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Employee Exposure Assessment SPIES developed an air monitoring strategy, which included the collection of personal air samples. Prior to collection, and in keeping with good standards of industrial hygiene practice, the laboratory was consulted as to the best sampling methods for detecting the suspected contaminants. The sampling strategy was conducted in accordance with the collection criteria outlined in the NIOSH [National Institute of Occupational Safety and Health] and OSHA [Occupational Safety and Health Administration] Methodologies. This section details the sampling strategy, methodologies and analyses that will be used to monitor the following contaminants and document their levels in the exclusion zones. [Refer to Table 1 for details]. The selective monitoring of high-risk workers [i.e., heavy equipment operators, firefighters, suppression officer, etc. approximating contaminated burn areas] will be conducted. This approach is based on the rationale that the probability of significant exposure varies directly with distance from the source. If workers closest to the source are not significantly exposed, than all other workers are, presumably, also not significantly exposed and therefore do not require daily monitoring. Since occupational exposures are linked closely with active material handling, personal air sampling should not be necessary until site mitigation has begun. Personal monitoring samples will be collected in the breathing zone [placed on the worker's lapel]. These samples represent the actual inhalation exposure of workers who are not wearing respiratory protection and the potential exposure of workers who are wearing respirators. Personal sampling pumps [i.e., SKC brand] that automatically maintain a constant flow rate to collect samples will be utilized. Immediately before sampling, the ends of the sampling media were uncapped and tygon tubing was connected to the backup end so that air could be drawn through the sampling train with a pre-calibrated, battery operated pump. The samples are collected at a particular flow rate, so as to collect the desired volume of air to comply with analytical methodologies and then sent to an accredited laboratory for analyses. In addition, pumps will be protected with disposable coverings to make decontamination procedures easier. SP Environmental Services©November, 2000 Page 2 of 7 Sukut Construction, Inc. Air Monitoring Plan-DRAFT Tracy Tire Fire Suppression Project