DIYers

Tolerance Zone

The Tolerance ZoneIt’s the law

By law, each type of marking requires that you observe a certain Tolerance Zone.

If the diameter of the buried facility is known, the Tolerance Zone is the distance of one-half of the known diameter plus 2 feet, on either side of the designated center line. If the diameter of the buried facility is not known, the Tolerance Zone is 2 feet on either side of the designated center line.

Can you find the Tolerance Zone? Click the interactive module below to find out!

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