ARCHIVED REPORTS_XR0006889- CASE 2

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' 04 June 1999 AGE-NC Project No 97-0351 Page 3 of 4 are shown in Figure 3 ' 3 2 HYDROCARBON-IMPACTED GROUND WATER The results of laboratory analysis of ground water samples collected at the site over the last quarter are as follows • TPH-g and benzene were detected in the sample from ground water monitoring well MW-1 ' at concentrations of 4,800 micrograms per liter (µg/1) and 420 µg/l, respectively • Toluene, ethylbenzene and xylenes were also detected in the sample from monitoring well ' MW-1 at concentrations of 51µg/1, 100 µg/l and 280 µg/1,respectively • TPH-d was detected in the samples from ground water monitoring wells MW-1 and MW-2 at concentrations of 1,500 µg/l and 97 µg/1, respectively The other ground water samples ' were not analyzed for TPH-d • MTBE and ETBE were detected in the water sample from well MW-4 by EPA Method 8260M at concentrations of 15 µg/1 and 11 ug/l, respectively ' Laboratory results of samples analyzed for petroleum hydrocarbons are summarized in Table 2 and Table 3 The laboratory reports (MAI Laboratory ID 04239 through 04244), 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 greatest concentrations of dissolved petroleum hydrocarbons were detected In samples collected from well MW-1, near the former western UST location Petroleum hydrocarbons ' were not detected in samples from any of the other wells on the site Fuel additives were detected in the sample from well MW-4 • Diesel-impacted ground water was present in the southwest portion of the site It may be that ' the origin of the TPH-d was the petroleum transfer station formerly on the property west of the site Advanced GcoEnvironmenlal,Inc l� ,