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r .. <br /> Former Chevron Station <br /> 301 West Kettleman Lane, Lodi ;` - 2 - 13 March 2002 <br /> extraction wells south of Kettleman Lane are not necessary at this time As an interim measure, Secor proposes <br /> to complete batch extraction at all monitoring wells south of Kettleman Lane when concentrations of MtBE are <br /> confirmed to be above 5 pg/1 Board staff agree with this approach, and the 9 January 2002 FRP Addendum is <br /> approved <br /> As presented in the Q4-2001 Report,remedial system influent concentrations are declining Attached Figures 6 <br /> and 8 from the Q4-2001 Report show the cumulative mass removed for MtBE in groundwater is starting to <br /> flatten out, and the cumulative mass removed for MtBE in soil vapor is flat Based on this information, it is <br /> appropriate to optimize the SVE system by reconfiguring or pulsing the SVE system to continue removing more <br /> contaminant mass Please include a SVE optimization plan with the second quarter(Q2-2002) status report, <br /> which is due by 15 July 2002 <br /> Secor recommended continued operation of the SVE and GET remedial systems and continued quarterly <br /> monitoring and sampling Board staff concur with these recommendations The groundwater extraction must <br /> continue to stabilize the groundwater plume and prevent movement of MtBE toward City Well #12 if you have <br /> any questions or comments, please call me at(916) 255-3115 <br /> Marty Hartzell, R G <br /> Associate Engineering Geologist <br /> Attachment <br /> cc Mr Mark Owens, SWRCB,UST Cleanup Fund, Sacramento <br /> Mr Harlin Knoll, San Joaquin County Environmental Health Division, Stockton <br /> Mr David Evans, Secor International Incorporated, Sacramento <br /> Mr Frank Beeler, City of Lodi Water Department, Lodi <br />