During the installation of new gas lines by Pacific Gas and Electric Company (PG&E), some private sewer laterals may have been pierced or completely bored through - known as a cross bore. Underground Service Alert (USA) does not typically mark private sewer laterals when out marking utilities. As a result, cross bores may go undetected, and if pipe has been damaged, create a potentially hazardous situation. For gas line cross bore information, visit PG&E's website. A review of a closed-circuit television (CCTV) inspection should also include looking for evidence of cross bore. If you suspect a gas line cross bore, call PG&E at 800-743-5000. If you suspect a gas leak, warn inhabitants, evacuate the area and call 911 and PG&E at 800-743-5000.