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Summary of Gauging and Sampling Activities <br /> ,January 2005 through March 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 Christina Carrillo <br /> Date(s) of Gauging/Sampling Event 01./26/05 <br /> Sample Points <br /> Groundwater wells 7 onsite, 3 offsite T Wells gauged. 10 Wells sampled 10 <br /> Purging method Bailer/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, 33.31 feet Maximum. 35.8 feet <br /> Average groundwater elevation (relative to available local datum) -21.27 feet <br /> . Average change in groundwater elevation since previous event 2.77 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event *see notes below <br /> Previous event **see notes below (11/23/04) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 0 - Wells above MCL (1 0 pg/l) n/a <br /> Maximum reported benzene concentration n/a <br /> Wells with TPPH 8260B 1 Maximum 52 pg/I (MW-10) <br /> Wells with MTBE 5 Maximum 10,000 pg/I (MW-4) <br /> Notes: <br /> "Groundwater gradient 0 002 ft/ft east (shallow), 0 001 ft/ft east (deep) "*Previous groundwater <br /> gradient 0 002 ftlft east (shallow), 0 002 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 />