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7.1 Air Monitoring <br /> Initial Monitoring <br /> When the job hazard analyses (JHAs) in Chapter 2 of this HASP are prepared, the <br /> results of monitoring conducted during initial entry are entered. These data do not <br /> indicate airborne concentrations or employee exposures during facility decontamination <br /> activities. Periodic monitoring is conducted to quantify employee exposure during <br /> activities and the JHAs are updated accordingly. <br /> Periodic Monitoring <br /> Periodic monitoring is conducted to evaluate potential worker exposure to airborne <br /> hazardous substances and surface contamination. Resulting data are then used to <br /> determine baseline and on-going airborne and surface concentrations of contaminants, <br /> particularly when employee exposures may change significantly or rapidly. Situations in <br /> which conditions and employee exposures may change significantly or rapidly include: <br /> • commencement of work on another portion of the facility <br /> • exposure to or handling of contaminants/hazards not previously identified <br /> • commencement of a new task/operation <br /> • change in indoor environmental conditions <br /> • commencement of task/operation that is likely to increase airborne <br /> concentrations of hazardous substances <br /> Periodic air monitoring is conducted using direct reading instruments, and by collecting <br /> and analyzing personal samples. Periodic monitoring associated with confined space <br /> entry and spill response is identified in Chapter 11.0 Emergency Response. <br /> Direct reading instruments generally provide less precise data regarding the presence <br /> and concentrations of materials with a specific chemical characteristic. Consequently, <br /> we establish action limits (Table 7-1 b) that can be used by qualified employees to make <br /> quick decisions regarding the adequacy of the PPE worn and other implemented <br /> controls. Any reading in excess of the 10% LEL, will institute a process shut down until <br /> such a time the hazard can be abated or contained. <br /> Table 7-1a summarizes the direct-reading monitoring equipment and monitoring <br /> frequency for each task and facility location. Table 7-1 a also identifies the applicable <br /> action limit to allow appropriate actions when airborne concentrations exceed these <br /> values. Qualified employees, identified in section 7.0, conduct direct-reading <br /> monitoring and interpret data according to the information listed in Table 7-1 a. <br /> Chapter 7 - 2 <br />