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. A S S O C I A T E S I W C <br /> Collected groundwater samples were placed on ice and transported under chain-of-custody to <br /> State-certified Argon Laboratories, Inc , (DHS Certification No 2359) Samples were analyzed <br /> for BTEX by EPA method 8020, TPHg by EPA method modified 8015, and oxygenate fuel <br /> additives, including 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB) by EPA <br /> method 8260 <br /> RESULTS <br /> Laboratory analyses detected petroleum hydrocarbon constituents in the sample collected from <br /> well MW1 The constituent concentrations detected include TPHg (230 pbb), benzene (0 8 ppb), <br /> toluene (0 6 ppb), ethyl benzene (1 0 ppb), and xylenes (1 2 ppb) Groundwater samples <br /> collected from well MW2 contained low levels of TPHg (51 ppb), but contained no detectable <br /> concentrations of BTEX Groundwater samples collected from wells MW3 and the Domestic <br /> Well contained no detectable concentrations of BTEX or TPHg 1,2-DCA was detected in MW1 <br /> and MW3 1n concentrations of 30 ppb and 4 3 ppb, respectively <br /> Analytical results are summarized in Table 1 Laboratory reports and chain-of-custody <br /> documentation are presented in Attachment 2 <br /> CONCLUSIONS <br /> The detected concentrations of petroleum hydrocarbon constituents appear to be generally <br /> consistent with historical data The groundwater gradient varies from historical data, with the <br /> direction of flow shifting northward of historical data <br /> If you should have any questions or comments regarding this report, please contact the undersigned <br /> at your convenience at (209) 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> Jim Kundert I EMA F4I t <br /> Staff Geologist Hf t`,ry G <br /> l' �4a1r 'V <br /> aJ :'YH o in P E <br /> CA Registered Civil Engineer No 47410 ' <br /> . cc Ms Lolly Bozzano <br /> Ms Leanne Scannavino <br /> Mr Jim Barton, RWQCB <br /> W 1148851reports\1 gtr2003 doc 3 <br />