There are lots of different color lines marked on my jobsite. How do I know which color represents which type of utility?

Red electric power lines, cables, conduit, and lighting cables
Orange telecommunication, alarm or signal lines, cables, or conduit
Yellow natural gas, oil, steam, petroleum, or other gaseous or flammable material
Green sewers and drain lines
Blue potable (drinking) water
Purple reclaimed water, irrigation, and slurry lines
White proposed excavation limits or route