UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IX 75 Hawthorne Street San Francisco, CA 94105·3901 March 14, 2007 Mr. Andrew Welch, P.E
. Project Manager E&L Westcoast, LLC 8403 Colesville, Suite 915 Silver Spring, Maryland 20910 Subject: Application for a Prevention of Significant Deterioration (PSD) Permit for the Colusa Generating Station in Colusa County Dear Mr. Welch : This letter is in response to your PSD application which was received by the Region 9 office ofthe Environmental Protection Agency (EPA) on December 22 ,2006 and the supplemental information on modeling for near-field visibility, Class I visibility, and Class I increment which was received by our office by electronic mail in February 2007. The PSD application is for the construction and operation of a nominal 660 megawatt combined cycle power plant in Colusa County. Based on our review ofthe application, we have determined that the application is administratively complete. A preliminary determination, which will include an Ambient Air Quality Impact Report (AAQIR) and draft permit, is being developed. This notification ofcompleteness does not imply that the EPA agrees with any analyses , conclusions or positions contained in the application
. We may request additional information to clarify, modify, or supplement previously submitted material. Also , ifyou should request a suspension in the processing ofthe application, or submit new information indicating a significant change in the project design, ambient impact or emissions, this determination of completeness may be revised. Upon issuance ofthe preliminary determination, we will publish a public notice ofour intent to issue the permit. The comment period specified in the notice shall be at least 30 days. Please be advised that at anytime anyone may have full access to the application materials and other information you provide to us in connection with this permit action. This letter also informs you ofyour rights to claim business confidentiality under 40 CFR 2 , Subpart B for any part ofor all ofthe information you provide us , and to document for our files that we have done so
. Ifyou do not make a claim ofconfidentiality for any ofthis material with in 15 days ofthe date you receive this letter you will have waived your right to do so
. The facility name and address may not be claimed as confidential.

Printed on Recycled PaperIf you wish to claim confidentiality, you must substantiate your claim. Your substantiation must address the points enumerated in the enclosed instructions, in accordance with 40 CFR 2.204(e)
. Ifyou have any questions concerning the review ofyour application, please contact Shaheerah Kelly, Environmental Engineer, ofmy staff at (415) 947-4156. For questions regarding confidentiality claims, please contact Ann Lyons at (415) 972-3883, and for air quality modeling questions , please contact Scott Bohning at (415) 947-4127. Sincerely, 

# 94/dL
Gerardo C. Rios Chief, Permits Office Attachment
cc: Harry Krug, Colusa County Air Pollution Control District Robert Fletcher, California Air Resources Board Jack Caswell, California Energy Commission Mark Strehlow, URS Corporation

2ATTACHMENT INSTRUCTIONS FOR CLAIMING CONFIDENTIALITY A. Pursuant to 40 CFR 2.204(e), your claim must address these points:
1. The portions ofthe information alleged to be entitled to confidential treatment;
ll. The period oftime for which confidential treatment is desired by the business (e.g., until the occurrence of a specific event, or permanently); m. The purpose for which the information was furnished to EPA and the appropriate date of submission, ifknown;
IV. Whether a business confidentiality claim accompanied the information when it was received by EPA;
v. Measures taken by you to guard against the undesired disclosure ofthe information to others;
VI. The extent to which the information has been disclosed to others and the precautions taken in connection therewith;
Vll. Pertinent confidentiality determinations, if any, by EPA or other Federal agencies, and a copy of any such determination or reference to it, if available;
Vlll. Whether you assert that disclosure ofthis information would be likely to result in substantial harmful effects on your business's competitive position, and if so, what those harmful effects would be, why they should be viewed as substantial; and an explanation ofthe casual relationship between disclosure and such harmful effect, and
IX. Whether you assert that the information is voluntarily submitted information and if so, whether any disclosure ofthe information would tend to lessen the availability to EPA of similar information in the future. "Voluntarily submitted information" is defined in 40 CFR Section 2.201(i) as business information in EPA's possession

- - a. The submission ofwhich EPA has no statutory or contractual authority to require; and b. The submission ofwhich was not prescribed by statute or regulation as a condition ofobtaining some benefit (or avoiding some disadvantage) under a regulatory program ofgeneral applicability, including such regulatory programs as permit, licensing, registration, or certification 1programs, but excluding programs concerned solely or primarily with the award or administration by EPA ofcontracts or grants. B. We will disclose information covered by your claim only to the extent provided for in 40 CFR Part 2, Subpart B Confidentiality ofBusiness Information. Please address your claim and substantiation ofconfidentiality to the staffperson mentioned in the letter at EPA Region 9 (AIR-3), 75 Hawthorne Street, San Francisco, CA 94105.

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