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05 April 1999 <br /> AGE Project No. 95-0118 <br /> Page 3 of 4 <br /> The laboratory report (MAI Lab ID 02344 to 02351), Quality Assurance and Quality Control <br /> (QA/QC) report and a chain-of-custody form are included as Appendix B. <br /> r <br /> 4.0. CONCLUSIONS <br /> Based upon results of ground water monitoring well sampling, AGE concludes: <br /> • The hydrocarbon concentrations in the dissolved plume have decreased in monitoring wells <br /> MW-2, MW-3 and in air-sparging well IAS-2 since the previous monitoring event. <br /> • MTBE has been present in ground water samples collected from well MW-2. <br /> f • 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 /> i concentrations of dissolved hydrocarbons are likely to reside. <br /> lr y <br /> 5.0. RECOMMENDATIONS <br /> Based upon the results'of the investigation, AGE recommendations: <br /> • Continue quarterly monitoring of groundwater well, with the next event scheduled for late <br /> April 1999. <br /> • Initiation of in-situ air sparging (IAS) combined with soil vapor extraction (SVE) <br /> remediation on the site. <br /> Advanced GeoEnviron mental,Inc. <br />