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Evapotranspiration Reduction Method <br />The following table presents a summary of the assumptions for, and results of, the <br />nitrate loading calculation for the Site when recharge is derived by the <br />evapotranspiration reduction method, as presented in Plate 13. A modified version of <br />this method is currently being developed by the San Joaquin County Environmental <br />Health Department; full details of the recommended method are not yet available. <br />Table 5. Inputs and Results for Nitrate Loading Calculation, <br />Recharge Derived from Evapotranspiration Reduction Method <br />Variable Value Units Description <br />420 gpd Effluent flow rate <br />Nw 35 mg/L-N Effluent stream concentration <br />A 1.00 acres Site area <br />Nb 1.00 mg/L-N Concentration of rain <br />0.25 constant Denitrification factor <br />12.6 inches per year Recharge rate of percolating waters <br />inches per year Uniform waste water loading (calculated) <br />Nc 8.8 mg/L-N Long-term average concentration of percolating <br />effluent <br />Reduced Rainfall Method <br />The following table presents a summary of the assumptions for, and results of, the <br />nitrate loading calculation for the Site when recharge is derived by the reduced rainfall <br />method, as presented in Plate 14. This method has been accepted by the San Joaquin <br />County Environmental Health Department from January 2017 through January 2019. <br />LOGE 1906 Page 14