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A 10 x 15 x 30 foot building would house the treatment system and control panels for the dewatering pump. The <br />building would be constructed on a 10 x 3 x 0.5 foot concrete pad, as shown on Maps 17 and 18. <br />Sediment control for the site would consist of seeding and (if necessary) mulching the topsoil stockpiles and cut <br />and fill slopes, and use of an adjacent established vegetative filter. The SAE demonstration for this area is <br />presented in Exhibit 8C, EMD Dewatering Treatment Facility. <br />TORT Mine Dewatering Well No. 2 (MR08-228, MR08-230, MR16-299) <br />In order to both supplement the existing mine dewatering/mine water supply capacity of the IORT Mine <br />Dewatering Well No. 1, and to provide back-up pumping capabilities for the EMD, TC will complete a second <br />mine dewatering well and install associated ancillary equipment and facilities at the current IORT Mine Dewatering <br />Well location. Completion of the new mine dewatering well, l ORT Mine Dewatering Well No. 2, will involve: <br />• Modification of the existing ASC drainage controls at the TORT location, stripping and stockpiling of <br />approximately 240 cy of soil material to accommodate expansion of the existing pad area <br />• Extension of the existing pad area through grading and controlled placement and compaction of <br />approximately 350 cy of select fill materials <br />• Drilling and casing of a 12 -inch diameter borehole approximately 1,360 feet to intersect the sealed and <br />flooded EMD mine workings, and installation of a protected well -head and access manhole <br />• Construction of a 1,000 foot 12 -inch HDPE pipeline to connect to the existing main IORT/FCM-2 Transfer <br />Pipeline, and installation of appropriate control valves to allow routing of the mine discharge water to <br />either the Barricade Chamber/FCM-2 location or to the 6MN Mine Water Storage Reservoir <br />• Extension of a new overhead powerline from Substation 11 to the IORT facilities using the existing poles <br />and 5 new poles, and installation of a new transformer on a small concrete pad at the l ORT facilities <br />• Construction/installation of associated ancillary control and monitoring equipment <br />The incremental surface disturbance associated with expansion of the IORT pad area will be less than 0.20 acres. <br />All other activities will occur within existing disturbance areas. The location and configuration of the associated <br />facilities modifications are shown on the Surface Facilities and Freshwater Systems Map, Map 24, and Drawing <br />EX49P-F 1. <br />Modification of the existing ASC drainage controls will involve realignment of existing ditches and berms to <br />accommodate the minor pad expansion. Recent inspections have indicated some minor siltation and erosion that <br />has affected the effectiveness of existing drainage control structures, so TCC will take advantage of the opportunity <br />to have equipment on-site to complete needed drainage structure maintenance. A conventional down -hole hammer <br />drill -rig will be used to complete and case the No. 2 Well. It is anticipated that air or water will be used as the <br />primary circulation medium, with use of drilling mud only if required to maintain the integrity of the drillhole and <br />adequately flush drill cuttings. Cuttings and any drilling fluids will be retained in a portable cuttings pit. The No. 2 <br />Well will be cased with welded steel casing, which will extend to within 10 feet of the abandoned and flooded <br />EMD mine workings. The casing will be grouted in-place along its entire length, and a wellhead will be installed at <br />the surface from which the pump will hang. A large -diameter CMP culvert will be cemented in-place around the <br />well -head and fitted with a lockable cover. A multi -stage submersible pump will be installed in the well casing and <br />connected to a power controller in the existing well house. The new powerline from Substation 11 will replace the <br />existing powerline, bringing 12,470V power to the TORT Dewatering Installation Substation, where two <br />transformers will convert the incoming power to 2,400V and feed power to the l ORT Dewatering Wells 1 and 2. <br />The connecting pipeline tying to the main IORT/FCM-2 Transfer Pipeline will be trenched and buried <br />approximately 6 feet deep. The connecting pipeline will run from the new TORT Dewatering Well No. 2 to the <br />main lORT/FCM-2 Transfer Pipeline, and then parallel the pipeline for approximately 1,000 feet to the junction <br />with the l ORT/6MN Transfer Pipeline. Flow in this pipeline section will be from the l ORt Dewatering installation <br />to the junction, and then back to the Barricade Chamber/FCM-s location. At this junction, a pre -fabricated CMP or <br />concrete culvert will be installed as a manhole to provide access for pipeline control valves and inspection. A <br />second discharge line will be extended approximately 3,900 feet from control valve manhole, to the south, <br />extending under the 6MN Access Road, and discharging through the existing railroad culvert to Foidel Creek. The <br />TORT Discharge Pipeline will be welded 12 -inch HDPE pipe, buried approximately 5 feet deep, discharging <br />MR16-299 2.05-50.7 06/16/16 <br />