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using dedicated bailers The groundwater samples were decanted from t h e <br /> bailers into 40-m1 volatile organic analysis (VOA) vials, preserved with <br /> hydrochloric 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 /> and total petroleum hydrocarbons as diesel (TPH-D) by EPA Method <br /> 3510/8015 The analytical results for this and previous sampling periods <br /> are presented in Table Two The certified analytical report and chain-of- <br /> custody documentation are included as Appendix B <br /> 5.0 CONCLUSIONS <br /> lsoconcentration contour maps for TPH-G, benzene, and MTBE in the <br /> shallow water-bearing zone are presented as Figures S through 7, <br /> respectively <br /> The TPH-G, BTEX, and/or oxygenate concentrations have increased or been <br /> newly detected in the groundwater samples collected from monitoring <br /> wells MW-11, MW-14, MW-15, MW-16, and MW-20 The TPH-G, BTEX, <br /> and/or oxygenate concentrations have decreased in the groundwater <br /> samples collected from monitoring wells MW-3, MW-5, MW-8, and MW- 19 <br /> this quarter The TPH-D concentrations in the groundwater samples <br /> collected from MW-7, MW-8, MW--11, and MW-15 have increased since the <br /> previous quarter The TPH-D concentrations in the groundwater samples <br /> collected from MW-9 and MW-10 have decreased since the last quarter <br /> Benzene and MTBE concentrations in monitoring wells MW-13 and MW- 14 <br /> exceeded the California Department of Health Services (DHS) maximum <br /> contaminant level (MCL) The MTBE concentrations in monitoring well <br /> MW-19 and MW-20 also exceeded the DHS MCL for drinking water The <br /> rbenzene concentration in monitoring well MW-5 also exceeded the DHS <br /> MCL for drinking water <br /> Frank's One Stop Quarterly Report — September 2002 Sampling <br /> -3- <br />