This handy all-in-one guide for contractors provides a safety checklist to prevent overhead and underground power line contacts. It emphasizes 811 and the CGA best practice of white-lining to pre-mark dig areas before a locate. It also tells what to do if a power line contact occurs or if an unmarked line is exposed while digging. Content supports the OSHA Cranes and Derricks in Construction Rule. Help keep workers safe on the job site with this two-sided quick reference that fits in a glove box or in a back pocket. Electric and natural gas version is also available.