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i <br /> Mitrate Mass Balance Calculation <br /> Parcel 11 <br /> Data Input: <br /> Effluent Quantity(Q): 630 gals/day Concentration Rain (Ne): 1.00 mg/L-N <br /> Effluent Stream (Nv,,): 45.00 n7g/L-N Denitrification (d): 15.0% <br /> Site Area(A): 9.81 Acres Deep Perc. of Rain (R): 3.54 in/yr <br /> Waste Loading (W): 0.86 in/yr <br /> Result: <br /> Mass Balance{N�): 8.3 mg/L-N <br /> `'t MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 83% <br /> FI Equations: <br /> i <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 gal 1 year 43,560 ft 1 ft (A) acre <br /> 0.86 in/yr(site) =630 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x f acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/9.81 acres) <br /> F-] N, WN—(l-d)+RNh Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> Fj8.3 mg/L-N= ((0.86 in/yr x 45 mg/L-N x(1-0.15))+(3,54 in/yr x 1mg/L-N))/(0.86 inlyr+3.54 inlyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(8.3 mg1L-N). <br /> W=Uniform waste water loading for study area(in/yr) (0.86 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 (15%). <br /> R= Uniform deep percolation of rainfall(3.54 inlyr). <br /> Nb= Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> F; <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 45 mg/L-N. <br /> + 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 15%. <br /> 3. Estimated deep percolation of rainfall is 3.54 inlyr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> F <br /> l!. F <br /> Fj <br /> I <br /> F <br /> Fil <br /> .44 NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> Plate 13 <br /> Fi <br />