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._..rate Mass Balance Calculatio,_ <br /> Acreage: 110 (Parcel no. 1 ) <br /> _ Data Input: <br /> Resident Use: Gallons/person/day: 50 gals/day Waste Loading (W): 0.03 ir✓yr <br /> Persons: 5 Site Area (A): 110.0 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 in/yr <br /> Result: <br /> Mass Balance(N j: 0.4 mg/L-N <br /> -- MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 4% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Unit Conversion <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) Equation <br /> 0.03 in/yr(site) =250 gal/day '(1 cu-ft/7.48 gals)`(365 days/1 year)*(I acre/43,560 sq-ft)*(12 in/1 (t)'(1 site/110 acres) <br /> N, = WN_,0-d)+RW Hentzsche-Fennemore <br /> W+R Equation <br /> 0.35 mg/L-N = ((0.03 in/yr*45 mg/L-N '(1-0.25))+(5.65 in/yr'0.17mg/L-N))/(0.03 in/yr+5.65 ir✓yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(0.35 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr)(0.03 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. <br /> - �VEElQy <br /> NEIL O.ANDERSON 8 ASSOC.,INC. <br /> (£OlEP1NC4 SERNQS.E1fi1NEERMG LABOMiONES Z Y <br /> IIWunbnLn.LOE1.CR S4V O � <br /> Rmisxnm SSS OSE' <br /> PLATE 18 <br />