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using the DPT rig. The soil samples will be labeled, packaged and stored in an iced cooler <br /> for transport under chain-of-custody manifest to a state of California certified analytical <br /> Claboratory. Each of the soil borings will be logged for hydrgeologic and lithologic <br /> characteristics by a geologist and screened using an organic vapor meter equipped with a <br /> photoionization detector. <br /> A groundwater grab sample will be collected from each of the sample locations. Groundwater <br /> will be collected by lowering a polyethylene tubing and check valve system down the <br /> borehole and into the groundwater column. Groundwater will be pumped to the surface using <br /> an oscillating motion. The groundwater grab samples will be contained in laboratory-supplied <br /> bottles, labeled, packaged, and stored in an iced cooler for transport under chain-of-custody <br /> manifest to a state of California certified analytical laboratory. <br /> { 2.3 Laboratory Analyses <br /> L A total of six (6) groundwater grab samples and 19 soil samples will be submitted to a state <br /> of California certified laboratory for analysis of Total Petroleum Hydrocarbons (TPH)-as- <br /> diesel by modified EPA Method 8015 and for benzene, toluene, ethylbenzene and xylenes <br /> (BTEX) by modified EPA Method 8020 on a standard turnaround time. The six groundwater <br /> samples will also be analyzed for methyl tertiary butyl ether (MTBE) by modified EPA <br /> Method 8020 on a standard turnaround time. <br /> 2.4 Preliminary Investigation Evaluation Report <br /> In accordance with Tri-Regional Board Staff recommendations, IT will report the methods <br /> and findings associated with the site investigation in a Preliminary Investigation Evaluation <br /> Report (PIER). In addition to a standard discussion of methods, the PIER will include the <br /> following: <br /> • Site location map and site plan; <br /> • Figures depicting extent of impacted soil and groundwater; <br /> • Boring logs and cross sections, if appropriate; <br /> • Tables summarizing laboratory results. <br /> 3.0 Schedule <br /> Upon approval of this work plan, IT will complete the project in approximately 10 weeks. A <br /> Gantt Chart,showing the durations of each of the four tasks is included as Figure 3. <br /> 4 <br /> i <br />