In the context of containment, which element may require containment during vapor dispersion?

• A. Runoff
• B. Vapor plume
• C. Water runoff
• D. Wind direction

Answer: (A)

During containment planning for hazardous-material releases, you must consider all pathways contaminants can take. Vapors spread through the air, but liquids associated with the release can still move as runoff. If condensation, precipitation, or spills create contaminated liquid, it can flow across surfaces and toward drains, soils, or waterways. That runoff becomes a secondary exposure route and environmental hazard, so it needs to be contained with barriers, berms, capture basins, and proper drainage control.

While the vapor plume and wind direction influence where the gas travels, containment specifically addresses preventing the liquid from migrating. Hence, runoff may require containment during vapor dispersion.