An outdoor construction project in Sacramento experiences temperatures reaching 103°F. Under Cal/OSHA heat illness prevention requirements, what additional measure becomes mandatory at this temperature?
Correct Answer
B) Observation of employees for signs of heat illness
Cal/OSHA Section 3395 requires employers to observe employees for signs and symptoms of heat illness when temperatures reach or exceed 95°F, with enhanced observation at higher temperatures.
Why This Is the Correct Answer
Cal/OSHA Section 3395 creates a two-tiered response to high heat. At 80°F and above, baseline requirements apply (water, shade, training). When temperatures reach 95°F or above, an additional requirement activates: employers must observe employees for signs and symptoms of heat illness. At 103°F, this enhanced observation requirement is clearly triggered. The regulation specifies that at high temperatures, observation is mandatory — not optional.
Why the Other Options Are Wrong
Option A: Work must be suspended
Cal/OSHA does not require work suspension at any specific temperature threshold. The standard requires enhanced precautions and monitoring as temperatures rise, but complete work stoppage is not mandated. Suspending work would be an extreme overreaction beyond what the regulation requires.
Option C: Mandatory 15-minute breaks every 30 minutes
Mandatory 15-minute breaks every 30 minutes is not a specific requirement in Cal/OSHA Section 3395. The standard requires preventative cool-down rest periods (minimum every 2 hours at 95°F+) but does not prescribe the specific 15/30 minute interval as a regulatory mandate.
Option D: Ice vests must be provided to all workers
Ice vests are not mandated by Cal/OSHA Section 3395 at any temperature threshold. While they are a useful cooling tool, the regulation focuses on shade, water, rest, and observation as the core requirements. Mandating ice vests would impose an unspecified equipment requirement that goes beyond the regulation's text.
Memory Technique
Remember the '95°F Observation Switch': below 95°F, standard precautions; at or above 95°F, flip the observation switch ON. Sacramento regularly exceeds 95°F in summer, so this is not a hypothetical scenario — it is the everyday operational reality for California contractors.
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