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Proposed and existing septic systems - Oak Farm <br /> Data Irout. <br /> Effluent Quantity in GPC (Q): 632 Gal/Day <br /> Effluent Stream in mg/L-N (N.„): 66.8 mg/L-N <br /> Site Area in Acres (A) 31 Acres <br /> Concentration in Rain in mg/L-N (Nb) 1 mg/L-N <br /> Denitrification in percent (d): 25 % <br /> Deep Pero Of Rain in inches/yr(IR ): 7.85 In/yr <br /> Calculations. <br /> Wi=Q x Cu-Ft/Gal x (Days/Yr) x (Sq-FUAcre x Inches/Ft) x (1/A) <br /> Wi=632 x(1!7.48) x 365 x (1/43560) x 12 x(1131) = 0.274 <br /> N, = Wi'N-(l-d)+RN„ <br /> W i+R <br /> N,= 0.274'66.8(1-025)+ 7� 85.1) = 2-66 <br /> 0274+7,85 <br /> Result <br /> Uniform waste water loading (Wi) 0.27 Inches/Yr <br /> Mass Balance in mg/L-N (N,): 2.66 mg/L-N <br /> Total Nitrate Mass 96 Ibs <br /> MCL Drinking Water N as N. 10 mg/L-N <br /> Perecnt of MCL Nitrate as N 27 % <br /> Variables <br /> N,=Average nitrate-N concentration (ni of combined effluent and ranfall 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 percolation of rainfall (inches/yr) <br /> Nb= Background nitrate-N concentration of rainfall (mg/L-N) <br /> Assumptions <br /> Res. Effluent Stream in rng/L-N (N,,,): 44 mg/L-N <br /> Concentration in Rain in mg/L-N (Nb) . 1 mg/L-N <br /> Denitrification in percent (d) 25 % <br />