During initial isolation, what distance is recommended for a solid hazard?

• A. 100
• B. 330
• C. 150
• D. 75

Answer: (D)

Initial isolation is about quickly creating a safe exclusion zone around the incident to protect people while you assess and respond. The form of the released material governs how far the hazard could travel early on. Solids can generate dust that becomes airborne, irritates or inhales, and can create secondary ignition or contamination risks if a dust cloud forms or material shifts with wind or terrain. Because of these possibilities, the recommended starting distance for a solid hazard is 75 feet. This provides enough buffer to protect responders while you set up and evaluate the scene, without over-extending resources. Larger distances are generally reserved for vapors or liquids that can travel farther in air, whereas smaller or different distances apply to other types of releases.