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Soil Suitability/ Nitrate Loading Study -Addendum Irerracon <br /> Buddhist Temple—Thornton Road ■ Stockton, CA <br /> October 19, 2020 ■ Terracon Project No. NA177056 <br /> Effluent Concentrations (Nw) -Weighted Average <br /> Commercial Residential <br /> 50 gpd x 85 mg/L-N/ 1,000 gpd =4.25 mg/L-N 950 gpd x 45 mg/L-N/ 1,000 gpd =42.75 mg/L-N <br /> 4.25 mg/L-N +42.75 mg/L-N = 47 mg/L-N <br /> For the 2019 SSNLS, three nitrate loading calculations were performed for the two existing <br /> systems (No. 1 & No. 2) and one proposed system (No. 3). The nitrate loading balances were <br /> added together to determine the estimated nitrate levels between 21.4 mg/L-N if one person is <br /> calculated per bedroom or 33.3 mg/L-N if two people are calculated per bedroom. As per the <br /> EHD recommendation, Terracon performed one nitrate loading calculation for the parcel rather <br /> than three separate calculations for each system. The following table presents a summary of the <br /> revised nitrate loading calculation for the site based on the revised long term average daily flow <br /> rates, weighted average for the effluent concentration, and revised net rainfall recharge. <br /> Summary of Nitrate Mass Balance Equation - Revised <br /> Result Average Effluent Leach Field Net Rainfall <br /> Year (Nc)" Acres Daily Concentration(mg/L- (A) Effluent (Nw) Denitrification Recharge(R) <br /> N) (Q)(gpd) (mg/L-N) (d) (in/year) <br /> Septic System <br /> No.1 <br /> Existing 5 --- 4.60 300 45 30 9.05 <br /> Bedroom <br /> Residence <br /> Septic System <br /> No.2 <br /> Assembly Hall <br /> Daily Visitors <br /> 7 Full Moon Events <br /> 2020 April—New Year ___ 4.60 50 85 30 9.05 <br /> Event <br /> 5 Full Moon Events <br /> (July,August, <br /> October, <br /> November, <br /> December) <br /> Septic System <br /> No.3 <br /> Proposed 12 --- 4.60 650 45 30 9.05 <br /> Bedroom <br /> Dormitory <br /> Total 8.8 4.60 1,000 47 30 9.05 <br /> *Maximum contaminant level(MCL)for nitrate in drinking water is 10 mg/L-N. <br /> Responsive ■ Resourceful ■ Reliable 3 <br />