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<br />.-.~.. <br /> <br />by the latter cannot be transmitted to the tatik. The <br /> <br /> <br />distance from any part of a tank storing Class II or <br /> <br /> <br />III liquid to the nearest ,vall of any basement, pit, <br /> <br /> <br />cellar, or property line shall be not less than one <br /> <br /> <br />foot. The dist.ance from any part of a tank storing <br /> <br /> <br />Class I liquids to the nearest wall of any basement, <br /> <br /> <br />pit or cellar shall be not less than one foot, and <br /> <br /> <br />from any property line tIlat may be built upon, not <br /> <br /> <br />less than three feet. A minimum distance of three <br /> <br /> <br />feet, shell to shell, shall be maintained between <br /> <br /> <br />underground tanks. <br /> <br /> <br />II 'b. Depth and Cover. Excavation for underground <br /> <br /> <br />storage tanks shall be made with due care to avoid <br /> <br /> <br />undeDmining of foundations of existing structures. <br /> <br /> <br />Underground tanks shall be set on a f inn foundation, <br /> <br /> <br />the perimeter of which foundation shall be surrounded <br /> <br /> <br />with a minimum of six inches of clean sand. The tank <br /> <br /> <br />shall be surrounded wit.h a minimum of 12 inches of <br /> <br /> <br />clean sand or equal material well-tamped in place. <br /> <br /> <br />II 'Tanks- shall be covered with a minimum of two <br /> <br /> <br />feet of sand or shall be covered by not less than <br /> <br /> <br />one foot of sand on top of which shall be placed a <br /> <br /> <br />slab of reinforced concrete not less than four inches <br /> <br /> <br />thick. When underground tanks are or are likely to <br /> <br /> <br />be subjected to traffic, they shall be protected <br /> <br /> <br />against damage from vehicles passing over them by <br /> <br /> <br />,at least three feet of sand or, in the alternative, <br /> <br /> <br />18 inches of "Jell-tamped' sand plus six inches of <br /> <br /> <br />reinforccd concrete or ei~ht inches of asphaltic <br /> <br /> <br />concrete. When asphaltic or reinforced concrcte <br /> <br />-14- <br />