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Graph 4 <br /> MTBE Concentrations vs Time <br /> Former BP Oil 11192 <br /> 200000 50 <br /> I <br /> 150000 50 <br /> a <br /> o <br /> —0 5-6 <br /> w <br /> '" - -- <br /> VW-2 <br /> u <br /> C <br /> 0 <br /> V 100000 50 <br /> w <br /> E+ <br /> 5000050 <br /> 050 <br /> Apr-90 Jan-93 Oct-95 Jul-98 Apr-01 Jan-04 <br /> Time <br />