3.6 Hours of Operation

One Call Center

Practice Statement:55

The one call center can process locate requests 24 hours per day, 7 days per week.

Practice Description:

The one call center has a process in place where an excavator who has a locate request can, at anytime of the day or night, every day of the year, contact the one call center and have that request processed.


  • Existing operating practices from various states’ one call centers
  • OCSI Resource Guide 2009
  • NTSB Safety Study (NTSB/SS-97/01; PB97-917003)


One Call Center One Call Center

Facility Owner Facility Owner

Excavator Excavator

Locator Locator

Project Owner Project Owner

Designer Designer