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I <br /> I <br /> I <br /> I <br />I <br /> I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />§ 8.30 <br /> <br /> 15. Compa~mentation. Septic tanks larger than 3,000 gallons <br /> and fabricated as a single unit shall be divided into two or <br /> more compartments. <br /> (a) V~nen a septic t~nk is divided into two compartments, <br /> 2 <br /> not less than ~, nor more than § of the total volume, shall <br /> be in the first compartment. <br /> (b) V~nen a septic tank is divided into three or more <br /> compartments, ~ of the total vol.me shall be in the first <br /> <br /> compartment and the other ~ equally divided in the other <br /> compartments. <br /> <br /> 16. Connections between compartments shall be baffles so as to <br /> obtain effective retention of scum and sludge. The <br /> submergence of the inlet and outlet baffles of each <br /> compartment shall be as specified in paragraphs 7 and 8 <br /> above. <br /> <br /> 17. Adequat'~ venting shall be provided between compartments <br /> by baffles or by an opening of at least 50 square inches near <br /> the top of the compar~.ment <br /> <br /> 18. Adequate access to each compartment shall be provided by <br /> one or more m~holes, at least 20 inches in dimension, and <br /> located within 6 feet of any wall of the tank. The manhole <br /> shall extend to a point v~ith~n 12 inches, but not closer than 6 <br /> inches, below finished grade. The manhole cover shall be <br /> covered with at least 6 inches of earth. <br /> <br />19. Vfhere more than one t~nk is used to obtain the required <br /> liquid volt, me, the t~nks shall be connected in series. <br /> a) Each tank shall comply with all other provisions of <br /> §8.30.04 SubcL 3. <br /> b) No more than four tanks in series can be used to obtain <br /> the required liquid volt, me. <br /> c) The first tank shall be no smaller than any subsequent <br /> tanks in series. <br /> <br />20. Aerobic tanks. Aerobic tank treatment systems shall comply <br /> with the genera/ requirements for sewage tanks set forth in <br /> Subd. 2, and with the following: <br /> a) The treatment system including each individual unit or <br /> compartment shall be easily accessible for inspection <br /> and maintenance and shall be provided with secured <br /> COVerS. <br /> <br /> b) The raw sewage flow from the dwelling shall be <br /> intercepted by a trash trap prior to its entering the <br /> <br />Printed 12/28/90 <br /> <br />Page 243 <br /> <br /> <br />