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BLUE RIBBON COAL COMPANY <br /> PIEZOMETER P-3 <br /> 0 <br /> -10 <br /> w <br /> -20 <br /> a <br /> 3 <br /> O <br /> r <br /> -30 <br /> w <br /> 0 n <br /> 1 f ' <br /> -40 <br /> -50 <br /> 6/85 12/85 6/86 12/85 6/87 12/87 5/88 12/88 6/89 12/89 <br /> DATE <br />