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Nitrate Mass Balance Calculation <br /> Input: <br /> From Table 2(Q): 560 gpd <br /> Total Nitrogen Con.-Effluent Stream(Nw): 45.00 mg/L-N <br /> Site Area(A): 35.41 Acre <br /> Concentration Rain(Nb): 1.00 mgA.-N <br /> Denitrification(d): 35% <br /> Deep Pere.of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 1.85 mg(L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mgrL-N <br /> Percent of MCL Nitrate as N: 19% <br /> Waste Loading(W): 0.21 i"r <br /> Equations: <br /> r (W) in = (Q) gal x 1 ft' x 365 day x 1 ave x 12 in x 1 Find <br /> yr day 7.48 Dal 1 vear 43,560 fh 1 it (A)ave <br /> 0.21 in/yr/site=560 gal/day x(1 cu-k/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site 135.41 acres) <br /> Nc= WN_It-d)+RN. Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 1.85 mgA.-N=((0.21 in/yr x 45 mg1L-N x(1-0.35))+(6.84 in/yr x 1mg1L-N))/(0.21 iW+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(1.85 mg/L-N). <br /> W=uniform waste water loading for study area(in/yr)(0.21 inches/year). <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(35%). <br /> R=uniform deep percolation of rainfall(6.84 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall(1 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,1992. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> Assumption based on work from Hantzsche and Finnemore,1992. <br /> 3. Estimated deep percolation of rainfall is 6.84 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1992. <br /> r <br /> oe�r <br /> NEIL O.ANDERSON 6 ASSOC.,INC. nt <br /> Plate 10 <br />