Just below the surface is a network of buried infrastructure – this could be a water line, a pipeline that transports oil or natural gas, or cables and wires for telecommunications. You could unintentionally damage these utilities and create a risk to your own safety and others if you don’t take the proper precautions before you break ground.

One Call is a free service that helps you know what’s below. You can visit clickbeforeyoudig.com to identify your local One Call service that will locate buried infrastructure in your project area. It should always be the first step before starting any project involving ground disturbance.

Have you ever wondered what happens after you place a locate request and receive a One Call ticket?


When you make a locate request through your local One Call centre, a ticket is assigned and member companies who may have buried infrastructure within your dig area, including Trans Mountain, are informed. Your ticket confirmation then follows.

The One Call ticket, including your work/project information, is sent within minutes to a portal application named Trans Mountain One Call or (TMOC.) Our Pipeline Protection inspectors receive your ticket details via text and email to determine if the activity could impact the pipeline. Their review includes cross-referencing your proposed work location against our pipeline alignment. The inspector may also contact you directly to confirm ticket details. If your project is outside the 30 metres (100 feet) of the Trans Mountain pipeline, you will receive our notification within two working days in Washington state (three working days in Canada) that your work may proceed, subject to a response from any other utility owners in the dig area. This closes the ticket. All correspondence is documented in TMOC.

If your ticket shows the work is within 30 metres (100 feet) of the Trans Mountain pipeline, the inspector will contact you to discuss permitting requirements and arrange a site meeting to locate and mark the pipeline and explain the markings. The inspector will document that the pipeline or facilities have been marked at the proposed activity area. Once your work is complete, all documentation, including the original One Call ticket and correspondence history, is saved in our TMOC system, and the inspector closes the ticket.

Please remember to make a One Call before starting any ground disturbance project. This FREE service helps enhance your safety, the safety of workers, the community and the environment.