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U <br /> Nitrate Mass Balance Calculation <br /> Designated Remainder,'`7.0 Acres <br /> t� Data Input: <br /> i <br /> Site Area (A): 7.0 Acres <br /> Effluent Quantity (Q): 250 gals/day Concentration Rain (Nb)' 0.97 mg/L-N ! <br /> Effluent Stream (Nj: 45.00 mgk-N Denitrification (d): 25.0% r <br /> Waste Loading (W): 0.46 in/yr Deep Perc. of Rain (R): 7.86 in <br /> Result: <br /> i <br />€ Mass Balance(N j: 2.10 mg/L-N <br /> MCI-Drinking Water: 90. mg(L-N <br /> Percent of MCL: 21% <br /> j <br /> Equations: <br /> (VII) in = (Q) gal x 1 W x 365 day x .t 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ft' 1 ft (A) acres <br /> i <br /> N,= .WN.(1_-d)++RN,, <br /> W+R <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (2.1 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) ' <br /> W is 150 gallons per day on a 7 acre site (0.48 in/yr). <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 (7.86 in/yr). . <br /> F 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 7.86 in/yr, see Worksheet No. 1. <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 /> +9E Rs y <br /> N8L O.ANDERSON&ASSOC.,INC. <br /> i WatrCWOCALSMI CES-9iCi41iEfMOLU RATaRES Z m <br /> 72 Hw*t�Lrt LBO,CA 93M O A <br /> R�I�T90t 7sSOG�� <br /> i'LATF 13 <br /> f <br />