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1 • 21 November 2001 ' AGE-NC Project No 98-0497 Page 3 of 4 ' 3 1 GROUND WATER ELEVATION AND GRADIENT Ground water elevations were determined by subtracting the measured depths-to-water from the surveyed casing elevations The groundwater elevation on 30 August 2001 was approximately 36 2 feet below mean sea level(ml), with the average depth to water at 61 1 feet below casing tops The average ground water elevation in the three wells had decreased 3 2 feet since the Iast ground water monitoring event Ground water is within the screened interval of each monitoring well The ground water gradient for the August 2001 monitoring event was inferred to be 0 003 feet/feet with a flow direction toward the northeast 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES The analytical results from the 30 August 2001 ground water sampling event are as follows TPH-g was detected in MW-I at a concentration of 630 micrograms per liter (µg/1) No BTEX compounds were detected in the ground water samples analyzed The laboratory report notes the presence of a sheen in the sample from MW-1 ' + TPH-d was detected at a concentration 27,000 gg/1 in the sample from well MW-1 The laboratory report notes the presence of a sheen in the sample from MW-1 + MTBE was not detected in the three ground water samples collected Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in Tables 2 and 3 Copies of the laboratory reports for the quarterly monitoring event (MAI Lab IDs 76701 through 76703), QA/QC reports and chain-of-custody form are in Appendix B 4.4 SUMMARY AND CONCLUSIONS ' The findings of the 30 August 2001 groundwater monitoring event include the following + Contamination by TPH-g and TPH-d was encountered in groundwater samples collected and analyzed from MW-1 Concentrations of TPH-g and TPH-d appear to have stabilized since the March 2001 monitoring event 1 Advanced GeoEnviironmental,Inc