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' QUARTERLY GROUNDWATER MONITORING REPORT SECOND QUARTER - APRIL 1999 ' Canepa's Car Wash 248 East Park Street Stockton, California I May 31,1999 ' L INTRODUCTION Condor Earth Technologies, lnc, (Condor) conducted quarterly groundwater monitoring on April 22 and 23, ' 1999, at the Canepa's Car Wash facility located at 248 East Part. 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 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 report includes a site background, a ' description of the field and laboratory analyses performed for the April 1999, 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 ' 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, me (WHF), the soil samples collected from the UST excavation were collected from approximately 16 feet below the ground ' surface (bas) and contained elevated concentrations of gasoline and gasoline constituents Between September, 1993, and March, 1994, WHh 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 Begnining in April, 1997, Condor implemented a quarterly groundwater tnonitoring program at the site Following the July, 1998 quarterly groundwater monitoring event, Mr Rowe of the P1IS/EI-1D ordered the ' installation of additional monitor wells The previously installed monitor wells (MW-1 through MW-7) are screened below the present groundwater table Water level measurements made at the site on October 21, 1998, indicated that the groundwater table was between 23 5 and 25 3 feet bgs A Work Plan has been prepared ' for the installation of four additional monitor wells (MW-8 through MW-11) and is currently pending approval by the PH S/EHD 3. QUARTERLY GROUNDWATER MONITORING— JANUARY 1999 On April 22 and 23, 1999, a Condor representative made field observations and collected groundAater samples from the seven monitor wells at the site (see Figure 2, Appendix A for well locations) The sampling order ' was as follows MW-4, MW-3, MW-6, MW-5, MW-2 MW-7, and MW-1 It Nziit" ' �� CONDOR