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I REPORT QUARTERLY GROUNDWATER MONITORING FOURTH QUARTER- OCTOBER, 1998 iCanepa's Car Wash 6230 Pacific Avenue Stockton,California November 17, 1998 ' 10 INTRODUCTION Quarterly groundwater monitoring was conducted by Condor Earth Technologies, Inc (Condor) on October 22 and 23, 1998, at the Canepa's Car Wash facility located at 6230 Pacific Avenue in Stockton, I California (Figure 1, Appendix A) This report was prepared by Condor at the request of the property owner, Mr Remo Canepa The scope-of-work performed during the quarterly groundwater monitoring event was described in Condor's Proposal for Site Evaluation and Groundwater Monitoring(April S, 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 PHSIEHD subsequently modified the approved scope-of-work to include gasoline oxygenates/additives analysis of the site groundwater samples This report includes a site background, a description of the fieldwork and laboratory analyses performed for the October, 1998, 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 approximately 20 ' years In the Suring 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, I1994, 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 Iwas inadequate and operation of the system was terminated Condor has conducted Quarterly Groundwater Monitoring activities at the site since August, 1996 Analyses of groundwater samples collected from selected SVE wells (SVE-1, 2, 3, 4, 5, 7, 8, and 9) indicate that high concentrations of benzene, toluene, ethyl benzene, and total xylenes (BTEX), total pe oleum I �� CONDOR