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Field pH <br />Colowyo Coal Company L.P <br />10 <br />9 <br />S 8 <br />U <br />7 <br />.. O A-6 <br />6 <br />08/84 08/86 08/88 08/90 08/92 <br />Date <br />08/94 08/96 08/98 OB/00 <br />