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Nitrate Mass Balance Calculation Maximum Load Data Input: Students/Facality: 740 people Waste Loading (W): 10.57 in/yr Student/staff:Gal lons/person/day: 15 gals/day Site Area (A): 10.2 Acres Concentration Rain (Nb): 0.17 mg/L-N Denitrification (d): 25.0% Use Constant, 5 days/7days: 0.714 Deep Perc. of Rain (R): 7.86 in Effluent Quantity (Q): 8,000 gals/day Effluent Stream (N,): 23.00 mg/L-N Result: Mass Balance (N.): 9.97 mg/L-N MCI-Drinking Water: 10. mg/L-N Percent of Maximum Drinking Water Standard: 100% Equations: (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acres NG = WN-(l-d)+RN,, W+R Variables: Nc=Average nitrate-N concentration (mg/1) of combined effluent and rainfall percolate (9.97 mg/L-N) W = Uniform waste water loading for study area (in/yr) (10.57 inches/year). Nw=Total nitrate-N concentration of waste water percolate (23 mg/L-N).,- d = Fraction of nitrate-N loss due to denitrification in the soil (25%). R = Uniform deep percolation of rainfall (7.86 in/yr). Nb = Background nitrate-N concentration of rainfall (0.17 mg/L-N). Assumptions: 1. Nitrate-N concentration of waste stream based on estimate of 23 mg/L-N. Assumption based on work from Hantzsche and Finnemore, 1991. 2. Fraction of nitrate-N loss due to Denitrification in the soil is assumed to be 25%. Assumption based on work from Hantzsche and Finnemore, 1991. 3. Estimated deep percolation of rainfall is 7.86 in/yr, see Worksheet No. 1. 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by Hantzsche and Fennemore, 1991. apt It r ti NEIL O.ANDERSON&ASSOC.,INC. N GEOIECHNCAL SERVICES-ENGINEERNG LABORATORIES Z m 22 Houston Ln.Lodl,CA 95240 O (209)397-3761 q �r '�SOG PLATE 12