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Mining Plan <br />(a) Contract duration for this Colorado Department of Transportation (CDOT) contract is <br />305 working days. Commencement of mining is planned for August, 1999 and is to be <br />completed by December, 2000. Work activities are scheduled five days a week, seven to <br />ten hours per day. <br />(b) The estimated depth of topsoil, suitable as a plant growth medium, to be salvaged and <br />stockpiled for use in the reclamation process is six inches. The topsoil stockpile will be <br />located separate from other stockpiles, out of the way of construction traffic and out of <br />stream channels and drainageways. Refer to Exhibit E for a map of the topsoil stockpile <br />location. The topsoil will be stripped and stockpiled using conventional construction <br />methods, primarily dozers and scrapers. <br />(c) The estimated depth of overburden to be removed from the project area is 2 to 4 feet. <br />Overburden will be stockpiled and used later in the reclamation process. Please see <br />Exhibit E for the location of the overburden stockpile. <br />(d) The gravel area will be excavated up to 20 feet deep . <br />(e) The major components of the proposed project include the pit area, crusher, <br />dewatering trench, settling/discharge pond, lab trailer (with bottled water), porta johns, <br />and access road (which already exists, but needs some minor improvements in the <br />immediate vicinity of the proposed pit). Total disturbed area will be approximately 22 <br />acres. Please see Exhibit B for the locations of all plan components. <br />(f) The proposed pit dimensions for borrow area are 160 to 600 feet wide by 950 feet <br />long. Topsoil and overburden will be stockpiled in two separate locations at the east end <br />of the pit. The topsoil stockpile will measure approximately 60 feet wide and 350 feet <br />long. The overburden stockpile will measure approximately 70 feet wide by 500 feet <br />long. The settling/discharge pond will be 120 feet by 120 feet in size. Crushing <br />operations will take place in an area no larger than five acres. Please see Exhibit E for <br />the locations of these components. <br />(g) A rough access road already exists from La Plata County Road 100 to the project site. <br />The road will require improvements (per the conditions of Nielsons La Plata County <br />Class H land Use permit). These improvements will include widening from ten feet to 15 <br />feet at several locations for passing, softening of tight curves, and a low water culvert <br />crossing of the La Plata River. The crossing will be permitted under a USACOE NWP <br />#14 (currently in process). Design of the crossing will be to La Plata County and <br />USACOE specifications. Please see Exhibit E for the location of these components. <br />(h) Approximately 500 M gallons of water will be used on-site for crushing and dust <br />control. This water will come from exposed groundwater as a result of pit excavation.