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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 /> The soil on the Site was found to be sandy clay. A denitrification factor of 35 percent <br /> was selected for the Site because of the clay content of the soil near the proposed new <br /> residence. <br /> Nitrate Loading Estimate <br /> A nitrate loading scenario was employed to determine the impact from the project to <br /> ground water. The scenario utilizes the variables discussed previously, which represent <br /> the estimated conditions and uses associated with this project. The following table <br /> presents a summary of the assumptions for the nitrate loading calculation for the Site, <br /> as presented in Plate 11. <br /> Table 2. 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 2.00 acres Site area <br /> Nb 0.30 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> inches per <br /> R 11.78 year Deep percolation of rain water <br /> inches per <br /> W 2.4 year Uniform waste water loading (calculated) <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 3. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Long-term average concentration of percolating <br /> Nc 4.0 mg/L-N effluent <br /> LOGE 20-32 Page 8 <br />