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Tetrachloroethene <br /> 4.5 <br /> 4 <br /> 3.5 <br /> ® MW-1 <br /> 3 <br /> --o MW-2 <br /> 2.5 —.— MW-3 <br /> 2 —o-- MW-4 <br /> —*— MW-5 <br /> 1.5 <br /> �— SB-1 <br /> 1 <br /> 0.5 _ <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />