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Mountain Coal Company <br />West Elk Mine <br />Post Otfce Box 591 <br />Somerset, Colorado 81434 <br />Telephone 970-929-5015 <br />November 20, 1997 <br />RECEIVED <br />NOV 2 4 1997 <br />Division of mmerais 8 Geology <br />Mr. Michael Boulay <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />III IIIIII~IIIIII III <br />/\ <br />RE: Minor Revision No. 231 (Slope Stability Projects); West Elk Mine; <br />Permit No. C-80-007 <br />Dear Mike: <br />As per Susan Burgmaier's request regarding the above referenced minor revision, <br />please find enclosed three copies of revised designs for culverts Cl-1 and C1-2. The <br />designs were requested as MCC has revised the minimum size of the culvert for C 1-1 <br />and C1-2 from a 27-inch CMP to a 24-inch HDPE pipe. The enclosed designs show <br />that the pipe installed is more than adequate to carry 14.15 cfs and 12.17 cfs. The <br />enclosed designs should replace the current designs for C1-1 and Cl-2 in Exhibit 61i. <br />Please call if you have any questions. <br />Sincerely, <br />Christine E. <br />Permitting ! <br />cc: Noun Every <br />Kathy Welt <br />rrv2J 1 a.doc <br />