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0 41 <br /> Summary of Gauging and Sampling Activities <br /> April 2005 through June 2005 <br /> Former 76 Station 6981 <br /> 4707 Pacific Avenue <br /> Stockton, CA <br /> Project Coordinator Shelby Lathrop Water Sampling Contractor TRC <br /> Telephone 916-558-7609 Compiled by Daniel Lee <br /> Date(s) of Gauging/Sampling Event 06/28/05 <br /> Sample Points <br /> Groundwater wells 15 onsite, 3 offsite Wells gauged 18 Wells sampled 17 <br /> Purging method Submersible pump/bailer <br /> Purge water disposal Onyx/Rodeo Unit 100 <br /> Other Sample Points 0 Type n/a <br /> Liquid Phase H drocarbons 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 31.04 feet Maximum 34.81 feet <br /> Average groundwater elevation (relative to available local datum) -21.33 feet <br /> Average change in groundwater elevation since previous event 1.37 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.005 ft/ft, southeast <br /> Previous event 0.004 ft/ft, southeast (03/24/05) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 4 Wells above MCL (1 0 fag/1) 3 <br /> Maximum reported benzene concentration 9.0 pg/I (MW-16) <br /> Wells with TPH-G 3 Maximum 7,400 pg/I (VW-7) <br /> Wells with MTBE 2 Maximum 22 pg/I (MW-16) <br /> I <br /> Notes: <br /> VW-2=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 />