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Summary of Gauging and Sampling Activities <br /> April 2005 through June 2005 <br /> Former BP Oil 11192 <br /> 1403 Country Club Boulevard <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 5/27/2005 <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 12.01 feet Maximum 16.73 feet <br /> Average groundwater elevation (relative to available local datum) -8.28 feet <br /> Average change in groundwater elevation since previous event 1.19 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.002 ft/ft, northeast <br /> Previous event 0.003 ft/ft, northeast (2/25/2005) <br /> Selected Laboratory Results _ <br /> Wells with detected Benzene: 1 Wells above MCL (1 0 pg/1) 0 <br /> Maximum reported benzene concentration 0.65 pg/l (MW-12) <br /> Wells with TPPH 82608 0 <br /> Wells with MTBE 5 Maximum 21 pg/l (MW-11) <br /> Wells with TBA 8260B 4 Maximum 30,000 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 />