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Nitrate Loading Estimates <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 5. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 1,547.5 gpd Effluent flow rate <br /> Nw 85 mg/L-N Effluent stream concentration <br /> A 4.1 acres Site area <br /> Nb 0.136 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 2.67 inches per year Recharge rate of rainfall <br /> W 5.1 inches per year Uniform waste water loading (calculated) <br /> The details of the nitrate loading calculation are included in Plate 14. The result of the <br /> calculation is presented in the following table. <br /> Table 6. Result of Nitrate Loading Calculations <br /> Variable Value Units Description <br /> Nc 36.2 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 situation, the maximum buildup of nitrates in the aquifer from the use of a septic <br /> system at the proposed project on the Site is predicted to be 36.2 mg/L-N. <br /> LOGE 2240 Page 14 <br />