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' REPORT QUARTERLY GROUNDWATER MONITORING i} SECOND QUARTER-APRIL, 1998 ' Canepa's Car Wash 6230 Pacific Avenue ' Stockton, California ' May 26, 1998 ' 1.0 INTRODUCTION Quarterly groundwater monitoring was conducted by Condor Earth Technologies, Inc (Condor) on April 22 and 23, 1998, at the Canepa's Car Wash facility located at 6230 Pacific Avenue in Stockton, California (Figure 1, Appendix A) This report was prepared by Condor at the request of the property owner, Mr Remo Canepa The work to be conducted during quarterly groundwater monitoring was described by Condor in Proposal for Site Evaluation and Groundwater Monitoring (April 8, 1996) The scope-of-work presented in the proposal was approved by Mr Ronald Rowe of the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) The PHS/EHD subsequently modified the approved scope-of-work to include gasoline oxygenates/additives analysis of the site groundwater samples Phis report includes a site background and a description of the fieldwork and Laboratory analyses conducted during the April 1998, quarterly groundwater monitoring 2 0 SITE BACKGROUND Canepa's Car Wash consists of an automated car washing facility, a fuel station, and a convenience store (Figure 2, Appendix A) The car wash and fuel station have been in operation for approximately 20 years IIn the Spring of 1993, three underground fuel tanks, fuel lines and dispensers were removed and replaced with a double walled system The tanks consisted of two 12 000-gallon gasoline tanks and one 5,000- gallon diesel tank Upon removal of the tanks and piping, it was discovered that the fuel lines had leaked and that the tanks had been overfilled Approximately 600 cubic yards of soil were removed from the fuel tank excavation area Beginning in March 1993 one -oil horing incl a network of nine Coli vanor extraction NVFl xxialic �xiarss drilled and installed in the area of the fuel dispenser islands Between September, 1993, and March, 1994 eight monitoring wells (MW-1 through MW-8) were installed In March, 1994, a soil vapor extraction system was installed and operated In the Fall of 1996, it was determined that tht SVE system: was inadequate and turned off Condor has been conducting Quarterly Groundwater Monitoring at the site since August 1996 Analysis of . groundwater samples collected from selected SVE wells (SVE-1, 2, 3, 5, 7, and 9) indicate that high concentrations of TPH-G, B LEX, and MTBE are present in the toriner location of the fuel dispenser islands k �e� CONDOR