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The 2010 sediment removal program will largely follow the same procedures that were used during the 2008 <br />effort (TR-15). <br />The primary objectives of the Climax Robinson Lake Sediments Removal Project are to: <br />A. Reclaim water storage capacity lost in the reservoir due to precipitate and sediment accumulation. <br />B. Excavate and handle/place these sediments in a manner that meets the requirements of the <br />existing Climax Mine Reclamation Permit; and <br />C. Recover clean topsoil and subsoil resources encountered during sediment removal for reclamation <br />efforts in other areas. <br />2.1 Proposed Scope of Work <br />The Robinson Lake Sediments Removal work will commence with the mobilization of equipment and <br />personnel on or about the first week in July 2010 upon acceptance of this TR by DRMS. In general, the scope <br />of work to be performed as part of the project includes: 1) Divert and dewater Robinson Lake; 2) Remove <br />sediments using a mechanical-excavation technique (as appropriate) from the area illustrated on Figure l; and <br />3) Load excavated material into articulating trucks and transport the material via the haul road for placement <br />in a sediments fill area (Figure 1) located in the Tenmile tailings storage facility (TSF). <br />Specific Robinson Lake Sediments Removal tasks include the following activities: <br />3.0 Sediment Removal <br />The plan is to excavate and haul the sediment material to an area located on the Tenmile TSF, (Figure 1). <br />3.1 Diversion, Dewatering and Un-watering of Sediment Material <br />A. The work will require diversion, dewatering and un-watering of the excavation area for the <br />completion of the work. Temporary diversions, settling ponds, and construction pumping systems <br />will be installed as needed by the contractor and pumped to Warren's Pump Station (WPS). This <br />water will then be pumped through the WPS system to treatment at the Sludge Densification Plant <br />(SDP). <br />Warren's Pump Station removes water from the basin to enable excavation operations. As such, a <br />temporary dike will be constructed in the upper end of the reservoir to allow for sediments to settle <br />out and decant clean water to be directed to the Warren's Pump system. Figure 2 shows the location, <br />construction performance specifications, and stage-storage anticipated for the temporary dike. <br />3.2 Access Development at Excavation and Deposition Locations <br />A. Access at the excavation and deposition sites will be developed to ensure safe access by equipment. <br />3.3 Deposition Site <br />A. The precipitates and sediments will be deposited in the on the south-east corner of the Tenmile TSF, <br />bounded by the East Side Channel, the 4 Dam tailing and the Tenmile water pool (Figure 1). <br />B. A deposition site for the sediment removed in 2008 was constructed at the base of 2 Dam. The east <br />berm of this location prevents precipitates and sediments from running into the East Side Channel <br />where it could affect water treatment operations. A portion of the deposition area is anticipated to run <br />proximate to the water pool between the 2008 precipitates and sediments from Robinson Lake and the <br />4 Dam (Oxide Pond) tailing delta.