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Table 3. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 700 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 1.00 acres Site area <br /> Nb 0.3 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 5.54 inches per year Recharge rate of rainfall, scenario 2 <br /> W 9.4 inches per year Uniform waste water loading (calculated) <br /> The details of the nitrate loading calculation are included in Plate 16. The results of the <br /> calculation are presented in the following table. <br /> Table 4. Results of Nitrate Loading Calculations <br /> Variable Value Units Description <br /> Nc 14.4 mg/L-N Long-term average concentration of percolating <br /> effluent <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 in the aquifer from the use of septic <br /> systems on the Site is predicted to be 14.4 mg/L-N. <br /> The result of the nitrate loading estimate exceeds the maximum drinking water <br /> 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 proposed development on the Site has the potential to cause <br /> a buildup of nitrates in the aquifer above 10 mg/L-N. <br /> LOGE 20-01 Page 12 <br />