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1 I INTRODUCTION At the request of ExxonMobil Refining and Supply Company (formerly Exxon Company, ' U S A ), ETIC Engineering, Inc (ETIC) has prepared this soil bonng results and request for case closure report for former Exxon Retail Site (RS) 7-0137, located at 1605 South El Dorado Street, Stockton, California This report documents (1) the results of soil and groundwater samples collected from five confirmation soil borings and (2) the compilation of historical site data in support of a request for case closure ' 1.1 SITE LOCATION AND DESCRIPTION Former Exxon RS 7-0137 is situated in southern Stockton, approximately 0 6 miles east of ' Interstate 5 at an elevation of approximately 16 feet above mean sea level (Figure 1) The subject site is currently an active service station (EZ Mini-Mart) with one 20,000-gallon double-walled fiberglass underground storage tank (UST) divided into two compartments that ' have 60 and 40 percent of the total volume capacity Information regarding the history of station operation at 1605 South El Dorado Street was ' obtained through a telephone interview of a staff member at the City of Stockton Planning Department (CSPD), conducted by EA Engineering, Science, and Technology (EA) in May ' 1998 Based on the telephone interview, the subject property has been issued only one use permit and was initially a Regal service station with USTs in 1954 (EA 1998) From 1954 to 1988, title information for the service station could not be released by the CSPD The site was purchased by Exxon in July 1988 with the existing building, canopy, pump islands, and three 10,000-gallon single-walled steel UST's containing regular leaded, regular unleaded, and premium unleaded fuels, which were removed in 1992 The service station was inactive between ' 1990 and 1992 The existing 20,000-gallon UST was installed in approximately 1993 Exxon sold the property to Nathan Due in April 1994 The property is currently owned by Karamjit S Grewal et al of Turlock, California During previous investigations, seven groundwater monitoring wells (MW1—MW7) and two vapor extraction wells (VEW1 and VEW2) were installed, and a vapor extraction system was ' installed and operated at the site Figure 2 shows the locations of the station features and wells, which are sampled quarterly 1.2 SCOPE OF WORK PERFORMED The scope of work documented in this report, which includes confirmation soil borings and data ' compilation in support of case closure, is presented below 1.2 1 Confirmation Soil Borings In accordance with the October 1998 Work Plan for Confirmation Soil Borings in Support of a Request for Case Closure submitted by EA (EA 1998), and amendments made in the Public Health Services of San Joaquin County, Environmental Health Division (PHS-EHD) approval- , F I Projeds%70137�[vWcw 1 W p C10sua e 1 10650137utcv doc 1 I}