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i <br />MOUNTAIN COAL <br />COMPANYL.L.c. <br />A Subsidiary of Arch Western Resources, LLC <br />October 20, 2005 <br />Mr. Tom Kaldenbach <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />REDEIi/ED <br />OCT 212005 <br />Gihsion of Minerals and Geobpy <br />West Elk Mine <br />POBox 591 <br />5174 Highway 133 <br />Somerset, CO 81434 <br />(970) 929-5015 <br />Fax (970) 929-5595 <br />RE: Mountain Coal Company L.L.C., West Elk Mine; Permit C-80-007, Temporary <br />Placement of Pipes in an Existing Ditch(s), Construction of a Temporary Ditch, and <br />Temporary Expansion of the Run-Of--Mine (ROM), Coal Stockpile., Minor Revision No. 318, <br />(MR-318). <br />Deaz Mr. Kaldenbach: <br />As a result of our telephone conversations of October 20, 2005, with you and Mr. Daniel <br />Hernandez, MCC is submitting this minor revision. The revision is necessary and prudent to allow <br />MCC temporary additional raw coal stockpile capacity. <br />The proposed project consists of placing 320 lineal feet of 8" diameter High Density PolyEthylene <br />(HDPE) pipe and placing 320 lineaz feet of 6" diameter, perforated, Polyvinyl Chloride (PVC) pipe <br />in the existing shotcreted D2-2D and D2-2C ditches, as shown on Map 54. Additionally, a <br />temporary ditch will need to be constructed. This ditch, D2-2D(T), will be constructed in subsoil to <br />course water from the topsoil pile and anticipated slope of the ROM stockpile to the D2-2D ditch. It <br />will be a "V" shaped ditch 1.5 feet wide and 0.5 foot deep. The water will then be conveyed in both <br />the 8" HDPE and 6" PVC pipes to the invert of culvert C2-4, that is a 12- inch culvert. The purpose <br />of the 6" PVC perforated pipe is to drain water from the ROM Stock Pile, as well as, convey storm <br />water runoff from the topsoil pile to the C2-4 culvert. The calculations for the existing ditches and <br />culverts aze found on Table 44E of Exhibit 66. The two pipes and the temporary ditch are sized to <br />convey the ten-year, 24-hour event from their respective drainage azeas as shown on Map 54. <br />The azea where the activity is proposed has been previously disturbed. <br />Tentatively, MCC could begin this project on Sunday the 23rd or as soon as the minor revision to the <br />permit is approved. <br />Sinc `~Z <br />CX. <br />Henry A azbe <br />Environmental Engineer <br />