What is the definition of secondary containment in fuel tank regulations?

Secondary containment refers to a system designed specifically to catch and manage leaks or spills that may occur from a primary tank. This containment typically involves a secondary layer around the primary tank, such as a built-in wall or basin, that functions to prevent the release of hazardous substances into the environment. This is particularly important in fuel tank regulations, as it minimizes the risk of soil and water contamination in case of an accidental release.

The implementation of secondary containment systems is a crucial regulatory requirement to ensure safety and environmental protection, addressing potential risks associated with fuel storage. Through this approach, any leaks or spills can be contained effectively without posing a danger to the surrounding ecosystem or human health.

This concept is distinct from the other options mentioned, which focus on different aspects of fuel management and safety.