A contractor discovers lead-based paint during renovation of a building constructed in 1968. The project involves dry scraping 800 square feet of painted surface. What is the Cal/OSHA permissible exposure limit (PEL) for lead in construction?
Correct Answer
C) 50 μg/m³ as an 8-hour TWA
Cal/OSHA sets the PEL for lead in construction at 50 μg/m³ as an 8-hour time-weighted average.
Why This Is the Correct Answer
Cal/OSHA's lead standard for construction (Title 8, Section 1532.1) sets the permissible exposure limit (PEL) at 50 micrograms per cubic meter (μg/m³) measured as an 8-hour time-weighted average (TWA). This is consistent with federal OSHA's construction lead standard and represents the maximum airborne concentration to which workers may be exposed without additional controls.
Why the Other Options Are Wrong
Option A: 100 μg/m³ as an 8-hour TWA
100 μg/m³ is the action level threshold used in some industrial contexts but is not the PEL for construction lead exposure. Confusing the action level with the PEL is a common error; the PEL is set at the lower value of 50 μg/m³ to provide greater worker protection.
Option B: 200 μg/m³ as an 8-hour TWA
200 μg/m³ is twice the actual PEL. This figure does not correspond to any standard threshold in California or federal OSHA lead regulations for construction. At this level of exposure, serious health risks would be present.
Option D: 30 μg/m³ as an 8-hour TWA
30 μg/m³ is below the actual PEL and does not correspond to the Cal/OSHA standard. While this level might trigger certain monitoring or notification requirements in some contexts, it is not the PEL for construction lead exposure under Cal/OSHA.
Memory Technique
Remember: 'Fifty is the Limit' — 50 μg/m³ is the PEL for lead in construction. Think of it as the speed limit: you trigger monitoring at 30 (the action level), but you're breaking the law at anything over 50 (the PEL). 30 = warning zone, 50 = the limit.
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