Plumber Red Seal · Question
A plumber is inspecting a trench that has been open for several days after a heavy rainfall. The trench is 2.5 metres deep. What is the most critical safety concern they should assess before allowing work to resume in the trench?
After heavy rainfall, the stability of trench walls is significantly compromised due to water saturation, making collapse the most critical and immediate hazard
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Question: A plumber is inspecting a trench that has been open for several days after a heavy rainfall. The trench is 2.5 metres deep. What is the most critical safety concern they should assess before allowing work to resume in the trench?
Answer options:
- The presence of standing water at the bottom of the trench ✅ The stability of the trench walls for signs of sloughing or collapse
- The location of underground utilities not previously marked
- The availability of ladders for safe access and egress
Correct answer: The stability of the trench walls for signs of sloughing or collapse
Explanation: After heavy rainfall, the stability of trench walls is significantly compromised due to water saturation, making collapse the most critical and immediate hazard. While the other options are valid safety concerns, trench wall stability directly impacts the immediate danger of being buried.
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