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was placement of an aerator in the western cell. This aerator may be tamed off after the one in the eastern cell is <br />turned on. <br />Due to the fact that the pH is being elevated, it was decided to have sulfuric acid available in the event a pH <br />• adjustment was needed prior to the effluent discharging from the system. The chemical and equipment for this <br />procedure is house in the chemical storage building located on the west side of the west cell as shown on Map 32. <br />This system will be used only if the effluent approaches the pH discharge limitation of 9.0. <br />In 2006, the sodium hydroxide system was replaced with an electro-coagulation system which achieves the same <br />result through ionization and agglomeration of particulate iron. <br />Eastern Mining Distrito - Dewaterine Borehole <br />The dewatering system will be divided into two components: 1) dewatering borehole and control building, and 2) <br />treatment facility. The dewatering borehole will be constructed above and into the sump developed off of the 10 <br />Right entry. Please refer to Map 23, Mine Plan, for the proposed location of the sump. Alight duty road will be <br />constrncted into the site beginning at the treatment facility and terminating at the borehole. The beginning 1,600 <br />feet of this road will require new construction while the remainder of the road will see the upgrading of an existing <br />ranch road. The location of the access road is shown on Maps 17 and 18. As is shown on the maps, the overall <br />length is approximately 4,600 feet. This proposed road location differs slightly from the original proposal in order <br />to allow for an entrance that has Beater visibility, thus increasing the safety for those using the road. The <br />beginning 1,600 feet of the access and light duty road is the segment that differs from the original proposal. <br />During constmction of the road, approximately 6,815 CY of topsoil will be 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 will be stockpiled adjacent to or windrowed to the side of the road. The stockpiled topsoil will be <br />seeded with the pastureland seed mixture applied at the appropriate rate. The finished width of the road will be <br />approximately 12 feet and it will be covered with approximately 9 to 12 inches of 6" pit run and 3 to 4 inches of 1 <br />• 1/2" road base or crashed rock. It is planned to install culverts along the road. For definition purposes, the <br />beginning 700 feet is an access road and the remaining 3,900 feet is a light-duty road. The design calculation for <br />these culverts, numbered EMD-I through EMD-4, is presented in Exhibit 8a, Culvert Sizing - EMD Dewatering <br />Facility Access Road. <br />• <br />MR06-207 2.05-77.1 04/25/06 <br />