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C7 <br />U <br />C7 <br />COVER SOIL LOSS CALCULATIONS <br />Soil loss potential at the Foothill Sanitary Landfill site due to water erosion was evaluated using <br />the Revised Universal Soil Equation (RUSLE); developed by the U.S. Department of <br />Agriculture, which considers soil and vegetation type as well as physical and climatic features of <br />the landfill area. A brief discussion of this method is given below. <br />Soil Loss Evaluation <br />The RUSLE can be used to evaluate landfill cover soil loss. This equation may be stated as: <br />A = R K LS C P, Where <br />A = Average annual soil loss, in tons per acre per year <br />R = Rainfall and runoff erosivity index <br />K = Soil erodibility factor <br />LS = Hill slope length and steepness factor <br />C = Cover -management factor <br />P = Support practice factor <br />For the purpose of soil loss analysis, the landfill was divided into lots based upon the average <br />slopes of the final cover and surface drainage characteristics as shown in Figure 1. The results of <br />the analysis are shown in Table 1. <br />The RUSLE factors for the Foothill Sanitary Landfill were assigned as follows: <br />R=25 Index for eastern San Joaquin County area from RUSLE database <br />using Fig. 2-3, USDA, 1997, which represents weather conditions at <br />the site. <br />K =.45 It is assumed that the textural class of the final cover material will be <br />of a "silty loam" based on the average grain size distribution curve <br />of the proposed final cover material and will contain less than 1.0 % <br />organic materials. <br />LS Dependent upon the length and average gradient of area under <br />consideration. Values range from 1.09 to 10.58 for this application. <br />01San Joaquin County1136605 Foothill\Soil Loss\Drafl Soil Loss Text.doc B— I <br />July 28, 2010 <br />