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SEC31®N 9i. ®ESBGB~ CRBTERIA ~Standlara1 Treatrnent BJnits) <br />S.DS Design and Construction of Septic Tanks <br />A. Size: Aseptic tank shall be constructed to permit detention of incoming sewage for <br />a minimum of thirty (30) hours, based on maximum daily flow, except that septic <br />tanks serving residential units shalt be of a capacity based upon the number of <br />bedrooms according to the following table: <br />Minimum Effective Liquid <br />Number ofBedrooms Tank rapacity atlonsl <br />2 1000 <br />3 1000 <br />4 1250 <br />Each Additional 250 <br />B. tic tank design criteria: <br />1. Septic tanks must be accessible for pumping. <br />2. Except for grey water systems the effective liquid capacity shall be no less <br />than 1,000 gallons. <br />3. Inlet invert shall be at least three (3) inches higher than the outlet invert. <br />4. Outlet tee or ba$]e shall extend above the surface of the liquid to within one <br />(t) inch ofthe underside ofthe tank top and shall extend at least fourteen (14) <br />inches below the outlet invert. <br />A screen Slter capable of retaining solid waste must be installed at the outlet <br />of all septic tanks. The filter must be easily accessible for periodic cleaning. <br />5. The distance finm the outlet invert to the underside of the tank top shall be at <br />least ten (10) inches. <br />6. Liquid depth shall be a rrrinimum of thirty (30) inches and the maximum depth <br />shall not exceed the tank length or sixty (60} inches, whichever is less. <br />A septic tank shall have two or more compartments or more than one tank <br />may be used in series to provide the following capacity arrangement. The first <br />compartment of a septic tank shall hold no less than %z of the required <br />36 <br />