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y ' REPORT SOIL AND GROUNDWATER INVESTIGATION ' CANEPA'S CAR WASH 6230 PACIFIC AVENUE ' STOCKTON,CALIFORNIA PREPARED BY CONDOR EARTH TECHNOLOGIES,INC. June 12, 1998 ' 1 INTRODUCTION I A soil and groundwater investigation was conducted at Canepa's Car Wash, Iocated at 6230 Pacific Avenue, Stockton, California (Figure 1, Appendix A) The work was conducted in accordance with a Work flan dated January 21, 1998, prepared by Condor Earth Technologies, Inc , (Condor), and ' approved by Mr Ronald Rowe of the San Joaquin County Public Health Services/Environmental Health Division (PHS/GHD) The work was conducted at the request of Mr Remo Canepa to meet the provisions of the California Underground Storage Tank Clean-up Fund (UST-CF) for pre-approval of corrective action costs for the installation of an interim soil vapor extraction system proposed for this ' site The purpose of the work was to further investigate the lateral and vertical extent of gasoline contamination in site soil and to investigate the vertical component of gasoline contamination in site groundwater The work consisted of the installation and sampling of two soil borings using continuous sampling technology and Simutprobe discrete simultaneous soil, soil gas, and groundwater sampling ' technology All work conducted by Condor was performed under the supervision of a California State Registered Geologist This report includes a description of the fieldwork and laboratory analyses 2 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 has been in operation for approximately 20 years In the Spring of 1993, three underground fuel tanks, fuel lines and dispensers were removed and replaced with a doubled walled system 1 he tanks consisted of two 12,000-gallon gasoline tanks and one 5,000- gallon diesel tank When the tanks were removed it was discovered that the fuel Iines 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 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, I 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 turned off A detailed Site History is included in Appendix B ILe� CONDOR