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Nitrate Mass Balance Calculation <br />JPM (APN 191-270-21), Phase I - Septic System 1 <br />1410 Frewert Road, Lathrop, San Joaquin County, California <br />Terracon Project No. NA227026 <br />Data Input: <br />Effluent Quantity (Q): 1,275 gals/day <br />Effluent Stream (Nw): 85.00 mg/L-N <br />Site Area (A): 92.39 Acres <br />Concentration Rain (Nb): 1.00 mg/L-N <br />Denitrification (d): 15.0.1 <br />Deep Perc. of Rain (R): 5.58 in/yr <br />Result: <br />Mass Balance (NJ: 3.3 m91L-N <br />MCL Drinking Water Nitrate as N: 10.0mg/L-N <br />Percent of MCL Nitrate as N 33% <br />Waste Loading (W): 0.19 ui/yr <br />Equations: <br />Fuld <br />(W) in = (Q) gal x 1 W x63 5 da Y x 1 acre x 12 in x 1 <br />yr day 7.48 gal 1 year 43,560 ftz 1 ft (A) acre <br />0.19 in/yr (sue) =1,275 ga4day 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 / 92.39 acres) <br />N�= WNW 1-d+RN <br />VV+R Hantzsche-Fennemore Equation (NO <br />3.29 mg/L-N = ((0.19 kVyr x 85 mg/L-N x (1-0.15))+(5.58 in/yr x 1mg/L-N))/(0.19 u7/yr+5.58 in/yr) <br />Variables: <br />Nc = Average nitrate -N concentration (mgA) of combined effluent and rainfall percolate (3.29 mg/L-N). <br />W = Uniform waste water loading for study area (in/yr) (0.19 inches/year). <br />Nw = Total nitrate -N concentration of waste water percolate (85 mg/L-N). <br />d = Fraction of nitrate -N loss due to denitrification in the soil (15%). <br />R = Uniform deep percolation of rainfall (5.58 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 85 mg/L-N. <br />2. Fraction of nitrate -N loss due to denitrification in the soil is assumed to be 15%. <br />3. Estimated deep percolation of rainfall is 5.58 in/yr, see deep percolation of rain worksheet. <br />4. Assume background nitrate -N concentration of rainfall is 1 mg/L-N. <br />1rerracon <br />