What common materials are used for underground fuel tanks?

The choice of fiberglass and coated steel as common materials for underground fuel tanks stems from their durability, resistance to corrosion, and safety features. Fiberglass is lightweight, non-corrosive, and can withstand the harsh conditions that underground tanks are often exposed to, such as moisture and soil acidity. Coated steel provides a robust structure that can handle high pressures and is treated to prevent rust and corrosion, which is critical for the longevity and safety of the tanks. The combination of these materials helps minimize the risk of leaks and environmental contamination, making them ideal for storing fuel underground.

In contrast, other materials mentioned are less suitable for various reasons. Wood and concrete, while sturdy, are not ideal due to wood's susceptibility to rot and concrete's potential for cracking and leaking over time. Plastic is an alternative that may be used, but aluminum is typically not chosen for underground applications because it can corrode when buried in soil. Cardboard is entirely unsuitable as it would disintegrate quickly in an underground environment and fail to provide the necessary containment for fuel.