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In the event that TCC decides to install a water treatment system at this location in the future, water from the sump <br />will discharge to two ponds, each approximately 170 x 85 x 8 feet, within an area of approximately 300 x 250 feet. <br />The design for the treatment ponds is presented in Exhibit 8C(1), EMD Treatment Pond Design. Approximately <br />5,550 cy of topsoil will be salvaged and stockpiled adjacent to this pond area. As shown in Figure 1, Exhibit 8C(1), <br />an access road (loop) will be constructed to the treatment ponds. Approximately 740 cy of soil material will be <br />salvaged from the short segments of road leading to the ponds. The soil will be windrowed to the side of the road <br />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 <br />chemical feed system and control panels for the dewatering pump. The building will be constructed on a 10 x 3' x <br />0.5 foot concrete pad, as shown on Maps 17 and 18. <br />Sediment control for the site will consist of seeding and (if necessary) mulching the topsoil stockpiles and cut and <br />fill slopes, and use of an adjacent established vegetative filter. The SAE demonstration for this area is presented in <br />Exhibit 8C, EMD Dewatering Treatment Facility. <br />• <br />• <br />MR07-224 2.05-78 10/17/07 <br />