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Custom Soil Resource Report <br /> Georgetown Area, Colorado, Parts of Clear Creek, Gilpin, and Park <br /> Counties <br /> 27—Lone Rock-Breece gravelly sandy loams, 2 to 9 percent slopes <br /> Map Unit Setting <br /> National map unit symbol: k6hp <br /> Elevation: 7,700 to 8,500 feet <br /> Mean annual precipitation: 16 to 22 inches <br /> Mean annual air temperature: 36 to 45 degrees F <br /> Frost-free period: 25 to 100 days <br /> Farmland classification: Farmland of statewide importance <br /> Map Unit Composition <br /> Lone rock and similar soils: 55 percent <br /> Breece and similar soils: 35 percent <br /> Minor components: 10 percent <br /> Estimates are based on observations, descriptions, and transects of the mapunit. <br /> Description of Lone Rock <br /> Setting <br /> Landform: Alluvial fans, terraces <br /> Down-slope shape: Concave, linear <br /> Across-slope shape: Linear <br /> Parent material: Alluvium derived from igneous and metamorphic rock <br /> Typical profile <br /> A -0 to 9 inches: gravelly sandy loam <br /> AC-9 to 13 inches: very gravelly loamy sand <br /> C1 - 13 to 28 inches: very gravelly loamy sand <br /> C2-28 to 60 inches: extremely gravelly sand <br /> Properties and qualities <br /> Slope: 2 to 9 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 /> in/hr) <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 2.4 inches) <br /> Interpretive groups <br /> Land capability classification (irrigated): None specified <br /> Land capability classification (nonirrigated): 4s <br /> Hydrologic Soil Group: A <br /> Ecological site: Mountain Loam (R048AY228CO) <br /> Hydric soil rating: No <br /> 14 <br />