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15 June 1999 <br /> J'. AGE Project No. 95-0118 <br /> Page 3 of 4 <br /> The water samples collected from MW-1, MW-4, MW-5 and MW-6 did not contain detectable <br /> concentrations of TPH-g or BTEX compounds. Analytical results of ground water samples are <br /> summarized in Table 2. <br /> The laboratory report (MAI Lab ID 10191 to 10198), Quality Assurance and QualityControl <br /> (QA/QC) report and a chain-of-custody form are included as Appendix B. <br /> r> 4.0. CONCLUSIONS <br /> Based upon results of ground water monitoring well sampling,.AGE concludes: <br /> =! The ground water elevation has remained at approximately thirty one feet below surface <br /> grade. This depth to ground water allows for the monitoring wells on the site to yield <br /> ! ` representative ground water samples from the top of the water table where the highest <br /> concentrations of dissolved hydrocarbons are likely to reside. <br /> The hydrocarbon concentrations in the dissolved plume have increased in monitoring well <br /> MW-2 and air-sparging well IAS-2 since the previous monitoring event and increased <br /> concentration in the sample from well MW-3. <br /> ` MTBE has been present in ground water samples collected from well MW-2. <br /> 5.0. RECOMMENDATIONS <br /> 'd Based upon the results of the investigation, AGE recommendations: <br /> Continue quarterly monitoring of ground water well, with the next eventscheduled for late <br /> .j July 1999. <br /> • Initiation of in-situ air sparging (IAS) combined. with soil vapor extraction (SVE) <br /> remediation on the site. <br /> ,i <br /> F. <br /> Advanced GeoEnvironmental,Inc. <br />