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Summary of Gauging and Sampling Activities <br /> July 2005 through September 2005 <br /> 76 Station 5886 <br /> 2701 West March Lane <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 08/22/05 <br /> Sample Points <br /> Groundwater wells 11 onsite, 9 offsite Wells gauged 20 Wells sampled 20 <br /> Purging method Diaphragm pump/bailer <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 TOC). Minimum 6.15 feet Maximum 9.08 feet <br /> Average groundwater elevation (relative to available local datum). -7.10 feet <br /> Average change in groundwater elevation since previous event. -0.56 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.003 ft/ft, southwest <br /> Previous event 0.005 ft/ft, southwest (06/06/05) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 1 Wells above MCL (1 0 dig/I)• 0 <br /> Maximum reported benzene concentration 0.14 pg/I (MW-6S) <br /> Wells with TPH-G 6 Maximum, 160 pg/I (MW-1) <br /> Wells with MTBE 11 Maximum 160 pg/I (MW-1) <br /> Notes: <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 />