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I ' QUARTERLY GROUNDWATER MONITORING REPORT • SECOND QUARTER—JULY, 2000 Canepa's Car Wash 248 East Park Street ' Stockton, California ' November 9, 2000 L INTRODUCTION ' Condoi Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on July 12 and 13, 2000, at the Canepa's Cai Wash facility located at 248 East Park Street in Stockton, Califoinia (Figure 1, Appendix A) The groundwater monitoring was conducted at the request of Mr Remo Canepa, facility owner, ' in response to direction fiom Mr Ronald Rowe of the San Joaquin County Public Health 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 pertormed was approved by Mr Ronald Rowe of the PHS/EHD This report includes site background ' information a desciiption of the field and laboratory analyses performed foi the July 2000 quarterly monitoring event, discussion of results, and recommendations 2. SITE BACKGROUND The site is located in the downtown business district of Stockton, Califoinia 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 (WHF), soil samples collected fiom the UST excavation from approximately 16 feet below the ground surface (bgs) contained elevated concentrations of gasoline and gasoline constituents Between September, 199 i and March 1994, WHF installed six soil boi rugs 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 fiom 45 to 65 feet bgs MW-4 through MW-7 were constructed with a screen interval tiom 40 to 60 feet bgs Beginning in April 1997, Condos implemented a quarterly groundwater monitoring program at the site F'ollowina the July 1998 quarterly gioundwatei monitoring event, Mr Rowe of the PHS/EHD ordered the installation of additional monitor wells The previously installed monntoi wells (MW-1 through MW-7) are screened below the present groundwater table A work plan dated November 17, 1998, was prepared by Condor for the installation of tour additional rrnonrtor wells (MW-8 through MW-1 1) and is currently pending approval by the PHS/EHD I3 QUARTERLY GROUNDWATER MONITORING — JULY, 2000 On July 12 and 13, 2000 a Condor representative made field observations and collected groundwater samples fiom the Seven monitor Nvells at the site (see Figure 2, Appendix A, For well locations) The sampling order was as fol lows M W-6 M W-i M W-1, M W-4, M W-7, M W-1, and M W-5 I `� CONDOR