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All tanks, regardless of material or method of construction, shall conform to the following design criteria. 1. The liquid depth of any septic tank or compartment thereof shall be not less tnau Lhirty (30) inches. A liquid depth greater than six and one -half (6 -1/2) feet shall not be considered in determining tank capacity. 2. No tank or compartment thereof shall have an inside horizontal dimension less than twenty -four (24) inches. 3. Inlet and outlet connections of the tank shall be submerged by means of baffles. 4. The volume in the tank between the liquid surface and the top of the inlet and outlet baffles shall be not less than twenty per cent (20%) of the total required liquid capacity, except that in horizontal cylindrical tanks, this space shall be not less than fifteen per cent (15%) of the total required liquid capacity. 5. Inlet and outlet baffles shall be constructed of acid resistant concrete, acid resistant fiberglass, or plastic. 6. Sanitary tees shall be bonded to the inlet or outlet pipe. Baffles shall be integrally cast with the tank, affixed with a permanent waterproof adhesive, or affixed with stainless steel connectors, top and bottom. 7. The inlet baffle shall extend at least six (6) inches, but not more than twenty per cent (20%) of the total liquid depth below the liquid surface and at least one (1) inch above the crown of the inlet sewer. 8. The outlet baffle and the baffles between compartments shall extend below the liquid surface a distance equal to forty per cent (40%) of the liquid depth, except that the penetration of the indicated baffles or sanitary tees for horizontal cylindrical tanks shall be thirty -five per cent (35%) of the total liquid depth. They also shall extend above the liquid surface as required in 4 above. In no case shall they extend less than six (6) inches above the liquid surface. 9. There shall be at least one (1) inch between the underside of the top of the tank and the highest point of the inlet and outlet devices. 10. The inlet invert shall be not less than three (3) inches above the outlet invert. 11. The inlet and outlet shall be located opposite each other along the axis of maximum dimension. The horizontal distance between the nearest points of the inlet and outlet devices shall be at least four (4) feet.