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-7- <br /> <br />All tanks, regardless of material or method of construction, shall conform to <br />the following design criteria. <br /> <br /> 1. The liquid depth of any septic tank or compartment thereof shall be <br />not less than thirty (30) inches. A liquid depth greater than six and one-half <br />(6-1/2) feet shall not be considered in determining tanl~ capacity. <br /> <br /> 2. No tank or compartment thereof shall have an inside horizontal <br />dimension less than twenty-four (24) inches. <br /> <br /> 3. Inlet and outlet connections of the tank shall be submerged by <br />means of baffles. <br /> <br /> 4. The volume in the tank between the liquid surface and the top of <br />the inlet and outlet baffles shall be not less than twenty per cent (2070) of the <br />total required liquid capacity, except that in horizontal cylindrical tanks, <br />this space shall be not less than fifteen per cent (15%) of the total required <br />liquid capacity. <br /> <br /> 5. Inlet and outlet baffles shall be constructed of acid resistant <br />concrete, acid resistant fiberglass, or plastic. <br /> <br /> 6. Sanitary tees shall be bonded to the inlet or outlet pipe. Baffles <br />shall be integrally cast with the tank, affixed with a permmnent waterproof <br />adhesive, or affixed with stainless steel connectors, top and bottom. <br /> <br /> 7. The inlet baffle shall extend at least six (6) inches, but not more <br />than twenty per cent (20%) of the total liquid depth below the liquid surface <br />and at least one (1) inch above the crown of the inlet sewer. <br /> <br /> 8. The outlet baffle and the baffles between compartments shall extend <br />below the liquid surface a distance equal to forty per cent (40%) of the liquid <br />depth, except that the penetration of the indicated baffles or sanitary tees for <br />horizontal cylindrical tanks shall be thirty-five per cent (35%) of the total <br />liquid depth. They also shall extend above the liquid surface as required in 4 <br />above. In no case shall they extend less than six (6) inches above the liquid <br />surface. <br /> <br /> 9. There shall be at least one (1) inch between the underside of the <br />top of the tank and the highest point of the inlet and outlet devices. <br /> <br /> 10. The inlet invert shall be not'less than three (3) inches above the <br />outlet invert. <br /> <br /> 11. The inlet and outlet shall be located opposite each other along <br />the axis of maximum dimension. The horizontal distance between the nearest <br />points of the inlet and outlet devices shall be at least four (4) feet. <br /> <br /> 12. Sanitary tees shall be at least four (4) inches in diameter. <br />Inlet baffles shall be no less than six (6) inches or no more than twelve (12) <br />inches measured from the end of the inlet pipe to the nearest point on the <br />baffle. Outlet baffles shall be six (6) inches, measured from the beginning of <br />the oulet pipe to the nearest point on the baffle. <br /> <br /> <br />