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Table 2 -Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Q 3,675 gpd Sewage effluent flow rate <br /> Nw 70 mg/L-N Effluent nitrogen concentration <br /> A 46.42 acres Watershed area <br /> Nb 1.0 mg/L-N Concentration of rain <br /> d 25% unitless Denitrification factor <br /> R 6.45 inches per year Deep percolation of rain water <br /> W 1.06 inches per year Uniform waste water loading for calculation <br /> The results of the nitrate loading,or long term average concentration of percolating effluent Nc,as <br /> calculated using the Hantzsche and Finnemore equation,are presented in Table 3. <br /> Table 3- Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Nc 8.29 mg/L-N Long-term average concentration of percolating <br /> Conclusion <br /> The US EPA Primary Drinking Water Standards set the maximum contaminant level (MCL)for nitrate in <br /> drinking water at 10 mg/L as nitrogen (45 mg/I NO). According to the calculations based on the <br /> Hantzsche and Finnemore equation, increases'in nitrate concentrations due to the proposed project are <br /> projected to be approximately 8.29 mg/L as N. As this is lower than the EPA MCL for drinking water,the <br /> project nitrate loading concentrations do not exceed the maximum drinking water standard. <br /> 71 Page <br />