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LOGE 1832b: De Casas NLS Addendum Page 3 <br /> April 17, 2020 <br /> attached to this report. Live Oak then averaged the concentrations of the three <br /> samples, for a value of 0.27 mg/L-N to represent the nitrate concentration of rain. <br /> Because the San Joaquin County Environmental Health Department has requested that <br /> local and recent data be utilized wherever possible, the concentration of the Lodi <br /> rainwater been selected for use in the nitrate loading calculation. <br /> Quantity of Domestic Wastewater <br /> Mr. De Casas proposes to construct a three-bedroom home on the Site. The Site is <br /> currently vacant. <br /> Based on the March 2020 method, the effluent flow rate for a three-bedroom home is <br /> calculated as 100 gallons per day (gpd) for the first bedroom and 50 gpd for each <br /> additional bedroom, for a total of 200 gpd. <br /> Other Variables <br /> The other variables utilized in the nitrate loading calculation (effluent stream <br /> concentration, site area, denitrification factor) remain unchanged from the original <br /> report. <br /> Nitrate Loading Estimate <br /> The following table presents a summary of the assumptions for, and results of, the <br /> nitrate loading calculation for the Site when the new methods are utilized. Details of the <br /> calculation are presented in the attached Plate 3. <br /> Table 1. Inputs and Results for Nitrate Loading Calculation, <br /> Recharge Derived from Evapotranspiration Reduction Method <br /> Variable Value Units Description <br /> Q 200 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 0.31 acres Site area <br /> Nb 0.27 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 7.91 inches per year Recharge rate of rainfall <br /> W 8.7 inches per year Uniform waste water loading (calculated) <br /> Nc 12.0 mg/L-N Long-term average concentration of percolating effluent <br />