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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 standard denitrification factor of 25 percent (Hantzsche and Finnemore, 1992) was <br /> selected for the Site because of the silt content of the soil present at the percolation test <br /> location. <br /> Nitrate Loading Estimate <br /> Nitrate loading calculations were employed to determine the impact from the proposed <br /> project to ground water. The calculations utilize the variables discussed previously, <br /> which represent the estimated conditions and uses associated with this project. The <br /> following table presents a summary of the assumptions for the nitrate loading <br /> calculation for the Site, as presented in Plate 16. <br /> Table 5. Assumptions of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 721.1 gpd Effluent flow rate <br /> Nw 46.0 mg/L-N Effluent stream concentration <br /> A 14.0 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> R 3.12 inches per year Recharge rate of rainfall <br /> W 0.7 inches per year Uniform waste water loading (calculated) <br /> The details of the nitrate loading calculation are included in Plate 16. 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 7.1 mg/L-N Long-term average concentration of percolating effluent <br /> LOGE 1908 Page 13 <br />