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K�.1 '11 Yi <br /> Summary of Gauging and Sampling Activities <br /> . October 2004 through December 2004 <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: Christina Carrillo <br /> Date(s) of Gauging/Sampling Event: 10/13/04 <br /> Sample Points <br /> Groundwater wells: 7 onsite, 9 offsite Wells gauged: 16 Wells sampled: 16 <br /> Purging method: Diaphragm pump <br /> Purge water disposal: Onyx/Rodeo Unit 100 <br /> Other Sample Points: 0 Type: n/a <br /> Lf 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: 13.35 feet Maximum: 17.3 feet <br /> Average groundwater elevation (relative to available local datum): 0.83 feet <br /> Average change in groundwater elevation since previous event: -2.05 feet <br /> Interpreted groundwater gradient and flow direction: <br /> Current event: 0.005 ft/ft, northeast <br /> Previous event: 0.006 ft/ft, northeast (07/19/04) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 5 Wells above MCL (1.0 pg/1): 5 <br /> Maximum reported benzene concentration: 150 Ng/I (MW-6) <br /> Wells with TPPH 82606 10 Maximum: 12,000 N9/1 (MW-6) <br /> Wells with MTBE 6 Maximum: 420 p9/1 (MW-16) <br /> Notes: <br /> ,S 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 />