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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 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 /> Date(s)sampled 2123104 <br /> Groundwater wells gauged 12 <br /> Groundwater wells sampled 12 <br /> Purging method submersible pump <br /> Treatment/disposal method during sampling event Onyx/Rodeo Unit 100 <br /> Free product pumpouts other than sampling event No <br /> Treatment/Disposal method during free product pumpouts NIA <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) 1 52 <br /> Groundwater gradient and flow direction 0 002 ft/ft north <br /> Previous gradient and/or flow direction(and date) 0 002 ft/ft northeast(11126103) <br /> Groundwater Condition(Benzene Maximum Contaminant Level(MCL]=1 0 Ngll) <br /> Wells with benzene concentrations below MGL 12 <br /> Wells with benzene concentrations at or above MGL 0 <br /> Minimum benzene concentration (ug/1) ND <br /> Maximum benzene concentration(pgll) ND <br /> Minimum MTBE concentration(}ig/I) ND <br /> Maximum MTBE concentration(ug/1) 48(MW-11) <br /> Minimum TPPH concentration(pg11) ND <br /> Maximum TPPH concentration(pg/1) 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 />