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Table 6. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 764.8 gpd Effluent flow rate <br /> Nw 47.3 mg/L-N Effluent stream concentration <br /> A 10.0 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> inches per <br /> R 6.58 year Deep percolation of rain water <br /> inches per <br /> W 1.03 year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in the attached sheet. <br /> The results of the calculation are presented in the following table. <br /> Table 7. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 5.66 mg/L-N effluent <br /> The US EPA recommended MCL for nitrate in drinking water is 10 mg/L-N. In a <br /> worst-case situation, the maximum buildup of nitrates from the use of septic <br /> systems in the aquifer is predicted to be 5.66 mg/L-N. The result of the nitrate <br /> loading estimate is below the maximum drinking water standard. <br />