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A <br /> Mercury, Dissolved <br /> 0.003 <br /> 0.0025 <br /> ■— MW-1 <br /> 0.002 <br /> MW-2 <br /> c —®— MW-3 <br /> E 0.0015 n <br /> MW-4 <br /> —� MW-5 <br /> 0.001 <br /> �— SB-1 <br /> 0.0005 <br /> 0 <br /> Jan-88 Jan-89 Jan-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />