AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

When may a gassy underground operation be declassified to potentially gassy under OSHA 1926.800?

As soon as one handheld reading is below 20 percent of the LEL When flammable gas stays under 10 percent of the LEL for three consecutive days After any lunch break if no one smells gas Only after the tunnel is fully lined and the contract is closed

Correct Answer:

When flammable gas stays under 10 percent of the LEL for three consecutive days

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