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Summary of Gauging and Sampling Activities <br /> . . .,� October 2004 through December 2004 <br /> Former BP Oil 11195 <br /> 16500 South Interstate 5 <br /> Lathrop, 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: 11/29/04 <br /> Sample Points <br /> Groundwater wells: 8 onsite, 13 offsite Wells gauged: 20 Wells sampled: 18 <br /> Purging method: Bailer/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: 9,18 feet Maximum: 13.59 feet <br /> Average groundwater elevation (relative to available local datum): 2.19 feet <br /> Average change in groundwater elevation since previous event: -0.41 feet <br /> --- Interpreted groundwater gradient and flow direction: <br /> Current event: 0.006 ft/ft, southwest <br /> Previous event: 0.02 ft/ft, south (08/26/04) <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 11 Maximum: 1,100 pg/I (MW-16) <br /> Wells with MTBE 16 Maximum: 1,400 pg/1 (MW-16) <br /> Notes: <br /> CC-WS=Dry well, MW-14=unable to sample-well bent, MW-21=Covered with asphalt, <br /> i� This report presents the results of groundwater monitoring and sampling acUvitles performed by TRC. Please contact the <br /> primary consultant for other specific information on this site. <br />