What does "secondary containment" refer to in HAZMAT operations?

In HAZMAT operations, "secondary containment" specifically refers to an additional layer of protection designed to prevent hazardous materials from escaping into the environment in the event of a primary containment failure. This concept is critical in preventing spills and leaks from containers that hold hazardous substances, thus safeguarding the surrounding area, including soil, groundwater, and air.

Secondary containment systems can involve various structures or methods, such as secondary containment walls, berms, or double-walled tanks. These systems act as a fail-safe mechanism, containing any potential leaks that could occur, thereby minimizing environmental impact and health risks.

This understanding emphasizes the importance of risk mitigation when dealing with hazardous materials and the regulatory requirements that dictate proper containment practices. The other options do not align with the definition and purpose of secondary containment: they address different aspects of hazardous materials management but do not fulfill the role that secondary containment plays in overall safety protocols.