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' U s <br /> INT SECRNATIONAL ��IlgoCerl�oa� Swte 100 <br /> S Rancho Cordova CA 95870 <br /> E C O R <br /> INCORPORATED 916.861-0400 TEL <br /> 916-861-0430 FAx <br /> March 22, 2005 <br /> James L L Barton <br /> Regional Water Quality Control Board — }„A <br /> Central Valley Region EAL <br /> 11020 Sun Center Drive #200 �NvRNt� RU� � <br /> Rancho Cordova, CA 95670 P <br /> RE Recommendations Clarification <br /> Former Chevron Service Station 9-5775 <br /> 301 West Kettleman Lane <br /> Lodi, California <br /> SECOR Project No 77CH 95775 05 0 170 <br /> Dear Mr Barton <br /> SECOR International Incorporated (SECOR), on behalf of ChevronTexaco Environmental <br /> Management Company (EMC), has provided this report to clarify the recommendation <br /> sections within SECOR's Fourth Quarter 2004, Quarterly Progress Report and <br /> Groundwater Modeling Report, dated January 13 and January 31, 2005, respectively <br /> Based on the date of submittal of each report, the recommendations presented within the <br /> Groundwater Modeling Report are intended to supersede the recommendations within the <br /> Fourth Quarter 2004, Quarterly Progress Report The recommendations within the <br /> Groundwater Modeling Report are shown in bold italics below <br /> Based on the results presented within this report, SECOR recommends the shut- <br /> down of the GWET system to monitor rebound If significant rebound is observed, <br /> the system will be restarted If no rebound occurs the system will remain offline until <br /> the hydrogen peroxide feasibility test is implemented <br /> However, based on declining concentrations of methyl tertiary butyl ether (MtBE) in <br /> extraction well EX-1, SECOR recommends that hydrogen pilot testing only be implemented <br /> If significant rebound is observed If significant rebound is not observed for two quarters <br /> following the shut down of the groundwater extraction and treatment (GWET) system, <br /> SECOR recommends that this site be considered for case closure <br /> Sincerely, <br /> SECOR International Incorporated <br /> M Evans Mike Stephens, CEG, C HG, REA ll <br /> Associate Engineer Senior Geologist <br /> DME <br /> I XChevronl957751Correspondence\RWQC8120051Clarnficatton doc <br />