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21 October 2004 AGE-NC Project No 02-0964 ' Page 3 of 4 ' detected at a concentration of 160 µg/1, toluene was detected at a concentration of 24 µg/1, and ethylbenzene and total xylenes were detected at concentrations of 1,300 µg/1 and 2,676 µg/l, respectively (Table 2) TAME and 1,2-DCA were also detected in MW-1 at concentrations of ' 7 2 4g/1 and 7 6 µg/1, respectively (Table 3) No other petroleum hydrocarbons were detected in ground water samples from well MW-1 ' Analytical results of ground water samples are summarized in Tables 2 and 3 The laboratory report (CTEL Project No CT214-0407174),quality assurance/quality control report and chain of custody form are included in Appendix C 1 4.0. SUMMARY AND CONCLUSIONS ' Based on data collected on the site, AGE concludes ' 0 Depth to ground water at the site averaged approximately 29 94 feet bsg on 23 July 2004 • Ground water elevation in the monitored area ranged from 17 87 feet to 19 10 feet below MSL Flow direction was inferred to be toward the east-northeast under a gradient of approximately 0 010 ft/ft ' a In well MW-1, TPH-g, BTEX, TAME, and 1,2-DCA were detected at concentrations of 27,000 µg/l, 160 µg/1 (benzene), 24 µg/1 (toluene), 1,300 µg/1 (ethylbenzene), 2,676 µg/1 (total xylenes), 7 2 µg/1, and 7 6 µg/1, respectively The concentrations of benzene, ' ethylbenzene,and total xylenes were significantly above the DHS's Maximum Contaminant Levels established for these compounds in drinking water • The concentrations of toluene in well MW-1 (24 µg/1)was less than California's Maximum ' Contaminant Level of 150 µg/1 • The extents of petroleum hydrocarbon and BTEX compounds at the site have not yet been defined ' 5.0. RECOMMENDATIONS Based on the findings recounted in this report, AGE recommends • Continued quarterly monitoring of the site, the next monitoring event should take place in ' October 2004 ' Advanced CeoEnvironmental,Inc I