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(d) The joint or joints shall be permanently se, .ed so as to <br />be watertight. <br />(4) Bottoms <br />(a) Any tank not having an integrally cast bottom shall not be <br />installed when the water table is closer than three inches <br />to the bottom of the excavation. <br />(b) If the bottom is poured -in -place concrete, it shall be <br />at least four inches thick and extend to at least four <br />inches outside the tank wall. A concrete mix of at <br />least one part cement, two parts washed sand and three <br />parts washed rock shall be mixed before placement in <br />the excavation. <br />(c) If a starter ring is used, it shall be constructed of a <br />4,000 ps- core test concrete mix, cured to a seven-day <br />strength before installation. It shall extend is least <br />one inch beyond the tank wall, inside and out. A bottom <br />shall be poured of concrete mix defined in Section (b) <br />above. It shall extend at least two inches above the <br />starter ring and shall be at least four inches thick. <br />(d) If a precast bottom is used, it shall be made of a 4,000 <br />psi core test concrete mix, cured to a seven-day strength <br />before installation. It shall extend at least one inch <br />beyond the tank wall, or be cast integrally with the <br />bottom section. <br />(e) sectional tank not having an integrally precast bottom <br />shall have a four -inch thick bottom poured within the <br />tank walls. <br />(5) Covers <br />(a) Any tank cover not integrally cast with the tank shall be <br />so installed that the joint with the tank sidewall is <br />permanently sealed so as to be watertight. <br />(b) All covers shall be so designed and --onstructed as to <br />withstand a minimum of seven feet of saturated earth cover <br />above the tank top. <br />F. Inlet and Outlet•Device Materials <br />(1) Inlet and outlet devices shall be sanitary tees, or baffles <br />constructed of acid resistant concrete, acid resistant <br />fiberglass or plastic. <br />(2) Sanitary tees shall be glued to the inlet or outlet pipes. <br />Baffles shall be integrally cast with the tank, affixed with <br />a permanent waterproof adhesive or affixed with stainless <br />steel connectors, top and bottom. <br />- 3 - <br />