AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

Which condition requires classifying an underground operation as gassy under OSHA 1926.800?

A single 5 percent LEL reading that is immediately ventilated below 5 percent Spoil piled more than 2 feet from a surface trench Use of a laser for TBM guidance 10 percent or more of the LEL for three consecutive days, or ignition of methane or flammable gas from the strata, or connection to a currently gassy area with continuous air containing the gas

Correct Answer:

10 percent or more of the LEL for three consecutive days, or ignition of methane or flammable gas from the strata, or connection to a currently gassy area with continuous air containing the gas

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