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GeologicafTechn w* s Inc, <br /> ' 2741 River Road <br /> Modesto,Ca&forma 95351 <br /> (209)538-64241Fax#538-5852 <br /> Work Plan <br /> ' Additional Soil and Groundwater Investigation <br /> ' Super Stop Market <br /> Cardoza Enterprises <br /> 290 N. Main St. <br /> t Manteca, CA <br /> Project No 662 2 <br /> October 18, 1999 <br /> ' <br /> 10 INTRODUCTION <br /> In March of 1998 a total of six angle boreholes were hand augured beneath the three existing <br /> 8,000 gallon USTs, one beneath each end Slight amounts of MTBE, Toluene, and Xylene <br /> ' were detected in the soil sample from B-1 <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 the <br /> ' regulator's discretion A new storage tank and dispenser system were then installed and the <br /> station returned to operation <br /> This work plan is prepared to address the groundwater contamination discovered during the <br /> ' work performed in 1998 <br /> ' 2.0 PROPOSED INVESTIGATION <br /> The purpose of this investigation is to further define the extent of soil and groundwater <br /> ' impacted with gasoline compounds To accomplish this goal, GTI proposes to install three <br /> boreholes/monitoring wells at the site <br /> 2.1 Soil Boring <br /> ' Soil boring permits will be secured as necessary and the local regulatory agency will be <br /> inotified 48 hours prior to commencing work The subsurface will be cleared of underground <br /> tutilities by notifying Underground Service Alert <br />