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.~- <br />r. <br />• • <br />` 12/92 <br />21--Bulkley stony loae~ 15 to 30 paresnt slopes, very <br />stony. This very deep, well drained soil is on hillslopes. <br />It formed in colluvium derived from shale. Elevation is <br />6,700 to 7,200 feet. The average annual precipitation is 13__ <br />to 15 inches, the average annual air temperature is 42 to 45 <br />degrees F., and the average frost-free period is 75 to 95 <br />days. <br />Typically, the surface is covered with 1 to 3 percent <br /> <br />stones. The surface layer is brown stony loam 2 inches <br />thick. The upper 31 inches of the subsoil is yellowish <br />brown clay. The lower part to a depth of GO inches or more <br />i5 brownish yellow calcareous clay loam. <br />Included in this unit are soils that are extremely <br />stony throughout occurring on the shoulders of hills, and <br />soils similar to lsulkley but with bedrock at a depth of 2U <br />to 40 incF,es occurring on all positions on the hillsides. <br />Permeability of this C.ulkley soil is slow. Available <br />water capacity is high. Effective routing depth is 40 <br />inches or more. Runoff is rapid, and the hazard of water <br />erosion is high. The hazard of soil blowing is slight. <br />EXHIBIT ~-3 <br />