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Data Input: <br /> Effluent Quantity(Q): 1,520gals/day Concentration Rain(Nb): 1.0 mg/L-N <br /> Effluent Stream (NW): 35mg/L-N Denitrification (d): 35% <br /> Site Area (A): 13.46Acres Deep Perc. of Rain (R): 3.21 in/yr <br /> Waste Loading (W): 1.52 in/yr <br /> Result: <br /> Mass Balance(N,): 8.0 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10 mg/L-N <br /> Percent of MCL Nitrate as N 80% <br /> Equations: <br /> (W) in = (Q) aal x 1 W x 365 day x 1 acre x 12 in x 1 Find W <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre <br /> 1.52 In/yr(site)=1,520 gal/day x(I cu-ft/7.48gals)x(365 days/1 year)x(I acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/13.46 acres) <br /> NC-WNW 1-d( )+RNA Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 6.0 mg/L-N=((1.52 in/yr x 35 mg/L-N x(1-0.35))+(3.21 in/yr x Img/L-N))/(1.52 in/yr+3.21 in/yr) <br /> Variables: <br /> Nc = Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(8.0 mg/L-N). <br /> W = Uniform waste water loading for study area (in/yr)(1.52 inches/year). <br /> Nw =Total nitrate-N concentration of waste water percolate(35 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (35%), based on significant clay at. <br /> R = Uniform deep percolation of rainfall (3.21 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 35 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 3.21 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br />