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92F. Argic Pachic Cryoborolls-Cryobo rolls complex, 25 to 65 percent <br />• slopes. These soils are steep to very steep soils on mountain <br />sideslopes at elevations of 7,800 to. 9,000 feet. The two components <br />of this unit are fine, montmorillonitic, Argic Pachic Cryoborolls, 60 <br />percent, and fine-loamy, mixed, Boralfic Cryoborolls, 25 percent. <br />These soils occur on the north facing portion of the ridge along the <br />vent pipe road corridor. Included in this unit are about 15 percent <br />soils that lack a thickened dark surface layer and soils that lack a <br />thick highly leached surface layer. <br />Both soils are deep and formed in colluvium and residuum from inter- <br />bedded sandstone and shales. Typically, the Argic Pachic Cryoborolls <br />have a surface layer that is very dark brown loam about 20 inches <br />thick. The subsoil is brown gravelly clay aobut 16 inches thick. The <br />substratum, to a depth of 60 inches or more, is brown gravelly clay <br />loam. <br />Permeability of this soil is slow. Effective rooting depth is more <br />• than 60 inches. Available water capacity is 0.14 to 0.16 in.{in. <br />Surface runoff is high and the erosion hazard is high. Topsoil suita- <br />bility is poor due to steep slopes. <br />The Boralfic Cryoborolls typically have a surface layer that is very <br />dark grayish brown loam about 10 inches thick. The subsurface layer <br />is brown loam about 6 inches thick. The subsoil is dark grayish brown <br />clay loam about 24 ihches thick. The substratum is brown clay loam <br />that extends below 60 inches. <br />Permeability of this soil is moderate. Effective rooting depth is <br />greater than 60 inches. Available water capacity is 0.16 to 0.20 <br />in./in. Surface runoff is high and the erosion hazard is high. <br />Topsoil suitability is poor due to steep slopes, <br />• <br />3-107 <br />