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3037219298 GREYSTONE <br />October 5, 1993 <br />Ms. Christine Johnston <br />Colorado Division of Minerals & Geology <br />1313 Sherman, Room 215 <br />Denver, CO 80203 <br />005 P01 OCT 05 '93 18:08 <br />Subject: Adequacy Responses, Mountain Coal Company, West Elk Mine, <br />T.R. 65, Permit C-80-007 <br />Dear Ms. Johnston, <br />I am providing revised SEDCAD+ runs, culvert Homographs, and tables <br />in response to your telephone call on October 5, 1993. <br />tle Page, Watershed 18B <br />bwatershed/Structure Input/Output Table, Watershed 188 <br />-1fAlveady~n Er~~h~L~4 <br />p3-z / <br />Exhibit 51, page 2,6~ <br />Exhibit 51, page 28 <br />Table 43 <br />Table 44 <br />Your estimation of the amount of water in D2R-3 and D2R-1 underes- <br />timated the contributions from the lower Sylvester Gulch area, <br />since the value for C2R-3 on Table 44 was low. <br />C2R-4 8.35 cfs <br />WS 28 0.06 efs <br />WS 18C 2.71 cfs <br />WS 18 11.06 cfs <br />Sub-total 22.18 cfs D2R-3 <br />WS 18A 3.35 cfs <br />Total 25.53 cfs D2R-1 <br />In response to question 3, Miscellaneous Paqe Changes of the <br />September 17, 1993 Adequacy Letter, please accept this revised <br />response. <br />Table it of Exhibit 51 describes a pond which services the refuse <br />disposal area (previously MB-6). The discrepancy on Refuse <br />Disposal Area (RDA) acreage is a function oP the acreage which <br />drains into the RDA pond. The total acreage associated with the <br />6990 Greenwood Plaza Blvd. Suite 250 Englewood, CO 80111 <br />(803) 8b0.0930 Fax (308) 721-9298 <br />