UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION 8 1595 Wynkoop Street DENVER, CO 80202·1129 Phone 800-227-8917 hllp:flwww.epa.gov/region08 

### NOV 0 5 2010 Ref: 8P-AR CERTIFIED MAIL

- RETURN RECEIPT REQUESTED Tracy Carter Regional Vice President Devon Gas Services. LP 20 North Broadway Oklahoma Cily. Oklahoma 73 I02 RE: Request for Additional Reasonable Progress Infonnation for the Devon Energy Production Company I.P. Blaine County#1 Compressor Station. Pursuantto Section I14(a) ofthe Clean Air Act (42 U.S.C. Scetion 74I4(a» Dear Mr. Carter: As you know. onJuly 19.2006. the Environmental Protection Agency (EPA) received a leller from the Montana DepartmentofEnvironmental Quality (MDEQ) that stated it was withdrawing its efforts to adopta state implementation plan (SIP) for regional haze under EPA's Regional Haze Rule (RHR). found at40 erR 51.308. Due to Montana's announcement that it would not 

### be addressing the requirements under40 CFR 51.308. EPA Region 8 is moving forward with the technical and policy work needed to implementthe requirements ofthe RIIR under a Federal implementation plan (FIP). Sec Section I 10(e)(I) ofthe Clean AirAct (CAA). 42 U.S.C §7410(e)(I). As part ofourelTort to address requirements underthe RHR for reasonable progress (RP) goals and strategies (see 40 CFR 51.308(d)(I) and 5 I.308(d)(3». we previously requested infonnation regarding Devon Energy Production Company LP. Blaine County#1 Compressor Station. We have reviewed the infonnation that you submined dated June 18.2009 in response to ourJanuary 29. 2009 CAft. Section 114 infonnation request on the emission units at your facility. Based on the emissions and currentcontrol technology information you submitted. emission units I and 2 {5500 horse power. Ingersoll-Rand natural gas-tired compressorengines} arc sources that warrant furtheranalysis in considering and developing strategies for achieving the RP goal for Montana.
Please submitan analysis ofcontrol options for these two units postmarked within 60 days ofthe date

# orthis kuer. The analysis must address the four factors included in40 eFR 

### § 51.308(dXI)(i)(J\). the costs ofcompliance. the time necessary for compliance. the energyand non-air qualityenvironmental impacts ofcompliance. and the remaining useful life of the potentially affected sources. We suggest that the Best Available Retrofit Technology (BART) Guidelines (see 40 erR 

### Pan 51 Appendix Y) provide additional guidance on how to pcrfonn the cost ofcompliance ponion ofthis analysis. Youranalysis must considerthe full range ofavailable conlroltcchnologics and for each technology. you must considerthe full range ofemission standards including the mOSl stringent.

We understand this is a complicated endeavor. and we are available to answer any questions thal you may have on the RllR or the RP analysis. We will assist you in any way we r.:an and look forward to working with you. Pursuant lO Section 114 ofthe Clean Air Act. 42 U.S.c. *7414. and under authority duly delegated to the undersigned. you are required to provide us with the infonnation speciJicd in this letter. This infonnation will 

### be used by EPA in developing a regional haze FIP, orin the event 

### MDEQ resumes development ofa regional haze SIP. in assisting 

### MDEQ in that effort and/or reviewing a regional haze SIP for Monlana. Furthennorc. information requests pursuant to Section 114 ofthe CAA are not limited to sources that arc regulated by the particular rule EPA is implementing. Forexample. Section 114(a){ I) says that EPA may gatherinformation from ··any person who owns oroperates any emission source·· or ··who the Administratorbelieves may have infonnation necessary for the purposes set forth in this subsection:· A duly authorized officer oragent ofthe facility must certify as true. accurate. and complete the response to this infonnation by signing the enclosed StatementofCertification and returning it with the response. Suchofficeroragent must have sufficient knowledge and authority to make such representations on behalfofDevon Energy Production Company LP. Please submit your response to: u.S. Environmental Protection Agency Region VlIl 1595 Wynkoop Street Denver. CO 80202-1129 Attention: Vanessa Hinkle. 8P-AR
Pursuant to Section 114(e) ofthe CAA. 42 U.S.C. §7414(c). and 40 C.F.R. Part 2. Subpart B. Devon Energy Production Company LP is entitled to assert a businessconfidentiality claim covering any part ofthe submined infonnation. Attachment B specified the assertion and substantiation requirements for business conlidentiality claims. Failure to assert such a claim makes the submitted infonnation subjectto public disclosure upon request and without further notice to you. pursuant to the Freedom oflnfonnation Act. 5 U.S.c. Section 552. Infonnation subjectto a business cQnfidcntiality claim may only be made available to the public in accordance with 40 C.F.R. Part 2. Subpart B.

. A knowing submittal oflalse information in response to this request may be actionable lInder Section 113(e)(2) ufthe 

### Ci\i\. as well as 18 U.S.c. 

### §§ 1001 and 1341. Failure to comply 

### -2-

### with thl.: terms ofthis request may subject Devon Energy Production Company LP to enforcement action under Section 113 

### ofthe CAA. 42 U.S.C. 

### §7413. Also enclosed with this Request for Inlomlution is 

### aSmall Business Regulatory Enforcement and Fairness Act (SBREFA) information sheet. The requirements ofthis letter arc not subject to the Paperwork Reduction Act of 

### 1980_ 44 U.S.C.**~3501** efself. 

### We appreciate your cooperation in this matter. Ifyou have any questions pkasc 

### call Vanessa 

### JIinkle of

### my staffat 

### 303-312-6561.Sincerely.

{- Stephen S. Tuber Assistant Regional Administrator Office ofPartnerships and Regulatory Assistance Enclosures

cc; John Bunyak, NPS Sandra Silva. USFWS 'I'homas Dzomba. USFS



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