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ti ai. L 0 <br /> Flag City Chevron - 2 - 22 August 2003 <br /> 6421 Capitol Avenue, Lodi <br /> �• Comment: <br /> I concur with the recommendations in the Report You may alternate the groundwater extraction in <br /> extraction wells EW-7, EW-8, EW-9, and EW-10 while continuously operating the remainder of the <br /> extraction wells Please submit a Workplan by 15 October 2003 for the Geoprobeg grab groundwater <br /> investigation, which includes the prior recommendation from the <br /> Site Assessment Report—Fourth Quarter 2002 for EPA Method 8270 to identify unknown spikes in the <br /> TPHd chromatographs from that investigation. <br /> Please continue to work with the manufacturer of the treatment system and resolve the issue of <br /> unanticipated breakthrough of MtBE in the Granulated Activated Carbon(GAC) units. It is my <br /> understanding from a conversation with AGE that back-flushing of the GAC units will remove <br /> channeling, which is the suspected cause of the unanticipated breakthrough of MtBE <br /> Please contact meat (916) 255-3115 with any questions or comments. <br /> .(PA, <br /> aures VL Barton, R.G <br /> Engineering Geologist <br /> (. cc- Mr Mark Owens, UST Cleanup Fund, SW-RCB, Sacramento <br /> Mr Mike Infiarna, San Joaquin County Environmental Health Division, Stockton <br /> Mr Timothy J Cuellar, Advanced GeoEnvironmental, Incorporated, Stockton <br /> Mr Scott Rishwain, Rishwain &Rishwain, Stockton <br /> Mr Ben Guzman, San Joaquin County Municipal Utilities, Stockton <br /> i <br /> I <br />