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GEQMATRIX <br /> wells MW3-4 and MW3-5 During the third quarter 2004 monitoring event, TPHg and BTEX <br /> were detected in groundwater samples from monitoring wells MW3-1, MW3-2, and MW3=6. <br /> L Groundwater samples from the downgradient well and the wells near the former,UST <br /> consistently have detections of TPHg and BTEX compounds (Table 3). -MTBE was removed as <br /> a constituent of concern at UST Site No. 3 because it has not been detected in groundwater <br /> samples collected at the site. MTBE was not detected in third quarter 2004 groundwater <br /> Usamples. <br /> { During third quarter 2004, the highest concentrations of TPHg, toluene, ethylbenzene, and <br /> xylenes were detected in the groundwater sample from well MW3-2, and the highest <br /> concentration of benzene was detected in the groundwater sample from well MW3-6. Time <br /> U concentration plots are included with groundwater elevation plots for each of the site monitoring <br /> wells in Figures 5, 6, and 7.. <br /> r <br /> 4.0 CONCLUSION <br /> Groundwater gradient, elevation, and groundwater sample analytical results are consistent with <br /> previous monitoring results. The concentrations of TPHg and BTEX fluctuate seasonally, but <br /> have remained within a consistent range during the period of record. <br /> 5.0 REFERENCES <br /> L <br /> Geomatrix Consultants, Inc., 2003, Results of Additional Assessment and Remediation <br /> Evaluation of Petroleum Hydrocarbons in Groundwater, Site No. 3 (Site Code 1282-124); <br /> prepared for the Port of Stockton (Geomatrix, 2003). <br /> 'Geomatrix Consultants, Inc., 2004, Fourth Quarter 2003 Groundwater Monitoring Report, Site <br /> No. 3 (Site Code 1282-124), prepared for the Port of Stockton (Geomatrix, 2004). <br /> 1:TROI£CT16000s16437A0016437-23.doe 4 <br /> U <br />