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r--+ <br /> Septic Sys - Permanent Residence <br /> r <br /> Data Input: <br /> Effluent Quantity in GPD (Q): Q200 Gal/Day <br /> Effluent Stream in mg/L-N (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 /> Nc = Wi*Nw(1-d)+RNfi i <br /> Wi+R <br /> } Result: <br /> Uniform waste water loading (Wi) 0. <br /> Mass Balance in mg/L-N (Nj: 2.31 mg/L- <br /> Total Nitrate Mass <br /> =' MCL Drinking Water N as N: 10 m IL-N <br /> rr Perecnt of MCL Nitrate as N 23 % <br /> -- Variables: <br /> �- Nc=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 /> F R = Uniform deep percolation of rainfall (inches/yr) <br /> Nb = Background nitrate-N concentration of rainfall (mg/L-N) <br /> Assumptions: <br /> Effluent Stream in mg/L-N (Nx,): 44 mg/L-N <br /> Concentratiion in Rain in mg/L-N (Nb) : _N <br /> Denitrification in percent (d): 25 % <br /> F <br /> F <br /> r <br /> i <br /> F <br /> i <br /> i <br /> F�l <br />