

--------------------------------------------------------------------------------
 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. Edmund Baker 							
Environmental Director
Three Affiliated Tribes
404 Frontage Road
New Town, North Dakota  58763

Re:	Crusoe Energy Systems Inc., Charging Eagle 21-25 Pad, 
	Permit # TMNSR-TAT-008173-2022.001, Proposed True Minor New Source Review Permit

Dear Mr. Baker:

The U.S. Environmental Protection Agency Region 8 is proposing to issue a permit in accordance with the Tribal Minor New Source Review (MNSR) Permit Program at 40 CFR part 49, for Crusoe Energy Systems Inc.'s proposed construction and operation of a maximum of three 2,500 horsepower generator engines at the RimRock Oil and Gas Williston, LLC (RimRock), Charging Eagle 21-25 Pad. The purpose of the generator engines is to take gas from the wells that would otherwise be flared to use as fuel in order to power small data centers. The proposed project is estimated to be a true minor source of criteria pollutants with respect to the MNSR Permit Program at 40 CFR part 49.

The proposed permit contains emissions limitations, associated monitoring, recordkeeping and reporting requirements for the certain pollutant emission-generating units or activities approved for construction and installation, as well as our review of existing relevant regulations and existing federal and state permits for similar types of operations. 

A public comment period for the proposed permit will begin on July 22, 2022, and end on August 22, 2022. 

The proposed permit and supporting documents are available in the electronic docket at regulations.gov (Docket ID # EPA-R08-OAR-2022-0425), and we ask you 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 public comment period. Comments may be submitted via mail, via email to R8AirPermitting@epa.gov, or through https://www.regulations.gov (Docket ID #EPA-R08-OAR-2022-0425). In addition, we have provided copies 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 document, please contact Suman Kunwar, of my staff, at (303) 312-6095 or at kunwar.suman@epa.gov.   

						Sincerely,
                                    
						Gail Fallon
                              Air Permitting and Monitoring Branch Manager
                                    Air and Radiation Division



