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QUARTERLY GROUNDWATER MONITORING REPORT SECOND QUARTER—APRIL 2001 Canepa's Car Wash I 248 East Park Street Stockton, California May 28,2001 I. INTRODUCTION ' Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on April 12 and 13, 2001, at the Canepa's Car Wash facility located at 248 East Park Street in Stockton, California I (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 formerly of the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) The work conducted during the I quarterly groundwater monitonng was performed in general accordance with approved protocol formerly established for the site The scope-of-work performed was approved by Mr Rowe This report includes site background information, a description of the field and laboratory analyses performed for the April I2001 quarterly monitoring event, discussion of results, and recommendations 2. SITE BACKGROUND The site is located in the downtown business district of Stockton, California One 12,000-gallon unleaded r 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 WET Environmental Consultants, Inc (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 borings and seven monitor wells in and around the site Three of the monitor wells (MW-1, MW-2, and MW-3) were constructed with a screened interval from 45 to 65 feet bgs MW-4 through MW-7 were constructed with a screen interval from 40 to 60 feet bgs IBeginning in April 1997, Condor implemented a quarterly groundwater monitoring program at the site Following the July 1998 quarterly groundwater monitoring event, Mr Rowe of the PHS/EHD requested ' the installation of additional monitor wells The tops of the screened intervals of monitor wells MW-1 through MW-7 are submerged 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- 11)and is currently pending approval by the PHS/EHD 3. QUARTERLY GROUNDWATER MONITORING—APRIL 2001 IOn April 12 and 13, 2001, Condor representatives made field observations and collected groundwater samples from the seven monitor wells at the site (see Figure 2, Appendix A, for well locations) The sampling order was as follows MW-5,MW-7, MW-2, MW-4, MW-6, MW-3, and MW-1 i� CONDOR