Containment Strategy

What Is Containment Strategy?

A containment strategy is the tactical decision on how to stop a hazardous material from spreading further, chosen from a small set of standard techniques: diking/damming (building an earthen or absorbent berm to pool a liquid), diversion (redirecting flow away from a drain, waterway, or sensitive area using a trench or barrier), retention (using an existing low point or containment structure to collect product), vapor suppression (foam blanket or water spray to knock down vapor from a volatile liquid), and plugging/patching (physically stopping a leak at its source, only attempted when the hazard and container type make it safe to approach). Which technique applies depends heavily on the release type: a flowing liquid spill calls for diking or diversion, a vapor cloud calls for suppression, and a pressurized leak from a container calls for a plug/patch decision that weighs the risk of approaching the source against the risk of letting it continue.

Why Containment Strategy Matters on the Fireground

Picking diversion when diking was the right call, or vice versa, can send product toward a storm drain or waterway instead of away from it. The technique has to match the release type and terrain in front of the team, not just default to whichever method was used on the last call, since a strategy chosen for the wrong scenario can actively worsen the spread instead of stopping it.

Relevant NFPA Standards

• NFPA 470: Hazardous Materials/Weapons of Mass Destruction (WMD) Standard for Responders
• OSHA 29 CFR 1910.120: Hazardous Waste Operations and Emergency Response (HAZWOPER)

Field Procedures & Tactical Steps

1. Identify the release type (flowing liquid, pooling liquid, vapor, or pressurized leak) before selecting a containment technique.
2. Assess terrain and existing drainage paths to choose between diking, diversion, or retention for a liquid spill.
3. Apply vapor suppression (foam or water spray) for volatile liquids releasing hazardous vapor, monitoring concentration as it's applied.
4. Reserve plugging or patching for situations where the hazard, container type, and PPE allow safe approach to the source, and confirm patch material compatibility first.

Common Context & Application

Decided during the size-up phase of a liquid or vapor release, when the hazmat group has to choose between diking, diversion, retention, or vapor suppression based on the terrain, release type, and available time before product reaches a drain or waterway.

Frequently Asked Questions about Containment Strategy