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3 SUMMARY AND RECOMMENDATIONS <br /> Groundwater-monitoring has been conducted at this facility since 1999 to evaluate <br />' groundwater quality A summary of the current site conditions and a <br /> recommendation for subsequent work are as follows <br />' • During this event, the depths to groundwater among the wells average at about <br /> 30 22' (-20 46 MSL) The §roundwater flow was generally easterly at a <br /> gradient of about 5 04 x 10" feet per linear foot <br />' • Benzene, toluene, ethylbenzene, xylenes, and TPH-G concentrations in well <br /> MW-2 increased since the previous event <br /> ' + The current BTEX concentrations were evaluated against the California <br /> Drinking Water MCLS Based on the current groundwater-monitoring data, <br /> the MCLs for benzene, toluene, and xylenes have been exceeded in well MW- <br /> ' 2 <br /> • No oxygenates were detected, but the detection limits were elevated in well <br /> ' MW-2 <br /> Based on the results of the April 2004 sampling event, it appears that the remediation <br /> system sufficiently works in removing the contamination The system was taken out <br /> of operation after July 23, 2004 in order to operate the system in a "pulsed" mode <br /> ' The August 2004 sampling event occurred while the system was disengaged, as well <br /> as the December 2004 event The contaminant concentrations increased upon the <br /> temporary disengagement of the remediation system The system was placed back <br /> ' into operation in the "pulse" mode on December 15, 2004 FSC recommends that the <br /> current quarterly groundwater-monitoring plan and the air sparging/soil venting <br /> continue as is <br /> i' <br /> . <br /> December 2004 <br /> Quarterly Groundwater Monitoring Report <br /> ' Earthgrams Baking Companies Inc <br /> (Former Kilpatrick s Bakeries,Inc) <br /> 1717 South Center Street <br /> Stockton,California <br /> ' Prepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp <br /> H VENV\624001331!2 U82EGTmjects\Stockton Center SHnvesugauve and Quaricrly Repons\Quanerly Repan 12_2004 doc January 18,2005 <br />