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