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%awe N..O� <br /> Septic tanks affect the sludge, scum and effluent volumes, which in turn affect treatment of <br /> nitrogen within the tanks. Typically, the volumetric capacity of septic tanks serving commercial <br /> facilities should be equal to approximately 5 times the average daily flow (ADF or QAVE)• In the <br /> following equations, the numerical value times the QAVE the peaking value (PF) correlate with <br /> the pump-out time interval in yrs. The peaking value is normally taken to be 1.5 for commercial <br /> projects: <br /> Pump-out Interval in yrs Recommended Septic Tank Volume in gals <br /> 2 2.4(675 gals) x 1.5 = 2,430 gals <br /> 3 2.8(675 gals) x 1.5 =2,835 gals <br /> 4 3.2(675 gals) x 1.5 = 3,240 gals <br /> 5 3.65(675 gals) x 1.5 = 3,696 gals <br /> 11 6 4.0(675gals) x 1.5 —4,050 gals <br /> SEPTIC TANK CAPACITY EXAMPLE: <br /> Recommended tank capacity for a pump out interval of four yrs: 3.2(QAVE) x Peaking Factor(PF) <br /> = 3.2(675 gals/day) x 1.5 = 3,240 gal tank capacity required: One - 2,000 gallon tank and one - <br /> 1,200 gallon tank together may be used. <br /> DETENTION TIME EXAMPLE: <br /> Detention Time = 3.200 gal tank capacity x 0.70 (30% volume lost to sludge/scum accumulation) <br /> 1.5 (Peaking factor) x 675 gals/day <br /> Detention Time =2.2 days. The minimum acceptable detention time is 0.5 day. <br /> LEACHFIELDSIFILTER BEDS <br /> It is our understanding the MicroSepTec®wastewater treatment system will use a single 1,200 <br /> gallon septic tank. Therefore, the Base Tank Capacity= 1,200 gal: <br /> Base Tank Capacity(BTC) +Average Daily Flow (ADF) x Soil Factor(SF) _ <br /> 1,200 gal BTC + 675 gal ADF x .250 SF=470 lineal feet of leachline <br /> Several scientific studies have demonstrated that the infiltration capacity of a soil absorption <br /> system is dependant primarily by the formation of the biomat and not by the permeability of the <br /> soil. The biomat is a biological, slimy substance which forms on the soil-effluent interface over <br /> time. Effluent hydraulic loading rates under equilibrium conditions range from a conservative <br /> criterion of 0.125 gal/ft'/day to 0.5 gal/ft'/day. <br /> 9 <br /> Chesney Consulting <br />