Best Practices Version 17.0

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Tolerance Zone

BEST PRACTICES CHAPTER 5 - EXCAVATION

Practice Statement 5-19: Excavation Tolerance Zone: The excavator observes a tolerance zone that is comprised of the width of the facility plus 18 in. on either side of the outside edge of the underground facility on a horizontal plane. This practice is not intended to preempt any existing state/provincial requirements that currently specify a tolerance zone of more than 18 in.

The following examples are of tolerance zones for a 1 in. and 12 in. line:40

 

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