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Data Input: <br />Nitrate Mass Balance Calculation <br />12958/12970 <br />E 3ahant Road <br />Acampo, California <br />Effluent Quantity (Q): 750 gals/day <br />Effluent Stream (NW): 35.00 mg/L-N <br />Site Area (A): 4.59 Acres <br />Result: <br />Mass Balance (N j: 8.4 mg/L-N <br />MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br />Percent of MCL Nitrate as N 84% <br />Equations: <br />Concentration Rain (Nb): 1.00 mg/L-N <br />Denitrification (d): 25.0% <br />Deep Perc. of Rain (R): 5.29 in/yr <br />Waste Loading (W): 2.20 in/yr <br />(W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find CW <br />yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre <br />2.2 in/yr (site) =750 gal/day x (i cu -ft/ 7.48 gals) x (365 days/ 1 year) x (i acre/ 43,560 sq -ft) x (12 in / 1 tt) x (1 site / 4.59 acres) <br />N, = WNW 1-d +RNb <br />W+R <br />Hantzsche-Fennemore Equation (Nc) <br />8.41 mg/L-N = ((2.2 in/yr x 35 mg/L-N x (1-0.25))+(5.29 in/yr x Img/L-N))/(2.2 in/yr +5.29 in/yr) <br />Variables: <br />Nc = Average nitrate -N concentration (mg/1) of combined effluent and rainfall percolate (8.41 mg/L-N). <br />W = Uniform waste water loading for study area (in/yr) (2.2 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 (5.29 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 5.29 in/yr, see deep percolation of rain worksheet. <br />4. Assume background nitrate -N concentration of rainfall is 1 mg/L-N. <br />J&pe.tralogix <br />Plate 9 <br />