A heavy equipment operator is required to refuel a large bulldozer on a remote job site, approximately 50 meters from a small pond. The refueling will use a mobile fuel tank. According to provincial OHS regulations and best practices, what minimum spill containment capacity is generally required for the portable fuel tank's secondary containment system?

Question: A heavy equipment operator is required to refuel a large bulldozer on a remote job site, approximately 50 meters from a small pond. The refueling will use a mobile fuel tank. According to provincial OHS regulations and best practices, what minimum spill containment capacity is generally required for the portable fuel tank's secondary containment system?

Answer options: ✅ 110% of the volume of the largest single container.

• 50% of the total volume of all containers combined.
• The exact volume of the fuel tank being refueled.
• Any commercially available spill tray sufficient to catch drips.

Correct answer: 110% of the volume of the largest single container.

Explanation: Provincial regulations (e.g., Ontario's Environmental Protection Act and OHS guidance) and best practices for fuel storage typically require secondary containment for portable tanks to hold at least 110% of the volume of the largest single container to account for rain, displacement, and ensure full containment of a catastrophic leak.