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October 16, 1995 UEC Document No.: R -1659510A UEC Job No.: 165040-9510C instruction to the cleanup crew in a timely fashion. UEC proposes to collect three (3) work activity air samples during each work shift from the approximate locations identified in Figure 1. Once the site has been deemed free of asbestos containing soil, UEC staff will collect area air clearance samples in order to document the condition of the atmosphere surrounding the site upon abatement crew exodus from the site. As with all of the other area air samples collected during this project, these analytical results will be included on the airborne fiber concentration timeline. The final clearance air sample results are an important part of the airborne fiber concentration profile, just as soil samples used to confirm the condition of the soil after cleanup activities have ceased, are typically an important part of deeming a site suitable for closure. UEC proposes to collect three (3) final clearance air samples from the approximate locations identified in Figure 1. 3.2 Exposure Air Sample Collection 3.2.1 Exposure Air Sample Collection Protocol The following guidelines, paraphrasing Title 8 CCR 1529, Subsection (d) and Appendix A, will be adhered to during exposure air sample collection: Determinations of employee exposures to asbestos will be based on one or more personal breathing zone air samples which represent 8 -hour time -weighted average exposures and 30 - minute short-term exposures for a representative sample of employees in work areas, job classifications, or operations which are expected to be associated with exposures to asbestos at or above the PEL and/or the excursion limit. 2. Work areas which are expected to be associated with exposures to asbestos at or above the PEL and/or the excursion will be monitored on all cleanup activity dates. Air sample results will be made available to the abatement contractor, in order to satisfy the required employee notification and if necessary, to implement engineering controls to reduce employee exposure below the PEL and /or excursion limit. 3. Personal samples will be taken in the "breathing zone" of the employee (i.e., attached to or near the collar or lapel near the worker's face). 4. The collection device used will be a 25 -mm diameter cassette with an open-faced 50 -mm electrically conductive extension cowl. An air flow rate between 0.5 and 2.5 liters/minute will be selected for the 25 -mm cassette. Where possible, a sufficient air volume for each air sample will be collected to yield between 100 and 1,300 fibers per square millimeter on the membrane filter. If the filter appears darkened or if loose dust is seen on the filter, a new sample will be initiated. 5. Samples will be hand delivered to the laboratory in a rigid container, each sample individually contained within a sealed plastic bag. Sufficient care will be taken to minimize dislodging of the collected fibers. 8