2001-12-11_PERMIT FILE - C1980005

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Map Unit No. X8 Splitro-Winevada Looms and Sandy Looms b to 40+ l opes. percent s These moderately to steeply sloping, well-drained soils are on rolling uplands and hills. Slopes are smooth to broken. The native vegetation is mainly Gambell, oak, sagebrush, grasses and fortis. Elevation is 6800 to 7800 feet. The average annual air temperature is 38 to 43 degress F., and the average frost-free period is 70 to 90 days. Soil temperatures are in the cryic soil zone. Individual areas of this unitareonbroader slopes and range from a few to many acres in size. Typically the grayish brown (lOYR 5/2) to very dark grayish brown (10YR 3/2 moist) loam surface layer is about 12 inches thick but ranges from 10 to 20 inches thick. The subsoil may be absent and the dark soil rest directly on bedrock. In other places stony sandy looms to clay looms may underlie the dark topsoil. These soils are underlain by sandstone at depths of 8 to 40 inches. Electrical conductivity is low as are the Sodium absorption rations. The soils are slightly acid 6.0 to 6.3 pH. Included with this soil in mapping are areas of rock outcrop and very stony soils along slope breaks and ridges. Water and air move through this soil at a moderately rapid rate and surface runoff is moderate to slight. Root development may be restricted below a depth of about 8-30 inches by sandstone bedrock and large channers, although deeper penetrations by some brush species through cracks and fissures occur. This unit is not a good source for topsoil because of high proportion of stones. Quality of topsoil fines are good but usability is reduced by the presence of bedrock at shallow depths and numerous stones and channers in the profile. Quantity of strippable fair-to-good quality topsoil may be limited to an average depth of 6-12 inches and careful manipulation of machinery will be necessary to avoid excess stones in stockpiles. Topsoil salvage operations are Beverly limited by the stones and bedrock. -24-