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QUARTERLY GROUNDWATER MONITORING REPORT THIRD QUARTER-JULY 1999 Canepa's Car Wash I 248 East Park Street Stockton, California ' August 31,1999 1 INTRODUCTION Condor Earth Technologies, Inc (Condor) conducted quarterly groundwater monitoring on July 28, 1999, 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 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/E11D This report includes a site background, a dest,ription of the field and laboratory analyses performed for the July 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, Inc (WHF), the soil samples collected from the UST excavation were collected from approximately 16 feet below the ground surface(bgs) and 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 ' Beginning 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 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 dated November 17, 1998 was prepared 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—JULY 1999 ' On July 28 1999, a Condor representative 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-4, MW-6, MW-3, MW-1, MW-7, MW-2, and MW-5 1 ' %4 CONDOR