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LLNL Emergency Plan Rev-23 October 2017 85 Reentry by First Responders to specific buildings or areas during an emergency must be approved by the on-scene IC (either the Fire Department Battalion Chief or PFD Security IC for security events), with the assessment that the facility be reentered safely. 8.4 Emergency Planning Zones The EPZ for hazardous material accidents are described and analyzed in the individual facility EPHAs. In general, an EPZ is an area within which the results of an EPHA indicate the need for specific planning to protect people from the consequences of hazardous material releases. For Site 200, it was determined that a one-mile composite EPZ was appropriate based upon a summary of the EPZs for individual facilities. The EPZ for Site 300 is the site boundary itself. No offsite area can be affected by emergencies at Site 300. The primary exposure pathway from hazards at both sites is inhalation, although ingestion and absorption potential is also considered in EPHAs. The development and identification of this composite EPZ may be found in the Composite Emergency Planning Zone. Figure 8.1 depicts the EPZ developed for Site 200 and shows onsite and offsite areas that could be affected by emergencies at Site 200. Protection of offsite residents in the EPZ is the responsibility of the IC; however, it is the duty of the ED to issue protective action recommendations to the IC, as well as to offsite authorities. Based on agreements with offsite agencies, offsite evacuation and sheltering plans to be used in an emergency are not pre-defined, but will be determined by the IC during the emergency. The IC may evacuate residents beyond the EPZ to simplify the logistics of moving residents.