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OLD REFUSE PILE, STATION # P - 2 <br /> S U LFATE <br /> 40 <br /> 35 <br /> 30 <br /> 25 <br /> 20 <br /> E <br /> 15 <br /> 10 <br /> 5 <br /> 0 Lzzzzzd <br /> 10/85 10/86 11/87 10/88 10/89 <br /> Fall 1985-1989 <br /> Sulfate <br />