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Summary of Gauging and Sampling Activities <br /> October 2004 through December 2004 <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 Christina Carrillo <br /> Date(s) of Gauging/Sampling Event 11/23/04 <br /> Sample Points <br /> Groundwater wells- 8 onsite, 2 offsite Wells gagged 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 35.87 feet Maximum 38.54 feet <br /> Average groundwater elevation (relative to available local datum) -24.04 feet <br /> . Average change in groundwater elevation since previous event -0.13 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event **see notes below <br /> Previous event *see notes below (08/04/04) <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 4 Maximum 8,800 pg/I (MW-4) <br /> Wells with MTBE 5 Maximum 10,000 p9/1 (MW-4) <br /> Notes: <br /> `*Groundwater gradient 0 002 Rift east (shallow), 0 002 ft/ft east(deep) *Previous groundwater <br /> gradient 0 002 ft/ft east (shallow), 0 015 Rift 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 />