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40 <br />i <br />40 <br />using one-tenth of the "Immediately Dangerous to Life Health" (IDLH) <br />level published by the National Institute for Occupational Safety and <br />Health (NIOSH), or one-tenth of an approximation of the IDLH from <br />animal toxicity data. <br />10.4 EVACUATION <br />Authority to issue an immediate evacuation order for any vulnerable zone <br />is delegated to the Senior Incident Commander (on -scene) within a given <br />jurisdiction if the health and safety of persons within the critical <br />evacuation area is in imminent danger. Evacuation of all or any part (i.e., <br />downwind) of a vulnerable zone will be by geographic boundaries. <br />Persons residing in a vulnerable zone which is ordered to be evacuated <br />will be instructed to evacuate according to the evacuation plan outlined <br />in Section 10.4.1. <br />All evacuation routes will lead citizens toward registration centers. Once <br />at the centers, citizens will be screened for conditions requiring <br />immediate medical attention, transported to medical facilities if <br />necessary, and assigned to a shelter. <br />Strict traffic control measures will be utilized to permit ingress and egress <br />of ambulances, firelrescue, and other emergency vehicles and equipment. <br />County and municipal law enforcement personnel will control traffic along <br />evacuation routes. Law enforcement personnel will block state roads as <br />needed to prevent unauthorized use. Periodic patrols of the evacuation <br />routes by law enforcement personnel will be used to maintain order, <br />assist disabled evacuees and report route impediments to the County <br />EOC. <br />All roadways along evacuation routes are surfaced. The only <br />impediments to travel would be weather conditions and traffic <br />congestion. <br />Hurricane high winds and tides would prevent evacuation along north and <br />southbound coastal roads; however, for this event the wind speed would <br />be in excess of 74 miles per hour and a plume requiring evacuation would <br />be improbable. Traffic control points and barricades will be used to <br />expedite the flow of traffic. All routes will be monitored by police <br />officers and the Florida Highway Patrol. Should breakdowns occur, <br />wreckers will be dispatched to the scene. <br />Indian River County Emergency Plan for Hazardous Materials Pages 118 <br />