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z <br /> I�i�,tt3 Mass Balance Calculation, Parcel <br /> (8-People, add Second'Dwelling Unit) <br /> ,I <br /> ;i <br /> Data Input: ti <br /> Occupancy: 8 people Waste Loading(W): 0.77 in/yr <br /> Gallons Per Person Per Day_ 50 gpd/person Site Area(A): 7.00 Acre <br /> Effluent Quantity(Q): 400 Gals 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: <br /> ;h <br /> Mass Balance(IFI 3.16mg/L-N iP <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> I <br /> Percent of MCL Nitrate as N 32% <br /> Equations: I� <br /> 8 people x 50 gals/day/person =400 gals/day Find Effluent Quan&y <br /> (W) in (Q) galx x 365 day x 1 acre x 12 in x 1 F�''d <br /> yr day 7.48 gal ' 1 year. 43,560 fe 1 ft (A) <br /> 0.77 irVyr(site)=400 gaUday x(1 cu-ft 1.7.48 gals)x(365 days/1 year)x(1 acre 1.43,560 sq-ft)x(12 in/1 ft)x(1 site/7 acres) <br /> Nc= WN.(1-d)+RNA antz che-Fenne,more E uation Nc <br /> W+R <br /> I <br /> - <br /> 3.16 mg/L-N=((0-77 in/yr x 45 mg/L-N x(1-0.25))+(7.86.iri/yr x 0.17mg/L-N))/(0.77 in/yr+7 86 in/yr), <br /> II <br /> Variables: ' <br /> Nc=Average nitrate-N concentration(m9A)of combined effluent and rainfall percolate(9.16 mg/L-N), <br /> W=Uniform waste water loading for study area(in/yr)(0.77 incheslyear). 1 <br /> Nw=Total nitrate-N concentration of waste water percolate(45 mgfL-N). r <br /> d=t=raction of nitrate-N loss due to denitrification in the soil(25%). IIF <br /> R=Uniform deep percolation of rainfall(7.86 intyr). <br /> Nb=Background nitrate-N concentration of rainfall(4.17 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. II <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 7.86 in/yr,see-deep percolation of rain worksheet. <br /> 4..Assume background nitrate-N concentration of rainfall is 4.17 mg/L-N based on'range by <br /> Hantzsche and Fennemore, 1992_' !i <br />, !!i <br /> . c <br /> I <br /> (I • r M <br /> NEIL O.ANDERSON&ASSOC_,INC. - <br /> - oFblew�[ti fERYtCE6-OGFIYEHWGIABOMTalaE6 Y ti <br /> ' IM <br /> ;I FLATS 5 <br />