### * * * PUBLIC NOTICE * * *

OF A PROPOSED MODIFICA TI ON TO THE

PREVENTION OF SIGNIFICANT DETERIORATION PERMIT

WHICH REGULATES THE EMISSION OF AIR POLLUTANTS FOR

STOCKTON COGEN COMPANY

PERMIT NO. SJ 85

- 04

The Region 9 Office of the United States Environmental Protection Agency (EPA) requests public comment on a Proposed Prevention of Significant Deterioration (PSD) Permit. The proposed permit would grant conditional approval, in accordance with the Prevention of Significant Deterioration (PSD)

re gulations (40 CFR 52.21), to the Stockton CoGen Company (Stockton CoGen), located in Stockton, California. Stockton CoGen operates two boilers at its cogeneration plant. The main boiler is a 730 MMBtu/hour circulating fluidized bed boiler that combusts c oal, and the second is a 178 MMBtu/hour auxiliary boiler that combusts natural gas.

The U.S. Environmental Protection Agency originally issued a Prevention of Significant Deterioration (PSD) permit to Stockton CoGen in 1985 to operate the cogeneration pla nt. Stockton CoGen h as requested revisions to its PSD permit to allow for (1) removal of the annual firing rate limitation for the auxiliary boiler; (2) removal of the 90

- day operating exemption for the auxiliary boiler; (3) elimination of

the simultaneou s operation provision for the circulating fluidized bed boiler and auxiliary boiler (except during startup, shutdown, and emissions testing); (4) elimination of fuel #2 as an optional fuel for the auxiliary boiler; and (5) revision of the auxiliary boiler NOx limit to 7 parts per million parts by volume at 3% oxygen or 0.0085 lb NOx/MMBtu to be consistent with SJVAPCD Rule 4320. Th e existing auxiliary boiler NOx limit is 9 ppm at 3% oxygen or 0.0 11 lb NOx/MMBtu

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The emissions of air pollutants from the project are regulated and limited by the San Joaquin Valley Air Pollution Control District (District). As prop osed to be revised, a ir pollution emissions from Stockton CoGen would not cause or contribute to violations of any of the National Ambient Air Quality Standards (NAAQS).

All comments on the proposed permit must be received by email or postmarked by August 4

, 2011 . An extension of this comment period may be granted if a request for an extension adequately demonstrates that more time is required to give commenters a reasonable opportunity to prepare comments. Comments must be sent or delivered in writing to Manny Aquitania at the postal or email address shown below.

All information submitted by the applicant is available as part of the administrative record. The proposed air permit, statement of basis and ambient air quality impact report, permit applicat ion and other supporting information are available on the EPA Region 9 website at http://www.epa.gov/region9/air/permit/r9

- permits

- issued.html. The administrative record may also be viewed in person, Monday through Friday from 9:00 AM to 4:00 PM, at the EP A Region 9 address below. Due to building security procedures, please call to arrange a visit 24 hours in advance. Hard copies of the administrative record can be mailed to individuals upon request in accordance with Freedom of Information Act requirements

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Any written comments must be received (if sent by e

- mail) or postmarked (if sent by U.S. mail) on or

before August 4 , 2011 at the following addresses:

E

- mail: R9airpermits@epa.govU.S. Mail: Manny Aquitania (AIR

- 3) U.S. EPA Region 9

75 Hawthorne Street San Francisco, CA 94105

- 3901 Phone: (415) 972

- 3977

All comments that are received will be included in the public docket without change and will be available to the public, including any personal information provided, unless the comm ent includes Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Information that you consider CBI or otherwise protected should be clearly identified as such and should not be submitted through e

- mail. If you send e

- mail directly to the EPA, your e

- mail address will be automatically captured and included as part of the public comment. Please note that an e

- mail or postal address must be provided with your comments if you wish to receive direct notificat ion of EPA’s final decision regarding the permit and responses to comments submitted during the public comment period.

EPA will consider all written comments submitted during the public comment period before taking final action on the PSD permit and will send notice of the final decision to each person who submitted comments and contact information during the public comment period or requested notice of the final permit decision. EPA will respond to all substantive comments in a document accompanying the f inal permit.

The final decision will become effective 30 days from the date of issuance unless:

1. A later effective date is specified in the decision; or

2. The decision is appealed to the Environmental Appeals Board pursuant to 40 CFR 124.19 (any

per son who submits written comments on the proposed permit or who participates in the Public Hearing may petition the Environmental Appeals Board to review any part of the permit decision within 30 days after the decision has been issued. Any person who faile d to file comments and failed to participate in the public hearing on the proposed permit may petition for review by the Environmental Appeals Board only those parts of the final permit decision which are different than the proposed permit); or

3. There a re no comments requesting a change to the proposed permit, in which case the final decision shall become effective immediately upon issuance.

If the proposed permit becomes final, and there is no appeal, construction of the project may commence, subject t o the conditions of the permit and other applicable permit and legal requirements.

If you have questions, please contact Manny Aquitania at (415) 972

- 3977 or email at R9airpermits@epa.gov . If you would like to be added to our mailing list to receive future information about this permit or other PSD permits issued by EPA Region 9, please contact Manny Aquitania at (415)

972

- 3977 or email at R9airpermits@epa.gov , or visit EP A Region 9's website at http://www.epa.gov/region09/air/permit/psd

- public

- guidelines.html

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