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1 <br />1 <br />r <br />' E+irthmoving will be accomplished using scrapers and front end <br />loaders. Topsoil will be removed and stockpiled separately from <br /> o~rerburden. Field investigations indicate topsoil depths ranging <br /> from 0 to 7-1/2 feet with an average depth of 3 feet. Typical <br />' s~_ockpiles will be 10 feet in height, 50 feet wide and will <br /> contain 7,000 cubic yards of material. See Exhibit C for <br /> proposed locations of stockpiles. A large portion of the mining <br /> area lies within the 100 year floodplain for St Vrain Creek as <br />' determined by the Federal Emergency Management Agency. Wherever <br /> possible, stockpiles will be aligned with the general direction <br />' o:E flow to minimize erosion of stockpiles during flooding. <br /> Two lakes will be created by the mining operation. These lakes <br /> w:Lll have a surface area of 40.3 and 38.3 acres.(See Exhibit C). <br />' A small three cell settling pond will be constructed at the plant <br /> sate for providing wash waters to the plant. Each cell will be <br /> a~~proximately 75 feet wide and 100 feet long. The average depth <br />' wall be 15 feet. <br /> Ttie sequence of mining activities that will be done are as <br /> follows: <br />' <br /> 1. Topsoil and overburden will be stripped and stockpiled. <br /> 2. A dewatering trench will be constructed around the perimeter <br />' of the mining phase. <br /> 3. A portable dewatering pump will be installed and groundwater <br /> will be discharged to St. Vrain Creek. <br />' 4. Sand and gravel will be extracted and placed on a conveyor <br />system. <br /> 5. The sand and gravel will be transported via conveyor to the <br /> plant site for screening, crushing and washing. <br />' 6. Processed material will be stockpiled at the plant site and <br /> trucked from the property to end users. <br />1 <br />~J <br />1 <br />1 <br />1 <br />D-2 <br />