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Custom Soil Resource Report <br />Ouray Area, Colorado, Parts of Gunnison, Hinsdale, Ouray, San Juan, and <br />San Miguel Counties <br />104 — Borolls -Rock outcrop complex, 40 to 90 percent slopes <br />Map Unit Setting <br />Elevation: 8,800 to 11,200 feet <br />Mean annual precipitation: 25 to 34 inches <br />Mean annual air temperature: 32 to 41 degrees F <br />Frost -free period: 45 to 70 days <br />Map Unit Composition <br />Borolls and similar soils: 60 percent <br />Rock outcrop: 20 percent <br />Description of Borolls <br />Setting <br />Landform: Mountain slopes <br />Landform position (two- dimensional): Backslope <br />Landform position (three- dimensional): Mountainflank <br />Down -slope shape: Convex <br />Across -slope shape: Linear <br />Parent material. Colluvium derived from mixed and /or slope alluvium derived from <br />mixed <br />Properties and qualities <br />Slope: 40 to 90 percent <br />Depth to restrictive feature: 10 to 91 inches to paralithic bedrock <br />Drainage class: Well drained <br />Capacity of the most limiting layer to transmit water (Ksat): Very low to moderately <br />low (0.00 to 0.06 in /hr) <br />Depth to water table: More than 80 inches <br />Frequency of flooding. None <br />Frequency of ponding: None <br />Available water capacity. Very low (about 1.4 inches) <br />Interpretive groups <br />Land capability (nonirrigated): 8e <br />Typical profile <br />0 to 8 inches: Very gravelly sandy loam <br />8 to 19 inches: Very gravelly loam <br />19 to 23 inches: Weathered bedrock <br />Description of Rock Outcrop <br />Setting <br />Landform: Mountain slopes <br />Down -slope shape: Linear <br />Across -slope shape: Linear <br />Properties and qualities <br />Slope: 40 to 90 percent <br />Depth to restrictive feature: 0 inches to lithic bedrock <br />12 <br />