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Map Unit Description <br />San Miguel Area, Colorado, Pads of Dolores, Montrose, and San Miguel Counties <br />78 Pinon-Ustic Torriorthents complex, 5 to 30 percent slopes <br />Setting <br />Elevation: 5400 to 6800 feet <br />Mean annual precipitation: 12 to 14 inches <br />Mean annual air temperature: 46 to 48 degrees F <br />Frost-free period: 110 to 130 days <br />Composition <br />Pinon and similar soils: 50 percent <br />Ustic tordorthenls and similar soils: 35 percent <br />Description of Pinon <br />Setting <br />Landform: Hills, ddges <br />Down-slope shape: Linear <br />Across-slope shape: Linear <br />Parent material: Residuum weathered from sandstone and shale <br />Properties and Qualities <br />Slope: 5 to 30 percent <br />Depth to restdctive feature: 10 to 20 inches to Lithic bedrock <br />Drainage class: Well drained <br />Capacity of the most limiting layer to transmit water (Ksat): Moderately low or moderately high (0.06 to 0.20 in/hr) <br />Frequency of Flooding: None <br />Frequency of ponding: None <br />Calcium carbonate maximum: 40 percent <br />Gypsum maximum: 0 percent <br />Available water capacity: Very low (about 2.0 inches) <br />Interpretive Groups <br />Land capability (rwn irdgated): 7s <br />Other vegetative classification: Pinyon-Juniper (null_10) <br />Typical Profile <br />0 to 5 inches: loam <br />5 to 16 inches'. gravelly loam <br />16 to 20 inches: unweathered bedrock <br />Description of Ustic torriorthents <br />Setting <br />Landform: Hills, ddges <br />Down-slope shape: Linear <br />Across-slope shape: Linear <br />Parent matedal: Colluvium and residuum derived from sandstone and shale <br />Properties and Qualities <br />Slope: 5to 30 percent <br />Depth to restrictive feature: 10 to 80 inches to Lithic bedrock <br />Drainage class: Well drained <br />Capacity of the most limiting layer to transmit water (Ksat): Moderately low or moderately high (0.06 to 0.20 in/hr) <br />Frequency of flooding: None <br />Frequency of ponding: None <br />Calcium carbonate maximum: 15 percent <br />Gypsum maximum: 0 percent <br />Available water capacity: Low (about 3.7 inches) <br />Interpretive Groups <br />Land capability (non irdgated): 6e <br />Other vegetative classification: Pinyon-Juniper (null tit) <br />Typical Profile <br />0 to 4 inches: very bouldery clay loam <br />4 to 31 inches: cobbly clay loam <br />31 to 35 inches: unweathered bedrock <br />USA Natural Resources <br />Conservation Service Tabular Data Version: 4 <br />Tabular Data Version Date: 01/10/2007 <br />Page I-7 <br />