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Summary of Gauging and Sampling Activities <br /> July 2005 through September 2005 <br /> i Circle K Store 01205 <br /> 16470 Cambridge Street <br /> Lathrop, CA <br /> Project Coordinator: Edward Ralston Water Sampling Contractor: TRC <br /> Telephone: 916-558-7633 Compiled by: Daniel Lee <br /> Date(s) of Gauging/Sampling Event: 07/20/05 <br /> Sample Points <br /> Groundwater wells: 7 onsite, 12 offsite Wells gauged: 19 Wells sampled: 19 <br /> Purging method: Diaphragm pump <br /> Purge water disposal: Onyx/Rodeo Unit 100 <br /> Other Sample Points: 0 Type: n/a <br /> Li uid 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 /> Depth to groundwater (below TOC): Minimum: 9.95 feet Maximum: 14.51 feet <br /> Average groundwater elevation (relative to available local datum): 3.12 feet <br /> . Average change in groundwater elevation since previous event: -0.96 feet <br /> Interpreted groundwater gradient and flow direction: <br /> Current event: *see notes <br /> Previous event: 0.001 ft/ft, northeast (04/27/05) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 6 Wells above MCL (1.0 pg/1): 6 <br /> Maximum reported benzene concentration: 1,500 Ng/I (MW-2) <br /> Wells with TPPH 8260B 9 Maximum: 59,000 pg/1 (MW-1) <br /> Wells with MTBE 4 Maximum: 230 pg/I (MW-16) <br /> Notes: <br /> *Groundwater gradient appears to be radially away from well MW-12 at about 0.015 ft/ft <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 />