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C.� V <br /> DEFINITION OF HAZARD EVALUATION GUIDELINES <br /> Hazard: Airborne Contaminants, <br /> { <br /> Guideline Explanation <br /> Threshold Limit Value The time-weighted average concentration fora <br /> Time-Weighted Average normal 8-hour week day and a 40-hour world <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 <br /> immediate threat to life, or which is likely to result in <br /> acute or immediate severe health effects. This'includes <br /> oxygen 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 in the air above <br /> which propagation of a flame will not occur in the <br /> presence of an ignition source. <br /> Hazard: Fire <br /> i <br /> Guideline Explanation <br /> Flash Point (flash p) The lowest temperature at which the vapor of a <br /> combustible liquid can be made to ignite momentarily <br /> in air. <br /> Avalon Environmental Consultants 9627-001-6 <br /> Kashmar Singh Joes Truck Plaza <br /> January 9,2001 Lathrop,'Cal ifom is <br />