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+• Ms. Victoria McCartney S E C O R <br /> June 10, 2005 <br /> Page 3 <br /> approximately 3.18 cumulative pounds of dissolved MtBE has been removed from the <br /> groundwater. <br /> Extracted groundwater analytical data and MtBE mass removal estimates are presented in <br /> Tables 1 and 2 respectively. Certified analytical reports and chain-of-custody <br /> documentation are included in Attachment 2. Field data sheets for the batch extraction <br /> ' events are included in Attachment 3. <br /> MARCH AND APRIL, 2005 <br /> On March 1, 9, 15, 22 and 29, and April 5, 12, 19 and 26, 2005, IWM, under the supervision <br /> of SECOR, extracted approximately 28,500 gallons of groundwater from wells MW-6S and <br /> MW-8 (Figure 2) using a submersible pump at a pumping rate of approximately five gpm. <br /> Based on the data collected during this event, approximately 0.40 pound of dissolved MtBE <br /> was removed from the groundwater. To date, approximately 3.58 cumulative pounds of <br /> dissolved MtBE has been removed from the groundwater. <br /> 6& <br /> Extracted groundwater analytical data and MtBE mass removal estimates are presented in <br /> Tables 1 and 2 respectively. Certified analytical reports and chain-of-custody <br /> documentation are included in Attachment 2. Field data sheets for the batch extraction <br /> events are included in Attachment 3. <br /> GROUNDWATER CONCENTRATION TRENDS <br /> } MtBE and tert-butyl alcohol (TBA) concentrations over time in MW-6 INI, MW-6 FIN, MW-8 <br /> INI, and MW-8 FIN are presented in Figures 3 through 6. MtBE concentrations in MW-6 <br /> and MW-8 have declined since batch extraction began in November 2003. <br /> L <br /> 1A0hevron1914521REP0RTSlBatch Extractionlbatch groundwater extraction report.doc <br /> t., <br />