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Septic Sys 1 - Permanent Residence <br /> -� Data Input: <br /> r- Effluent Quantity in GPD (Q): 200 Gal/Day <br /> ' Effluent Stream in mg/L-N (Nj 44 mg/L-N <br /> Site Area in Acres (A): 22 Acres <br /> Concentratiion in Rain in mg/L-N (Nb) 1 mg/L-N <br /> Denitrification in percent(d): 25 % <br /> Deep Perc. Of Rain in inches/yr (R }: 2.86 In/yr <br /> Calculations: <br /> Wi=Q x Cu-Ft/Gal x (Days/Yr) x (Sq-Ft/Acre x Inches/Ft) x (1/A) <br /> N°= Wi"N-(1-d)+RNA, <br /> i 1A <br /> Wi+R <br /> s Result: <br /> Uniform waste water load Wi) 0.12 InchesNr <br /> Mass Balance in mg/L- (N°): 2.31mg/L- <br /> Total Nitrate Mass 20 Ibs <br /> MCL Drinking Water N as N: 10 m /L-N <br /> Perecnt of MCL Nitrate as N 23 % <br /> a <br /> Variables: <br /> 1 N° =Average nitrate-N concentration (mg/L) 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 (mglL-N) <br /> Assumptions: <br /> Effluent Stream in mg/L-N (N,,): =44mg/L-N <br /> Concentratiion in Rain in mg/L-N (Nb) 1 mg/L-N <br /> F; Denitrification in percent(d): 25 % <br /> u � <br /> F. <br /> 6 . <br /> t2 <br />