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■� r r r r r ti w r w <br /> s �- <br /> SP-1 Benzene Concentrations <br /> 3500 - <br /> 3250 <br /> 3000 - <br /> 2750 -- <br /> 2500 -- <br /> 2250 -- <br /> 2000 -- <br /> 0 <br /> 00o2750250022502000G <br /> 1750 --*—Concentration Trend <br /> c <br /> y 1500 <br /> c <br /> 0 1250 <br /> Sparging initiated <br /> 1000 4/25/2001 <br /> 750 New Sparge Well SP-A <br /> Installed 3/14/2002 <br /> 500 - <br /> 250 Sparging Disengaged <br /> 1212002 <br /> 0 - <br /> 0) 0 O O O r Y T r N N N N CO <br /> � � Od OOOOOOOOOOO O <br /> r r N N N N N N N N N N N N N N <br /> r N N N m r N O <br /> an r 0 o o <br /> r r <br /> Date <br /> Histonc Benzene Results AS/SP-1 Chart <br />