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Colowyo C-1981-019 <br />10 February 2010 <br />Pg 4/4 <br />OSM AOC SPECIAL FOCUS INSPECTION (Cont.): While the elevation measurements in <br />the East Pit appear to be up to 40 feet lower than those approved on Map 19, there <br />is a vertical error of up to 60 feet in the Trimble GeoXT handheld unit. This could <br />account for the apparent decrease in the reclaimed elevation measured in the field. <br />The Division has plans to measure the elevation at several of these points this summer <br />(2010) with a more accurate unit and compare them to the elevations from Map 19. <br />Additionally, the Division will compare the proposed post-mining topography (from <br />Map 19) with the as-built topography for the backfilled areas (Exhibit 5A of the <br />Annual Reclamation Report) in the yearly ARR review. <br />This completes the 10 February 2010 inspection report for the Colowyo Mine.