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Georgetown Area, Colorado, Parts of Clear Creek, Gilpin, and Park <br /> Counties <br /> 1—Arents-Dumps, mine complex, 5 to 80 percent slopes <br /> Map Unit Setting <br /> National map unit symbol: k07c <br /> Elevation: 7,400 to 9,000 feet <br /> Mean annual precipitation: 16 to 20 inches <br /> Mean annual air temperature: 37 to 45 degrees F <br /> Frost-free period. 40 to 100 days <br /> Farmland classification: Not prime farmland <br /> Map Unit Composition <br /> Arents and similar soils: 45 percent <br /> Dumps, mine: 35 percent <br /> Minor components: 20 percent <br /> Estimates are based on observations, descriptions, and transects of the mapunit. <br /> Description of Arents <br /> Setting <br /> Landform: Mountain slopes <br /> Landform position (two-dimensional): Footslope,toeslope <br /> Down-slope shape: Linear <br /> Across-slope shape: Linear <br /> Parent material: Mine spoil or earthy fill <br /> Typical profile <br /> C1 -0 to 24 inches: very cobbly loamy coarse sand <br /> C2-24 to 28 inches: gravelly sandy loam <br /> C3-28 to 33 inches: extremely cobbly loamy sand <br /> C4-33 to 60 inches. extremely cobbly loamy sand <br /> Properties and qualities <br /> Slope: 5 to 80 percent <br /> Percent of area covered with surface fragments: 2.0 percent <br /> Depth to restrictive feature: More than 80 inches <br /> Natural drainage class: Somewhat excessively drained <br /> Runoff class: Low <br /> Capacity of the most limiting layer to transmit water(Ksat): High (2.00 to 6.00 <br /> inlhr) <br /> Depth to water table: More than 80 inches <br /> Frequency of flooding: None <br /> Frequency of ponding: None <br /> Available water storage in profile: Very low(about 2.0 inches) <br /> Interpretive groups <br /> Land capability classification(irrigated): None specified <br /> Land capability classification(nonirrigated): 7e <br /> Hydrologic Soil Group: A <br /> Hydfic soil rating: No <br /> 24 <br />