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22 October 2002 <br /> SAGE-NC Project No 97-0326 <br /> Page 3 of 4 <br /> I BTEX compounds were detected in all of the wells sampled Benzene was detected in samples from <br /> MW1, MW2 and MW3 at concentrations of 2,200 gg/l, 11,000 gg/l and 16,000 �ig/l, respectively <br /> Toluene,ethylbenzene and xylenes were detected at concentrations as high as 19,000 gg/l,5,000µg/1 <br /> Iand 36,000 µg/l, respectively(MW3) <br /> MTBE was detected in the ground water samples from MW2 and MW 1,at concentrations of 12 gg/l <br />' and 330 gg/l, respectively by EPA Method 8260B TBA was detected in well MW 1 at a <br /> concentration of 110 [g/l No other oxygenated compounds were detected in the samples analyzed <br />' Analytical results of the ground water samples for the second quarter 2002 monitoring event are <br /> summarized on Table 2 The laboratory report(CTEL Project No CT214-0207159),QA/QC report <br /> and chain-of-custody form are included in Appendix B <br /> I <br /> 4.0. SUMMARY AND CONCLUSIONS <br />' Based on the data collected from the site, AGE finds <br />'. The inferred ground water flow direction at the site has been dominantly toward the south- <br /> southeast during the eleven monitoring events conducted to date, although the historical <br /> ground water flow direction at the adjacent site to the east(USA),and at the Morita Brothers <br />' site at the southeast corner of East Charter Way and Grant Street, has been toward the east <br /> or northeast <br />' • High concentrations of petroleum hydrocarbons were detected in ground water samples <br /> collected from all three monitoring wells on the site(see Figures 3 to 5) BTEX compounds <br /> and MTBE are at concentrations exceeding California's Maximum Contaminant Levels for <br />' these products in drinking water <br /> • TBA was detected in groundwater samples at concentrations above DHS-recommended <br />' drinking water action levels <br /> • Neither the vertical nor horizontal extent of impacted ground water has been delineated at <br /> the site <br /> 1 <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of this investigation, AGE recommends continuation of the quarterly ground <br />' water monitoring program, as required by the EHD <br /> Advanced Geo Environmental,Inc <br /> 1 <br />