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Nitrate Mass Balance Calculation Input: ' From Table 2(Q): 560 gpd Total Nitrogen Con.-Effluent Stream(Nw): 45.00 mg/L-N Site Area(A): 3.47 Acre Concentration Rain(Nb): 1.00 mg/L-N Denitrification(d): 35% Deep Perc.of Rain(R): 6.84 inches Result: Mass Balance(Nc): 7.80 mg/L-N MCL Drinking Water Nitrate as N: 10.00 mgA.-N Percent of MCL Nitrate as N: 78% Waste Loading(W): 2.17 in/yr Equations: (W) in = (Q) gal x 1 fta x 365 day x 1 acre x 12 in x 1 Find Yr day 7.48 gal 1 vear 43,560 ft, ft (A)acre 2.17 in/yr/site=560 gal/day 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/3.47 acres) r Nc= WN_(1-d)+RN. Hantzsche-Fennemore Equation(Nc) W+R 7.8 mgA-N=((2.17 in/yr x 45 mgt-N x(1-0.35))+(6.84 in/yr x 1mg1L-N))1(2.17 in/yr+6.84 in/yr) r Variables: Nc=Average nitrate-N Concentration(mg/1)of Combined effluent and rainfall percolate(7.8 mg/L-N). W=Uniform waste water loading for study area(intyr)(2.17 inches/year). Nw=Total nitrate-N Concentration of waste water percolate(45 mg/L-N). ' d=Fraction of nitrate-N loss due to denitrification in the soil(35%). R=uniform deep percolation of rainfall(6.84 in/yr). Nb=Background nitrate-N concentration of rainfall(1 mg/L-N). r Assumptions: 1. Nitrate-N Concentration of waste stream based on estimate of 45 mg/L-N. Assumption based on work from Hantzsche and Finnemore,1992. _ 2. Fraction of ndrate-N loss due to denitrification in the soil is assumed to be 35%. Assumption based on work from Hantzsche and Finnemore,1992. 3. Estimated deep percolation of rainfall is 6.84 intyr,see deep percolation of rain worksheet. 4. Assume background nitrate-N Concentration of rainfall is 1 mg/L-N based on range by Hantzsche and Fennemore,1992. 'euso s ' NEIL O.ANDERSON d ASSOC.,INC. Flatc 9