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F <br /> ^ C) <br /> t J <br /> Nitrate Mass Balance Calculation <br /> ' _ ' <br /> F <br /> Data Input: <br /> rI Site Area (A): 25.0 Acres <br /> Effluent Quantity (Q): 343 gals/day Concentration Rain (Nb): 0.17 mg/L-N <br /> Effluent Stream (N I): 45.00 mg/L-N Denitrification (d): 25.0% <br /> f? Waste Loading ("' : 0.18 irVyr Deep Perc. of Rain (R): 7.86 in <br /> Result: <br /> Mass Balance (NI): 0.94 mg/L-N <br /> MCI-Drinking Water. 10. mg/L-N <br /> Percent of MCL: 9% <br /> _ j <br /> ' Equations: <br /> (W) in _ (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ft' 1 ft (A) acres <br /> Nc mo WN-(l-d)+RN <br /> L W+R <br /> Variables: <br /> r Nc= Average nitrate IN concentration (mg/1) of combined effluent and rainfall percolate (0.94 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr). <br /> 343 gals/day on a!25 acre site (0.18 in/yr). <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 (25%). <br /> R= Uniform deep percolation of rainfall (7.86 in/yr). <br /> Nb= Background nitrate-N concentration of rainfall (0.17 mg/L-N). <br /> i <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> L , <br /> 2. Fraction of nitrate-N loss due to Denitrification in the soil Is assumed to be 25%. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 3. Estimated deep percofation of rainfall is 7.86 in/yr, see Worksheet No. 1. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1991. <br /> i <br /> 4f <br /> t°�Ar° <br /> NEIL O.ANDERSON&ASSOC.,INC. ~ <br /> DEOIEOIN[46EAVIQS-F11iIN®WO WOMTMU Z W <br /> IIHw�ImlrtbW,CA YSK O A <br /> RVII AT.Aq 7Sso <br /> PLATE 12 <br /> � � I <br />