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ignition source be located within 50 feet of <br /> the tank to be inerted. <br /> Underground tanks that previously contained Class <br /> I or II flammable liquid shall be inerted prior <br /> to excavation. <br /> The top of the tank shall be exposed to provide <br /> access to all of the tank openings. <br /> Any piping containing product shall be carefully <br /> disconnected and the contents shall be disposed of <br /> in an approved manner. All piping associated with <br /> the underground tank shall be removed and disposed <br /> of. <br /> Remove all possible products from the tank by <br /> means of an approved pump with suction resting <br /> on the bottom of the tank. All products shall be <br /> properly disposed of. <br /> All remaining piping and drop tube may be <br /> disconnected/removed from the tank. <br /> Two openings at opposite ends of the tank shall <br /> be used for the inerting procedure; all other <br /> openings shall be sealed. <br /> A flammable vapor detection device that has been <br /> calibrated within the past 6 months shall be on <br /> the job site prior to excavation or removal. <br /> Tanks shall be purged of flammable vapor in <br /> accordance with NFPA guidelines. It shall <br /> be the North Cal Construction's responsibility <br /> to demonstrate to the fire inspector, upon <br /> arrival, that the vapor concentration inside t►e <br />