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11 • SOIL MAPPING UNIT P7O. 2 This unit is very limited in extent, it shows the loca- tion of soils where shale was encountered within a 60-inch depth. Both the subsoil and underlying shale material could be utilized for stabilizing roads. From a revegetation and stabilization point of view, the top 12 inches from this unit would be suitable topsoil material. SOIL MAPPING UNITS N0. 3 & 4 These units reflects the extent and location of soils which have approximately 9 to 6 inches of surface soil that if salvaged would be more suitable as topsoil material than any of the materials below this depth. The soil layer (AC horizons of the Valent soil as des- cribed in this report) that underlies the surface layer varies in thickness from 8 to 12 inches and is slightly • higher in organic matter and in fertility than the materials below. However, this layer is more like the underlying ma- terial than the surface layer. The potential benefit of salvaging this material separately to use as subsurface soil is questionable. And since it is more like the underlying materials (C horizons) it is not recommended that it be mixed with the A horizon materials. SOIL MAPPING UNIT NO. 5 This unit reflects the extent and location of soils which have the thinnest and least uniform occurrence of topsoil material. These areas reflect recent wind erosion activities. The topography is described as being "choppy" and a number of "blow-out" areas occur. These areas will become very susceptible to wind erosion if and when they are disturbed. In some areas the surface layer is very similar in physical and chemical characteristics to the substratum (C horizon) materials of the Valent soils. If volume of available topsoil calculations are made for this unit, it is recommended that the volume be reduced by 50 percent, if the calculations are based on the thickness . of the surface horizon of the typical Valent soil as des- cribed in this report.