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The following table presents a summary of the assumptions for the nitrate loading <br /> calculations for the Site, as presented in Plates 15 and 16. <br /> Table 3. Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 300 gpd Effluent flow rate, with 1-bedroom 2"d unit <br /> 350 gpd Effluent flow rate, with 2-bedroom 2nd unit <br /> Nw 35 mg/L-N Effluent stream concentration <br /> A 1.00 acres Site area <br /> Nb 0.30 mg/L-N Concentration of rain <br /> d 0.35 constant Denitrification factor <br /> R 5.54 inches per year Recharge rate of rainfall <br /> W 4.0 inches per year Uniform wastewater loading (calculated), with 1-bedroom 2ftl <br /> 4.7 inches per year Uniform waste water loading (calculated), with 2-bedroom 2nd <br /> The details of the nitrate loading calculations are included in Plates 15 and 16. The <br /> results of the calculations are presented in the following table. <br /> Table 4. Results of Nitrate Loading Calculations <br /> Variable Value Units Description <br /> Nc 9.8 mg/L-N Long-term average concentration of percolating <br /> effluent, with 1-bedroom 2nd unit <br /> 10.6 mg/L-N Long-term average concentration of percolating <br /> effluent, with 2-bedroom 2nd unit <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 9.8 mg/L-N with a one-bedroom second unit <br /> dwelling, or 10.6 mg/L-N with a two-bedroom second unit dwelling. The result of the <br /> nitrate loading estimate with a one-bedroom second unit dwelling is under the maximum <br /> drinking water standard; the result slightly exceeds the standard with a two-bedroom <br /> second unit dwelling. <br /> LOGE 20-48 Page 12 <br />