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11 <br /> Summary of Gauging and Sampling Activities <br /> i July 2004 through September 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 08/04/04 <br /> Sample Points <br /> Groundwater wells 8 onsite, 2 offsite 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 /> LRH 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 35.77 feet Maximum 38.56 feet <br /> Average groundwater elevation (relative to available local datum) -23.91 feet <br /> • Average change In groundwater elevation since previous event -2.97 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event *see add'I info <br /> Previous event ** see add'I info (05/14/04) <br /> Selected Laboratog 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 2 Maximum 5,000 p9/1 (MW-4) <br /> Wells with MTBE 5 Maximum. 8,400 pg/l (MW-4) <br /> Notes: <br /> *Groundwater gradients and flow directions are 0 002 ft/ft, east(Shallow Wells) 0 015 ft/ft, east <br /> (Deep Wells) ""Previous groundwater gradients and flow directions were 0 003 ft/ft, northeast <br /> (Shallow Wells), 0 002 ft/ft east(Deep Wells) <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 />