Call Before You Dig

Before you dig or excavate with mechanized equipment on your property, the law requires you to notify all utilities at least 48 hours in advance so that underground lines can be located and clearly marked. (This excludes the day you call, weekends, and holidays.)

So, before you dig with mechanized equipment, call 8-1-1.  It's toll-free.  http://www.call811.com
 The UPC's motto is Georgia CARES:

Call Before You Dig
Await the Required Time
Respect the Marks
Excavate (Dig) With Care
Safety Is Everyone's Responsibility

For more information, visit the Utilities Protection Center of Georgia at www.gaupc.com