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i IDW will be sampled and submitted to the District's laboratory for waste characterization as specified in the July 1993 Additional Assessment and Groundwater ' Monitoring Work Plan (Work Plan) Upon receipt of the waste profile characterization results, the IDW will be disposed of appropriately Groundwater samples were collected on March 27, 1996, from five of the rune monitoring wells (MW-1, MW-4, MW-5, MW-8, and MW-9) Samples from wells MW-4 and MW-5 were collected using disposable polyvinyl chloride (PVC) bailers. Samples from wells MW-1 and MW-8 were collected using dedicated Teflon bailers Samples from well MW-9 was collected using a dedicated PVC bailer One sample from each well was collected and submitted for analysis by Umted States Environmental Protection Agency (USEPA) Method 8020 for benzene, toluene, ethylbenzene,xylenes (BTEX), and methyl tertiary-butyl ether (MTBE), and Method 8015 Modified for TPH-g All samples were submitted to the District's State certified laboratory along with the appropriate Chain-of-Custody forms Quality control samples were collected to provide a check on the sampling, analysis, and shipping procedures One duplicate sample was collected from MW-9 and submitted to the District's laboratory and one split sample was collected from MW-8 and submitted to Anlab Analytical Laboratory for identical analyses as the original samples to provide a check on analytical procedures One 40 milliliter (mL) vial trip blank was submitted to the District's laboratory for BTEX and MTBE analysis to provide a check on shipping procedures 4.3 Analytical Results ' Analytical results from first semester 1996 sampling and dissolved oxygen momtoring results are included in Table 2 The laboratory data sheets are provided ' in the Appendix The quality control results are not included in Table 2, but are included in the Appendix. The precision of duplicate and split results when ' compared to field results, and the absence of hydrocarbons In the trip blank quality control sample, confirm that samples were collected, shipped, and analyzed appropriately Based on data collected over the last two years, the approximate extent of the petroleum hydrocarbon plume is shown on Figure 4-3 However, based on the most recent data collected on March 27, 1996, the plume is limited to well MW-8 A summary of analytical results from all groundwater and soil sampling conducted at i the site since June 1989 is presented in Tables 2 and 3, respectively. ' 96R7 East Bay Municipal Utility District 40429600\1stsem gw 5 Stockton Service Center-First Semester 1996