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1 <br /> Nitrate Mass Balance Calculation <br /> Determine minimum acreage for a 3-bedroom residence <br /> Effluent Quantity(Q): 150.00 gals/day Site Area (A): a-75 Acres <br /> Effluent Stream ft): 46.50 mglL-N Concentration Rain (NO: 017 m_q&-N <br /> Waste Loading (W): 2.69 inlyr Denitrification (d): 25.0% <br /> Result: Deep Perc. of Rain (R): 6.79 in <br /> Mass Balance (Nj: 10.0 mg(L-N <br /> MCLDrinking Water: 10.a mglL-N <br /> Percent of MCL: 100% <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 fe 1 ft (A) acres <br /> Nr ma - WN,..(1-d)+RNh <br /> L W+R <br /> Variables: <br /> Ne=Average nitrate-N concentration (mg/l) of combined effluent and rainfall percolate (10.01 mg/L-N). <br /> 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 T 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 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 /> r aEaaa� <br /> NEIL d.ANDERSON S ASSOC.,INC. <br /> GEOIE41NGAL 3MVICIES-EMNEERMO UBOMTOFIES Z y' <br /> 72 H.M—LML-d.CA 92M <br /> RWIae7-9m 1SS0 <br /> PLATE 9 <br />