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i <br /> Proposed Septic Sys - New Chapel <br /> Data Input: <br /> Effluent Quantity in GPD (Q): 300 Gai/Day <br /> F Effluent Stream in mg/L-N (N,): 80 mg/L-N <br /> Site Area in Acres (A): 22 Acres <br /> 7 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 /> j 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-0-d)+RW <br /> Wi+R <br /> Result: <br /> Uniform waste waterjo (Wi) es/Yr—� o tG✓ <br /> Mass Balance in mg/L-N ( �): 4.55 mg/L-N <br /> oa arae a 5 s <br /> MCL Drinking Water N as N: 10 m /L-N <br /> Perecnt of MCL Nitrate as N F- 46 % <br /> Variables:3) <br /> 3)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 /> F` Assumptions: <br /> Effluent Stream in mg/L-N (Nw): 80 m IL-N <br /> 9 <br /> Concentratiion in Rain in mg/L-N (Nb) <br /> F Denitrification in percent (d): 25 % <br /> �i <br /> L ! <br /> I <br /> F <br />