You are assigned to dig a trench with an excavator for a new storm sewer. The ground disturbance permit indicates underground electrical cables and a water main are present. What is the accepted safe excavation practice when working within the hand-dig area (e.g., 1.0 metre on either side of the utility)?

Question: You are assigned to dig a trench with an excavator for a new storm sewer. The ground disturbance permit indicates underground electrical cables and a water main are present. What is the accepted safe excavation practice when working within the hand-dig area (e.g., 1.0 metre on either side of the utility)?

Answer options:

• Using a small excavator bucket, being extra careful. ✅ Employing a hydrovac or hand digging methods.
• Digging with the bucket until the utility is visually exposed.
• Pushing the bucket through the soil slowly to feel for resistance.

Correct answer: Employing a hydrovac or hand digging methods.

Explanation: Within the hand-dig area or 'tolerance zone' (typically 1.0 metre or 3 feet on either side of a marked utility), safe excavation practices mandate using non-destructive methods like hydrovac or hand digging. This minimizes the risk of damaging vital infrastructure.