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Summary of Gauging and Sampling Activities <br /> January 2006 through March 2006 <br /> Circle K Store 08671 <br /> 8606 Thornton Road <br /> Stockton, CA <br /> Project Coordinator, Edward Ralston Water Sampling Contractor TRC <br /> Telephone 916-5S8-7633 Compiled by- Daniel Lee <br /> Date(s) of Gauging/Sampling Event, 01/18/06 <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/LPH n/a <br /> Hydrogeologic Parameters _ <br /> Depth to groundwater (below TOC) Minimum. 32 feet Maximum 34.53 feet <br /> Average groundwater elevation (relative to available local datum), -19.97 feet <br /> Average change in groundwater elevation since previous event- 3.07 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event *see notes <br /> Previous event **see notes (10/14/05) <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 82608 1 Maximum- 2,100 pg/I (MW-1) <br /> Wells with MTBE 5 Maximum. 2,900 pg/1 (MW-4) <br /> Notes: <br /> 'Groundwater gradient 0 001 ft/ft northeast (shallow), 0 001 ftlft east(deep) "*Previous groundwater <br /> gradient 0 003 ft/ft northeast(shallow), 0 01 ftlft north (deep) <br /> I <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 /> I <br />