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F <br /> 7 <br /> Septic Sys 2 - Mobile Residence <br /> Data Input: <br /> Effluent Quantity in GPD (Q): 210 Gal/Day <br /> Effluent Stream in mg/L-N (N,): 44 mg/L-N <br /> Site Area in Acres (A): 1.27 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 /> NG= 1 i*N 1-d)+RN <br /> Wi+R <br /> Result: <br /> Uniform waste water loading (Wi) 2.22 Inchs <br /> Mass Balance in mg/L-N (N,): mg - <br /> Total Nitrate Mass s <br /> -' MCI_ Drinking Water N as N: 10 m /L-N <br /> Perecnt of MCL Nitrate as N 150 % <br /> ' Variables: <br /> T7 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 /> Nb = Background nitrate-N concentration of rainfall (mg/L-N) <br /> Assumptions: <br /> ► Effluent Stream in mg/L-N (NW): 44 mg/L-N <br /> Concentratiion in Rain in mg/L-N (Nb) 1 mg/L-N <br /> Denitrification in percent (d): 25 <br /> I i <br /> .r, I <br /> i <br /> I <br /> _. I <br />