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t � <br /> nilitrate Mass Balance Calculation• j <br /> Parcel 10 <br /> F i <br /> Data Input: <br /> Effluent Quantity(Q): 630 gats/day Concentration Rain (Nb): 1,00 mg/L-N <br /> Effluent Stream (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): 0.86 in/yr <br /> Result: <br /> Mass Balance(N.}: 8.3 mg/t-N <br /> -' MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 83% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> r2t yr day 7A8 gal 1 year 43,560 ftz 1 ft (A)acre <br /> 0.86 in/yr(site) =630 gat/day x(1 cu-ft/7.48 gats)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site/9.81 acres) <br /> 1 . Nv= WN,v(1-d)+RNb Hantrsche-Fennemore Equation Mc) <br /> W+R <br /> 8.3 mglL-N= ((0.86 in/yr x 45 mg/L-N x(1-0.15))+(3.54 in/yr x 1mg/L-N))/(0.86 in/yr+3.54 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(8.3 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr) (0.86 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 /> FF R= Uniform deep percolation of rainfall (3.54 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 15%. <br /> 3. Estimated deep percolation of rainfall is 3.54 in/yr, see deep percolation of rain worksheet. <br /> r-~ 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> k � <br /> 17-1 <br /> I <br /> a { <br /> r7 <br /> r ' <br /> NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> k <br /> - f late 12 <br /> F + <br />