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4 S[IMMARY AND RECOMMENDATIONS <br /> Groundwater-momtonng 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 average depth to groundwater among the wells was <br /> ' 26 34 feet bgs (-16 58 feet msl) The groundwater flow was generally easterly <br /> at a gradient of about 0 004 foot per linear foot <br /> ' • Benzene, toluene, xylenes, and TPH-G concentrations increased in well MW- <br /> 2, since the previous event Ethylbenzene and oxygenates were not detected <br /> in well MW-2 during this monitoring event <br /> • The current BTEX concentrations were compared to the California Drinking <br /> Water MCLs Based on the current groundwater-monitoring data, only the <br /> ' MCL for benzene was exceeded in well MW-2 <br /> • BTEX, TPH-G, and oxygenates were not detected in any of the remaining <br /> ' samples <br /> • During the first quarter groundwater-monitoring event, the system was turned <br /> M off to collect the groundwater samples, and upon collecting the groundwater <br /> samples, the blower would not turn back on Maintenance was scheduled <br /> The system was repaired and re-engaged on May 20, 2005 Hence, the <br /> weekly air-monitoring samples could not be collected during this period <br /> Based on the results of the May 2005 sampling event, it appears that further <br /> groundwater remediation is warranted at the facility PSC recommends that the <br /> current quarterly groundwater-monitoring plan and the air sparging/soil venting <br />' continue as is <br /> 9 <br /> Quarterly Groundwater Monitoring Report � <br /> May 2005 <br /> Prepared for SARA LEE BAKERY GROUP,INC Prepared by Philip Services Corporation <br /> Investigative and Quarterly Report 52nd Quarterly Report 05_2005(final) September 23,2005 <br />