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F N,,.rte Mass Balance Calculation, Parcel <br /> (8-People, add Second Dwelling Unit) <br /> 4 <br /> ! <br /> Data Input: II <br /> Occupancy: 8 people Waste Loading(W): 0.64 in/yr <br /> Gallons Per Person Per Day: 50 gpd/person Site Area(A): 8.40 Acre <br /> Effluent Quantity(Q): 400 Gats Concentration Rain(Nb): 0.17 mg/L-N <br /> Effluent Stream(Nw): 45.00 mg/L-N Denitrification(d): 25% <br /> Deep Perc.of Rain(R): 7.86 inches <br /> Result: T <br /> Mass Balance(Ne): 2.70 mg/L-N H <br /> u <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N 27% I� <br /> Equations: - <br /> u _ <br /> 8 people x 50 gals/day/person =400 gaWday, Find Effluent QuantibLQ <br /> (W) in =.(Q) gal x 1 ft3 x 365 day x 1 acre z 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 fti ft -(A) <br /> ii <br /> 0.64 in/yr(site)=400 gal/day x(1 cu-ft/7 48 gals)x(365.days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/6.4 acres) <br /> .r <br /> N,= LAWI-LAW Hantzsche-Fennemo Equation Nc <br /> W+R <br /> 2-7 mg/L-N=((0.64 in/yr x 45 mg/L-N x(1-0,25))+(7.86 in/yr x 0.17mg/L-N))/(0.64 in/yr:+7.86 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/!)of combined effluent and rainfall percolate(2.7 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(0.64 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(7.86 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall(0.17 mg/L-N). 16 <br /> I� <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. II <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> •ii <br /> ,r <br /> 2, Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. E <br /> Assumption based on work from Hantzsche and Finnemore, 1992. E <br /> f <br /> 3. Estimated deep percolation of rainfall is 7.86 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 /> l <br /> it <br /> " <br /> I! <br /> P <br /> NEIL O.ANDERSON S ASSOC.,INC. r t <br /> _ Q°IEo,Ncv-�M�b-EIGIMEERfI°LIIB°IGT°AFS } <br /> - f - _ IIlbunen Ln.�.ca Rii <br /> PLATE 1 <br />