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C = 0.05 "C" represents the effects of plants, soil cover, soil biomass (roots <br />and incorporated residue), and soil-disturbing activities on soil loss. <br />A value of 0.05 is associated with the presence of well established <br />California annual grasses. <br />P = 0.9 "P" accounts for reduction of erosion due to land management <br />practices and is conservatively assumed to be 0.9 can be used for <br />track-walked slopes. <br />Using the values listed above, we estimate the average soil loss depth due to water erosion to be <br />0.0076 inch per year in the presence of vegetation. <br />Discussion <br />Based on the above soil erosion analysis, the average soil loss depth for a soil density of <br />99.7 pounds per cubic foot is about 0.0076 inch per year or 1.66 ton/acre/year for the entire <br />vegetated landfill site. This value is below the recommended USEP A maximum of <br />2 tons/acre/year. Over the 30-year period, the average soil loss over the entire site is <br />conservatively estimated at approximately 0.23 inches. The 30-year loss represents significantly <br />less than 1 % of the proposed final cover layer of 54 inches. <br />References <br />U.S. Department of Agriculture, 1997, Predicting Soil Erosion by Water: A Guide to <br />Conservation Planning With the Revised Universal Soil Loss Equation, Agricultural Research <br />Services, Agriculture Handbook Number 703. <br />Attachments <br />Table 1 -Soil Loss Estimates <br />Figure 1 -Soil Loss Areas <br />Figure 2-3 from USDA, 1997 <br />Figure 3-1 from USDA, 1997 <br />Table 4-5 from USDA, 1997 <br />O:\San Joaquin County\136605 Foolhill\Soi! Loss\Draft Soil loss Text.doc B-2 July 28, 2010