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(4) No tank or compartment thereof shall have <br /> an inside horizontal dimension less than <br /> twenty four (24) inches . <br /> (5) Inlet and outlet connections of the tank and <br /> of each compartment thereof shall be sub- <br /> merged by means of vented tees or baffles <br /> so as to obtain effective retention of scum <br /> and sludge. <br /> (6) The space in the tank between the liquid <br /> surface and the top of the inlet and outlet <br /> baffles or submerged pipes shall be not less <br /> than twenty (20) percent of the total <br /> required liquid capacity, except that in <br /> horizontal cylindrical tanks this space <br /> shall be not less than fifteen (15) percent <br /> of the total required liquid capacity. <br /> (7) The inlet baffle or submerged pipe shall <br /> extend at least six (6) inches but not <br /> more than twenty (20) percent of the total <br /> liquid depth, to the nearest inch, below <br /> the liquid surface and at least one inch <br /> above the crown of the inlet sewer. <br /> (8) The outlet baffle or submerged pipe and <br /> the baffles or submerged pipes between <br /> compartments shall extend below the liquid <br /> surface a distance equal to forty (40) <br /> percent, to the nearest inch, of the liquid <br /> depth except that the penetration of the <br /> indicated baffles or submerged pipes for <br /> horizontal cylindrical tanks shall be <br /> thirty five (35) percent, to the nearest <br /> inch, of the total liquid depth. They <br /> also shall extend above the liquid surface <br /> to provide for scum storage as required in <br /> item #6 above. In no case shall they <br /> extend less than six (6) inches above the <br /> liquid surface. <br /> (9) There shall be at least one inch between the <br /> underside of the top of the tank and the <br /> highest point of the inlet and outlet devices <br /> and partitions so as to provide the required <br /> ventilation of the system through the main <br /> building stack. <br /> -7- <br />