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Summary of Gauging and Sampling Activities <br /> October 2005 through December 2005 <br /> 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: 10/05/05 <br /> Sam le Points <br /> Groundwater wells: 7 onsite, 12 offsite Wells gauged: 19 Wells sampled: 19 <br /> Purging method: Diaphragm/submersible pump <br /> Purge water disposal: Onyx/Rodeo Unit 100 <br /> Other Sample Points: 0 Type: n/a <br /> Liquid Phase H drocarbons 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 Bolo is Parameters <br /> Depth to groundwater (below TOC): Minimum: 11.83 feet Maximum: 15.66 feet <br /> Average groundwater elevation (relative to available local datum): 2.10 feet <br /> Average change in groundwater elevation since previous event: -1.02 feet <br /> Interpreted groundwater gradient and flow direction: <br /> Current event: 0.002 ft/ft, northeast <br /> Previous event: *see notes (07/20/05) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 5 Wells above MCL (1.0 lag/1): 5 <br /> Maximum reported benzene concentration: 420 Ng/I (MW-1). <br /> Wells with TPPH 82606 13 Maximum: 22,000 Ng/1 (MW-9) <br /> Wells with MTBE 4 Maximum: 520 Ng/l (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 perforrned by TRC. Please contact the <br /> primary consultant for other specific information on this site. <br />