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,_ ~ III IIIIIIIIIIIIIIII ~ ~* "`f SNOWMASS COAL COMPANY Mrne Ollica: Denver Orlice: tdarch 7, 1984 P.D. Box 960 Carbontlale. Colorado 81623 (303) 9633440 Suite 2300 410 Seventeenth Street Denver, Colorado 80202 (303) 8257966 RECEIVED M,4R 91984 Mr. Robert Liddle Mined Land Reclamation MINED LAND RECLAMATION DIVISION Department of Natural Resources Colo. Dept. of Natural Resources 1313 Sherman Street, Room 423 Denver, CO 80203-2273 RE: Technical Revision for Truck Scale Installation at North Thompson Creek Mines, Permit No. C-025-81 Dear Mr. Liddle: Snowmass Coal Company hereby requests a Technical Revision to Permit No. C-025-81 to allow the installation of truck weighing scales near the entrance of the North Thompson Creek Mines. As shown on the enclosed map, the new truck weighing scales will be located approximately due north of the Washer Plant. In order to locate these scales in this area it will be necessary to enlarge the existing road cut. Approximately 1100 cubic yards of Mancos Shale will need to be cut out at a slope of 1H:1V. All topsoil removed from this area will be stored in our topsoil storage area. All excavated rock will be used for rip-rap if possible. If the rock is not usable as rip-rap it will be placed in our refuse pile. Immediately adjacent to the truck scales a small metal or wood building will be constructed to house the weighing equipment. This building will be notched into the hillside as shown on the enclosed map. The proposed location of these truck scales lies directly over ditch D-6 which carries undisturbed water to pond P-4, In order to maintain this conduit, Snowmass proposes to install a half-section piece of 36" diameter culvert pipe. If this pipe is placed on a slope of 28, it will be able to safely pass 25.5 cfs of water. The 10 year 24 hour peak flow for this ditch is 20.7 cfs. This half-section of pipe will be installed so that no drainage from the truck scales will mix with the undisturbed water.