A confined space entry requires continuous atmospheric monitoring. The oxygen level drops to 18.5% during work. What action should be taken immediately?
Correct Answer
C) Evacuate all workers from the space immediately
OSHA requires oxygen levels to be maintained between 19.5% and 23.5% in confined spaces. At 18.5%, the space is oxygen-deficient and all workers must be evacuated immediately.
Why This Is the Correct Answer
OSHA 29 CFR 1926.95 mandates that confined spaces maintain oxygen levels between 19.5% and 23.5%. When oxygen drops below 19.5%, the space becomes immediately dangerous to life and health (IDLH). At 18.5% oxygen, workers face serious risk of unconsciousness, impaired judgment, and potentially fatal oxygen deficiency. Immediate evacuation is the only acceptable response to protect worker safety.
Why the Other Options Are Wrong
Option A: Document the reading and continue monitoring
Continuing work while increasing ventilation is dangerous because workers are already exposed to oxygen-deficient atmosphere. Even with increased ventilation, it takes time to restore safe oxygen levels, and workers could lose consciousness or suffer serious health effects during that time.
Option B: Continue work but increase ventilation
Switching to supplied air respirators does not address the immediate danger and takes valuable time during which workers remain at risk. The priority is immediate evacuation, not changing equipment while exposed to hazardous conditions.
Memory Technique
Think '19.5 = EVACUATE' - below 19.5% oxygen means everyone gets out immediately, no discussion, no alternatives.
Reference Hint
OSHA 29 CFR 1926.95 - Personal Protective Equipment, Confined Space Entry requirements
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