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inches thick and the substratum is light gray clay to a depth of 60 <br />inches. Permeability is slow and available water capacity is • <br />moderate. Surface runoff is medium and the erosion hazard'is <br />moderate. The dominant native vegetation is sagebrush and some of <br />the land supports irrigated hay. <br />The typical profile is described below: <br />Al 0 to 5 inches, grayish-brown silty clay; moderate <br />medium granular structure; hard, firm, sticky and <br />plastic; mildly alkaline; clear, smooth boundary. <br />B2 5 to 15 inches, light, light brownish-gray heavy <br />clay loam; weak medium prismatic structure parting <br />to moderate medium subangular blocky; very hard, <br />very firm, very sticky, very plastic; calcareous; <br />moderately alkaline; clear smooth boundary. <br />Clca 15 to 40 inches, light gray clay; massive; very <br />hard, very firm, very sticky, and very plastic; • <br />calcium carbonate accumulations as lime concretions <br />and seams; calcareous; moderately alkaline; clear, <br />smooth boundary. <br />C2ca 90 to 60 inches, light gray clay; massive; very <br />hard, very firm, very sticky, very plastic; cal- <br />careous; moderately alkaline. <br />Nihillstonv loam, 6 to 25 percent slopes. This deep, well-drained, <br />moderately sloping to hilly soil is located on alluvial fans and on <br />the sides of valleys. It forms in the alluvium derived from Green <br />River shale and sandstone. Included in this mapping unit are some <br />non-skeletal soil and some soils with lesser and greater sloped. <br />The classification of this soil is loamy-skeletal, mixed, mesic <br />Ustic Torriorthent. <br />Typically, the surface layer is light gray and very pale brown <br />NCEC - Coal Ridge #1 3-56 ABC/1145/900301 <br />