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5.4 Monitoring Equipment Requirements Monitoring is to be conducted by the Site Safety Officer or his/her designee. The results shall be interpreted by the Site Safety Officer together with the Regional Environmental Health and Safety Manager (REHSM). Monitoring results and calibration logs (Attachments 5 and 6) are to be completed and reviewed by the Project Manager,with a copy and original filed with the Site Safety and Health Plan. Monitoring is designed to assess exposure to employees during site activities and to determine if Personal Protective Equipment (PPE) is required and/or adequate to assure protection. Because investigation and remediation activities at hazardous waste sites are of an inconsistent nature, it is not possible to assign a practicing monitoring protocol which excludes or is not directly dependent upon professional judgement to determine when monitoring is required to assess exposure. Thus, the following generic protocol must be followed at a minimum and should be modified to be more conservative (e.g. require more monitoring) if deemed necessary by the Site Security Officer (SSO) or Regional Environmental Health and Safety Manager (REHSM). 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 shall 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 SSO or REHSM 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. Calibration Check Instrument' Frequency Direct Reading Instruments Beginning of workday PID (Formal calibration at least once per month) 20