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01 <br /> 0 <br /> Nitrate Mass Balance Calculation <br /> Acreage: 2.0 <br /> ri <br /> Data input: <br /> Resident Use: Gallons/person/day: 50 galslday Waste Loading (W): 1.68 in/yr r <br /> Persons: 5 Site Area (A): 2.0 Acres <br /> Effluent Quantity (Q): 250 gals/day Concentration Rain (Nb): 0.17 mg/L-N <br /> F1 Effluent Stream (N,): 45.00 mg/L-N Denitrification (d): 25.0% ' <br /> Deep Perc. of Rain (R): 2.45 in <br /> � Result: <br /> Mass Balance(N�): 15.8 mg/L-N <br /> MCL Drinking Water: 10. mg/L-N <br /> Percent of Maximum <br /> Drinking Water Standard: 138% <br /> F-i Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> 0 yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acres <br /> N = WN 1-d +RN <br /> W+R <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(13.83 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr) (1.68 inches/year). <br /> P 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 (2.45 in/yr). <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, 1991. <br /> 1 <br /> 2. Fraction of nitrate-N loss due to Denitrification in the soil is assumed to be 25%. <br /> Assumption based on work from Hantzsche and Finnemore, 1991. <br /> F13. Estimated deep percolation of rainfall is 2.45 in/yr, 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, 1991. <br /> Q pERBpy <br /> NEIL O.ANDERSON&ASSOC.,INC. N <br /> C601EpiNCAL SERVICES B1f HU RNG LAROMTORIES X <br /> ' 72 FbuabnLn.Lodl.CA DW O <br /> t=)367-37M t 0``r <br /> �i <br /> PLATE 5 <br />