Laserfiche WebLink
content, moist soil conditions, high pH, and organic material denitrify by about 35 <br /> 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 clay <br /> content of the subsurface soil present at 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 16. <br /> Table 3. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 700 gpd Effluent flow rate <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 3.49 acres Site area <br /> Nb 0.3 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 3.64 inches per year Recharge rate of rainfall <br /> W 2.7 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 4. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Nc 9.9 mg/L-N Long-term average concentration of percolating effluent <br /> LOGE 1945 Page 11 <br />