1983-04-26_PERMIT FILE - M1983067 (7)

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MINING PLAN Western Paving' s Stagecoach Stop Pit is an open pit mine located near Henderson at 124th Avenue and Brighton Road. There are two phases of the extraction operation, a dry pit phase and a wet pit phase. The life of the mine will be approximately eight years and produce 2,000,000 tons of commercial aggregate. Mining of the dry pit phase will begin with the removal of the topsoil and overburden. This material will be stockpiled around the perimeter of the pit for later use in reclamation. No soil stockpiles will be placed in the South Platte floodway. These soil stockpiles will also act as a sound barrier between the mining operation and adjacent landowners. (See Mining Plan Map. ) A portable crusher spread will be located near the area to be worked to crush, size and stockpile the gravel . The gravel stockpiles will not be positioned in the floodway. The access road will be wetted for dust suppression and the gravel processing equipment is fitted with spray bars which are kept in use during operating hours. Four (4) to twenty (20) feet of sand and gravel will be removed and processed during the dry pit phase. It is estimated that this phase will take approximately four or five years to complete. The second phase, the wet pit phase, will commence after existing gravel has been removed down to the ground water table. A draoline will be brought in and excavation will continue under water. • However, some water may be discharged to the South Platte River during this phase. The discharged water will be monitored and regulated under the authority of an N.P.D.E.S. permit. It is estimated that this phase will take another three to four years to complete. During the dry pit phase of this mine, dust suppression will be necessary. ',later for the dust suppression will be imported to the pit from a municipal water supply. 10,000 gallons of water per day will be necessary to suppress the dust during operation hours. Western Paving ' s Stagecoach Stop Pit will operate from the hours of 6:00 a .m. to 10:00 p.m. Adequate sanitary and water facilities will be provided and maintained for the mining crew. All such facilities shall be furnished in strict accordance ,with existing and governing health regulations. Tractor-trailer rigs will haul the gravel via the access road on the site onto Brighton Road, and then proceed eastbound on Highway No. 22 (124th Avenue) to U.S. 85. U.S. 85 will serve as the major road to the Adams County market area . It is estimated that this gravel mine will produce 250,000 tons of material per year. Approximately 70 percent of the vehicular traffic will be traveling to the southern Adams County market area . The remaining 30 percent will be traveling to the northern Adams County market area. •