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using dedicated bailers The groundwater samples were decanted from the bailers into 40-m1 volatile organic analysis (VOA) vials, preserved with hydrochloric acid and sealed without headspace All of the samples were labeled and stored on ice for transport to Kiff Analytical, LLC of Davis, California (ELAP #2236) under appropriate chain-of-custody documentation Well sampling field logs are included in Appendix A Well sampling purge water was stored in 55-gallon steel drums, labeled and left on-site for temporary storage until proper off-site disposal can be arranged 4 . 0 GROUNDWATER SAMPLE ANALYSIS The groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethylbenzene, total xylenes (collectively known as BTEX), the fuel oxygenates, and halogenated volatile organic compounds (HVOCs) by EPA Method 8260B, and total petroleum hydrocarbons as diesel (TPH-D) by EPA Method 8015 with silica gel cleanup The analytical results for this and previous sampling periods are presented in Table Two The certified analytical report and chain-of- custody documentation are included in Appendix B • 5.0 CONCLUSIONS lsoconcentration contour maps for TPH-G and MTBE in the shallow water- bearing zone are presented as Figures 5 and 6, respectively Hydrocarbon concentrations this quarter are generally similar to those reported during the previous sampling event Notable changes include the first reported appearances of PCE in MW-6, TBA in MW-11, and MTBE in MW-17 TPH-D concentrations decreased significantly in monitoring wells MW-8, MW-9, MW-19, and recovery well RW-1 TPH-G concentrations also significantly decreased in MW-19 and RW-1 The TPH-G concentration increased in monitoring well MW-5 and the TPH-D concentration increased in MW-12 Additionally, ethanol was detected in monitoring well MW- 17 and recovery wells RW-1 through RW-3 • Frank's One Stop Quarterly Report — March 2004 Sampling -3-