A temporary fuel storage tank on a construction site holds 5,000 litres of diesel. According to environmental regulations and good practice, what is the minimum required volume of secondary containment if the tank is not double-walled?

Question: A temporary fuel storage tank on a construction site holds 5,000 litres of diesel. According to environmental regulations and good practice, what is the minimum required volume of secondary containment if the tank is not double-walled?

Answer options: ✅ 5,500 litres (110% of primary tank volume)

• 2,500 litres (50% of primary tank volume)
• 10,000 litres (200% of primary tank volume)
• 5,000 litres (100% of primary tank volume)

Correct answer: 5,500 litres (110% of primary tank volume)

Explanation: Environmental regulations for fuel storage (e.g., under provincial Environmental Protection Acts) often mandate secondary containment for single-walled tanks to be at least 110% of the primary tank's volume, to contain the full volume of a spill plus account for precipitation or displacement.