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P <br /> SECOR wwwsecor.com <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova,CA 95670 <br /> 916$61-0400 TEL <br /> t 916-661-0430 FAX <br /> I <br /> November 10, 2004 it li E'IE( /]fit_- D <br /> NOV 1 8 2004 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department E VIR(}N /SEI ICESTH <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, CA 95202 <br /> RE: Third Quarter 2004 Quarterly Progress Report <br /> Commingled Plume Site#35 <br /> Chevron Service Station No. 9 <br /> 2905 Benjamin Holt Drive <br /> Stockton, California <br /> SECOR Project No.: 77CH.94275.06.0670 <br /> and <br /> Arco Service Station No. 2133 <br /> 2908 Benjamin Holt Drive <br /> Stockton, California <br /> SECOR Project No.: 7713 .52133.04.0336 <br /> Dear Ms. Duncan: <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the third quarter <br /> 2004 (3Q04) groundwater monitoring event and the 3Q04 remedial activities at the above referenced <br /> commingled plume site (Figure 1). <br /> COMPLETED ACTIVITIES —Third Quarter 2004 <br /> Performed coordinated quarterly groundwater monitoring and sampling. <br /> • Prepared and submitted quarterly groundwater monitoring report. <br /> • Operated and maintained air sparge (AS) systems (CHEVRON and ARCO). <br /> PLANNED ACTIVITIES — Forth Quarter 2004 <br /> • 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 /> • Prepare a corrective action plan for the commingled plume site once a letter is received from <br /> San Joaquin County Environmental Health Division (SJCEHD). <br /> GROUNDWATER MONITORING DISCUSSION <br /> On September 21, 2004, Gettler-Ryan, Inc. (GRI) conducted 3Q04 groundwater monitoring and <br /> sampling for CHEVRON service station 9-4275, in conjunction with SECOR performing groundwater <br /> monitoring and sampling for ARCO service station 2133 on September 21, 2004. Eight monitoring <br /> wells were sampled at CHEVRON service station 9-4275, and thirteen monitoring wells were <br /> sampled at ARCO service station 2133. For liability reasons, the City of Stockton Municipal District <br /> would not operate Municipal well #10, and allow SECOR to collect a sample during 3Q04. <br /> 1:1Chevron1942751Period1c Monitoring\Q M R1200413Q04.doc <br />