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Revised Nitrate Mass Balance Calculation <br />11655 S Union Road, Manteca <br />Data Input: <br />Effluent Quantity (Q): <br />Effluent Stream (N w): <br />Site Area (A): <br />Result: <br />Mass Balance (Na: <br />MCL Drinking Water Nitrate as N: <br />Percent of MCL Nitrate as N <br />350 gals/day <br />35.00 mg/L-N <br />0.77 Acres <br />18.4 mg/L-N <br />10.0 mg/L-N <br />184% <br />Concentration Rain (N b): 1.00 mg/L-N <br />Denitrification (d): 25.0% <br />Deep Perc. of Rain (R): 2.74 in/yr <br />Waste Loading (W): 6.11 in/yr <br />Equations: <br /> <br />(W) in = (Q) gpj. x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> Find (W) <br />yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre <br />6.11 in/yr (site) =350 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 / 0.77 acres) <br /> <br />N c = WN w(1-d)+RN b Hantzsche-Fennemore Equation (Nc) <br />+R <br />18.43 mg/L-N = ((6.11 in/yr x 35 mg/L-N x (1-0.25))+(2.74 in/yr x 1mg/L-N))/(6.11 in/yr +2.74 in/yr) <br />Variables: <br />Nc = Average nitrate-N concentration (mg/I) of combined effluent and rainfall percolate (18.43 mg/L-N). <br />W = Uniform waste water loading for study area (in/yr) (6.11 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 (2.74 in/yr). <br />Nb = Background nitrate-N concentration of rainfall (1 mg/L-N). <br />Assumptions: <br />Total nitrogen concentration of waste stream based on estimate of 35 mg/L-N. <br />Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br />Estimated deep percolation of rainfall is 2.74 in/yr, see deep percolation of rain worksheet. <br />Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br />Opetra log ix <br />g,ophy!,ic, environmental - geology <br />I I <br /> Plate 9