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Nitrate Mass Balance Calculation <br /> Parcel No. 2, 5.0 Acres <br /> i <br /> I <br /> Data Input: <br /> Site Area (A). 5.0 Acres <br /> Effluent Quantity(Q). 250 gals/day Concentration Rain (Nt): 0.17 mg/L-N <br /> Effluent Stream (Nj: 45.00 mg/L-N Denitrification (d): 25.0% } <br /> Waste Loading (VII): a67 in/yr Deep Perc. of Rain (R): 7.86 in <br /> F <br /> Result: r <br /> Mass Balance (N,): 2.82 mg/L-N <br /> MCI-Drinking Water: 10. mg/L-N ; <br /> Percent of MCL: 28% <br /> Equations: <br /> { (VII) in = (Q) gal x 1 ft3 x 365 day x :11 acre x 12 in x 1 <br /> 1 yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acres <br /> N,= WN-(1-d)+RN,, <br /> W+R <br /> Variables: <br /> Nc= Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (2.82 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) " <br /> W is 150 gallons per day on a 5 acre site (0.67 in/yr). ,4 <br /> I 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 mg6 N). <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 /> 2. Fraction of nitrate-N loss due to Denitrification in the soil is assumed to be 25%. <br /> e Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 3. Estimated deep percolation of rainfall is 7.86 in/yr, see Worksheet No. 1. <br /> 4 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> i' Hantzsche and Fennemore, 1991. <br /> SOS <br /> NEIL O.ANDERSON&ASSOC.,INC.GEOMCHNCAL SERVICES-HYANMRNG LABORATORIES 22 H—t—Ln Lag,CA 97�"2%)367VC4 I <br /> PLATE 10 <br />