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Elevation of SWL <br />Colowyo Coal Company L.P <br />6920 <br />6910 <br />f 6900 <br />t <br />M <br />S <br />L <br />O A-6 <br />08/86 08/BB 08/90 OB/92 08/94 08/96 08/98 OB/00 <br />6880 <br />08/84 <br />6890 <br />Date <br />