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1 � <br /> Summary of Gauging and Sampling Activities <br /> April 2004 through June 2004 <br /> Former 76 Station 6981 <br /> 4707 Pacific Avenue <br /> Stockton, CA <br /> Sde Information <br /> Site Former 76 Station <br /> 4707 Pacific Avenue <br /> Stockton,CA <br /> Protect Coordinator/Phone Number Shelby Lathrop/916-558-7609 <br /> Groundwater wells onsite 15 <br /> Groundwater wells offsite 3 <br /> Field Act" <br /> Sampling consultant TRC <br /> Date(s)sampled 06/16/04 <br /> Groundwater wells gauged 18 <br /> Groundwater wells sampled 15 <br /> Purging method bailer/sub/diaphragm 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 /> Sde Hydrogeology <br /> l� Minimum depth to groundwater(feet bgs) 3167 <br /> Maximum depth to groundwater(feet bgs) 3543 <br /> Average groundwater elevation(feet relative to mean sea level) -2198 <br /> Average change in groundwater elevations since previous event(feet) -079 <br /> Groundwater gradient and flow direction 0 004 ft/ft,southeast <br /> Previous gradient and/or flow direction(and date) 0 004 fUft,southeast(03109104) <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 MCL 3 <br /> Minimum benzene concentration(pg/1) ND <br /> Maximum benzene concentration(pg/1) 35(MW-16) <br /> Minimum MTBE concentration(pg/1) ND <br /> Maximum MTBE concentration(pg/1) 38 <br /> Minimum TPPH concentration(po) ND <br /> Maximum TPPH concentration(pgll) 91000(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-11=Damaged Well,VW-2=Dry well VW-3=Dry well <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 />