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OLD REFUSE PILE, STATION # P - 2 <br /> Sulfate <br /> 45 <br /> 40 <br /> 35 <br /> 30 <br /> _ 25 <br /> E <br /> 20 <br /> 15 <br /> 10 / <br /> 5 <br /> 0 <br /> 7/85 4/86 6/87 6/88 6/89 <br /> Spring/Summer 1985-1989 <br /> Sulfate <br />