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40 GROUNDWATER ANALYTICAL RESULTS <br /> Groundwater laboratory analytical results are summarized in Table 1 In the Third Quarter 2003, the <br /> highest benzene and TPHg concentrations were detected in MW-3 at 1,900 ug/1 and 19,000 ug/l, <br /> respectively The highest MTBE concentration was detected in monitoring well MW-2 at and 170 <br />' ug/l Other oxygenates were not detected above the laboratory reporting limits in samples collected <br /> from the groundwater monitoring wells Well AS-1, located within the source area and screened <br /> from 40 to 45 feet below ground surface (bgs) (deeper than the monitoring wells), was sampled for <br />' the third and fourth time since the startup of remedial activities The groundwater sample collected <br /> from AS-1 did not contain concentrations of TPHg, BTEX, or oxygenates above the laboratory <br />' ieporting limits (Table 1) for the Second and Third Quarter Copies of the laboratory analytical <br /> reports and chain-of-custody documents for the groundwater samples wells are included in <br /> Appendix C <br /> A decreasing contaminant trend in groundwater was observed from the start of remediation <br /> (September 2002) to the Second Quarter (April 2002) The Third Quarter groundwater analytical <br /> data demonstrated an end to the decreasing trend Contaminant concentrations in groundwater <br />' increased in the plume area <br /> There were no established trends for the analytical data for dissolved metal concentrations from <br /> wells MW-5, MW-5D (not sampled Q3 dile to pump loss), MW-6, and MW-9 (Table 2) The <br /> collected data will be compared with future dissolved metal concentrations in order to monitor the <br /> effects of the ozone sparge remedial system Copies of the laboratory analytical reports and chain-of- <br /> custody documents for the groundwater samples collected from the groundwater monitoring wells <br /> are included in Appendix C <br /> Domestic Well Analytical Results <br /> The water samples collected from domestic wells DW-2R, DW-3 (no Third Quarter sample), and <br /> DW-4 sampled quarterly did not contain detectable concentrations of TPHg, BTEX, oxygenates, <br /> 1,2 DCA, or EDB DW-1, sampled monthly did not contain detectable concentrations of TPHg, <br /> BTEX, oxygenates, 1,2-DCA, or EDB Copies of the laboratory analytical reports and chain-of- <br /> custody documents for the water samples collected from the domestic wells are included in <br /> Appendix C <br /> 1 0 <br /> S9643 06-01 -9- illy 25 2003 <br />