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REPORT QUARTERLY GROUNDWATER MONITORING FOURTH QUARTER_ OCTOBER 1999 ' Canepa's Car Wash 6230 Pacific Avenue ' Stockton, California ' November 22, 1999 1.0 INTRODUCTION Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on October 13 and 14, 1999, 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 I The scope-of-work performed during the quarterly groundwater monitoring event is described in Condor's 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 This report includes site background information, a description of the field work and laboratory analyses performed for the October 1999 quarterly groundwater monitoring event, discussion of results, and recommendations 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 than two decades In the Springy; of 1993, three underground storage tanks (USTs), fuel lines and dispensers were removed and replaced with a double walled system The USTs consisted of two 12,000-gallon gasoline USTs and one 5,000-gallon diesel UST Upon removal of the USTs and piping, it was discovered that the fuel lines had leaked and that the USTs had been overfilled Approximately 600 cubic yards of soil were removed from the UST excavation area Beginning in March 1993, one soil boring and a network of nine soil vapor extraction (SVE) wells were 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 the SVE system was inadequate and operation of the system was terminated A second SVE system was later mstailea and began operation in March 15, 1999 Condor has conducted Quarterly Groundwater Monitoring activities at the site since August 1996 Analyses of groundwater samples collected from the SVE wells (SVE-1 through 9) indicate that high concentrations of benzene, toluene, ethyl benzene, and total xylenes (BTEX), total petroleum hydrocarbons quantified as gasoline (TPH-G), and methyl tertiary-butyl ether (MTBE) were present in the former location of the fuel dispenser islands n I L� CONDOR