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Site Safety and Health Plan UST Removal Project ABF Freight System,Inc. Manteca,California Page 15 be more conservative (e.g., require more monitoring) if deemed necessary by the SSHO or HSM. Under no conditions will the required monitoring frequency decrease. At a minimum, exposures to suspected chemicals of contamination, as defined in this plan, should be monitored prior to and during each task/activity. Additional characterization monitoring will begin immediately if the operation destabilizes the environment changes, or the potential for exposure is otherwise affected. Monitoring should continue on a continuous basis until the operation is stable and the SSHO or HSM feels that the monitoring is sufficient to adequately assess and characterize exposure during that operation. Equipment calibration and use requirements are specified in Sections 5.5 and 5.6. The monitoring equipment specified for each job task is summarized in Table 5-1; monitoring protocols and contaminant action levels are specified in Table 5-2. 5.5 Equipment Calibration Requirements The following summarizes calibration requirements for the equipment specified for at least some of the specified job tasks. See Section 5.4 for task-specific monitoring protocols. Instrument* Calibration Check Frequency • PID Daily CGI Daily * Not all job tasks may require monitoring. See Table 5-2 for specific protocols. 5.6 Monitoring Protocols Task-specific instrument monitoring protocols and contaminant action levels are outlined in Table 5-2. The use of action levels and the basis for the selection of monitoring equipment is as explained below: Action levels determine: (1)the field team's selection of personal protective equipment, and (2) the field team's ability to remain and work within the exclusion(work) zone. The selection of the specified monitoring equipment is based on: (1)the nature of the contaminants; (2)the concentrations of the contaminants; (3) the likelihood of the contaminants entering the air in significant levels; . (4) the probable duration of exposure; and (5)the relative sensitivity of the monitoring equipment to the specific contaminants. \\SERVERI\C-DRIVE\PROJECTS\3272\Plans and Reports\Site Safety Health Plan.doc February 10, 1998