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Summary of Gauging and Sampling Activities <br /> October 2004 through December 2004 <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 Christina Carrillo <br /> Date(s) of Gauging/Sampling Event: 12/30/04 <br /> Sample Points <br /> Groundwater wells 15 onsite, 3 offsite Wells gauged: 18 Wells sampled: 14 <br /> Purging method: Bailer/submersible pump <br /> Purge water disposal: Onyx/Rodeo Unit 100 <br /> Other Sample Points 0 Type n/a <br /> Liquid 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 /> H dro eolo is Parameters <br /> Depth to groundwater (below TDC)- Minimum* 33.91 feet Maximum 36.35 feet <br /> Average groundwater elevation (relative to available local datum): -24.13 feet <br /> Average change in groundwater elevation since previous event. 0.94 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.004 ft/ft, southeast <br /> Previous event. 0.005 ft/ft, southeast(09/20/04) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 5 Wells above MCL (1.0 pg/I)• 3 <br /> Maximum reported benzene concentration. 10 pg/I (MW-16) <br /> Wells with TPH-G 4 Maximum- 6,800 pg/l (VW-7) <br /> Wells with MTBE 4 Maximum: 30 pg/I (MW-15) <br /> Notes: <br /> MW-11=unable to sample-casing bent,VW-2=Drywell,VW-3=Drywell,VW-4=Drywell, <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 />