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REPORT QUARTERLY GROUNDWATER MONITORING FIRST QUARTER-JANUARY 1999 Canepa's Car Wash ' 6230 Pacific Avenue Stockton, California February 8, 1999 I10 INTRODUCTION Condor Earth Cecllnologles, Inc (Condor) conducted quarterly groundwater monitoring on January 21 and 22, 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 The scope-of-work performed during the quarterly groundwater monitoring event was described in Condor's Proposal fol Site Evaluation and Groundwater Monitor ang (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 PHS/131-11D 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 January 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) fhe car wash and fuel station have been in operation for approximately 20 years ' In the Spring of 1993, three underground storage tanks (USTs), fuel Imes and dispensers were removed a replaced _ th a li. L.1.. . allc 7 . st. 111. iTQFr, +oil —P4,— 11 non gallon .�..o rTc Tr 1 allu lG�flnl C it W llll Cl lIV 11 Lill V�QII�u ay llV�il 11w 1 a mis aLed Vl u-o I- -0 gallon bast 1111V V 1 a 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 1Vlarcn, 1993, one soil luring and a lictwuIK of nint; dull vapol Glitla(moll (J Y G) 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 war inadequale 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 petroleum hydrocarbons quantified as gasoline (TPH-G), and methyl tertiary-butyl ether (MTBE) are present e former location of the fuel dispenser islands -1%�, �� CONDOR