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r , r .i 23 Decembe'r'12004 i� AGE-NC Project No. 95-0106 Page=3 of 4 '" 'MWS, MW-6 (upper), MW-6 (lower), or MW-7. Analytical results of ground water samples are summarized' in Table 2. The laboratory report (CTEL Project .No: CT214'0409157), .quality _ '± assurance/quality control(QA/QC)reports and chain of custody forms are included in Appendix'C. ; Documents confirming the upload'of laboratory electronic deliverable format(EDF)files and depth ' to water measurements to GeoTracker are included in Appendix D. 4 4.0.. SUMMARY AND CONCLUS11ONS` The following conclusions were drawn from the results ofthe,site investigation: . r • ` The.,ground :water flow. direction was generally northward on 23 September 2004;:at , ' gradients ranging between 0.003.foo't/foot 'arid 0.007 foot/foot. Ground water'elevations ; 'decreased slightly but continue to-`flow in a northerly direction. • TPH-g was detected in'ground water samples from monitoring well MW-4, located down- gradient off-,site from the former UST excavation, and in well MW-1 located just north of .; the former UST area.-Concentrations of dissolved TPH-g decreased this quarter in samples ' . from wells MW-1 and MW-4. • BTEX'compounds were detected in the water samples collected from MW-1 and MW-4. The concentrations of benzene in the'ground'water samples.,collected'from wells MW-1 and ' MW,4 exceeds the State of California Maximum Containiriant Level (MCL) for benzene .in drinking water. • MTBE .was not detected.inthe water samples collected from the site.for the second consecutive quarter. , '1'2-DCA was not detected this'quarter in.the ground water samples collected: ' 5.0. RECOMMENDATIONS Based p g AGE recomme q } ' on�this and� revious site investigations,-AGE " nds continued` uarterly monitoring of the well network. The'fourth quarter monitoring event was performed on 16 December 2004; i 11 ' { Advanced GeoEnvironmental,Inc.