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Chromium, Hexavalent <br /> 1 <br /> 0.9 <br /> 0.8 <br /> 0.7 —.-- MW-1 <br /> 0.6 �— MW-2 <br /> —'— MW-3 <br /> 0.5 <br /> 0— MW-4 <br /> 0.4 <br /> —* MW-5 <br /> 0.3 SB-1 <br /> 0.2 <br /> 0.1 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />