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Page 2 <br />' BASELINE INFORMATION <br />For geology, soils, hydrology, seismicity and climatological baseline <br />information, please refer to the attached report titled "Prelimimary <br />' Geotechnical Investigation" by Cooper 6 Clark Consulting Engineers, <br />dated December 15, 1981 (See Appendix A). <br />SOIL RESOURCE INFORMATION (AGRICULTURAL) <br />Western Slope Carbon's coal waste disposal site is located within Soil <br />Mapping Units 23 and 16 of the Soil Conservation Service's National <br />Cooperative Soil Survey of the Paonia Area, Colorado. Unit 23, Chipeta <br />' silty clay, 3 to 30 percent slopes, is a shallow, "well drained" soil <br />that overlies Mancos shale at a depth of 10 to 20 inches. Unit 16, Billings <br />' silty clay loam, 0 to 6 percent slopes, is a deep "well drained" soil. <br />The Chipeta silty clay was formed by in-place weathering of the Mancos <br />shales. The surface layer of soil is light brownish gray (2.5 Y6/2) <br />silty clay approximately four inches thick. The underlying material is <br />' light brownish gray (2.5 Y4/2), moderately alkaline silty clay. <br />' Permeability is slow and available water capacity is low. Effective rooting <br />depth is approximately 15 inches. Surface runoff is medium to rapid. The <br />' hazard of erosion from wind is slight and from water is high. <br />' The elevation at the disposal site is 5480 feet. Average annual pre- <br />cipitation is approximately nine inches, average annual temperature is <br />approximately 50 degrees F., and the average frost-free season is approxi- <br />' mately 145 days. <br />' Chipeta soils are similar to, and often found in association with Persayo <br />and Killpack soils. Persayo and Killpack soils are clay loams with a silty <br />' calcareous shale at a depth of 10 to 20 inches. Chipeta soils are also <br />found in association with Billings soils. <br />The following is a typical pedon representing Chipeta silty clay, 3 to 30 <br />