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Summary of Gauging and Sampling Activities <br /> January 2004 through March 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 CoordinatoriPhone Number- Edward Ralston/916-558-7633 <br /> Groundwater wells onsite 9 <br /> Groundwater wells offsite 3 <br /> Field Activity <br /> Sampling consultant TRC <br /> Date(s)sampled 23104 <br /> 12 <br /> Groundwater wells gauged 1 <br /> Groundwater wells sampled 12 <br /> submersible pump <br /> Purging method <br /> Treatmentidisposal method during sampling event. onyx/Rodeo Unit 104 <br /> Free product pumpouts other than sampling event: No <br /> TreatmentJDisposal method during free product pumpouts N/A <br /> Site Hydrogeology <br /> Minimum depth to groundwater(feet bgs) 1381 <br /> Maximum depth to groundwater(feet bgs) 1771 <br /> Average groundwater elevation(feet relative to mean sea level) -1003 <br /> Average change in groundwater elevations since previous event(feet) 152 <br /> Groundwater gradient and flow directlon 0 402 ft/ft,north <br /> Previous gradient and/or flow direction(and date) 0 002 ft/ft,northeast(11126!03) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL]a 10 Ngll) <br /> Wells with benzene concentrations below MCL 12 <br /> Wells with benzene concentrations at or above MCL. 0 <br /> Minimum benzene concentration(pgn) ND <br /> Maximum benzene concentration(ug1l) ND <br /> Minimum MTBE concentration(ugn) ND <br /> Maximum MTBE Concentration(VgR) 48(MW-11) <br /> Minimum TPPH concentration(NgVl) ND <br /> Maximum TPPH concentration(pgA) 260(MW-11) <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 /> This 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 />