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l l QUARTERLY GROUNDWATER MONITORING THIRD QUARTER 2001 AND SENSITIVE RECEPTOR SURVEY REPORT Canepa's Car Wash 6230 Pacific Avenue Stockton California August 16,2001 r 1.0 INTRODUCTION ICondor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on July 19 and 20, 2001, at the Canepa's Car Wash facility located at 6230 Pacific Avenue (site) in Stockton, California (Figure 1, Appendix A) A sensitive receptor survey to identify potential receptors within 2,000 feet of the site was completed by Condor during August 2001 Condor prepared this report at the request of the Iproperty owner, Mr 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 In a letter dated May 4, 2001, Mr Jeffrey Wong of the PHS/EHD recommended repairing and restarting the existing soil vapor extraction (SVE) system by June 5, 2001 In a letter dated May 14, 2001, Condor requested the date to repair and restart the SVE system be extended to July 5, 2001 Mr Wong approved the extension in a letter dated May 18, 2001 In the above referenced letter dated May 4, 2001, Mr Wong also requested the completion of a survey of wells within a 2,000-foot radius of the site and a report of findings submitted by August 5, 2001 In the letter dated May 14, 2001, Condor requested the due date for the sensitive receptor survey report be extended to August 20, 2001 Mr Wong approved the extension in the letter dated May 18,2001 This report includes site background information, a description of the fieldwork and laboratory analyses performed for the July 2001 quarterly groundwater monitoring event, discussion of results, SVE system maintenance data, the results of the sensitive receptor survey, and recommendations r2.0 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 tanks and one 5,000-gallon diesel tank 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 �� CONDOR