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OLD REFUSE PILE, STATION # P - 1 <br /> Sulfate <br /> 70 <br /> 77 <br /> 60 <br /> 50 <br /> 40 <br /> rn <br /> E <br /> 30 <br /> 20 <br /> 10 <br /> 0 <br /> 4/85 4/86 6/87 6/88 6/89 <br /> Sprin /Summer 1985-1989 <br /> Sulfate <br />