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R C) <br /> Table 6. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units <br /> Description <br /> Q 697.65 gpd Effluent flow rate <br /> Nw 50.6 mg/L-N Effluent stream concentration <br /> A 18.24 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.15 constant Denitrification factor <br /> inches per <br /> R 6.57 year Deep percolation of rain water <br /> inches per <br /> W 0.51 year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in Plate 10. The results of the <br /> calculation are presented in the following table. <br /> Table 7. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 4.05 mg/L-N effluent <br /> The US EPA recommen for nitrate in drinking water is 10 mg/L-N. 1n a worst <br /> case situation, the ma um bui dup f nitrates from the use of septic systems in the <br /> aquifer is predicted to 4.05 mg/L-N. The result of the nitrate loading estimate is well <br /> below the maximum drin ' waters ndard. <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 residences and proposed <br /> development on the Site should not cause a buildup of nitrates in the aquifer above 10 <br /> mg/L-N. Because of the satisfactory result, no mitigation measures are warranted. <br /> LOGE1003 Page 13 <br />