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f <br /> Summary of Gauging and Sampling Activities <br /> October 2006 through December 2006 <br /> Circle K Store 01205 t <br /> 16470 Cambridge Street <br /> Lathrop, CA <br /> Project Coordinator: Edward Ralston Water Sampling Contractor: TRC <br /> Telephone: 916-558-7633 Compiled by: Allan Ramirez <br /> Date(s) of Gauging/Sampling Event: 12/07/06 <br /> Sample Points <br /> s <br /> Groundwater wells: 9 onsite, 14 offsite Wells gauged: 22 Wells sampled: 22 <br /> Purging method: Diaphragm/submersible pump/bailer <br /> Purge water disposal: Onyx/Rodeo Unit 100 <br /> Other Sample Points: 0 Type: n/a <br /> s: <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 /> F <br /> Hydrogeologic Parameters <br /> t: <br /> Depth to groundwater (below TOC): Minimum: 9.97 feet Maximum: 14.67 feet <br /> R' <br /> Average groundwater elevation (relative to available local datum): 3.65 feet K <br /> Average change in groundwater elevation since previous event: -0.08 feet ' <br /> Interpreted groundwater gradient and flow direction: {: <br /> Current event: 0.001 ft/ft, north <br /> Previous event: 0.001 ft/ft, northeast (08/14/06) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 8 Wells above MCL (1.0 fig/1): 7 <br /> Maximum reported benzene concentration: 32 pg/l (MW-1) <br /> Wells with TPH-G by GC/MS 10 Maximum: 23,000 pg/I (MW-5) 3 <br /> Wells with MTBE 5 Maximum: 80 Pg/I (MW-12) <br /> y:. <br /> Notes." <br /> z <br /> MW-16=Patched over, <br /> tt <br /> s <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 /> 3 <br />