2015-04-03_INSPECTION - C1981019

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March 30, 2015 C- 1981 - 019 / Colowyo Coal Mine RDZ Other observations regarding the ponds: • No problems were observed with any of the embankments of the ponds. • Other than the leaks at Work Area and Prospect, no problems were observed with spillways of the ponds. • The Stoker Siding flume needs to be replaced by October 2015. • Rail Loop needs to be cleaned. • Some algae were observed in the West Pit Pond and in the spring water above East Taylor Pond. This needs to be monitored and removed if it gets worse or TSS values become a problem. The spring and seep above the East Taylor Pond were both contributing significant water to the pond; this is expected in spring months. Algae and a white mineral deposit were seen in the area below the spring. Sumps along the road to the Taylor ponds were inspected. Sumps 2, 4, and 5 were holding water. The berm maintenance at Sumps 2 and 5 has been performed, and no sumps appear to need cleaning at this time except Sump 1 (it has been partially cleaned). Ditchouts from the road up the valley from the sumps were inspected. There were no signs of sediment loading from these into the buffer zone. Ditches and stock tanks in the East Pit reclamation area were inspected, and the following observations were made: • Prospect Ditch, above PD stock tank, has been cut down and may require maintenance, namely a re- working of riprap. DRMS and Colowyo will work on this as necessary. • Other reaches of ditches, including the lower end of Prospect Ditch where repairs were made in 2012, are in good shape. • Many of the stock tanks held water, but most were well below the spillway. PD 1 was still being dewatered with suction hoses. No problems were seen with these stock tanks. The lined portion of the Section 28 Ditch was inspected. It is generally stable. The frayed portion of the liner (at the lower end) was pulled back in place by Kurt Blunt during the inspection. The damaged liner does not appear to be problematic at this time. The West Pit Coal Road Ditch and the West Pit Fill Ditch were inspected and no problems were identified. The erosion mats in the Coal Road Ditch are holding up well. Many contour ditches were inspected in the Colowyo Mine reclamation areas. Only one location was identified as requiring repairs: a ditch near the confluence of East Taylor Ditch and Taylor Tributary Ditch. Three culverts were inspected (K, L, and M along the entrance road), and no maintenance needs were identified. They have recently been cleaned. ROADS — Rule 4.03 Construction 4.03.1(3)/4.03.2(3) Drainage 4.03.1(4)/4.03.2(4) Surfacing and Maintenance4.03.1(5) and (6)/4.03.2(5) and (6) Reclamation 4.03.1(7)/4.03.2(7): No problems were seen with haul roads, the pit road, or the road to East Taylor Pond. Number of Partial Inspection this Fiscal Year: 6 Number of Complete Inspections this Fiscal Year: 3 Page 4 of 14