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Groundwater elevations decreased approximately 0 77 feet from the previous ' event performed in August 2004 The elevations ranged from—20 20' to-- 21 00' MSL The groundwater flow direction is easterly at a gradient of approximately 5 04 x 10-3 feet per linear foot 1 23 BTEX and TPH-G Analytical Results ' Petroleum hydrocarbons of benzene, toluene, ethylbenzene, xylenes, and TPH-G were detected in the groundwater sample from well MW-2 However, the BTEX and TPH-G concentrations increased from the previous event, due to temporarily disengaging the sparging system There were no detectable BTEX or TPH-G concentrations measured in the samples collected from wells MW-1, MW-3, and MW-4 The current BTEX concentrations were evaluated against the California Drinking Water Maximum Contaminant Levels (MCL)s The MCLs in ' groundwater are benzene (1 µg/L), toluene (150 µg/L), ethylbenzene (700 µg/L), and xylenes (1,750 µg/L) Based on the current groundwater monitoring data, the MCLS for benzene, toluene, and xylenes have been ' exceeded in well MW-2 2.4 Oxygenates Analytical Results Unlike the previous event, there were no oxygenate analytes with detectable ' concentrations in well MW-2 The analyte TBA, which was previously detected in well MW-2, was reported as non-detect at X250 ug/L However, the detection limits were elevated for well MW-2 during this event due to matrix interferences There were no detectable oxygenates measured in the remaining wells 10 December 2004 Quarterly Groundwater Monitoring Report Earthgrains Baking Companies,Inc (Former Kilpatrick s Bakeries Inc) 1717 South Center Street Stockton,Callfomia Prepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp H%EN V\624001121121392EGtiProiects\Stockton Center StUnvesugatne and Quarterly ReportsVQuarterly Report 12_2004 doe January 18,2005