Laserfiche WebLink
the remainder of the shaft will be filled with inert material including the shaft cuttings and collaz excavation materials. A <br />cement plug will be powed from 10 feet below grade to within approximately 3 feet of the surface. The remaining 3 feet <br />will be filled with soil and graded to blend with the surrounding terrain. <br />• As noted on page 2.05-45.4, any required pressure-grout boreholes will be sealed at the time of construction. <br />Cement grout will be pumped through the boreholes to seal any wet zones encountered and the boreholes will be <br />filled with grout and allowed to set-up on completion of grouting operations. Any swface casing extending above <br />ground surface would be cut-off flush with or below natwal ground level. <br />Following removal of structwes and equipment, and plugging and sealing of the shaft; any cuttings remaining in the <br />temporary mine waste disposal pit will be covered with excavated shaft collaz material; road culverts will be removed <br />and disposed of off-site; road-base and surfacing materials will be removed and placed on the shaft pad; and the shaft <br />pad and access road disturbance areas will be regraded to reestablish effective drainage and blend with the surrounding <br />terrain. Cover over any cuttings remaining in the cuttings pit will be a minimum of 2 feet of suitable material, and the <br />postmining configuration will approximate the premising contours. As-built certification will be provided to the <br />CDMG following final closwe, backfilling, and grading of the cuttings pit. Any excess road-base and surfacing <br />materials not required to reestablish approximate original contow will be hauled off-site and disposed o£ Stockpiled and <br />windrowed topsoil will then be replaced on those distwbed azeas where it was previously removed and seeded with a <br />pastureland seed mixture. <br />6-Main North Ventilation Shaft fl'ROS-48. MR06208, MR06-210, MR06-212) <br />When the 6-Main North Ventilation Shaft and supporting equipment and boreholes are no longer required to support <br />ongoing or futwe mining operations, the associated surface facilities will be removed, the shaft will be plugged and <br />sealed, and surface distwbance azeas will be reclaimed. The supporting equipment and any structural steel or tanks will <br />be removed and reused at another locale, salvaged, or disposed of off site. Buried utilities will be stubbed-off below <br />grade and abandoned. Concrete pads will be broken up, and foundations will be demolished to at least 2 feet below <br />grade, and the resulting concrete debris will be disposed of in the shaft opening. The shaft collar concrete will also be <br />'~ broken up and disposed of into the shaft opening, leaving an open space for the concrete slab and backfill material/shaft <br />cuttings to be placed in the shaft void. A cement plug will be placed in the bottom 15 feet of the shaft and the remainder <br />of the shaft will be filled with inert material including the shaft cuttings and collaz excavation materials. A cement plug <br />will be powed from ten feet below Bade to within approximately 3 feet of the swface. The remaining 3 feet will be <br />filled with soil and graded to blend with the surrounding terrain. <br />As noted on page 2.05-45.5, any required presswe-grout boreholes will be sealed at the time of construction. <br />Cement grout will be pumped through the boreholes to seal any wet zones encountered and the boreholes will be <br />filled with grout and allowed to set-up on completion of gouting operations. Any surface casing extending above <br />ground surface would be cut-off flush with or below natural ground level. Utility boreholes will be plugged, filled to <br />within 10 feet of the ground surface with inert material, and a cement plug will be powed from the top of the fill to <br />within approximately 3 feet of the swface. Any swface casing will be cut-off below grade, and the remaining hole <br />will be filled with soil material and graded to blend with the surrounding terrain. <br />Following removal of structwes and equipment, and plugging and sealing of the shaft and boreholes, any cuttings <br />remaining in the temporary mine waste disposal pit will be covered with excavated shaft collar material; road culverts <br />will be removed and disposed of off-site; road-base and surfacing materials will be removed and placed on the shaft pad; <br />and the shaft pad and access road distwbance areas will be regraded to reestablish effective drainage and blend with the <br />surrounding terrain. Cover over any cuttings remaining in the cuttings pit will be a minimum of 2 feet of suitable <br />material, and the postmining configwation will approximate the preanining contours. As-built certification will be <br />provided to the CDMG following fmal closwe, backfilling, and grading of the cuttings pit. Any excess road-base and <br />surfacing materials not required to reestablish approximate original contow will be hauled off-site and disposed of. <br />Stockpiled and windrowed topsoil will then be replaced on those distwbed areas where it was previously removed and <br />seeded with a pastweland seed mixtwe. <br />• <br />TR07-59 2.05 - 106 03/26/07 <br />