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r Mountain Coal Company West Elk Mine Post Office Box 591 Somerset, Colorado 81434 Telephone 303 929-5015 ___1_-- _ ~.(Ui ~tfJ (~~~ ~~~~~~~~~~~~~ ~~~ ~~ July 1, 1993 Ms. Christine Johnston Colorado Division of Minerals & Geology Office of Mined Land Reclamation 1313 Sherman St., Room 215 Denver, CO 80203 I~F~t=1v~=c JUL 02 1993 Re: West Elk Mine, Permit C-80-007, Dlws~un u~ r~u~~era!~ o uu~loyy Response to Second Adequacy Review, TR 63, Lower Refuse Pile Reconfiguration Dear Christine: The following are Mountain Coal Company's (MCC) responses to questions in your second adequacy letter. The responses are numbered as presented in your May 5, 1993, letter. / 2.0 Descriation of Pile Configuration and Phasing 5 I ~/ 1. MCC has deleted the reference to curves depicting th~ elevation versus oi!/ capacity of the pile by phases, as the curves (Figures) 2.1 to 2.5 in the existing Exhibit 51 are out of date and the volume information is / sufficiently presented in Tables 1 and 2. p~/ v 2. Amore accurate density of 85 pcf was utilized in the revised Exhibit 51 Y~ S; n t1o~t 5 ' (o~+1Qpl,~coo-,4E5(S(see footnote #2). In the existing Exhibit 51, a density of 80 pcf was u il~to-k1 ~d~'~.0~ ~5pt~utilized. 3. The topsoil and subsoil volumes presented in Table 2.3 of the existing Exhibit 51 were based on four feet of cover. Subsequently, a variance to the four feet cover requirements was approved for the lower refuse pile to 'J an average cover of 18" to 24". The topsoil and subsoil volumes shown in Table 3 of the revised Exhibit 51 reflect the range of volumes required for the average cover depth (or 9" to 12" of both subsoil and topsoil). The maximum amount of topsoil for Phases I through III in existing Exhibit 51 is therefore different than in the revised Exhibit. a. See the explanation above and the footnotes for Table 3 in revised Exhibit 51.