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MOUNTAIN COAL <br />~' ~COMPANVt..t..~. <br />A Subsidiary of Arch Weskm Resources. LLC <br />December 3, 1998 <br />Mr. Jim Burnell <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />iii iiiiiiiiiiiii iii <br />999 <br />West Elk Mine <br />P O Box 591 <br />5174 Highway 177 <br />RECEIVED Somelrsg 0)929-5015 <br />Fax (970)929-595 <br />DEC 09 1998 <br />Division of Minerals i4 Geology <br />RE: Minor Revision No. 256 (As-built Run-of--Mine Pad Expansion); West Elk Mine; <br />Permit No. C-80-007 <br />Deaz Jim: <br />Mountain Coal Company, LLC (MCC) provides the enclosed minor revision to include the <br />original design drawings and slope stability analysis of the run-of--mine (ROM) pad expansion <br />(as were submitted and approved with Minor Revision No. 240) and a slope stability analysis of <br />the as-built expanded pad. Please find enclosed three copies of each of the items listed above to <br />be incorporated into Exhibit 43A (a new exhibit), revised table of contents and an application <br />form. <br />MCC designed the outslope of the ROM pad expansion with 2H:1 V slopes. However, due to <br />actual field conditions, the east end of the fill slope of the pad expansion was steepened to slopes <br />of 1.38H:1 V. As the slope had to be steepened, MCC had engineered and constructed a rock <br />buttress on the slope to ensure stability. During construction, MCC did not encounter any water <br />or damp soils, and performed numerous compaction tests in which the mean compaction was <br />neaz 95.8 percent. <br />The as-built contours and drainage of the expanded pad were included in Maps 53 and 54 <br />submitted with Technical Revision No. 86. <br />Please call if you have any questions. <br />Si <br />Christine E. <br />Permitting <br />cc: Henry Barbe <br />Phil Schmidt <br />Kathy Weit <br />mr256.doc <br />