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Calculated Rates of Recharge from Percolating Waters for Project Site The following table summarizes the potential values for rate of recharge from percolating waters: Table 4. Rates of Recharge from Percolating Waters for Site Method Result (in./yr.) Comment 100 Percent Rainfall 17.75 Likely overestimates recharge from percolating waters Evapotranspiration Reduction 12.6 Likely underestimates recharge from percolating waters in many parts of the County. A modified version of this method is currently being developed by the San Joaquin County Environmental Health Department; some adjustments to the method may be forthcoming from that agency Reduced Rainfall 13.3 Method accepted by San Joaquin County Environmental Health Department from January 2017 through January 2019 Regional Recharge from Percolating Waters 10.1 Regional average for subbasin Live Oak favors the reduced rainfall method based on its good County-wide correlation with the regional recharge value for the subbasin. For this specific Site, however, both the evapotranspiration reduction method and the reduced rainfall method yield results that compare favorably with the regional value of 10.1 inches,. As a result, both values will be utilized for the nitrate loading calculation. The nitrate concentration of the recharge waters was estimated to be 1 mg/L-N (Hantzsche and Finnemore). Quantity and Quality of Domestic Wastewater Mr. Sandoval has indicated that the renovated house will have three bedrooms. Crites and Tchobanoglous (1998) list a typical flow rate of 50 to 70 gallons per person per day for an individual residence. The San Joaquin County Enviromental Health Department has indicated that maximum flow and double occupancy within each bedroom should be considered for the nitrate loading assessment; as a result, a value LOGE 1906 Page 12