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topsoil will be stripped and stockpiled prior to mining operations. The height of the topsoil <br /> stockpiles will be approximately 35 feet. <br /> Mine Phasing <br /> CCWCD anticipates mining and reclaiming the 32.42-acre Phase 1a and Phase 1 North cell and <br /> the 40.11-acre Phase 2a and Phase 2 South cell for the Sweet Valley Pit progressing as shown <br /> on the Mining Plan Map. The overall time required to complete the mining and reclamation is <br /> estimated to be 11 years and 8 months based on an average rate of 650,000 tons per year. The <br /> initial production is expected to be 300,000 tons per year with the maximum production <br /> expected to be 1,000,000 tons per year. However, it is possible that due to demand fluctuations, <br /> mining could progress slower than anticipated and additional time may be required for mining <br /> and reclamation of the site. The mining will progress beginning with the Phase 1a cell at the <br /> outer edge where material will be moved toward the interior such that the mining slope can be <br /> established. The Phase 1a cell mining slope will be established for the entire perimeter in 3 to 6 <br /> feet intervals then when groundwater is exposed after the slurry wall construction the same <br /> process will occur for Phase 1. Once the mining of the Phase 1a and Phase 1 cell is completed, <br /> mining of the Phase 2a and Phase 2 cell will begin by mining the outer edge where material will <br /> be moved toward the interior such that the mining slope can be established. The Phase 2a cell <br /> mining slope will be established for the entire perimeter in 3 to 6 feet intervals then when <br /> groundwater is exposed after the slurry wall construction the same process will occur for Phase <br /> 2. <br /> Dewatering <br /> Dewatering trenches will be placed along the perimeter of each mining area. The dewatering <br /> trench around the perimeter of each cell being mined will be placed at the toe of the mining <br /> slope. As the cell is mined deeper the dewatering trench will be lowered and moved laterally <br /> along the mining slope toward the center of that cell. Slurry walls are anticipated to be installed <br /> around the perimeter of each cell prior to exposing groundwater and mining will continue to <br /> commence in those cells. It is expected that minimal dewatering will be required after the slurry <br /> walls are installed due to the slurry walls cutting off groundwater infiltration into the cells. <br /> CCWCD will have an approved substitute water supply plan and well permit prior to exposing <br /> groundwater. The substitute supply plan will be updated annually to account for water that is <br /> consumed due to exposing groundwater by the mining operation. <br /> Explosives <br /> Explosives will not be used during mining. <br /> Central Colorado Water Conservancy District <br /> iiira•' J&T Consulting,Inc. Sweet Valley Pit <br /> DRMS 112 Permit Application <br />