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

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166 — Routt loam, 3 to 25 percent slopes Map Unit Setting Major Land Resource Area: 48A Elevation: 7,000 to 8,000 feet (2,134 to 2,438 meters) Mean annual precipitation: 18 to 20 inches (457 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 Routt and similar soils: 80 percent Minor components: 20 percent Component Descriptions Routt soils Landform: Mountainsides, plateaus Parent material. Loess and residuum derived from shale Slope: 3 to 25 percent Drainage Class: Well drained Slowest permeability: .06 to 0.2 in./h r. (slow) Available water capacity, About 10.3 inches (moderate) Shrink -swell potential. About 4.5 percent (moderate) Hazard of flooding: None Depth to seasonal high water table: Greater than 72 inches Runoff class: High Routt Series Map Unit. 166 Depth class: very deep Drainage Class: well drained Slowest permeability: .06 to 0.2 in./hr. (slow) Landform: hills, mountainsides, plateaus Position on landform: backslopes Parent material. loess and residuum derived from shale Elevation: 7,000 to 8,200 feet (2,134 to 2,499 meters) 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, montmorillonitic Cryic Pachic Paleborolls Typical Pedon Map Unit in which located. Routt loam, 3 to 25 percent slopes Oi - 0 to 2 inches, very dark brown (10YR 3/4) and dark brown (10YR 3/3) slightly decomposed leaves and twigs. Al - 2 to 10 inches; dark gray (10YR 4/1) loam, black (10YR 2/1) moist; weak very coarse to medium granular structure; slightly hard, friable, slightly sticky and slightly plastic; neutral; clear wavy boundary. Calcium carbonate maximum: None Gypsum maximum: None Salinity maximum: About 0 mmhos/cm (nonsaline) Sodium adsorption ratio: About 0 (nonsodic) Ecological site: Brushy Loam Potential native vegetation: Gambel's Oak, Saskatoon serviceberry, mountain brome, Letterman's needlegrass, elk sedge, mountain snowberry, nodding brome, slender wheatgrass Land capability subclass: (nonirrigated) 6e Typical profile 0 to 2 inches - slightly decomposed plant material 2 to 27 inches - loam 27 to 33 inches - clay loam 33 to 60 inches - clay Minor Components Foidel and similar soils Composition: About 5 percent Claybum and similar soils Composition: About 5 percent Binco and similar soils Composition: About 5 percent Cochetopa and similar soils Composition: About 5 percent Slope: 3 to 30 percent A2 - 10 to 27 inches; dark gray (10YR 4/1) loam, black (10YR 2/1) moist; moderate fine and medium granular structure; soft, very friable, slightly sticky and slightly plastic; neutral; clear wavy boundary. E/B - 27 to 33 inches; 80 percent gray (10YR 6/2) and 20 percent brown (10YR 5/3) clay loam, very dark gray (10YR 3/2) and dark gray (10YR 3/3) moist; moderate medium angular blocky structure; hard, friable, sticky and plastic; neutral; clear wavy boundary. B/E - 33 to 39 inches; 60 percent light olive brown (2.5Y 5/3) and 30 percent light brownish gray (2.5Y 6/2) clay, olive brown (2.5Y 3/3) and very dark grayish brown (2.5Y 3/2) moist; strong medium angular blocky structure; very hard, firm, very sticky and very plastic; neutral; clear wavy boundary. Bt - 39 to 60 inches; light olive brown (2.5Y 5/3) clay, olive brown (2.5Y 4/4 moist; strong medium prismatic structure parting to moderate coarse angular blocky structure; very hard, firm, very sticky and plastic; few faint clay films on faces of peds; neutral. Range in Characteristics Particle -size control section (weighted average) Rock fragment content: 0 to 5 percent Thickness of the mollic epipedon: 20 to 30 inches Note: Depth to the base of the argillic horizon is 60 inches or more, depth to the top of the argillic horizon is 24 to 35 inches E/B horizon: Texture: loam or clay loam Bt horizon: Hue: 7.5YR through 2.5Y Texture: clay loam or clav