14 , 201 4 : Publication in the Florida Administrative

Comment Period: Register , emails to the OCS public notice list, www.regulations.gov , and the

EPA Region 4’s website at:

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

December 15 , 201 4 : Close of Public Comment Period

. If a public hearing is

held, the public comment period will automatically be extended to the close of

the public hearing.

Public H earing : If there is a significant degree of public interest, a hearing will be held

December 18 , 2014, from 5:30 pm

– 7:00 pm at:

West Florida Public Library

239 North Spring Street

Pensacola, Florida 32502

(850) 436

- 5043.

If a public hearing is held, EPA staff will be available prior to the hearing,

from 4:00

– 5 :30 pm to answer questions and provide additional information on

this proposed action s during an informal public information session.

Project: Anadarko has applied for two OCS air permit s pursuant to section 328 of the

Clean Air Act (CAA) from EPA Region 4

. The proposed air permit s will

regulate emissions from exploratory drilling operation s within the Eastern Gulf

of Mex ico of the OCS. The proposed project associated with draft permit

OCS

- EPA

- R4019 will mobilize the exploratory drillship Diamond BlackHawk

and the proposed project associated with draft permit OCS

- EPA

- R 4020 will

mobilize the Diamond BlackHornet

. Each project will use up to two support

vessels to transport personn el and supplies and up to four support vessels for

well completion . The proposed project s will consist of three phases: the

drilling phase, the well completion phase, and the production well maintenance

phase. The proposed projects are for ex ploratory drilling only and do not

include the establishment of any permanent production platforms

.

The EPA has completed a review of Anadarko ’s application s in addition to all

supplemental materials provided and is proposing to issue Permit Number

OCS

- EPA

- R40 19 and Permit Number OCS

- EPA

- R40 20 to Anadarko for two

exploratory drilling program s subject to the terms and conditions described in

the draft permit s. These project s are considered major source s under the

applicable Prevention of Significant Deterioration (PSD) regulations 40 CFRpart 52.21 and are subject to the title V program at 40 CFR part 71. The draft

permit s incorporate applicable requirements from the federal PSD and title V

operating permit programs, New Source Performance Standards (NSPS), and

National Emission Standards for Hazardous Air Pollutants (NESHAP) as

required by the OCS air quality regulations in 40 CFR part 55

.

Project Location: Anadarko’s project s are located on the OCS in the Eastern Gulf of Mexico.

The drilling sites are located east of longitude 87.5, west of the Military

Mi ssion Line (86°41’ west longitude), at least 100 miles from the Louisiana

shoreline, and at least 125 miles from the Florida shoreline

.

Authority: EPA Region 4 is the agency responsible for implementing and enforcing CAA

requirements for OCS sou rces in the Gulf of Mexico east of longitude 87.5° W.

The Department of Interior , Bureau of Ocean Energy Management, is the lead

a gency for leasing and drilling approvals and for implementation of the Clean

Air Act west of 87.5° longitude

.

Emissions: The maximum pot ential ann ual em issions in tons per year for each drilling

vessel and their associated support vessel s are summarized in the fo llowing

table:

Potential to Emit for Regulated NSR Pollutants

Pollutant PTE (tpy) Significant Emission Rate (tpy) PSD Review Required

CO 5 40 100 Yes

NO

x 1 1, 447 40 Yes

VOC 2 171 40 Yes

PM 58 25 Yes

PM 10 56 15 Yes

PM 2.5 56 10 Yes

SO 2 3 1 40 No

H 2 SO 4 0.03 7 No

Pb 0.02 0.6 No

CO 2 e 125,000 75,000 (subject to regulation threshold) Yes

1 NO

x is a measured pollutant for the criteria pollutants ozone and NO 2 and a precursor for ozone and PM 2.5

.

2 VOC is a measured pollutant and precursor for the criteria pollutant ozone.

3 SO 2 is a precursor for the criteria pollutant PM 2.5

.

A full air quality impact analysis was performed for these project s . A

summary of the results of th e air quality impact analysis are available in the

preliminary determination s (see additional information below).

Control Technology: Anadarko is required to apply Best Available Control Technology (BACT)

for emissions of NO X

, CO, VOC, PM/PM 10 /PM 2.5 , and GHGs.

BACT requirements for the engines depend on engine characteristics and will

include diesel engines equipped with turbocharger, aftercooler, and high

injection pressure

, tier

- certified engines (where applicable), and /or good

combustion practices. The se project s will also use ultra

- low sulfur diesel fuel

to limit sulfur di oxide and particulate emissions. The main propulsion

generator engines will be equippe d with a parametric emissions monitoring

system (PEMS) to be used in conjunction with an enhanced monitoring,

maintenance

, and load management system

.Additional Information: The draft permit s and preliminary determination s /statement s of basis that

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

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

EPA Contact: For questions rega rding the draft permit s and public hearing, contact:

Eva Land

Air Permits Section

Air, Pesticides and Toxics Management Division

U.S. EPA Region 4

61 Forsyth Street, SW

Atlanta, GA 30303

(404) 562

- 8435

Email: land.eva@epa.gov

C omments on the draft permit s an d requests for a public hearing should be addressed to :

U.S. EPA Region 4

Air Permits Section, APTMD

61 Forsyth Street, SW

Atlanta, GA 30303

Attn: Ros a Yarbrough

Email: R4OCSpermits@epa.gov