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The risk analysis provides an estimation of: <br />the likelihood (probability) of an accidental <br />release based on the history of current <br />conditions and controls at the facility, <br />consideration of any unusual <br />environmental conditions, or the <br />possibility of simultaneous emergency <br />incidents; <br />severity of consequences of human injury <br />that may occur, the number of possible <br />injuries and deaths, and the associated <br />high-risk groups; <br />severity of consequences on critical <br />facilities <br />severity of consequences of damage to <br />property; and <br />severity of consequences of damage to <br />environment. <br />The hazards analysis for each of the facilities that have been <br />determined to pose the most significant threat to public health <br />and safety is included in Appendix B. <br />1.4 ASSUMPTIONS <br />Extremely hazardous substances present in quantities above theirthreshold <br />planning quantities will be identified for the Local Emergency Planning <br />Committee by the reporting facilities. <br />Estimates of vulnerable zones are based upon the following credible "worst <br />case" assumptions: <br />Quantity released: maximum quantity that could be released <br />from largest vessel or inter -connected vessels. <br />Indian River County Emergency Plan for Hazardous Materials Page 5 <br />