“Tolerance zone” means an area surrounding an underground facility, which is equal to the width of the underground facility plus 18 inches measured horizontally on either side of the underground facility.

Source. #7350, eff 8-23-00; ss by #7900, eff 5-29-03; ss and moved by #9318, eff 11-8-08 (from Puc 802.15); ss by #12102, eff 2-8-17