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Table 4. Assumptions for Nitrate Loading Calculations <br />Variable <br />Value <br />Units <br />Description <br />Q <br />400 <br />gpd <br />Effluent flow rate <br />Nw <br />35 <br />mg/L-N <br />Effluent stream concentration <br />A (1) <br />2.27 <br />acres <br />Site area, Parcel 1 <br />A (2) <br />2.58 <br />acres <br />Site area, Parcel 2 <br />Nb <br />0.136 <br />mg/L-N <br />Concentration of rain <br />d <br />0.35 <br />constant <br />Denitrification factor <br />R <br />3.21 <br />inches per year <br />Recharge rate of rainfall <br />W (1) <br />2.4 <br />inches per year <br />Uniform waste water loading (calculated), Parcel 1 <br />W (2) <br />2.1 <br />inches per year <br />Uniform waste water loading (calculated), Parcel 2 <br />The details of the nitrate loading calculations are included in Plates 15 and 16. The <br />results of the calculations are presented in the following table. <br />Table 5. Result of Nitrate Loading Calculation <br />Variable Value Units Description <br />Nc (1) 9.7 mg/L-N Long-term average concentration of percolating effluent, <br />Parcel 1 <br />Nc (2) 9.0 mg/L-N Long-term average concentration of percolating effluent, <br />Parcel 2 <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 9.7 mg/L-N for Parcel 1 and 9.0 mg/L-N for Parcel <br />2. The result of the nitrate loading estimate for each parcel is less than the maximum <br />drinking water standard. <br />LOGE 2208 Page 12 <br />