OSHA 10-Hour Construction ReviewExcavationsMedium
A worker is installing a new sewer line in a trench that is 9 feet deep. The trench has been properly shored, but the worker notices a strong, unusual odor emanating from the excavation. Which of the following is the immediate and most appropriate action the worker should take?
- APut on a respirator and continue working to complete the task.
- BAttempt to identify the source of the odor before exiting.
- CContinue working, but notify the competent person at the end of the shift.
- DImmediately exit the trench and notify the competent person.
Show answer & explanationAnswer & explanation
Correct answer: D. Immediately exit the trench and notify the competent person.
Any unusual odor in an excavation, especially one 9 feet deep, could indicate the presence of hazardous gases (e.g., methane, hydrogen sulfide from decaying organic matter, or chemical leaks). OSHA requires immediate evacuation when such hazards are suspected, followed by notification of the competent person for atmospheric testing and hazard control.
Why the other options are wrong
- A. Entering or remaining in a potentially hazardous atmosphere with only a respirator is unsafe without proper testing and knowing the specific hazard and respirator effectiveness.
- B. Attempting to identify the source without proper equipment or training is dangerous and delays essential evacuation.
- C. Delaying notification and continuing work could expose the worker to immediate danger.
Atmospheric Hazard Response
In excavations, any suspicion of hazardous atmospheres, indicated by unusual odors or other signs, requires immediate evacuation, notification of the competent person, and atmospheric testing before re-entry.
- Unusual odors can indicate hazardous gases.
- Immediate evacuation is paramount.
- Competent person must conduct atmospheric testing.
- Never attempt self-identification of unknown hazards.
Memory trick: Smell something odd? GET OUT and CALL the boss!