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M M M M M M Wil. I� lilt 1111! <br /> TREND ANALYSIS - MW-4 <br /> TPHg/Benzene Concentrations 8r Groundwater Elevations vs. Time <br /> (Since January 1, 2005) <br /> 5606 Pacific Avenue, Stockton, California <br /> Chevron Site #306620 (Former Unocal #5098) <br /> 100,000 0 <br /> Remediation system start-up with SVE using carbon System shut down for <br /> for vapor abatement, February 17, 2005. frst rebound pulse. <br /> AS shut down forthird -5 <br /> 10,000 System re-started, <br /> rebound pulse. <br /> July 30, 2008. System shut down for <br /> second rebound pulse. -10 j <br /> System shut down for upgrades, m <br /> December 6, 2007. i m <br /> M <br /> 1,000 -15 c <br /> 0 <br /> Z3 E <br /> aci -20 w <br /> U <br /> 0 100 c <br /> U 0 <br /> -25 > <br /> N <br /> � W <br /> d � <br /> a, 10 -30 <br /> = I � <br /> F 3 <br /> 35 t09 <br /> 1 <br /> I El E3 El <br /> -40 <br /> Notes:Non-detect analytical results shown at their detection limit with an open symbol. <br /> 0 Top of rasing elevation=11.50 feet-msl. 1 -45 <br /> Oh 00 O^ 00 <br /> c c c c c c c <br /> �—TPHg f Benzene Groundwater Elevation Top of Well Screen <br /> 60146576 3 of 7 AECOM <br />