4005 Port Chicago Hwy
Concord, CA 94520-1232
2 working days, but not more than 28 calendar days
Number of days in advance of a digging project that you need to notify the one call center of your intent to dig.
Marks Valid: 28 calendar days or when marks are no longer reasonably visible
Defines the period of time the facility marks (paint, flags, stakes, etc.) are valid according to state law or practice.