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f Summary of Gauging and Sampling Activities <br /> April 2004 through June 2004 <br /> Former BP Oil 11195 <br /> 16500 South Interstate 5 <br /> Lathrop, CA <br /> Site Information: <br /> Site: Former BP Oil <br /> 16500 South Interstate 5 <br /> Lathrop,CA <br /> Project Coordinator/Phone Number: Edward Ralston1916-558-7633 <br /> Groundwater wells onsite: 8 <br /> Groundwater wells offsite: 13 <br /> Field Activity: <br /> Samplingr-onsultant: TRC <br /> Date(s)sampled: 5/21/2004 <br /> Groundwater wells gauged: 20 <br /> Groundwater wells sampled: 20 <br /> Purging method: diaphragm/sub pump/bailer <br /> Treatment/disposal method during sampling event: Onyx/Rodeo Unit 100 <br /> Free product pumpouts other than sampling evenl: No <br /> Treatment/Disposal method during free product pumpouts: NIA <br /> Site Hydrogeology: <br /> Minimum depth to groundwater(feet bgs): 8.11 <br /> Maximum depth to groundwater(feet bgs): 12.6 <br /> Average groundwater elevation(feet relative to mean sea level): 3.17 <br /> Average change in groundwater elevations since previous event(feet): -0.78 <br /> Groundwater gradient and flow direction: 0.006 ft/ft,South <br /> Previous gradient and/or flow direction(and date): 0.002 ft/ft,south(212612004) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL]= 1.0 pg/1) <br /> Wells with benzene concentrations below MCI.: 20 <br /> Wells with benzene concentrations at or above MCL: 0 <br /> Minimum benzene concentration(lag/1): ND <br /> Maximum benzene concentration(ug/1): ND <br /> Minimum MTBE concentration(pglt): ND <br /> Maximum MTBE concentration(pgll): 2400 <br /> Minimum TPPH concentration(pg/1): ND <br /> Maximum TPPH concentration(pg/1): 1400(MW-14) <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 /> MW-13Anaccessible, <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 /> E <br />