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Worksheet No. 2 Y <br /> Nitrate Mass Balance Calculation <br /> of Effluent <br /> Data Input <br /> Persons: 11 persons Site Acreage (A): 0.57 A <br /> Use: 5 gals/day/person Concentration Rain N: 0.17 mg/L-N <br /> Effluent Quantity: 55 gals/day Denitrification: 25.0% <br /> Effluent Stream N: 45.00 mg/L-N Deep Percolation of Rain: 7.86 in <br /> Waste Loading (W): 1.30 in/yr <br /> Result <br /> Mass Balance (Nc): 4.93 mg/L-N <br /> MCI-Drinking Water: 10. mg/L-N <br /> Percent of MCL: 49% <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 (4.93 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) <br /> W is 11 people using 5 gallons per day on a 0.57 acre site (1.3 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 (25%). <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 25%. <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 by <br /> Hantzsche and Fennemore, 1991. <br /> pERSO� <br /> NEIL O.ANDERSON&ASSOC.,INC. s <br /> CEoTECHNCAL SERVICES-ENGIN EERNG LABORATORIES Z Yr <br /> 22 Ho wtm Ln Lodi.CA 95240O ~ <br /> (209)387-3701 7 S S O L`' <br />