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5.0 JOB HAZARD ANALYSIS <br /> 5 1 CHEMICAL HAZARDS <br /> There are two categories of chemical hazards associated with site activities <br /> • Site Constituents <br /> • Chemicals used to conduct the site work <br /> Site constituents are those which exist at the site and are the cause for conducting site <br /> activities The chemicals that are brought on site in order to conduct the work may be <br /> hazardous and subject to regulation under OSHA's Hazard Communication Standard (8 <br /> CCR 5194) <br /> 5 1 1 Site Constituents <br /> From an occupational health standpoint, given that any potential exposure to site <br /> personnel will be only for a short period of time (intermittent for several days), <br /> the levels of contaminants that have been, or could be, encountered during site <br /> ' activities should not represent a sigmficant concern if the provisions of this HSP <br /> are appropriately implemented However, the site is still under investigation, so <br /> M the potential for exposure to elevated levels of these contaminants may exist <br /> Overviews of the hazards associated with exposure to elevated levels of these <br /> contaminants may exist Overviews of the hazards associated with exposure to <br /> the chemicals that may pose a hazard during site activities are presented below in <br /> terms of the following types of occupational exposure limits <br /> PEL - Permissible Exposure Limit (OSHA Standard) <br /> TLV - Threshold Limit Value (ACGIH Guidance) <br /> REL - Recommended Exposure Limit (NIOSH Guidance) <br /> ' STEL- Short Term Exposure Limit <br /> C - Ceiling <br /> OSHA Permissible Exposure Limits (PELs), ACGIH Threshold Limit Values <br /> (TLVs), and NIOSH Recommended Exposure Limits (RELs) are time-weighted <br /> averages (TWAs) defined as concentrations for a normal 8-hour work day and <br /> 40-hour work week to which almost all workers can be repeatedly exposed <br /> without suffering adverse health effects <br /> ' Short Term Exposure Limit (STEL) is defined as the concentration to which <br /> workers can be exposed for short time periods without irritation, tissue damage, <br /> or narcosis sufficient to likely cause impairment of self-rescue or precipitate <br /> accidental injury The STEL is a 15-minute time-weighted average that should <br /> not be exceeded at any time during the workday STELs are used by OSHA, <br /> ACGIH and NIOSH for chemical exposure criteria <br /> AMFOREST 21 7 12 <br />