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Nitrate Mass Balance Calculation, Parcel 1 <br /> Data Input: <br /> Effluent Quantity(Q): 518 gals/day Concentration Rain (Nb): 1.00 mg/L-N V <br /> Effluent Stream (N,): 77.30 mg/L-N Denitrification (d): 20.0% <br /> Site Area (A): 22.02 Acres j Deep Perc. of Rain (R): 5.76 in/yr <br /> Waste Loading (W): 0.32 in/yr <br /> Result: <br /> Mass Balance(N j: 4.1 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 42% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find W <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A)acre <br /> 0.32 in/yr(site)=518 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/22.02 acres) <br /> N�= WNw(1-d)+RN,, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 4.17 mg/L-N=((0:32 in/yr x 77.3 mg/L-N x(1-0.2))+(5.76 in/yr x 1mg/L-N))/(0.32 in/yr+5.76 in/yr) <br /> Variables: <br /> Nc = Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate (4.17 mg/L-N). <br /> W = Uniform waste water loading for study area (in/yr) (0.32 inches/year). <br /> Nw =Total nitrate-N concentration of waste water percolate(77.3 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (20%). <br /> R = Uniform deep percolation of rainfall (5.76 in/yr). <br /> Nb = Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 77.3 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 20%. <br /> 3. Estimated deep percolation of rainfall is 5.76 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> '-44NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate 10 <br />