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I <br /> n' <br /> 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 denitrification factor of 15 percent was selected for the Site because of the moderately <br /> fine-grained nature of the soils. <br /> Nitrate Loading Estimate <br /> A nitrate loading scenario was employed to determine the impact from the proposed <br /> project. The scenario utilizes the variables discussed previously, which represent the <br /> estimated conditions and uses associated with this project. The following table presents <br /> a summa of the assumptions for the nitrate loading calculation for the Site as <br /> summary P 9 , <br /> presented in Plate 9. <br /> Table 7. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 623.2gP d Effluent flow rate <br /> Nw 46.50 mg/L-N Effluent stream concentration <br /> A 16.00 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.15 constant Denitrification factor <br /> R 6.57 inches per year Deep percolation of rain water <br /> W 0.52 inches per year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in Plate 9. The results of the <br /> calculation are presented in the following table. <br /> Table 8. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 3.84 g/L-N effluent <br /> ` LOGE0911 Page 12 <br />