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CONFIDENTIAL The level of flammability having been confirmed as very safe (<10% LFL), an oxygen monitor was used to ascertain that the atmosphere was in the safe breathing range. Then one of the crew members donned a safety harness, a Tyvek protective garment, heavy rubber boots and gloves, and a positive pressure air-supplied respirator with full-face enclosure. A tripod with a winch was erected above the tank opening. The cable from the winch was fastened to the steel hook of the safety harness and then the crew member descended into the tank. Figure 6 shows this person about to enter the tank. A second crew member stood at the tank opening throughout the sludge- cleaning operation, monitoring the work and carrying on a conversation to assure alertness of the person in the tank. The third crew member carried out support duties such as obtaining supplies from the trailer, emptying buckets of sludge into barrels, etc. Throughout this operation a continuous supply of air was blown into the tank from a squirrel-cage blower through a 12-in hose. Thus, the person in the tank not only was being supplied positive pressure air into his full-face head enclosure, but the air in the tank was also safe to breathe. In addition to this, a back-up tank of compressed air was also placed in the tank. The two crew members outside the tank also wore respirators, although not of the positive pressure type with full-face enclosure; these devices were cartridge respirators that covered the mouth and nose area and breathing was through canisters on either side. In fact, all of the crew members wore these respirators at all times if they were working near the tank, to avoid possible long-term effects of breathing fuel vapors. During the sludge cleanup, all tools used were nonsparking. A plastic shovel, plastic dust pan, and plastic buckets were used, along with a wood and fiber broom. Several buckets of petroleum absorbent material were also used to soak up the liquids. The work was'done without the benefit of internal lighting, as naturally reflected sunlight was adequate for this part of the operation. Sandblasting and spraying of the coating were also observed and found to be as described earlier. During the process, a prefabricated thick steel plate with.prepunched holes was brought out of the trailer, sandblasted on both sides, and sprayed on both sides with the lining material. Safety procedures were extremely good. We reviewed the paper work for this site. The paper work consisted of the company's safe entry permit form, a site-specific emergency plan (phone numbers, locations of and directions to hospitals, etc.), and the minutes from their weekly tail-gate safety meeting. During one of our visits a local fire marshall was also present and checking on their procedures (which he found satisfactory). MR1-Aw1i0M4M-FR 11