In a vapor dispersion incident, what action may be necessary to manage runoff?

• A. Containment of runoff
• B. Venting to atmosphere
• C. Ignition to burn off vapors
• D. Dilution with water

Answer: (A)

Containment of runoff is essential because any liquid washdown or spilled material can be carried away by rain or surface water, leading to contamination of storm drains, soil, or bodies of water. The best action is to keep the runoff on site using barriers like berms, dikes, or absorbent materials, and then collect the contaminated liquid for proper disposal or treatment. This approach protects the environment while responders work to manage the vapor hazard and prevent further spread.

Venting to the atmosphere releases vapors and increases exposure risk without addressing runoff. Igniting to burn off vapors introduces fire and explosion hazards and changes the problem to a combustion risk rather than environmental contamination. Dilution with water can spread contaminants and overwhelm containment measures, potentially creating more runoff and exposure.