Which of the following is an example of secondary containment?

• A. Primary drum
• B. Berm, dike, or secondary tray beneath drums
• C. Ventilation hood
• D. Absorbent pads only

Answer: (B)

Secondary containment is a barrier or system that catches leaks from the primary container so spills don’t reach the floor or environment. A berm, dike, or secondary tray beneath drums provides that extra layer of protection by capturing any leaking liquid. If a drum leaks or overflows, the liquid is contained in the berm or tray, making it easier to respond and clean up without spreading.

A primary drum is the container that holds the material itself, not a containment system. A ventilation hood is for air flow and venting, not preventing spills. Absorbent pads are helpful for cleanup after a spill but don’t prevent the spill from occurring, so they’re not containment.