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<br />A discussion of topsoil suitability by class is provided for each soil series <br />or series variant. The mapping units contain various slope ar.d erosion phases <br />as well as complexes or associations of soil series phases and phases of series <br />variants. These mopping units are cl:rssi(ied in 'I':iblu i-1 rind h:iv~~ thr. gen~:rnl <br />suitability characteristics for the specific class or range of classes as <br />discussed in Section 7.1.1 through 7.1.4 below. <br />(1) Class 1 <br />These soils are deep with fair to good suitability as a plant-growth medium. <br />Depth of topsoil available material ranges from 40 inches to about six feet. <br />Many of these soils have fine-loamy surface horizons which are rich in organic <br />• matter. <br />Class 1 soil series in the survey area are Colorow, Forelle, Kinnear, Potts, <br />Turley, 'Curley Variant and Yamac. These soils predominantly have sandy loam to <br />loam A horizons; sandy loam to clay loam R horizons, where applicable; and <br />calcareous mixed loamy C horizons. They are well-drained with medium runoff <br />and moderate to moderately rapid permeability. They are nonsaline and nonalkaline <br />to depths of three feet or more. Wind and water erosion hazard is moderate to <br />high. Tilth at optimum moisture is good to very good. The potential for compaction <br />is low to moderate. Soil structure has fair to very good stability against wet <br />slumping. Crusting potential of these soils upor, drying is low to moderate. <br />• <br />II.I-26 <br />Revised 4/81 <br />