Laserfiche WebLink
• Nitrate Loading Estimate -- Existing Facilities Only <br /> A second nitrate loading scenario was employed to address only the existing facilities <br /> on the Site. The scenario utilizes the variables discussed previously, which represent <br /> the estimated conditions and uses associated with this project. The following table <br /> presents a summary of the assumptions for the nitrate loading calculation for the Site, <br /> as presented in Plate 12. <br /> Table 10. Assumptions for Nitrate Loading Calculation (Existing Facilities Only) <br /> Variable Value Units Description <br /> Q 1,491.7 gpd Effluent flow rate <br /> Nw 72.8 mg/L-N Effluent stream concentration <br /> A 3.61 acres Site area <br /> Nb 1.00 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 13.7 inches per year Deep percolation of rain water <br /> • W 5.55 inches per year Uniform waste water loading for calculation <br /> The details of the nitrate loading calculation are included in Plate 12. The results of the <br /> calculation are presented in the following table. <br /> Table 11. Result of Nitrate Loading Calculation (E Isting Facilities Onl ) <br /> Variable Value Units Description <br /> Nc 14.4 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 nitratequifer from the use of existing <br /> septic systems on the Site is predicted to 14.4 m L-N. The result of the nitrate <br /> loading estimate exceeds the maximum drin w standard. <br /> • LOGE 1711 Page 16 <br />