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Nitrate Mass Balance Calculation: <br /> 70 Acre Parcel <br /> Data Input: <br /> Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Quantity(Q): 490 gals/day Denitrification (d): 10.0% <br /> Effluent Stream (N,N): 45 mg/L-N Deep Perc.of Rain (R): 5.01 in/yr <br /> Site Area(A): 69.8 Acres Waste Loading (W): 0.09 in/yr <br /> Result: <br /> Mass Balance (NG): 1.7 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 17%G <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 qal 1 year 43,560 ft2 1 ft (A) <br /> 0.09 in/yr(site) =490 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/69.8 acres) <br /> Nc= WNw(1-d)+RN,, Hantzsche-Fennemore Equation (Nc) <br /> W+R <br /> 1.73 mg/L-N=((0.09 in/yr x 45 mg/L-N x(1-0.1))+(5.01 in/yr x 1mg1L-N))/(0.09 in/yr+5.01 in/yr) <br /> Variables: <br /> Nc =Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(1.73 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (0.09 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 (5.01 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 45 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 10%. <br /> 3. Estimated deep percolation of rainfall is 5.01 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> 00 \ <br /> NEIL O.ANDERSON 81 ASSOC.,INC. <br /> GEOn—CALSER—ES-ENGINEERNG LABORATORIES <br /> M Hou slop L1.L1d1.CA 9521(Zm)mI-nm <br /> Plate 10 <br />