Whenever anyone is digging deeper than one foot in the ground, they are required to place a call to PA One Call. The call must be placed three days in advance (unless it is an emergency) and the dig area must be outlined, usually in white. Once the call is placed, every agency that has lines in that vicinity are required to go to the site and mark the locations of where their underground lines are in relation to the area to be excavated. Each agency marks in a different color. (i.e. sewers and drains in green, power lines in red, etc.)
If you have any questions about a proposed dig in your area, call 800-242-1776 or visit PA One Call's website. Please note, home improvements on a weekend do not qualify as an emergency.