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I <br />RECEIVED BY FAk <br />SEP 1 ; 1995 <br />Mountain Coal Company Exhibit 67 <br />West Elk Mine Windy t3ap Pttocess <br />Dlatusslan <br />The following information here been compiled using dsn that is wasistmt with the 8.2 <br />million mm per Year (TPY) Production me expected u the West Elk Mlne lW~ <br />through the permit tam ending August, 2001. Although wEM has aot yes reached the <br />maximum prvductiott level, the following mlculadons reprment the depletion to the <br />NoNr Fork of the Gunniwn River (North Fork) u this maximum production rate, <br />Depletions from the North Fork by W8M caa be attributed ro stemm flow diversions <br />under WEM's existing water tights. <br />Return flows m tite North Fork from WEb1 can be attributed w treated water from both <br />the Waste Water Traanene Plant (W WZ'p) and water circulated through the mine. Other <br />contributions include treated water from non-alluvial groundwater in the mine wurkings. <br />Depletions <br />,, <br />WEM pumps water from the North Fork inm a 10 acre-foot storage pond. Warr may <br />also be pumped from the North Fork directly m the water treatment plant or~.intn the <br />mine and/or WEM's new 1.2 million gallon taw ware storage tank. WF.bt also utilizes <br />water stontge rights contained in three sedimentation ponds on the WEM site and a right <br />m waxy produced in the mina At a production rate of 8,100,000 TPY, WF.M~'s likely <br />maximum water requirement is estimated u approximately 150 urerfat per year and the <br />very conservative maximum water requitement is approximately 300 acre-feet per year. <br />Wader use for underground dwt suppression is estimated u 2lr: of production <br />menage. 13axd upon an annual coal production of 8,200,000 TPY, <br />approximately 134.6 acre-fat of water per year is depleted as a result of dwt <br />suppression. This number includes water leaving the mine as added moisture an <br />coal and gob. <br />PQ~ Evaeeraden <br />i <br />An estimate of 45 inches per year for Clau A pan evaporation was obtained from <br />USWB TP 37, 1959. A put coefficient of 0.75 was used to obtain an annual <br />pond evaporation atimax of 33.8 inches per year. Singe all preeipitadon <br />reaching the ponds would be available for release or evaporation, the net <br />evaporaion is 13.7 inches per year (using an annual precipitation of 20.1 inches). <br />Consequently, for a coral pond surface area of four ocres, the annual ev~poradon <br />loss is 4.6 acre-feet. <br />Erchibit 67-1 <br />~~ <br />Reeed JR ltAt 71ter: R..vr rep. lt+7t tall <br />k~ <br />