AZ ROC C-57 Wrecking Practice Questions - Arizona ROC C-57 Wrecking Examination Exam

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Before flame-cutting or demolishing an underground fuel storage tank (UST) removed from a demolition site, what Lower Explosive Limit (LEL) threshold must be verified with a calibrated combustible gas indicator?

Less than 25% LEL Less than 10% LEL Less than 50% LEL Exactly 0% LEL with no oxygen present

Correct Answer:

Less than 10% LEL

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