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Summary of Gauging and Sampling Activities <br /> April 2005 through June 2005 <br /> rs` <br /> Former BP Oil 11195 a <br /> 16500 South Interstate 5 <br /> Lathrop, CA 1 <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: 05/25/05, 06/06/05 <br /> Sample Points <br /> Groundwater wells: 8 onsite, 13 offsite Wells gauged: 21 Wells sampled: 21 <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 /> H dro eolo is Parameters <br /> Si <br /> Depth to groundwater (below TOC): Minimum: 7.38 feet Maximum: 11.99 feet }; <br /> Average groundwater elevation (relative to available local datum): n/a feet <br /> Average change in groundwater elevation since previous event: 0.49 feet <br /> Interpreted groundwater gradient and flow direction: <br /> Current event: 0.02 ft/ft, southwest <br /> Previous event: 0.007 ft/ft, southwest (02/15/05) <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 4 Maximum: 150 pg/I (MW-11) <br /> s <br /> Wells with MTBE 17 Maximum: 1,000 pg/I (MW-14) <br /> .f <br /> r <br /> d <br /> Notes: j <br /> r <br /> E' <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 /> 1 <br /> 1 <br />