2013-02-12_PERMIT FILE - M2013007 (16)

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Map Unit Description— Ridgway Area, Colorado, Parts of Delta, Gunnison, Montrose, and Ouray Counties USDA Natural Resources Conservation Service Ecological site: Loamy Saltdesert (R034XY401 CO) Fruitland Percent of map unit: 5 percent Landform: Alluvial fans, fan remnants, stream terraces, valley floors Landform position (three- dimensional): Riser, tread Eco logical site: Sandy Saltdesert (R035XY402C0) Lizzydea Percent of map unit: 5 percent Landform: Alluvial fans, fan remnants, stream terraces, valley floors Landform position (three- dimensional): Tread, riser Ecological site: Semidesert Loam (R035XY325C0) Samirockson Percent of map unit: 5 percent Landform: Alluvial fans, fan remnants, stream terraces, valley floors Landform position (three- dimensional): Tread, riser Ecological site: Semidesert Loam (R035XY325C0) 709 — Montrose silty clay loam, 2 to 6 percent slopes Map Unit Setting Elevation: 4,800 to 6,200 feet Mean annual precipitation: 8 to 10 inches Mean annual air temperature: 49 to 51 degrees F Frost -free period: 140 to 160 days Map Unit Composition Montrose and similar soils: 80 percent Minor components: 20 percent Description of Montrose Setting Landform: Alluvial fans, fan remnants, stream terraces Landform position (three - dimensional): Tread, riser, flat Down -slope shape: Linear Across -slope shape: Linear Parent material: Clayey alluvium derived from calcareous shale Properties and qualities Slope: 2 to 6 percent Depth to restrictive feature: More than 80 inches Drainage class: Well drained 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 content: 15 percent Gypsum, maximum content: 4 percent Maximum salinity: Nonsaline to very slightly saline (0.0 to 4.0 mmhos/ cm) Web Soil Survey National Cooperative Soil Survey 10/27/2012 Page 14 of 63