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Nitrate Mass Balance Calculation <br /> (45.63-Acre Parcel) <br /> Data Input: <br /> Waste Loading(W): 0.15 in/yr <br /> Site Area(A): 45.63 Acre <br /> Effluent Quantity(Q): 525 Gals Concentration Rain(Nb): 0.17 mg/L-N <br /> Effluent Stream(Nw): 45.00 mg/L-N Denitrification(d): 10% <br /> Deep Perc of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 1.06 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N 11% <br /> Equations: <br /> From Table 7 in Report 525 Gals Find Effluent Quantity(Q) <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> Yr day 7.48 qal 1 year 43,560 ft2 1 ft (A) <br /> 0.15 in/yr(site) =525 gal/day x(1 cu-/f/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1(t)x(1 site/45.63 acres) <br /> Nc= WN-(1-d)+RN,, Hantzsche-Fennemore Equation(NO <br /> W+R <br /> 1.06 mg/L-N=((0.15 in/yr x 45 mg/L-N x(1-0.1))+(6.84 in/yr x 0.17mg1L-N))/(0.15 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(1 06 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(0.15 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(10%). <br /> R=Uniform deep percolation of rainfall(6 84 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, 1992. <br /> 2 Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 10% <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 0.17 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1992. <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> s <br /> .to�o.wcK sa+Ho<seciHEaallo L-rowes Iz <br /> R®1 E'lDot T \0/ <br /> S`O� <br /> Plate 10 <br />