Ground Disturbance Planning and Hazard Assessment
Start with a plan, not a shovel
Every ground disturbance begins with a documented plan. The core concepts are scope definition (what activity, what depth, what footprint), a hazard assessment that covers both buried and surface hazards, and a written safe work procedure that ties controls to identified risks. Candidates must understand the hierarchy of controls and know that planning must occur before any ground is broken, including hand digging, augering, and landscaping.
What a hazard assessment must capture
A defensible assessment identifies buried facilities (pipelines, cables, conduits), soil and stability conditions, adjacent structures and utilities, traffic and public exposure, atmospheric hazards in confined or trench settings, and environmental sensitivities. It also assigns controls, owners, and completion dates. Traps in questions include treating a hazard assessment as a one-time paper exercise, or confusing a field-level hazard assessment with a formal project risk review.
Traps to watch
- Assuming "shallow" work is exempt. Many jurisdictions apply ground disturbance rules to any penetration, regardless of depth.
- Reusing an old assessment without confirming conditions are unchanged.
- Confusing a hazard assessment with a locate request; they are separate steps.
Rule of thumb
The 15-metre (50-foot) tolerance zone concept: within a set distance of a buried facility, mechanical excavation is restricted and hand exposure is required. Confirm the exact distance in your jurisdiction, but the planning principle is to treat the tolerance zone as a hard boundary drawn on the plan.
Worked example: A crew plans to install fence posts 0.6 m deep along a property line. The planner identifies a buried gas line crossing the line, marks the tolerance zone, requires hand digging within it, and documents a standby plan. The plan is signed before work starts.