Laserfiche WebLink
EXHIBIT C.H.1 <br />GrA--Grayco sandy loam, 0 to 2 <br />percent slopes <br />Map Unit Setting <br />Major Land Resource Area. 51 <br />Elevation: 7,500 to 8,500 feet (2,286 to 2,591 <br />meters) <br />Mean annual precipitation: 8 to 12 inches (203 <br />to 305 millimeters) <br />Mean annual air temperature. 39 to 43 degrees <br />F. (4.0 to 6.0 degrees C.) <br />Frost-free period: 85 to 100 days <br />map unit Composition <br />Grayco and similar soils: 85 percent <br />Minor components: 15 percent <br />Component Descriptions <br />Grayco soils <br />Landscape: intermontain basins <br />Landform. Alluvial flats <br />Parent material. Fine-loamy over sandy and <br />gravelly alluvium derived from igneous, <br />metamorphic and sedimentary rock <br />Slope: 0 to 2 percent <br />Surface fragments: About 25 percent <br />subrounded indurated mixed gravel <br />Drainage class: Well drained <br />Slowest permeability. 0.2 to 0.6 in/hr <br />(moderately slow) <br />Available water capacity: About 2.4 inches (very <br />low) <br />Shrink-swell potential: About 1.5 percent (low) <br />Flooding hazard: None <br />Ponding hazard. None <br />Runoff class. Low <br />Calcium carbonate maximum: About 10 percent <br />Gypsum maximum. None <br />Salinity maximum: About 2 mmhoslcm <br />(nonsaline) <br />Sodium adsorption ratio maximum: About 0 <br />(nonsodic) <br />Ecological site. Mountain Oulwash <br />Potential native vegetation. blue grama. <br />Wyoming big sagebrush, needleandthread, <br />ribber rabbitbrush, winterfat, Indian <br />ricegrass, bottlebrush squirreltal, ring muhly, <br />sand dropseed, western wheatgrass <br />Land capability subclass (irrigated): 4s <br />Land capability subclass (nonirrrgated): 6s <br />Typical Profile: <br />A-0 to 4 inches; sandy loam <br />Bt-4 to 14 inches; loam <br />Bk1-14 to 18 inches; very gravelly sandy <br />loam <br />28k2-18 to 24 inches; extremely gravelly <br />loamy sand <br />2Bk3-24 to 43 inches; extremely gravelly <br />sand <br />2C-43 to 80 inches; extremely gravelly <br />sand <br />Minor Components <br />IGbin and similar soils <br />Composition: About 10 percent <br />Landscape. Intermontain basins <br />Landform. Stream terraces <br />Slope: 0 to 3 percent <br />Depth to restrictive feature: 20 to 40 inches <br />to strongly contrasting textural <br />stratification <br />Drainage class: Well drained <br />Flooding hazard. None <br />Ecological site. Valley Bench <br />Fuertes and similar soils <br />Composition: About 3 percent <br />Landscape: Intermontain basins <br />Landform. Stream terraces <br />Slope: 0 to 2 percent <br />Drainage class: Somewhat poorly drained <br />Flooding hazard. None <br />Ecological site: Valley Bench <br />Trinchera and similar soils <br />Composition: About 2 percent <br />Landscape: Intermontam basins <br />Landform: Alluvial flats, fan remnants <br />Position on landform: Backslopes <br />Slope: 0 to 1 percent <br />Drainage class: Well drained <br />Flooding hazard: None <br />Ecological site: Foothill Loam