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li jy i <br /> Summary of Gauging and Sampling Activities <br /> i January 2005 through March 2005 <br /> Former 76 Station 6981 <br /> 4707 Pacific Avenue <br /> Stockton, CA <br /> Pro)ect Coordinator Shelby Lathrop Water Sampling Contractor TRC <br /> Telephone 916-558-7609 Compiled by Christina Carrillo <br /> Date(s) of Gauging/Sampling Event 03/24/05 <br /> Sample Points <br /> Groundwater wells 15 onsite, 3 offsite Wells gauged 18 Wells sampled 15 <br /> Purging method Sailer/submersible pump <br /> Purge water disposal Onyx/Rodeo Unit 100 <br /> Other Sample Points 0 Type n/a <br /> Li uid Phase Hydrocarbons LPH <br /> Wells with LPH 0 Maximum thickness (feet) n/a <br /> LPH removal frequency n/a Method n/a <br /> Treatment or disposal of water/LPH n/a <br /> Hydrogeologic Parameters <br /> Depth to groundwater (below TOC) Minimum 32.5 feet Maximum 35 feet <br /> Average groundwater elevation (relative to available local datum) -22.73 feet <br /> Average change in groundwater elevation since previous event 1.41 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.004 ft/ft, southeast <br /> Previous event 0.004 ft/ft, southeast (12/30/04) <br /> Selected Laboratory Results _ <br /> Wells with detected Benzene: 1 Wells above MCL (1 0 pg/1) 1 <br /> Maximum reported benzene concentration 18 pg/I (MW-16) <br /> Wells with TPH-G 2 Maximum 470 pg/I (VW-4) <br /> Wells with MTBE 6 Maximum 18 pg/l (MW-16) <br /> Notes: <br /> MW-11=Bent casing, grab sample collected, VW-2=Dry well, VW-3=Dry well, VW-7=Dry well, <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 />