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October 2000 -22- 003-2191 <br />• 3.1.9 Waste in Surface or Groundwater <br />Waste will not be placed in surface or groundwater. As explained above, the nearest <br />potential groundwater is approximately 60 to 100 feet below the lowest elevation of the <br />any planned cell. There is no surface water impounded on the waste at the depository <br />site. Run-off from azeas upgradient of the depository will also be so minimal and will <br />be controlled by either diversion ditches or permanent retention structures. <br />3.2 DESIGN REQUIREMENTS <br />3.2.1 Geologic Data <br />General Description <br />The Sedalia Project lies on the western flank of the Denver Basin in an area of slight to <br />• moderate surface topography in hill and gully surface features. The north-south axis of <br />the synclinal Denver Basin is to the east of the site. The Denver Basin is a substantial <br />asymmetrical synclinal basin geographically extending from the mountains west of <br />Denver to the east neaz Limon and north from Weld County to the south of Colorado <br />Springs. It is some 150 miles along the north-south axis and approximately 100 miles <br />along the east-west axis. Exposed Cretaceous and Tertiary rocks are present aoound the <br />project region. The Dawson and Denver formations aze present in outcrops around the <br />site. <br />The Dawson azkose consists of conglomerate, sandstone, and claystone, and contains a <br />tongue of the Denver formation. The thickness is thought to be more than 1,000 feet in <br />the vicinity of the project site. The lower beds aze some 500 feet thick and aze of Late <br />Cretaceous age and the upper beds aze of Paleocene age. Beginning with the Fox Hills, <br />which is at the base of the strata identified by property drilling, the formations are <br />described by Scott (1962) in ascending order in the following sections. <br />VOORI91RI91Sda1~Wmn~~1000 dac Sedalia Recycling Center and Depository <br />