Which phase of WUI operations occurs after the impingement phase?

• A. Post-Impingement
• B. Pre-impingement
• C. Impingement
• D. During Incident

Answer: (A)

The sequence here follows how the fire front interacts with structures in Wildland-Urban Interface operations. After the fire front has impinged on a structure or defensive area, the next phase focuses on finishing the immediate suppression work and securing the scene. This is the post-impingement phase, where crews perform mop-up, overhaul, salvage, and monitor for hotspots, plus assess damage and prepare for transition or demobilization. Pre-impingement happens before the fire reaches the structure, and impingement is the active contact event itself. “During Incident” isn’t a defined phase in this sequence, so it doesn’t fit as what comes after impingement.