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pH (Lab) <br />Colowyo Coal Company L.P <br />14.0 <br />10.5 <br />S 7.0 <br />U <br />3.5 <br />0.0 <br />09/89 <br />09/91 09/93 <br />O NGSW <br />09/95 09/97 09/99 <br />Date <br />