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Nitrate Mass Balance Calculation: <br /> Standard Septic System (39 Acre Parcel) <br /> Data Input: <br /> Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Quantity (Q): 28 gals/day Denitrification (d): 15% <br /> Effluent Stream (N,): 45 mg/L-N Deep Perc. of Rain (R): 6.84 in/yr <br /> Site Area (A): 39.0 Acres Waste Loading (W): 0.01 in/yr <br /> Result: <br /> Mass Balance (N j: 1.1 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 11% <br /> Equations: <br /> (W) in = (Q) gal x 1 W x 365 day x 1 acre x 12 in x 1 Find W <br /> yr day 7.48 qal 1 year 43,560 ft2 1 ft (A) <br /> 0.01 in/yr(site) =28 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/39 acres) <br /> N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation (Nc) <br /> W+R <br /> 1.05 mg/L-N = ((0.01 in/yr x 45 mg/L-N x (1-0.15))+(6.84 in/yr x 1 mg/L-N))/(0.01 in/yr+6.84 in/yr) <br /> Variables: <br /> Nc =Average nitrate-N concentration (mg/I) of combined effluent and rainfall percolate (1.05 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (0.01 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 /> R = Uniform deep percolation of rainfall (6.84 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 6.84 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> GEOMCNNCAL SERVICES-ENGINEERNG LABORA10... 1 W� <br /> 22 Houston Ln.L-1,CA SQ <br /> (30B)00]-SI01 P <br /> 9SSOG / <br /> Plate 9 <br />