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ri 9 <br /> JI 1 <br /> . Summary of Gauging and Sampling Activities <br /> April 2004 through June 2004 <br /> 76 Station 5886 <br /> 2701 West March Lane <br /> Stockton, CA <br /> Site Information <br /> Site 76 Station <br /> 2701 West March Lane <br /> Stockton CA <br /> Project Coordinator/Phone Number Shelby Lathrop/916-558-7609 <br /> Groundwater wells onsite 1 i <br /> Groundwater wells offsite 9 <br /> I <br /> Field Activity <br /> Sampling consultant TRC <br /> Date(s)sampled 05/27/04 <br /> Groundwater wells gauged 16 <br /> Groundwater wells sampled 11 <br /> Purging method diaphrag misubmersible 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) 574 <br /> Maximum depth to groundwater(feet bgs) 886 <br /> Average groundwater elevation(feet relative to mean sea level) -664 <br /> Average change in groundwater elevations since previous event(feet) -015 <br /> Groundwater gradient and flow direction 0 008 Rift southwest <br /> Previous gradient and/or flow direction(and date) 0 002 ftlft, southwest(02111104) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL]= 1 0 Ngfl) <br /> Wells with benzene concentrations below MCL 11 <br /> Wells with benzene concentrations at or above MCL 0 <br /> Minimum benzene concentration(pg/1) ND <br /> Maximum benzene concentration(pg/1) ND <br /> Minimum MTBE concentration(pgll) ND <br /> Maximum MTBE concentration(pg/1) 490 <br /> Minimum TPPH concentration(pg/1) ND <br /> Maximum TPPH concentration (pg11) 100(MW-2) <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-5D=Monitored Only MW-5S=Monitored Only MW-7D=Monitored Only MW-7S=Monitored Only, MW-81=Sampled Semi- <br /> Annually MW-8S=Sampled Semi-Annuaily MW-9D=Monitored Only MW-91=Sampled Semi-Annually, MW-9S=Sampled <br /> Semi-Annually <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 />