Laserfiche WebLink
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 5. Assumptions for Nitrate Loading Calculation <br />Variable Value Units Description <br />Q 276.2 gpd Effluent flow rate <br />Nw 85 rng/L-N Effluent stream concentration <br />A 16.82 acres Site area <br />Nb 0.17 mg/L-N Concentration of rain <br />d 0.25 constant Denitrification factor <br />R 6.24 inches per year Recharge rate of rainfall <br />W 0.2 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 6. Result of Nitrate Loading Calculation <br />Variable Value Units Description <br />Nc 2.3 mg/L-N Long-term average concentration of percolating effluent <br />The US EPA recommended MCL for nitrate in drinking water is 10 mg/L-N. In a worst- <br />case situation, the maximum buildup of nitrates in the aquifer from the use of septic <br />systems on the Site is predicted to be 2.3 mg/L-N. <br />LOGE 20-33 Page 14