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`Nitrate Mass Balance Calculation'' <br /> Data Input: <br /> Effluent Quantity(Q): 175 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,): 35.00 mg/L-N Denitrification (d): 25.0% <br /> Site Area (A): 0.92 Acres Deep Perc. of Rain (R): 5.01 in/yr <br /> Waste Loading (W): 2.56 in/yr <br /> Result: <br /> Mass Balance(N j: 9.5 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 95% <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 ftZ 1 ft (A)acre <br /> 2.56 in/yr(site) =175 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site 10.92 acres) <br /> Nc= WN-(1-d)+RN,, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 9.53 mg/L-N=((2.56 in/yr x 35 mg/L-N x(1-0.25))+(5.01 in/yr x 1mg/L-N))/(2.56 intyr+5.01 intyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (9.53 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (2.56 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 (25%). <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 35 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <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 /> P OE Rf�ti <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> GEOTECNNCAL SERVICES-ENGINEERNG LABORATORIES Z W <br /> 22 HousWn Ln.LOEI,CA 65260 10 ` <br /> a (2 09)357-37M s,S O`�> <br /> Plate 9 <br />