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percent, and soils with high sand content tend to denitrify at a lower rate of about 10 <br /> percent. <br /> A denitrification factor of 35 percent was selected for the Site because of the clayey soil <br /> present at the percolation test location. <br /> Nitrate Loading Estimate <br /> A nitrate loading scenario was employed to determine the impact from the existing and <br /> proposed development to 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 summarizes the assumptions for the nitrate loading <br /> calculation for the Site, as presented in Plate 17. <br /> Table 4. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 350 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 0.6 acres Area <br /> Nb 0.103 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 6.37 inches per year Recharge rate of rainfall <br /> W 7.8 inches per year Uniform wastewater loading, calculated <br /> The details of the nitrate loading calculation are included in Plate 17. The result of the <br /> calculation is presented in the following table. <br /> Table 5. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Nc 12.6 mg/L-N Long-term average concentration of percolating effluent <br /> LOGE 2620 Page 12 <br />