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17 <br /> 3.2 DESIGN RDFS <br /> 3.2.1 Geologic Data <br /> The site, as previously stated, does not lie within a floodplain. The <br /> South Platte River does lie a little over one mile northwest of the site, but <br /> the landfill site itself sits in a different geologic area than the South <br /> Platte River Valley. This site is in a area known as the breaks, lying <br /> between the tableland to the south side of Sedgwick Cbnmty and the river <br /> terrace of the South Platte River. Approximately 63,000 acres or 18% of the <br /> entirety of Sedgwick City makes up the geologic area la'own as the breaks. <br /> A vast majority of that entire acreage is utilized as grazing land. Very <br /> little cropland occurs there. While ranchers do live in the breaks area, <br /> they are few and far between and relatively isolated. The "breaks" area does <br /> provide isolation from the public at large, thus meeting ore of the major <br /> criteria set forth in the selection process. <br /> The county has operated several different borrow pits in the breaks <br /> area, as there are isolated pockets of usable road material. In each of <br /> those operations, they have encountered almost an impermeable clay anywhere <br /> from 20 to 40 feet in depth. This naturally occurring clay soil, as shown by <br /> the soils tests accompanying this analysis will provide an adequate lining at <br /> the very bottom of the trenches where landfill material will be buried. <br /> Groundwater, according to the well logs which have been obtained, is <br /> fairly deep in the area of the landfill site. A copy of surrounding logs is <br /> attached. The well logs within adjoining quarters show that groundwater <br /> depth is at least 150 feet deep. Ranchers have had trouble finding a well <br /> with adequate water when drilling for stock wells on the site. The great <br /> distance to groundwater also provides an additional safeguard for the <br /> landfill site. <br /> The well log table also shows soire very shallow wells. Those wells all <br /> lie north of the landfill site and are actually tapping the South Platte <br /> River Valley aquifer. The locations farther to the south of the circle on <br /> the nap get deeper and deeper. These wells are all out of the Ogallala <br /> aquifer which is a nuch deeper water source. <br /> Surface run-off will be maintained on the site during the course of <br /> operation of the landfill. <br />