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' 09 July 2001 AGE-NC Project No. 98-0520 ' Page 3 of 4 Various BTEX compounds were detected in all of the watersamples analyzed.Benzene was detected 1 in samples from MW-2 (0.94-µg/l) and MW-3 (1.5 µg/1): Toluene was detected in samples from: MW-2,MW-3 and MW-5;the maximum toluene concentration was found in the sample from MW-5, (5.6 µg/1). The nnaximum ethylbenzene and xylene concentrations were detected in the sample from MW-5 at 1,100 µg11 and 1,300 µg/l, respectively. TBA was detected by EPA Method 8260B in ground water samples from MW-2 through MW-5 at concentrations ranging from 23 µg/1 in MW-4 to l 10 µg11 in MW-3. ' MTBE,EDB and 1,2-DCA were not detected above laboratory reporting limits in the groundwater samples collected. ' Analytical results of groundwater samples are summarized on Table 2. The laboratory report(MAI Lab I.D.No. 63396 through 63400) and chain-of custody forms are included in Appendix B. 4.0. SUMMARY AND CONCLUSIONS ' Based upon data collected from the site, AGE concludes: • Depth to ground water at the site averaged approximately 19.4 feet bsg-on 11 June 2001. ' • ground On 11 June 2001 the water elevation'at the site averaged approximately 17.4 feet above mean sea level,with a net flow towards the northwest under an average gradient of 0.0006 ft/ft.. • TPH-g concentration increased in ground water samples from MW-1 through MW-5 from the previous quarter monitoring. • TPH-g and various BTEX compounds were'detected in all-five ground water monitoring wells on-site. Further lateral definition is necessary to determine the horizontal extent of ' hydrocarbon-impact to ground water. • TBA was detected in four of the five groundwater monitoring wells at concentrations as high '• as 110 µg/l. ' 5.0. RECOMMENDATIONS . ' Based upon data collected-frorn the site, AGE recommends: Advanced GeoEnvironmental,Inc. 1