2018-01-03_PERMIT FILE - C1981010 (7)

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3- Adderton loam, 1 to 10 percent slopes Map Unit Setting Major Land Resource Area: 47 Elevation: 7,000 to 8,500 feet (2,134 to 2,591 meters) Mean annual precipitation: 16 to 20 inches (406 to 508 millimeters) Average annual air temperature: 37 to 40 degrees F (2.8 to 4.4 degrees C) Frost -free period: 50 to 75 days Map Unit Composition Aquolls and similar soils: 90 percent Minor components: 10 percent Component Descriptions Adderton soils Landform: Alluvial fans, drainageways Parent material. Alluvium derived from sedimentary rocks Slope: 1 to 10 percent Drainage Class: Well drained Slowest permeability: 0.6 to 2.0 in./hr. (moderate) Available water capacity: About 10.4 inches (high) Shrink -swell potential: About 1.5 percent (low) Hazard of flooding: Rare Runoff class: Medium Available water capacity. About 10.4 inches (high) Shrink -swell potential: About 1.5 percent (low) Hazard of flooding: Rare Runoff class: Medium Adderton Series Map unit(s): 3 Depth class: very deep Drainage class: well drained Slowest permeability: 0.6 to 2.0 in./hr. (moderate) Landform: alluvial fans, drainageways Parent material: alluvium derived from sedimentary rocks Elevation: 7,000 to 8,500 feet (2,134 to 2,591 meters) Slope: 1 to 10 percent Climatic data: Mean annual precipitation: 16 to 20 inches (406 to 508 millimeters) Mean annual air temperature: 37 to 40 degrees F. (2.8 to 4.4 degrees C.) Frost -free period: 50 to 75 days Taxonomic class: Fine -loamy, mixed Cumulic Cryoborolls Typical Pedon Map Unit in which located: Adderton loam, 1 to 10 percent slopes Al - 0 to 4 inches; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; weak fine granular structure, soft, very friable, nonsticky and nonplastic; slightly acid; clear wavy boundary. A2 - 4 to 11 inches; very dark gray (10YR 3/1) loam, black (10YR 2/1) moist; moderate medium subangular blocky structure, slightly hard, slightly sticky and slightly plastic: neutral: clear waw boundarv. Calcium carbonate maximum: None Gypsum maximum: None Salinity maximum: About 0 mmhos/cm (nonsaline) Sodium adsorption ratio maximum: About 0 (nonsodic) Ecological site: Mountain Swale Potential native vegetation: basin wildrye, slender wheatgrass, western wheatgrass, Letterman's needlegrass, mountain big sagebrush, mountain brome, mountain snowberry. Land capability subclass: (nonirrigated) 6c Typical profile 0 to 22 inches - loam 22 to 39 inches - loam 39 to 60 inches - fine sandy loam Minor Components Moderately well and somewhat poorly drained soils and similar soils Composition: About 10 percent Landform: Stream terraces A3 - 11 to 22 inches; very dark gray (10YR 3/1) loam, black (10YR 2/1) moist; weak medium prismatic structure parting to strong coarse and medium angular blocky, hard, friable, slightly sticky and slightly plastic; neutral; clear wavy boundary. C1 - 22 to 39 inches; dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; weak medium prismatic structure parting to moderate, medium and coarse angular blocky; slightly hard, friable, slightly sticky and slightly plastic; neutral; diffuse wavy boundary. C2 - 39 to 60 inches; brown (10YR 4/3) fine sandy loam, very dark grayish brown (10YR 3/2) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; neutral. Range in Characteristics Particle -size control section (weighted average): Clay content: 18 to 35 percent Rock fragment content. 0 to 5 percent gravel, thin lenses containing 15 to 35 percent rock fragments occur in some pedons. Depth to effervescence: 40 inches or more Thickness of the mollic epipedon: 16 to 60 inches. A3 and C1 horizons: Texture: loam, sandy clay loam, or clay loam Reaction: neutral to slightly alkaline C2 horizon: Hue 10YR to 7.5 YR Texture: sandy loam to fine sandy loam Reaction: neutral to slightly alkaline