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tabulated analytical data from this investigation can be found in the Condor-prepared Soil and Ground water Investigation and Sensitive Receptor Survey Report, dated 02 October 2000 In September 2000, a sensitive receptor survey was conducted for the site The drainage ditch and island drainage channel are the only potential receptors within a 1,000-foot radius of the site Ms Margaret Lagorio of San Joaquin County EHD referred the site to the CVRWQCB for oversight by letter to Mr Marty Hartzell of CVRWQCB, dated 05 January 2001 According to Ms Lagono the action was taken because of their determination that the source of the MTBE contamination was the AST system and not the former UST system In an internal memo dated 29 March 2001, the CVRWQCB concurred with the PHS-EHD decision and transferred the site to the CVRWQCB Site Cleanup Section for further oversight i On 02 April 2001, the CVRWQCB issued a letter stating that no further action is required for the former UST system at the site By letter dated 05 June 2001,Ms Wendy Cohen of CVRWQCB finalizedMonitoring and Reporting Program (MRP) No 5-01-0835 and approved Additional Ground Water Investigation Work Plan, dated 07 May 2001, prepared by Condor The MRP describes the ground water monitoring and reporting requirements for the site The work plan was prepared to further investigate the lateral and vertical extent of impacted ground water Ms Cohen also agreed with Condor's recommendation to abandon well MW-1, since it is no longer a necessary monitoring point for the MTBE plume associated with the AST system at the site On 07 through 09 October 2002, Advanced GeoEnvironmental, Inc (AGE) advanced seven soil borings at the site Pilot borings MW5 through MW 10 were completed as groundwater monitoring wells using two-inch diameter PVC casing with 0020-inch slotted screen installed from approximately 4 feet to 14 feet bsg in borings MW5, MW9, and MW 10 and from approximately 50 feet to 60 feet bsg in borings MW6,MW7 and MW9 with blank casing extended to the surface EW 1 was completed as a ground water extraction well using six-inch diameter PVC casing with 0 020- inch slotted screen installed from approximately 4 feet bsg to 19 feet bsg TPH-g was detected at a maximum concentration of 4,000 mg/kg(MW6-5) BTEX was detected at a maximum concentration of 34mg/kg,310 mg/kg, 110 mg/kg and 720 mg/kg,respectively(MW6- 5) The fuel oxygenates MTBE and TAME were detected at maximum concentrations of 56 mg/kg (EPA Method 8260B) and 2 2 mg/kg in sample MW6-5 TBA was detected at a concentration of 0 30 mg/kg in soil sample MW7-5 Additional information can be found in the AGE-prepared Monitoring and Extraction Well Installation Report dated 01 November 2002 A more detailed description of previous investigations at the site can be found in the Condor-prepared documents Quarterly Ground Water Monitoring Report Second Quarter 2001, dated 31 July 2000,and Soil and Groundwater Investigation and Sensitive Receptor Survey Report, dated 02 October 2000 Advanced GeoEnvironmental,Inc