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16 <br /> GeofogicarTechnics inc. <br /> ' 2741 q�tvergi oad <br /> 9Hodesto,Calzfanzw 95351 <br /> (209)538-6424/'Fax,#538-5852 <br /> Report <br /> ' Additional Site Characterization <br /> ' Cardoza <br /> Super Stop Market <br /> 290 N. Main St. <br /> Manteca, CA <br /> Project No 662 2 <br /> June 12, 2001 <br /> 1.0 INTRODUCTION <br /> In March of 1998 a total of six angle boreholes were hand augured beneath the three <br /> existing 8,000 gallon USTs, one beneath each end Slight amounts of MTBE, Toluene, and <br /> Xylene were detected in one sample <br /> ' On April 29 and May 26, 1998 Cardoza Enterprises was directed by San Joaquin County <br /> Environmental Health Department to submit a work plan to determine if residual soil or <br /> groundwater contamination exists beneath the tanks Two direct push soil borings were <br /> installed in August of 1998 Results showed the presence of fuel oxygenate compounds in <br /> ' the soil and BTEX, TPH-G and the fuel oxygenate compounds in the groundwater <br /> In March of 1999, the three underground fuel storage tanks and associated product lines and <br /> vent lines were removed At that time soil samples were collected and tested according to <br /> the regulator's discretion A new storage tank and dispenser system was then installed and <br /> the station returned to operation <br /> ' On January 5, 2000, three soil borings were drilled at the site and converted into <br /> groundwater monitoring wells Six quarterly sampling/monitoring events have been <br /> completed since the installation of wells MW-1 through MW-3 Groundwater samples <br /> collected from MW-1 and MW-3 have contained elevated concentrations of the gasoline <br /> oxygenate MTBE Well MW-2 has not contained contaminant concentrations above the <br /> laboratory reporting limits <br /> ' This report summarizes the additional soil and groundwater investigative work conducted <br /> on May 16 & 17, 2001 To further investigate the lateral extent of soil and groundwater <br /> impacted with gasoline range petroleum hydrocarbons, Geological Technics Inc installed <br /> ' seven (7) GeoProbe boreholes (GP-3 through GP-9), collected soil and groundwater <br /> samples, and analyzed these samples for petroleum hydrocarbon compounds The locations <br /> of the GeoProbes are illustrated in Figure 2 <br />