Mich. Admin. Code R. 408.40934 - Hazardous atmospheres; testing and controls
Rule 934. To prevent exposure to harmful levels of atmospheric contaminants and to assure acceptable atmospheric conditions, all of the following requirements shall apply:
(a) Where an oxygen deficiency (an atmosphere
that contains less than 19.5% oxygen) or a hazardous atmosphere exists, such as
in excavations in areas where hazardous substances are stored nearby, the
atmosphere in the excavation shall be tested before employees enter excavations
that are more than 4 feet (1.22 m) deep.
(b) Precautions shall be taken to prevent
employee exposure to atmospheres that contain less than 19.5% oxygen and any
other hazardous atmosphere. These precautions include providing proper
respiratory protection or ventilation in accordance with the requirements of
this part.
(c) Precautions shall be
taken, such as providing ventilation, to prevent employee exposure to an
atmosphere that contains a concentration of a flammable gas in excess of 20% of
the lower flammable limit of the gas.
(d) When controls are used that are intended
to reduce the level of atmospheric contaminants to acceptable levels, testing
shall be conducted as often as necessary to ensure that the atmosphere remains
safe.
Notes
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