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' only oxygenate detected and only in well MW-2 The detectable <br /> concentration for MTBE was dust above the reporting limit <br /> 1 The SVE system was taken out of operation after the July 23, 2004 monitoring <br /> event in order to repair the system and to simultaneously go into the non- <br /> operational timeframe of the "pulsed" mode operation Pulsed operation can <br /> allow soil vapor concentrations to rebound during the intervals of non- <br /> operation <br />' The August 2004 quarterly groundwater-monitoring event indicated that the <br /> groundwater elevation decreased approximately 173 feet from the previous <br /> event performed in April 2004 During this event, the average depth to <br /> groundwater was 29 46 feet bgs (-19 69 feet msl) The groundwater flow was <br /> easterly at a gradient of approximately 0 006 foot per linear foot The <br />' concentrations of BTEX and TPH-G increased in well MW-2,presumably due <br /> to the air sparging/soil venting system being temporanly out of service There <br /> were no detectable concentrations of BTEX or TPH-G in the samples <br /> t collected from wells MW-1, MW-3, or MW-4 The only oxygenate detected <br /> was TBA in well MW-2 <br /> The December 2004 quarterly groundwater-monitoring event indicated that <br /> the groundwater elevation decreased approximately 0 77 foot from the <br /> previous event performed in August 2004 During this event, the average <br /> depth to groundwater was 30 22 feet bgs (-20 46 feet msl) The groundwater <br /> flow was easterly at a gradient of approximately 0 005 foot per linear foot <br /> The concentrations of BTEX and TPH-G increased in well MW-2, due to the <br /> air sparging/soll venting system being temporarily out of service BTEX and <br /> TPH-G were not detected in the samples collected from the remaining wells <br /> MW-1, MW-3, or MW-4 Oxygenates were not detected in the samples <br />' collected during this event The SVE system was placed back into operation <br /> on December 15, 2004 <br /> • <br />' S <br /> Quarterly Groundwater Monitoring Report <br /> March 2005 <br /> Prepared for SARA LEE BAKERY GROUP,INC Prepared by Philip Services Corporation <br /> ]nvestigntive and Quarterly Report 51St Quarterly Report 03_2005(final) September 23,2005 <br />