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Nitrate Loading Estimate—Existing and Proposed Facilities <br /> A nitrate loading scenario was employed to estimate the impact from the existing and <br /> proposed facilities to the ground water. The scenario utilizes the variables discussed <br /> previously, which represent the estimated conditions and uses associated with this <br /> project. The following table presents a summary of the assumptions for the nitrate <br /> loading calculation for the Site, as presented in Plate 11. <br /> Table 8. Assumptions for Nitrate Loading Calculation <br /> (Existing and Proposed Facilities) <br /> Variable Value Units Description <br /> Q 1,564.5 i/ gpd Effluent flow rate <br /> Nw 73.4 t/ mg/L-N Effluent stream concentration <br /> A 3.61 ✓ acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.35 1/ constant Denitrification factor <br /> • R 13.7 inches per year Deep percolation of rain water <br /> W 5.83 inches per year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in Plate 11. The results of the <br /> calculation are presented in the following table. <br /> TablResult of Nitrate Loading Iculation <br /> ( (Existing and Proposed Facilitie ) <br /> Variable Value Units ��_ Des�ripii <br /> Nc 14.9 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 aqunater <br /> the use of existing <br /> and proposed septic systems on the Site is predicted to beL N. The result of j <br /> the nitrate loading estimate exceeds the maximum drinkingdard. <br /> • LOGE 1711 Page 15 <br />