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Nitrate Mas Balance Calculation: Standard 5 <br /> tem <br /> Data Input: <br /> Effluent Quantity(Q): 2,714 gals/day Concentration Rain (Nb): 0.17 mg/L-N <br /> Effluent Stream (NW): 45.00 mg1L-N Denitrification (d): 15.0%, <br /> Waste Loading (W): 10.42 in/yr Deep Perc. of Rain (R): 5.01 in/yr <br /> Site Area (A): 3.5 Acres <br /> Result: <br /> Mass Balance(Nj: 25.9 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg1L-N <br /> Percent of MCL Nitrate as N 259% <br /> Equations: <br /> (W in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find W <br /> Yr day 7.48 qal 1 year 43,560 ft2 1 ft (A) <br /> 10.42 in/yr(site) =2,714 gal/day x(1 cu-ff/7.48 gals)x (365 days/i year)x (1 acre 143,560 sq-R)x (12 in/i ft)x(i site 13.5 acres) <br /> i <br /> N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation (Nc) j <br /> W+R 1 <br /> 25 89 mg/L-N= ((10.42 in/yr x 45 mg/L-N x (1-0.15))+(5.01 in/yr x 0.17mg/L-N))1(10.42 in/yr+5.01 in/yr) 1! <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (25.89 mg/L-N). i <br /> W= Uniform waste water Loading For study area (in/yr) (10.42 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 (15%). <br /> R= Uniform deep percolation of rainfall (5.01 in/yr). t <br /> Nb= Background nitrate-N concentration of rainfall (0.17 mg/L-N). <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 45 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 15%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. ' <br /> i 3. Estimated deep percolation of rainfall is 5.01 inlyr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by ' <br /> Hantzsche and Fennemore, 1992. <br /> i <br /> - - i <br /> { 40 so <br /> F S � <br /> NEIL O.ANDERSON S AM)C.,INC. <br /> GEOIEQNGAL SEAvCE I-ENOINEERNG LABORATORIES X <br /> 22 L..LcdI.CA 96244 <br /> 120YI 1ST•]T BS 7X500 ' . <br /> PLATE 9 <br /> J <br /> 1 <br />