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PES Environmental, Inc. <br /> APPENDIX C <br /> Explanation of Hazard Evaluation Guidelines <br /> Hazard: Airborne Contaminants <br /> Guideline Explanation <br /> Threshold Limit Value The time-weighted average concentration for <br /> Time-Weighted Average (TLV-TWA) a (TLV-TWA) normal 8-hour work day for <br /> which nearly all workers may be repeatedly <br /> exposed without adverse effect. <br /> Permissible Exposure Limit (PEL) Time-weighted average concentration similar <br /> to (and in many cases derived from) TLV <br /> values. <br /> Immediately Dangerous to Life or Health "IDLH" or "Immediately Dangerous To Life <br /> (IDLH) or Health" means any atmospheric condition <br /> which poses an immediate threat to life, or <br /> which is likely to result in acute or immediate <br /> severe health effects. This includes oxygen <br /> deficiency conditions. <br /> Hazard: Explosion <br /> Guideline Explanation <br /> Lower Explosive Limit (LEL) The minimum concentration of vapor in air <br /> below which the propagation of a flame will <br /> not occur in the presence of an ignition <br /> source. <br /> Upper Explosive Limit (UEL) The maximum concentration of vapor in air <br /> above which propagation of a flame will not <br /> occur in the presence of an ignition source. <br /> Hazard: Fire <br /> Guideline Explanation <br /> Flash Point The lowest temperature at which the vapor of <br /> a combustible liquid can be made to ignite <br /> momentarily in air. <br /> 148400101 H002.doc C-1 <br />