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i REPORT • QUARTERLY GROUNDWATER MONITORING SECOND QUARTER—APRIL 2001 Canepa's Car Wash I 6230 Pacific Avenue Stockton, California May 31,2001 1.0 INTRODUCTION Condoi Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on April 10 and 11, 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 IRemo Canepa The scope-of-work performed during the quarterly groundwater monitoring event is described in I 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 I • approved scope-ot-work to include gasoline oxygenates/additives analyses of the site groundwater samples This ieport includes site background information, a description of the fieldwork and laboratory analyses peiformed for the April 2001 quarterly groundwater monitoring event, discussion of results, soil I vapor extraction (SVE) system maintenance data as requested by Mr Rowe of PHS/EHD, and recommendations I 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 more than two decades In the spring of 1993, three underground storage tanks (USTs), fuel lines and dispensers were removed and replaced with a double walled system The former USTs consisted of two 12,000-gallon gasoline USTs and one 5,000-gallon diesel UST Upon iemoval 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 IBeginning in March 1993, one soil boring and a network of time SVE wells were drilled and installed in the area of the fuel dispenser islands Between September 1993 and March 1994, eight monitoring wells I (MW-I through MW-8) were installed In March, 1994, a SVE system was installed and operated to 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 installed and began operation on March 15, 1999 ICondor has conducted quarterly groundwater monitoring activities at the site since August 1996 Analyses . of groundwater samples collected from 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 �� CONDOR