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y F 1 21 December 2005 AGE-NC Project No 99-0624 ' Page 4 of 4 ' The fuel additive TAME was detected in samples from wells MW-2 and MW-3 at a maximum concentration of 310 µg/l (MW-2) ' S.O. RECOMMENDATIONS Based on the findings of this investigation, AGE recommends continuation of the quarterly ground ' water monitoring program The next monitoring event is scheduled for December 2005 In accordance with the EHD-approved Site Assessment WorkPlan-Addendum(dated 24 June 2005), in December 2005 AGE completed the Installation of three (3) ground water monitoring wells and four (4) soil borings to be converted to soil vapor extraction wells A report of findings for all ' upcoming drilling activities will be submitted to the EHD during the first quarter of 2006 1 Ground water batch removal activities were performed at well MW-2 between 18-21 October 2005, ' a report of findings was submitted to the EHD on 08 November 2005, in accordance with the EHD directive letter dated 12 August 2005 for performance of two (2), separate batch removal events, AGE has tentatively scheduled a batch removal event from well MW-2 for January 2006 ' Ground water batch removal could be Improved with the installation of a ground water extraction well near well MW-2 AGE has previously proposed the well Installation of a ground water ' extraction well in the November 2004 Site Assessment Work Plan AGE recommends the Installation of the ground water extraction well at well MW-2 and Implementation of an Interim ground water extraction remediation to mitigate the off-site migration of the dissolved MTBE The State Water ' Resource Control Board document Guidelines For Investigation and Cleanup of MTBE and Other Ether-Based Oxygenates,dated 27 March 2000,directs that"Removing MTBE from the subsurface at high concentrations is much more cost effective than extracting ground water or vapor with low ' concentrations" Further more,the documents states" aggressive Interim remediation in the source area can help to diminish the changes of creating a large dilute plume of MTBE" ' 6.0. LIMITATIONS ' Our professional services were performed using that degree of care and shill ordinarily exercised by environmental consultants practicing in this or similar localities The findings were based upon ' analytical results provided by an independent laboratory Evaluation ofthe hydrogeologic conditions at the site for the purpose of this investigation was made from a limited number of available data points(ie ground water samples)and subsurface conditions may vary away from these data points ' No other warranty,expressed or Implied, is made as to the professional interpretations,opinions and recommendations contained in this report i ' Advanced GeoEnvironmental,Inc r