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1 <br />' using dedicated bailers The groundwater samples were decanted from the <br /> bailers into 40-m1 volatile organic analysis (VOA) vials, preserved with <br /> rhydrochloric acid and sealed without headspace All of the samples were <br /> labeled and stored on ice for transport to Kiff Analytical, LLC of Davis, <br />' California (ELAP #2236) under appropriate chain-of-custody <br /> documentation Well sampling field logs are presented in Appendix A <br />' Well sampling purge water was stored in 55-gallon steel drums, labeled <br /> and left on-site for temporary storage until proper off-site disposal can be <br /> arranged <br />' 4 . 0 GROUNDWATER SAMPLE ANALYSIS <br />' The groundwater samples were analyzed for total petroleum hydrocarbons <br /> as gasoline (TPH-G), benzene, toluene, ethylbenzene, total xylenes <br />' (collectively known as BTEX), and the 7 oxygenates by EPA Method 8260B <br /> The analytical results for this and previous sampling periods are presented <br /> in Table Two The certified analytical report and chain-of-custody <br />' documentation are included as Appendix B <br /> 5.0 CONCLUSIONS <br /> Isoconcentration contour maps for TPH-G, benzene, and MTBE in the <br /> shallow water-bearing zone are presented as Figures 5 through 7, <br /> respectively <br /> The TPH-G, BTEX, and/or oxygenate concentrations have remained <br /> relatively consistent with previous findings in the groundwater samples <br /> collected from monitoring wells MW-13 and MW-15 The TPH-G, BTEX, <br /> and/or oxygenate concentrations have decreased in the groundwater <br /> samples collected from monitoring wells MW-5, MW-6, MW-14, MW- 19, <br /> and MW-20 this quarter <br /> Benzene and MTBE concentrations in monitoring well MW-14 exceeded the <br /> California Department of Health Services (DHS) maximum contaminant <br /> level (MCL) for drinking water The MTBE concentrations in monitoring <br /> wells MW-13 and MW-19 also exceeded the DHS MCL for drinking water <br /> The benzene concentration in monitoring well MW-5 also exceeded the DHS <br /> MCL for drinking water <br /> INo benzene or MTBE is currently being detected in any of the on-site <br /> • groundwater monitoring wells <br /> Frank's One Stop Quarterly Report — December 2002 Sampling <br /> I -3- <br />