AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

What is the primary purpose of probe drilling ahead of a tunnel face?

To detect water, voids, or gas before the heading advances into them To replace survey control so lasers are no longer needed To measure concrete slump in the invert pour To determine the legal One-Call ticket expiration date

Correct Answer:

To detect water, voids, or gas before the heading advances into them

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