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• proper engineering designs and by backfilling with material that has low <br />shrink-swell potential. <br />This map unit is in capability subclass VIe. The Aaberg soil is in the <br />Deep Clay Loam range site. The Waybe soil is in the Mountain Shale range <br />site. <br />S--Buckskin silty clay loam, 3 to 12 percent slopes. This mapping unit <br />consists of deep, moderately well drained, gently to strongly sloping soils <br />forming on high terraces. These soils are forming in moderately fine textured <br />alluvium and colluvium derived from mixed sources. They occur along Fish <br />Creek. <br />The mapping unit is composed of approximately 90 percent Buckskin soils. <br />Included in the mapping unit are approximately 5 percent Bozeman Series and <br />5 percent Pachic Cryoborolls. <br />• Typically the Buckskin soils have a grayish brown silty clay loam surface <br />layer 3 inches thick, a very dark grayish brown and brown clay argillic <br />subsoil 16 inches thick, a light olive brown clay loam and loam substratum <br />20 inches thick, and a mottled light gray silt loam substratum 21 inches <br />thick. <br />Permeability is slow, and the available water capacity is high. <br />Effective rooting depth is 60 or more inches. Surface runoff is medium to <br />rapid. <br />5A--Absher fine sandy loam, 1 to 6 percent slopes. This is a deep, well <br />drained sail in nearly level to moderately sloping alluvial valley floors at <br />elevations of 6,300 to 7,000 feet. It formed in alluvium derived from shale. <br />The average annual precipitation is 15 to 11 inches, the average annual air <br />temperature is 41 to 43 degrees F, and the frost-free season is 75 to 95 days. <br />Small areas of a soil similar to Absher but having a water table at a <br />depth of 40 to 60 inches, are included in mapping. Also included in mapping <br />• are small areas of Bulk ley silty clay loam. <br />Ex. 16-13 <br />