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0 d. Tank Removal and Disposal Before any digging can begin, must be located and identified. all underground utilities The minimum protective clothing, to be worn by personnel within the exclusion zone during the tank removal operation, is Level D clothing. Higher levels of protective clothing may be required if some unforeseen conditions should arise; the next level of PPE will be available in the support zone to upgrade should conditions warrant. Once the excavation process begins the lel/oxygen meter will be monitored every hour. The oxygen level must remain between 19.5 and 22.0%. The LEL level must not exceed 100 ppm. If the level exceeds 100 ppm level C PPE must be donned. Level C PPE consists of Level D PPE with the addition of half face respirators with organic cartridges, and Tyvex suits. Once the tank is uncovered the piping will be disconnected. The tank will be triple rinsed and the rinseate disposed of under manifest according to current guidelines. All openings in the tank top will be plugged. One plug to have a 1/8" opening to allow for vapor displacement. A minimum of one (1) hour prior to tank removal Dry Ice will be introduced at the rate of 20 pounds per thousand, to render the tank inert. The tank will be checked with an LEL/Oxygen meter prior to removal and if the LEL and Oxygen levels are below those required by the on-site representatives of the Environmental Health Department and the Local Fire Department representatives the tank can then be removed with the appropriate lifting equipment. The tank will be loaded onto a truck provided for by the environmental company for disposal. Aronson Engineering will assist the environmental company in the taking of soil or water samples under the guideance of the environmental health department. Once the samples are taken the excavation will be secured awaiting laboratory results. D-5