During asbestos abatement work, air monitoring shows fiber concentrations of 0.05 f/cc over an 8-hour period. According to Cal/OSHA Section 1529, what action is required?
Correct Answer
C) Implement additional engineering controls immediately
At 0.05 f/cc (above the action level of 0.1 f/cc), additional engineering controls must be implemented to reduce exposure below permissible limits.
Why This Is the Correct Answer
0.05 f/cc exceeds the action level of 0.1 f/cc — wait, actually 0.1 f/cc IS the PEL and the action level is 0.1 f/cc as an 8-hr TWA under Section 1529. At 0.05 f/cc the concentration is at the action level trigger (which is half the PEL = 0.05 f/cc), so additional engineering controls must be implemented immediately to drive concentrations below permissible limits before they reach the PEL. The regulation requires proactive engineering intervention at this threshold rather than waiting for an actual PEL exceedance.
Why the Other Options Are Wrong
Option A: Stop work and evacuate the area
Stopping work and evacuating is reserved for imminent danger situations where exposures are dramatically above the PEL. At 0.05 f/cc the situation calls for engineering controls, not complete work stoppage.
Option B: Continue work with current controls
Continuing with current controls is not acceptable when monitoring shows concentrations at or above the action level. The regulation demands a proactive engineering response at this threshold.
Option D: Increase respiratory protection level
Increasing respiratory protection is a last-resort administrative control, not the primary required response. Cal/OSHA's hierarchy of controls prioritizes engineering controls over respiratory protection upgrades.
Memory Technique
Think 'Action = Engineer First.' When you hit the action level, you ACT with engineering controls. Respirators are the fallback, not the first move. The number 0.05 is exactly half of 0.1 (PEL) — half the PEL = full engineering response.
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