SC Grading Practice Questions - South Carolina Grading Contractor Examination Exam

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Where oxygen deficiency or a hazardous atmosphere could reasonably exist, OSHA requires the atmosphere in excavations greater than 4 feet deep to be tested before entry. Oxygen deficiency means less than:

16.0% oxygen 23.5% oxygen 21.0% oxygen 19.5% oxygen

Correct Answer:

19.5% oxygen

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