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Summary of Gauging and Sampling Activities <br /> October 2005 through December 2005 <br /> .{ Former BP Oil 11195 <br /> 16500 South interstate 5 <br /> Lathrop, 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: 10/25/05 <br /> Sample Points <br /> Groundwater wells: 8 onsite, 16 offsite Wells gauged: 22 Wells sampled: 22 <br /> Purging method: Diaphragm pump/bailer <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: 8.16 feet Maximum: 12.69 feet <br /> Average groundwater elevation (relative to available local datum): 3.09 feet <br /> Average change in groundwater elevation since previous event: -0.52 feet <br /> Interpreted groundwater gradient and flow direction: <br /> Current event: 0.008 ft/ft, southwest <br /> Previous event: *see notes (08/31/05) <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 8260B 2 Maximum: 150 pg/I (MW-3) <br /> Wells with MTBE 13 Maximum: 47 pg/I (MW-16) <br /> Notes: <br /> *Previous groudwater gradient is variable. <br /> MW-14=Casing damaged, MW-21=Paved over, <br /> I <br /> i <br /> I <br /> i <br /> I <br /> i <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 /> i <br /> i <br />