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Nitrate Mass Balance Calculation <br /> Determine minimum acreage for a 3-bedroom residence <br /> Effluent Quantity(Q): 150.00 galslday Site Area (A): 0.75 Acres <br /> + Effluent Stream ft): 46.50 mg/L-N Concentration Rain (Nb): 0.17 mg/L-N <br /> Waste Loading (W): 2.69 in/yr Denitrification (d): 25.0% <br /> Result: Deep Perc. of Rain (R): 6.79 in <br /> Mass Balance (N j: 10.0 mg/L-N <br /> a <br /> MCI-Drinking Water: 10.0 mglL-N <br /> Percent of MCL: 100% <br /> Equations: <br /> (VIr) in = (Q) gal x 1 ft3 x 36. 5 dx 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 fe 1 ft (A) acres <br /> Nr mg_= W 1- +RN <br /> L W+R <br /> Variables: <br /> i' Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (10.01 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr). <br /> 150 galstday 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 (6.79 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/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 /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 3. Estimated deep percolation of rainfall is 6.79 inlyr, 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 /> . <br /> NEIL O.ANDERSOxtNllou&slvA`SLn SLoaOdmC. .,INC. <br /> OECMOINCAL SUMCES-ENMMBEM13 LAOMTOHES <br /> CA vn <br /> 387-NO <br /> PLATE 9 <br />