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-8- <br /> <br /> 13. There shall be one (1) or more manholes, at least twenty (20) <br />inches in dimension, and located within six (6) feet of any wall of the tank. <br />The manhole shall extend to a point within twelve (12) inches of, but no closer <br />than six (6) inches below, finished grade. The manhole cover shall be covered <br />with at least six (6) inches of earth. <br /> <br /> 14. There shall be an inspection pipe of at least four (4) inches <br />diameter or a manhold over both the inlet and outlet devices. The inspection <br />pipe shall extend through the cover and be flush with, or no more than six (6) <br />inches below, the finished grade. The top of the inspection pipe shall be <br />provided with a readily removable water-tight cap. A downward projection of the <br />centerline of the inspection pipe shall be directly in line with the center line <br />of the inlet or outlet device. <br /> <br /> 15. Compartmentation. Septic tanks larger than three thousand (3,000) <br />gallons and fabricated as a single unit shall be divided into two (2) or more <br />compartments. <br /> <br />b <br /> <br />When a septic tank is divided into two (2) compartments, not <br />less than one-half (1/2), nor more than two-thirds (2/3) of <br />the total volume, shall be in the first compartment <br />When a septic tank is divided into three (3) or more <br />compartments, one-half (1/2) of the total volume shall be in <br />the first compartment and the other one-half (1/2) equally <br />divided in the other compartments. <br /> <br /> 16. Connections between compartments shall be baffles so as to obtain <br />effective retention of scum and sludge. The submergence of the inlet and outlet <br />baffles of each compartment shall be as specified in paragraphs 7 and 8 above. <br /> <br /> 17. Adequate venting shall be provided between compartments by baffles <br />or by an opening of at least fifty (50) square inches near the top of the <br />compartment wall. <br /> <br /> 18. Adequate access to each compartment shall be provided by one (1) <br />or more manholes, at least twenty (20) inches in dimension, and located within <br />six (6) feet of any wall of the tank. The manhole shall extend to a point <br />within twelve (12) inches, but not closer than six (6) inches, below finished <br />grade. The manhole cover shall be covered with at least six (6) inches of <br />earth. <br /> <br /> 19. Where more than one (1) tank is used to obtain the required liquid <br />volume, the tanks shal be connected in series. <br /> <br />Each tank shall comply with all other provisions of Chapter <br />150.01.4C. <br />No more than four (4) tanks in series can be used to obtain <br />the required liquid volume. <br />The first tank shall be no smaller than any subsequent tanks <br />in series. <br /> <br /> <br />