What Counts as Excavation and Why It Kills

Ground disturbance means any work that breaks the ground surface: digging a trench for a cable, a pit for a valve, a foundation, a borehole, driving a fence post or a ground anchor, or even hand-digging a trial hole. An excavation is any cut, trench, pit or hole made by removing earth. Small, shallow and short jobs are included. Many serious incidents happen in jobs that were thought too small to plan.

This course is for supervisors, engineers, permit issuers and experienced workers who plan or control excavation work. It assumes general site safety knowledge, and focuses on choosing the right controls for real ground and real conditions.

Two short cases

The fence post. A contractor drove steel fence posts along a site boundary with a post driver. Nobody thought of it as excavation, so no service check was done. The fourth post went through a low-voltage cable. The operator was not hurt because the driver's frame was insulated, but the site lost power for a day.

The quick repair. A two-person crew dug a 1.8-metre trench to repair a leaking water pipe. It was "only a quick job", so they did not use support. While one worker was kneeling at the bottom, a section of the side fell in on his legs and lower body. He survived, but with serious injuries. The trench had been open for less than an hour.