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I) <br /> F! Nitrate Mass Balance Calculation for 2.0-acreP arcel for a 6-Bedroom Residence <br /> F <br /> Data Input: <br /> t I <br /> w Effluent Quantity(Q): 420 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream (N,N) ,mg - Denitrification (d): 25.0% <br /> Site Area 0. 2.08 Acres Deep Perc. of Rain (R): 7.95 in Lr <br /> f <br /> Result: <br /> Mass Balance(N�): 9.3 mg/L-N <br /> !7 MCL Drinking Water Nitrate as N: 10.0 mg/L-N Waste Loading (W): 2.71 in/yr <br /> t Percent of MCL Nitrate as N 93% <br /> Equations: <br /> (W) in = (Q) gal x 1 W x 365 day x 1 acre x 12 in x 1 Find <br /> F, yr day 7.48 gal 1 year 43,560 ft2 1 ft (A)acre <br /> 1 <br /> -- r <br /> 2.71 in/yr(site) =420 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-tt)x(12 in 11 ft)x(1 site 12.08 acres) <br /> f ; N,= WN-(1-d)+RNt, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 9.34 mg/L- _((2.71 in/yr x 45 mg/L-N x(1-0.25))+(7.95 in/yr x 1mg/L-N))/(2.71 in/yr+7.95 in/yr) <br /> ariables: � <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(9.34 mg/L-N). <br /> W=Uniform waste water loading for study area (in/yr) (2.71 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 (25%). <br /> R= Uniform deep percolation of rainfall (7.95 in/yr). <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 45 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 7.95 in/yr, see deep percolation of rain worksheet: <br /> F4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> s � <br /> Fill! <br /> I <br /> I <br /> NEIL O. ANDERSON <br /> F1 "044 A N D A S S O C I A T E S <br /> Plate 8 <br />