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d. Confined Space Entry NOT REQUIRED FOR THIS PROJECT <br /> A confined space entry must be approved by Tait Environmental Systems Company Safety Officer. <br /> Contaminated sail excavations may pose additional hazards such as air contamination, flammable or explosive <br /> atmosphere, and oxygen deficiency. Entry into trenches and excavations meets the definition of a confined space. <br /> All confined space entries shall be in accordance with the following procedures. <br /> No site workers will enter the tank, or an excavation over 5 feet in depth. Should it become necessary to <br /> enter tank a confined space entry permit will be obtained from the Company Safety Officer prior to the entry of <br /> any worker into a confined space,and the standard operating procedure(SOP) for confined space entry shall be <br /> followed. <br /> - Ensure that all pipes entering into the confined space have been disconnected and sealed. <br /> - Remove any liquids or sludges from the confined space. <br /> - Ventilate the confined space with fresh air. The ventilation mechanism should be explosion proof. <br /> - Test the atmosphere of the confined space with a oxygen/combustible meter. The oxygen content <br /> of the space must be between 14.5 and 22.0% and the LEL indication below 10% before <br /> personnel can enter the confined space. <br /> - Monitor the concentration of Benzene, Toluene, Xylene, and Ethel Benzene in the space. If the <br /> concentration of Benzene exceeds .005 ppm, or any other the other vapors exceed 100 ppm, do not <br /> enter the space. <br /> - Personnel entry into any excavation five feet deep or greater is only permitted if the walls are <br /> properly shored or sloped. A ladder shall be provided and placed at an angle not more than 30 <br /> degrees from vertical, and secured as necessary. Ladder side rails shall extend at least three feet <br /> above the ground surface. <br /> - Install extraction devices over the confined space. <br /> Provide a stand-by person for the confined space entry. <br /> Hold a pre-entry meeting to discuss the work task, on-site communications, and emergency <br /> procedures. <br /> Monitoring of the confined space shall be on-going throughout the entry. <br /> D-5 <br />