Which reference should responders consult first to determine protective action zones?

The Emergency Response Guidebook (ERG) is specifically designed to assist first responders in the initial phase of a hazardous material incident. It provides crucial information on identifying hazardous substances, assessing risks, and determining protective action zones.

When dealing with hazardous materials, the ERG outlines guidelines for evacuation distances and protective actions based on the type of substance involved, making it an essential resource for responders. This guide helps them make informed decisions quickly, which is vital in emergency situations where time is of the essence.

Other resources like the incident command manual, material safety data sheets, and company policies may contain valuable information but are not primarily focused on immediate protective actions and zones in the context of hazardous materials. The incident command manual is more centered on overall incident management rather than specifics on hazardous substance containment. Material safety data sheets contain details about specific chemicals but do not provide a comprehensive overview of protective action zones. Company policies may vary widely and are typically tailored to the organization rather than standardized for emergency response. Therefore, the ERG is the most pertinent reference for quickly assessing protective actions during a HAZMAT incident.