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4 <br /> ` Nitrate Mass Balance Calculation` <br /> Primary Dwelling Unit <br /> Data Input: <br /> Effluent Quantity(Q): 300 gals/day Concentration Rain (Nb): 9.00 mg/L-N <br /> Effluent Stream (N,,): 40.00 mg1L-N Denitrification(d): 25.0% <br /> Site Area (A): 2.05 Acres Deep Perc. of Rain (R): 5.60 in/yr <br /> Result: <br /> Mass Balance(N j: 8.5 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mgA--N Waste Loading (VV): 9.97 inlyr <br /> Percent of MCL Nitrate as N 85% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x !Zia. x 1 Find <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre <br /> 1.97 inlyr(site) =300 gallday x(1 cu-ft 17.48 gals)x(365 days/1 year)x(I acre 143,560 sq-ft)x(12 in/1 ft)x(1 site 12.05 acres) <br /> N,= WNw0-d1+RNA Hantzsche-Fennemore Equation Mc <br /> W+R <br /> 8.54 mg1L-N=((1.97 inlyr x 40 mgA--N x(1-0.25))+(5.6 inlyr x 1mg4--N))1(1.97 inlyr+5.6 inlyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mgll)of combined effluent and rainfall percolate(8.54 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr) (1.97 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(40 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil (25%). <br /> R= Uniform deep percolation of rainfall (5.6 inlyr). <br /> Nb=Background nitrate-N concentration of rainfall(1 mg/L-N). <br /> Assumptions: <br /> 1. Total nitrogen concentration of waste stream based on estimate of 40 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br />+. 3. Estimated deep percolation of rainfall is 5.6 inlyr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> { <br /> I <br /> NEIL O. ANDERSON <br /> AN D ASSOCIATES <br /> F late 2 <br /> R <br />