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precipitation ranges from 16 to 18 inches, the average annual soil temperature is 43°F to <br />45°F, the mean summer temperature is 56°F to 59°F, and the frost-free season is 75 to 90 <br />days. <br />Included with this soil in mapping are a few small areas of sandstone and shale outcrops, <br />shallow soils over sandstone, and small areas of work soils. <br />The duff layer is decomposed and undecomposed leaves, twigs, and grass. Typically the <br />surface layer is a dark grayish brown loam about 20 inches thick. The subsoil is a light <br />yellowish brown clay loam about 2~ inches thick. The substratum is a light yellowish brown <br />clay loam to a depth of 60 inches. <br />Permeability is moderate. The available water capacity is high. Effective rooting depth is 60 <br />inches or more. Surface runoff is rapid, and the erosion hazard is moderate from wind and <br />high from water. <br />Most of this mapping unit is native range and used for grazing. Present and potential <br />productivity of this soil is good. <br />17D -Work Loam. 3 to 12 Percent Slopes <br />This is a deep, well drained soil that is found throughout the permit area. The soil is very <br />useful for reclamation purposes, and its usefulness is limited only by its clay content. Mixing <br />of this soil may prove beneficial, as the heavy, textured horizons will be mixed with lighter <br />textured horizons. The soil developed in interbedded sandstone and shale and is on upland <br />benches and sideslopes. The average annual precipitation ranges from 16 to 18 inches, the <br />average annual soil temperature is 43°F to 46°F, and -the frost-free season is 75 to 95 days. <br />Included with this soil in mapping are a few small areas of Regent, Bumette, and Campspass <br />soils. <br />Typically the surface layer is a grayish brown loam about 7,iaches thick. The upper subsoil is <br />a brown heavy clay loam about 22 inches thick. The lower subsoil is a yellowish brown clay <br />loam about 30 inches thick. It is calcareous below about 47 inches. <br />Permeability is moderate. The available water capacity is high. Effective rooting depth is 60 <br />inches or more. Surface runoffs slow, and the erosion hazard is moderate from wind and <br />water. <br />Most of this mapping unit is native range and used for grazing. Present and potential <br />productivity of this soil is good. <br /> <br />2.04.9-4 <br />