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• Conservation Service procedures (SCS, 1972). Two sets of samples <br />were collected. In one set, the pedon was sampled by major soil <br />horizon to a depth of 60 inches or to bedrock, whichever was <br />shallower. In the other set, composite samples were collected by <br />six-inch depth intervals (0 to 6, 6 to 12, 12 to 18, etc.) by means <br />of a manually operated soil core. These samples were taken as <br />deeply as the soil stoniness would permit the core's use. <br />Samples were placed in clean polyethylene bags and labeled. All <br />samples were air-dried soon after sampling. Each sample was sent <br />to the Soils Testing Laboratory, Colorado State University, Fort <br />Collins, Colorado. Samples were analyzed for those parameters <br />required by the MLRD. <br />3.5.2 Soil Survev and Mapping Results <br />• The area where the surface facilities are to be located has been <br />disturbed by earlier mining activity and exhibits signs of over- <br />grazing. This area has a generally north aspect and ranges from <br />gently to moderately sloping. Two soil types were identified here. <br />These are the Heldt silty clay, 3 to 12 percent slopes and Nihill <br />stony loam, 6 to 25 percent slopes. The location of these mapping <br />units are exhibited in Figures 3.5-1 and 3.5-2. <br />Heldt silty clay. 3 to 12 percent slopes. This deep, well-drained, <br />gently to moderately sloping soil occurs on alluvial fans and the <br />side slopes of valleys. The soil is formed in fine textured <br />alluvium derived from shale and sandstone. Included in this <br />mapping unit are soils with mollic surface horizons and other <br />surface phase (sicl, cl, c). The technical classification of this <br />soil is a fine, montmorillonitic, mesic Usteric Camborthid. <br />Typically, the surface layer is grayish-brown silty clay about five <br />• inches thick, the subsoil is light brownish-gray clay loam about 10 <br />NCEC - Coal Ridge #1 3-55 ABC/1145/900301 <br />