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i i i i i i i ilk r i � i i i i i i i i <br /> TREND ANALYSIS - MW-813 <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 carboM System shut down for <br /> l <br /> d bpulse. <br /> t rebound for vapor abatement, February 17, 2005. fii <br /> System shut down for -10 <br /> se4trid rebound pulse. <br /> 10,000 <br /> -20 > <br /> J N <br /> M O <br /> S N <br /> 1,000 -30 c <br /> a0i <br /> ca AS shut down for third £ <br /> rebound pulse. -� 40 ami <br /> U <br /> O 100 <br /> U0 <br /> System shut down for upgrades, <br /> December 6, 2007. 50 y <br /> N W <br /> � L <br /> d <br /> rn 10 -60 3 <br /> x <br /> F- Upgraded system re-started, <br /> July 30, 2008. 70 a <br /> 0 <br /> 1 ' - <br /> Notes:Non-detect analytical results shown at their detection limit with an open symbol. {✓'''. _80 <br /> Top of casing elevation=11.62 feet-msl;top of screen elevation=-85.38 feet msl. <br /> 0 -90 <br /> oSb o_' �o <br /> c c c c c c c <br /> TPHg f Benzene f Groundwater Elevation Top of Well Screen <br /> 60146576 5 of 7 AECOM <br />