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• • <br /> OPERATING PROCEDURE NO. HS-513 <br /> REMOVAL OF UNDERGROUND STORAGE TANKS <br /> 513.1 PURPOSE <br /> Operating Procedure No. HS-513 has been developed to provide guidance for the safe <br /> and efficient removal of underground storage tanks (USTs). Although site conditions may <br /> vary from project to project, this procedure provides general guidelines that can be <br /> followed on a variety of UST removal projects. This procedure must be used as an <br /> attachment to site specific work plans and health and safety plans that detail unique site <br /> conditions and requirements, as well as potential physical and chemical hazards at each <br /> site. <br /> 513.2 APPLICABILITY <br /> This procedure applies to all projects that involve the excavation, purging, cleansing, <br /> removal, and disposal of USTs. Portions of Operating Procedure No. 512, Excavation <br /> and Trenching, may also apply to these projects. <br /> 513.3 TANK CONTENTS SAMPLING <br /> • USTs are used to store a variety of materials such as gasoline, diesel, aviation gas, jet <br /> fuel, solvents, mineral spirits, and waste oil. Accurate records concerning the contents of <br /> USTs may or may not be available. Older tanks that have been abandoned for many <br /> years with no security to prevent dumping are often not documented or may contain <br /> unknown materials. <br /> Sampling and analysis of the tank contents must be performed to determine the hazards <br /> associated with the materials, and to evaluate options for disposal. When possible, <br /> sampling and analysis of the tank contents will be performed prior to the initiation of field <br /> work to allow inclusion of site specific hazard evaluations and requirements into the site <br /> health and safety plan. Samples will be collected from tank outlets, if possible, or <br /> siphoned from inlet ports. <br /> 513.4 EXPOSING, PURGING, AND DISPOSAL OF TANK CONTENTS <br /> 513.4.1 Exposing the Tank <br /> All known openings in the tank will be expose utilizing both power tools and hand tools. <br /> The tank will be exposed until sufficient area is available for purging and inerting the <br /> tank. In order to minimize the risk of explosions, power tools will not be allowed to come <br /> into contact with the tanks. Non-sparking hand tools will be used to finish exposing the <br /> • tanks. <br /> 1 <br />