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I 20 July 2001 AGE-NC Project No 97-0326 ' Page 3 of 4 ' samples from MW1, MW2 and MW3 at concentrations of 1,300 µg11, 8,500 µg/1 and 20,000 µg/l, respectively Toluene, ethylbenzene and xylenes were detected at concentrations as lugh as 25,000 µg/l, 4,700 4g/1 and 24,000 µg11, respectively(MW3) ' MTBE was detected in ground water samples from MW-1 and MW-3,the highest concentration was , 320 4g/1 in MW-1 No other oxygenated compounds were detected in the samples analyzed ' 1,2 DCA was detected for the first time in the water sample from MW-1, at a concentration of ' 21 µg/1 Analytical results of the ground water samples for the second quarter - 2001 monitoring event are summarized on Table 2 The laboratory report (MAI Laboratory ID 70397-70399), QA/QC report ' and chain-of-custody form are included in Appendix B ' 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 toward the south during the six 1 monitoring events conducted, although the historical ground water flow direction at the adjacent site to the east(USA), and at the Morita Brothers site at the southeast corner of East Charter Way acid Grant Street, has been toward the cast or northeast ' • High concentrations of petroleum hydrocarbons were detected in ground water samples collected from all three monitoring wells on the site • Neither the vertical nor horizontal extent of impacted ground water has been delineated at the site 1 5.0. RECOMMENDATIONS Based on the findings of this investigation, AGE recommends • Continuation of quarterly ground water monitoring, as required by the PHS-EHD • Installation of additional CPT or soil borings to delineate the vertical and horizontal extent of impacted ground water Advanced GeoEnvlronmental,Inc 1