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t12 August 2002 <br /> . AGE-NC Project No'95-0103 <br />' Page 9 of 11 <br />' Oxygenated fuel additives-tertiary butyl alcohol(TBA), dl-isopropyl ether(DIPE),MTBE, <br /> ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME)in accordance with <br /> EPA Method 8260B <br /> ' 33 FINDINGS <br /> Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to <br /> tground water was assessed from laboratory analysis of the ground water samples <br /> ' 3 3 1 Ground Water Elevations and Gradient <br /> Depth to ground water measured on 30 May ranged from 11 92 to 14 07 feet below the top of the <br /> well casings The ground water elevations ranged from 6 84(MW-6)to 7 82 feet(MW-4)below sea <br /> level Ground water elevation decreased approximately 0 8 feet between the February and May 2002 <br /> monitoring events (Table 2) <br /> ' The general ground water flow direction was inferred to be southeast, however, the flow radiates <br /> inward between south-southeast north of the site and easterly west of the site The ground water <br /> ' gradient was approximately 0 004 ft/ft The ground water elevation contours are depicted in Figure 4 <br /> ' 3 3 2 Analytical Results of Ground Water Samples <br /> TPH-g was detected in the ground water samples from monitoring wells MW-3,MW-4 and MW-5 <br /> ' at concentrations of 3,200 microgram per liter (µg/1), 13,000 µg/1 and 760 µg/l, respectively <br /> Benzene was detected in the water samples from well MW-4 at a concentration of 3,800 µg/l <br /> ' Toluene was detected in sample MW-3 at a concentration of 2 3 µg/l Ethylbenzene and xylenes <br /> were detected in samples MW-3, MW-4 and MW-5 at maximum concentrations of 310 µg/1 and <br /> 200 µg/1, respectively(MW-4) Fuel additives were not detected in the samples analyzed <br /> ' The analytical results of current and previous monitoring well samples are summarized in Tables 3 <br /> and 4 The laboratory report of the current ground water sampling data(CalTech IDs 0205-165-1 to <br /> ' -5), quality assurance and quality control (QA/QC)data and chain-of-custody form are included in <br /> Appendix F <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />