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• Table 6-3. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 1,106.4 gpd Effluent flow rate <br /> Nw 40.7 mg/L-N Effluent stream concentration <br /> A 21.7 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> R 13.70 inches per year Deep percolation of rain water <br /> W 0.69 inches per year Uniform waste water loading (calculated) <br /> The details of the nitrate loading calculation are included in Plate 6-1. The results <br /> of the calculation are presented in the following table. <br /> Table 6-4. Result of Nitrate Loading Calculation <br /> • Variable Value Units Description <br /> Nc 2.4 mg/L-N Long-term average concentration of percolating 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 in the aquifer from the use <br /> of septic systems on the Site is predicted to be 2.4 mg/L-N. The result of the <br /> nitrate loading estimate is well below the maximum drinking water standard. <br /> Discussion of Nitrate Loading Results <br /> Total Nitrate Impact <br /> Based on the method and assumptions described, the result of the nitrate loading <br /> estimate indicates that the existing and proposed development on the Site should <br /> not cause a buildup of nitrates in the aquifer above 10 mg/L-N. Because of the <br /> satisfactory result, no mitigation measures are recommended. <br /> • LOGE 1820 Page 6-4 <br />