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Summary of Gauging and Sampling Activities <br /> January 2005 through March 2005 <br /> 76 Station 5886 <br /> 2701 West March Lane <br /> Stockton, CA <br /> Project Coordinator Shelby Lathrop Water Sampling Contractor TRC <br /> Telephone 916-558-7609 Compiled by Christina Carrillo <br /> Date(s) of Gauging/Sampling Event 02/23/05 <br /> Sample Points <br /> Groundwater wells 11 onsite, 9 offsite Wells gauged 20 Wells sampled 20 <br /> Purging method Bailer/diaphragm 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 /> H dro Bolo is Parameters <br /> Depth to groundwater (below TOC) Minimum 5.22 feet Maximum 8.06 feet <br /> Average groundwater elevation (relative to available local datum) -6.16 feet <br /> Average change in groundwater elevation since previous event 0.30 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.004 ft/ft, southwest <br /> Previous event 0.003 ft/ft, southwest (11/23/04) <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 TPH-G 1 Maximum 220 pg/l (MW-1) <br /> Wells with MTBE 10 Maximum 400 pg/l (MW-1) <br /> Notes: <br /> This report presents the results of groundwater monitonng and sampling activities performed by TRC Please contact the <br /> primary consultant for other specific information on this site <br />