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r ' <br /> �v <br /> 7. <br /> r <br /> UJI <br /> Proposed Septic Sys - New-Large System <br /> L <br /> Data Input: <br /> Effluent Quantity in GPD (Q): 4,835 Gal/Day <br /> Effluent Stream in mg/L-N (N„,): 5 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 /> F" 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 /> FDNcWi*NX-d)+RK, <br /> Wi+R <br /> Fi <br /> Result: <br /> Uniform wast�wa (Wi) 2.95 cher/Yrss alanc /L-N (N,,): 22.52 mglL- <br /> Total Nitrate Mass 6 lbs <br /> MCL Drinking Water N as N: 10 m /L-N <br /> Perecnt of MCL Nitrate as N L 225 % <br /> Variables: <br /> 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 (mg/L-N) <br /> FJ Assumptions: <br /> Effluent Stream in N m /L-N <br /> g (N,,): 57.8 mglL-N <br /> Concentratiion in Rain in mg/L-N (Nb) : mg/L-N <br /> F Denitrification in percent (d): 25 % <br /> F <br /> F: <br /> i <br /> Fi <br />