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Alkalinity, Bicarbonate <br /> 500 <br /> 450 <br /> 400 <br /> 350 —■— MW-1 <br /> 300 MW-2 <br /> —•— MW-3 <br /> E 250 <br /> ® —� MW-4 <br /> 200 �— MW-5 <br /> 150 S&1 <br /> 100 <br /> 50 <br /> 0 <br /> Jon-88 Jan-89 Jon-90 Jan-91 Jan-92 Jan-93 Jan-94 Jan-95 <br />