What standards should underground storage tanks meet?

The correct answer emphasizes that underground storage tanks (USTs) should be constructed of double-walled materials such as fiberglass-reinforced plastics or steel with protective coatings. This design is crucial for environmental safety, as the double-walled construction provides an additional layer of security against leaks and spills. The outer wall acts as a barrier, containing any potential leakage from the inner tank, thereby preventing contamination of the surrounding soil and groundwater.

Moreover, the use of fiberglass and protective coatings enhances durability and resistance to corrosion, which is vital for the long-term reliability of USTs that store hazardous materials. These materials are designed to withstand the chemical reactions and conditions they may be exposed to underground, helping to mitigate environmental risks.

In contrast, single-walled steel tanks lack these safety features, making them more susceptible to corrosion and failure. Heavy-duty plastics may not have the same structural integrity or chemical resistance, while concrete tanks may not be suitable for all types of substances and can experience cracking over time. Therefore, the construction of USTs according to stringent standards reflects the necessity for ensuring public safety and environmental protection.