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 UNITED STATES ENVIRONMENTAL PROTECTION AGENCY
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REGION 8
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1595 Wynkoop Street
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Denver, CO  80202-1129
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Phone (800) 227-8917
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www.epa.gov/region8
Ref: 8ARD-PM

Mr. Danny Powers
Air Quality Program Manager
Southern Ute Indian Tribe Environmental Programs 
P.O. Box 737, Mail Slot #84
Ignacio, Colorado  81137-0737
Via email: dpowers@southernute-nsn.gov

Re:	Red Cedar Gathering Company, Antler Power Station, Permit # SMNSR-SU-000476-2021.001, Proposed Synthetic Minor New Source Review Permit

Dear Mr. Powers:

The U.S. Environmental Protection Agency Region 8 is proposing to issue a synthetic minor source permit pursuant to the Tribal Minor New Source Review (MNSR) Permit Program at 40 CFR part 49 for the Antler Power Station located on Indian country lands within the Southern Ute Indian Reservation, in La Plata County, Colorado. As requested by Red Cedar, this permit would incorporate requested limits on NOX emissions and operating hours for the four natural gas fired turbine units used for electric power generation. The hours of operation would be reduced by 50% of full-time operation, but the reduced hours may not be evenly distributed between each of the four units. As such, to allow operational flexibility, the proposed permit, at Red Cedar's request, limits the combined run hours of all four natural gas-fired turbines to 17,520 hours, a facility-wide NOX emissions limit of 230 tons per year (tpy) and a 25.4 lb/hr NOX emissions limit for each turbine to establish the source as a synthetic minor source for the purpose of the Prevention of Significant Deterioration (PSD) Permit Program at 40 CFR part 52. Proposed limitations do not include any add-on emission controls to meet the emission limits described above.

A public comment period for the proposed permit will begin on August 10, 2022 and end on September 8, 2022.

The proposed permit and supporting documentation are available in the electronic docket at Regulations.gov (Docket ID #EPA-R08-OAR-2021-0041), and we ask that you please assist members of the public who contact you with instructions on how to access the material available for public review until the end of the public comment period. Comments may be submitted via email to R8AirPermitting@epa.gov, or through https://www.regulations.gov (Docket ID #EPA-R08-OAR-2021-0041). In addition, we have enclosed a copy of the bulletin board public notice announcement and would appreciate it if you could post this announcement in prominent locations in your area. All of these documents will also be available for review in electronic format on our website at: https://www.epa.gov/caa-permitting/caa-permit-public-comment-opportunities-region-8. 



If you have any questions concerning the proposed permit or technical support documents, please contact Lohitaksha (Lo.) Rao, of my staff, at (303) 312-6241 or at rao.lohitaksha@epa.gov.   
                                          
                                       Sincerely,
                                                
                                    Monica Morales
                                    Acting Director
                                    Air and Radiation Division
                                    
Enclosure
