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MOUNTAIN CQAL <br />~' ~COMPANY~.t..~. <br />A Subsidiary of Arch Western Resowces, LLC <br />October 26, 2005 <br />Mr. Tom Kaldenbach <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEIVED <br />ocr 312005 <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 />Divieron of MineraH and Caeology ~ ~ j ~, <br />"~i ~'7 <br />_, ~~.~ <br />RE: Mountain Coal Company L.L.C., West Elk Mine; Permit C-80-007, Thermal Event <br />Small Area Exemption, Minor Revision No. 311, (MR-311) and Lone Pine Bond Release, <br />Minor Revision No. 312, (MR-312). <br />Deaz Mr. Kaldenbach: <br />'~ Mountain Coal Company, L.L.C. (MCC) submits the Thermal Event Small Area Exemption RUSLE <br />Anayyis Report and the Lome Pine Small Area Exemption RUSLE Analysis Report by Greystone <br />Consultants to supplement the Minor Revision application for bond release of the Thermal Event <br />and Lone Pine area. <br />The Revised Underground Soil Loss Equation (RUSLE) report presents a soil loss analysis on the <br />seven Thermal Event Small Area Exemptions (SAE'S) and the four Lone Pine SAE's located at the <br />West Elk Mine (Permit # C-80-007). The purpose of this analysis is to demonstrate sediment <br />generated from a 10-year, 24-hour storm event from the Thermal Envent and Lone Pine SAE's is <br />equal to or less than sediment generated from adjacent undisturbed slopes. This evaluation <br />demonstrates that the erosion control structures protecting the reclaimed areas can be safely <br />removed and bond released. <br />We appreciate your consideration and cazeful review of this submittal and, as always, would be <br />happy to work with you to address any questions or concerns that azise during the review process. <br />Sinc <br />enry A. be <br />Environmental Engineer <br />ce: Pete Wyckoff <br />Phil Schmidt <br />Mike Peacock <br />