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• using dedicated bailers The groundwater samples were decanted from t h e 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 presented in Appendtx 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) by EPA Method 8260B and total petroleum hydrocarbons as diesel (TPH-D) by EPA Method 8015 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 as Appendix B 5.0 CONCLUSIONS lsoconcentration contour maps for TPH-G, benzene, and MTBE in the shallow water-bearing zone are presented as Figures 5 through 7, respectively The TPH-D, TPH-G, and BTEX concentrations have remained relatively consistent with previous findings in the groundwater samples collected from monitoring wells MW-4, MW-11, MW-14, and MW-16 The TPH-D, TPH-G, and BTEX concentrations have decreased sharply in the groundwater samples collected from monitoring well MW-6 this quarter There was a slight increase in hydrocarbon concentrations in groundwater samples collected from monitoring well MW-5, although there is still a long { term decreasing trend in this well Low hydrocarbon concentrations were detected in groundwater samples collected from monitoring well MW- 15 this quarter for the first time Hydrocarbon concentrations increased from the previous two quarters in monitoring well MW-19, although the results remain similar to previous results Hydrocarbon concentrations in groundwater samples collected from monitoring well MW-13 continue to show a decreasing trend Hydrocarbon concentrations detected in the • groundwater sample collected from monitoring wells MW-3, MW-7, MW-8, Frank's One Stop Quarterly Report — April 2003 Sampling -3-