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' 01 May 2003 • AGE-NC Project No 97-0326 ' Page 3 of 4 ' BTEX compounds were detected in all of the wells sampled Benzene was detected in samples from MW1, MW2 and MW3 at concentrations of 1,500 dig/l, 26,000 µg/l and 16,000 µg/l, respectively Toluene, ethylbenzene and xylenes were detected at maximum concentrations of 29,000 gg/l, ' 8,000 gg/l and 45,000 gg/l, respectively from well MW1 MTBE was detected in the ground water samples from MWl, MW2 and MW3, at concentrations of ' 75 µg11, 7 6 gg/l and 47 gg/l, respectively 1,2-DCA was detected in the ground water sample collected from MW3 at a concentration of 12 gg/1 No other fuel additives were detected at or above laboratory detection limits in the samples analyzed ' Analytical results of the groundwater samples for the January 2003 monitoring event are summarized on Table 2 The laboratory report(CTEL Protect No CT214-0301028),QA/QC report and chain-of- custody form are included in Appendix C ' 4.0. SUMMARY AND CONCLUSIONS ' Based on the data collected from the site, AGE finds The inferred ground water flow direction at the site has been dominantly toward the south- southeast during the thirteen monitoring events conducted to date, although the historical ground water flow direction at the adjacent site to the east(USA),and at the Morita Brothers site at the southeast comer of East Char-ter Way and Grant Street, has been toward the east ' or northeast • High concentrations of petroleum hydrocarbons were detected in ground water samples collected from all three monitoring wells on the site (see Figure 3) BTEX compounds and ' MTBE are at concentrations exceeding California's Maximum Contaminant Levels for these products in drinking water 1,2-DCA was detected in well MW3 for the first time in the past ' seven sampling events • Neither the vertical nor horizontal extent of impacted groundwater has been delineated at the site 1 ' 5.0. RECO W ENDA'nONS Based on the findings of this investigation, AGE recommends continuation of the quarterly ground ' water monitoring program, as required by the E1 D 1 Advanced GeoEnvlronmental,Inc 1