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-2- <br /> 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 gas <br /> blanket. <br /> c) The use of dry ice requires a vent hole for pressure <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 /> lead: <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 /> D,­7 -;'-n i t ion : <br /> lace_a,­=�nition : <br /> O = Oxygen concentration in air <br /> LEL � Lower explosive limit in air . <br /> UEL = Upper explosive limit in air . <br /> product ( °;) LEL UEL <br /> Gasoline 1 . 2 8 . 2 <br /> Diesel 0 . 6 7 . 5 <br /> Wast _ Oil 9 . 0 N/A <br /> Methanol 6 . 0 36 . 5 <br /> Comp . Nat . Gas 3 . 3 17 . 0 <br /> Propane (LPG) 2 . '+ 9 . 5 <br /> Liquid Asphalt 9 . 0 N/A <br />