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d.Tank Removal and Disposal (continued) Once the excavation process begins the lei/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 rinsate disposed of under manifest according to current guidelines. AO 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 guidance of the environmental health department. Once the samples are taken the excavation will be secured awaiting laboratory results. e.. Confined Space Entry A confined space entry must be approved by Aronson Engineering Company Safety Officer. Contaminated soil excavations may pose additional hazards such as air contamination,flammable or explosive atmosphere, and oxygen deficiency. Entry into trenches and excavations meets the definition of a confined space.Ali confined space entries shall be in accordance with the following procedures. No site workers will enter the tank,or an excavation over 5 feet in depth. Should it become necessary to enter tank a confined space entry permit will be obtained from Aronson Engineering Company Safety Officer prior to thej entry of worker into a confined space,and the standard operating procedure(SOP)for confined space entry shall be followed. - Ensure that all pipes entering into the confined space have been disconnected and sealed. - Remove any liquids or sludges from the confined space. - Ventilate the confined space with fresh air. The ventilation mechanism should be explosion proof. - Test the atmosphere of the confined space with a oxygen/combustible meter. The oxygen content of the space must be between 19.5 and 22.0% and the LEL indication below 10% before personnel can enter the confined space. - Monitor the concentration of Benzene, Toluene, Xylene, and Ethel Benzene in the space. If the concentration of Benzene exceeds.005 ppm, or any other the other vapors exceed 100 ppm, do not enter the space. - Personnel entry into any excavation five feet deep or greater is only permitted if the walls are properly shored or sloped. A ladder shall be provided and placed at an angle not more than 30 degrees from vertical, and secured as necessary. Ladder side rails shall extend at least three feet above the ground surface. Install extraction devices over the confined space. Provide a stand-by person for the confined space entry. Hold a pre-entry meeting to discuss the work task, on-site communications, and emergency procedures. Monitoring of the confined space shall be on-going throughout the entry. D-5