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yNitrate Mass Balance Calculation" <br /> Whiskey Slough Marina <br /> Data Input: <br /> Effluent Quantity(Q): 1,722 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream(N,,,): 45.00 mg/L-N Denitrification (d): 35.0% <br /> Site Area(A): 26.00 Acres Deep Perc. of Rain (R): 4.00 in/yr <br /> Result: <br /> Mass Balance(Nj: 6.1 mg/L-N Waste Loading (W): 0.89 in/yr <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 61% <br /> Equations: <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 /> 0.89intyr(site) =1,722 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x (1 acre 143,560 sq-R)x(12 in/1 R)x(1 site/26 acres) <br /> Hantzsche-Fennemore Equation(NdN�= WNw(1-d)+RN„ <br /> ✓ W+R <br /> n a6 f- <br /> 6.14 <br /> 6.14 mg/L-N=((0.89 in/yr x 45 mg/L-N x(1-0.35))+(4 irVyr x 1 mg/L-N))/(0.69 in/yr+4 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate(6.14 mg/L-N). <br /> W=Uniform waste water loading for study area (in/yr)(0.89 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 (4 in/yr). <br /> 0 <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 35%. <br /> 3. Estimated deep percolation of rainfall is 4 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> '44 NEIL O. ANDERSON <br /> A N D A S 5 0 C I A T E 5 <br /> Plate 10 <br />