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Nitrate Mass Balance Calculation <br /> f� <br /> Determine minimum acreage for a 3-bedroom residence <br /> f-" Effluent Quantity (Q): 950.00 gals/day Site Area (A): 0.75 Acmes <br /> Effluent Stream ft): 46.50 mg/L-N Concentration Rain (Nb): Q 97 mg/L-N <br /> Waste Loading (W): 2.69 in/yr Denitrification (d): 25.0 , <br /> Result: Deep Pere. of Rain (R): 6.79 in Y <br /> Mass Balance(N,): 10,0 mg/L-N <br /> MCLDrinking Water: 10.0 mglL-N <br /> Percent of MCL: 100% _ <br /> Equations: J <br /> (W) in = (Q) gal x 1 W x 365 da.V x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acres <br /> N. Mg_= WNWf1.-d}+RNt, <br /> L W+R <br /> I� <br /> I Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (10.01 mg/L-N). <br /> a W= Uniform waste water loading for study area (in/yr). <br /> 150 gals/day on a 0.75 acre site. (2.69 in/yr). <br /> Nw=Total nitrate-N concentration of waste water percolate(46.5 mg/L-N). <br /> - d= Fraction of nitrate-N loss due to denitrification in the soil (25%). <br /> R= Uniform deep percolation of rainfall (6.19 in/yr). <br /> Nb= Background nitrate-N concentration of rainfall (0.17 mg/L-N). <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 46.5 mg/t:N. i <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> t� 2. Fraction of nitrate-N loss Glue to Denitrification in the soil is assumed to be 25%. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 3. Estimated deep percolation of rainfall is 6.79 in/yr, see deep percolation of rain table. <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 /> (OV! <br /> NEIL O.ANDERSON&ASSOC.,INC.WDW0IMUlSFRMCPS-B"PI ERNGUABORhTOFWES arwuami,,Lom,ca�o CHO)307sm <br /> PLATE 9 <br /> l <br /> I <br />