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Figure 4 - TREND ANALYSIS - MW-2 <br /> TPHg/Benzene Concentrations & Groundwater Elevations vs. Time <br /> (Since January 1, 2005) <br /> 5400 and 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 <br /> for vapor abatement, February 17, 2005. <br /> 10,000 <br /> ♦ ♦ System shut down for upgrades, ♦ ♦ m <br /> a December 6, 2007. 10 <br /> cc <br /> V � N <br /> c1,000 ® M <br /> ® ® d ® ® 15 <br /> O � v <br /> c 100 -20 c <br /> U r <br /> y m <br /> c > <br /> N -25 W <br /> m 10 <br /> rn Upgraded system re-started, 3 <br /> a July 30, 2008. 30 <br /> F 3 <br /> O <br /> 1 Note: Non-detect analytical results shown at their detection limit with an open symbol. ❑ ❑ -35 <br /> Top of casing elevation = 11.39 feet - msl. <br /> 0 -40 <br /> doh o ho o`O ti ho \oma o <br /> h <br /> ♦-- TPHg ® Benzene 0 Groundwater Elevation -Top of Well Screen <br /> 01231-154 AECOM Environment <br />