Under Cal/OSHA Title 8, Section 1532.1, what is the maximum allowable lead exposure limit (PEL) for construction workers over an 8-hour time-weighted average?
Correct Answer
D) 50 μg/m³
Cal/OSHA Section 1532.1 establishes the permissible exposure limit (PEL) for lead in construction at 50 micrograms per cubic meter over an 8-hour TWA.
Why This Is the Correct Answer
Cal/OSHA Section 1532.1 sets the Permissible Exposure Limit (PEL) for lead in construction at 50 micrograms per cubic meter (μg/m³) as an 8-hour time-weighted average. This is the maximum allowable exposure before mandatory full compliance measures are required.
Why the Other Options Are Wrong
Option A: 30 μg/m³
30 μg/m³ is the Action Level (AL), not the PEL. Exceeding the AL triggers initial compliance requirements (medical surveillance, exposure monitoring), but the PEL — the maximum allowable limit — is higher at 50 μg/m³.
Option B: 100 μg/m³
100 μg/m³ far exceeds the Cal/OSHA PEL and represents a highly hazardous exposure level. This is not a recognized threshold in the lead standard.
Option C: 75 μg/m³
75 μg/m³ is not a recognized threshold in Cal/OSHA's lead standard. It falls between the PEL and other regulatory limits and has no specific regulatory significance.
Memory Technique
PEL = 50, AL = 30. Remember: 'Fifty is the Final limit, Thirty is the Trigger.' The AL at 30 triggers action; the PEL at 50 is the absolute ceiling.
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