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ADVANCED COPY SUBJECT TO CHANGE <br />• <br />• <br />986-Mudcap-Slicktop complex, <br />to 6 percent slopes <br />Map Unit Setting <br />Major Land Resource Area: 48A <br />Elevation: 6,500 to 8,000 feet (1,981 to 2,438 <br />meters) <br />Mean annual precipitation: 14 to 20 inches (356 <br />to 508 millimeters) <br />Mean annual air temperature: 43 to 45 degrees <br />F. (6.1 to 7.2 degrees C.) <br />Freeze-free period: 80 to 115 days <br />Map Unit Composition <br />Mudcap and similar soils: 45 percent <br />Slicktop and similar soils: 40 percent <br />Minor components: <br />Component Descriptions <br />Mudcap soils <br />Landscape: Unspecified <br />Landform: Alluvial fans, hills, valley floors, <br />stream terraces <br />Position on landform: Toeslopes <br />Parent material. Silty and clayey alluvium <br />derived from calcareous shale over gravelly <br />alluvium and/or gravelly glaciofluvial deposits <br />Slope: 1 to 6 percent <br />Surface fragments: About 0 percent subrounded <br />cobbles, about 0 percent subrounded gravel <br />Depth to restrictive feature: Unspecified <br />Drainage class: Somewhat poorly drained <br />Slowest permeability..06 to 0.2 in/hr (slow) <br />Available water capacity: About 6.3 inches <br />(moderate) <br />Shrink-swell potential: About 0.2 percent (low) <br />Flooding hazard: None <br />Ponding hazard: None <br />Seasonal high water table depth: About 12 to 36 <br />inches <br />Runoff class: High <br />Calcium carbonate maximum: About 35 percent <br />Gypsum maximum: About 1 percent <br />Salinity maximum: About 16 mmhos/cm <br />(moderately saline) <br />Sodium adsorption ratio maximum: About 4 <br />(slightly sodic) <br />Relative effective annual precipitation: greater <br />than 24 inches (610 millimeters) <br />Ecological site: Unspecified <br />Potential native vegetation: Unspecified <br />Land capability subclass (irrigated): 3e <br />Land capability subclass (nonirrigated): 4c <br />Bt-7 to 20 inches; clay loam <br />Btk-20 to 30 inches; gravelly clay loam <br />2Bk-30 to 47 inches; very gravelly loam <br />2C-47 to 58 inches; extremely gravelly <br />sandy loam <br />Slicktop soils <br />Landscape: Unspecified <br />Landform: Alluvial fans, hills, stream terraces, <br />valley floors <br />Position on landform: Toeslopes <br />Parent material. Silty and clayey alluvium <br />derived from calcareous shale over gravelly <br />alluvium and/or gravelly glaciofluvial deposits <br />Slope: 1 to 6 percent <br />Surface fragments: About 1 percent subrounded <br />gravel, about 1 percent subrounded cobbles <br />Depth to restrictive feature: Unspecified <br />Drainage class: Poorly drained <br />Slowest permeability:.06 to 0.2 in/hr (slow) <br />Available water capacity: About 4.6 inches (low) <br />Shrink-swell potential: About 0.0 percent (low) <br />Flooding hazard: None <br />Ponding hazard: None <br />Seasonal high water table depth: About 0 to 12 <br />inches <br />Runoff class: High <br />Calcium carbonate maximum: About 35 percent <br />Gypsum maximum: About 1 percent <br />Salinity maximum: About 16 mmhos/cm <br />(moderately saline) <br />Sodium adsorption ratio maximum: About 4 <br />(slightly sodic) <br />Relative effective annual precipitation: greater <br />than 24 inches (610 millimeters) <br />Ecological site: Unspecified <br />Potential native vegetation: Unspecified <br />Land capability subclass (irrigated): 3e <br />Land capability subclass (nonirrigated): 4c <br />Typical Profile: <br />O" to 2 inches; highly decomposed plant <br />material <br />Atp-2 to 9 inches; clay loam <br />Bt-9 to 15 inches; clay <br />26tk-15 to 22 inches; very gravelly clay <br />loam <br />213k-22 to 39 inches; very gravelly loam <br />2C-39 to 60 inches; extremely cobbly <br />loamy sand <br />1/22/04 ceg <br />Typical Profile: <br />Ap-0 to 2 inches; loam <br />Atp-2 to 7 inches; clay loam