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Proposed Septic System - S1ama <br /> Data Input: <br /> Effluent Quantity in GPD(Q): 748 Gal/Day <br /> Effluent Stream in mg1L-N (N„): 63.8 mg/L-N <br /> Site Area in Acres (A) 10 Acres <br /> Concentration in Rain in mg/L-N (Nn 1 mg/L-N <br /> Denitrification in percent(d): 25 % <br /> Deep Perc. Of Rain in inches/yr(R ): 7.85 In/yr <br /> Calculations: <br /> Wi=Q x Cu-Ft(Gal x(DaysNr)x (Sq-Ft/Acre x Inches/Ft) x (1/A) <br /> Wi=748 x (117.48)x 365 x (1/43,560)x 12)x(1/10)= 1,006 <br /> Nc = Wi'N,,,(1-d)+RN,. <br /> Wi+R <br /> N�= 1.006'63.811-0.25)-(7.85'1) =6.32 <br /> 1.006+7.85 <br /> Result: <br /> Uniform waste water loading (Wi) 1.01 Inches/Yr <br /> Mass Balance m nri (Nj: 6.32 mg)L-N <br /> Total Nitrate Mass 109 lbs <br /> MCL Drinking Water N as N: 10 m /L-N <br /> Perecnt of MCL Nitrate as N 63 % <br /> Variables: <br /> No=Average nitrate-N concentration (mg/L)of combined effluent and ranfa4 percolate <br /> Wi = Uniform waste water loading for study area (in/year) <br /> Nw = Total nitrate-N concentration of waste water percolate (mg/L-N) <br /> d = Fraction of nitrate-N loss due to denitrification in the soil <br /> R = Uniform deep percolaton of rainfall (incheslyr) <br /> Nb= Background nitrate-N concentration of rainfall (mg/L-N( <br /> Assumptions: <br /> Res. Effluent Stream in mg/L-N (N,): 44 mg/L-N <br /> Concentrabion in Rain in mg/L-N (Nb 1 mg/L-N <br /> Denitrification in percent(a): 25 % <br />