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• SOILS INFORMATION • • • General- Rio Blanco County has not been mapped by the Soil Conservation Service. They are, however, in the process of mapping but it is not scheduled to be complete until 1985. Overburden Soils in the affected Area are of the x-62 Calciorthids - Tridell Complex and are discussed below. X62--Calciorthids-Tridell complex, 6 to 50 percent slopes These moderately sloping to steep soils are on upland and terrace breaks along the White River drainage in the central part of the survey area. They occur at elevations between about 5,800 to 6,900 feet. The average annual precipitation is about 16 inches, and the mean annual air temperature is about 46 degrees F. The Calciorthid soils make up about 55 percent of the mapping unit, and the Tridell soil about 35 percent. These Calciorthid soils are similar to the Tridell soil but differ mainly by having a larger volume of coarse gravel and cobble on the surface and throughout. They also are • shallow to contrasting and/or highly calcareous subsoils. About 10 percent of the unit is inclusions of Work loam, and Zoltay gravelly • clay loam on 3 to 8 percent slopes. The Calciorthid soils are deep, well drained, gravelly and cobbly soils throughout. They formed in calcareous alluvium and colluvium from mixed parent material of old glacial outwash. They generally occur on slopes greater than 10 percent. • Typically the surface layer is grayish brown mildly to moderately alkaline, gravelly and/or cobbly loams, clay loamy, or sandy loams about 2 to 5 inches thick. The underlying material is moderately to • strongly alkaline pale or light brown highly calcareous very gravelly and cobbly loamy, sandy loams, or loamy sands to depths of 30 inches or more. Permeability is moderate or moderately slow. The effective • rooting depth is 20 inches or more, and the available water capacity is low to moderate. Surface runoff is rapid to medium, and the erosion • hazard is moderate. •