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Grobutte Stony Loam, 25 to 65 Percent Slopes <br />• <br />The Grobutte series consists of deep, well-drained, calcareous soils <br />formed in gravelly alluvium and colluvium. These soils occur on steep <br />hillsides and terrace breaks. <br />This series was disturbed by construction of the truck dump site. <br />Permeability of the Grobutte series is rapid. Available water holding <br />capacity is low. Slope, stone, and seepage severely limit the suita- <br />bility of the Grobutte soils for engineering uses including sanitary <br />facilities and for use as roadfill. This soil is a poor source of <br />either topsoil or gravel and is unsuited as a source for sand. Deep <br />trenches in this soil are apt to cave-in unless the banks are stabi- <br />lized in some manner, such as being sprayed with some sort of <br />cementing compound. <br />Yamac sandy loam, 1 to 2 percent slopes <br />• This deep, well drained soil is on alluvial fans at elevations of <br />6,500 to 7,000 feet. It formed in alluvium from mixed sedimentary <br />rocks. Typically the surface layer is brown sandy loam about 3 inches <br />thick. The subsoil is brown sandy laom about 7 inches thick. The <br />substratum is calcareous loam that extends below 60 inches. <br />Permeability is moderate. Effective rooting depth is greater than 60 <br />inches. Available water capacity is 0.16 to 0.18 in./in. Surface <br />runoof is moderability high and erosion hazard is moderate. <br />Unnamed Loam, 1 to 6 Percent Slopes <br />This is a deep, well-drained soil on upland hills, valleys, and <br />benches at elevations of 5,000 to 7,000 feet. It formed in loess- <br />influenced Redbed parent materials and alluvium. <br />• <br />3-118 <br />