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Nitrate Mass Balance Calculation: Engineered Se^tic System <br /> � Y <br /> Data Input: <br /> Effluent Quantity(Q): 2,714 gals/day Concentration Rain (Nb): 0.17 mg/L-N <br /> 'I Effluent Stream (N,),. 17.00 mg/L-N Denitrification (d): 35.0% <br /> Waste Loading (W): 10.42 in/yr ; Deep Perc. of Rain (R): 5.01 in/yr <br /> Site Area (A): 3.5 Acres <br /> Result: <br /> Mass Balance(N j: 7.5 mg/L-N <br /> MCL Drinking Water Nitrate as N: 10.0 mg/L-N <br /> Percent of MCL Nitrate as N 75% <br /> Equations: <br /> (W) in = (Q) gal x 1 ft3 x 365 day x 1 acre x 12 in x 1 Find W I <br /> yr day 7.48 gal 1 year 43,560 ft2 1 ft (A) <br /> 10-42 intyr(site) =2,714 gal/day x(1 cu-ft/7.48 gats)x(365 days/i year)x(1 acre 143,560 sq-tt)x(12 in/I ft)x(1 site/3.5 acres) <br /> l <br /> N,= WN-(1-d)+RNH Hantzsche-Fennemare EquationLN� <br /> 7.52 mg/L-N=((10.42 in/yr x 17 mg/L-N x(1-0.35))+(5.01 in/yr x 0.17mg/L-N))/(10.42 intyr+5.01 in/yr) '-�-. ' <br /> Variables: l <br /> Nc=Average nitrate-N concentration (mg/1)of combined effluent and.rainfall percolate (7.52 mg/L-N). <br /> W= Uniform waste water loading for study area (in/yr) (10.42 inches/year). <br /> Nw= Total nitrate-N concentration of waste water percolate (17 mg/L-N). <br /> d = Fraction of nitrate-N loss due to denitrification in the soil (35%). <br /> R = Uniform deep percolation of rainfall (5.01 inlyr). <br /> i Nb= Background nitrate-N concentration of rainfall (0.17 mg/L-N). <br /> Assumptions: <br /> 1. Nitrate-N concentration of waste stream based on estimate of 17 mg/L-N. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 2. Fraction of nitrate-N loss due to denitrification in the soil is assumed to be 35%. <br /> Assumption based on work from Hantzsche and Finnemore, 1992. <br /> 3. Estimated deep percolation of rainfall is 5.01 in/yr, see deep percolation of rain worksheet. <br /> 4. Assume background nitrate-N concentration of rainfall is 0.17 mg/L-N based on range by <br /> Hantzsche and Fennemore, 1992. <br /> i <br /> f <br /> I <br /> �p E R{O <br /> p h <br /> NEIL O.ANDERSON&ASSOC.,INC. <br /> (E07ECHMCAL SERVICEa-EMINEERNO LABORATORIES Z <br /> 22 Houston Ln.LOCI,CA 55240 d A. <br /> 12m 13ET•STVI <br /> El <br /> • SSO <br /> Plate 10 <br />_ r <br />