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Y <br /> Revised Nitrate Mass Balance Calculabun <br /> July 29, 2005 <br /> Data Input: <br /> Effluent Quantity(Q): 784 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream(N„,): 85.00 mg/L-N Denitrification (d): 10.0% <br /> Site Area (A): 9.90 Acres Deep Perc. of Rain (R): 5.76 in/yr <br /> Waste Loading (W): 1.06 in/yr <br /> Result: <br /> Mass Balance(N j: 12.8 mg/L-N <br /> f MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 128% <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 ft' 1 ft (A)acre <br /> 1.06 in/yr(site) =784 gal/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/9.9 acres) <br /> N,= WN,.,(1-d)+RN,, Nantzsche-Fennemore Equation (Nc) <br /> W+R <br /> 12.78 mg/L-N= ((1.06 in/yr x 85 mg/L-N x (1-0.1))+(5.76 in/yr x 1mg/L-N))/(1.06 in/yr+5.76 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (12.78 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr) (1.06 incheslyear). <br /> Nw=Total nitrate-N concentration of waste water percolate(85 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil (10%). <br /> R= Uniform deep percolation of rainfall (5.76 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 85 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 5.76.in/yr, see deep percolation of rain worksheet. <br /> i 4. .Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> i <br />+r <br /> i <br /> r <br /> "004 NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate 1 <br />