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2.04.6 Geology Description <br />A sample was obtained from TP -3 at a depth of 0 to 1.5 feet ( "G" in the <br />spread sheet in Exhibit 6). The material was classified as a sandy loam. <br />Acid base potential was not run on this sample. However, the 0.09% <br />pryritic sulfur content, an indicator of acid forming potential, is quite low. <br />This sample is representative of the of the evaporation ponds /land <br />treatment areas. <br />The land treatment area, evaporation ponds 4 & 5, shown on Map 19 <br />contain about 18 inches of processed material. By letter dated August 25, <br />2003, the Colorado Department of Public Health & Environment (CDPHE) <br />issued a final closure certification for the land treatment areas. By letter <br />dated July 28, 2005, CDPHE, confirmed the final closure certification. The <br />letter states there are no known conditions on the property that would <br />prompt the Division to request Western Slope Refining to conduct any <br />investigation and /or remediation of the property. The closure certification <br />is for residential /unrestricted use. The correspondence relating to the <br />closure certification is presented in Volume I, Exhibit 15. The applicant <br />had some grab samples analyzed to confirm the information contained in <br />the closure certification. The Applicant believes its grab sample laboratory <br />results were comparable to the laboratory results used to obtain the <br />closure certification. Materials may be encountered that are deemed <br />unsuitable for construction and if so will be excavated and placed in pond <br />6 and covered with two feet of "clean" dirt. These unsuitable materials <br />may include buried coke fines and processed material located in the <br />evaporation ponds. <br />No significant geohazards exist at the loadout area. Reed Wash and <br />Loma Drain are both deeply incised so flood hazards are low. <br />Soil material derived from the Mancos Shale and the Mesaverde Group <br />contain clays that on wetting can swell or collapse causing damage to <br />structures. Structure design will account for clay soils. <br />Permit Application 2.04 -12 04/11 <br />