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Table 5. Assumptions for Nitrate Loading Calculations <br />Variable Value Units Description <br />Q 117.2 gpd Effluent flow rate <br />Nw <br />85 <br />mg/L-N <br />Effluent stream concentration <br />A <br />4.81 <br />acres <br />Site area <br />Nb <br />0.136 <br />mg/L-N <br />Concentration of rain <br />d <br />0.25 <br />constant <br />Denitrification factor <br />R <br />5.74 <br />inches per year <br />Recharge rate of rainfall <br />W <br />0.3 <br />inches per year <br />Uniform waste water loading (calculated) <br />The details of the nitrate loading calculations are included in Plate 14. The result of the <br />calculation is presented in the following table. <br />Table 6. Results of Nitrate Loading Calculations <br />Variable Value Units Description <br />Nc 3.6 mg/L-N Long-term average concentration of percolating effluent <br />Based on the methods and assumptions described, the use of the existing septic <br />system on the Site and maximum scenario of 25 truckers (only 5 to 10 are anticipated) <br />yields a calculated buildup of nitrates in the aquifer up to 3.6 mg/L-N. The US EPA <br />recommended MCL for nitrate in drinking water is 10 mg/L-N. The result of the nitrate <br />loading calculation is well below the maximum drinking water standard. <br />Discussion of Nitrate Loadina 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 potential future development on the Site will not <br />cause a buildup of nitrate in the aquifer over the MCL. No nitrate mitigation is <br />recommended at this time. <br />LOGE 2236 Page 13 <br />