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I • The map units within the South Taylor/ Lower Wilson permit expansion azea that are located in Rio Blanco County (Tripp et al., 1982) are as follows: Publication Maa Symbol Maonina Unit Name 57 Owen Creek-Jerry-Bumette loams, S-3S% slopes 77 Rhone-Northwater-Lamphier loams, 3-SO% slopes 84 Silas Variant loam, 1-3% slopes 91 Tomorthents-Rock outcrop complex, 15-90% slopes 98 Waybe-Vandamore Vaziant-Rock outcrop complex, 5-30% slopes The narrative descriptions of the soil map units found within the STLW Permit Area are provided below. NRCS Soils Map Unit Descriptions -Moffat County 3 - Adderton loam, 1-10% slopes This very deep, well drained soil is in drainageways and on allu gal fans. ]t formed in alluvium derived from sedimentary rocks. Elevation is 7,000 to 8,S 0 feet. The average annual precipitation is 16 to 20 inches, the average annual air temperatur, is 37 to 40 degrees F., and the average frost-free period is SO to 75 days. ~ • Typically the surface layer is very dark grayish brown loam 22 inches thick, The upper 17 inches of the underlying material is dark grayish brown loam. The lower part to a depth of 60 inches or more is brown fine sandy loam. Included in this unit are soils which are effervescent at a depth of 2S inches. Also included are moderately well drained and somewhat poorly drained soils occurring in lower lying areas and adjacent to streams. Permeability of this Adderton soil is moderate. Available water holding capacity is high. Effective rooting depth is 60 inches or more. Runoff is medium, and the hazard of water erosion is moderate. The hazard of soil blowing is slight. The hazard of flooding is rare. This unit is used for non-irrigated hay, livestock grazing and wildlife habitat. 10 -Battlement fine sandy loam, 0-3% slopes This very deep, well drained and moderately well drained soil is on floodplains and stream terraces. It formed in alluvium. Elevation is 6,000 to 6,800 feet. The average annual precipitation is 11 to 15 inches, the average annual air temperature is 42 to 45 degrees F., and the average frost-free period is 75 to 90 days. Typically, the surface layer is dark grayish brown calcareous fine sandy loam 3 inches thick. The underlying material to a depth of 60 inches or more is stratified pale brown, grayish brown, and light brownish gray calcazeous fine sandy loam, loam, silt loam, and silty clay loam. • Included in this unit are small areas of Cowestgien soils and Battlement, saline soils. Revision Date: Revision No.: