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.f <br /> 27 May 1997 <br /> AGE Project No. 95-0118 <br /> Page 3 of 4 <br /> MTBE was detected only in wells MW-2 and VW-2 at concentration of.13 ppb and 11 ppb, <br /> respectively. Analytical results of ground water samples are summarized in Table 2 - Analytical <br /> Results of Ground Water Samples. The laboratory report (MAI Lab ID 86332 to 86339), QA/QC <br /> ' report and chain-of-custody are included as Appendix B. <br /> 4.0. CONCLUSIONS AND RECOMMENDATIONS <br /> 4.1. CONCLUSIONS <br /> Based upon results of ground water monitoring well sampling, AGE concludes: <br /> The relative ground water elevation has risen nearly 2 feet during the last quarter. <br /> • The hydrocarbon concentrations in the dissolved plume have increased in monitoring wells <br /> MW-2 and MW-3 . Hydrocarbon concentrations have increased significantly in air-sparging <br /> well VW-2 since the previous monitoring event. <br /> The concentrations of BTE&X compounds have increased MW-2 and MW-3 over the last <br /> quarter. <br /> • MTBE has been detected and confirmed in wells MW-2 and VW-2. <br /> F;7 4.2. RECOMMENDATIONS <br /> Based upon the results of the investigation, AGE recommendations: <br /> -� The next quarterly ground water sampling event should be scheduled for May 1998. <br /> • Feasibility testing, reported in the Corrective Action Plan, has indicated that in-situ air <br /> .'_-_ sparging (IAS) combined with soil vapor extraction would be a cost-effective remediation <br /> method for this site. We recommend the installation of an SVE/IAS system, pending <br /> approval of cost recovery from the California Water Resources Control Board. <br /> 5.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities. The findings were based upon <br /> i Advanced GeoEnvironmental,Inc. <br />