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1 1 • QUARTERLY GROUNDWATER MONITORING REPORT ISECOND QUARTER—APRIL, 2000 Canepa's Car Wash ' 248 East Park Street Stockton California September 115, 2000 I1.0 INTRODUCTION Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on April 18 and ' 19, 2000, at the Canepa's Car Wash facility located at 248 East Park Street in Stockton California (Figure 1, Appendix A) The groundwater monitoring was conducted at the request of Mr Remo Canepa, facility owner, in response to direction from Mr Ronald Rowe of the San Joaquin County Public Health I Services, Environmental Health Division (PHS/EHD) The work conducted during the quarterly groundwater monitoring was performed in general accordance with approved protocol formerly established for the site The scope-of-work performed was approved by Mr Ronald Rowe of the PHS/EHD This ieport includes site background information, a description of the field and laboratory analyses performed for the April 2000 quarterly monitoring event, discussion of results, and recommendations lie 2,0 SITE BACKGROUND The site is located in the downtown business district of Stockton California One 12,000-gallon unleaded gasoline underground storage tank (UST), one 5,000-gallon leaded gasoline UST, and one 5,000-gallon diesel fuel UST were removed from the site in 1990 According to WHF Environmental Consultants, Inc I (WHF), soil samples collected from the UST excavation from approximately 16 feet below the ground surface (bgs) contained elevated concentrations of gasoline and gasoline constituents Between September, 1993 and March 1994, WHF installed six soil bot Engs and seven monitor wel is in and around the site Three of the monitor wells (MW-1, MW-2, and MW-3) were constructed with a screened interval horn 45 to 65 feet bgs MW-4 through MW-7 were constructed with a screen interval from 40 to 60 feet bgs Beginning in April 1997, Condoi implemented a quarterly groundwater monitoring program at the site Following the luly 1998 quarterly groundwater monitoring event, Mr Rowe of the PHS/EHD ordered the installation of additional monitor wells The previously installed monitor wells (MW-1 through MW-7) are scccened below the present groundwater table A work plan dated November 17, 1998, was prepared by Condor for the installation of four additional monitor wells (MW-8 through MW-1 1) and is currently pending approval by the PHS/EHD 3 0 QUARTERLY GROUNDWATER MONITORING— APRIL,2000 On Ap>>l 18 and 19, 2000, a Condor representative made field observations and collected groundwater samples horn the seven monitor wells at the site (see Figure 2, Appendix A, for well locations) The 0 sampling older was as follows MW-5, MW-4, MW-1, MW-6, MW-3, MW-7, and MW-2 IL, CONDOR