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tank is not more than 100/c of the lower explosive <br /> limit (L.E.L.) of the product previously in the <br /> tank. Atmosphere inside the tank shall be checked <br /> at the top and the bottom. An oxygen measuring <br /> device may also be used to ensure that the tank <br /> has been inerted. An oxygen reading of below <br /> 13% will be required prior to removal. <br /> It is necessary that the vapors be purged prior <br /> to arrival of the fire inspector. Each tank <br /> will be allotted a maximum of 1 hour for <br /> removal and loadings for transport. <br /> Openings are to be closed using a pressure- <br /> vacuum relief device or other NFPA approved <br /> device. <br /> Tanks are to be lifted using proper equipment. <br /> It will be the fire inspector's responsibility <br /> to stop any operation the inspector believes <br /> to be unsafe. Tanks shall not be dragged at <br /> any time. Only nonsparking tools may be used <br /> to clean exterior of tank. <br /> Immediately transport tanks from site to an <br /> approved location. <br /> Underground waste oil tanks may be opened on <br /> site to be triple rinsed provided the vapor <br /> concentration is below 10% of the L.E.L. All <br /> liquid is to be disposed of under manifest as <br /> hazardous waste. <br /> ' It shall be the contractor's responsibility to <br />