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Nitrate Mass Balance Calculation <br />Lease Property Existing Residence and Proposed Modular (APN: 005-370-02) <br />3055 East Forest Lake Road, Acampo, San Joaquin County, California <br />Terracon Project No. NA217090 <br />Data Input: <br />Effluent Quantity (Q): 400 gals/day <br />Effluent Stream (N,v): 40.00 mg/L-N <br />Site Area (A): 2.92 Acres <br />Concentration Rain (Ne): 1.00M91L-N <br />Denitrification (d): 25.0% <br />Deep Perc. of Rain (R): 8.09 in yr <br />Result: <br />Mass Balance (N,): 6.4 mglL-N <br />MCL Drinking Water Nitrate as N: 10.0 mglL-N <br />Percent of MCL Nitrate as N 64% <br />Waste Loading (W): 1.84 in yr <br />Equations: <br />Find W <br />(W) in = (Q) gal x 1 fV 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 />1.84 in/yr (sde) =400 gaYdayx (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 sie/2.92 acres) <br />N,= WN„ 1-d,( )+RNti_ <br />W+R Hardzsche-Fennemore Equation (Nc) <br />6.38 mglL-N = ((1.84 irdyr x 40 mg/L-N x (1-0.25))+(8.09 in yr x 1mg/L-N))/(1.84 in/yr+8.09 in yr) <br />Variables: <br />Nc =Average nitrate -N concentration (mg/1) of combined effluent and rainfall percolate (6.38 mg/L-N). <br />W = Uniform waste water loading for study area (in/yr) (1.84 inches/year). <br />Nw = Total nitrate -N concentration of waste water percolate (40 mg1L-N). <br />d = Fraction of nitrate -N loss due to denitrification in the soil (25%). <br />R = Uniform deep percolation of rainfall (8.09 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 40 mg/L-N. <br />2. Fraction of nitrate -N loss due to denitrification in the soil is assumed to be 25%. <br />3. Estimated deep percolation of rainfall is 8.09 in/yr, see deep percolation of rain worksheet. <br />4. Assume background nitrate -N concentration of rainfall is 1 mg/L-N. <br />1 rerracon <br />