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i <br />4W <br />The risk analysis provides an estimation of: <br />- the likelihood (probability) of an <br />accidental release based on the history <br />of current conditions and controls at the <br />facility, consideration of any unusual <br />environmental conditions, or the <br />possibility of simultaneous emergency <br />incidents; <br />- severity of consequences of human <br />injury that may occur, the number of <br />possible injuries and deaths, and the <br />associated 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 <br />have been determined to pose the most significant <br />threat to public health and safety is included in <br />Appendix B. <br />1.4 ASSUMPTIONS <br />Extremely hazardous substances present in quantities above their <br />threshold planning quantities will be identified for the Local Emergency <br />Planning Committee by the reporting facilities. <br />Estimates of vulnerable zones are based upon the following credible <br />"'worst case" assumptions: <br />- Quantity released: maximum quantity that could be <br />released from largest vessel or inter -connected vessels. <br />Indian River County Emergency (Plan for Hazardous Materials Page 5 <br />