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[M fl <br /> Summary of Gauging and Sampling Activities <br /> . April 2005 through June 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 04/18/05 <br /> Sample Points <br /> Groundwater wells 7 onsite, 3 offsite Wells gauged 10 Wells sampled 10 <br /> Purging method Submersible pump <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/LPH n/a <br /> Hydrogeologic Parameters <br /> Depth to groundwater (below TOC) Minimum 30.64 feet Maximum 33.12 feet <br /> Average groundwater elevation (relative to available local datum) -18.60 feet <br /> Average change in groundwater elevation since previous event 2.67 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event **see notes below <br /> Previous event *see notes below (01/26/05) <br /> Selected Laboratory Results _ <br /> Wells with detected Benzene: 0 Wells above MCL (1 0 pg/1) n/a <br /> Maximum reported benzene concentration n/a <br /> Wells with TPPH 8260B 0 <br /> Wells with MTBE 5 Maximum 1,500 pg/1 (MW-4) <br /> Notes: <br /> **Groundwater gradient 0 001 ft/ft east {shallow), 0 001 ft/ft east (deep) "Previous groundwater <br /> gradient 0 002 ft/ft east (shallow), 0 001 ft/ft east (deep) <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 />