Under Cal/OSHA Title 8, Section 1529, what is the minimum distance that warning signs must be posted around a Class I asbestos work area?
Correct Answer
D) 50 feet
Cal/OSHA Section 1529 requires warning signs to be posted at a minimum distance of 50 feet around Class I asbestos work areas to protect unauthorized personnel.
Why This Is the Correct Answer
Cal/OSHA Section 1529 requires warning signs and barriers for Class I asbestos work (the highest-risk category, involving removal of thermal system insulation and surfacing materials) to be posted at a minimum of 50 feet from the regulated work area to protect unauthorized personnel from inadvertent exposure.
Why the Other Options Are Wrong
Option A: 100 feet
100 feet exceeds the regulatory minimum. While greater distance provides more protection, the question asks for the minimum required, which is 50 feet.
Option B: 25 feet
25 feet is only half the required distance. This would not provide adequate warning distance for airborne asbestos fiber drift.
Option C: 10 feet
10 feet is far too close. At this distance, bystanders could easily enter the regulated area before seeing the warning, and airborne fibers could already be at dangerous concentrations.
Memory Technique
Class I = highest danger = 50 feet. Think: 'Class I at fifty, class one is shifty' — it moves the most dangerous fibers the farthest away.
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