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<br /> <br />;• <br /> <br />S--Arents, 10 to 45 percent slopes <br />Ihls soils information is not silo <br />apecliic. Onsile irtveatiyation, <br />testing end analysis by compc;ent <br />Personnel is needed b=fore construc• ~; 33 <br />lion or other engineering use of wile. <br />These deep, well dra~ne•] <br />soils era on man-made hills. The soils are formed in mixed coal <br />mining spoil and overburden materials that have been redistributed and <br />deposited to a thickness of more than 5 feet. Slopes range from about <br />5 to 55 percent; however, slope is dominantly 10 to 45 percent. Mott <br />slopes are about 50 to 300 feet long. The longer, steeper slopes, <br />however, era divided by contour terraces to reduce the effective slope <br />length. Tha size of delineations range from about 5 to 400 acres in <br />size. This unit has been planted to a mixture of trees, grasses, <br />fortis, and shrubs. Elevation is 5,500 to 6,100 feet. The average <br />annual precipitation is 12 to 14 inches, the average annual air <br />temperature is 50 to 52 degrees F, and the average frost-free period <br />is 130 to 150 days. <br />These man-made soils are highly variable. To the extent <br />practical, materials better suited to supporting plant growth wore <br />deposited to make up the upper 2 to 3 feet of the new soils. The <br />fine-earth fraction of the soil materials varies from loamy sand to <br />silty clay loam. Dominant textures are loam, sandy loam, sandy clay <br />loam, clay loam, and silt loam. Soil reaction is extremely acid to <br />moderately alkaline. The reaction of the upper 10 inches is commonly <br />5.2 (strongly acid) or higher. The content of boulders, stones, <br />cobbles, and gravel is greater than 35 percent by volume in about 20 <br />percent of the mapping unit. In these areas it ranges from about 35 <br />to 80 percent. Hard rock fragment content is generally about 5 to ZS <br />percent in other areas. <br />i <br />C'~ <br />