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Nitrate Mass Balance Calculation: <br /> Standard Septic System (Nw =75 mg/L-N) <br /> Data Input: <br /> Concentration Rain(Nb): 1.00 mg/L-N <br /> Effluent Quantity(Q): 436 gals/clay " Denitrificafion(d): 15.0% <br /> Effluent Stream(N,):'75 mg/L-N Deep Perc.of Rain (R): 5.01 in/yr . <br /> Site Area(A): 14.0 Acres Waste Loading (W): 0,42 in/yr <br /> Result: r <br /> Mass Balance <br /> MCL Drinking Water Nitrate as N:,f 1-0 0 mg/L-N <br /> Percent of MCL Nitrate as <br /> Equations: ` <br /> (W) in = (0) gal x 1 W x 365 day x 1 acre x 12 in x 1 Find <br /> yr day 7.48,gal 1 year 43,560 ft2 1 ft (A) <br /> 0.42 irVyr(site) =436 gai/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre/43,560 sq-fit)x(12 in/1 ft)x(1 site 114 acres) <br /> N°= WN 1-d +RN? Hantzsche-Fennemore Equation(Nc) <br /> W+R <br /> 5.84 mg/L-N=((0.42 in/yr x'75 mg/L-'N x(1-0.15))+(5.01 in/yr x 1 mg/L-N))l(0.42 in/yr+5.01 inlyr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate (5.84 mg/L-N). <br /> W= Uniform waste water loading for study area(in/yr)(0".42 incheslyear). <br /> Nw=Total nitrate-N concentration of wastewater percolate (75 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 inlyr). <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 75 mg/L-N.' <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 15%. <br /> 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 1 mg/L-N. <br /> NEIL'O.ANDERSON&ASSOC.,INC. � M <br /> .MOM CN/SCAL SERACES-ENGINEERNG LABORATORES x r <br /> i - - 12N—W,L,.L,dl,CA 9E2tl O 1 <br /> •. (209116 T-RM Y �f <br /> Plate 2 <br />