Laserfiche WebLink
LOGE 1848: Ford Construction SSNLS Addendum Page 3 <br /> May 6, 2019 <br /> currently being developed by the San Joaquin County Environmental Health Department for use <br /> in future studies. Details of the calculation are presented in Plates 3 and 4. <br /> Table 1. Inputs and Results for Nitrate Loading Calculation, <br /> Scenario 1 (Current Predicted Employees) <br /> Variable Value Units Description <br /> Q 66.8 gpd Effluent flow rate <br /> Nw 85 mg/L-N Effluent stream concentration <br /> A 25.12 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> R 8.16 inches per year Recharge rate of rainfall <br /> W 0.0 inches per year Uniform waste water loading (calculated) <br /> Nc 1.3 mg/L-N Long-term average concentration of percolating <br /> effluent <br /> Table 2. Inputs and Results for Nitrate Loading Calculation, <br /> Scenario 2 (Potential Future Employees) <br /> Variable Value Units Description <br /> Q 1,300 gpd Effluent flow rate <br /> Nw 85 mg/L-N Effluent stream concentration <br /> A 25.12 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> R 8.16 inches per year Recharge rate of rainfall <br /> W 0.7 inches per year Uniform waste water loading (calculated) <br /> Nc 5.9 mg/L-N Long-term average concentration of percolating <br /> effluent <br /> For this Site, the long-term average concentration of percolating effluent is found to be 1.3 <br /> mg/L-N for six employees, or 5.9 mg/L for 100 employees, when calculated as shown. In either <br /> case, the value is below the US EPA recommended MCL for nitrate in drinking water of 10 <br /> mg/L-N. <br />