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D. Metal Tanks <br />Metal tanks shall have a wall thickness of at least eight gauge <br />corrosion resistant alloys and shall be coated inside and out <br />with at least one coat of bitumastic seal, Koppers 300-M, or by <br />other equivalent means. Tanks shall be carefully installed so as <br />not to puncture or damage the seal Coating. <br />E. Block or Sectional Tanks <br />(1) Rectangular Blocks <br />(a) Rectangular blocks shall be laid on an approved bottom. <br />}'. Block shall be at least eight inches thick, constructed <br />,� of a 4,000 psi core test concrete mix, and cured to a <br />' 28-day strength before installation. <br />r= (b) Rectangular blocks shall be laid either with mortar <br />joints or filled cores. <br />4 <br />(c) There shall be at least two coats of 1/4 inch thick <br />concrete plaster placed on the inside of the block tank. <br />There shall be at least two hours elapsed time between <br />coats. The plaster coat shall start at the bottom course <br />and work up. <br />(2) Circular Block Tanks <br />(a) Circular blocks shall be carefully placed on an approved <br />bottom. Circular blocks shall be at least two inches <br />thick and constructed of a 4,000 psi core test concrete <br />mix, cured to a 28-day strength before installation. <br />• (b) There shall be at least two coats of 1/4 inch thick <br />concrete plaster placed on the insida of the block tank. <br />There shall he at least two hours elapsed time between <br />coats. The plaster coat shall start at the bottom course <br />and work up. <br />(3) Sectional Tanks <br />(a) 11. sectional tank shall have an entire section cast as an <br />integral unit. <br />(b) A sectional tank shall have two or more Lections and shall <br />have at least one joint below the level of the outlet in- <br />vert of the tank. <br />C: <br />(c) Sectional tanks shall have an integrally cast bottcm, or <br />shall be laid on an approved bottom. <br />-2- <br />