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SECOR www secorc,) <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAx <br /> w <br /> April 30, 2004 <br /> Ms tori Duncan NICRAD <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor Of 0 <br /> Stockton, CA 95202 9a AWNT HLi$ <br /> RE First Quarter 2004 Quarterly Progress Report �$ <br /> Chevron Service Station 9-4275 �11 �� -Z_ <br /> 2905 Benjamin Holt Drive 1"� Qn <br /> Stockton, California <br /> SECOR Project No 77CH 94275 04 0670 <br /> and <br /> Arco Service Station 2133 <br /> 2908 Benjamin Holt Drive �� `3�-Ze)Gy <br /> Stockton, California l <br /> SECOR Project No 77BP 521 04 0336 <br /> I Dear Ms Duncan <br /> SECOR International Incorporated (SECOR) Is providing this report to summarize the first quarter <br /> 2004 (1 Q04) groundwater monitoring event and the 1 Q04 remedial activities at the above referenced <br /> commingled plume site (Figure 1) <br /> COMPLETED ACTIVITIES — First 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 — Second 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 (CHEVRON) <br /> On March 23, 2004, Gettler-Ryan conducted 1Q04 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 Nine monitoring wells were sampled For liability <br /> reasons, the city of Stockton Municipal District would not operate Municipal well # 10, and allow <br /> SECOR to collect a sample during 1Q04 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 dichloroethane (1,2 <br /> DCA), and 1,2 dibromoethane (EDB) A summary of laboratory data Is listed below <br /> 1Chevron1942751Periodic Monitonng\QMR1200411 Q04 QPR doc <br />