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N,_,,ite Mass Balance Calculation, Parcel <br /> (8-People, add Second Dwe[ling Unit)' <br /> . a - <br /> ii <br /> Data Input: " <br /> Occupancy: 8 people Waste Loading(W): 1.08 in/yi <br /> Gallons Per Person Per Day: 50 gpd/person Site Area(A): 5.00 Acre <br /> Effluent Quantity(Q): 400 Gals Concentration Rain(Nb): 0.97 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: Ij <br /> Mass Balance(Nc): 4.21 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N. 'N <br /> Percent of MGL Nitrate as N 42% <br /> Equations: <br /> " 8 people x 50 gals/day/person =400 gals/day Find Effluent Quan*Q <br /> (W) in = (Q) gal x _1 fes x 365da x 1acre x 12'In x 1 Find <br /> yr day 7.48 gal 1 year 43,564 ft' . 1 ft (A) <br /> 1.08 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/f ft)x(1 site/5 acres) <br /> Nr.= WN,,,(1-d]+RNA llanf sche-Fennemore Eouation lNc} <br /> W+R i. <br /> 4-21 mg/L-N=((1.08 in/yr x 45 mgYL-N x(1-0.25))+(7.86 in/yr x 0.17mg/L-N))/(1.08 in/yr+7.86 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mgA)of combined effluent and,rainfall percolate(4.21 mg1L-N). <br /> W="Uniform waste water loading for study area(in/yr)(1.08 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(45 mg/L-N). i <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). i <br /> Nb=Background nitrate-N concentration of rainfall(0.17.mg/L-N), " <br /> If <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 /> i' <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. M <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 /> Han tzsche and Fen nemore, 1992 <br /> • ii • ' <br /> ,i <br /> li <br /> If <br /> 3 <br /> I� NEIL O-ANDERSON 6 ASSOC:,INC. <br /> Rbw�ln Ladi.Fa�Q� O � <br /> Rul sr-am �rS pL�' <br /> I: <br /> ii PLATE 3 <br /> F <br /> i <br /> i <br />