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Worksheet No. 2 <br /> Nitrate Mass Balance Calculation <br /> of Effluent <br /> Data Input: <br /> Site Area (A): 1 Acre <br /> Effluent Quantity (Q):85 gals/day Concentration Rain (N): 0.17 mg/L-N <br /> Effluent Stream (N,): 59.20 mg/L-N Denitrification (d):25.0% <br /> Waste Loading (W): 1.14 in/yr Deep Perc. of Rain (R): 7.86 in <br /> Result: <br /> Mass Balance (N): 5.78 mg/L-N <br /> MCLDrinking Water: 10. mg/L-N <br /> Percent of MCL: 58% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft' x 365 day x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,566 ft 1 ft (A) <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 (5.78 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) <br /> W is 150 gallons per day on a 1 acre site (1.14 in/yr). <br /> Nw= Total nitrate-N concentration of waste water percolate (59.2 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 59.2 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 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 /> pEIts <br /> OL <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> COTE 6INCAL SERNCES-EN(31N EERNGIABORATORIES Z . <br /> 22 Vi—t—L..Lodi.CA 95240 O <br /> (20367-37x1 7S c n G�' <br /> PLATE 10 <br />