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I <br /> fl {A1 <br /> Summary of Gauging and Sampling Activities <br /> April 2004 through June 2004 <br /> Circle K Store 01205 <br /> 16470 Cambridge Street <br /> Lathrop, CA <br /> Site Information <br /> Site Circle K Store <br /> 16470 Cambridge Street <br /> Lathrop CA <br /> Project Coordinator/Phone Number Edward Ralston/916-55$-7633 <br /> Groundwater wells onsite 7 <br /> Groundwater wells offsite 9 <br /> Field Activity <br /> Sampling consultant TRC <br /> Date(s)sampled 4/27/2004 <br /> Groundwater wells gauged 16 <br /> Groundwater wells sampled 16 <br /> Purging method diaphragm pump <br /> Treatment/disposai 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) 1059 <br /> Maximum depth to groundwater(feet bgs) 1355 <br /> Average groundwater elevation (feet relative to mean sea level) 421 <br /> Average change in groundwater elevations since previous event(feet) 100 <br /> Groundwater gradient and flow direction 0 005 ft/ft northeast <br /> Previous gradient and/or flow direction (and date) 0 002 ft/ft, northeast(1/26/2004) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL]=1 0 lig/0 <br /> Wells with benzene concentrations below MCL 9 <br /> Wells with benzene concentrations at or above MCL 7 <br /> Minimum benzene concentration(Ng/l) ND <br /> Maximum benzene concentration(jig/1) 160(MW-1) <br /> Minimum MTBE concentration(pg/1) ND <br /> Maximum MTBE concentration (pg/1) 350(MW-12) <br /> Minimum TPPH concentration(pg/1) ND <br /> Maximum TPPH concentration(jig/1) 52000(MW-5) <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 />