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TR -89: This revision was received on 15 February 2011, called Complete on 24 February 2011, <br />and approved on 18 March 2011. TR -89 added eight livestock ponds in the permit area as <br />permanent features. <br />TR -90: This revision was received on 18 April 2011, called Complete on 26 April 2011, and <br />approved on 17 May 2011. TR -90 removed a topsoil pile (and the affiliated access road) from <br />the East Pit Phase III bond release area and added a Tri -State right of way in the East Pit area for <br />a power line. <br />TR -91: This revision was received on 6 July 2011, called Complete on 13 July 2011, and <br />approved on 11 August 2011. TR -91 terminated piezometer monitoring on the Streeter Fill. <br />TR -92: This revision was received on 12 August 2011, called Complete on 19 August 2011, and <br />approved on 31 October 2011. TR -92 updated maps (spoil grading, mine plan) to reflect the <br />slowdown in mining. <br />TR -93: This revision was received on 9 September 2011, called Complete on 18 September <br />2011, and approved on 31 October 2011. TR -93 updated the permit to reflect changes in coal <br />leases. <br />TR -94: This revision was received on 21 February 2012, called Complete on 1 March 2012, and <br />approved on 3 April 2012. TR -94 revised the post- mining surface in the East Pit to ensure <br />proper tie -in of reclamation boundaries. <br />TR -95: This revision was received on 24 April 2012 and called Complete on 4 May 2012. <br />Adequacy letters were sent to Colowyo on 1 June 2012 and 2 July 2012. This revision is still <br />under consideration by the Division. TR -95 proposes to update the hydrologic curve number <br />(used in hydrologic modeling) associated with reclaimed mined lands. <br />TR -96: This revision was received on 30 July 2012, called Complete on 31 July 2012, and <br />approved on 27 September 2012. TR -96 lowered the approved elevation of West Pit Fill Ditch <br />to achieve a proper tie in of topography with the previously constructed reach of this ditch. <br />TR -97: This revision was received on 12 December 2012, and called Complete on 14 December <br />2012. This revision is still under consideration by the Division. When approved, TR -97 will <br />result in changes in channel linings for ditches in the East Pit and West Pit areas and updates of <br />related SEDCAD modeling. <br />TR -98: This revision was received on 17 December 2012, called Complete on 27 December <br />2012, and approved on 22 February 2013. TR -98 revised West Taylor Fill temporary out of pit <br />spoil pile design. <br />Proposed Decision and Findings of Compliance January 2012 <br />Permit Renewal 06 Pa g e 18 <br />