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n7 <br /> . Summary of Gauging and Sampling Activities <br /> January 2004 through March 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/916-558-7633 <br /> Groundwater wells onsite 7 <br /> Groundwater wells offsite 9 <br /> Field Activity <br /> Sampling consultant TRC <br /> Date(s)sampled 1126104 <br /> Groundwater wells gauged 16 <br /> Groundwater wells sampled 16 <br /> Purging method diaphragm pump <br /> Treatment/disposal method during sampling event Onyx/Rodeo Unit 100 <br /> Free product pumpouts other than sampling event No <br /> TreatmentlDisposal method during free product pumpouts NIA <br /> Site Hydrogeotogy <br /> Minimum depth to groundwater(feet bgs) 1083 <br /> Maximum depth to groundwater(feet bgs) 1515 <br /> Average groundwater elevation(feet relative to mean sea level) 321 <br /> Average change in groundwater elevations since previous event(feet) 171 <br /> Groundwater gradient and flow direction 0 002 ft/ft,northeast <br /> Previous gradient and/or flow direction(and date) 0 002 ft/ft,northeast(10/9/03) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL] 10 Ng/1) <br /> Wells with benzene concentrations below MCL i l <br /> Wells with benzene concentrations at or above MCL 5 <br /> Minimum benzene concentration(ug/1) ND <br /> Maximum benzene concentration(ug/l) 560(MW-2) <br /> Minimum MTBE concentration(jag/1) ND <br /> Maximum MTBE concentration(pgA) 750 <br /> Minimum TPPH concentration(pgll) ND <br /> Maximum TPPH concentration(jag/!) 23000(MW-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 /> 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 />