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Section 779.21 (a )Continued. <br />• (1964) provided valuable insight on the morphology and genesis of <br />the chestnut and Lithosol Soil Groups encountered in northwestern <br />Colorado. The Soil Survey Staff (1975) states that according to <br />the Seventh Approximation, the soils in the permit area belong to <br />the Aridic subgroup of Ustolls. <br />On a more localized basis, Heil, et. al. (1977), report that the <br />soils encountered on the permit area belong to the Argis Cryo- <br />borolls - Cryic Paleborolls and Typic Paleborolls Soil Associaitons. <br />General non-site specific descriptions of these respective Mapping <br />Units as described in Exhibit 18, Soil Profile Descriptions and in <br />Exhibit 19, Mapping Units, are as follows: <br />Typis Paleborolls--Borollic Camborthids: clayey; gently sloping to <br />moderately steep. This map unit is in the northwestern part of the <br />state in south central Routt County. The soils in this unit <br />dominantly occupy uplands. They formed in materials weathered in <br />• place from soft shale. Slopes are gently sloping to moderately <br />steep. Elevations range from 7,000 to 5,000 feet. Slopes range <br />from 2 to 30 percent. The average annual precipition ranges <br />from 16 to 20 inches. The mean soil temperature is about 45 to 47 <br />degrees F., and the frost-free season is approximately 80 to 100 <br />days. <br />Typic Paleborolls make up about 40 percent of this map unit, and <br />Borollic Camborthids about 40 percent. The remaining 20 percent is <br />composed of similar soils which are less than 20 inches to bedrock <br />and soils which have loamy textures. <br />The specific descriptions of Typic Paleborolls--Borollic Camborthids <br />are described in Exhibit 18, Soil Profile Descriptions, and <br />Exhibit 19, Mapping Units. <br />• <br />779-249 <br />