During a trenching operation, a sudden wall collapse traps a worker's leg. After ensuring the area is stable and calling 911, what is the *next* most important consideration before any attempt at rescue?

Question: During a trenching operation, a sudden wall collapse traps a worker's leg. After ensuring the area is stable and calling 911, what is the next most important consideration before any attempt at rescue?

Answer options:

• Begin clearing the soil from around the trapped worker's leg immediately. ✅ Determine if there are any active utilities (e.g., gas, electrical) in the collapsed area.
• Administer first aid to the worker for shock and injuries.
• Bring in more equipment to quickly remove the collapsed material.

Correct answer: Determine if there are any active utilities (e.g., gas, electrical) in the collapsed area.

Explanation: After ensuring scene safety and calling for emergency medical services, the absolute next critical step in a trench collapse is to identify and isolate any potential hazards, especially severed utilities like gas lines or electrical cables, which could pose immediate life-threatening risks to both the victim and rescuers. This is mandated by OHS regulations regarding trenching (e.g., Ontario Reg 213/91, Sections 229, 230), and is critical for safe rescue operations.