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,lig i1�1 <br /> • Summary of Gauging and Sampling Activities <br /> April 2004 through June 2004 <br /> Former BP Oil 11192 <br /> 1403 Country Club Boulevard <br /> Stockton, CA <br /> Site Information <br /> Site Former BP Oil <br /> 1403 Country Club Boulevard <br /> Stockton CA <br /> Project Coordinator/Phone Number Edward Ralston/916-558-7633 <br /> Groundwater wells onsite 9 <br /> Groundwater wells offsite 3 <br /> Field Activity <br /> Sampling consultant TRC <br /> Dale(s)sampled 05/21/44 <br /> Groundwater wells gauged 12 <br /> Groundwater wells sampled 12 <br /> Purging method diaphragm/submersible pump <br /> Treatment/disposal method during sampling event Onyx/Rodeo Unit 100 <br /> Free product pumpouts other than sampling event No <br /> Treatment/Dtsposal method during free product pumpouts NIA <br /> • Site Hydrogeology <br /> Minimum depth to groundwater(feet bgs) 1348 <br /> Maximum depth to groundwater(feet bgs) 1876 <br /> Average groundwater elevation(feet relative to mean sea level) -975 <br /> Average change in groundwater elevations since previous event(feet) 028 <br /> Groundwater gradient and flow direction 0 002 ft/ft north <br /> Previous gradient and/or flow direction(and date) 0 002 ft/ft, north (02123104) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL]_ 10 yg/q <br /> Wells with benzene concentrations below MCL 12 <br /> Wells with benzene concentrations at or above MCL 0 <br /> Minimum benzene concentration(pg/1) ND <br /> Maximum benzene concentration(pgll) ND <br /> Minimum MTBE concentration (pg11) ND <br /> Maximum MTBE concentration (Vg/1) 28 <br /> Minimum TPPH concentration(pgll) ND <br /> Maximum TPPH concentration(pg/1) 51 (MW-4) <br /> Groundwater wells with free product 0 <br /> Minimum free product thickness(feet) 0 <br /> Maximum free product thickness(feet) 0 <br /> Additional Information <br /> iThis report presents the results of groundwater monitoring and sampling activities performed by TRC Please contact the <br /> primary consultant for other specific information on this site <br />