APWA Uniform Color Code
Understand the location marks. Each type of buried utility has its own color code. Marks may be painted or located with flags.
||Electric, Cables, Conduit, Lighting Cables
||Natural Gas, Oil, Steam, Petroleum
||Communication, Phone, Cable, Fiber Optic
||Temporary Survey Marking
Dig Carefully. Once lines have been properly marked, carefully hand dig with a shovel around the marked areas. Also consider designing your project to avoid digging close to the underground facilities. Never use mechanized equipment near marks or exposed pipes or wires. Remember that utility marks will not indicate depth, and settling ground, erosion and other factors cause the location of pipes and wires to change over time.