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Nitrate Mass Balance Calculation: <br /> Standard Septic System (2.0 Acre Parcel) <br /> Data Input: <br /> Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Quantity(Q): 490 gals/day Denitrification (d): 10.0% <br /> Effluent Stream(N W): 45 mg/L-N Deep Perc. of Rain (R): 5.01 in/yr <br /> Site Area (A): 2.0 Acres Waste Loading (W): 3.29 in/yr <br /> Result: <br /> Mass Balance(N,,): 16.7 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 167% <br /> Equations: <br /> (W) in = (Q) gal x 1 W x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 qal 1 year 43,560 ft2 1 ft (A) <br /> 3.29 in/yr(site) =490 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/2 acres) <br /> N,= WN-(1-d)+RN,, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 16.67 mg/L-N=((3.29 in/yr x 45 mg/L-N x(1-0.1))+(5.01 in/yr x 1mg1L-N))/(3.29 in/yr+5.01 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate (16.67 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr)(3.29 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 (5.01 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 5.01 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> pE RSO <br /> NEIL O.ANDERSON&ASSOC.,INC. D <br /> GEOTECHNICAL SERVICES-ENGINEERNG LAB 0RA10RIES Z W <br /> 22 H0usb0L,LOE1,CA 9S20 O '� <br /> (za91]9anm q �� <br /> 'TSO <br /> Plate 9 <br />