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TREND ANALYSIS - MW-25D <br /> TPHg/Benzene Concentrations & 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 <br /> System shut down for 0 <br /> Remediation system start-up with SVE using carbo fiirst rebound pulse. <br /> for vapor abatement, February 17, 2005. System shut down for <br /> second rebound pulse. <br /> 10,000 P <br /> -10 <br /> Upgraded system re-started, <br /> _ July 30, 2008. AS shut down for third j <br /> J rebound pulse. CD <br /> CU <br /> r_ 1,000 <br /> 0 20 c <br /> C d <br /> LIr E <br /> V <br /> d <br /> U w <br /> to 100 - 30 00 <br /> I o <br /> m - <br /> c CO <br /> N System shut down for upgrades, <br /> m <br /> December 6, 2007. w <br /> m 10 <br /> _ -40 3 <br /> a a <br /> H <br /> 0 <br /> 0 <br /> L <br /> -50 <br /> C7 <br /> Notes:Non-detect analytical results shown at their detection limit with an open symbol. <br /> Top of casing elevation=11.39 feet-msl. <br /> 0 -60 <br /> O� 00 O^ 00 O ^O .. <br /> —*—TPHg f Benzene f Groundwater Elevation Top of Well Screen <br /> 60146576 7 of 7 <br /> AECOM <br />