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Nitrate Mass Balance Calculation <br /> Data Input: <br /> Waste Loading(W): t4j ifZ5-Elr�, <br /> Site Area(A). �1!;, <br /> Effluent Quantity(Q): 85 Gals Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Stream(Nw): 45.00 mg/L-N Denitrification(d): 25% <br /> Deep Perc.of Rain(R): 6.84 inches <br /> Result: <br /> _ Mass Balance(Nc): 1.02 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N 10% <br /> Equations: <br /> From Table 4 in Report 85 Gals Find Effluent Quantity(Q) <br /> (W) in = (Q) gal x 1 ft? x 365 day x 1 acre z 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 It' 1 It (A)acre <br /> 0.004 in/yr(site)=85 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site 1306.75 acres) <br /> N,= WN-0-d)+RN„ Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 1.02 mg/L-N=((0 in/yr x 45 mg/L-N x(1-0.25))+(6.84 in/yr x l mg/L-N))/(0 in/yr+6.64 in/yr) <br /> _ Variables: <br /> Nc=Average nitrate-N concentration(mg/I)of combined effluent and rainfall percolate(1.02 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(0 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(25%). <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 25%. <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 /> s�Os <br /> NEIL O.ANDERSON&ASSOC.,INC. A 1 <br /> a°xaxcr ve,wae.eaw�s�wewowmwp s I <br /> Plate 9 <br />