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10.3 LEVELS OF CONCERN A Level of Concern (LOC) is the concentration of an EHS in the air above which there may be serious irreversible health effects or death as a result of a single exposure for a relatively short period of time. There is no precise measure of an LOC for the chemicals listed as EHSs. The surrogate or estimated LOC's being used for each EHS are found in Appendix A. For the purpose of this plan, an LOC has been estimated by using one-tenth of the "Immediately Dangerous to Life Health" (IDLH) level published by the National Institute for Occupational Safety and Health (NIOSH), or one-tenth of an approximation of the IDLH from animal toxicity data. 10.4 EVACUATION Authority to issue an immediate evacuation order for any vulnerable zone is delegated to the Senior Incident Commander (on -scene) within a given jurisdiction if the health and safety of persons within the critical evacuation area is in imminent danger. Evacuation of all or any part (i.e., downwind) of a vulnerable zone will be by geographic boundaries. Persons residing in a vulnerable zone which is ordered to be evacuated will be instructed to evacuate according to the evacuation plan outlined in Section 10.4.1. All evacuation routes will lead citizens toward registration centers. Once at the centers, citizens will be screened for conditions requiring immediate medical attention, transported to medical facilities if necessary, and assigned to a shelter. Strict traffic control measures will be utilized to permit ingress and egress of ambulances, fire/rescue, and other emergency vehicles and equipment. County and municipal law enforcement personnel will control traffic along evacuation routes. Law enforcement personnel will block state roads as needed to prevent unauthorized use. Periodic patrols of the evacuation routes by law enforcement personnel will be used to maintain order, assist disabled evacuees and report route impediments to the County EOC. All roadways along evacuation routes are surfaced. The only impediments to travel would be weather conditions and traffic congestion. Hurricane high winds and tides would prevent evacuation along north and southbound coastal roads; however, for this event the wind speed would be in excess of 74 miles per hour and a plume requiring evacuation would be improbable. Traffic control points and barricades will be used to expedite the flow of traffic. All routes will be monitored by police officers Indian River County Emergency Plan for Hazardous Materials Page 69