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i n Site History Canepa's Car Wash(Pacific Avenue} Page 3 of 7 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, and continues as of the date of this report. Due to a directive from 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 602.0 i 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 plan dated November 17, 1998 and the work plan addendum provided by the Condor letter dated May 18, 1999. Due to a directive from the Underground Storage Tank Cleanup Fund (USTCF), laboratory analysis 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 approved the work plan in a letter dated August 25, 2001, pending the installation of the additional proposed monitor wells described above. In August 2001, Condor conducted a sensitive receptor survey within a 2,000-foot radius of the site to identify potential areas of groundwater recharge or discharge (surface water bodies), schools, and potential water well users that could be impacted by migration of groundwater from the site. The results of the sensitive receptor survey are included in the Quarierly Groundwater Monitoring (Third Quarter 2001) and Sensitive Receptor Survey Report, dated August 16, 2001. The results indicated the presence of several domestic and municipal wells, two schools, three child-care facilities, and three LUST sites within