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0 0 <br /> 4.0 EXPOSURE MONITORING PLAN <br /> 4.1 Chemical Exposure Evaluation <br /> Hazard exposure monitoring will be implemented to evaluate the potential exposure of <br /> personnel to the chemical and physical hazards anticipated for the project and to assist in <br /> implementing control measures to limit those exposures.The exposure monitoring program <br /> will: <br /> • Assess the potential employee exposure; <br /> • Confirm the appropriateness of the selected level(s) of protection and <br /> indicate changes where necessary; and, <br /> • Verify the effectiveness of engineering controls and work practices. <br /> Potential exposure to the chemicals will be limited by using the following established limits: <br /> PEL - Permissible Exposure Limit <br /> TLV - Threshold Limit Value (ACGIH, Guidance) <br /> TLV - STEL - Short Term Exposure Limit (ACGIH, Guidance) <br /> Time Weighted Averages (TWA) for the Cal-OSHA Permissible Exposure Limits (PELs) <br /> and ACGIH Threshold Limit Values (TLVs) are defined as concentrations for an 8-hour <br /> workday, 40-hour workweek to which almost all workers can be repeatedly exposed without <br /> suffering adverse health effects. <br /> Short Term Exposure Limit(STEL) is defined as the concentration to which workers can be <br /> exposed for short time periods without irritation, tissue damage, or narcosis sufficient to <br /> likely cause impairment of self-rescue or precipitate accidental injury. It is a 15-minute time <br /> weighted average that shall not be exceeded at any time during the workday. Exposures <br /> should not occur more than 4 times per day with at least 60 hours between successive <br /> exposures. <br /> Exposures may occur as a result of the releases of the gases or dust during Site activities. <br /> Exposures may occur through inhalation of vapors and through direct skin or eye contact <br /> with vapors or dust. Dust monitoring is not necessary for the tasks associated with the <br /> project scope. However, if significant dust emissions are anticipated, the dust/ particulate <br /> monitoring procedures described in the following sections will be followed. The exposure <br /> monitoring program is based on previous Site characterizations and will be modified, if <br /> necessary, during the course of this project. <br /> 4.1.1 Work Area Monitoring <br /> Potential work area monitoring will be conducted using direct-reading instruments to <br /> ENVA010 <br /> February 2005 <br /> A M E R I C A P:\PG&E\PGE-05-01 Stockton MW26R Investigation\MW26 Work Plan\H&S\H&5 Plan-2005.doc <br />