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temperature, and conductivity of the purge water were monitored during evacuation, and samples were not collected until these parameters stabilized Monitoring wells MW-5, MW-15, MW-19, and recovery wells RW-2 and RW-3 contained very little water and therefore only one bailer of water was purged from each well prior to sample collection and pH, temperature and conductivity readings were not collected Samples were collected from the wells using the same disposable bailers The groundwater samples were decanted from the bottom of the bailers using low-flow sampling devices into 40-m1 volatile organic analysis (VOA) vials, preserved with hydrochloric acid and sealed without headspace All of t h e 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 0 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 to Table Two The certified analytical report and chain-of- custody documentation are included in Appendix B Additionally, laboratory analytical results for the split samples collected by the RWQCB during the June 30, 2004 sampling event are summarized in Tables Two and Three Isoconcentration contour maps for TPH-G and MTBE in the shallow water- bearing zone are presented as Figures 5 and 6, respectively 5.0 DOMESTIC WELL SAMPLING ASE has continued to operate and maintain the water filtration systems attached to the domestic wells at the residences adjacent to the site The analytical results for this and previous domestic well sampling periods are presented in Table Four The certified analytical reports and chain-of- custody documentation are included in Appendix B Frank's One Stop Quarterly Report — December 2004 Sampling -3-