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before the water is pumped to the South Platte River and Big Dry Creek using a <br />groundwater discharge pump in accordance with Colorado/NPDES discharge permit <br />regulations. If agreements are obtained, water may also be discharged in the Lupton <br />Bottom Ditch and Brighton Ditch. Pipes transporting the water from the mine will <br />discharge the dewatering water directly into the South Platte River or identified waterway. <br />Water may also be pumped into adjoining cells. <br />When the alluvium is sufficiently dry, front-end loaders will excavate the material and <br />deposit it on conveyors. The mining face will be nearly vertical to %Z:l slope. The <br />conveyors will transport the material to be processed at the Plant Site area, located in Phase <br />The Plant Site area contains the crushing, screening and washing equipment used for the <br />processing of the raw materials. The processed materials will be used on-site at the <br />concrete and asphalt plants and delivered off-site for commercial and government projects. <br />The process area will also include a concrete casting facility where concrete forms will be <br />made for construction projects. The Plant Site area will be approximately 40 acres and will <br />be the last phase mined. <br />All mine areas will drain internally. Uncontrolled releases of surface water and sediment <br />from mining areas will not occur. Storm water collected in the open pit will be managed in <br />accordance with Colorado/NPDES discharge permits requirements. Sediment generated <br />from localized Storm water runoff and surface drainage will be managed according to the <br />Stormwater Management Plan, enclosed in Exhibit G. An existing drainage located on the <br />eastern edge of Phase 1 will be improved for use as a surface water diversion ditch around <br />the Plant Area, see enclosed Proposed Diversion Channel Design at the end of this Exhibit. <br />Water rights at the Site will be used for dust control operations along the roads and <br />stockpiles. The Water Balance spreadsheet located in Exhibit G estimates the gallons per <br />week necessary to limit dust emissions. The water will be supplied using a 2500-gallon <br />water track. <br />Overburden <br />Topsoil and overburden will be stripped with scrapers or dozers and placed separately in <br />temporary stockpiles within the permit area limits. The topsoil will be segregated and <br />stored separately from the overburden material as required by Rule 3.1.9(1). The topsoil <br />will be placed in berms around the perimeter of the mine cells and will also serve as visual <br />barriers where appropriate (see Exhibit C). The berms are not expected to exceed 30 feet in <br />height and will have maximum 2:1 side slopes. The topsoil stockpiles will be protected <br />from wind and water erosion by vegetative cover (see Upland Areas Seed Mix, page 20). <br />The stockpiles will be broadcast seeded and incorporated into our weed control program. <br />Weed control consists of monthly inspections and, if necessary, chemical treatments in the <br />applicable fall and spring seasons. Topsoil stockpiles that will be in place for less than one <br />year will not be vegetated. <br />Ft. Lupton Pit <br />DMG 112 Perini! <br />Page !3 oj86 <br />