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October 2000 -21- <br />• 3.1.7 Flood Plain <br />003-2191 <br />The entire azea of the depository is located in the hills above the river valleys to the <br />west. A review of the topography on Drawing 1 confirms that the proposed depository <br />is more than 150-200 feet above the potential flood plain. <br />3.1.8 Waste Isolation, Public and Environment <br />The depository site is located in a remote mining area south of Denver, Colorado (see <br />Figures 1 and 2). Denver urban communities (south Littleton) aze some 10 miles north <br />of the project site and aze the closest sizeable populated community to the project. The <br />community of Sedalia (unincorporated) is approximately one-half mile to the south. It <br />is estimated that no more than 10 residences exist in aone-half mile radius of the project <br />site. All of these residences aze located to the west and aze upwind of the proposed site. <br />Only one residence is located within sight of the proposed project. Because of its <br />• remote location, the depository site is isolated from the public for aesthetic purposes. <br />The geological conditions at the depository site aze considered ideal for a compliance <br />depository. The fill will be encased in a compliance liner system that will be <br />recompacted clay or, if necessary, GCL. A number of substantial (> 20 feet thick) <br />impermeable claystone units aze present in the geologic sequence underlying the fill <br />azea. The uppermost saturated zone is some 60 to 100 feet below the proposed base <br />of waste placement. The site geology, to a depth of 260 feet below the ground <br />surface, is shown in the generalized geologic cross sections of Figure 4. The <br />lithologic descriptions, including that fora 2,084-foot deep water well at the site, aze <br />presented in Appendix 1. <br />• <br />IAO/1191lt 1915tW1iWvmiil0o0.dx Sedalia Recycling Center and Depository <br />