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10/21/2804 13:87 19709295177 OXBDW MINE PAGE <br />Ss~rni • 2.05.4 <br />from the portal surface openings. The portal artries will rhea be backfilled from the Beak to the <br />portal opeaiogs wish soil and broken rock materials and portal and face•up areas backfilled and <br />graded to completely cover all portal stnrctures, establish a stable slope configuration, and eliminate <br />exposed highwall areas. A pemtaaeat shaft seal will be constructed/installed oa the GGulch <br />Ventilation Shaft in accordance with applicable provisions of Rule 4.07. Two options exist for shaft <br />sealing; <br />1. Approximately 2.5 feet of soil material was removed prior to shaft construction leaving the <br />shaft collar bekYw natural grade, A permanent reinforced concrete cap with vent pipe, <br />complying with applicable MSF£A. requirements, could be placed over the shaft opening. <br />2. A false deck could be established by installing lateral support beams into the ring beams <br />within the shaft collar and placing decking over the support beams ruing either steel plate or <br />expanded metal and reinforced concrete. The remainder of the collar would be bacltfr7led <br />with material previously excavated during shaft construction. <br />The preferred method will be deterrrrined through discussion with the DMG prior to final <br />reclamation and. implemented to assure effective shaft closure. All equipment, buildings and above <br />ground strurnues will be dismantled and removed from the site. All concrete foundations will be <br />demolished to at Ieast two feet below surface and the insulting concrete rubble wr1l be used as bac)tfdl <br />or buried in place. <br />Final baci~illiag cad grading will. be completed to creaze a stable final topography appropriate to the <br />postmining land use. The final topographic configuration of the Sanborn Creek Mine area is shown <br />by the Facilities Postmining Topography Map, (Maps 2.05•M6), and the Postmining Cross-Sections, <br />(Map Z95-M7). The erdsting highwall neu the portals will not be reclaimed since it is stable and is <br />also the cut slope for the existing road connecting the Sanborn Creek mad and old State Htghway <br />133, which will remain to provide long-term access following completion of mixing and recLlmation. <br />The culvert in Sanborn Creek cad the culvert near the mine portals will be left in place since they <br />provide necessary drainage control for the adjacent railroad bed, <br />Degasificatioa wells CBM 1 through CBIVx 15, and fire control and monitoring boreholes SCWP-1 <br />and SOGM-1 through SCGIvI.10 have bear or will be plugged cad sealed in accordance with <br />applicable provuions of Rule 4.07 and further described in Section 2.05.4. Associated surface <br />disturbance areas, including roads will be reclaimed in conjunction with reclamation of the Sanborn, <br />Creek Mme facilities areas once urining and/or degasification is the Sanborn Creek Mine has ceased. <br />The pre-disturbance land use of this area was undeveloped land and historic mining activities. The <br />affected lands wr7l:be reclaimed consistent with the undeveloped land use whr7e maiataitriog access <br />through the area and to adjacem public lands. As previously noted, the Saabom Creek road will be <br />retained to providelong-term access. <br />Soil Replacement - As previously discussed, there is a shortage of soil for replacement over the entire <br />disturbed area associated with the Somerset Mne area, which included portions of the Sanborn Creek <br />Mute area During construction of the Sanborn Creek surface facrlities, some soil material was <br />salvaged from area's. not previously disturbed and stockpiles. Since lirrrited topsoil is available, the <br />stockpiled soil material will be used in this area only if sampling indicates that sutficial materials are <br />not suitable as a revegetarion growth medium If soil is required, it wr71 be replaced oalyin those <br />areas where it is needed, replacement will be at a uniform depth of 6 to 12 inches, and the replaced <br />soil will be seeded and mulched as sooA. as possible following placement to m;n;.r,;~a the potential for <br />loss due to wind and water erosion. If soil is nor required is this area, available stockpiled soil <br />material will be used on other areas where it is needed to support final revegetation <br />Revegetation - In accordance with an agreement with the DMG, a vegetation study was conduced <br />for the Bear Cinek and Hubbard Creek disturbance areas and adjacent undisturbed areas during the <br />06 <br />'I'R _dR ~ na_~cr v._.:__.r n_...r,__ Anne <br />