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I nrl R I31 May 2002 AGE-NC Project No 97-0290 Page 6 of 7 I Analytical results of all water samples collected at the site are summarized In Table 5 The laboratory report (CTEL Lab ID No 0202-100-1 to -6), chain-of-custody forms and quality assurance and quality control (QA/QC) reports are Included In Appendix E 4.0. SUMMARY AND CONCLUSIONS Based on the data collected from the site, AGE finds • During the February 2002 monitoring event,ground water was encountered In the monitoring wells at an average elevation of 2 4 feet above MSL, and was Inferred to have a southwesterly flow direction • The highest concentrations of dissolved petroleum hydrocarbons were detected in samples collected from wells MW-2 and MW-4, however, the concentrations have decreased Isignificantly(by a factor of 3) from the previous quarter • Concentrations of benzene have decreased in wells MW-2 and MW-4 over the past quarter, lie but still remained high at well MW-2 Benzene was detected in wells MW-2 and MW-4 at concentrations exceeding the DHS' maximum contaminant level (MCL) of 1 0 µg/1 • MTBE was detected at the site for the first time, in wells MW-4 (8 3 µg11) and MW-6 ' (97 gg/l) utilizing EPA Method 8021, the concentration in well MW-6 exceeds the DHS' MCL of 13 µg/1 • A total of 230 gallons or 656 kg of gasoline(TPH-g and BTEX)were removed over the first three months of re-Initiation of the SVE system Continued operation of the SVE should result in diminishing recovery, signifying a reduction of the hydrocarbon Impact to soil ' 5.0 RECOMMENDATIONS Based on the findings of the environmental activities recounted in this report, AGE recommends ' 0 Continued monthly monitoring of the SVE/IAS operation, • Continued quarterly well monitoring, the next monitoring event should be scheduled for IMay or June 2002 I Advanced GeoEnvironmental,Inc