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_.rate Mass Balance Calculatio. <br /> Acreage: 2.0 (Parcels 2-6) _ <br /> Data Input: <br /> Resident Use: Gallons/person/day: 50 gals/day Waste Loading (W): 1.68 in/yr <br /> Persons: 5 Site Area (A): 2.0 Acres <br /> Effluent Quantity(Q): 250 gals/day Concentration Rain (Nb): 0.17 mg/L-N <br /> Effluent Stream (Nj: 45.00 mg/L-N Denitrification (d): 25.0% <br /> Deep Perc. of Rain (R): 5.65 ir✓yr <br /> Result: <br /> Mass Balance(NG): 7.9 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mgt-N <br /> Percent of MCL Nitrate as N 79% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft' x 365 day x 1 acre x 12 in x 1 Unit Conversion <br /> yr day 7.48 gal 1 year 43,560 ftz 1 ft (A) Eauation <br /> 1.68 in/yr(site) =250 gal/day'(1 cu-ft/7.48 gals)'(365 days/1 year)*(1 acre/43,560 sq-ft)`(12 in/1 ft)*(I site/2 acres) <br /> N, = WN (1-d)+RNn Hantzsche-Fennemore <br /> W+R Eauation <br /> 7.87 mg/L-N= ((1.68 in/yr'45 mg/L-N '(1-0.25))+(5.65 in/yr'0.17mg/L-N))/(1.68 irVyr+5.65 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/I) of combined effluent and rainfall percolate(7.87 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr)(1.68 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 (5.65 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, 1992. <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, 1992. <br /> 3. Estimated deep percolation of rainfall is 5.65 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, 1992. 'of RJoy <br /> - NEIL O.ANDERSON 3 ASSOC.,INC. <br /> (£OlEO1MCK 5ENNQS-EIGINEENMG LGNGMTONES Z Nr <br /> aro..n.u. eei,c�esn o � <br /> JJO� <br /> PLATE 17 <br />