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r <br /> Nitrate Mass Balance Calculation <br /> Acreage: 74.84 <br /> 11 <br /> SCANNED <br /> Data Input: <br /> �t Resident Use: Gallons/person/day: 50 galslday Waste Loading (W): 0.04 inlyr <br /> Persons: 5 Site Area(A). 74.8 Acres <br /> Effluent Quantity (Q): 250 gaislday Concentration Rain (Nb): 0.17 mglL-N <br /> Effluent Stream (N,H): 45.00 mglL.-N Denitrification (d): 25.0% <br /> Deep Pere. of Rain (R): 2.45 in <br /> Result: <br /> Mass Balance(NG): 0.8 mg/L-N <br /> MCL Drinking Water: 10. mgA.-N j <br /> 4 Percent of Maximum <br /> t <br /> Drinking Water Standard: 8% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 36_ 5 day x 1 acre x 12 in x 1 <br /> I yr day 7.48 gal 1 year 43,560 ftZ 1 ft (A) acres <br /> I <br /> N,= WN-0-d +RN <br /> W+R <br /> E Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(0.77 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (0.04 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 />'k R= Uniform deep percolation of rainfall (2.45 in/yr). V-01 � <br /> Nb= Background nitrate-N concentration of rainfall (0.17 mg/L-N). <br /> a <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°x. <br /> Assumption based on work from Hantzsche and Irinnemore, 1991. <br /> 3. Estimated deep percolation of rainfall is 2.45 in/yr, see deep percolation of rain worksheet. <br /> t <br /> j 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> r_ Hantzsche and Fennemore, 1991. <br /> IE It <br /> NEIL.O.ANDERSON&ASSOC.,INC. <br /> MOTECKMCPL SERVICES-I YWIHWNG LMKMTOFIES % <br /> 72 Lbuston Ln.L.odl,CA 85M Q <br /> {zao�aeTSro� 14 S <br /> PLATE 6 <br />