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Ceologccal.reChAws Inc. <br /> 1101 7"Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax#522-4227 <br /> Interim Remedial Action Plan <br /> Soil and Groundwater Remediation <br /> Super Stop Market <br /> Cardoza Enterprises <br /> f 290 N. Main St. <br /> Manteca, CA <br /> Project No. 662.2 <br /> March 28, 2005 <br /> Lo INTRODUCTION r <br /> In March of 1998 a total of six angle boreholes were manually augered beneath the three <br /> existing 8,000 gallon USTs at the site. Minor amounts of MTBE, Toluene, and Xylene were # <br /> detected in soil samples. <br /> On April 29, 1998 Cardoza Enterprises was directed by San Joaquin County Environmental <br /> Health Department (SJC/EHD) to submit a work plan to determine if residual soil or <br /> groundwater contamination exists beneath the tanks (see Figures I & 2). Two direct push <br /> soil borings were installed in August of 1998. Laboratory results showed the presence of fuel <br /> oxygenate compounds in the soil, and BTEX, TPH-G and the fuel oxygenate compounds in <br /> groundwater. <br /> l <br /> In March of 1999, the three underground fuel storage tanks, their associated product and vent � <br /> lines were removed. At that time soil samples were collected and tested according to the <br /> regulator's discretion. A new storage tank and dispenser system was installed and the station <br /> returned to operation. <br /> On January 5, 2000, three soil borings were drilled at the site and converted into groundwater <br /> monitoring wells. Groundwater samples collected from MW-1 and MW-3 have contained <br /> elevated concentrations of the gasoline oxygenate MTBE. Well MW-2 has not contained <br /> contaminant concentrations above the laboratory reporting limits since its installation. <br /> 1 On May 16 & 17, 2001 Geological Technics Inc. (GTI) advanced seven (7) GeoProbe <br /> boreholes (GP-3 through GP-9), collected soil and groundwater samples, and analyzed these <br /> v' <br />