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- <br /> S <br /> Y <br /> DEFINITION OF HAZARD EVALUATION GUIDELINES <br /> Hazard: Airborne Contaminants <br /> Guideline Explanation <br /> Threshold Limit Value The average time-weighted a concentration for a <br /> g g <br /> Time-Weighted Average normal 8-hour week day and a 40-hour work <br /> (TLV-TWA) week, to which nearly all workers may be repeatedly <br /> exposed without adverse effect. <br /> Permissible Exposure Limit Time-weighted average concentrations similar to <br /> (PEL) (and in many cases derived from) the Threshold Limit <br /> Values. <br /> Immediately Dangerous to Life "IDLH" or "Immediately dangerous to life or health" <br /> and Health (IDLH) means any atmospheric condition that poses an immediate <br />' threat to life, or which is likely to result in acute or <br /> immediate severe health effects. This includes oxygen <br /> deficiency conditions. <br /> Hazard: Explosion <br />' Guideline Explanation <br />' Lower Explosive Limit The minimum concentration of(LEL) vapor in air below <br /> which propagation of a flame will not occur in the <br /> presence of an ignition source. <br />' Upper Explosive Limit (UEL) The maximum concentration of vapor i <br /> po n the air above <br /> which propagation of a flame will not occur in the <br />' presence of an ignition source. <br />' Hazard: Fire <br /> Guideline Explanation <br />' Flash Point (flash ) The lowest temperature <br /> P at which the vapor of a <br /> combustible liquid can be made to ignite momentarily in <br />' air. <br />,r <br /> CRC Environmental Risk Management,Inc. Project#2100-250-2 <br /> American Savings Bank 222 North El Dorado Street <br />' April 6, 1995 Stockton, California <br />