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r <br /> . polyethylene bailers The groundwater samples were decanted from t h e <br /> bailers into 40-m1 volatile organic analysts (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 /> The site drinking water well was sampled through a sampling port and was <br /> purged prior to sampling <br /> Well sampling purge water was disposed of through the onsite activated <br /> carbon treatment system <br /> 4 . d GROUNDWATER SAMPLE ANALYSIS <br /> The groundwater samples were analyzed for total petroleum <br /> hydrocarbons as diesel (TPH-D) by EPA Method 351018015, and total <br /> petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethyl <br /> benzene and total xylenes (collectively known as BTEX), fuel oxygenates, <br /> lead scavengers, and 1,2-dichloropropane by EPA Method 8260 The <br /> analytical results for this and previous sampling periods are presented in <br /> .l Table Two and Three The certified analytical report and chain-of-custody <br /> documentation are included as Appendix B <br /> 5.4 CONCLUSIONS <br /> The analytical results this quarter show a general decrease in hydrocarbon <br /> concentrations from previous results Free-floating hydrocarbons were <br /> still present on the groundwater surface in monitoring well MW-5 <br /> Isoconcentration maps for TPH-G, benzene, and MTBE in the shallow <br /> water-bearing zone are presented as Figures 5 through 7, respectively <br /> TPH-G was detected in groundwater samples collected from monitoring <br /> wells MW-6, MW-13, and MW-19 Benzene was detected in groundwater <br /> samples collected from monitoring well MW-13 MTBE was detected in <br /> groundwater samples collected from monitoring wells MW-7, MW-8, <br /> MW-9, MW-13, MW-14, MW-15, MW-19, and MW-20 Overall the MTBE <br /> concentrations in groundwater samples collected this quarter decreased <br /> from the previous results <br /> 1,2-dichloropropane was detected in groundwater samples collected from <br /> monitoring wells MW-7, MW-8, MW--11, MW-12, MW-17, MW-18, and the <br /> Frank's One Stop Quarterly Report — December 2000 Sampling <br /> -3- <br />