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MOUNTAIN COAL West Elk Mine <br />COMPANY 517 Highway 591 <br />L.L.C. 5174 Highway 81 <br />A Subsidiary of Arch Western Bituminous Group, LLC (97434 <br />(9700)) 9929- 29 -22200 810 <br />Fax(970)929 -5050 <br />October 27, 2010 <br />Mr. Tom Kaldenbach <br />Colorado Division of Reclamation, Mining and Safety <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C- 1980 -007; Minor <br />Revision No. MR -372, Subsidence Survey Monument Spacing and Monitoring <br />Accessibility, Response to Adequacy Questions <br />Dear Mr. Kaldenbach: <br />In response to the Division's adequacy comments in your October 28th letter, Mountain Coal <br />Company, LLC (MCC) submits the following responses. <br />1. MCC revised the sentence on page 2.05 -150 as directed to read, "Stock ponds will be <br />surveyed assuming climatic and ground conditions allow reasonable and safe access <br />for such monitoring." <br />Please contact me at (970) 929 -2238 or by e -mail should you have questions regarding this <br />submittal. <br />Sincerely, <br />ev l ti O ff <br />Kathleen G. Welt, <br />Environmental Engineer III <br />cc: Doug Nolte — MCC <br />