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SECOR' wwwsecorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> 916 861-0430 FAx ` <br /> V <br /> January 30, 2004 <br /> Ms Lori Duncan d `� <br /> San Joaquin County Environmental Health Department304 F HEPL(�1 <br /> Stockton,kEast <br /> CA 95202 nue, Third Floor <br /> Weber ENv�R MM 5 Rv��ES <br /> pER <br /> RE Fourth Quarter 2003 Groundwater Monitoring Report <br /> Chevron Service Station 9-4275 <br /> 2905 Benjamin Holt Drive <br /> Stockton, California <br /> SECOR Project No 77CH 94275 04 0670 <br /> and <br /> Arco Service Station 2133 <br /> 2908 Benjamin Holt Drive <br /> Stockton, California <br /> SECOR Project No 77BP 52133 03 0336 <br /> Dear Ms Duncan <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the fourth quarter <br /> 2003 (4003) groundwater monitoring event at the above referenced commingled plume sites (Figure <br /> 1), and to summarize the 4003 remedial activities at ARCO service station 2133 <br /> COMPLETED ACTIVITIES — Fourth Quarter 2003 <br /> o Performed coordinated quarterly groundwater monitoring and sampling <br /> • Prepared and submitted quarterly groundwater monitoring report <br /> a Operated and maintained air sparge (AS) systems (CHEVRON and ARCO) <br /> PLANNED ACTIVITIES — First Quarter 2004 <br /> a Perform coordinated quarterly groundwater monitoring and sampling <br /> • Prepare and submit quarterly groundwater monitoring report <br /> • Operate and maintain AS system (CHEVRON and ARCO) <br /> GROUNDWATER MONITORING DISCUSSION (CHEVRON) <br /> On December 18, 2003, Gettler-Ryan conducted 4003 groundwater monitoring and sampling for <br /> Chevron service station 9-4275, in conjunction with SECOR performing groundwater monitoring and <br /> sampling for Arco service station 2133 Nine monitoring wells were sampled For liability reasons, <br /> the city of Stockton Municipal District would not operate Municipal well 4 10, and allow SECOR to <br /> collect a sample during 4Q03 Groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes (BTEX), and the <br /> fuel oxygenates methyl tertiary butyl ether (MtBE), ethyl-tertiary-butyl-ether (EtBE), di-Isopropyl ether <br /> (DIPE), tertiary-amyl-methyl-ether (TAME), tertiary-butyl-alcohol (TBA), 1,2 dlchloroethane (1,2 <br /> DCA), and 1,2 dibromoethane (EDB) A summary of laboratory data is listed below <br /> a <br /> 1 1Chevron194275113enodic Mon itonng\QMR1200314003 revised OMR Chev and Arcot doc <br />