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DEFINITION OF HAZARD EVALUATION GUIDELINES <br /> H zard: Airborne Contamin <br /> Guideline Explanation <br /> Threshold Limit Value The time-weighted average concentration for a <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 /> (PE L) (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 /> Haz!ard: Fire <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 9627-001-2 <br /> Kashmar Singh Joes Truck Stop <br /> October 20, 1998 Lathrop,California <br />