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' 18 April 2001 AGE-NC Project No. 98-0520 Page 3 of 4 1 Various BTEX compounds were detected in all of the water samples analyzed.Benzene was detected ' in samples from MW-2 (0.7 µg/1) and MW-3 (1.2 µg/1). Toluene was detected in samples from all wells except MW-4;the maximum toluene concentration was found in the sample from MW-5 (5.6 µg11).The maximum•ethylbenzene and xylene concentrations were detected in the sample from MW- 1 5 at 900 µg/1 and 1,000 µg/l; respectively. TBA was detected by EPA Method 8260B in three of the ground water samples(MW-3,MW-4 and ' MW-5) at concentrations ranging from 14 µg/1 in MW-5 to 170 µg/i in MW-3. MTBE,EDB and 1,2-DCA were not detected above laboratory reporting limits in the ground water, ' samples collected. Analytical results of ground water 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 17.4 feet bsg on 16 March 2001. ' 0 On 16 March 2001 the ground water elevation at the site averaged.approximately 19.3 feet above mean sea level, with a net flow towards the northwest under an average gradient of 0.0008 ft/ft. t TPH-g concentration increased in groundwater samples from MW-1 through MW-4 from the previous quarter monitoring; TPH-g concentration in the sample from MW-5 (former ' UST area) remained the same. • 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 1 hydrocarbon-impact to ground water. • TBA was detected in three of the five ground water monitoring wells at concentrations as high as 170 µg/l. ' TI5,0, RECOMMENDATIONS ' Based upon data collected from the site, AGE-recommends: ' Advanced GeoEnvironmental,Inc.