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• 7 • <br />EJs:HIBIT B (1) <br />202-Clapper-Torriorthents complex, 5 to 40 percent slopes. This map unit is on high terraces <br />and mesas. The native vegetation is mainly grasses, pinyon pine and Utah juniper. Elevation is <br />5,_00 to 6,800 feet. The average annual precipitation is 12 to 14 inches, the average annual air <br />temperature is 46 to 48 degrees F. and the average frost-free period is 110 to 130 days. <br />This unit is 35 percent Clapper loam and 35 percent Torriorthents. Substratum soils, 5 percent <br />Bon soils, 5 percent Harvey soils, 5 percent Progresso soils, and 5 percent Vananda soils. <br />The Clapper soil is deep and well drained. It formed in cobbly alluvium derived dominately <br />from igneous rock. Typically, the surface layer is brown loam about 5 inches thick. The <br />subsurface layer is pink loam about 6 inches thick. The upper 9 inches of the underlying <br />material is white cobbly loam. The lower part to a depth of 60 inches is pinkish white very <br />cobbly loam. In some azeas the surface layer is gravelly loam. <br />Permeability of the Clapper soil is moderate. Available water capacity is moderate. Effective <br />rooting depth is 60 inches or more. Runoff is medium to very rapid, and the hazazd of water <br />erosion is moderate to very high. <br />Torriorthents are highly variable and little or no soil development has occurred. Torriorthents <br />aze; moderately deep and deep and generally lack a calcic horizon. Texture is loam, clay loam, <br />or sandy clay loam, and clay content is generally 15 to 30 percent. Some azeas are shallow to <br />shale or sandstone. <br />