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<br />Southfield Mine Minor Revision Request No. IO -South Fan Installation • 13 <br />As pre-law features, no provision was made for drainage or erosion control <br />on the associated disturbance areas. Upon completion of the limited <br />construction activities required to extend the existing powerline, EFCI <br />proposes to establish waterbars every 50-100 feet along the length of the <br />powerline access road, as appropriate based on gradient. Road drainage <br />from the powerline access road presently flows down and across the road, <br />discharging to the heavily vegetated slope on the northeast side of the road. <br />Installation of waterbars will not change the general location or direction of <br />discharge, but will limit flow length and related erosion potential along the <br />road. <br />Upon completion of the erosion control work, EFCI proposes to block <br />access to both the powerline access road and referenced unimproved road <br />• by placing either large rocks or earthen berms at the road entrances. <br />Stabilize Mine Entries and Construct Seals <br />The existing fan entry for the Monarch No. 4 Mine will be utilized as the <br />discharge airway for the proposed fan installation. In order to insure the <br />long-term integrity of the airway and provide for effective airflow, EFCI will <br />clean any loose rock or other debris from this entry, place timbers, <br />rockbolts or other support as necessary, and construct permanent stoppings <br />or seals on intermediate panel entries. <br />It is anticipated that EFCI will construct 6 permanent seals as shown on the <br />South Mine Fan Installation Map, (Map 301, to isolate the discharge airway <br />from the connecting mine workings. Seals will be of approved MSHA <br />design consistent with EFCI's existing ventilation plan. Areas inby the seals <br />• will be timbered, bolted or otherwise supported to prevent caving which <br />could affect the seals. <br />AQ lrt~. • P.O. Bar TIb/d • Sremndaar Sprtngt, Cobmdo 40477• (303/879-6160 <br />