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SECOR vvww.secor.corn <br /> INTERNATIONAL 30'17 Kilgore;Road,Suite 100 <br /> INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916.861-0430 FAX <br /> October 17, 2006 <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE: Groundwater Monitoring and Sampling Analyte Reduction Request <br /> 7-Eleven Store #14117 <br /> 2725-Country Club Road <br /> Stockton, California <br /> SECOR Project No.: 77EL.14117.06.0707 <br /> Dear Mr. lnfurna: <br /> This letter was prepared by SECOR International Incorporated (SECOR) on behalf of 7- <br /> Elevenrequesting a reduction.in groundwater analysis of groundwater samples collected at <br /> 7-Eleven Store #14117 located at 2725 Country Club Boulevard, Stockton, California <br /> (Figures 1 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 third <br /> quarter 1999. 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 peofile,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 tent-amyl-methyl ether. <br /> (TAME). SAN JOAQUIN COUN'f'Y <br /> ENYMONMENTAL W&TH <br /> 30E WESER AVE THINCI PLOM <br /> STQCKTON CA amppmved , t <br /> so therew In PAIIIIIIIIIIIIIIft <br /> t... <br /> C3 :I1saprote1 Ia . <br /> Remark <br /> Date <br /> 14117 Analyte Reduction Request Approval extends a*to that vjh&W dWMR1 Mld <br /> =reon and does not authorize or approva any OmINlon or <br /> —1.Yirenrents of state laws or local ordinances. <br />