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Nitrate Mass Balance Calculation <br /> (Proposed Residence and Detached Pool House) <br /> Data Input: <br /> Effluent Quantity(Q): 700 gals/day <br /> Effluent Stream ft): 35.00 mg/L-N <br /> Site Area(A): 1.50 Acres <br /> Concentration Rain(Nb): 1.00 mg/L-N <br /> Denitrification(d): 10.0% <br /> Deep Perc.of Rain(R): 2.54 in/yr <br /> Result: <br /> Mass Balance(Nj: 22.7mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 227% <br /> Waste Loading(W): 6.27 in/yr <br /> Equations: <br /> Find <br /> (W) in = (Q) gal x 1 W x 365 day x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ftz 1 ft (A)acre <br /> 6.27 in/yr(site)=700 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/1.5 acres) <br /> Nc= WNW 1-d +RN <br /> \f/+R - Hantzsche-Fennemore Equation(Nc) <br /> 22.71 mg/L-N=((6.27 in/yr x 35 mg/L-N x(1-0.1))+(2.54 in/yr x 1mg/L-N))/(6.27 in/yr+2.54 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(22.71 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(6.27 inches/year). <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(10%). <br /> R=Uniform deep percolation of rainfall(2.54 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 35 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 2.54 in/yr,see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br /> Irerracon <br />