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During construction of the road, approximately 6,815 CY of topsoil was windrowed to the side of the road. This <br />volume is based on constructing a road 4,600 feet long, 20 feet wide and salvaging topsoil to a depth of 24 inches. <br />The topsoil was stockpiled adjacent to or windrowed to the side of the road. The stockpiled topsoil was seeded <br />with the pastureland seed mixture applied at the appropriate rate. The finished width of the road is approximately <br />12 feet and it is covered with approximately 9 to 12 inches of 6 -inch pit run and 3 to 4 inches of 1 V2 -inch road base <br />or crushed rock. Based on use and regulatory definitions, the initial 700 feet of the road is an access road, and the <br />remaining 3,900 feet of road is a light-duty road. Culverts were installed in the small ephemeral drainages along <br />the road, where needed. The design calculations for these culverts, numbered EMD -1 through EMD -4, are <br />presented in Exhibit 8A, Culvert Sizing - EMD Dewatering Facility Access Road. <br />While permitted for installation of a water treatment facility (see the following text), the only facilities currently <br />existing (2008) are the IORT Dewatering Well installation, powerline, discharge line, and associated light -use road. <br />Reclamation will involve culvert removal and ripping, grading, soil replacement, and revegetation of the borehole <br />pad disturbance and road. <br />TC plans to install an additional 10 RT pipeline to assist in the dewatering of the mine. The pipeline would tie in <br />above the pipeline junction for the existing TORT pipeline with the 6MN pipelines and run parallel to the existing <br />1ORT pipeline to the Barricade Chamber and then tie back into the existing pipeline network as shown in the <br />Surface Facilities Map 24 (sheet 2/4) and drawing EX49P-F2. <br />As constructed, the dewatering borehole installation consists of the drill -pad a 14 -inch cased borehole, pump and <br />control building, and transformer. The original drill pad was approximately 100 x 200 feet, within which two 10 x <br />10 x 50 foot mud pits were excavated. A 17.5 -inch nominal diameter borehole was drilled into the sump area, <br />approximately 1,350 feet of 14 -inch metal casing was installed in the borehole, and the annular space grouted. On <br />completion of drilling, the mud pits were backfilled with the excavated material. A submersible pump capable of <br />pumping 600 gpm was installed in the casing. To complete the well installation, an 8 -foot length of 8 -foot diameter <br />corrugated metal pipe with lid was installed over the cased borehole. The material excavated for the 8 -foot <br />diameter cap was spread over the pad. The control building is approximately 10 x 10 x 10 feet, and sets on a <br />concrete pad 10 x 10 x 0.5 foot thick. A transformer was installed at the site to provide the required power for the <br />pump. The transformer area is fenced with a 7 -foot high security chain-link fence around its perimeter. A <br />powerline, approximately 1.5 miles in length, was constructed to tie this location into TC's power system. <br />A 6 -inch riser pipe from the pump exits the 14 -inch casing, and a 90 -degree elbow and associated valving are <br />attached for directing the discharge to the main IORT/FCM-2 Transfer Pipeline or (future) into the 8 -inch HPDE <br />line going to the settling ponds. HDPE pipe is extremely flexible. With a cold bend radius 160 inches, the pipe can <br />be offset 80 inches vertically over a length of 160 inches. This greatly exceeds any potential offset due to surface <br />subsidence. Any future piping to the ponds (approximately 4,800 feet) will be buried to minimize freezing <br />problems. <br />Water from the sump currently discharges to the main IORT/FCM-2 Transfer Pipeline, with the potential to tie-in <br />an 8 -inch HPDE line to treatment ponds at some future time. <br />Potential Future Treatment Installation - Each of the two planned treatment ponds would be approximately 170 x 85 <br />x 8 feet, within an area of approximately 300 x 250 feet. The design for the treatment ponds is presented in Exhibit <br />8C(1), EMD Treatment Pond Design. Approximately 5,550 cy of topsoil would be salvaged and stockpiled <br />adjacent to this pond area. As shown in Figure 1, Exhibit 8C(1), the existing light -use road would be extended to <br />the treatment ponds, forming a loop. Approximately 740 cy of topsoil would be salvaged from the short segment of <br />road connecting the treatment ponds, windrowed to the side of the road, and seeded with the topsoil stockpile <br />stabilization seed mixture. <br />Prior to discharging to the ponds, the discharge water would be treated using similar methods to those used at the <br />Fish Creek Dewatering site to aid in settling of suspended and dissolved materials. A piping manifold or fittings <br />and valves would allow selective discharge to the ponds to maximize their use and efficiency. An interior line <br />between the two ponds would allow for flow between the ponds. A 15 -foot wide road would encircle the ponds to <br />provide for maintenance and repairs. An 8 -inch discharge line buried approximately 4 feet deep would carry the <br />discharge to Foidel Creek. A flow measuring device would be used to obtain the appropriate flow measurements. <br />MR16-299 2.05-50.6 06/16/16 <br />