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G) m <br /> CD 0 <br /> o y <br /> o � <br /> cn <br /> U) <br /> o_ <br /> P <br /> Ca <br /> Q <br /> m Table 4.7-3 <br /> cn <br /> Soil Mapping Unit Descriptions <br /> Soil Series Depth Shrink- Permeability Erosion Factors2 Wind Plasticity <br /> Map Name (inches) USDA texture Swell (in/hr) Erodibility pH Index4 <br /> Potential K T Group3 <br /> 255 Tinnin 0-28 Loamy coarse sand Low 6.0-20 0.17 5 2 6.1-7.8 NP <br /> 28-53 Loamy coarse sand,loamy sand Low 6.0-20 0.17 6.1-7.8 NP <br /> 53-75 Loamy coarse sand,loamy sand, sand Low 6.0-20 0.17 6.6-8.4 NP <br /> 260 Urban Land --- --- --- --- --- --- --- <br /> 266 Veritas 0-15 Fine sandy loam Low 2.0-6.0 0.28 3 3 7.4-8.4 NP-10 <br /> 15-54 Sandy loam,fine sandy loam Low 2.0-6.0 0.32 7.4-8.4 NP-10 <br /> 0 <br /> 54-70 Cemented --- --- --- --- --- <br /> Soil map numbers refer to numbers shown on Exhibit 4.7-1 (Soils Map of Project Area). <br /> s K is a measurement of relative susceptibility to sheet and rill erosion by water. It ranges from 0.10 to 0.64,with lower values representing a lower susceptibility to erosion. <br /> a� <br /> T represents soil loss tolerance,which is defined as the maximum rate of soil erosion(wind and water)without reducing crop production or environmental quality.Values range from <br /> CD <br /> iv 1 to 5 tons of soil loss per acre per year,with 5 representing soils less sensitive to erosion. <br /> kJ <br /> 3 A measure of the susceptibility of soil to movement by wind.Groups are 1 through 8,with 8 being soil types not subject to soil blowing because of coarse fragments on the surface or <br /> n surface wetness. <br /> n <br /> Soils with a high plasticity index have a wide range of moisture content in which the soil performs as a plastic material.Larger PI values(e.g.20-40)indicate highly plastic soils. <br /> n <br /> C NP=Not plastic <br /> o <br /> m --- Either not measured or not applicable. <br /> a Source: USDA Soil Conservation Service 1992. <br /> o' <br /> CD <br /> n � <br /> in <br /> o <br /> � m <br /> v in <br /> CD m <br /> 0 70 <br />