What kind of materials are USTs typically made from?

Underground storage tanks (USTs) are predominantly constructed from materials like steel and fiberglass due to their durability and resistance to corrosion and chemical reactions. Steel is commonly used because it is strong and provides a robust structure to contain various fluids. However, it is susceptible to corrosion over time, which could lead to leaks. This risk has led to the use of fiberglass, a non-corrosive material, offering a longer lifespan and lower chances of environmental contamination.

Double-walled construction is an added measure that enhances safety, as it provides an additional layer of protection against leaks. This design typically includes an inner tank and an outer wall, allowing for the detection of any leaks that might occur in the inner tank, thus safeguarding the surrounding environment.

The other materials mentioned in the incorrect options, such as wood, aluminum, rubber, concrete, iron, limestone, and PVC, do not offer the same level of reliability or compliance with environmental regulations for UST applications. For instance, wood is not suitable due to its susceptibility to rot and degradation. Concrete can be used in some situations but often does not provide the flexibility and corrosion resistance required. Therefore, the combination of steel, fiberglass, and double-walled construction is the most effective and widely accepted choice for U