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664 HAZWOPER for General Site Workers V
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Identifying Potential Atmospheric Hazards

Per 1910.120(c)(3), All suspected conditions that may pose inhalation or skin absorption hazards that are immediately dangerous to life or health (IDLH) or other conditions.

Confined Spaces: Safe Yesterday, Deadly Today

For instance, oxygen-deficient atmospheres (less than 19.5% O2 by volume), that may cause death or serious harm must be identified during the preliminary survey and evaluated during the detailed survey.

Other examples of identified hazards include potentially explosive or flammable situations, visible vapor clouds, or areas where biological indicators such as dead animals or vegetation are located.

Knowledge Check Choose the best answer for the question.

1-5. When must all suspected conditions that are immediately dangerous to life or health (IDLH) be identified?