2004-05-03_REPORT - M1977004 - Laserfiche WebLink

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• Pitch Reclamation Project April 29, 2004 2003 Annual Reclamation Report Page 3 In 2002, a total of 1,000 lodge pole pines and 200 spruce were planted on the recontoured area. In 2003, reclamation in the RTP area consisted of further steps to control sedimentation and to stabilize the slope adjacent to and down gradient from the RTP. Activities included the construction of small dikes in the drainage to allow the creation of small catch basins followed by the placement of timber slash in the drainage to retard flow velocity and to trap sediment. Stabilization work in 2003 included planting of 500 additional lodge pole pine and 200 douglas fir seedlings on the slope opposite the RTP building site; see Figure 2. All work was conducted in accordance with conditions in the Radioactive Materials License and the Pitch Reclamation Project Procedures Manual. 3.2 Tie Camp Creek Disposal Cell In 2001 and 2002, dismantled building material from the 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 the mid-1990's as a clay lined repository for the coarse materials dredged from the Sediment Pond. The cell, as shown on Figures 2 & 3, had been left open with sufficient capacity for the RTP demolition material. In 2003, activities included crushing, compaction and grading of the demolition material and contaminated soil. In 2004, the deposited material will be covered with atwelve-inch clay cap, placement of overburden cover and revegetated. All work conducted in 2003 was in accordance with applicable conditions in the Radioactive Materials License and the Pitch Reclamation Project Procedures Manual. 4.0 MONITORING AND ANNUAL REPORTING 4.1 Slope Movement Vector Analysis Survey monuments have been installed on the east and south walls of the North Pit to monitor surficial slope movement. For clarity, the area east of the pit lake and south of Northing 113,500 is referred to as the south wall of the North Pit; and the area east of the pit- lake and north of Northing 113,500 is referred to as the east wall of the North Pit. This differentiation is for ease in discussing slope movement and does not imply that there is a kinematic distinguishing feature at this location. The original group of monitoring points was installed in 1994; additional monitoring points were established in 1996, 1997, 1998, and 1999. No new monuments have been installed since 1999. Monument locations are provided on the Slope Velocity Vectors Map presented in Appendix A. Surveys are usually conducted as close to one year apart as possible, allowing the magnitude of displacement to be reported as a velocity in terms of ft/year. Surveys of all accessible monuments were conducted on September 1, 2003 with the previous survey performed on September 20, 2002. Although the survey intervals can be greater or less than one year, slope movement is not typically observed in the late summer months, so the data should be representative of annual displacement. The surveys are actually conducted over several consecutive days with the median date used to represent the data set. Of the 68 points surveyed in 2003, only 13 had magnitudes that were greater than survey error, as shown on Table 1. By comparison, 37 points had magnitudes greater than survey error reported in 2001. Velocity vectors were calculated for the 13 points and are depicted with green circular symbols and velocity vectors on the Slope Velocity Vector Map in Appendix A. Points with a displacement less than the survey error are shown in gray on the map.