You are operating an excavator near an existing sidewalk that is 1.0 metre from the edge of your planned excavation. The excavation will be 2.8 metres deep in Type 3 soil. What is the minimum horizontal distance the spoil pile from this excavation must be from the sidewalk edge, according to best practice and regulatory intent?

Question: You are operating an excavator near an existing sidewalk that is 1.0 metre from the edge of your planned excavation. The excavation will be 2.8 metres deep in Type 3 soil. What is the minimum horizontal distance the spoil pile from this excavation must be from the sidewalk edge, according to best practice and regulatory intent?

Answer options:

• 0.6 metres from the excavation edge (the existing sidewalk provides buffer)
• 1.0 metre from the excavation edge (to equal the sidewalk distance) ✅ Minimum 0.6 metres from the nearest edge of the excavation, but further back to protect the sidewalk.
• At a distance equal to the excavation depth, as it's a municipal property.

Correct answer: Minimum 0.6 metres from the nearest edge of the excavation, but further back to protect the sidewalk.

Explanation: While 0.6m from the excavation edge is the minimum, best practice, especially near existing infrastructure like sidewalks, is to place spoil further back to avoid undermining the sidewalk, causing cracking, or presenting a tripping hazard, consistent with the spirit of Alberta OHS Code Part 32, Section 449(1).