AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

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Before employees enter a surface excavation more than 4 feet deep where oxygen deficiency or a hazardous atmosphere could reasonably be expected, what must be done?

The atmosphere must be tested before entry Only a visual look from the bank is required Testing is required only if the excavation is more than 20 feet deep Employees may enter first and test after 15 minutes

Correct Answer:

The atmosphere must be tested before entry

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