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<br />MOUNTAIN COAL <br />COMPANY L.L.C. <br />A Subsidiary of Arch Western Resources. LLC <br />RECEIVED <br />JAN 2 q 2000 <br />January 19, 2000 <br />Mr. Jim Burnell <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Division of Minerab & Geology <br />RE: i'echnical Revision No. 86 (Sylvester Gulch As-built); West Elk Mine; <br />Permit No. C-80-007 <br />Dear Jim: <br />~II ~I~~I~~I~~~~~ ~I~ <br />999 <br />West Elk Mine <br />P O Bor 591 <br />517a Highway 133 <br />Somerset, CO S 1434 <br />(970) 929-i01i <br />Fax 19701929-ii9i <br />Mountain Coal Company, L.L.C. (MCC) provides the following supplemental information to <br />MCC's July 14, 1999 letter regarding the above referenced technical revision application. The <br />information is presented in corresponding order to the original adequacy questions asked by the <br />Division. Not all question numbezs are included in this letter, only those relating to the <br />supplemental information enclosed. <br />Svlvester Gulch: <br />3. Table 44E has been revised and is enclosed to show the correct flow of 20.2 cfs in DSLY- <br />17. and is enclosed. <br />7. A portion of watershed 42A1 (42A1A) flows into DSG-I and the remaining portion <br />(42AIB) flows into DSLY-13. DSLY-13 then flows into DSG-I. The enclosed SEDCAD <br />run for pond SG-I and Map lE (also enclosed) reflects this routing. Tables 43E and 44E <br />have also been revised to reflect this correction and are enclosed. Map 54B, submitted with <br />the July 14'" responses, reflects this change. <br />9. Table 44E has been revised and is enclosed to reflect the correct flow of 3.32 cfs in CSLY- <br />12. <br />10. The ditch sizing utility for DSG-2 was inadvertently left out of the July 14'h response <br />package. [t is now included as part of the pond SG-1 SEDCAD run. <br />12. The elevation-discharge table and elevation-area-capacity-discharge table for pond SG-1 <br />are included with the revised SEDCAD run, which is enclosed. <br />14. The non-pond structure input/output table containing the grass filter inputs for the SAES is <br />enclosed. <br />