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1 <br />1 <br /> <br />' E;arthmoving will be accomplished using scrapers and front end <br />l:~aders. Topsoil will be removed and stockpiled separately from <br /> overburden. Field investigations indicate topsoil depths ranging <br /> from 0 to 7-1/2 feet with an average depth of 3 feet. Typical <br />' stockpiles will be 10 feet in height, 50 feet wide and will <br /> c~~ntain 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 />' d~atermined by the Federal Emergency Management Agency. Wherever <br /> p~~ssible, stockpiles will be aligned with the general direction <br /> of flow to minimize erosion of stockpiles during flooding. <br />' <br /> Tivo 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 /> approximately 75 feet wide and 100 feet long. The average depth <br /> will be 15 feet. <br /> Tl~e sequence of mining activities that will be done are as <br /> fellows: <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 /> <br /> <br /> <br /> <br /> <br />' D-2 <br />