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What is the tolerance zone?

April 26, 2017tolerance zone

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What is the tolerance zone?

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A buffer that extends one half of the utility line’s known diameter plus two feet on either side of the center line. If the diameter of the underground facility is not known, the tolerance zone is two feet on either side of the designated center line. Hand tools are required when working in the tolerance zone until the exact facility location is verified. Click here for a helpful diagram.