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•' r <br /> S Summary of Gauging and Sampling Activities <br /> January 2004 through March 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 Edward Ralston/916-558-7633 <br /> Groundwater wells onsite 11 <br /> Groundwater wells offsite 9 <br /> Field Activity <br /> Sampling consultant TRC <br /> Date(s)sampled 2111!04 <br /> Groundwater wells gauged 20 <br /> Groundwater wells sampled 20 <br /> Purging method diaphragm/submersible 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) 543 <br /> Maximum depth to groundwater(feet bgs) 874 <br /> Average groundwater elevation(feet relative to mean sea level) -657 <br /> Average change in groundwater elevations since previous event(feet) 028 <br /> Groundwater gradient and flow direction 0 002 ft/ft,southwest <br /> Previous gradient and/or flow direction(and date) 0 003 ft/ft southwest(11120/03) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL]=1 0 pg/1) <br /> Wells with benzene concentrations below MCL 20 <br /> Wells with benzene concentrations at or above MCL 0 <br /> Minimum benzene concentration(pg/1) ND <br /> Maximum benzene concentration(pg/1) 0 52(MW-81) <br /> Minimum MTBE concentration(pg/1) ND <br /> Maximum MTBE concentration(pgll) 2100(MW-1) <br /> Minimum TPPH concentration (pg/1) ND <br /> Maximum TPPH concentration(pgA) 1500(MW-1) <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 /> 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 />