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Nitrate Mass Balance Calculation <br /> 5700 E. Nile Road, Manteca, CA <br /> Data Input: <br /> Effluent Quantity(Q): 6,378ga/s/day Concentration Rain (Nb): 1.0 mg/L-N <br /> Effluent Stream (NW): 35mg/L-N Denitrification (d): 35.0% <br /> Site Area (A): 15.36 Acres Deep Perc. of Rain (R): O.99 in/yr <br /> Waste Loading (W): 5.58 in/yr <br /> Result: <br /> Mass Balance(Nc): 25,4 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10 mg/L-N <br /> Percent of MCL Nitrate as N 254% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find W <br /> yr day 7.48 gal 1 year 43,560 ftz 1 ft (A) acre <br /> 5.58 In/yr(site)=6,378 gal/day x(I cu-ft/7.48 ga/s)x(365 days/1 year)x(I acre/43,560 sq-tt)x(12 In/1 ft)x(1 site/15.36 acres) <br /> N,=WNW(1-d)+RNA Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 25.4 mg/L-N=((5.58 in/yr x 35 mg/L-N x(1-0.15))+(0.99 in/yr x Img/L-N))/(5.58 in/yr+0.99 in/yr) <br /> Variables: <br /> Nc = Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(25.4 mg/L-N). <br /> W = Uniform waste water loading for study area (in/yr) (5.58 inches/year). <br /> Nw =Total nitrate-N concentration of waste water percolate (35 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (15%). <br /> R = Uniform deep percolation of rainfall (0.99 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 35 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 0.99 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br />