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Table 9. Assumptions for Nitrate Loading Calculation (Full Occupancy) <br /> Variable Value Units Description <br /> Q 2,800.68 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 138 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 9.22 year Deep percolation of rain water <br /> inches per <br /> W 0.27 year Uniform waste water loading for calculation <br /> The results of the nitrate loading calculations for both scenarios are presented in the • <br /> following table: <br /> Table 10. Result of Nitrate Loading Calculations <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 1.13 mg/L-N effluent (typical use) <br /> Long-term average concentration of percolating <br /> Nc 1.63 mg/L-N effluent (full occupancy) <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 1.13 mg/L-N for the typical use, and 1.63 mg/L-N for full <br /> occupancy of the Site. The results of the nitrate loading estimate in either case are well <br /> below the maximum drinking water standard. <br /> LOGE 1708 Page 16 • <br />