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CeoCogccaE� Techs cs Inc. <br /> ' E 101 7"'Sheet <br /> Modesto Cahlornia 95354 <br /> (209)522-4119/Fax#522-4227 <br /> Work Plan <br /> Soil and Groundwater Investigation <br /> Super Stop Market <br /> Cardoza Enterprises <br /> 290 N Main St. <br /> ' Manteca, CA <br /> Project No 662 2 <br /> January 17, 2003 <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 at the site Minor amounts of MTBE, Toluene, and Xylene were <br /> detected 1n soil samples <br /> On April 29 and May 26, 1998 Cardoza Enterprises was directed by San Joaquin County <br /> Environmental Health Department (SJC/EHD) to submit a work plan to determine if <br /> residual soil or groundwater contamination exists beneath the tanks (see Figures 1 & 2) <br /> Two direct push soil borings were installed in August of 1998 Results showed the presence <br /> of fuel oxygenate compounds in the soil and BTEX, TPH-G and the fuel oxygenate <br /> compounds in the groundwater <br /> In March of 1999, the three underground fuel storage tanks and associated product lines and <br /> 1 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 installed and the <br /> station returned to operation <br /> ' On January 5, 2000, three soil borings were drilled at the site and converted into <br /> groundwater monitoring wells Twelve quarterly sampling/monitoring events have been <br /> completed since the installation of wells MW-I through MW-3 Groundwater samples <br /> ' collected from MW-I 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 since its' installation <br /> On May 16 & 17, 2001 Geological Technics Inc (GTI) advanced seven (7) GeoPiobe <br /> boreholes (GP-3 through GP-9), collected soil and groundwater samples, and analyzed these <br /> samples for petroleum hydrocarbon compounds The results of the laboratory analyses did <br /> not reveal shallow soil or groundwater contamination along the eastern or southern side of <br /> the parcel <br />