2002-11-05_REVISION - M1983176 - Laserfiche WebLink

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ASPHALT SPECIALTIES CO. Water Diversions. Impoundments and Evaporative Losses Stormwater from all areas of surface disturbance in the amendment area, as well as the previously approved permit azea, will be directed toward the mine's dewatering systems, by grading and shallow ditches. After the water is clazified and the sediments collected, the water will be discharged to the South Platte River. An amended CPDS permit will be obtained for the dewatering operations and storrnwater runoff. Aggregate processing water will generally be separate from the dewatering and stormwater systems. With evaporation and product moisture losses, there will continue to be little need to dischazge process water. Almost all of the process water is diverted back to the processing water system in the settling ponds, as shown on the Mine Plan Map, Exhibit C-2. Some "make-up" water is continually obtained from the dewatering system to recharge the freshwater settling pond. This is due to loss of some of the process water from draining of the stockpiles. The settling ponds at the southern end of the property are maintained below existing grades, so that any precipitation will be retained in this area. Dewatering quantities will increase as the excavation enlarges, with the additional 11.4 acres of mining amended onto the origina3 permit azea, before the first phase of the clay liner is constructed. The quantities of groundwater pumped should then decrease, with gradual increases occurring as the mining azea expands into the amendment area. With additional clay liner constructed, pumping amounts of inflowing alluvial groundwater will decrease. When the final phase of clay liner is completed, the dewatering quantities will once again decrease and continue to do so until the residual groundwater in the pit is pumped out. ASCI will amend its currently approved and operating Substitute Supply Plan to account for increased losses due to the expanded area of mining. ASCI has acquired sufficient shazes of Fulton Ditch water to easily accommodate the evaporative losses in the amendment area. Timetables for Mining and Reclamation Operations Revised timing of mining and reclamation operations anticipated by ASCI, due to the addition of the amended area and dependant on market demand, are summarized below: Phase Year Mining in Area Mined Acres Reclamation in Area 1 1-2 1,2 15.1 1,2 2 3-4 3 11.4 1,3 3 5-6 1,4 15.0 3 4 7 NA NA 1,3,4 Speer Mining Resourcc 1 I October 7, 2002 Asphalt Specialties Company, Inc. DMG Permit Amendment No. 2