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Summary of Gauging and Sampling Activities <br /> July 2005 through September 2005 <br /> Circle K Store 08671 <br /> 8606 Thornton Road <br /> Stockton, 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 08/23/05 <br /> Sample Points <br /> Groundwater wells 7 onsite, 3 offsite Wells gauged 10 Wells sampled 10 <br /> Purging method Submersible pump/bailer <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/LPN n/a <br /> H dro eolo is Parameters <br /> Depth to groundwater (below TOC) Minimum 33.62 feet Maximum 36.56 feet <br /> Average groundwater elevation (relative to available local datum) -21.83 feet <br /> Average change in groundwater elevation since previous event -3.23 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event. *see notes <br /> Previous event **see notes below (04/18/05) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 0 Wells above MCL (1 0 dig/1) n/a <br /> Maximum reported benzene concentration n/a <br /> Wells with TPPH 8260B 4 Maximum 170 Ng/l (MW-4) <br /> Wells with MTBE 5 Maximum, 4,200 pg/I (MW-4) <br /> Notes: <br /> *Groundwater gradient 0 003 ft/ft east(shallow), 0 003 ft/ft northeast (deep) "Previous groundwater <br /> gradient 0 009 fVft east(shallow), 0 009 tuft east(deep) <br /> This report presents the results of groundwater monitoring and sampling activities performed by TRC Please contact the <br /> primary consultant for outer specific information on this site <br />