### Page 1 of 2 * * * Public Notice * * *

Navajo Generating Station

Announcement of Proposed Permit and Request for Public Comment on the Proposed Clean Air Act Minor NSR Permit in Indian Country

Tribal Minor NSR Permit: T

- 0 004

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The United States Environmental Protection Agency , Region 9 (EPA) provides notice of, and requests public comment
on, EPA’s proposed action relating to the Minor New Source Review (NSR) permit application (Application) for the addition of a refined coal treatment system ( R CTS) at Navajo Generating Station (NGS)

. EPA is issuing a Minor New Source Review (NSR) Permit in Indian Country that would grant conditional approval, in accordance with the Minor NSR regulations for Indian Country (40 CFR 49.151

- 161) , to Salt River Project Agricultural Improvement and Power District (SRP). The permit would authorize SRP to construct and operate the RCTS , including ancillary equipment, in order to treat coal with cement kiln dust and calcium bromide for the further reduction of oxides of nitrogen (NO x ) and mercury emissions, respectively

. If finalized, this m inor NSR p ermit will be incorporated by Navajo Nation EPA into Navajo Generatin g Station’s title V/Federal Operating Permit as an administrative amendment pursuant to 40 CFR 71.7(d)(i)(v). The address for SRP is 1521 North Project Drive, Tempe, Arizona, 85281

. The proposed location for the NGS R CTS Project is at the existing NGS located approximately 5 miles east of Page, Arizona on Arizona State Route 98.

NGS currently has a combined power generating capacity of 2,250 net megawatts and consists of three existing coal

fired steam generating units (Boiler Units 1, 2, and 3), asso ciated air pollution control devices, and auxiliary equipment. The proposed permit for the R CTS Project would result in increases in emissions of particulate matter

. Air pollution emissions from the RCTS Project would not cause or contribute to violations of any National Ambient Air Quality Standards (NAAQS).

All written comments must be received or postmarked by March 7 , 2016

. Any person may submit written comments on the proposed permit during the public comment period (i.e. on or before March 7 , 2016)

. These comments must raise any reasonably ascertainable issue with supporting arguments by the close of the public comment period

. In your written comments, please include the subject line: “Comments on Proposed Minor NSR Permit for SRP Navajo Generating Station”. Comments or requests for a public hearing must be received or postmarked in writing to Larry Maurin at one of the following addresses:

E

- mail: R9airpermits@epa.gov

U.S. Mail: Larry Maurin (AIR

- 3)

U.S. EPA Region 9 75 Hawthorne Street San Francisco, CA 94105

- 3901

Comments should address the NGS R CTS Project and the proposed minor NSR permit , including such matters as:

1. The applicability of Tribal NSR regulations for the proposed permit ; 2. The effects, if any, on Class I areas; and 3. The effect of the proposed permit , if any, on ambient air quality.

### Page 2 of 2 A nyone may request a public hearing pursuant to 40 CFR 49.157(c) prior to the end of the public comment period. Request s must be submitted to the contact identified above.

Information submitted by the A pplicant as part of the A pplication is available as part of the administrative record for this proposed permit

. The administrative record is available at http://www.regulations.gov / u nder docket ID number EPA

R09

- OAR

- 2016

- 0026. The proposed permit, Technical Support Document
, a pplication and other supporting information are available through the EPA Region 9 website at http://www2.epa.gov/caa

- permitting/tribal

- nsr

- permits

- region

- 9



### . The administrative record may also be viewed in person, Monday through Friday (excluding Federal holidays) from 9:00 AM to 4:00 PM, at the EPA Region 9 address above. Due to building security procedures, please call Larry Maurin at (415) 972

- 3943 at least 48 hours in advance to arrange a visit. Larry Maurin can also be reached through EPA Region 9’s toll

free general information line at (866) 372

- 9378.

EPA’s proposed permit for the NGS R CTS Project and the accompanying Technical Support Document are also a vailable for review in hardcopy at the following locations: Page Public Library, 479 South Lake Powell Blvd ., Page, Arizona 86040, (928) 64 5

- 4270; LeChee Chapter House, located 5 miles south on Coppermine Rd., LeChee, Arizona, 86040 , (928) 698

- 2800 ; and Navajo Nation Environmental Protection Agency , Air Quality Control Program , Route 112, North Bldg. #2837 , Fort Defiance, Arizona 86504 , (928) 871‐ 6790

.
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 comment includes Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Information that is considered to be CBI or otherwise protected should be clearly identified as such and should not be submitted through e

- mail. If a commenter sends e

- mail directly to the EPA, the 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 comments if the commenter wishes to receive direct notification of EPA’s final decision regarding the Application and proposed p ermit.

Before taking final action on the proposed minor NSR permit, EPA will consi der all written comments submitted during the public comment period

.
EPA will send notice of our final permit decision to each person who submitted comments and contact information during the public comment period or requested notice of the final permit d ecision. EPA will summarize the contents of all substantive comments and provide written responses in a document accompanying EPA’s final permit decision.

EPA’s final permit decision will become effective 30 days after the service of notice of the decision unless:

1. A later effective date is specified in the decision; or 2. The decision is appealed to EPA’s Environmental Appeals Board pursuant to 40 CFR 49.159(d) or 3. There are no comments requesting a change to the proposed permit decision, in which case the final decision shall become effective immediately upon issuance.

If you have questions, or if you wish to obtain further information, please contact Larry Maurin at (415) 972

- 3943 , via email at R9 airpermits@epa.gov , or at the mailing address above

. If you would like to be added to our mailing list to receive future information about this proposed permit decision or other permit decisions issued by EPA Region 9, please
contact Larry Maurin at (415) 972

- 3943 or send an email to R9airpermits@epa.gov , or visit EPA Region 9's website at http://www2.epa.gov/caa

- permitting/tribal

- nsr

- p ermits

- region

- 9

. Larry Maurin can also be reached through EPA Region 9’s toll

- free general information line at (866) 372

- 9378.

*** Please bring the foregoing notice to the attention of all persons who would be interested in this matter. ***