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MINING PLAN EXHIBIT D (CONT~ <br />include mostly commercial uses and a water storage reservoir with <br />limited rural residential areas. <br />Access to the site is via 2 existing driveways; one from the <br />I-76 Frontage Road on the east side and the other down a private <br />lane from Dahla St. to the north. The driveways will be widened <br />and maintained as needed and will remain when mining is complete. <br />Since the lane is an existing private road that will remain when <br />reclamation ends, it is not included as part of the permit area. <br />GEOLOGIC SETTING <br />The affected lands are located along the South Platte River <br />in a Quaternary age, Piney Creek alluvial deposit. The eastward <br />dipping beds of Upper Cretaceous age are overlain at an angular <br />unconformity by the Pine Creek alluvium. The sand and gravel <br />encountered in the Piney Creek alluvium are a result of water <br />erosion and redeposition of rock materials from the front range <br />of the Rocky Mountains. The deposition of this material occurred <br />during a time when the river was much larger than it is now. <br />This type of material is typically found from south of <br />Denver to the Colorado state line along the South Platte River. <br />Along this section of the river, the deposit has a 60% rock, 40% <br />sand ratio and averages 15 feet deep. <br />SOILS AND OVERBURDEN <br />See the soils and vegetation information in Exhibit I/J for <br />detailed information regarding the soils on this site. The soil <br />information is not site specific, it describes in general terms <br />the nature of the soils found at this site and was obtained from <br />the USDA soil survey for Adams County. <br />Approximately 2% of this site is covered by structures so <br />there is little soil in and around them. Of the remaining 13.42 <br />acres, 1.26 acres are gravel driveways, parking areas or roads <br />that have no topsoil on them. Overlying the gravel deposit on <br />the rest of the area is a thin layer of soil that varies from <br />zero to 8 inches, averaging 5 inches overall. Underlaying the <br />soil is a clayey, sandy, loamy overburden that is between 10 and <br />14 inches deep and can be used for soil if needed. The topsoil <br />and salvageable overburden will be stockpiled for use then <br />reclamation begins. Since a majority of the land will be devel- <br />oped as a commercial site only 4.08 acres ± will need resoiling <br />and revegetation. <br />4 <br />