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Summary of Gauging and Sampling Activities <br /> July 2005 through September 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 08/26/05 <br /> Sample Points <br /> Groundwater wells 9 onsite, 3 offsite Wells gauged 11 Wells sampled. 11 <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 T <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 13.77 feet Maximum 19.25 feet <br /> Average groundwater elevation (relative to available local datum) -10.01 feet <br /> • Average change in groundwater elevation since previous event -1.69 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.002 ft/ft, north <br /> Previous event- 0.002 ft/ft, northeast (05/27/05) <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 82608 2 Maximum 370 pg/11 (MW-11) <br /> Wells with MTBE 8 Maximum 29 pg/I (MW-11) <br /> Wells with TBA 82608 4 Maximum 29,000 pg/I (MW-7) <br /> Notes: <br /> MW-8=Street closure, <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 />