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i • <br />• 2.0 Site Description <br />2.1 Geology <br />A description of the geology in the vicinity of the Schwart~walder Mine <br />is discussed comprehensively in the literature. (See most recent literature <br />reference: Young, E. J., 1977. Geologic, Radiometric and Mineralogic Maps <br />of and Underground Workings of the Schwartzwalder Uranium Mine and Firea - <br />Jefferson County, Colorado. USGS open file report 77-725, 38 pages.) <br />Accordingly, this section will be limited to the subsurface site conditions <br />underlying the sorter. <br />During 1974, a study was conducted to determine the character of the <br />subsurface soil and bedrock and the location of the groundwater table. Based <br />on these data, foundation design recommendations were incorporated into the <br />• construction of the ore sorter. The subsurface conditions at the site were <br />investigated by drilling five bore holes to depths ranging from 18 to 39 1/2 <br />feet below the existing ground surface. The bore holes were drilled with a <br />truck-mounted, rotary drilling rig using 4-inch, continuous-flight, heavy-duty <br />augers. The locations of the borings are shown on Figure 1.1-2. <br />The ore sorter is located in the valley of Ralston Creek whi~:h flows <br />south through the site. Geologically, the site is situated above Pr~acambrian- <br />age bedrock at the extreme eastern edge of the Front Range of the Ro~:ky <br />Mountains. Although the valley formed in the Precambrian rock is V-:shaped, <br />the natural topography at the site is relatively flat because of the alluvium <br />deposited by Ralston Creek. The flat surface of this site is built up with <br />graded piles of non-uranium bearing waste rock from the mine which ra~.nge to <br />approximately 30 feet in depth from the natural around level. Most of the ore <br />sorter building is situated on a terraced waste rock area. <br /> <br />