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TREND ANALYSIS - MW-6 <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 /> 10,000 0 <br /> Remediation system start-up with SVE using carbon System shut down for <br /> for vapor abatement, February 17, 2005. first rebound pulse. <br /> AS shut down forthird -55 <br /> rebound pulse. <br /> System shut down for upgrades, <br /> 1,000 December 6, 2007. System shut down for <br /> second rebound pulse. -10 j <br /> ' R d <br /> IM rt7 <br /> N <br /> c -15 m <br /> w a> <br /> 100 E <br /> e <br /> -20 <br /> C c <br /> v q <br /> c -25 > <br /> C 10 111 <br /> m System re-started, d <br /> July 30, 2008. -30 3 <br /> a : <br /> F c <br /> I <br /> 1 -35 t7 <br /> El <br /> -40 <br /> Notes:Non-detect analytical results shown at their detection limit with an open symbol. <br /> Top of casing elevation- 11.05 feet-msl. <br /> 0 -45 <br /> o` o`O Q� 00 Q) �o <br /> 4- <br /> c c c c c c <br /> — --TPHg —E—Benzene —0--Groundwater Elevation Top of Well Screen <br /> 60146576 4 of 7 AECOM <br />