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I 13 October 1997 AGE Project No. 95-0118 Page 3 of 4 Analytical results of ground water samples are summarized in Table 2-Analytical Results of Ground f Water=Samples. The laboratory report(MAI Lab ID 79475 to.79478), QA/QC report and chain-of- custody are included as Appendix B. 4.0. CONCLUSIONS AND RECOMMENDATIONS 4.1. CONCLUSIONS Based upon results of ground water monitoring well sampling, AGE concludes the following: • The relative ground water elevation has decreased an average 2.5 feet during the last quarter. • The hydrocarbon .concentrations in the dissolved plume appears to have dropped in monitoring well MW-2 by at least one order of magnitude. • The concentrations of dissolved hydrocarbons in MW-3 have remained essentially stable since the previous monitoring event. :=} The hydrocarbon concentrations in air-sparging well VW-2increased by approximately an order of magnitude for BTE&X compounds and TPH-g since the previous sampling event. 4.2. RECOMMENDATIONS -� Based upon the results of the investigation, AGE recommendations the following: • The next quarterly ground water sampling event should be conducted in October of 1997. • Feasibility testing has indicated that in-situ air sparging (IAS), combined with soil vapor extraction; would be a cost-effective remediation method for this site. We recommend the installation of an SVE/IAS system, pending approval of cost recovery from the California Water Resources Control Board, 5.0. LIMITATIONS i Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities. The findings were based upon analytical results provided by an independent laboratory. Evaluations of the geologic/hydro geologic - Advanced CeoEnvironmenlal,Inc. i I i