UNITED STATES ENVIRONMENTAL PROTECTION AGENCY REGION IX 75 Hawthorne Street San Francisco, CA 94105

September 30, 2015

Stefanie Baltzell, Archaeology & Historic Preservation State ofColorado Historic Preservation Office 1200 Broadway Denver, CO 80203 Subject: National Historic Preservation Act Section 106 Consultation -McElmo Creek Unit Oil Production Facility, San Juan County, Utah
Dear Ms. Baltzell:
In accordance with Section 106 ofthe National Historic Preservation Act (NHP A) and its implementing regulations, 36 CFR Part 800, we are providing information for your review and concurrence regarding the project referred to in the paragraphbelow. 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 CFR 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. Otherthan the potential replacement ofan existing fan to provide betterpollution 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**equip~ent,** and the applicable permitrequirements that apply because this equipment has been shut down and removed from the site.
In consultation with the Navajo Nation Historic PreservationDepartment, 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 identify 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 Permit for 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 our proposed determination. Ifyou do not reply within this 30 day review period, EPA will considerthe lack ofreply to be Colorado 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: erar o C. Rios Chief, Air Permits Office Air Division

1. National Historic PreservationActSection 106 Consultation, ProjectDescription Summary, McElmo Creek Unit Oil Production Facility, ProposedAmended CleanAir ActPrevention of Significant Deterioration Permit, PSD PermitNo. NU05-01; United States Environmental Protection Agency, Region 9; September 30, 2015 2. AnNHPAAssessmentof Historic Properties within a 2-KilometerAPEof the McElmo Creek UnitMain 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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