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r �l W�=-dmr}i..'�-' n e. �- v:.s a ....n ..e r1-u --�,. ' , a s ;- -'+-.,dz,F'" +•_ x e, fr a 20 October 2004 AGE-NC Project No 95-0135 Page 4 of 5 r 1 r 3 2 2 HU2 f TPH-g was detected in the water samples from the deep-screened monitoring wells at concentrations "of 1100 µg/1(MWAA),''1,200 µg/I (MW-2A), and 110 µg/1 (MW-3A) BTEX compourids were" '. detected in samples MW-1 A'and MW-2A at maximum concentrations of 400 µg/1 benzene, 23 µg/1 ' t ethylbenzene and 42 6 µg/1 xylenes,"In sample MW-IA In addition, the fuel additive DIPE was detected in sample MW-2A at a concentration of 61 µg/1, TAME was detected in sample MW-1B at a concentration of 8 6 µg/1 No other petroleum hydrocarbons were detected in ground water samples analyzed The analytical I results of groundwater samples are summarized in Table 2 The laboratory report(CTEL Project No 4 CT214-0406008)quality assurance/quality control(QA/QC)reports and chain of custody forms are included in Appendix C 4 0. SUMMARY AND CONCLUSIONS Based upon data collected from the site, AGE concludes Ground water elevations ranged between 14 86 feet and 15 28 feet below MSL in HUI, and between 15 07 feet and 15 30 feet below MSL in HU2 In HUI, the ground water flow direction was Inferred to be southeast under a hydraulic gradient of approximately 0 004 ft/ft, in HU2, the ground water flow direction was Inferred to be southeast under a hydraulic W gradient of approximately 0 002 ftlff • The highest concentrations of petroleum hydrocarbon compounds were detected in HU2 ground water TPH-g was detected in HU2 at a maximum concentration of 1,200µg/1,BTEX fcompounds were detected at maximum concentrations 400 µg/1 benzene, 23 µg/1 ethylbenzene, and 42 6 µg/1 xylenes, and the fuel additives DIPE and TAME were detected at maximum concentrations of 61 µg/1 and 8 6 µg/l, respectively MTBE was detected only ' m one HUI sample (MW-2B) at a concentration of 15 µg/1 „ Benzene'and MTBE concentrations exceed the State of California'maximum contaminant I levels (MCLs) established for contaminants in drinking water i 3 The lateral and,venccal extent of dissolved hydrocarbons is not defined to the north, south, and east of wells MW-1 and MW-2"` i y r Advanced GeoEnvironmental,Inc