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L J <br /> Proposed Septic Sys 2 - New Chapel <br /> Fi <br /> Data input: <br /> Effluent Quantity in GPD (Q): 150 Gal/Day <br /> 4.� Effluent Stream in mg/L-N (N„,): 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 /> r Deep Perc. Of Rain in inches/yr (R }: 2.86 In/yr <br /> ` Calculations: <br /> t!+ <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)+RNh <br /> Wi+R. <br /> Result: <br /> Uniform waste water loading (Wi) 0.09 1 s/Yr ` <br /> Mass Balance in mg/L-N (Nr): 1.99 m - <br /> Total Nitrate Mass 15 lbs <br /> MCL Drinking Water N as N: 10 m IL-N <br /> Perecnt of MCL Nitrate as N 20 <br /> F <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 /> j 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 /> E <br /> ' Nb = Background nitrate-N concentration of rainfall (mg/L-N) <br /> Assumptions: <br /> Effluent Stream in mg/L-N (N,): 44 mg/L-N r/ <br /> Concentratiion in Rain in mg/L-N (Nb) <br /> ri; <br /> Denitrification in percent (d): 25 % <br /> i <br /> �f I <br />