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Laboratory Analyses Direct-reading personal monitors are available for only a few specific substances and are rarely sensitive enough to measure the minute [i.e., parts of contaminant per billion parts of air] quantities of contaminants, which may nevertheless, include health changes. Therefore, to detect relatively low-level concentrations of contaminants, long-term or "full-shift" personal air samples must be analyzed in a laboratory. Full-shift air samples are collected by means of a pump, which draws air through a particulate filter. In addition, a major disadvantage of long-term air monitoring is the time required to obtain data. The time lag between sampling and obtaining the analysis results may be a matter of hours, if an onsite laboratory is available, or days or weeks, if a remote laboratory is involved. This can be a significant problem if the situation requires immediate decisions concerning worker safety. Therefore, 2-5 day turnaround will be conducted on all samples collected at the site during this remedial action. Environmental Assessment Cal EPA will be performing air monitoring for site-specific air quality during the Tracy Tire Fire Suppression Project. Air samples will be collected in Tedlar bags or by direct probe analysis. Each air sample will require analysis for Volatile Organic Compounds (VOC's) and Tentatively Identified Compounds (TICs) by field-portable gas chromatography/mass spectrometry (GC/MS). The use of field-portable GC/MS will provide rapid, definitive data for the compounds of interest. Technical Approach FPA will collect and analyze multiple samples by field-portable GUMS. Air samples will be collected through direct on-line analysis or into 1-liter Tedlar bags. Air samples will be analyzed for VOC's (See Table 1). Results will be provided to the project team as they are acquired. SP Environmental Services©November,2000 Page 4 of 7 Sukut Construction,Inc. Air Monitoring Plan-DRAFT Tracy Tire Fire Suppression Project