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application was called complete on September 10, 2010. TR -88 was approved on November 9, <br />2010. TR -88 extended the West Taylor temporary out of pit spoil pile. <br />TR -89: Technical Revision No. 89 was received on February 15, 2011, called complete on <br />February 24, 2011, and approved on March 18, 2011. TR -89 approved permanent stock tanks. <br />TR -90: Technical Revision No. 90 was received on April 18, 2011, called complete on April 26, <br />2011, and approved on May 17, 2011. TR -90 added small area exemptions for a topsoil pile and <br />Tri -State transmission line in the East Pit reclamation. <br />TR -91: Technical Revision No. 91 was received on July 6, 2011, called complete on July 14, <br />2011, and approved on August 11, 2011. TR -91 approved termination of monitoring the <br />piezometers on Streeter Fill. <br />TR -92: Technical Revision No. 92 was received on August 12, 2011. TR -92 was deemed <br />complete on August 19, 2011, and approved on October 31, 2011. TR -92 approved a slow down <br />to the mining rate in the West Pit and revised the timing of spoil grading resulting from the <br />slowdown. <br />TR -93: Technical Revision No. 93 was received on September 9, 2011. TR -93 was considered <br />complete on September 18, 2011. TR -93 was approved on October 31, 2011. TR -93 approved <br />changes to the logical mining unit (LMU) and relinquishment of portions of two federal leases. <br />TR -94: Technical Revision No. 94 was received on February 21, 2012. TR -94 was considered <br />complete on March 1, 2012. TR -94 was approved on April 3, 2012. TR -94 approved changes to <br />the post- mining topography in the East Pit to ensure proper tie -in of reclamation boundaries. <br />TR -95: Technical Revision No. 95 was received on April 24, 2012. TR -95 was considered <br />complete on May 4, 2012. TR -95 proposes changes to the previously approved hydrologic curve <br />number associated with reclaimed lands. TR -95 is still under review by the Division. <br />TR -96: Technical Revision No. 96 was received on July 30, 2012, and found complete on July <br />31, 2012. TR -94 was approved on September 27, 2012. TR -96 revised the elevation of the West <br />Pit Fill Ditch. <br />TR -97: Technical Revision No. 97 was received on December 12, 2012. TR -97 was found <br />complete on December 14, 2012. TR -97 proposes changes to ditch channel linings and updated <br />SEDCAD modeling. The Division approved TR -97 on April 8, 2013. <br />TR -98: Technical Revision No. 98 was received on December 17, 2012. TR -98 was found <br />complete on December 27, 2012. TR -98 proposed changes to the West Taylor Fill temporary <br />out of pit spoil pile design. TR -98 was approved on February 22, 2013. <br />Colowyo Coal Mine C1981 -019 PR -03 16 April 10, 2013 <br />