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i • measure and monitor possible airborne exposures. A Photo-Ionization Detector(PID)and, if deemed necessary, a Mini-Ram Airborne Particulate Monitor,will be used to monitor total volatile organic compounds and dust in the air, respectively. The meters will be calibrated priorto the beginning of each work shift in accordance to the manufacturer's requirements. Table 1 correlates the potential hazards, their monitoring requirements, and action levels associated with work zone monitoring. Photo-Ionization Detector: The Mini-Rae 2000 (or equivalent)will be used to monitor total volatile organic compounds in the air. Mini-Ram Airborne Particulate Monitor: The Mini-Ram measures the concentration of airborne particles, both solid and liquid. The display will indicate the particulate level in the units of milligrams per cubic meter(mg/m3). The unit will be calibrated in the field on a daily basis following the manufacturer's operating directions. 4.1.2 Dust Control Dust control will be performed. Every reasonable precaution will be taken to minimize emissions during all field activities. If dust suppression is utilized for contaminant control, it will be performed by lightly spraying or misting areas with water prior to disturbing Site soils. The use of water will be carefully monitored. Water usage shall not result in creating mud, ponding water or runoff. 4.2 Noise Monitoring and Prevention ENV America employees will wear ear plugs or other hearing protection if a task that involves the use of a power tool or equipment is conducted at the Site. A portable hand held Type II Sound Level Meter(SLM) may be used for surveying general work areas, if necessary. All noise measurements will be taken in the"Hearing Zone"of the individual being monitored (i.e., within a radius not to exceed 12 inches from the ear closest or in most direct proximity to the noise source). All measurements used for comparison with compliance noise levels will be made on the A-weighted scale. When noise monitoring data shows levels equivalent to 85 dBA or a higher TWA for an 8- hourwork shift, hearing protection will be required in accordance with the OSHA standard for occupational noise exposure, 29 CFR 1910.95. "Hearing Protection Required" areas may be designated by the Site Manager where noise levels may exceed the 85 dBA TWA action level, or in areas where work has commenced but monitoring has not been conducted and noise levels may be expected to exceed the 85 dBA TWA action level. Designated employees, whose job assignments require them to be in the vicinity of high noise levels, will not remain in the area when not required. ENV.., 11 February 2005 A M E R I C A P:\PG&E\PGE-05-01 Stockton MW26R Investigation\MW26 Work Plan\H&S\H&S Plan-2005.doc