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I . REPORT ' QUARTERLY GROUNDWATER MONITORING SECOND QUARTER—APRIL 2000 ' Canepa's Car Wash 6230 Pacific Avenue Stockton California ' September 15, 2000 ' 1.0 INTRODUCTION Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on April 11, 12 ' and 13, 2000, at the Canepa's Car Wash facility located at 6230 Pacific Avenue in Stockton, California (Figure 1, Appendix A) Condor prepared this report at the request of the property owner, Mi Remo Canepa The scope-of-work performed during the quarterly groundwater monitoring event is described in 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 April 2000, 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 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 removal of the USTs and piping, it was discovered that the filel 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 A - led a tall1 .a th l"the lfiUe dispenser islands Between Cerntemher 100'3 and Mnr_h 1004 UI IIIGU 0.11U 111�]LQ11l.LL 111 111E arca of LLIN RUNT <y��N��.�Ni 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 operation of the system was terminated A second SVE system was later installed and T� began operation on March 15, 1999 • 1 ' t� CONDOR