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Canepa's Car Wash <br /> 6230 Pacific Avenue,Stockton,CA <br /> Fust Quarter Groundwater Monitoring Report,January 2006 <br /> Page 4 of 9 <br /> ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and 1,2- <br /> dibromoethane (EDB) <br /> IThe current (January 2006) laboratory analytical results for soil vapor extraction well SV-4 indicate <br /> decreased concentrations of BTEX, MTBE, and TPH-G relative to historic laboratory analytical results <br /> for that well <br /> Current groundwater sample laboratory analytical results for the groundwater monitoring wells indicate <br /> that none of the constituents of concern were detected at or above the laboratory detection limits in MW- <br /> 4, MW-9, or MW-12D, which is consistent with historic results for those wells Contaminant <br /> concentrations detected in monitoring well MW-1 have remained at historic highs since MW-1 was <br />' designated the primary pumping well for the on-Site treatment system in October 2004 (with the <br /> exception of concentrations detected in the groundwater samples collected during the December 1994 and <br /> June 1995 monitoring events) EDB was detected for the second time at the Site in MW-1 at a <br /> concentration of 3 4 µg/L Current groundwater sample laboratory analytical results for monitor well <br /> MW-3 are generally consistent with historic results <br /> Benzene and MTBE iso-concentration contour maps are included as Figures 4 and 5 (Attachment A), <br /> respectively Historic laboratory analytical results from groundwater samples collected from MW-3 <br /> indicate a trend of increasing MTBE concentrations since April 11, 2001 (Figure 6, Attachment A) <br /> Groundwater sample laboratory analytical results for the current monitoring event are provided in Table <br /> 3, on the following page Laboratory certificates of analyses and chain of custody records are included in <br /> Attachment F <br /> • <br /> �.1a CONDOR <br />