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• Southfield Mint Minor Rnision Regrttst No. 20 -South Fan Installation • 13 As pre-law features, no provision was made for drainage or erosion control on the associated disturbance areas. Upon completion of the limited construction activities required to extend the existing powerline, EFCI proposes to establish waterbars every 50-100 feet along the length of the powerline access road, as appropriate based on gradient. Road drainage from the powerline access road presently flows down and across the road, discharging to the heavily vegetated slope on the northeast side of the road. Installation of waterbars will not change the general location or direction of discharge, but will limit flow length and related erosion potential along the road. Upon completion of the erosion control work, EFCI proposes to block access to both the powerline access road and referenced unimproved road by placing either large rocks or earthen berms at the road entrances. • Stabilize Mine Entries and Construct Seals The existing fan entry for the Monarch No. 4 Mine will be utilized as the discharge airway for the proposed fan installation. In order to insure the long-term integrity of the airway and provide for effective airflow, EFCI will clean any loose rock or other debris from this entry, place timbers, rockbolts or other support as necessary, and construct permanent stoppings or seals on intermediate panel entries. It is anticipated that EFCI will construct 6 permanent seals as shown on the South Mine Fan Installation Map, (Map 30), to isolate the discharge airway from the connecting mine workings. Seals will be of approved MSHA design consistent with EFCI's existing ventilation plan. Areas inby the seals • will be timbered, bolted or otherwise supported to prevent caving which could affect the seals. A(2 /,K. • P.O. Bat 77b/8 • Sunmboa Spnng, Cob,cdo 40177. 1303/879-6160