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Figure 6 - TREND ANALYSIS - MW-81) <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 Upgraded system re- <br /> for vapor abatement. February 17. 2005. started, July 30, 2008. <br /> -10 <br /> 10,000 <br /> d <br /> ♦ ♦ -20 2 <br /> a <br /> ® W <br /> 0 1,000 ♦ ® ♦ _ ® ® -30 <br /> ♦ ■ ® E <br /> ami M ♦ -40 d <br /> O <br /> 0 100 <br /> ♦ O O -0 -5o m <br /> v > <br /> c v <br /> v <br /> N W <br /> C <br /> op 10 -60 a) <br /> System shut down for upgrades, E <br /> December 6, 2007. <br /> -70 7 <br /> O <br /> 1 0 <br /> Notes: Non-detect analytical results shown at their detection limit with an open symbol. ❑ ❑ ❑ ❑ -80 <br /> Top of casinq elevation = 11.62 feet- msl; top of screen elevation = -85.38 feet <br /> 0 90 <br /> �O N O y0 Cb <br /> ♦ TPHg 0 Benzene f Groundwater Elevation — -Top of Well Screen I, <br /> 01231-154 AECOM Environment <br />