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• Summary of Gauging and Sampling Activities <br /> October 2003 through December 2003 <br /> Former 76 Station 6981 <br /> 4707 Pacific Avenue <br /> Stockton, CA <br /> Site Information <br /> Site Former 76 Station <br /> 4707 Pacific Avenue <br /> Stockton,CA <br /> Project CoordinatorlPhone Number Edward Ralston/916-558-7604 <br /> Groundwater wells onsite 15 <br /> Groundwater wells offsite 3 <br /> Field Activity <br /> Sampling consultant TRC <br /> Date(s)sampled 12/30/03 <br /> Groundwater wells gauged 18 <br /> Groundwater wells sampled 16 <br /> Purging method bailerlsubmersible 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) 3196 <br /> Maximum depth to groundwater(feet bgs) 3431 <br /> Average groundwater elevation(feet relative to mean sea level) -2213 <br /> Average change in groundwater elevations since previous event(feel) 042 <br /> Groundwater gradient and flow direction 0 0002 ft/ft, southeast <br /> Groundwater Condibon(Benzene Maximum Contaminant Level[MCL]= 10 pg/l) <br /> Wells with benzene concentrations below MCL 14 <br /> Wells with benzene concentrations at or above MCL 2 <br /> Minimum benzene concentration(pgll) NO <br /> Maximum benzene concentration(pg/1) 32(MW-16) <br /> Minimum MTBE concentration(pgll) NO <br /> Maximum MTBE concentration(pgll) 63 <br /> Minimum TPPH concentration(pg/1) NO <br /> Maximum TPPH concentration(pg/1) 18000(VW-7) <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-1 1=Inaccessible,VW-2=Dry well <br /> iThis 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 />