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. Y <br /> Summary of Gauging and Sampling Activities <br /> April 2005 through June 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 Daniel Lee <br /> Date(s) of Gauging/Sampling Event* 06/06/05 <br /> Sample Points <br /> Groundwater wells 11 onsite, 9 offsite Wells gauged 20 Wells sampled 11 <br /> Purging method 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 LPN 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 5.61 feet Maximum 8.49 feet <br /> . Average groundwater elevation (relative to available local datum) :6.45 feet <br /> Average change in groundwater elevation since previous event -0.37 feet <br /> Interpreted groundwater gradient and flow direction <br /> Current event 0.005 ft/ft, southwest <br /> Previous event 0.004 ft/ft, southwest (02/23/05) <br /> Selected Laboratory Results <br /> Wells with detected Benzene: 1 Wells above MCL (1 0 pg/1) 0 <br /> Maximum reported benzene concentration 0.53 pg/l (MW-6S) <br /> Wells with TPH-G 1 Maximum 150 pg/l (MW-1) <br /> Wells with MTBE 8 Maximum 240 pg/i (MW-1) <br /> Notes: <br /> MW-5D=Sampled semi-annually, MW-SS=Sampled semi-annually, MW-70=Sampled semi-annually, <br /> MW-7S=Sampled semi-annually, MW-81=Sampled semi-annually, MW-BS=Sampled semi-annually, <br /> MW-9D=Sampled semi-annually, MW-91=Sampled semi-annualiy, MW-9S=Sampled semi-annually, <br /> This report presents the results of groundwater monitoring and samplingactivities performed T <br /> primary consultant for other specific information on this site p ed by RC Please contact the <br />