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one groundwater sample collected in November 2002, however, its detection is considered anomalous since it was never detected at any other time The oxygenate compound TBA was detected in one groundwater sample collected from MW-1 on November 8, 1999 and from PZ-1 samples collected on October 18, 2001 and April 20, 2001, but has never been detected in any other groundwater sample collected at the site until November 2002 The detection of TBA in two groundwater samples collected from wells M W-10 and MW-13 in November 2002 is considered anomalous because these wells are located in areas that are relatively unaffected from the leaking UST and TBA concentrations have never before been detected at these locations The oxygenate compound DIPE has historically been measured at concentrations of 140 µg/L or less in samples collected from wells near the source of the release Current oxygenate concentrations are further discussed in Section 3 4 2 of this report 3.4.1 June 2004 TPH/BTEX Conditions In Groundwater ' Groundwater samples collected in June 2004 were the second set obtained since the site's remediation system was disengaged in December 2002 The previous groundwater monitoring event was performed in February 2003 Data collected from this most recent sampling, summarized in Table 7, was used to assess the stability or trend of petroleum hydrocarbon impact to groundwater Laboratory ' reports are contained in Appendix B BTEX compounds were measured in groundwater samples collected from wells MW-1, MW-11, SP-1, SP-2, PZ-1 and PZ-2 As shown in Figure 6, detectable benzene concentrations ranged from 2 1 ug/l in the sample from MW-11 to 2,200 ug/l in the sample from PZ-1 The detection of benzene in the MW-11 sample may be an anomaly since it had only been measured once before in samples from this well The relatively high benzene concentration in the PZ-I sample is a reversal of the decreasing trend that had been displayed at this location for the past two years The current benzene concentration in the PZ-1 sample is still less than the maximum of 5,100 ug/l measured in October 2001 Relatively stable or continued decreases of BTEX concentrations, compared to historic levels, are displayed in current samples from MW-1, SP-1, SP-2 and PZ-2 TPH-G concentrations were measured in groundwater samples collected from MW-1, MW-11, MW-12, SP-1, SP-2, SP-4, SP-6, PZ-1 ' and PZ-2 AS shown in Figure 7, detectable TPH-G concentrations ranged from 120 ug/l in the sample from MW-12 to 19,000 ug/l from 13 June 2004 Site Investigation Report no Earthgains Company Facility 2651 South Airport Way-Stockton,California Prepared for SARA LEE BAraNG GRotrr Prepared by Philip Services Corp H EW624001321121382EG1StocktonUune 2004 ravestigabon Repon doc August 9,2004