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E. The Contractor shall <br />relevant procedures <br />Municipal mandates. <br />be familiar and comply with the <br />established by all Federal, State and <br />F. Owner or its agent will remove the free product from the <br />tank, leaving the bottom sediment and water for removal, <br />by the Contractor. Bottom sediment and water shall be <br />disposed of in a safe manner that is acceptable to the <br />Local, State and Federal regulatory agencies. <br />G. Before any work is done, the work area is to be <br />barricaded and the required Danger and Caution signs <br />posted. The area is to be kept free of sources of <br />ignition during the work period. <br />H. The Contractor will have on hand, a properly maintained <br />and tested portable fire extinguisher, with a minimum <br />Underwriter Laboratory extinguisher rating of 12 B. <br />I. PURGING THE TANK OF FLAMMABLE VAPORS <br />A. The tank is to be isolated from any flammable vapor <br />source before work begins. Tanks that are <br />manifolded together create a prevalent danger in <br />that explosive vapors can infiltrate a tank after it <br />has been purged. Submersible pumps must be removed <br />and openings plugged. Lines that may be common to <br />other storage tanks, such as suction, syphon and <br />vent lines, are to be blanked. The Contractor must <br />be aware that it is common practice to manifold vent <br />lines at locations where the tanks have been adapted <br />for vapor recovery. <br />B. The tank shall be purged of flammable vapors by use <br />of an air mover constructed of light gauge metal of <br />the venturi (jet) type, or low pressure blower. <br />Air movers located in the possible path of vapor <br />travel shall be driven by steam, air or explosion <br />proof electric motors. The apparatus used to inject <br />the air is to be bonded to the tank. <br />C. Purging is to continue as long as tests show vapors <br />in the flammable range are contained in the tank. <br />D. Tests for flammable vapors are to be made with a <br />Combustible Gas Indicator, immediately before <br />cutting or drilling and frequently during the course <br />of the work. Vapor samples are to be taken in the <br />excavation and at the top, middle and bottom of the <br />tank at each testing. It is essential that the <br />operator using the indicator be well schooled in the <br />Page 3 <br />