AL Water Projects Practice Questions - Alabama Water Projects Contractor Examination Exam

If flammable gas may be present in a water-project excavation, exposure must be prevented above what concentration?

20 percent of the lower flammable limit (LFL) 100 percent of the lower flammable limit The upper explosive limit only Any reading below 50 percent methane by volume is acceptable

Correct Answer:

20 percent of the lower flammable limit (LFL)

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