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' 20 December 2001 <br /> AGE-NC Project No 95-0497 <br />' Page 3 of 4 <br />' 41 GROUND WATER ELEVATION AND GRADIENT <br /> Ground water elevations were determined by subtracting the measured depths-to-water from the <br />' surveyed casing elevations The ground water elevation on 30 November 2001 was approximately <br /> 37 4 feet below mean sea level(msl),with the average depth to water at 62 3 feet below casing tops <br /> The average ground water elevation in the three wells had decreased 12 feet since the last ground <br />' water monitoring event Ground water is within the screened Interval of each monitoring well <br /> The ground water gradient for the November 2001 monitoring event was inferred to be 0 0004 <br />' feet/feet with a flow direction toward the east-southeast <br /> 4 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br />' The analytical results from the 30 November 2001 ground water sampling event are as follows <br /> • TPH-g was detected in MW-1 at a concentration of 580 micrograms per liter (gg/l) No <br /> lie BTEX compounds were detected in the ground water samples analyzed The laboratory <br /> report notes the presence of a sheen iii the sample from MW-1 and that the chromatograph <br /> indicates strongly aged gasoline or diesel compounds are significant <br />' • TPH-d was detected at a concentration 12,000 µg/1 in the sample from well MW-1 The <br /> laboratory report notes the presence of a sheen in the sample from MW-1 <br />' • MTBE was not detected in the three ground water samples collected <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 84760 <br /> through 84762), QA/QC reports and chain-of-custody form are in Appendix B <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> The findings of the 30 November 2001 ground water monitoring event include the following <br /> ' Contamination by TPH-g and TPH-d was encountered in groundwater samples collected and <br /> analyzed from MW-I Concentrations of TPH-g appear to have stabilized since the March <br /> 2001 monitoring event Concentrations of TPH-d continue to significantly decline <br /> ' Advanced GcoEnvironmentai,Inc <br /> 1 <br />