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pH <br /> 8.65 <br /> 8.60 <br /> 8.55 <br /> 8.50 <br /> y —'— SW-t <br /> c 8.45 <br /> a _—o-- SW-2 <br /> 8.40 <br /> 8.35 <br /> 8.30 <br /> 8.25 <br /> Jan-92 Apr-92 Jul-92 Oct-92 Jan-93 Apr-93 Jul-93 Oct-93 Jan-94 <br />