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of u <br /> Summary of Gauging and Sampling Activities <br /> October 2004 through December 2004 <br /> Former BP Oil 11192 <br /> 1403 Country Club Boulevard <br /> Stockton, CA <br /> Project Coordinator Edward Ralston Water Sampling Contractor TRC <br /> Telephone 916-558-7633 Compiled by Christina Carrillo <br /> Date(s) of Gauging/Sampling Event 11/24/04 <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 /> Li uid 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 Bolo is Parameters <br /> Depth to groundwater (below TOC) Minimum. 15.24 feet Maximum 16.2 feet <br /> Average groundwater elevation (relative to available local datum) -11.22 feet <br /> . Average change in groundwater elevation since previous event -0.56 feet <br /> Interpreted groundwater gradient and flow direction. <br /> Current event 0.002 ft/ft, north <br /> Previous event 0.002 ft/ft, north (08/10/04) <br /> Selected Laboratog 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 82606 1 Maximum 54 pg/1 (MW-4) <br /> Wells with MTBE 1 Maximum 5.4 Ng/I (MW-4) <br /> Wells with TBA 82608 5 Maximum 75,000 pg/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 />