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• Summary of Gauging and Sampling Activities <br /> October 2003 through December 2003 <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 9 <br /> Groundwater wells offslte 7 <br /> Field Activity- <br /> Sampling <br /> ctivitySampling consultant TRC <br /> Date(s)sampled 1019/03 <br /> Groundwater wells gauged 16 <br /> Groundwater wells sampled 16 <br /> Purging method diaphragm/submersible pump <br /> TreatmenVdisposal method during sampling event OnyxlRodeo Unit 100 <br /> Free product pumpouts other than sampling event. No <br /> TreatmenVDisposel method during free product pumpouts NIA <br /> . Site Hydrogeology <br /> Minimum depth to groundwater(feet bgs) 1265 <br /> Maximum depth to groundwater(feet bgs) 1639 <br /> Average groundwater elevation(feet relative to mean sea level) 149 <br /> Average change in groundwater elevations since previous event(feet) -130 <br /> Groundwater gradient and flow direction 0 002 Wit,northeast <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL)=1 0 pgA) <br /> Wells with benzene concentrations below MCL 11 <br /> Wells with benzene concen-trations at or above MCL 5 <br /> Minimum benzene concentration(pgfi) ND <br /> Maximum benzene concentration(pq/I) 79(MW-5) <br /> Minimum MTBE concentration(NgA) ND <br /> Maximum MTBE concentration(pgA) 540 <br /> Minimum TPPH concentration(jig/1) ND <br /> Maximum TPPH concentration(pgA) 27000(MW-9) <br /> Groundwater wells with free product 0 <br /> Minimum free product thickness(feet) 0 <br /> Maximum free product thickness(feet) 0 <br /> Additional I nformatlon <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 />