Safe Excavation and Ground Disturbance Practices
Control the excavation, control the risk
Safe practice means applying the plan in the field: exposing buried facilities by hand within tolerance zones, using soft-dig or vacuum methods where appropriate, and keeping mechanical equipment at a safe distance. Candidates must understand spoil placement, access and egress, shoring and sloping requirements, and the need to protect locate marks. Traps include believing a spotter alone makes mechanical digging near a facility safe, or assuming a trench box removes the need for a competent person's inspection.
Exposure, inspection, and changing conditions
Once a facility is exposed, it must be supported and protected, and the excavation must be inspected regularly and after events such as rain or vibration. Atmospheric testing applies where hazards may exist. Backfilling requires care to avoid damaging facilities, and any contact with a buried facility must be reported and the work stopped.
Traps to watch
- Digging below the marked depth without confirming the facility's actual depth.
- Leaving an excavation unattended without barricades or covers.
- Assuming a locate mark is the exact centreline rather than an approximate position.
- Failing to stop work after striking or scraping a facility, even without visible damage.
Rule of thumb
Hand-expose before you trust: within the tolerance zone, expose the facility by hand to confirm its exact location and depth before any mechanical work continues.
Worked example: An operator exposes a conduit by hand, finds it 0.4 m shallower than the drawing indicated, adjusts the excavation plan, and documents the discrepancy before resuming.