A contractor is setting up a temporary fuel storage area on a wooded site. A 10,000-litre double-walled fuel tank is being used. What additional environmental control measure, if any, is most appropriate to implement around the entire fuel storage area, even with a double-walled tank?

Question: A contractor is setting up a temporary fuel storage area on a wooded site. A 10,000-litre double-walled fuel tank is being used. What additional environmental control measure, if any, is most appropriate to implement around the entire fuel storage area, even with a double-walled tank?

Answer options: ✅ Install a perimeter berm or ditch downslope from the tank, graded to contain potential spills.

• Implement a regular schedule for manual fuel level checks only.
• Cover the entire area with a gravel base to promote drainage.
• Place a single 'No Smoking' sign within 5 metres of the tank.

Correct answer: Install a perimeter berm or ditch downslope from the tank, graded to contain potential spills.

Explanation: Even with double-walled tanks, a perimeter berm or ditch designed to contain potential spills (e.g., from refueling operations or hose failures) provides a critical layer of environmental protection, especially in sensitive areas, aligning with best management practices for fuel storage as per environmental regulations.