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S � <br /> Figure 2: Contaminant Concentration and Water Level Trends (ATR-8) o <br /> Arco Service Station No. 2493 <br /> 3425 Tracy Boulevard, Tracy, California <br /> r <br /> ro <br /> 100,000 m <br /> --ff—benzene <br /> m <br /> SIF—GW Elevationp 0 <br /> 10.000 C° <br /> w <br /> m <br /> 35.0 C. <br /> 4 <br /> I,apO � <br /> 30.0 ; <br /> 0 <br /> 25.0 �. m <br /> 100 p <br /> C ~W <br /> C 2{a.0 w <br /> r <br /> 10 <br /> 15.0 c <br /> Z <br /> 0 <br /> ca <br /> 1 ,; <br /> 5.0 <br /> 0 <br /> 0.0 <br /> Aug-91 Jan-93 May-94 Oct-95 Feb-97 Jun-98 Nov-99 Mar-01 Aug-02 Dec-03 <br /> Date <br /> Note: Gonlarninard concentratfans reported as non-detect(ND)are shown as zero on this <br /> graph. <br /> o <br /> 0 <br />