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<br /> <br />032181 tt <br />regime is usUc where rainfall occurs during early <br />< <br /> <br />. <br />spring and late summer <br /> <br />months, Average annual soil temperature is more than 470F. but less than <br /> <br />590F, mesic; frost-free season is 100-140 days, <br /> <br />The association has about 60 percent Lithi~ Ustic Torriorthents and <br /> <br />40 percent rock outcrop, These soils and land type are located along the <br /> <br />Utah State line'west of, Rangely in Rio Blanco County and in the northwest <br /> <br />part of Moffat County. <br /> <br />Lithic Ustic Torriorthents are shallow, well-drained soils on sedimen- <br /> <br />tary rocks. Typically they have a light-colored, loamy surface layer, <br /> <br />Al horizon, less than 7 inches thick, The substratum, 7-20 inch layer, <br /> <br />C horizon, is a light-colored, loamy material overlying fractured bedrock, <br /> <br />Permeability is moderate; effective rooting depth is less than 20 inches. <br /> <br />Available water capacity is low-very low; surface runoff is rapid and <br /> <br />erosion hazard is high. Rock outcrop consists of exposures of bare rock. <br /> <br />The sediment yield from this association is 0.5-3,0 acre-feet/square <br /> <br />mile/year. These soils are used mainly for wildlife, range, and woodland, <br /> <br />General vegetative type is pinyon-juniper. Reclamation potential is poor <br /> <br />due to excess slope, rock outcrop and semi-droughtiness. <br /> <br />Ustic Torripsamments Association, Association #45, (50,226 acres) <br /> <br />Ii <br />'1 <br />I! <br />; i <br /> <br />This association consists of gently-sloping to moderately-steep soils <br /> <br />on uplands (3-25 percent slopes). Elevation ranges frow 6,000-6,500 feet, <br /> <br />Average precipitation is 12-15 inches; soil moisture regime is torric <br /> <br />bordering on ustic where rainfall occurs during early spring and late <br /> <br />swnmer months. Average annual soil temperature is less than 470F, and the <br /> <br />difference between summer and winter temperature is more than gOF, frigid; <br />, <br /> <br />frost-free season is 100-120 days. <br /> <br />13 <br />