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MOUNTAIN COAL <br />~ ~ COMPANY~.~.~. <br />A Subsidiary of Arch Western Resources, LLC <br />July 20, 2005 <br />Mr. James Burnell <br />Colorado Division of Minerals and Geology <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEOVED <br />JUL 212005 <br />Qlvieron W Minerals and Geology <br />Re: Phase I Bond Release, West Elk Mine (SL-Ol) lgt Adequacy Letter Responses <br />Dear Mr. Burnell: <br />West Elk Mine <br />P O Box 591 <br />5174 Highway 133 <br />Somerset, CO 81434 <br />(970)929.5015 <br />Fax (970) 929.5595 <br />Mountain Coal Company L.L.C. West Elk Mine is responding to the Division's first adequacy letter <br />dated October 25, 2004 for the Thermal Event Area (SL-Ol). At this time comments (1-3) regarding the <br />Thermal Event Area bond release in the October 25s' letter have been addressed. The original CDMG <br />• requests are numbered and italicized and MCC's responses to correct these requests are listed below. <br />MCC's responses are in bold type. <br />(1) Please provide certification by a registered professional engineer for the <br />cross-sections provided in the application package, according to rule 2.10.3(2) <br />MCC's Response: Attached are the certifications by a registered professional <br />engineer for the cross-sections provided in the application package, according to rule <br />2.10.3(2) <br />(2) Please provide a certified engineering report to show that the backfilled and <br />regarded slopes have a minimum static safety factor of at least 1.3, as required by <br />Rule 4.14.2(1)(6) <br />MCC's Response: Attached is a report from a certified engineer to show that the <br />backfilled and regarded slopes have a minimum static safety factor of at least 1.3, as <br />required by Rule 4.14.2(1)(6) <br />(3) The Thermal Event Area has been managed as a small area exemption (SAE) <br />since the original disturbance. The area hus been regraded and revegetated, but is still <br />considered a small area exemption. Please provide demonstrations for the individual sites <br />within the thermal event area to show that the drainage from the disturbed area does not <br />contribute suspended solids above the natural conditions and the quality of untreated drainage <br />meeting State and Federal water quality standards, as required by Rules 4.05.2(2) and <br />4.05.2(3)(a) <br />