What role does secondary containment play in hazardous waste storage?

• A. It prevents spills from reaching soil or groundwater and reduces environmental contamination risk.
• B. It marks waste as nonhazardous.
• C. It increases hazard potential.
• D. It is optional.

Answer: (A)

Secondary containment provides a barrier around hazardous waste storage containers to catch leaks, drips, or spills. This prevents releases from reaching soil, groundwater, or surface water, which lowers the risk of environmental contamination. In practice, containment might be a lined basin, a diked area, a spill tray under pallets, or a double-walled container—the important part is that it has enough capacity to hold the liquid that could escape from the largest container in the area, giving time to detect and respond to a release. This protective measure supports safety and regulatory compliance, since spills during storage or transfer are a common risk. It’s not about marking waste as nonhazardous, nor is it optional or increasing hazard; it’s about reducing the potential impact of spills.