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c. If a starter ring is used, it shall be constructed of a 4,000 psi core <br />test concrete mix, cured to a seven-day strength before installation. <br />It shall extend at least one inch beyond the tank wall, inside and out. <br />A bottom shall be poured of concrete mix defined in Section (b) above. <br />It shall extend at least two inches above the starter ring and shall be <br />at least four inches thick. <br />d. If a precast bottom is used, it shall be made of a 4,000 psi core test <br />concrete mix, cured to a seven-day strength before installation. It <br />shall extent at least one inch beyond the tank wall, or be cast <br />integrally with the bottom section. <br />e. A sectional tank not having an integrally precast bottom shall have a <br />four -inch thick bottom poured within the tank wall. <br />5. Covers <br />a. Any tank cover not integrally cast with the tank shall be so installed <br />that the joint witn the tank sidewall is permanently sealed so as to be <br />watertight. <br />b. All covers shall be so designed and constructed as to withstand a <br />minimum of seven feet of saturated earth cover above the tank top. <br />F. Inlet and Outlet Device Materials <br />1. Inlet and outlet devices shall be sanitary tett), or baffles constructed of <br />acid resistant concrete, acid resistant fiberglass or plastic. <br />2. Sanitary tees shall be glued to the inlet or outlet pipes. Baffles shall be <br />integrally cast with :he tank, affixed with a permanent waterproof adhesive <br />or affixed w?th stainless steel connectors, top and bottom. <br />2. DESIGN <br />All tanks, regardless of material or method of construction, shall conform to <br />the followinq design criteria: <br />A. The 11QUI) DEPTH Of any septic tank or compartment thereof shall be not less <br />than 3U inches. A liquid depth greater than six and one-half feet shall not <br />be considered in determining tank capacity. <br />B. No tank or compartment thereof shall have an inside horizontal dimension less <br />than 24 inches. <br />C. Inlet and outlet connections of the tank thereof shall be submerged by <br />means of vented, sanitary tees of baffled. <br />0. The space in the tank between the liquid surface and the top of the inlet <br />and outlet baffles or sanitary tees shall oe not less than 20 percent of the <br />total required liquid capacity, except that in horizontal cylindrical tanks <br />this space shall be not less than 15 perctart of the total required liquid <br />capacity. <br />