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1.. .-.i Only qualified individuals will be authorized to conduct air monitoring at the project sites. These individuals will typically included the Site Safety and Health Officer (SSHO) and/or the CIH. Individuals must be knowledgeable of the limitations and accuracy of the specific monitoring equipment being utilized. Sampling strategies are highly variable depending upon the specific operations being conducted on site. However, the primary objective is to continuously monitor the worker's working environment (i.e. breathing zone), and possible exposure to off site receptors. The DRPs will be used as work zone and breathing zone monitoring devices during intrusive excavation and will be used as general area monitors when intrusive operations are not being performed. The results of the DRI monitoring will be recorded in a logbook and will be used to assess the adequacy of the level of personal protection and hazard management procedures listed in this plan. DRI readings will be compared to the action levels. Upwind and downwind areas of the work zone will be monitored; a wind direction device such as a wind sock or tell-tail will be used to indicate wind direction. If monitoring results indicate that the organic vapor concentrations exceed action levels, appropriate measures will be taken by the Site Safety and Health Officer to ensure worker safety, public health, and regulatory compliance. Such measures may include, but are not limited to, modifications to the level of protection, additional medical monitoring and training, and implementation of further engineering controls. It should be noted that freshly exposed soil and the lack of ventilation in the excavation might exacerbate the airborne concentrations of organic vapors by allowing vapors to concentrate. The Site Safety and Health Officer will take special care to monitor these conditions. 40