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Site History Canepa's Car Wash(Pacific Avenue) Page—3- During the fall of 1997, an Authority to Construct permit was applied for with the APCD for the installation of a SVE system. Prior to granting approval of the installation of the SVE system,the Underground Storage Tank Clean-Up Fund indicated the need for additional investigation. Condor subsequently conducted the installation and sampling of two soil borings adjacent to the SVE well array. The investigation included soil vapor screening using the Simulprobe sampling device in soil vapor collection mode. The results of the additional investigation indicated that high levels of volatile organic compounds were present in the soil vapor at the site. The findings of the investigation were reported in Report — Soil and Groundwater Investigation, dated June 12, 1998. Operation of the SVE system was initiated on March 15, 1999. Initial levels of up to 2000 parts per million (ppm)were reduced to under 100 ppm. Operation of the SVE was stopped on February 6, 2001 as a result in a drop in the SVE efficiency below 95%. Minor modifications and repairs were made to the blower extraction system and the SVE was restarted on July 10, 2001- By July 27th it was determined that the restarted SVE system would not maintain 95% efficiency. It was determined that the catalytic oxidation unit was not designed to efficiently remove the lower concentrations of petroleum hydrocarbon vapors left in the soil gas. In a letter dated August 20, 2001, Condor proposed a carbon treatment unit to replace the catalytic oxidation unit. In a letter dated August 24, 2001, Mr. Jeff Wong of the PHS/EHD approved the proposed action and requested that Condor submit a work plan providing details and specifications of the proposed system. Condor subsequently submitted the requested work plan dated September 24, 2001. As of the fall of 2001,system start-up was pending approval of the system modifications by the APCD. In the Report — Soil and Groundwater Investigation, dated June 12, 1998, Condor recommended additional soil and groundwater investigation to further characterize the extent of contamination at the site. In a faxed document dated July 28, 1998, Mr. Ron Rowe of the PHS/EHD requested a work plan describing the recommended additional investigation activities. In response to Mr. Rowe's request, Condor submitted the Soil Boring and Monitor Well Installation Work Plan dated November 17, 1998, describing proposed additional investigative activities. Upon review of the work plan, Mr. Rowe verbally requested that the work plan be modified to include deep aquifer characterization with a cone penetrometer. Condor prepared a letter dated May 18, 1999 providing a work plan addendum describing the proposed additional deep aquifer soil and groundwater investigation. In a letter to Mr. Remo Canepa dated May 4, 2001 Mr. Jeffrey Wong of the PHS/EHD approved the work pian dated November 17, 1998 and the work plan addendum provided by the Condor letter dated May 18, 1999. Due to a directive frons. the Underground Storage Tank Cleanup Fund (USTCF), laboratory analyses of groundwater samples for gasoline oxygenates/additives by EPA Method 8260 was discontinued beginning with the October 1999, quarterly groundwater monitoring event. The USTCF indicated that analysis by EPA Method 8260 is not warranted based on historical groundwater laboratory analytical results. Commencing with the October 1999, quarterly groundwater monitoring event, laboratory analyses of groundwater samples for gasoline oxygenates/additives is limited to MTBE using EPA Method 602. In response to a request by Mr. Wong of the PHS/EHD, Condor submitted a Groundwater Mounding Study Work Plan, dated August 15, 2001. Mr. Wong of the PHS/EHD approved the work plan in a letter dated August 25, 2001. Performance of the mounding study was anticipated to be conducted in the fall of 2001, pending the installation of the additional proposed monitor wells described above.