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Nitrate Mass Balance Calculation, Parcel 1 <br /> ri <br /> Data Input: <br /> ut:p <br /> ' Effluent Quantity(Q): 5,511 gals/day Concentration Rain (Ne): 1.00 mg/L-N <br /> Effluent Stream (Nw}: 45.00 mg/L-N Denitrification (d): 10.0% <br /> # Site Area (A): 43.28 Acres Deep Perc. of Rain (R): 5.76 inlyr <br /> Waste Loading (W): 1.71 in/yr <br /> Result: <br /> Mass Balance(N j: 10.0 mg/L-N <br /> `j MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 100% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find <br /> AM <br /> t yr day 7.48 gal 1 year 43,560 ftz 1 ft (A) acre <br /> 1.71 inlyr(site) =5,51 1 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-ft)x(12 in/1 ft)x(1 site/43.28 acres) <br /> i <br /> `Fi N,= WNw(l-d)+RN, Hantzsche-Fennemore Equation Nc <br /> W+R <br /> 10.05 mglL-N=((1.71 in/yr x 45 mg/L-N x(1-0.1))+(5.76 intyr x 1mg/L-N))/(1.71 inlyr+5.76 in/yr) <br /> �3 <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate (10.05 mg/L-N). <br /> W=Uniform waste water loading for study area (in/yr) (1.71 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 (10%). <br /> R= Uniform deep percolation of rainfall (5.76 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 10%. <br /> 3. Estimated deep percolation of rainfall is 5.76 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> F' <br /> k <br /> NEIL O. ANDERSON <br /> "A4 AN D ASSOCIATES <br /> plate 11 <br />