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Table 3. Assumptions for Nitrate Loading Calculation, Parcel 2 <br /> Variable Value Units Description <br /> Q 560 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 2.55 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 8.16 year Deep percolation of rain water <br /> inches per <br /> W 3.0 year Uniform waste water loading (calculated) <br /> Nitrate Loading Results <br /> The results of the calculations for Parcels 1 and 2 are presented in the following table. <br /> Table 4. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Nc, Long-term average concentration of percolating <br /> Parcel 1 4.0 mg/L-N effluent, Parcel 1 <br /> Nc, Long-term average concentration of percolating <br /> Parcel 2 6.8 mg/L-N effluent, Parcel 2 <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 on-site septic systems is predicted to be 4.0 mg/L-N for Parcel 1 <br /> and 6.8 mg/L for Parcel 2. <br /> LOGE 1916 Page 10 <br />