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Former Chevron Station 13 March 2002 <br />301 West Kettleman Lane, Lodi <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 µg/l. 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 (915) 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 />