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ql4itrate Mass Balance Calculation <br /> Parcel 14 <br /> tj <br /> Data Input: <br /> Effluent Quantity(Q): 560 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,N): 45.00 mg/L-N Denitrification (d): 15.0% <br /> Site Area(A): 9.81 Acres Deep Perc. of Rain (R): 3.54 in/yr <br /> Waste Loading (W): 0.77 in/yr <br /> Result: <br /> Mass Balance(Nj: 7.6 mg/L-N <br /> MCL Drinking Water Nitrate as N: 90.0 mg/L-N <br /> Percent of MGL Nitrate as N 76% <br /> Equations: <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 gal 1 year 43,560 ft2 1 ft (A)acre <br /> 0.77 in/yr(site) =560 gal/day x(9 cu-ft/7.48 gals)x(365 days/1 year)x(9 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/9.81 acres) <br /> Fj' <br /> N,= WN,,,,(1-d)+RN,, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 7.64 mg/L-N=((0.77 in/yr x 45 mg/L-N x(1-0.15))+(3.54 in/yr x 1 mg/L-N))/(0.77 in/yr+3.54 in/yr) <br /> Variables: <br /> � Nc=Average nitrate-N concentration (m /I)of combined effluent and rainfall percolate(7.64 m /L-N). <br /> W= Uniform waste water loading for study area(in/yr) (0.77 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 (15%). <br /> R= Uniform deep percolation of rainfall(3.54 in/yr). <br /> t 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 45 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 15%. <br /> 3. Estimated deep percolation of rainfall is 3.54 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> �I <br /> NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate, 16 <br />