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Nitrate Mass Balance Calculation <br /> Acreage: 80.84 <br /> F) <br /> t <br /> Data Input: <br /> Resident Use: Gallons/person/day: 50 gals/day Waste Loading (W): 0.17 inlyr <br /> Persons: 20 Site Area (A): 80.8 Acres <br /> Effluent Quantity(Q): 1,000 galslday Concentration Rain (NJ 0.17 mglL-N <br /> Effluent Stream (N,): 45.00 mgA--N Denitrification (d): 25.0% <br /> Deep Perc. of Rain (R): 2.45 in F <br /> Result: <br /> Mass Balance (N j.- 2.3 mg/L-N <br /> MCL Drinking Water: 10. mg1L-N <br /> Percent of Maximum <br /> Drinking Water Standard: 23% + <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 ftz 1 ft (A) acres <br /> Nc= WN 1-d +RN <br /> F1 <br /> W+R <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(2.3 mg/L-N). <br /> -1i W= Uniform waste water loading for study area (in/yr) (0.17 incheslyear). <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 <br /> } <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 /> I 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 /> E ' 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 /> °eas�ti <br /> NEIL.O.ANDERSON&ASSOC.,INC. <br /> GEOIECHHCAL SMVICE3-EMN®tNG LARMTOREB i. <br /> 22 lhustoo Ln.Lodi,CA 9'.IIp O A` <br /> (306!967-"3101 7 <br /> y! 1 ssoc <br /> PLATE 7 <br />