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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 hardpan and sand strata observed by Armstrong at <br /> 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 15. <br /> Table 3. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 980 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 3.18 acres Site area <br /> Nb 0.3 mg/L-N Concentration of rain <br /> d 0.25 constant Denitrification factor <br /> R 12.60 inches per year Recharge rate of rainfall <br /> W 4.1 inches per year Uniform waste water loading (calculated) <br /> The details of the nitrate loading calculation are included in Plate 15. The results of the <br /> calculation are presented in the following table. <br /> Table 4. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Nc 6.7 mg/L-N Long-term average concentration of percolating effluent <br /> LOGE 1931 Page 11 <br />