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6.4.4 Exhibit D <br /> Mining Plan <br /> 1. Location and General Land Use Information <br /> The site is located along Huerfano County Road 650 and Interstate 25 and is composed of <br /> dry rangeland. The parcel is currently leased for agricultural operations by the Colorado <br /> State Land Board. <br /> 2. Site Geology and Vegetation <br /> Site geology consists of 3-4 inches of topsoil. Mining will occur to a depth of approximately <br /> 20 feet. There are no hazardous or acid forming materials expected to be encountered during <br /> excavation. See the enclosed Natural Resources Conservation Service (NRCS) soil report for <br /> more details on surface composition. A majority of the site is composed of Baca Silt Loam. <br /> This material is well drained with slow to medium runoff and moderately slow permeability. <br /> These soils are used for both rangeland and for irrigated cropland. Native vegetation is blue <br /> grama,buffalograss, western wheatgrass,broom snakeweed and cactus. Vegetation at this <br /> site is typical rangeland grasses for this area and covers approximately 30-60%of the site. <br /> Samsil-chicosa complex is also on the property and is found in rangeland. The main native <br /> vegetation includes little bluestem,western wheatgrass, sideoats grama,blue grama, green <br /> needlegrass, sedges and forbs. It is well drained and has a medium to high surface runoff. <br /> Permeability is slow. <br /> 3. Surface Hydrology <br /> Pre-mining topography is shown on the Existing Conditions Map. All runoff on the <br /> undisturbed site runs to the south. Stormwater will be kept from leaving the site by using <br /> topsoil and overburden stockpiles which will surround the site following the perimeter. The <br /> stockpiles will be first developed on the western edge of the site and will encircle the full area <br /> over the mine's life. This perimeter topsoil berm is shown on the Mining Map. Stormwater that <br /> occurs on site will remain on site; however,the soils should allow for stormwater to infiltrate <br /> the site and pit floor within 72 hours. <br /> Based on data from the Division of Water Resources Well Permit Search map,groundwater <br /> Page 6 of 24 <br />