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Summary of Gauging and Sampling Activities <br /> January 2004 through March 2004 <br /> Former BP Oil 11995 <br /> 16500 South Interstate 5 <br /> Lathrop, CA <br /> Site Information: <br /> Site: Former BP OA <br /> 16500 South Interstate 5 <br /> Lathrop,CA <br /> Project CoordlnatorlPhone Number: Edward Ralston/916-558-7633 <br /> Groundwater wells onsite: 8 <br /> Groundwater wells offsite: 13 <br /> Field Activity: <br /> Sampling consultant: TRC <br /> Date(s)sampled: 2126104 <br /> Groundwater wells gauged: 20 <br /> Groundwater wells sampled: 20 <br /> Purging method: dlaphragm pump/bailer <br /> Treatmentfdisposal 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): 7.34 <br /> Maximum depth to groundwater(fleet bgs): 11.72 <br /> Average groundwater elevatlon(feet relative to mean sea level). 3.94 <br /> Average change In groundwater elevations since previous event(feet): 0.76 <br /> Groundwater gradient and flow direction: 0.002 MR,south <br /> Previous gradient and/or flow direction(and date): 0.0014 fti t,south(11124103) <br /> Groundwater Condition(Benzene Maximum Contaminant Level[MCL]=1.0 pg1l) <br /> Wells with benzene concentrations below MCL: 20 <br /> Wells with benzene concentrations at or above MCL: 0 <br /> Minimum benzene concentration(}rgA): ND <br /> Maximum benzene concentration(>1g/1); ND <br /> Minimum MTBE concentration(pgft ND <br /> Maximum MTBE concentration(pg/l): 1800(MW-5) <br /> Minimum TPPH concentration(ug/l): ND <br /> Maximum TPPH concentration(pgA): 1500(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 /> i <br /> MW 13=1naccesslble, <br /> This report presents the results of groundwater monitoring and sampling actIvitles performed by TRC. Please contact the <br /> i ,:: primary consultant for other speclflc Information on this site. _ <br />