You are assigned to inspect a storm sewer line accessible through a manhole. The sewer is 4 metres deep and typically contains stagnant water. The work is expected to last approximately 30 minutes. Which critical safety procedure must be followed before entry?

Question: You are assigned to inspect a storm sewer line accessible through a manhole. The sewer is 4 metres deep and typically contains stagnant water. The work is expected to last approximately 30 minutes. Which critical safety procedure must be followed before entry?

Answer options: ✅ Ensure a confined space permit is issued and all conditions are met

• Wear rubber boots and thick work gloves
• Place warning signs around the manhole opening
• Use a self-retracting lifeline attached to a harness

Correct answer: Ensure a confined space permit is issued and all conditions are met

Explanation: Entering a storm sewer via a manhole constitutes confined space entry, which requires a pre-issued permit and adherence to all associated procedures as per CSA Z1006. While other options like PPE and warning signs are important, the permit system ensures a systematic approach to identifying and controlling hazards.