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Nitrate Loading Estimate <br />A nitrate loading scenario was employed to determine the impact from the proposed <br />project to ground water. The scenario utilizes the variables discussed previously, which <br />represent the estimated conditions and uses associated with this project. The following <br />table presents a summary of the assumptions for the nitrate loading calculation for the <br />Site, as presented in Plate 14. <br />Table 4. Assumptions for Nitrate Loading Calculation <br />Variable <br />Value <br />Units <br />Description <br />Q <br />700 <br />gpd <br />Effluent flow rate <br />Nw <br />35 <br />mg/L-N <br />Effluent stream concentration <br />A <br />5.00 <br />acres <br />Site area <br />Nb <br />0.17 <br />mg/L-N <br />Concentration of rain <br />d <br />0.35 <br />constant <br />Denitrification factor <br />R <br />6.24 <br />inches per year <br />Recharge rate of rainfall <br />W 1.9 inches per year Uniform waste water loading (calculated) <br />The details of the nitrate loading calculation are included in Plate 14. The results of the <br />calculation are presented in the following table. <br />Table 5. Result of Nitrate Loading Calculation <br />Variable Value Units Description <br />Nc 5.4 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 worst- <br />case scenario, the maximum buildup of nitrates in the aquifer from the use of septic <br />systems on the Site is predicted to be 5.4 mg/L-N. The result of the nitrate loading <br />estimate is well below the maximum drinking water standard. <br />LOGE 2147 Page 13 <br />