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Nitrate Mass Balance Calculation Munsch Property (APN: 027-020-16), 3-Bedroom/2-Bedroom Residences 16133 N. Moore Road, Lodi, San Joaquin County, California Terracon Project No. NA217092 Data Input: Effluent Quantity (Q): 350 gals/day Effluent Stream (NW): 40.00 mg/L-N Site Area (A): 1.47 Acres Concentration Rain (Nb): 1.00 mg/L-N Denitrification (d): 15.0% Deep Perc. of Rain (R): 8.90 in/yr Result: Mass Balance (N,): 9.7 mg/L-N MCL Drinking Water Nitrate as N: 10.0 mg/L-N Percent of MCL Nitrate as N 97% Waste Loading (W): 3.20 in/yr Equations: Find W (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 yr day 7.48 gal 1 year 43,560 ftz 1 ft (A) acre 3.2 in/yr (site) =350 gaYday 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/ 1.47 acres) N, = WNW 1( d)+RN,, W+R - Hantzsche-Fennemore Equation (Nc) 9.73 mg/L-N = ((3.2 in/yr x 40 mg/L-N x (1-0.15))+(8.9 in/yr x 1 mg/L-N))/(3.2 in/yr +8.9 in/yr) Variables: Nc = Average nitrate -N concentration (mg/1) of combined effluent and rainfall percolate (9.73 mg/L-N). W = Uniform waste water loading for study area (in/yr) (3.2 inches/year). Nw = Total nitrate -N concentration of waste water percolate (40 mg/L-N). d = Fraction of nitrate -N loss due to denitrification in the soil (15%). R = Uniform deep percolation of rainfall (8.9 in/yr). Nb = Background nitrate -N concentration of rainfall (1 mg/L-N). Assumptions: 1. Total nitrogen concentration of waste stream based on estimate of 40 mg/L-N. 2. Fraction of nitrate -N loss due to denitrification in the soil is assumed to be 15%. 3. Estimated deep percolation of rainfall is 8.9 in/yr, see deep percolation of rain worksheet. 4. Assume background nitrate -N concentration of rainfall is 1 mg/L-N. Irerracon