(A) Do not enter any confined space without knowing what is in it, what was in it, and what precautions should be taken;
(B) Test the atmosphere with gas detection equipment to determine if there are any toxic, explosive, or flammable gases and sufficient oxygen to support life. Do not enter the confined space to make these tests. Lower the unit in with a rope;
(C) Purge the involved space with steam, water, compressed or fresh air, using exhaust or blowing devices. (Explosion-proof devices are needed for purging areas with flammable vapor.) Retest the atmosphere after purging;
(D) Close and blank out any supply lines, chutes and pipes to the confined space in which work is being done. Continue to monitor the atmosphere in a confined space frequently, even if it was “safe” when work began; and
(E) Anyone entering a hazardous atmosphere must be backed up by another worker similarly equipped to assist him or her in any emergency. A third person should be within sight and hearing of this work and be informed that men or women are going into the confined space.
(1978 Code, § 8.28.030) (Ord. 92-2, passed - -1992)