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Table 1 -Assumptions for Nitrate Loading Calculation <br /> Variable Value Units Description <br /> 4 4,900 gpd Sewage effluent flow rate <br /> Nw _J0 mg/L-N Effluent nitrogen concentration <br /> A 58.03 acres Watershed area <br /> Nb 1.0 mg/L-N Concentration of rain <br /> d 12% unitless Denitrification factor <br /> R 8.25 inches per year Deep percolation of rain water <br /> W 1.42 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 2. <br /> Table 2. Result of Nitrate Loading Calculation <br /> Variable Value Units Description <br /> Nc 9.88 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 NO3). 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 9.88 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 /> 7 � <br />