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' REPORT QUARTERLY GROUNDWATER MONITORING FIRST QUARTER—JANUARY 2001 ' Canepa's Car Wash ' 6230 Pacific Avenue Stockton, California ' January 23, 2001 1.0 INTRODUCTION ' Condor Earth Technologies, Inc (Condor)conducted quarterly groundwater monitoring on January 9 and 10, 2001, 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 scope-of-work performed during the quarterly groundwater monitoring event is desci ibed to ' 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 analyses of the site groundwater samples This report includes site background information, a description of the fieldwork and laboratory analyses performed for the January 2001 quarterly groundwater monitoring event, discussion of results, soil vapor extraction (SVE) system maintenance data as requested by Mr Rowe of PHS/EHD, and recommendations 2.0 SITE BACKGROUND Canepa's Cai Wash consists of an automated c,ar washing facility, a fuel station, and a convenience store (Figure 2, Appendix A) I he cai wash and fuel station have been in operation for rnoie than two decades In the spring of 1993, three undeiground stoiage tanks (USTs), fuel lines and disperiseis were removed and ieplaced with a double walled system The former USFs consisted of two 12,000-gallon gasoline I 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 SVE wells were drilled and installed in the aiea of the fuel dispenser islands Between September 1993 and March 1994, eight monitoring wells (ivi'vv'-i iiiluugh Lvi`w'-o") were insialied in i"vlaren, 1994, a S'vE system was instauea ana operated in the Fall of 1996, 1t was deteimined that the SVE systenn wins inadequate and opeiation of the system was terminated A second SVE system was latei installed and began operation on March 15, 1999 Condor has conducted quarterly groundwater monitoring activities at the site since August 1996 Analyses • ofgroundwatei samples collected fiom the SVE wells (SV-1 through 9) indicate that high concentrations of Ibenzene, toluene, ethyl benzene, and total xylenes (BTEX), total petroleum hydrocarbons quantified as I � �a CONDOR