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LOGE 1714: Delicato SS/NLS Addendum Page 7 <br /> July 18, 2017 <br /> Nitrate Loading Estimate <br /> A nitrate loading scenario was employed to determine the impact from the existing and <br /> proposed facilities to ground water. The scenario utilizes the variables discussed previously, <br /> which 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 Site, as <br /> presented in the attached plate. <br /> Table 5. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 5,871.8 gpd Effluent flow rate <br /> Nw 81.4 mg/L-N Effluent stream concentration <br /> A 137.8 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.20 constant Denitrification factor <br /> R 8.26 inches per year Deep percolation of rain water <br /> W 0.57 inches per year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in the attached plate. The results of <br /> the calculation are presented in the following table. <br /> Table 6. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 5.16 mg/L-N effluent <br /> The US EPA recommended MCL for nitrate in drinking water is 10 mg/L-N. In a worst-case <br /> situation, the maximum buildup of nitrates in the aquifer from the use of septic systems is <br /> predicted to be 5.16 mg/L-N. The result of the nitrate loading estimate is below the maximum <br /> drinking water standard. <br />