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• Table 2. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 560 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 1.65 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> inches per <br /> R 11.5 year Deep percolation of rain water <br /> inches per <br /> W 4.6 year Uniform waste water loading (calculated) <br /> The details of the nitrate loading calculation are included in Plate 8. The results of the <br /> calculation are presented in the following table. <br /> • Table 3. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 7.2 mg/L-N effluent <br /> The US EPA recommended Maximum Contaminant Level (MCL) for nitrate in drinking <br /> water is 10 mg/L-N. In a worst-case situation, the maximum buildup of nitrates in the <br /> aquifer from the use of an on-site septic system is predicted to be 7.2 mg/L-N. <br /> LOGE 1902 Page 8 <br />