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11 0, n <br /> Nitrate Mass Balance Calculation " <br /> Fil <br /> Minimum Acreage: 3.3 <br /> Fj <br /> Data Input: j <br /> Resident Use: Gallons/person/day: 50 gals✓day Waste Loading (W): 1.02 in/yr <br /> Persons: 5 Site Area(A): 3.3 Acres <br /> Effluent Quantity(Q): 250 gals✓day Concentration Rain (N j 0.17 mg/L-N <br /> F1Effluent Stream ft): 45.00 mg/L-N Denitrification (d): 25.0% <br /> Deep Perc. of Rain (R): 2.45 in <br /> � Result: <br /> Mass Balance (N j- 10.0 mg/L-N <br /> MCL Drinking Water: 10. mg/L-N i <br /> Percent of Maximum <br /> Drinking Water Standard: 100% <br /> i <br /> Equations:t (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 ft2 1 ft (A)acres <br /> NC = WN 1-d +RN <br /> _.. <br /> VII+R <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (10.03 mg/L-N). <br /> Fj! W= Uniform waste water loading for study area (in/yr) (1.02 inches/year). <br /> 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 (2.45 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 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 /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> 3. Estimated deep percolation of rainfall is 2.45 in/yr, see deep percolation of rain worksheet. <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 /> ;10i <br /> o <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> GEOTECHNCAL SMACE8-EWANEMNO LABORATONE4 <br /> II Wwsm Ln.Ladi,CA 9M4D <br /> 37- m <br /> f PLATE 8 <br />