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-G it, <br /> Summary of Gauging and Sampling Activities <br /> 0 January 2005 through March 2005 <br /> Former BP Oil 11192 <br /> 1403 Country Club Boulevard <br /> Stockton, CA <br /> Project Coordinator Liz Sewell Water Sampling Contractor TRC <br /> Telephone 916-558-7604 Compiled by Christina Carrillo <br /> Date(s) of Gauging/Sampling Event 02/25/05 <br /> Sample Points <br /> Groundwater wells 9 onsite, 3 offsite Wells gauged 12 Wells sampled 12 <br /> Purging method Diaphragm/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 /> Hydrogeologic Parameters <br /> Depth to groundwater (below TOC) Minimum 13.15 feet Maximum 17.71 feet <br /> Average groundwater elevation (relative to available local datum) -9.47 feet <br /> Average change in groundwater elevation since previous event 1.93 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.003 ft/ft, northeast <br /> Previous event 0.002 ft/ft, north (11/24/04) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 0 Wells above MCL (1 0 pg/1) n/a <br /> Maximum reported benzene concentration n/a <br /> Wells with TPPH 8260B 0 <br /> Wells with MTBE 2 Maximum 2.7 pg/I (MW-4) <br /> Wells with TBA 8260B 3 Maximum 43,000 pg/l (MW-7) <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 />