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Summary of Gauging and Sampling Activities <br /> July 2004 through September 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, 09/20/04 <br /> Sample-Points <br /> Groundwater wells: 15 onsite, 3 offsite Wells gauged, 18 Wells sampled: 11 <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 /> Hydrogeologlc Parameters <br /> Depth to groundwater(below TOC), Minimum, 34.42 feet Maximum, 39.29 feet <br /> Average groundwater elevation (relative to available local datum)- -24.99 feet <br /> Average change in groundwater elevation since previous event, -3.22 feet <br /> Interpreted groundwater gradient and flow direction. <br /> Current event, 0.005 ft/ft, southeast <br /> Previous event: 0.004 ft/ft, southeast(06/16/04) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 1 Wells above MCL (1.0 fig/l)• 1 <br /> Maximum reported benzene concentration: 4.4 pg/l (MW-2) <br /> Wells with TPH-G 2 Maximum 8,500 pg/I (VW-7) <br /> Wells with MTBE 2 Maximum. 1.8 pg/l (MW-9) <br /> Notes: <br /> MW-11=unable to sample casing bent, MW-14=Drywell, MW-15=Drywell, MW-16=Drywell,VW- <br /> 2=Dry well,VW-3=Dry well,VW-4=Dry well, <br /> I <br /> This report presents the results of groundwater monitoring and sampling activities performed by TRC Please contact the <br /> pnmery consultant for other specific informatlon on this site <br />