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Nitrate Mass Balance Calculation <br />Morada Produce (APN 105-040-22) - Septic Systems 1, 2, 3 and 4 (Peak) <br />500 N. Jack Tone, Stockton, San Joaquin County, California <br />Terracon Project No. NA217014 <br />Data Input: <br />Effluent Quantity (Q): 12,311 gals/day <br />Effluent Stream (Nw): 75.00 mg/L-N <br />Site Area (A): 64.13 Acres <br />Concentration Rain (Nb): 1.00 mg/L-N <br />Denitrification (d): 30.0% <br />Deep Perc. of Rain (R): 7.79 in/yr <br />Result: <br />Mass Balance (Nc ): 13.8 mg/L-N <br />MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br />Percent of MCL Nitrate as N 138% <br />Waste Loading (W): 2.58 in/yr <br />Equations: <br />Find (W) <br />(W) in = (Q) gj 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 />2.58 in/yr (site) =12,311 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 /64.13 acres) <br />NI c = WN (1-d)+RN,, <br />1R -FR <br /> Hantzsche-Fennemore Equation (Nc) <br />13.82 mg/L-N = ((2.58 in/yr x 75 mg/L-N x (1-0.3))+(7.79 in/yr x 1mg/L-N))/(2.58 in/yr +7.79 in/yr) <br />Variables: <br />Nc = Average nitrate-N concentration (mg/I) of combined effluent and rainfall percolate (13.82 mg/L-1\1). <br />W = Uniform waste water loading for study area (in/yr) (2.58 inches/year). <br />Nw = Total nitrate-N concentration of waste water percolate (75 mg/L-N). <br />d = Fraction of nitrate-N loss due to denitrification in the soil (30%). <br />R = Uniform deep percolation of rainfall (7.79 in/yr). <br />Nb = Background nitrate-N concentration of rainfall (1 mg/L-N). <br />Assumptions: <br />Total nitrogen concentration of waste stream based on estimate of 75 mg/L-N. <br />Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 30%. <br />Estimated deep percolation of rainfall is 7.79 in/yr, see deep percolation of rain worksheet. <br />Assume background nitrate-N concentration of rainfall is 1 mg/L-N. <br />lierracon