'UST Designated Operator A Certification Practice Test 2025 – All-in-One Guide to Master Your Certification!'

USTs storing hazardous substances such as fuels and chemicals are typically required to have secondary containment due to the potential risks they pose to the environment and public health. Secondary containment systems are designed to prevent leaks or spills from the primary tank from reaching the surrounding environment. This is crucial for tanks that store hazardous materials, as any release could lead to significant contamination of soil and groundwater, endangering ecosystems and human health.

Regulations in various jurisdictions mandate secondary containment for USTs containing substances that are hazardous to ensure that any leaks are contained and managed effectively. Secondary containment can include features such as double-walled tanks, installation of liners, or use of containment structures designed to capture any leaks.

This requirement underscores the importance of robust safety measures for USTs dealing with more hazardous materials compared to those storing non-hazardous or less dangerous substances. The other types of USTs listed may not have the same level of regulatory scrutiny when it comes to secondary containment, as they do not present the same environmental risks.