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Nitrate Mass Balance Calculation: <br /> Standard Septic System (Nw = 51.8 mg/L-N) <br /> Data Input: <br /> f Concentration Rain(Nb): 1.00 mg/L-N <br /> k Effluent Quantity(Q): 18.4 galslday Denitrification (d): 35,0% <br /> Effluent Stream (N,,,): 51.8 mg/L-N Deep Perc.of Rain (R): 1.07 in/yr <br /> Site Area (A): 0.6 Acres Waste Loading (W): 0.40 in/yr <br /> Result: <br /> Mass Balance(N�): 9.9mg1L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 99% <br /> Equations: <br /> IIS <br /> (W) in = (Q) gal x 1 ft3 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 /> L=I <br /> 0.4 in/yr(site) =18 gailday x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ff)x(1 site/0.62 acres) <br /> NE= WN 1-d +RN Hantzsche-Fennemore Equation Nc <br /> W+R <br /> 9.87 mg/L-N=((0.4 in/yr x 59.8 mg/L-N x(1-0.35))+(1.07 in/yr x 1mg1L-N))1(0.4 in/yr+1,07 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate(9.87 mg/L-N). <br /> W= Uniform waste water loading for study area(inlyr)(0.4 incheslyear). <br /> Nw=Total nitrate-N concentration of waste water percolate(51.8 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil(35%). <br /> FR=Uniform deep percolation of rainfall(1.07 in/yr). <br /> Nb=Background nitrate-N concentration of rainfall (1 mg/L-N). <br /> Assumptions: <br /> F1. Total nitrogen concentration of waste stream based on estimate of 51.8 mg/L-N. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> 3. Estimated deep percolation of rainfall is 1.07 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> F- <br /> F <br /> T <br /> F <br /> F pERSO� <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> s <br /> + MOTE CN 1dCAL fiERVICES-EMGIHEERNG LABOMTOMEB X W <br /> 22 N U—b Ln.L141. A 9520 4 R <br /> (20(]ET-MM * `4 <br /> SSpG <br /> F <br /> Plate 5 <br />