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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 Loadina 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 14. <br />Table 5. Assumptions for Nitrate Loading Calculation <br />Variable <br />Value <br />Units <br />Description <br />Q <br />191.1 <br />gpd <br />Effluent flow rate <br />Nw <br />85 <br />mg/L-N <br />Effluent stream concentration <br />A <br />11.31 <br />acres <br />Site area <br />Nb <br />0.136 <br />mg/L-N <br />Concentration of rain <br />d <br />0.35 <br />constant <br />Denitrification factor <br />R <br />3.21 <br />inches per year <br />Recharge rate of rainfall <br />W <br />0.2 <br />inches per year <br />Uniform waste water loading (calculated) <br />The details of the nitrate loading calculation are included in Plate 14. 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 3.8 mg/L-N Long-term average concentration of percolating effluent <br />LOGE 2201 Page 12 <br />