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u � <br /> Summary of Gauging and Sampling Activities <br /> • October 2005 through December 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 11/11/05 <br /> Sample Points <br /> Groundwater wells 9 onsite, 3 offsite Wells gauged 12 Wells sampled 12 <br /> Purging method Diaphragm 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 14.63 feet Maximum 19.21 feet <br /> Average groundwater elevation (relative to available local datum) -10.81 feet <br /> Average change in groundwater elevation since previous event -0.81 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.002 ft/ft, north <br /> Previous event 0.002 ft/ft, north (08/26/05) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 0 Wells above MCL (1 0 lag/1) n/a <br /> Maximum reported benzene concentration n/a <br /> Wells with TPPH 8260B 1 Maximum- 2,800 Ng/I (MW-3) <br /> Wells with MTBE 4 Maximum 28 pg/l (MW-11) <br /> Wells with TBA 8260B 3 Maximum 24,000 Ng/I (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 />