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__ _ _ _ <br /> � N <br /> Summary of Gauging and Sampling Activities <br /> January 2005 through March 2005 <br /> Former BP Oil 11195 <br /> 16500 South Interstate 5 k' <br /> Lathrop, CA <br /> Project Coordinator: Liz Sewell Water Sampling Contractor: TRC <br /> Telephone: 916-558-7604 Compiled by: Christina Carrillo <br /> Date(s) of Gauging/Sampling Event: 02/15/05, 03/24/05 <br /> Sample Points <br /> Groundwater wells: 8 onsite, 13 offsite Wells gauged: 21 Wells sampled: 20 <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 /> H dro eolo is Parameters <br /> a' <br /> Depth to groundwater (below TOC): Minimum: 7.96 feet Maximum: 12.43 feet <br /> Average groundwater elevation (relative to available local datum): 3.40 feet <br /> Average change in groundwater elevation since previous event: 1.18 feet <br /> Interpreted groundwater gradient and flow direction: <br /> Current event: 0.007 ft/ft, southwest <br /> Previous event: 0,006 ft/ft, southwest (11/29/04) <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 82608 1 Maximum: 92 Ng/I (MW 3) <br /> Wells with MTBE 15 Maximum: 420 pg/I (MW-9) <br /> Notes: <br /> 3 <br /> MW-14=Well damage, <br /> �i <br /> This report presents the results of groundwater monitoring and sampling activities performed by TFCC. Please contact the <br /> primary consultant for other specific information on this site. <br /> i' <br /> �I <br /> r <br /> r. <br /> r, <br />