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ll <br /> Nitrate Mass Balance Calculation: <br /> Standard Septic System <br /> Data input: <br /> Effluent Quantity(Q): 193.9 gals/day Concentration Rain (Nb): 1.00 mg/L-N <br /> Effluent Stream(N,,): 35.0 mg/L-N Denitrification (d): 25.0% <br /> Site Area (A): 1.0 Acres Deep Perc. of Rain (R): 1.07 in/yr <br /> Waste Loading (W): 2.61 in/yr <br /> C, <br /> Result: <br /> I <br /> Mass Balance{N.): 18.9 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 189% <br /> L ! Equations: <br /> 1 <br /> (W) in = (Q) gal x 1 ft3 x 36- 5 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48 qal 1 year 43,560 ftZ 1 ft (A) <br /> 2.61 i r slte =194 al/da x i cu-ft/7.48 gals)x 365 da s/1 ear x 1 acre 4 - <br /> n/y ( ) g y ( g } ( y year) { / 3,560 sq-ft)x(120/1 ft)x(1 site/1 acres) <br /> N,= WN-(l-d)+RN,, Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> F18.9 mg/L-N=((2.61 in/yr x 35 mg/L-N x(1-0.25))+(1.07 in/yr x 1mg/L-N))/(2.61 in/yr+1.07 infyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(18.9 mg/L-N). <br /> fl <br /> W= Uniform waste water loading for study area (in/yr)(2.61 inches/year). <br /> I <br /> Nw=Total nitrate-N concentration of waste water percolate(35 mg/L-N). <br /> d= Fraction of nitrate-N loss due to denitrification in the soil(25%). <br /> Uniform dee <br /> R= p percolation of rainfall (1.07 in/yr). , <br /> Nb=Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> F <br /> Assumptions: <br /> Fil1. Total nitrogen concentration of waste stream based on estimate of 35 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 25%. <br /> 3. Estimated deep percolation of rainfall is 1.07 inlyr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> I <br /> 6 ` <br /> i <br /> H <br /> F1 <br /> NEIL O.ANDERSON ASSOC.,INC. w <br /> s <br /> fEOTECNNICAL SERVICER-ENGINEERING LABOPnTaFSE5 Y A <br /> TZ Nouamn Ln.Lo4i.CA 8S=a Q <br /> rzre��i-sro 'sau��F i <br /> Plate 5 <br /> N <br /> h <br />