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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. Mike Natchees
Director, Air Quality Program
Energy & Minerals Division 
Ute Indian Tribe
P.O. Box 70
Fort Duchesne, Utah  84026

Re:	Monarch Natural Gas, LLC, Riverbend Compressor Station
            Permit # SMNSR-UO-000021-2020.001, Proposed Synthetic Minor New Source Review Permit

Dear Mr. Natchees:

The U.S. Environmental Protection Agency Region 8 is proposing to issue a synthetic minor New Source Review (synthetic MNSR) permit for the existing Monarch Natural Gas, LLC. (Monarch), Riverbend Compressor Station on the Uintah and Ouray Indian Reservation. As requested by Monarch, this synthetic MNSR permit would authorize the construction, installation and operation of new emissions sources, specifically two Joule Thompson (JT) Skids, three 500 barrel methanol storage tanks, two 18,000 gallon bullet tanks, four natural gas driven piston methanol pneumatic pumps and eight natural gas driven pneumatic controllers associated with the JT skids. This synthetic MNSR permit proposes to establish enforceable restrictions for fugitive emissions from each of the two JT Skids and associated storage tanks and equipment, as well as associated operational, monitoring, recordkeeping and reporting requirements. Monarch is also requesting to incorporate enforceable requirements to control nitrogen oxides, carbon monoxide, volatile organic compounds and benzene emissions existing equipment, including four field gas fired, 4-stroke, lean-burn compressor engines using catalytic emissions control systems and two existing glycol dehydration units using a thermal oxidizer.

A public comment period for the proposed permit will begin on June 12, 2020, and end on 
July 13, 2020.

We have enclosed a CD and paper copy containing the proposed permit and supporting documentation, and we ask that you please make this material available for public review until the end of the 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-2020-0089). 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 enclosed proposed permit or technical support documents, please contact Colin Schwartz, of my staff, at (303) 312-6043.   
                                          
                                       Sincerely,
                                             
                                      Carl Daly
                                    Acting Director
                                      Air and Radiation Division
                                      
                                      
Enclosures

