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y Nitrate Mass Balance Calculation <br /> Parcel 2 <br /> Data Input: <br /> i <br /> Effluent Quantity(Q): 544 gaWday Concentration Rain (Nb): 0.10 mg/L-N <br /> Effluent Stream (N,,): 53.00 mg/L-N Denitrification (d): 35.0% <br /> Site Area(A): 2.68 Acres Deep Perc. of Rain (R): 9.00 in/yr <br /> Waste Loading (W): 2.73 inlyr <br /> Result: <br /> Mass Balance(N j: 8.1 mg(L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 81% <br /> Equations: <br /> (W) in = (Q) gal x 1 W x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft' 1 ft (A)acre <br /> 2.73 in/yr(site) =544 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/2.68 acres) <br /> N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation(NO <br /> W+R <br /> 8.09 mg/L-N=((2.73 inlyr x 53 mg/L-N x(1-0.35))+(9 in/yr x 0.1mg/L-N))/(2.73 inlyr+9 inlyr) <br /> Variables: <br /> i <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate (8.09 mg/L-N). <br /> W= Uniform waste water loading for study area (inlyr) (2.73 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(53 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil (35%). <br /> R=Uniform deep percolation of rainfall (9 in/yr). <br /> Nb= Background nitrate-N concentration of rainfall (0.1 mg/L-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 53 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> 3. Estimated deep percolation of rainfall is 9 in/yr, see deep percolation of rain worksheet.. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.1 mg/L-N. <br /> I <br /> i <br /> i <br /> NEIL O. ANDERSON <br /> AND ASSOCI ATES <br />