2007-04-20_REPORT - M1977004 - Laserfiche WebLink

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Pitch Reclamation Project Colorado Mined Land Reclamation Board 2006 Annual Reclamation Report 3.1 Constructed Wetlands Area and Adjacent Slope Reclamation activities in 2006 consisted of improvements to the constructed wetlands area (area of the old RTP building and the adjacent drainage). The former site of the RTP was backfilled and recontoured in 2001, with grading and initial revegetation in 2002. These activities included the steep embankment behind the former RTP site, where the area was graded to reduce the slope and prevent sloughing. Reclamation in the area has consisted of recontouring to facilitate improved sedimentation control and to stabilize the slope adjacent to and down gradient from the site. Activities have included construction of small dikes in the drainage to allow the creation of small sedimentation basins followed by the placement of timber slash in the drainage to retard flow velocity and to trap sediment forming a wetlands type condition. Since 2002, stabilization measures have included planting of 1,000 lodge pole pines, and 200 spruce trees on the contoured area and planting of 500 lodge pole pine and 200 douglas fir seedlings on the slope opposite the constructed wetlands area. In 2006, a significant number of fatalities were observed among trees planted during previous seasons on the slope opposite the constructed wetlands area. These dead trees were replaced with approximately 400 new lodge pole seedlings. 2006 work also included placement of several large rocks and rock material across the lower end of the constructed wetlands area to further enhance sediment control and prevent previously placed tree slash from washing to the trash racks during thunderstorm events. An additional 100 lodge pole seedlings were planted on the 10,300 bench to the west of the shop building. 3.2 Tie Camp Creek Disposal CeII In 2001 and 2002, dismantled building material from the former RTP, concrete and contaminated soils removed from the immediate drainage, were removed and placed in a Disposal Cell near the toe of Tie Camp Creek Low-Grade Stockpile. This cell was created in mid-1990 as clay lined repository for materials dredged from the Sediment Control Pond. The cell, as shown on Figures 2 & 3, was left open with sufficient capacity for the RTP demolition material. The demolition material and contaminated soil placed in the cell were crushed and compacted. In 2003, the cell was shaped and prepared for the placement of a clay cap. Placement and compaction of a clay cap was completed in 2004. A final layer of topsoil (minimum 24 inches) was added and compacted on top of the clay cap during 2005. In 2006, some re-grading of an area of the topsoil cover material was performed to eliminate a low spot where water was ponding. Scarifying and reseeding the surface of disposal cell area was planned for 2006. However, conditions during the late summer and fall 6