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San Joaquin County DIRECTOR <br /> o NDonna Heran,REHS <br /> .F. .o <br /> Environmental Health Department ASSISTANTDIRECTOR <br /> 600 East Main Street Laude Colulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> _ Cad Borgman,REHS <br /> lam' • Mike Huggins,REHS,RDI <br /> Cq(iFp' c� P Website:www.sJgov.org/ehd Margaret Lagorio,REHS '... <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,ROI <br /> Kasey Foley,REHS <br /> June 2, 2008 <br /> Diggler and Wad LLC Mr. Sergio Moreschalchi <br /> Scott Damouny Atlantic Richfield Company <br /> 2707 E. Fremont St., Suite 14 PO Box 1257 <br /> Stockton, CA 95205 San Ramon, CA 94583 <br /> Subject: former ARCO Gas #443 Site Code: RO-1781 <br /> 2478 E. Oak Street APN: 14124023 <br /> Stockton, CA 95205 Global ID#: T0607798060 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Quarterly Groundwater Monitoring Report First Quarter 2008 dated May 15, 2008, <br /> prepared by Secor International for the above subject site, and has the following <br /> comments. <br /> The report discusses the ground water monitoring well sampling event conducted on <br /> March 20, 2008 which is the fourth sampling event for the monitoring wells that were <br /> installed in June 2007. <br /> The EHD previously approved a request from Shell Oil, the active responsible party for <br /> the Shell Oil gas station located directly south of this site, across Fremont Street, to <br /> postpone submittal of their feasibility study until four quarters of ground water <br /> monitoring and sampling had been completed at this site. This report completes the <br /> condition of four consecutive quarterly and monitoring reporting of the ARCO monitoring <br /> wells for postponement of Shell's feasibility study. The EHD has directed Shell to <br /> conduct interim remedial action until a final remedial action plan is approved. <br /> Conclusions included in the report stated that the lateral and vertical extents of gasoline <br /> range organics (GRO), benzene, and 1,2-Dichloroethane (1,2-DCA) in the ground water <br /> have not been fully delineated. Recommendations included continued sampling and <br /> monitoring of the monitoring wells and a work plan submittal to the EHD by July 10, <br /> 2008 for additional lateral and vertical assessment. <br /> l <br /> The EHD concurs with the conclusions and recommendations included in the report but <br /> also requires ARCO to conduct interim remedial action at the site to halt the spread of <br /> contaminants in the ground water. The work plan due on Geotracker for review by <br /> the EHD on July 10, 2008 is to include a proposal for interim corrective action. <br /> 2478 E.Oak Street Dir TRAP 6-5-08.doc <br />