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t also be locked out by the person planning the entry. (2) Empty the Tank. The tank must be completely emptied. Its contents will be transferred to another tank, or a tank truck on site. Any sludges and/or sediments will be fully removed, tested, and either processed or disposed of, as appropriate. The interior surfaces of the tank will then be cleaned from the outside with brushes, squeeges, and then steam cleaned, if required, to provide a clean surface for inspection. (3) Perge a._d Ventilate the Tank. Using a flexible duct, direct fresh air to the tank bottom and maintain flow until twenty (20) tank volumes of air have passed through the tank. No entry can be considered until twenty percent (20%) oxygen is read on a suitable meter. (4) Tank Entry Permit. A tank entry permit must be prepared before entry for inspection. A permit to enter shall be approved by the technical director. The tank may then be entered by personnel wearing adequate protective clothing. The self-contained or combination air supplied ' breathing appe itus, complete with an escape -type air cylinder should be worn by all employees entering the tanks. The escape tank allows safe escape if the air supply system is interrupted. No tank inspection can be performed unless two (2) trained observers are available outside the tank. The observers must satisfy the following requirements: (i) wear the same protective clothing and equipment specified for the inspector, (ii) be connected to the inspector by lifeline, (iii) be able to communicate easily with the inspector, and (iv) rA able to summon additional help rapidly in the event of an emergency. The internal tank inspection will start with a visual inspection of any internal supports. The inspection will then proceed down the sides of the tank to the bottom. All seams and surfaces will be closely checked for evidence of cracks, fissures, 32.