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mom <br /> ' Worksheet No. 2 <br /> Nitrate Mass Balance Calculation <br /> of Effluent <br /> Data Input <br /> Persons: 50 persons Site Acreage (A): 0.57 A <br /> Use: 5 gals/daylperson Concentration Rain N: 0.17 mg/L-N <br /> t <br /> Effluent Quantity: 250 gals/day Denitrification: 15.0% <br /> Effluent Stream N: 45.00 mg/L-N Deep Percolation of Rain: 7.86 in <br /> Waste Loading (W): 5.90 in/yr <br /> Result <br /> Mass Balance (Nc): 16.49 mg/L-N <br /> MCI-Drinking Water: 10. mg/L-N <br /> Percent of MCL: 165% <br /> � Equation <br /> Nc = WNw(1 -d)+RNb <br /> W+R <br /> Variables <br /> Nc = Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (16' <br /> W = Uniform waste water loading for study area (in/yr) <br /> W is 50 people using 5 gallons per day on a 0.57 acre site (5.9 in/yr). <br /> Nw= Total nitrate-N concentration of waste water percolate (45 mg/L-N). <br /> d = Fraction of nitrate-N loss due to Denitrification in the soil (15%). <br /> R = Uniform deep percolation of rainfall (7.86 in/yr). <br /> Nb = Background nitrate-N concentration of rainfall (0.17 mg/L-N). <br /> Assumptions <br /> 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 2. Fraction of nitrate-N loss due to Denitrification in the soil is assumed to be 15%. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br />! 3. Estimated deep percolation of rainfall is 7.86, see Worksheet No. 1. <br /> 4. Assume background nitrate-N concentration of rainfall is (0.17 mg/L-N) based on range <br />! Hantzsche and Fennemore, 1991. <br />:� =pE Rpp� <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> rE°lE6RNUIL SERVICES-ENGINEERNG L420RATOFIES Z w <br /> Nou —Ln Lod.CA RWAO O ti <br /> 57 <br /> RSI 7 -301 9S5 O Lip <br /> d <br /> A <br /> i <br />