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Nitrate Mass Balance Calculation <br /> Soares Property - Revised 03-10-20 <br /> Proposed 3 Bedroom Residence <br /> Data Input: <br /> Effluent Quantity(Q): 200 gals/day <br /> Effluent Stream(N,„): 40.00 mg/L-N <br /> Site Area(A): 0.81 Acres <br /> Concentration Rain(Nb): 1.00 mgt-N <br /> Denitrification(d): 25.0% <br /> Deep Perc.of Rain(R): 5.84 in/yr <br /> Result: <br /> Mass Balance(Nj: 11.5 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 115% <br /> Waste Loading(W): 3.32 in/yr <br /> Equations: <br /> Find(W) <br /> (W) h- = (Q) gal x 1 f13 x 365 day x 1 acre x 12-h- x 1 <br /> yr day 7.48 gal 1 year 43,560 ftz 1 ft (A)acre <br /> 3.32 in/yr(site)=200 gat/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/0.81 acres) <br /> Ne= WNL 1-d +RN <br /> W+R Hantzsche-rennemore Equation(W <br /> 11.51 mg/L-N=((3.32 in/yr x 40 mg/L-N x(1-0.25))+(5.84 in/yr x 1mg/L-N))/(3.32 in/yr+5.84 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration(mg/1)of combined effluent and rainfall percolate(11.51 mg/L-N). <br /> W=Uniform waste water loading for study area(in/yr)(3.32 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate(40 mg/L-N). <br /> d=Fraction of nitrate-N loss due to denitrification in the soil(25%). <br /> R=Uniform deep percolation of rainfall(5.84 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 40 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 5.84 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 />