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TABLE 1 <br /> DEFINITION OF HAZARD EVALUATION GUIDELINES <br /> HAZARD: Airborne Contaminants <br /> Gu i del i ne Explanation <br /> Threshold Limit Value The time-weighted average <br /> Time-Weighted Average concentration for a normal 8-hour <br /> work <br /> (TLV-TWA) day and a 40-hour work week, to <br /> which nearly all workers may be <br /> repeatedly exposed without adverse <br /> effect. <br /> Permissible Exposure Limit Time-weighted average <br /> concentrations <br /> (PEL) similar to (and in many cases <br /> derived from) the Threshold Limit <br /> Values> <br /> Immediately Dangerous to "IDLH" or "immediately dangerous <br /> to <br /> Life and Health life or health" means any <br /> atmospheric <br /> (IDLH) condition that poses an immediate <br /> threat to life, or which is likely to <br /> result in acute or immediate severe <br /> health effects. This includes <br /> oxygen deficiency conditions. <br /> HAZARD: Explosion <br /> Guideline Explanation <br /> Lower Explosive Limit The minimum concentration of <br /> vapor in <br /> (LEL) air below which propagation of a <br /> flame will not occur in the presence <br /> of an ignition source. <br /> Upper Explosive Limit The maximum concentration of <br /> vapor in(UEL)air above which <br /> propagation of a flame will not <br />