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• Table 4. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 2,880 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 4.04 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.30 constant Denitrification factor <br /> inches per <br /> R 1.67 year Deep percolation of rain water <br /> inches per <br /> W 9.58 year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in Plate 11. The results of the <br /> calculation are presented in the following table. <br /> Table 5. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 21.01 mg/L-N effluent <br /> I <br /> The US EPA.-recommended MCL for nitrate in drinking water is 10 mg/L-N. In a worst- <br /> case situation, the maximum buildup of nitrates from the use of septic systems in the <br /> aquifer is predicted to be 21.01 mg/L-N. The result of the nitrate loading estimate <br /> exceeds the maximum drinking water standard. <br /> • LOGE 1623 Page 10 <br />