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only oxygenate detected and only in well MW-2 The detectable concentration for MTBE was Just above the reporting limit ' The SVE system was taken out of operation after the July 23, 2004 monitoring event in order to repair the system and to simultaneously go into the non- operational timeframe of the "pulsed" mode operation Pulsed operation can allow soil vapor concentrations to rebound during the intervals of non- operation The August 2004 quarterly groundwater-monitoring event indicated that the groundwater elevation decreased approximately 1 73 feet from the previous event performed in April 2004 During this event, the average depth to groundwater was 29 46 feet bgs (-19 69 feet msl) The groundwater flow was easterly at a gradient of approximately 0 006 foot per linear foot The ' concentrations of BTEX and TPH-G increased in well MW-2, presumably due to the air sparging/soll venting system being temporarily out of service There were no detectable concentrations of BTEX or TPH-G in the samples ' collected from wells MW-1, MW-3, or MW-4 The only oxygenate detected was TBA in well MW-2 The December 2004 quarterly groundwater-monitoring event indicated that the groundwater elevation decreased approximately 0 77 foot from the previous event performed in August 2004 During this event, the average depth to groundwater was 30 22 feet bgs (-20 46 feet msl) The groundwater flow was easterly at a gradient of approximately 0 005 foot per linear foot The concentrations of BTEX and TPH-G increased in well MW-2, ' presumably due to the air sparging/soii venting system being temporarily out of service BTEX and TPH-G were not detected in the samples collected from the remaining wells MW-1, MW-3, or MW-4 Oxygenates were not detected in the samples during this event The SVE system was placed back into operation on December 15, 2004 ' The March 2005 quarterly groundwater-monitoring event indicated that the groundwater elevation increased approximately 155 feet from the previous event performed in December 2004 During this event, the average depth to ' groundwater was 28 68 feet bgs (-18 91 feet msl) The groundwater flow was easterly at a gradient of approximately 0 005 foot per linear foot BTEX and TPH-G concentrations decreased in well MW-2 BTEX and TPH-G were not ' detected in the samples collected from wells MW-1, MW-3, or MW-4 There were no oxygenates detected during this event There were no operational or maintenance issues with the SVE system during the monitoring event ' Although, after the groundwater samples were collected, the SVE system did not function properly upon re-engagement Maintenance of the system was scheduled 5 Quarterly Groundwater Monitoring Report May 2005 Prepared for SARA LEE BAKERY GROUP,INC Prepared by Philip Services Corporation ' Investigative and Quanerly Report\2nd Quanuly Report 05-2005(final) September 23,2005