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Mountain Coal Company <br />September 25, 2015 <br />Mr. Leigh D. Simmons <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Mountain Coal Company, LLC <br />West Elk Mane <br />P.O. Box 591 <br />Somerset, CO 81434 <br />Kathleen G. Welt <br />Environmental Engineer III <br />kwelt@archcoal.com <br />phone: 977.929.2238 <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No, C-1980-007; <br />Minor Revision No. MR -414; Addition of Concrete Vault to Pond Pipeline <br />Project <br />Dear Mr. Simmons: <br />Mountain Coal Company, LLC (MCC) submits this letter and application form for Minor <br />Revision No. MR -414 to add the installation of a precast reinforced concrete vault to the <br />pipeline project previously approved in Minor Revision MR -409. This buried vault will be <br />constructed of 6" thick reinforced concrete and will be about 4' wide x 6' long x 4' deep. The <br />valves and meters for the pipeline that will be housed in this vault will be accessed through a <br />manhole. <br />Contact me at (970) 9292238 or by e-mail should you have questions regarding this <br />submittal. <br />Sincerely, <br />Kathleen G. Welt, <br />Environmental Engineer III <br />CC" Jessica Loveland — MCC <br />Weston Norris - MCC <br />Neal Starkebaum - Gunnison Co. <br />