Final answer:
The initial isolation distances are detailed in the green section of the Emergency Response Guidebook (ERG), used to guide safety measures during hazardous material incidents.
Step-by-step explanation:
The initial isolation distances for specific materials are found in the green section of the Emergency Response Guidebook (ERG). This section provides guidance on initial isolation and protective action distances for incidents involving spills or leaks of hazardous materials. Users would first identify the material involved by using the ID number or the name of the substance from other sections of the ERG, then refer to the green section to determine the necessary precautions to keep the area safe. It's vital for responders to establish these distances promptly to help protect themselves and the public from potential hazards associated with a chemical spill or release.