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i <br /> ✓i'=� Geomatrix <br /> . groundwater samples from background wells MW3-4 and MW3-5 (Table 3), neither were <br />' detected in these wells during the second quarter 2005 monitoring event During the second <br /> quarter 2005 monitoring event, TPHg and BTEX were detected in groundwater samples from <br />' monitoring wells MW3-1, MW3-2, MW3-3, and MW3-6 (Table 3) Methyl tertiarybutyl ether <br /> was removed as a constituent of concern at UST Site No 3 because it has not been detected in <br /> groundwater samples collected at the site <br /> During second quarter 2005, the highest concentrations of TPHg and BTEX compounds were <br />' detected in the following wells xylenes in well MW3-2, ethylbenzene in well MW3-3, toluene in <br /> wells MW3-2 and MW3-3, and TPHg and benzene in well MW3-6 Time concentration plots <br /> are included with groundwater elevation plots for each of the site monitoring wells in Figures 5, <br /> 6, and 7 Although four of the wells were not purged following approved procedures, analytical <br /> results are consistent with historical analytical results Because analytical results are consistent <br />' with historical results, there is no reason to discount the second quarter 2005 groundwater <br /> analytical data at this time <br />' 4.0 CONCLUSION <br /> i• 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 witlun a consistent range during the period of record <br /> 5.0 REFERENCES <br /> Geomatnx 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 /> 1 <br /> 116000s16437 0001Arehive16437 030 doc 4 <br /> 1 <br />