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In conjunction with construction of the 6MN Facilities project, a valved connection was established on the existing <br />transfer line, and a separate 7,750 foot transfer pipeline was constructed to the existing 6MN Million-Gallon Tank. <br />• Supplemental control equipment was added to provide for operation of the valves and to allow remote shut-off of <br />the submersible pump for both maintenance, and in the event of a tank high-level alarm. <br />In the event that TCC decides to install a water treatment system at the lORT Dewatering Well location in the <br />future, water from the sump will discharge to two ponds, each approximately 170 x 85 x 8 feet, within an area of <br />approximately 300 x 250 feet. The design for the treatment ponds is presented in Exhibit 8C(1), EMD Treatment <br />Pond Design. Approximately 5,550 cy of topsoil will be salvaged and stockpiled adjacent to this pond area. As <br />shown in Figure 1, Exhibit 8C(1), an access road (loop) will be constructed to the treatment ponds. Approximately <br />740 cy of soil material will be salvaged from the short segments of road leading to the ponds. The soil will be <br />windrowed to the side of the road and seeded with the topsoil stockpile stabilization seed mixture. <br />Prior to discharging to the ponds, the mine water will be treated using the same methods used at the Fish Creek <br />Dewatering Borehole to aid in the settling of suspended and dissolved materials. TCC's experience indicates that <br />use of these methods to pre-treat the mine water in conjunction with settling ponds, is adequate to assure <br />compliance with applicable water quality standards. A piping manifold or fittings and valves will allow selective <br />discharge to the ponds to maximize their use and efficiency. An interior line between the two ponds will allow for <br />flow between the ponds. A 15-foot wide road will encircle the ponds to provide for maintenance and repairs. An <br />8-inch discharge line buried approximately 4 feet deep will carry the discharge to Foidel Creek. A flow measuring <br />device will be used to obtain the appropriate flow measurements. A 10 x 15 x 30 foot building will house the mine <br />water treatment system and control panels for the dewatering pump. The building will be constructed on a 10 x 3' <br />x 0.5 foot concrete pad, as shown on Maps 17 and 18. <br />Sediment control for the site consists of ASC's including gravel surfacing of the pad area and road, seeding and (if <br />necessary) mulching the topsoil stockpiles and cut and fill slopes, the use of designed collection/diversion ditches <br />• and berms, and an adjacent well-established vegetative filter between this facility and Fish Creek. The SAE <br />demonstration for this area is presented in Exhibit 8C, EMD Dewatering Treatment Facility. <br />• <br />MR08-228 2.05-78 03/06/08 <br />