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.. e' 'airrH^ -- �.K'" �rt - " -ie�i, "` ... r.ems;se"Vf- ` .�,..-"-. •T- <br /> ksu &�". y �L' �. s� h Mid TwP r y `� •9 <br /> { k <br /> ��Y. � r-�� <br /> ,x- � ,Y-..- :.... .- �y �,.{"�__.., �.hRrr.,..;.r ..€�y" � .a"�. :''i+=° .v"��—'c•`'-n _��'."�'""'".4 '�.� -�?*t <br /> I <br /> �. APPENDIX C <br /> EXPLANATION OF HAZARD EVALUATION GUIDELINES <br /> Guideline EXP1an i on <br /> Hazard: Airborne Contaminants <br /> Threshold Li,nit Value The time-weighted average con- <br /> Time-Weighted Average centration for a normal 8-hour <br /> (TLV-TWA) work day and a 40-hour work <br /> week, to which nearly all <br /> workers may be repeatedly <br /> exposed without adverse <br /> effect. <br /> K Permissible Exposure Limit <br /> (PEL) p Time-weighted average concert <br /> trations similar to (and in <br /> many cases derived from) the <br /> threshold limit values. <br /> prmediately Dangerous The maximum level from which a <br /> to Life or Health (IDLH) worker could escape without <br /> a any escape-impairing systems <br /> or any irreversible health <br /> effects. <br /> i <br /> Hazard: Explosion <br /> Lower Explosive Limit 'She minimum concentration of <br /> (LEL) vapor in air below which <br /> propagation of a flame will <br /> not occur in the presence of <br /> an ignition source. <br /> Upper Explosive Limit The maximum concentration of <br /> (UEL) vapor in air above which <br /> '^ propagation of a flame will <br /> not occur in the presence of <br /> 3 ' an ignition source. <br /> hazard: Fire <br /> ! ' Flash Point The lowest temperature at <br /> (flash p) which the vapor of a com- <br /> bustible liquid can be made to <br /> ignite momentarily in air. <br /> +U 3 <br /> I loin <br /> y.r <br /> l��ti <br />