UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IX

Brad Westwood, SHPO State ofUtah Historic Preservation Office 300 S. Rio Grande Street (450 West) Salt Lake City, UT 84101 75 Hawthorne Street San Francisco, CA 94105

September 30, 2015

Subject: National Historic Preservation Act Section 106 Consultation - McElmo Creek Unit Oil Production Facility, San Juan County, Utah Dear Mr. Westwood: In accordance with Section 106 ofthe National Historic Preservation Act (NHPA) and its implementing regulations, 36 CFR Part 800, we are providing information for your review and concurrence regarding the projectreferred to in the paragraph below. EPA is the lead federal agency for the issuance ofan amended Prevention ofSignificantDeterioration (PSD) air quality permit in the Navajo Nation Reservation. Wehave made a finding of "No Historic Properties Affected" for this undertaking pursuant to 36 CPR 800.4(d)(l). The United States Environmental Protection Agency, Region 9 (EPA) is reviewing an application for the issuance ofan amended PSD air quality permit, in accordance with the Clean Air Act and the PSD air quality regulations (40 CFR 52.21), for the gas flare (called the "Main Flare") at the McElmo CreekUnit Oil Production Facility (MCU Facility), an existing oil and gas production operation. Other than the potential replacement ofan existing fan to provide better pollution control at the Main Flare, EPA's issuance ofthe amended PSD permit does not authorize any new construction ormodification ofexisting equipment at the MCU Facility. Additionally, EPA is amending the permit to remove certain equipment, and the applicable permitrequirements that apply because this equipmenthas been shut down and removed from the site. In consultation with the Navajo Nation Historic Preservation Department, the area ofpotential effects (APE) for this project consists ofan area within a 2 km (1.2 miles) radius around the Main Flare. Resolute Natural Resources, LLC, contracted with Dinetahd66 Cultural Resources Management (DCRM) to conduct an assessment to**id~ntify** historic properties within the APE (2 km around the Main Flare). Resolute provided DCRM's final assessment ofhistoric properties to EPA on September 2, 2015 (September 2015 DCRMReport enclosed).Based on all ofthe information provided and after careful review and analysis, EPAhas determined that issuance ofthe amended PSD Permitfor the Main Flare will have no effect upon historic properties within the APE. EPArequests that you review the enclosed Project Description Summary and concur on our determination that no historic properties will be affected byEPA's undertaking. Please inform us within 30 days ifyou concur with ourproposed determination. Ifyou do not reply within this 30 day review period, EPA will consider the lack ofreply to be Utah State Historic Preservation Office agreement with the determination. Ifyou have any questions orneed further information, please contact Shaheerah Kelly at (415) 947-4156. Thank you for your assistance and consideration in this matter.

Enclosures: Sincerely,

erardo C. Rios Chief, AirPermits Office Air Division
1. National Historic PreservationActSection 106 Consultation, Project Description Summary, McElmo Creek Unit Oil Production Facility, ProposedAmended CleanAir ActPrevention of SignificantDeterioration Permit, PSD PermitNo. NU05-01; United States Environmental ProtectionAgency, Region 9; September 30, 2015 2. AnNHPAAssessmen

_ t of Historic Properties within a 2-KilometerAPEof the McElmo (reek Unit Main Flare in San Juan County, Utah,forResoluteNatural Resources Company, LLC; Dinetahd66 Cultural Resources Management; September 2, 2015

cc: Patrick Flynn, Resolute Natural Resources Dwight Mallory, Resolute Natural Resources Rena Martin, Dinetahd66 Cultural Resources Management



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