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1 ' <br /> Nitrate Mass Balance Calculation <br /> Parcel 1 <br /> Data Input: <br /> Effluent Quantity(Q): 350 gals/day Concentration Rain(No- 1.00 mglL-N <br /> Effluent Stream(N,.): 45.00 mg/1.-IV Denitrification(d): 35.0% <br /> Site Area(A): 2.09 Acres Deep Perc.of Rain(R): 6,00 inlyr <br /> Result: <br /> Mass Balance(NT):'8.9 g/V-W Waste Loading (VII); 2.34 in/yr <br /> MCI.Drinking Water Nitrate ss N. 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 89% <br /> Equations: <br /> (W) Ir = (Q) Rall x 'I f? x 36. . 5 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 gal 1 year 43,560 fig 1 ft (A)acre <br /> 2,34 Irlyr(site)=350 gal/dayx(I cu-It/7.46 gals)x(365 day$1 f year)x(9 acre/43,580 aq-ft)x(92 in/f ft)x(I site/2.01 acres) <br /> N,= WN,jl-d)+RNy HanLscH Po amore Equation Ne <br /> W+R <br /> 8.93 mg/L-N=((2.34 in/yr x 45 mglL-N x(9-0.35))+(6 in/yr x 1m91L-1V))/(2.34 inlyr+6 inlyr) <br /> Variables: <br /> No=Average nitrate-N concerdratlon(mg/l)of combined effluent and rainfall percolate (8.93 m8/L-N). <br /> W=Uniform waste water loading for study area(iri/yr) (2.34 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(35%). <br /> R=Uniform deep percolation of rainfall(6 in/yO. <br /> 0 <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 46 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> 3. Estimated deep percolation of rainfall is 8 in/yr, see deep percolation.of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L N. <br /> I <br /> NEIL O. ANDERSON <br /> A N D A 9 S 0 C I A 7 E S <br />