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' 13 July 1999 <br /> •� AGE-NC Project No. 95-0142 <br /> Page 3 of 4 <br /> 1 , <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples collected from wells VW-I through VW-4 at concentrations ranging <br /> from 81 micrograms per liter-(µg/1) to 160,000 µg/1 TPH-g was detected in well MW-6 at a <br />' concentration of 38,000 ,ug/l, respectively <br /> BTEX compounds were detected in all the samples collected from the monitoring wells except MW- <br />' 4 and MW-5 BTEX compounds were detected in samples from each vapor well at concentrations <br /> as high as 36,000 µg/1 (toluene, VW-1). Benzene concentrations ranged from 19 ,ug/l (VW-4) to <br /> 21,000µg/1(VW-1) BTEX compounds were detected in the sample from MW-6 at concentrations <br />' of 2,300 1.zg/1 benzene, 800 µg/1 toluene, 1,400 µg/1 ethylbenzene and 6,200µg/1 xylene <br /> MTBE was the only oxygenated compound detected in water samples collected from the site MTBE <br />' was detected by EPA method 8260 Modified in the ground water samples collected from wells MW- <br /> 5, MW-6, VW-1, VW-2, VW-3 and VW4 at concentrations of 1 7µg/l, 33 ug/l, 500µg/1, 5 1 ug/l, <br />' 66 µg11, 6 3 ug/l, respectively <br /> • Analytical results for the ground water samples analyzed by EPA Methods 8015 Modified and 8020 <br /> are summarized in Table 2 Analytical results for the ground water samples as analyzed by EPA <br /> Method 8260 Modified are summarized in Table 3 The laboratory report (MAI Laboratory I D <br /> Nos 14167 through 14173), quality assurance and quality control (QA/QC) report and <br /> chain-of-custody form are included in Appendix B <br />' 4.0. CONCLUSIONS ` <br />' Based on data collected from the site, AGE concludes <br /> • Ground water flow direction varied generally toward the east to northeast <br />' a Ground water levels were above the screened,intervals of ground water morutonng wells <br /> MW-1, MW-2, MW-3, these wells may not be adequate to characterize the shallow <br /> dissolved-phase hydrocarbon plume <br />' 0 Detectable concentrations of hydrocarbons were not present in samples collected from the <br /> down gradient wells MW-4 and MW-5,although MTBE was detected in the sample MW-5 <br />' a The highest concentration of dissolved petroleum hydrocarbons continues to be in the area <br /> of the documented release (vapor well VW-1), located immediately adjacent to the former <br />' TK 1-90 UST <br />' Advanced GeoEnvironmenta4 Inc <br /> I <br />