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{ <br /> Nitrate Mass Balance Calculation <br /> IF <br /> FjData Input: <br /> Waste Loading(W): 2.82 in/yr <br /> Site Area(A): 1.33 Acre <br /> F! Effluent Quantity(Q): 279 Gals Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Stream(Nw): 35.00 mg/L-N Denitrification(d): 25% <br /> Deep Perc,of Rain(R): 6.84 inches <br /> Result: <br /> Mass Balance(Nc): 8.4 mg/L-N <br /> FMCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Perc 14 - Nitrate as N 8 0 <br /> Equ - <br /> F From Table 51n Report: 279 Gals Find Effluent Quantity(O1 <br /> (W) in = x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,566 ft 1 ft (A)acre <br /> I . <br /> 2.82 in/yr(site) =273 gaUday x(l cur-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site/1.33 acres) <br />` N�= WN-(1-d}+RN, Nantzsche-Fennemore Enation Nc <br /> W+R <br /> 8.37 mg/L-N=((2.82 in/yr x 35 mg/L-N x(1-0.25))+(6.84 in/yr x 1mg/L-N))/(2.82 in/yr+6.84 in/yr) <br /> Variables: <br /> FNc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(8.37 mg/L-N). <br /> W=Uniform waste water loading for study area(inlyr)(2,82 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(35 me L-N). <br /> F <br /> d=Fraction of nitrate-N loss due to denitrification in the soil(25%). <br /> R=Uniform deep percolation of rainfall(6.84 inlyr). <br /> Nb=Background nitrate-N concentration of rainfall(1 mg/L-N). <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 35 mg1L-N. <br /> Assumption based on work from Crites,R.,Tchobanoglous,G.,1998. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br /> �I Assumption based on work from Nantzsche and Finnemore, 1992, <br /> 3. Estimated deep percolation of rainfall is 6.84 inlyr,see deep percolation of rain worksheet. <br /> y ` 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N based on range by <br /> t•iantzsche and Fennemore,1992. <br /> F r <br /> i L . <br /> P E N ski <br /> NEIL O.ANDERSON&ASSOC.,Mc. <br /> fIOt CHNCAL SERVIc�s-[ INE HGUSOMTMM S <br /> a Hw,tLn.L��I.CA 962G S <br /> RaOiac-an JS GC.r <br /> Plate 9 <br />