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•+ `I SECOI W�..( www.secor,com <br /> INTERN7�rIONAL 3017 Kilgore Road,Suite 100 <br /> S <br /> INCORPORATED Rancho Cordova,CA 95670 <br /> J 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> Ir-0-12 IF C F�W E_�:'0 <br /> October 20, 2006 OCT 2 5 2006 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> RE: Groundwater Monitoring and Sampling Analyte Reduction Request <br /> 7-Eleven Store #32262 <br /> 2360 West Grant Line Road <br /> Tracy, California <br /> SECOR Project No.: 77EL.32262.06.0707 <br /> Dear Ms. Duncan: <br /> This letter was prepared by SECOR International Incorporated (SECOR) on behalf of 7- <br /> Eleven requesting a reduction in groundwater analysis of groundwater samples collected at <br /> 7-Eleven Store #32262 located at 2360 West Grant Line Road, Tracy, California (Figures 1 <br /> and 2). <br /> SECOR requests the removal of 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane <br /> (EDB) from the sampling profile. Groundwater samples are currently being tested for these <br /> analytes during quarterly groundwater monitoring and sampling for the above-referenced <br /> site. <br /> Groundwater monitoring and sampling at the site has been conducted since the fourth <br /> quarter 2003. 1,2-DCA and EDB have not been detected above laboratory reporting limits <br /> from the initiation of sampling to present day. Historical groundwater analytical results and <br /> monitoring data are summarized in Table 1. <br /> SECOR proposes removing 1,2-DCA and EDB from the sampling profile in the first quarter <br /> 2007. Quarterly analysis of groundwater samples collected from all wells will consist of <br /> total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX), and fuel oxygenates methyl-tert-butyl ether (MtBE), tert-butyl alcohol <br /> (TBA), diisopropyl ether (DIPE), ethyl-tert-butyl ether(EtBE), and tert-amyl-methyl ether <br /> (TAME). <br /> 32262 Analyte Reduction Request <br />