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Summary of Gauging and Sampling Activities <br /> January 2004 through March 2004 <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 Coordinator/Phone 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 319104 <br /> Groundwater wells gauged 18 <br /> Groundwater wells sampled 17 <br /> Purging method submersible pump/bailer <br /> Treatment/disposal method during sampling event. Onyx/Rodeo Unrt 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) 3107 <br /> Maximum depth to groundwater(feet bgs) 3343 <br /> Average groundwater elevation(feet relative to mean sea level) -21 19 <br /> Average change in groundwater elevations since previous event(feet) 095 <br /> Groundwater gradient and flow direction 0 004 ft/ft southeast <br /> Previous gradient and/or flow direction(and date) 0 0002 ft/ft,southeast(12/30/03) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL] 1 0 pg/1) <br /> Wells with benzene concentrations below MCL 14 <br /> Wells with benzene concentrations at or above MCL 3 <br /> Minimum benzene concentration(pgA) ND <br /> Maximum benzene concentration(pg1l) 29(MW-16) <br /> Minimum MTBE concentration(pg/1) ND <br /> Maximum MTBE concentration(pgll) 57(MW-15) <br /> Minimum TPPH concentration(pg/l) ND <br /> Maximum TPPH concentration(pgll) 13000(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 /> VW-2=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 sperafic information on this site <br />