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PO geological Teckxics i/W. Page 9 Interim Remedial Action Plan Project No.723.2 March 7,2005 Vapor samples will be collected in one-liter capacity Tedlar bags and submitted to a state certified laboratory for BTEX and TPH-G analysis by method TO-3. The reporting limits are listed below. Reporting Limits: BTEX TPH-G Air ( /1) 0.0032 0.1 A chain of custody document, listing all samples collected and their intended analyses, will accompany the samples from the field to the laboratory, thereby providing a means to track the movement of the samples and ensure their integrity. 3.1.3.2 Water Monitoring/Sampling Procedure The extraction wells will be sampled at the well head using disposable bailers so that individual well concentrations can be measured. Water samples will also be obtained from the dual phase treatment system holding tank effluent (influent to air stripper) and air stripper effluent on a monthly basis (or more often as discharge permit requires). Water samples will be collected into 40-m1 VOA vials, preserved with hydrochloric acid, while minimizing sample aeration during transfer of the sample. All samples will be checked for headspace bubbles, labeled, inserted into foam holders and placed into a cooled ice chest for transport to a state certified laboratory. The sampling technician will wear disposable gloves while collecting all samples. The samples will be tested for: 0 BTEX by EPA method 8020; reporting limits of 0.5 [.g/L • TPH-G by EPA method 8015m; reporting limits of 50 [.g/L A chain of custody document, listing all samples collected and their intended analyses, will accompany the samples from the field to the laboratory, thereby providing a means to track the movement of the samples and ensure their integrity. 3.2 Deep Aquifer Plume Control Groundwater monitoring has been conducted at the site since 1994 - a period of over ten years (see Table 2 in Appendix A). During this time the contaminant plume has migrated with the groundwater flow that is predominantly to the northwest. The down gradient plume extends as far as well set MW-8/108/208 and continues beyond that point. .r It is appropriate to begin remediation of the plume because inaction allows the plume to spread and this will increase the costs of cleanup. The highest contaminant concentrations detected are in the on site wells located in the former dispenser island area. GTI proposes to begin source remediation of the core of the contaminant plume using convention pump and treat technologies with subsequent discharge to the City of Stockton POTW. The following