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SITE DESCRIPTION <br />Revegetating disturbed areas around construction <br />sites as soon as possible helps to control soil blowing. <br />This map unit is in capability subclass Vie, <br />nonirrigated. It is in Sandy Foothills range site. <br />77-Schamber-Midway complex, 3 to 25 percent <br />slopes. <br />This map unit is on hills, terrace edges, and side <br />slopes. The native vegetation is mainly grass. <br />Elevation is 5,500 to 6,600 feet. The average annual" <br />precipitation is 12 to 15 inches, the average annual air <br />temperature is 49 to 54 degrees F, and the average <br />frost-free period is 125 to 155 days. <br />This unit is about 65 percent Schamber sandy <br />loam and about 20 percent Midway clay. The <br />Schamber soil is in the gently sloping areas and on <br />hilltops, and the Midway soil is on the steeper side <br />slopes. The components of this unit are so intricately <br />intermingled that it was not practical to map them <br />separately at the scale used. <br />Included in this unit is about 15 percent Kim fine <br />sandy loam on foot slopes and in drainageways. <br />The Schamber soil is deep and excessively drained. It <br />formed in alluvium. Typically, the surface layer is <br />brown gravelly sandy loam about 5 inches thick. The <br />next 25 inches is mainly very gravelly loamy sand. <br />Below this to a depth of 60 inches or more is very <br />gravelly sand. The soil is moderately alkaline <br />throughout. <br />Permeability of the Schamber soil is very rapid. <br />Available water capacity is very low. Effective <br />rooting depth is 60 inches or more. Runoff is <br />medium, and the hazard of water erosion is moderate <br />to very high. <br />The Midway soil is shallow and well drained. It <br />formed in residuum and colluvium derived <br />dominantly from shale. Typically, the surface layer is <br />grayish brown clay about 3 inches thick. The next 3 <br />inches is clay. Below this is clay about 12 inches <br />thick. Platy shale is at a depth of 15 inches. The soil <br />is moderately alkaline and slightly saline throughout. <br />Permeability of the Midway soil is slow. <br />Available water capacity is very low. Effective <br />rooting depth is 10 to 20 inches. Runoff is rapid to <br />very rapid, and the hazard of water erosion is very <br />high. <br />This unit is used as rangeland. <br />The potential plant community on this unit is <br />mainly sideoats grama, blue grama, and Indian <br />ricegrass. Other grasses that characterize the unit are <br />needleandthread and sand dropseed. The average <br />annual production of air-dry vegetation is about 700 <br />pounds per acre. If the condition of the range <br />deteriorates, rabbitbrush, threeawn, yucca, and cactus <br />increase. Livestock grazing should be managed to <br />EXHIBIT B (CONT) <br />protect the unit from excessive erosion. The main <br />limitations for seeding are droughtiness and very <br />gravelly material near the surface of the soils. <br />This unit is poorly suited to windbreaks and <br />environmental plantings. The main limitations are the <br />salinity, limited rooting depth, and slope of the <br />Midway soil and the droughtiness of both of the soils <br />in the unit. <br />If this unit is used for homesite development, the <br />main limitations are slope in the steeper shaly areas <br />and shrink-swell potential. The gently sloping areas <br />of the Schamber soil are well suited to homesite <br />development. <br />Effluent from septic tank absorption fields can <br />surface in downslope areas and thus create a hazard <br />to health. <br />This map unit is in capability subclass VIIs, <br />nonirrigated. About 75 percent of the unit is in Gravel <br />Breaks range site, and 25 percent is in Shaly Plains <br />range site.