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Mountain Coal Company <br />w«~ F~ nary. <br />aosi om~ Box Ss1 <br />Snnaxt Calando B1~3a <br />Takphons 3ai 7135015 <br />Fex 3a3 9'2}55.4ri <br />August 2, 1992 <br />V U <br />RECEIVED <br />Ms. Christine E. Johnston AUG 2 19J3 <br />Division of Minerals and Geology <br />Office of Mined Land Reclamation Division of Minerals a Geoloyy <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: West Elk Mine, Permit C-80-007, Partial Responses to Technical <br />Revision #63 Adequacy Review, May 5, 1993 <br />Dear Christine: <br />Mountain Coal Company (MCC) has prepared some responses to the <br />adequacy review questions for Technical Revision No. 63 in <br />conjunction with responses prepared for Exhibit 66 of Technical <br />Revision 64. The following responses to questions to 3, 4, 5, and <br />6 have been supplemented by modifications to pages 23-30 of Exhibit <br />51. <br />~3. Mountain Coal has chosen to Update Exhibit 51 to reflect the <br />fJpu„i'~c~Gn current designation of the ditches surrounding the lower <br />~ ~ ¢3r%Vi'~tO~ refuse pile, in accordance with Exhibit 66. Ditch,D6-1 is the <br />fi....41. ~:L..l. TL-'f .. L1, .. [..... L1.......4 .i: L..Y. TL-~ .. Li... T. ~e.f <br />ditch, and D6-4 is the South ditch. <br />(ti(~,,,,~I 4.~ The characteristics of the drainage design associated with <br />~~,~-f ,q3 Phase IV of the Lower Refuse Pile have been modified on pages <br />23-30 oP Exhibit 51. <br />".U/n10) <br />~~}~,~J~ 2 tv~ 5:~ The designs for MB-6 currently, demostrate that Pond MB-6 can <br />~ f3 i.~;~p\ primarily contain the 25-year 24-hour storm event per Rule <br />~ J 4.05.6(6). <br />°r`6.)~ The Clean Water Ditch characteristics enumerated in Table 13 <br />~.U,~'~~'9~yY'"0 do describe Ditch DCW-2. Table 13 has been modified to <br />~t~ ~,~' reflect changes in the design for this ditch during Phase IV. <br />G <br />Please call if you have any questions. <br />Sincerely, <br />7~' I <br />Katherine G. Welt v <br />Mountain Coal Company <br />