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power borehole pad and reclaimed road segments will be seeded with the pastureland seed mixture. The entire road <br />will be chisel -plowed after removing the geotextile. <br />Drillhole or Well Plugging and Sealing, and Well and Pipeline Reclamation and Abandonment - All <br />drillholes will be plugged, sealed, and abandoned unless they are converted for long-term use as a monitoring or <br />water -supply well. Deeper drillholes will be plugged with a minimum of 6 cubic yards (about 750 feet) of <br />cement slurry — this is the off-road transport capacity of a cement truck. Shallower drillholes will be plugged <br />with between 3 and 5 cubic yards of cement slurry (as appropriate). The cement slurry will be tremied into the <br />drillhole from the bottom of the hole, up through the target units. This will effectively plug and seal all coal <br />beds and potential groundwater aquifers to prevent vertical groundwater migration and cross -contamination of <br />aquifers. <br />Any remaining open drillhole interval will be filled with other suitable plugging material (plug gel or vendor - <br />specific grout compounds) and/or drill cuttings to within 5 feet of the ground surface and the drillhole will be <br />sealed with a surface plug consisting of at least 5 feet of cement or other suitable permanent plugging material. <br />Surface casing will be cut-off at or below grade. Reclaimed drillhole locations will be marked with either a steel <br />fence post or a metal survey cap at, or below, ground level (used where agricultural cropping occurs). All <br />drillhole locations will be accurately surveyed, and distinctly numbered, allowing for future identification. <br />Abandonment reports will be prepared and filed, as required by applicable regulations. Similarly, monitoring <br />wells, when no longer needed, will be plugged, sealed, and abandoned in essentially the same manner, with the <br />Stipulation that cement slurry will be used for plugging the well. <br />All pipelines will be plugged and abandoned in-place. Pipelines will be drained, cut-off at least 3 feet below the <br />natural or reclaimed surface, plugged or capped, and the plugged ends will be buried. Any access manholes or <br />monitoring pipes or equipment will be removed, and any associated excavations will be backfilled and regraded, <br />followed by soil material replacement and revegatation. <br />Exploration Disturbance <br />Following completion of exploration activities (drilling, sampling, and geophysical logging) for each <br />exploration site, any drillholes not converted to monitoring wells will be plugged, sealed and abandoned, as <br />previously described, and exploration disturbance will be reclaimed. Site reclamation will follow completion of <br />exploration activities for each site as soon as reasonably practical, recognizing however, that certain reclamation <br />activities may be coordinated to take advantage of equipment and personnel availability. The following <br />summarizes the steps and general sequence for reclamation of exploration disturbance areas: <br />1) On completion of exploration activities at a given site, all trash, debris, and exploration equipment and <br />supplies will be removed from the site <br />2) For drill -sites, excess drilling fluids may be pumped from mud pits for off-site disposal, and the mud <br />pits allowed to dry -out. Mud pits or excavated trenches will be backfilled with the excavated material <br />and compacted to minimize any settling. Any excess drill cuttings will be spread over the drill -pad, and <br />drill -pads, trenched areas, and any new access road segments graded to approximate their original <br />configuration and blend with the adjacent terrain. <br />3) Stockpiled or windrowed topsoil will be redistributed at a uniform thickness over disturbed areas. <br />4) Disturbed areas will be reseeded to stabilize the surface and control erosion using the following seed <br />mix, or a mixture developed in consultation with the appropriate landowner or as specified by the <br />CDOW (for areas with state surface ownership). Replaced topsoil will be scarified prior to seeding, and <br />areas will be drill or broadcast seeded at the prescribed rates. A harrow or similar implement will be <br />used to drag the surface and cover the seed following seeding. <br />Seeding of reclaimed exploration sites will occur during the first favorable seeding period (typically late fall <br />[preferred], or early spring) following completion of site reclamation. <br />MR16-297 2.05— 106.3 06/06/16 <br />