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Colowyo Coal Company <br />2011 Annual Reclamation and Hydrology Report <br />developed during 2011. The West Pit Fill was inspected quarterly for any evidence of <br />surficial slope failure on the face of the fill and none was found. A quarterly review <br />of the survey monuments on the fill noted no significant changes in their positions, <br />suggesting that the fill continues to be stable. <br />Section 16: Under Technical Revision 64 monitoring requirements for Section 16 Fill <br />were relinquished and monitoring was discontinued during the 3rd quarter of 2006. <br />South Taylor Fill: The South Taylor Fill was inspected for significant changes in <br />under drain integrity and any evidence of surficial slope failure on the face of the fill. <br />No significant concerns were found in 2011. In addition, the fill was inspected <br />quarterly to identify the development of any springs or seeps on the face of the fill. <br />No seeps or springs developed during 2011. The South Taylor Fill was inspected <br />quarterly for any evidence of surficial slope failure on the face of the fill and none was <br />found. <br />Page 7 -2 <br />