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' 28 June 2002 • AGE-NC Project No 95-0130 ' Page 5 of 6 ' VW-2A and VW-3A, however, TBA was previously detected at wells MW-1, MW-2, MW-3,VW-1C and VW-2B suggesting a significant TBA-impact to ground water at the site • The only detection of dissolved EDB was in the sample collected from well VW-1C, ' however, EDB was previously detected at wells MW-7B, VW-1B, VW-1C, VW-2A and VW-2B suggesting a significant TBA-impact to ground water at the site ' • The high concentrations of petroleum hydrocarbons detected in samples collected from wells MW-6 (A, B and C), MW-7B, VW-1 (B and C), VW-2 (A and B) and VW-3 (A and B) indicate that these wells are within or near the dissolved petroleum hydrocarbon"core area" ' of the plume (Figures 4 and 5) • The lateral extent of the dissolved petroleum hydrocarbon plume is not known toward the ' northwest, north, northeast, east and southeast of the area bound by wells MW-1 through VW-3 (Figures 4 and 5), the vertical extent is not known in any area 5.0. RECOMMENDATIONS lie A Feasibility Studies and Monitoring Well Installation Work Plan was submitted to the EHD on 11 March 2002 and approved by the EHD by letter on 17 April 2002, however, based on a telephone conversation on 17 June 2002 with Mr Bob Trommer of the UST Cleanup Fund, the scope of work Ifor the above referenced work plan does not appear to be acceptable to the UST Cleanup Fund Therefore, AGE will delay scheduling any of the above field until mutual agreement is made between AGE, EHD and the UST Cleanup Fund Based upon the results of the first quarter 2002 investigation, AGE recommends • Continued quarterly ground water monitoring, the next quarterly ground water monitoring event is tentatively scheduled for June 2002 • Conduct future quarterly ground water monitoring events concurrently with the Knowles Roek site (102 South Wilson Way) and the Arco AM/PM site (130 South Wilson Way), AGE recommends that a well-head elevation survey be performed by a state-certified Isurveying engineer so that reported ground water elevations are relative to a City of Stockton benchmark datum • Continued utilization of wells VW-1B,VW-1C, VW-2A, VW-2B, VW-3A and VW-3B for characterization of ground water conditions in the"core area" • Preparation of an interim remediation work plan to continuously operate a ground water extraction system in the area of VW-1, VW-2 and VW-3 to inhibit further off-site migration • of the fuel impacted-ground water plume IAdvanced GeoEnvironmental,Inc