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6. Cap openings on all tanks before removing tanks from site. <br /> a) Nitrogen - tank must be capped to maintain nitrogen <br /> blanket. <br /> b) Carbon dioxide gas - tank must be capped to maintain gap <br /> blanket. <br /> c) The use of dry ice requires a vent,,hole ,for pressur <br /> relief. <br /> 1) Vent cap will have 1/8 inch opening on top: <br /> 7. Empty underground tanks , if not properly cleaned, are <br /> considered hazardous waste. Requirements for handling: <br /> a) Must be hauled to a certified hazardous waste site. <br /> b) Truck must be certified to haul hazardous waste. <br /> C) Must be able to present a hazardous waste manifest"before <br /> leaving the site. <br /> 8 . Equipment to hoist tank must be rated for the calculated <br /> load: <br /> a) Equipment must not be strained. <br /> b) Tanks are not to be dragged. <br /> Note: Job will be halted if these criteria are not 'met. <br /> c) Load tank on carrier with pressure relief hole directed <br /> upward and all caps in place. <br /> Definition• <br /> O - Oxygen concentration in air <br /> LEL - Lower explosive limit in air. <br /> UEL - Upper explosive limit in air. <br /> Product ' ft1 LEL (6) OF <br /> Gasoline 1. 3 8 ,2 <br /> Diesel 0, 6 7.5 <br /> Waste Oil 9 . 0 N/A <br /> Methanol 6. 0 36. 5 <br /> Comp. 'Nat. Gas 3 . 8 17. 0 <br /> Propane (LPG) 2 . 4 9 . 5 <br /> Liquid Asphalt 9. 0 N/A <br /> PAGE NINETEEN <br />