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Fourth Quarter 1997 Monitoring and Sampling Report 2 <br /> The Southland Corporation,Store#20304,455 Grant lane Rd.,TTq,CA February 12,1998 <br /> the well was purged dry. f=ield measurements of temperature,conductivity,dissolved oxygen (D.O.),and <br /> +•w pH were recorded during well purging_ The groundwater samples were collected using disposable bailers <br /> and placed in analysis-specific sample containers with analysis-specific preservatives. The samples were <br /> then sealed and labeled with the job identification number,the sample number,date,time,and type of <br /> laboratory analysis required. The samples were stored on ice in an insulated container and transported <br /> under chain-of-custody manifest to West Analytical Laboratory,in Davis,California. The groundwater <br /> samples were analyzed for BTEX, MTBE and TPH-G using Environmental Protection Agency(EPA) <br /> methods 8020/modified 8015,and for oxygenates:MTBE,TBA,DIPE, ETRE,and TAME using EPA method <br /> 8260. Groundwater purged during the fourth quarter monitoring and sampling event was pumped through <br /> the groundwater extraction system. <br /> V <br /> Dissolved benzene and TPH-G were detected in groundwater samples from monitoring wells MW-8,MW-9 <br /> and MW-10 with highest concentrations reported in MW-10 at 8,200 micrograms per liter(pg/L)and 32,000 <br /> pg/L,respectively(Figure 3). Using EPA method 8260,dissolved MTBE was reported in well MW-9 at 8.2 <br /> pg/L. Highest dissolved TBA concentration was reported in well MW-9 at 760 pg/L.DIPE, ETRE,and <br /> TAME were not detected in any wells. Analytical results from the groundwater samples collected on <br /> November 11, 1997 are presented in Table 1,and historical analytical results are summarized in Table 1A. <br /> The laboratory analytical reports and the chain-of-custody records for this sampling event are included in <br /> �. Attachment 4. <br /> Please contact Fluor Daniel GTI's Martinez office at(510)370-3990 if you have any questions or comments <br /> 4"� regarding this report. <br /> Sincerely, <br /> Fluor Daniel GTI,Inc. Fluor Daniel GTI,Inc. <br /> Submitted by: Approved By: <br /> Bob Butler Shelby Lathrop <br /> Staff Geologist Project Manager <br /> .}ssff �C � 5[cI L� Vr <br /> I,N u�j 1 <br /> °Zd K.Simonis, R.G. <br /> No.4412 enior Geologist <br /> ,st, <br /> c: Ms. Elizabeth Thayer,California Regia "51ity Control Board-CVR <br /> Ms.Mary Meays-San Joaquin County Pu is ealth Services <br /> Attachments <br /> 1. Figures <br /> 2. Table 1 <br /> 3. Field Data Sheets <br /> 4. Laboratory Analysis Report <br /> FLUOR DANIEL GTI <br />