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SECOR f Wv✓w secor COm <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> ho�� LI LI {fj r f1C1 11�UD <br /> riiVCORPORATED Ranc <br /> TEL 9168610400vaSCA95670 <br /> • IN O V C 3 200? <br /> October 30, 2003 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Ms Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor E <br /> Stockton, CA 95202 <br /> RE Third 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 5-2133 <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 third quarter <br /> 2003 groundwater monitoring event at the above referenced sites <br /> COMPLETED ACTIVITIES —Third Quarter 2003 <br /> • Performed coordinated quarterly groundwater monitoring and sampling <br /> o Prepared and submitted quarterly groundwater monitoring report <br /> • Operated and maintained air sparge (AS) systems (CHEVRON and ARCO) <br /> PLANNED ACTIVITIES -- Fourth Quarter 2003 <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 /> • Collect a groundwater confirmation sample from Municipal well # 10 <br /> DISCUSSION (CHEVRON) <br /> Nine Chevron wells and Municipal well # 10 were sampled on September 24, 2003 by Gettler Ryan, <br /> Inc (G-R), in conjunction with groundwater monitoring at the adjacent ARCO service station 2113 <br /> Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), <br /> benzene, toluene, ethylbenzene, and xylenes (BTEX), and the fuel oxygenates methyl tertiary butyl <br /> ether (MtBE), ethyl-tertiary-butyl-ether (EtBE), di-isopropyl ether (DIPE), tertiary-amyl-methyl-ether <br /> (TAME), tertiary-butyl-alcohol (TBA), 1,2 dichloroethane (1,2 DCA), and 1,2 dibromoethane (EDB) <br /> A summary of laboratory data is listed below <br /> 3 <br /> i <br /> 1 <br /> i <br /> 11Chevron1942751Periodic Mon itoring\QMR\200313003 revised QMR Chev and Arcot doc <br />