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d. Confined Space Entry <br />A confined space entry must be approved by Aronson Engineering Company Safety Officer. Contaminated soil <br />excavations may pose additional hazards such as air contamination, flammable or explosive atmosphere, and <br />oxygen deficiency. Entry into trenches and excavations meets the definition of a confined space. All confined space <br />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 enter tank <br />a confined space entry permit will be obtained from Aronson Engineering Company Safety Officer prior to the] <br />entry of worker into a confined space, and the standard operating procedure (SOP) for confined space <br />entry shall be 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 19.5 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 />