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• _ • 22 August 2003 <br /> Flag City Chevron - 2 - <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 Geoprobe® 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 /> r <br /> A <br /> ames L. Barton, R.G. <br /> Engineering Geologist <br /> cc: Mr. Mark Owens, UST Cleanup Fund, SWRCB, Sacramento <br /> Mr. Mike Infurna, 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 />