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Worksheet No. 2 <br /> Nitrate Mass Balance Calculation <br /> Data Input: <br /> Site Area (A): 32.4 Acres <br /> Effluent Quantity (Q): 1,137 gals/day Concentration Rain (Nb): 0.17 mg/L-N <br /> Effluent Stream (N,.,): 45.90 mg/L-N Denitrification (d): 20.0% <br /> Waste Loading (W): 0.47 in/yr Deep Perc. of Rain (R): 7.86 in <br /> Result: <br /> Mass Balance (N,): 2.24 mg/L-N <br /> MCI-Drinking Water: 10. mg/L-N <br /> Percent of MCL: 22% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acres <br /> N� = WN-(1-d)+RN,, <br /> W+R <br /> Variables: <br /> Nc= Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (2.24 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) <br /> W is 150 gallons per day on a 32.4 acre site (0.47 in/yr). <br /> Nw = Total nitrate-N concentration of waste water percolate (45.9 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (20%). <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 45.9 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 20%. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 3. Estimated deep percolation of rainfall is 7.86 in/yr, 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 /> �pE 9S0 <br /> NEIL O.ANDERSON 3 ASSOC.,INC. > <br /> G~ <br /> w <br /> (£OlE O1NGL 5ENNa_5-EN31NffANGUO.CA ES Z <br /> IINounantn.Loti.CP MWO A <br /> PLATE 10 <br />