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Nitrate Mass Balance Calculation <br /> (4 people, 2.10 acres) <br /> Data Input: <br /> Occupancy: 4 people Waste Loading(W): 1,28inlyr <br /> Gallons Per Person Per Day: 50 gpolperson Skte Area(A): 2.10 Acre <br /> Effluent Quantity(Q): 200 Gals Concentration Rain(Nb): 0.17 mg1L-N <br /> Effluent Stream(Nw): 45.00 mg/L-N Denitrification(d): 25% <br /> Deep Pere.of Rain(R): 6.79 inches <br /> Result: <br /> Mass Balance(Nc): 5.30 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg1L-N <br /> Percent of MCL Nitrate as N 55% <br /> Equations: <br /> 4 people x 50 gals/day/person =200 gals✓day Find Effluent Quantity(Q) <br /> (W) in = (Q) gal x 1 ftp x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ftp 1 ft (A) <br /> 1.28 inlyr(site)=200 gallday x(1 cu-ft 17.48 gals)x(365 days✓1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site 12.1 acres) <br /> N,,= WN l-d)+RN. Hantzsche-Fennemore Equation fNcJ <br /> W+R <br /> 5.5 mg/L-N=((1.28 in/yr x 45 mg1L-N x(1-0.25))+(6.79 in/yr x 0,17mg1L-N))1(1.28 in/yr+6.79 inlyr) <br /> Variables: <br /> No=Average nitrate-N concentration(mgA)of combined effluent and rainfall percolate(5.5 mg/L-N). <br /> W=Uniform waste water loading for study area(inlyr)(1.28 inchestyear). <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(6.79 inlyr). <br /> i <br /> Nb=Background nitrate-N concentration of rainfall(0.17 mg/L-N). <br /> i <br /> Assumptions: <br /> i <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 6.79 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 /> 1 <br /> 55{� <br /> 1 <br /> NEIL O.ANDERSON&ASSOC.,INC, <br /> aoaonwLaERvr�e Q KWReo U60RATCan ■ . <br /> n Xw—Lm Lv ,CA MUM O r <br /> ")367-vel <br /> 0C <br /> I <br /> PLATE 3 <br />