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Map Unit Description:Ustorthents,frigid-Borolls complex,25 to 75 percent slopes—Moffat Fedinec Pit County Area,Colorado Moffat County Area, Colorado 206—Ustorthents, frigid-Borolls complex, 25 to 75 percent slopes Map Unit Setting National map unit symbol. jpby Elevation: 7,000 to 8,500 feet Mean annual precipitation: 16 to 20 inches Mean annual air temperature: 37 to 45 degrees F Frost-free period. 50 to 85 days Farmland classification: Not prime farmland Map Unit Composition Ustorthents, frigid, and similar soils: 55 percent Borolls and similar soils: 35 percent Minor components: 10 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Ustorthents, Frigid Setting Landform: Mountainsides Landform position (two-dimensional): Footslope, backslope Landform position (three-dimensional): Mountainflank Down-slope shape: Linear Across-slope shape: Linear Parent material: Residuum and colluvium derived from sedimentary rocks Typical profile H1 -0 to 3 inches: very channery sandy loam H2-3 to 28 inches: extremely channery sandy loam H3-28 to 32 inches. unweathered bedrock Properties and qualities Slope: 25 to 75 percent Depth to restrictive feature: 10 to 30 inches to paralithic bedrock; 10 to 30 inches to lithic bedrock Natural drainage class. Well drained Runoff class: Very high Capacity of the most limiting layer to transmit water(Ksat): Moderately low to moderately high (0.06 to 0.20 in/hr) Depth to water table: More than 80 inches Frequency of flooding. None Frequency of ponding: None Calcium carbonate, maximum in profile: 10 percent Available water storage in profile: Very low(about 2.5 inches) Interpretive groups Land capability classification (irrigated): None specified USDA Natural Resources Web Soil Survey 12/27/2016 Conservation Service National Cooperative Soil Survey Page 1 of 3