2008-09-16_PERMIT FILE - C1982056A (3)

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New Coal Washplant (Washplant II - TR07-59) In 2007, TCC completed engineering/economic evaluations and determined that construction of a new washplant was justified to increase the amount of low-quality coal that could be converted to a saleable product, address fluctuations in ash content as mining extended into reserve boundary areas, and potentially increase mineable reserves and extend mine life. The new washplant, Washplant II, has been designed to supplement the existing coal processing capacity of the existing washplant (Washplant I), with Washplant I being used to process low- quality coal, and Washplant II being used to wash and enhance the quality of the primary coal process stream from the ROM Coal Stockpile. The design for Washplant II focused on providing approximately 1,300 tph feed capacity, minimizing conveyor lengths and open coal stockpiling requirements, limiting potential air emission sources, providing for direct discharge of clean coal to the existing Overland Conveyor, and establishing a configuration that could be expanded in the future to add additional wash circuits, if needed. Washplant II is located to the southwest of the existing Washplant, between Washplant I and Sedimentation Pond D, adjacent to the Overland Conveyor, as shown on the Freshwater Systems and Surface Facilities Map, Map 24 (Sheet 1/3). In order to integrate the new Washplant II into the existing coal-handling system, construction/modification of both new and existing equipment and facilities was required as follows: • Dismantle old Stacker Tube and associated conveyor structures • Modify the run-of--mine and low-quality coal handling systems to reduce the quantity of run-of--mine product diverted as low-quality coal, and to eliminate low-quality coal crushing and simplify flow (eliminate intermediate transfers) to Washplant I • Remove the primary and secondary screening equipment, crusher, and coal sampling system from the Crushing and Sampling buildings in the Belt-Out-Back (BOB) area • Modify chute-work in the Crusher and Sampling Buildings in the BOB area to allow direct pass-through of the coal product stream • Modify existing drainage structures, including the Sedimentation Pond D spillway(s) to accommodate the revised grading plans and drainage configuration • Complete site backfill, compaction, and grading activities to establish required facilities pad and yard areas • Complete required building and conveyor foundation work • Replace the initial segment of the existing Overland Conveyor with an inclined Crushing/Screening Feed Conveyor, and shift the Overland Conveyor tailpiece to the west • Construct a new coal Crushing/Screening Building and install related equipment and control systems • Erect atwo-flight Washplant Feed Conveyor and Transfer Tower to transfer the intermediate coal product from the bottom of the Crushing/Screening Building to the top of the new Washplant Building • Construct Washplant II Building and install 1,300 tph washing, screening, and heavy-media and dewatering cyclone circuits • Construct a new Thickener, Thickener Underflow Line connecting to the drop-borehole into the mine, and excavate a new Thickener Overflow Sump • Construct the MCC/Office Building for the Washplant II complex • Erect a new Refuse Conveyor and Refuse Loading Bin • Construct a new Sampling Station on the overland conveyor • Extend a 69KV distribution line from the existing 69KV powerline, and establish a new Washplant Substation Although not specifically a component of the Washplant II project, the Stacking Tube and associated conveyor structures on the Truck Loadout pad were dismantled/demolished, and the conveyor components salvaged for reuse. The following modifications to the existing coal-handling system were made in order to integrate the new • Washplant: TR08-65 2.05-32.1 07/08/08