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80 <br />(Frar4le-C <br />Mean annual precipitation: 10 to 12 inches (254 to 1 <br />305 millimeters) <br />Mean annual air temperature: 42 to 45 degrees F. <br />(5.6 to 7.2 degrees C.) <br />Freeze-free period. 75 to 95 days <br />Map Unit Composition <br />Fonce and similar soils: 90 percent <br />Minor components: 10 percent <br />Component Descriptions <br />Fonce soils <br />Landform: Plateaus <br />Parent material: Eolian deposits over relict fluvial <br />deposits derived from mixed sources <br />Slope: 1 to 8 percent <br />Drainage class: Well drained <br />Slowest permeability: 0.6 to 2.0 in./hr. (moderate) <br />Available water capacity: About 3.9 inches (low) <br />Shrink -swell potential: About 1.5 percent (low) <br />Runoff class: Medium <br />Calcium carbonate maximum: About 40 percent <br />Gypsum maximum: None <br />Salinity maximum: About 4 mmhos/cm (very slightly <br />saline) <br />Sodium adsorption ratio maximum: About 0 <br />(nonsodic) <br />Ecological site: Loamy 7-10" PPT <br />Potential native vegetation: Wyoming big sagebrush, <br />Indian ricegrass, needleandthread, streambank <br />wheatgrass, streambank wheatgrass, Sandberg <br />bluegrass, bluebunch wheatgrass, prairie <br />Junegrass, western wheatgrass <br />Land capability subclass (nonirrigated): 6c <br />Typical Profile: <br />0 to 3 inches; sandy loam <br />3 to 15 inches; sandy clay loam <br />15 to 33 inches; very gravelly coarse sandy loam <br />33 to 60 inches; gravelly sand <br />Minor Components <br />Soils with sandy loam upper subsoils and similar <br />soils <br />Composition: About 5 percent <br />Soils with less than 15 percent calcium carbonate <br />and similar soils <br />Composition: About 3 percent <br />Soils with very gravelly upper subsoils and similar <br />soils <br />Composition: About 2 percent <br />Soil Survey <br />Fonce gravelly sandy loam, 3 to 12 <br />percent slopes, very stony <br />Map Unit Setting <br />Maj Land Resource Area: 34 <br />Ele 'on: 7,000 to 7,800 feet (2,134 to 2,377 eters) <br />Mean nnual precipitation: 11 to 13 inches (2 to <br />33 millimeters) <br />Mean nual air temperature: 42 to 45 degr s F. <br />(5.6 0 7.2 degrees C.) <br />Freeze -f a period. 75 to 95 days <br />Map Unit Composition <br />Fonce and imilar soils: 90 percent <br />Minor com nents: 10 percent <br />Fonce soils <br />Landform: Fan rraces <br />Parent materia Colluvium and all ium derived from <br />sandstone <br />Slope: 3 to 12 p ent <br />Surface fragment About 2 perc t stones <br />Drainage class: I drained <br />Slowest permeabili :0.6to 2. in./hr. (moderate) <br />Available water cap ity: Abo 4.5 inches (low) <br />Shrink -swell ll <br />About .5 percent (low) <br />Runoff class: Mediu <br />Calcium carbonate in im : About 40 percent <br />Gypsum maximum: N e <br />Salinity maximum: Abo mmhos/cm (nonsaline) <br />Sodium adsorption ratio aximum: About 0 <br />(nonsodic) <br />Ecological site: Shallo pes <br />Potential native veget ion. treambank wheatgrass, <br />streambank whe gras black sagebrush, <br />bluebunch whe rass, ttlebrush squirreltail, <br />needleandthre <br />Land capability s class (non - ated): 6s <br />Typical Profile: <br />0 to 2 inchf; gravelly sandyl <br />2 to 16 in es; gravelly sandy <br />.16 to 30 ches; very cobbly <br />y sandy loam <br />inches; very gravelly <br />30 to <br />Minor <br />Very, <br />soils and similar soils <br />sition: About 5 percent <br />loam <br />loam, very <br />loam <br />