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GeofogicafTechnics Znc. ' 2741 River Road Modesto,CaCf ma 95351 (209)538-6424/FaX 538 5852 Report ' Additional Site Characterization Cardoza Super Stop Market 290 N. Main St. ' Manteca, CA Project No 662 2 January 19, 2000 10 INTRODUCTION In March of 1998 a total of six angle boreholes were hand augured beneath the three existing 8,000 gallon USTs, one beneath each end Slight amounts of MTBE, Toluene, and Xylene were detected in the soil sample from B-1 ' On April 29 and May 26, 1998 Cardoza Enterprises was directed by San Joaquin County Environmental Health Department to submit a work plan to determine if residual soil or groundwater contamination exists beneath the tanks Two direct push soil borings were installed in August of 1998 Results showed the presence of fuel oxygenate compounds in the soil and BTEX, TPH-G and the fuel oxygenate compounds in the groundwater In March of 1999, the three underground fuel storage tanks and associated product lines and vent lines were removed At that time soil samples were collected and tested according to the regulator's discretion A new storage tank and dispenser system were then installed and the station returned to operation This report summarizes the additional soil and groundwater investigative work conducted on January 5, 2000 Three soil borings were drilled at the site and converted into groundwater monitoring wells that were screened from 20 to 40 feet below ground surface Soil samples collected from MW-1 and MW-3 showed only low levels of Toluene, Xylene, MTBE and TBA All other soil samples were non-detect i, 2.0 SCOPE OF INVESTIGATION 2.1 Soil Boring Installation In an effort to define the lateral extent of gasoline range petroleum hydrocarbons, three (3) soil borings were drilled to a depth of 40 feet below ground surface (bgs) The boreholes