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I T <br /> SECOR www secor corn <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 1 916-861.0400 TEL <br /> I 916-861-0430 vrx <br /> July 30, 2004 <br /> Ms Lori Duncan <br /> San Joaquin County Environmental Health Department AUG 0 3 2004 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 ENVIRONMENI HEALTH <br /> RE Second Quarter 2004 Quarterly Progress Report PERMIT/SERVICES <br /> Commingled Plume Site #35 <br /> Chevron Service Station <br /> 2905 Benjamin Holt Drive <br /> Stockton, California <br /> SECOR Project No 77CH 94275 06 0670 <br /> and <br /> Arco Service Station <br /> 2908 Benjamin Holt Drive <br /> Stockton, California <br /> SECOR Project No 77BP 52133 4 0336 <br /> Dear Ms Duncan <br /> SECOR International Incorporated (SECOR) is providing this report to summarize the second <br /> quarter 2004 (2Q04) groundwater monitoring event and the 2Q04 remedial activities at the above <br /> referenced commingled plume site (Figure 1) <br /> COMPLETED ACTIVITIES — Second 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 —Third 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 <br /> GROUNDWATER MONITORING DISCUSSION <br /> On June 22, 2004, Gettler-Ryan conducted 2Q04 groundwater monitoring and sampling for <br /> CHEVRON service station 9-4275, in conjunction with SECOR performing groundwater monitoring <br /> and sampling for Arco service station 2133 on June 22 and 29, 2004 Nine monitoring wells were <br /> sampled at Chevron service station 9-4275, and four monitoring wells were sampled at Arco service <br /> station 2133 For liability reasons, the city of Stockton Municipal District would not operate Municipal <br /> well # 10, and allow SECOR to collect a sample during 2Q04 Groundwater samples were analyzed <br /> . for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes <br /> L� <br /> (BTEX), and the fuel oxygenates methyl tertiary butyl ether (MtBE), ethyl-tertiary-butyl-ether (EtBE), <br /> 11Chevron1942MPeriodic Monitonng\Q M 81200412004 doc <br />