Under California's Title 8 regulations for lead exposure in construction, what is the permissible exposure limit (PEL) for lead that triggers the requirement for initial medical surveillance?
Correct Answer
A) 50 micrograms per cubic meter averaged over an 8-hour period
Title 8 CCR Section 1532.1 establishes the PEL for lead in construction at 50 micrograms per cubic meter (50 μg/m³) as an 8-hour time-weighted average. When this level is exceeded, employers must implement medical surveillance programs, including initial medical examinations and periodic monitoring of affected employees.
Why This Is the Correct Answer
Title 8 CCR Section 1532.1 establishes the PEL for lead in construction at 50 micrograms per cubic meter (50 μg/m³) as an 8-hour time-weighted average. When this level is exceeded, employers must implement medical surveillance programs, including initial medical examinations and periodic monitoring of affected employees.
Why the Other Options Are Wrong
Option B: 40 micrograms per cubic meter averaged over an 8-hour period
40 μg/m³ is the action level (AL) for lead in construction, not the PEL. The action level is a lower threshold that triggers initial exposure monitoring and some protective measures, but the PEL — which triggers mandatory medical surveillance — is 50 μg/m³.
Option C: 100 micrograms per cubic meter averaged over an 8-hour period
100 μg/m³ is significantly above the actual PEL of 50 μg/m³. No regulatory standard uses 100 μg/m³ as a PEL for lead in California construction. This number may be confused with OSHA general industry standards from older regulations.
Option D: 30 micrograms per cubic meter averaged over an 8-hour period
30 μg/m³ is below the action level of 40 μg/m³. While some biological exposure indices exist near this range, 30 μg/m³ is not used as a PEL or action level trigger in California's Title 8 construction lead standard.
Memory Technique
Use '50 for PEL' — think of a 50-mph speed limit: once you exceed it, you've crossed the line and mandatory consequences kick in. The action level at 40 is like a 'caution zone' before the limit. 50 = PEL = medical surveillance required.
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