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sep•02-99 01:08P Evan= '3rotthevs Inc. 925 1z3 0229 <br />Gateway Project - Stockton CA Evans Brothers Inc. <br />12. APPENDIX C —7 <br />DEFINITION OF HAZARD EVALUATION GUIDELINES <br />Hazard: Airborne Contaminants <br />Threshold Limit Value <br />Time -Weighted Average <br />(TLV -TWA) <br />Permissible Exposure Limit (PEL) <br />Immediately Dangerous to Lite and <br />Health (IDLH) <br />Lower Explosive Limit (LEL) <br />Upper Explosive Limit (UEL) <br />Explanation <br />The time weighted average concentration <br />for a normal eight hour work day and a <br />forty -hour work week, to which nearly all <br />workers may be repeatedly exposed <br />without adverse effect. <br />Time weighed average concentrations <br />similar to (and in many cases derived from) <br />the Threshold Limit Values. <br />"IDLH" or "Immediately dangerous to life <br />or health" means any atmospheric <br />condition that poses an immediate threat to <br />lire, or that is likely to result in acute or <br />immediate severe health effects. This <br />includes oxygen deficiency conditions_ <br />The minimum concentration of vapor in air <br />below which propagation of a flame will <br />not occur in the presence of an ignition <br />source. <br />Upper Explosive Limit (UEL) The <br />maximum concentration of vapor in air <br />above which propagation of a flame will <br />not occur in the presence of an ignition <br />source. <br />Page 19 of 25 <br />P_22 <br />