An excavation is 5 ft deep beside a former fuel line, and a hazardous atmosphere could reasonably exist. What atmospheric check is required before employees enter?
Correct Answer
B) The atmosphere must be tested before entry when the excavation is over 4 ft deep and a hazardous atmosphere could reasonably be expected
OSHA 1926.651(g)(1)(ii) requires testing before employees enter excavations greater than 4 ft deep where oxygen deficiency or a hazardous atmosphere exists or could reasonably be expected to exist. Other choices wait too long or use the wrong depth trigger.
Why This Is the Correct Answer
OSHA 1926.651(g)(1)(ii) requires testing before employees enter excavations greater than 4 ft deep where oxygen deficiency or a hazardous atmosphere exists or could reasonably be expected to exist. Other choices wait too long or use the wrong depth trigger.
Why the Other Options Are Wrong
Option A: Assume no atmosphere test is needed if workers can smell fuel
The trap in A is No test is needed if workers can smell fuel. That selection is wrong because the option does not produce the required Hazardous atmosphere outcome, The atmosphere must be tested before entry when the excavation is over 4 ft deep and a hazardous.
Option C: Testing is required only for excavations deeper than 20 ft
Choice C (Testing is required only for excavations deeper than 20 ft) is rejected because Testing is required only for excavations deeper than 20 ft is a different published number than the cited Hazardous atmosphere value; 29 CFR 1926.651(g)(1)(ii) supports The atmosphere must be tested before entry when the excavation is over 4 ft deep and a hazardous atmosphere could reasonably be expected.
Option D: Testing may wait until the first employee reports symptoms
In site construction, Testing may wait until the first employee reports symptoms is the wrong selection for Hazardous atmosphere: it leaves the work at an informal or incomplete stage, while Hazardous atmosphere requires The atmosphere must be tested before entry when the excavation is over 4 ft deep and a hazardous.
Memory Technique
Make hazardous atmosphere a tabbed card: cite the exact condition, then choose The atmosphere must be tested before entry when the excavation is over 4 ft deep and a hazardous atmosphere could reasonably be.
Reference Hint
Open 29 CFR Part 1926, Subpart P - Excavations; use 29 CFR 1926.651(g)(1)(ii) to confirm that OSHA 1926.651(g)(1)(ii) requires testing before employees enter excavations greater than 4 ft deep where oxygen deficiency or a hazardous atmosphere exists or could reasonably be expected to exist.
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