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Nitrate Mass Balance Calculation <br /> (2-Acre Parcel) <br /> Data Input: <br /> Waste Loading(W): 3.53 in/yr <br /> Site Area(A): 2.00 Acre <br /> Effluent Quantity(Q): 525 Gals Concentration Rain(Nb): 0.17 mgt-N <br /> Effluent Stream(Nw): 45.00 mg/L-N Denitrification(d): 10% <br /> Result: Deep Perc.of Rain(R): 6.84 inches <br /> Mass Balance(Nc): 13.90 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.00 mg/L-N <br /> Percent of MCL Nitrate as N 139% <br /> Equations: <br /> From Table 7 in Report: 525 Gals Find Effluent Quantity(Q) <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 qal 1 year 43,560 ft 1 ft (A) <br /> 3.53 in/yr(site) =525 gaUday x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site 12 acres) <br /> N,= WN-0-d)+R N,, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 13.9 mg/L-N=((3 53 in/yr x 45 mg/L-N x(1-0.1))+(6.84 in/yr x 0.17mg/L-N))/(3.53 in/yr+6 84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(13.9 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(3.53 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(10%). <br /> R=Uniform deep percolation of rainfall(6.84 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall(0.17 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. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 10%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992, <br /> 3. Estimated deep percolation of rainfall is 6.84 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 /> NEIL O.ANDERSON S ASSOC.,INC.�r <br /> �OIEOWCK SERN(£SbliN®iNi LIHOM�9gB I= WJ <br /> .- u m nloJi.Ca 610 �p A/ <br /> F®)EI.LOt �SS oc\ <br /> Plate 9 <br />