Ground Disturbance Safety: Field Procedure and Locate Requirements

Locates, permits, hand-exposure zones, and the paperwork an inspector expects on site. A practical walkthrough of ground disturbance field procedure for Western Canadian crews.

Ground disturbance is one of the few hazard categories where the legislation defines the trigger as the act itself. The moment a crew intends to break ground with mechanical equipment, whether that is a mini-excavator on a fence line or a hand auger for a sign post, ground disturbance requirements apply. There is no minimum job size that exempts a crew from getting locates first.

This post covers the field mechanics, not the classroom side. If you are looking for background on why ground disturbance training exists and what a course covers, that is a separate topic. What follows is the sequence a crew actually runs on site: requesting the locate, turning that locate into a permit, working the hand-exposure zone once lines are marked, and having the right paperwork ready when an inspector, client representative, or auditor asks to see it.

Start With the Locate Request, Not the Shovel

In Alberta, locate requests go through Click Before You Dig Alberta, the utility notification service operated by Utility Safety Partners, the organisation formerly known as Alberta One-Call. A crew submits the dig site location and a description of the intended work, and that request is forwarded to every registered utility owner in the area. Each owner is responsible for marking or clearing its own buried infrastructure before work proceeds. BC, Saskatchewan, and Manitoba each run their own equivalent single-call locate services, and the process is functionally the same across every province On-Track serves: submit the request, wait for confirmation that all affected owners have responded, and do not disturb ground until the ticket says it is clear.

Locate marks follow the same colour code across the country, which matters for crews moving between job sites and provinces. Red marks electrical, yellow marks gas or oil, orange marks communications and cable, blue marks water, and green marks sewer or drain. White marks show the proposed excavation area itself, which the crew paints or stakes before the locate technician arrives so the utility owners know exactly what ground to check. A locate that comes back with no marks at all is not the same as a locate that has expired or was never requested. Confirm the ticket status before assuming a clear site.

The Permit to Dig Process

A locate ticket tells a crew what is buried nearby. It is not, on its own, authorization to start digging. That authorization comes from an internal ground disturbance permit, issued on site by a person with the training and authority to do so, before equipment breaks ground.

1. Confirm the locate ticket is active and covers the full area and depth of the planned work.
2. Walk the site and compare the physical locate marks against the ticket and a site sketch, noting any utility that appears unmarked or any mark that looks disturbed by weather, traffic, or prior work.
3. Identify any privately owned lines the public locate service does not cover, such as owner-installed irrigation, security conduit, or in-plant piping, and confirm those separately with the facility owner.
4. Complete the ground disturbance permit itself, recording the ticket number, the utilities marked, the equipment to be used, and any hand-exposure or hydrovac requirements.
5. Brief the crew on the permit before work starts, including who has stop-work authority if conditions change.

The permit is tied to the conditions on the day it is signed. If work runs past the locate ticket's validity period, if the ground is disturbed by heavy rain or frost heave, or if the scope of the dig changes, the permit needs to be reissued against a current locate rather than treated as a standing authorization for the life of the job.

Hand Exposure Zones Around Located Lines

A locate mark is an estimate, not a guarantee of exact depth or position. That is the reason ground disturbance procedure sets a hand-exposure zone around every located line: mechanical equipment stays out of that zone until the line itself has been exposed and visually confirmed using hand tools, an air knife, or hydrovac excavation. Only after the line is exposed and its actual position is known does mechanical equipment work closer, and even then it works parallel to the exposed line rather than across it wherever the dig allows.

Exposing the line at more than one point along the run, rather than a single spot, gives the crew a better picture of its actual depth and direction before mechanical equipment gets involved. Once a line is exposed, it needs physical protection for the rest of the job, whether that means supporting it, marking it clearly for other trades on site, or backfilling around it before leaving it unattended overnight.

What Documentation an Inspector Expects on Site

When an OHS officer, client safety representative, or auditor shows up at an active ground disturbance site, the paperwork they ask for is predictable. Missing any one of these is one of the most common findings on a site visit, and it is also exactly the kind of record an ACSA or Energy Safety Canada auditor pulls during the field verification portion of a COR or SECOR audit.

• The current locate ticket or confirmation number, matched to the actual work area.
• A signed ground disturbance permit for the day's work, including the equipment and hand-exposure requirements noted on it.
• A site sketch showing where locate marks were found relative to the planned excavation.
• A hazard assessment specific to that dig, not a generic template left unchanged from a different site.
• Training or competency records for whoever issued the permit and for equipment operators working near marked lines.
• Correspondence with any privately owned utility that fell outside the public locate service.
• A daily log if the excavation runs multiple days, since a permit issued on day one does not automatically cover day three.

Keeping this paperwork organized and accessible on site, rather than back at the office, is usually the difference between a clean inspection and a stop-work order. It is also the same documentation that supports a company's field safety program when it comes time for an internal audit or a client prequalification review.

When Field Conditions Do Not Match the Locate

Every crew eventually hits a site where the locate marks do not line up with what the ground actually shows, whether that is a line at an unexpected depth, an unmarked service the locate missed, or damage discovered mid-dig. The response is the same regardless of the cause: stop mechanical work in the affected area, secure the site, and contact the utility owner or locate provider before proceeding. Continuing to dig on the assumption that the original locate was close enough is how a marked but mispositioned line turns into a strike.

Ground disturbance procedure works because each step depends on the one before it: an accurate locate makes the permit meaningful, a properly issued permit sets up the hand-exposure work correctly, and complete documentation proves all of it happened when someone asks. Treating any one of those steps as optional is where the risk gets back into the job.