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Nitrate Mass Balance Calculation Ehlers Property (APN_ 055-070-21) - Existing Grain Facility/Proposed Hemp Facility 9220 West Highway 12, Lodi, San Joaquin County, California Terracon Project No. NA217019 Data Input: Effluent Quantity (Q): 221 gals/day Effluent Stream (NW): 85.00 mg1L-N Site Area (A): 5.43 Acres Concentration Rain (Nb): 1.00 mg/L-N Denitrification (d): 15.0% Deep Perc. of Rain (R): 11.55 in/yr Result: Mass Balance (NJ: 4.2 mg/L-N MCL Drinking Water Nitrate as N: 10.0 mg/L-N Percent of MCL Nitrate as N 42% Waste Loading (W): 0.55 in/yr Equations: Find W� (W) in = (Q) gal x 1 ft' x 365 day x 1 acre x 12 in x 1 yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) acre 0.55 in/yr(site) =221 gal/day x (1 cu -ft/ 7.48 gals) x (365 days/ 1 year) x (1 acre 143,560 sq -ft) x (12 011 ft) x (1 site / 5.43 acres) N� =WNW 1( d)+RNb W+R - Hantzsche-Fennemore Equation (Nc) 4.22 mg/L-N = ((0.55 in/yr x 85 mg/L-N x (1-0.15))+(11.55 in/yr x 1mg/L-N))/(0.55 in/yr+11.55 in/yr) Variables: Nc = Average nitrate -N concentration (mg/1) of combined effluent and rainfall percolate (4.22 mg/L-N). W = Uniform waste water loading for study area (in/yr) (0.55 inches/year). Nw = Total nitrate -N concentration of waste water percolate (85 mg/L-N). d = Fraction of nitrate -N loss due to denitrification in the soil (15%). R = Uniform deep percolation of rainfall (11.55 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 85 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 11.55 in/yr, see deep percolation of rain worksheet. 4. Assume background nitrate -N concentration of rainfall is 1 mg/L-N. 1rerracon