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N,,�te Mass Balance Calculation, Parcell <br /> (8-People, add Second Dwelling Unit) <br /> 0 <br /> Data Input: <br /> Occupancy: 8 people Waste Loading(W): 1.08 in/yr <br /> Gallons Per Person Per Day: 56 gpd/person Site Area(A): 5.00 Acre <br /> Effluent Quantity(Q): 400 Gals Concentration Rain(Nb): 0.17 mg/L-N <br /> Effluent Stream(Nw): 45.00mg/L-N Denitrification(d): 25% <br /> Deep Perc.of Rain(R): 7.86 inches <br /> Result: I <br /> Mass Balance(Nc): 4.21 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N �) <br /> Percent of MCL Nitrate as N 42% iM <br /> Equations: ,I <br /> 8 people x 50 gals/day/person =400 gals/day Find Effluent Quantity(Q) <br /> (W). in = (Q) gal, x 1 W x 365 day x 1 acre x 12 in • x 1 Find <br /> Yr day. 7.48 gal 1 year 43,560 ftz 1 ft (A) <br /> g <br /> 1.08 inlyr(site)=400 gal/day x(i cu-R/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/5 acres) <br /> ;I <br /> Nc_ V,/NX1-d)+RNp Hantzsche-Fennemore Eauafion(Ncl <br /> W+R <br /> 4.21 mg/L-N=((1.08 irr/yr x 45 mg/L-N x(i-0.25))+(786 in/yr x 0.17mg/L-N))/(1.08 in/yr+7 86 irV%r). <br /> Variables: <br /> Ne=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(4.21 mg/L-N). <br /> W=Uniform waste water loading for study area(inlyr)(1.08 incheslyear). <br /> Nw=Total nitrate-N concentration of waste water percolate(45 mg1L-N). <br /> d Fraction of nitrate-N loss due to denitrification in the soil(25%)- <br /> R=Uniform deep percolation of rainfall(7.86 inlyr). <br /> Nb=Background nitrate-N concentration of rainfall(0.17 mg/L-N). <br /> Assumptions: li <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 786 inlyr,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, 9992. <br /> 4 <br /> ' sl <br /> u , <br /> ri <br /> l <br /> !� T pc�s6s <br /> !' NEIL O.ANDERSON&ASSOC.,INC. <br /> [£°fECNMCAL SEANCES-EAGIIiEIXNG LAB°MEMEs 2 <br /> II IEuabnln LeA1.CA fR4 �` <br /> .I <br /> PLATE 2. <br /> II . <br />