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MOUNTAIN COAL West Elk Mine <br />COMPANY <br />L.L.C. <br />A Subsidiary of Arch Westem Bituminous Group, LLC <br />October 07, 2010 <br />Mr. Tom Kaldenbach OCT 14 4010 <br />;n?,;,, <br />Colorado Division of Reclamation Mining and Safety <br />Office of Mined Land Reclamation Own slid §a' <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Mountain Coal Company, LLC, West Elk Mine; Permit No. C-1980-007; Technical <br />Revision No. 122, Update of Ditch and Culvert As-Builts in Exhibit 66 <br />Dear Mr. Kaldenbach: <br />Mountain Coal Company (MCC) submits the attached revision from, proposed public notice <br />and information for Technical Revision No. 122 to Mining and Reclamation Permit No. C-1980- <br />007. This revision updates MCC's Mine Water Control Plan in Exhibit 66 with the as-built <br />ditches and culverts designs approved in TR-119 and TR-120. Slight modifications of the ditch <br />and culvert layout design occurred during construction of both the MB-5E pond and the Coal <br />Preparation Plant. Tetra Tech was hired to update the SedCad analysis, maps, text, and <br />tables. <br />Attached are the revision form, public notice, and new Exhibit 66,Volumes 8A and 8A (2), <br />showing the ground-truthed locations of all ditches, culverts, sub-watershed basins, and new <br />Maps 54, 5413, and 54C. <br />MCC removed the following from Exhibit 66: <br />• SAE - Designs for presedimentation basin and other treatment facilities from MR 232 <br />for the Mine Dewatering Facility that were never constructed. <br />• SAE - SedCad results for the east side of the lower storage bench and west side of <br />pond MB-1 spillway channel. This previous SAE now drains to pond MB-5E. <br />• SAE - SedCad results for the west side of the lower storage bench and pond FWA. <br />This previous SAE now drains to pond MB-5E. <br />• Lone Pine Gulch - The SedCad results and designs for the Lone Pine Gulch <br />Minewater Treatment Pond that was never constructed. <br />Please feel free to contact me should you have further comments or questions regarding this <br />submittal. <br />Sincerely, <br />Ryan . Sweetwood