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RW4: Groundwater Elevation and Hydrocarbon Concentration Trends <br /> FORMER EXXON RS#7-3942,4444 North Pershing Avenue, Stockton, California <br /> —0—Benzene MTBE TPH-g +GROUNDWATER ELEVATION —A SCREENED INTERVAL -6 FILTER PACK INTERVAL <br /> 180,000 50 <br /> 160,000 00 <br /> 140,000 -50 <br /> -100 <br /> 120,000 <br /> 0 100,000 <br /> o .. <br /> -- -200 a <br /> 80,000 <br /> U <br /> .250 <br /> 60,000 <br /> -300 <br /> x <br /> 40,000 <br /> -350 <br /> 20,000 -40 0 <br /> x <br /> 0 -45 0 <br /> 03/29/86 12/23/88 09/19/91 06/15/94 Date 03/11/97 12/06/99 09/01/02 05/28/05 <br />