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.
(See Practice Statement 5–20.)
- Existing state laws, including New Mexico, Pennsylvania, South Dakota, and others
- Telecommunications Industry Association and Electronic Industry Association (TIA/EIA), “Standard for Physical Location and Protection of Below-Ground Fiber Optic Cable Plant” (ANSI/TIA/EIA-590-A-1996)
- American Public Works Association (APWA), “Guidelines for Uniform Temporary Marking of Underground Facilities”