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t07 November 2002 <br /> . AGE-NC Project No 98-0497 <br /> ' Page 3 of 4 <br /> ' • TPH-g and TPH-d were detected in well MW-1 at concentration of 410 micrograms per liter <br /> (µg/1) and 93,000µg/1,respectively The laboratory report noted that strongly-aged gasoline <br /> or diesel compounds were significant <br /> ' • BTEX compounds were not detected in the five ground water samples analyzed <br /> • Fuel additives were not detected in the five ground water samples analyzed -SonY��� k (ud <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in <br /> ' Table 2 Copies of the laboratory reports for the quarterly monitoring event (MAI Lab IDs <br /> 0209363-001 through 0209363-005),QA/QC reports and chain-of-custody form are in Appendix B <br /> ' 4.0. SUMMARY AND CONCLUSIONS W- <br /> ' The findings of the 23 September 2002 ground water monitoring event include the following <br /> • Measured ground water elevation was approximately 40 6 feet below MSL,and was within <br /> ' the screened interval of each monitoring well Ground water flow direction was generally <br /> toward the northeast with an average gradient of 0 004 foot/foot Historically,flow direction <br /> at the site has been toward the east or has had no observable gradient <br /> ' • Contamination by TPH-g and TPH-d was encountered in the ground water sample collected <br /> and analyzed from MW-1 Concentrations of TPH-g appeared to have stabilized since the <br /> March 2001 monitoring event Detected concentrations of TPH-d in samples collected from <br />' MW-1 have flucuated significantly during the past two monitoring events TPH-g and TPH-d <br /> were not detected in wells MW-2 through MW-5 <br />' • BTEX compounds and fuel additives were not detected in any of the ground water samples <br /> analyzed tii,E,3�- <br />' • The hydrocarbon-impacted groundwater plume appears to be limited to the area immediately <br /> surrounding MW-1 The inferred areal extent of hydrocarbon-impacted ground water is <br /> illustrated in Figure 4 <br /> 5 0. RECOMMENDATIONS <br />' Based on the results of this andrevious investigations, A <br /> p g GE recommends continued quarterly <br />' monitoring of the groundwater monitoring network The next monitoring event should be scheduled <br /> for December 2002 With favorable results, the site should be submitted for closure consideration <br />' Advanced GeoEnvironmental,Inc <br />