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�= Mountain Coal Company <br />August 25, 2017 <br />U.S. Environmental Protection Agency <br />Energy Strategies Group <br />109 TW Alexander Dr., D243-01 <br />Research Triangle Park, NC 27711 <br />Mountain Coal Company, LLC <br />West Elk Mine <br />5174 Highway 133 <br />Somerset, CO 81434 <br />Michael J Peacock, P.E. <br />Environmental Engineer <br />moeacoek0amb5cal.com <br />phone: 970 929 2301 <br />Re: Mountain Coal Company, LLC - West Elk Mine, Annual Performance Evaluation <br />To Whom It May Concern: <br />Mountain Coal Company, LLC (MCC) submits the attached Method 9 performance evaluation <br />results as required by 40 CFR 60.258(d) Subpart Y for coal processing equipment in operation at <br />the West Elk Mine. MCC conducted and submitted the last performance evaluation on <br />December 7, 2015, when the plant was in full -operating mode. <br />The plant was restarted as of August 812017, and the coal processing equipment is again in full <br />operating mode and the performance evaluation for this equipment was performed on August <br />25'', 2017. Results were less than half of the applicable opacity limit, which means that the next <br />scheduled performance evaluation will be in 12 months provided the equipment is operating in <br />full operating mode at that time. <br />Should you have questions or require additional information, please contact me at <br />(970) 929-2301. <br />Sincerely, <br />Michael J. Peacock, E. <br />Environmental Engineer <br />Enclosures: Method 9 Observation reports <br />cc: K. Welt <br />W. Norris <br />Availability of Records File <br />