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OLD REFUSE PILE , STATION # P - `1 <br /> Sulfate <br /> 80 <br /> 70 <br /> 60 <br /> 50 <br /> 40 <br /> E <br /> 30 <br /> 20 <br /> 10 <br /> 0 <br /> 10/85 10/86 11/87 10/88 10/89 <br /> Fall 1985-1989 <br /> Sulfate <br />