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Nitrate Mass Balance Calculation <br /> Proposed ADU <br /> 11065 North Alpine Road, Stockton, San Joaquin County, California <br /> Terracon Project No. NA267068 <br /> Data Input: <br /> Effluent Quantity(Q): 200 gals/day <br /> Effluent Stream (N,,): 45.00 mg/L-N <br /> Site Area (A): 1.50 Acres <br /> Concentration Rain (Nb): 1.00 mg/L-N <br /> Denitrification (d): 35.0% <br /> Deep Perc. of Rain (R): 5.74 in/yr <br /> Result: <br /> Mass Balance(N,,): 7.7 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 77% <br /> Waste Loading (W): 1.79 in/yr <br /> Equations: <br /> Find W <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A)acre <br /> 1.79 in/yr(site) =200 gal/day x(1 cu-ft/7.48 gals)x(365 days/1 year)x(1 acre 143,560 sq-ft)x(12 in/1 ft)x(1 site/1.5 acres) <br /> Nc = WNW 1-d +RNb <br /> W+R Hantzsche-Fennemore Equation (NO <br /> 7.72 mg/L-N= ((1.79 in/yr x 45 mg/L-N x(1-0.35))+(5.74 in/yr x 1mg/L-N))/(1.79 in/yr+5.74 in/yr) <br /> Variables: <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and rainfall percolate (7.72 mg/L-N). <br /> W = Uniform waste water loading for study area (in/yr)(1.79 inches/year). <br /> Nw=Total nitrate-N concentration of waste water percolate (45 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (35%). <br /> R= Uniform deep percolation of rainfall (5.74 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 45 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 5.74 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br />