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• percent, and soils with high sand content and fast percolation rates tend to denitrify at a <br /> lower rate of about 10 percent. <br /> A typical denitrification factor of 25 percent was selected for the Site because of the <br /> fine-grained nature of the shallow soil at the percolation test location. <br /> 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 11. <br /> Table 5. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 158 gpd Effluent flow rate <br /> Nw 85.0 mg/L-N Effluent stream concentration <br /> A 6.97 acres Site area <br /> • Nb 1.00 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> R 4.37 inches per year Deep percolation of rain water <br /> W 0.30 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 /> Table 6. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Nc 5.09 mg/L-N Long-term average concentration of percolating effluent <br /> • LOGE 1628 Page 11 <br />