ARCHIVED REPORTS_XR0006884- CASE 2

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' 21 May 2002 . AGE-NC Project No 97-0351 Page 3 of 4 32 ANALYTICAL RESULTS OF WATER SAMPLES The results of laboratory analysis of ground water samples collected at the site over the last quarter are as follows • TPH-g was detected in the samples from ground water monitoring wells MW-1 and MW- UST at concentrations of 5,200 micrograms per liter (Rg/l) and 19,000 µg/l • BTEX compounds were detected in the samples from monitoring wells MW-1 and MW-UST ' at maximum concentrations of 770 Rg/l benzene, 82 Rg/l toluene and 160 Rg/l ethylbenzene from sample MW-1 and 1,800 Rg/l total xylenes from sample MW-UST BTEX compounds were not detected in the samples collected from wells MW-2 through MW-5 ' • MTBE was detected in the water sample from wells MW-1, MW-2 and MW-4 by EPA Method 8260 Modified at concentrations of 22 Rg/l, 1 8 Rg/l and 1 9µg11, respectively 1,2-DCA was detected in the water sample collected from well MW-UST at a concentration ' of 3 5 Rg/1 Laboratory results of samples analyzed for petroleum hydrocarbons are summarized in Table 2 and • Table 3 The laboratory reports (MAI Laboratory ID 64502 through 64507), quality assurance and quality control (QA/QC) reports and chain-of-custody form is included in Appendix B ' 4 0 SUMMARY AND CONCLUSIONS Based upon the results of this quarterly monitoring event, AGE concludes • The highest concentrations of dissolved petroleum hydrocarbons were detected in samples ' collected from wells MW-1 and MW-UST, near the former UST location • MTBE was detected in the samples from well MW-1,MW-2 and well MW-4 at the western ' end of the site • 1,2-DCA was detected in the former UST area 5.0. RECOMMENDATIONS ' Based on the results of this investigation, AGE recommends ' Continued quarterly ground water monitoring ' Advanced GeoEnvironmental,Inc 1