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Table 3. Assumptions for Nitrate Loading Calculation <br />Variable Value Units Description <br />420 gpd Effluent flow rate <br />Nw 35 mg/L-N Effluent stream concentration <br />A 10.0 acres Site area <br />Nb 1.00 mg/L-N Concentration of rain <br />0.25 constant Denitrification factor <br />3.64 inches per year Recharge rate of rainfall <br />0.6 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. Result of Nitrate Loading Calculation <br />Variable Valtie— Units Description <br />Nc 4.4 mg/L-N Long-term average concentration of percolating effluent <br />The U$ EP ecommended 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 4.4 mg/L-N. The result of the nitrate loading <br />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 not <br />cause a buildup of nitrates in the aquifer above 10 mg/L-N. <br />LOGE 1924 <br /> Page 11