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Summary of Gauging and Sampling Activities <br /> October 2003 through December 2003 <br /> Former BP Oil 11195 <br /> 16500 South Interstate 5 <br /> Lathrop, CA <br /> Site Information: <br /> Site: Former BP Oil <br /> 96500 South Interstate 5 <br /> Lathrop,CA <br /> Project Coordinator/Phone Number: Edward Ralston/916-558-7633 <br /> Groundwater wells onsite: 8 <br /> Groundwater wells offsite; 13 <br /> Field Activity: <br /> Sampling consultant: TRC <br /> Date(s)sampled: 11/24103 <br /> Groundwater wells gauged: 20 <br /> Groundwater wells sampled: 20 <br /> Purging method: diaphragm pump <br /> Treatment/disposal method during sampling event: Onyx/Rodeo Unit 100 <br /> Free product pumpouts other than sampling event: No <br /> TreatmentlDlsposal method during free product pumpouts: NIA <br /> Site Hydrogeology: <br /> Minimum depth to groundwater(feet bgs): 8.21 <br /> Maximum depth to groundwater(feet bgs): 12.45 <br /> Average groundwater elevation(feet relative to mean sea level): 3,18 <br /> Average change In groundwater elevations since previous event(feet): 0.25 <br /> Groundwater gradient and flow direction: 0.0014 ftfft,south <br /> .Groundwater Condition(Benzene Maximum Contaminant Level[MCL]=1.0 pg1l) <br /> Wells with benzene concentrations below MCL: 20 <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(pgll): ND <br /> Maximum MTBE concentratlon(pgll): 2600 <br /> Minimum TPPH concentration(pgll): ND <br /> Maximum TPPH concentration(pgli): 2400(MW-5) <br /> Groundwater wells with free product: 0 <br /> Minimum free product thickness(feel); 0 <br /> Maximum free product thickness(feet): 0 <br /> -Additional Information: <br /> MW-13=Destroyed, <br /> i <br /> I 1 This report presents the results of groundwater monitoring and sampling activities performed by TRC. Please contact the <br /> primary consultant for other speciflc Information on this site. <br /> i <br />