Laserfiche WebLink
Salim 2.02.2 <br />will be inspected to obt <br />• evaluation and analysis, and <br />reclaimed, az appropriate. <br />approximately 0.5 acres. <br />Drillsite Construction <br />am necessary information, grab samples may be obtained for further <br />the trench will then be filled back in and associated disturbance areaz <br />Maximum disturbance area for trench exploration is expetted to be <br />Most drilling can be conduced with minimal site preparation, since the drill can be set-up and leveled <br />using self-contained h}draulic jacks. Where site preparation is necessary due to rugged terrain or the <br />need to utilize drilling fluids, a pad approximately 40 feet in width and 100 feet in length will be <br />established. Pad preparation will involve the use of a tracked dozer or backhce to remove and <br />stockpile topsoil material in windrows on the perimeter of the pad for eventual replacement and <br />revegetation, and to establish a level drill site within the stripped area. <br />If feazible, based on hole depth and drilling conditions, portable piu or tanks will be utilized to mix <br />and contain necessary drilling fluids. If greater pit capaury is required than would be feasible using <br />porcable uniu, mud piu for the containment of drilling fluids and cuttings will be construtted within <br />the pad area. Each pit will be a maximum of 20 feet in length, 4 feet in width and S feet deep (23.7 <br />cubic yards each). Mud piu will be excavated with a backhce to allow segregation of available soil <br />materials. Maximum disturbance area for each drill site is expeced to be approximately 0.1 acres. <br />Drilline and Related Activities <br />All drilling and related operations will be conduced by experienced drillers in such a way as to <br />~*+i~imi~e potential envirorm~ental impacu and will be supervised by a qualified geologist or engineer <br />• Because of required drilling depths, OMI does not generally drill pilot holes to identify coring <br />intervais. Rather, coring begins above the target interval based upon available geologic information. <br />Coring is utilized primarily to quantify coal depth, thickness, and quality, parting thickness, and <br />location; and to characterize coal seam roof and floor materials. Core samples are recovered, logged, <br />and sent to a laboratory for analysis. <br />During drilling, OMI will control dust from drilling and related activities, diver and control both <br />natural runoff from disturbed areas and fluid loss from drilling, and will clean-up any trash or debris. <br />If air is utilized az the circulation medium, dust from drilling will be controlled by a flexible shroud at <br />the drill collar. Drill cuttings and drilling fluids will be effectively contained by portable piu or mud <br />piu within the drill pad area. <br />Site Reclamation <br />Where the need exisu for additional groundwater monitoring infomration, dtillholes may be <br />completed az monitoring wells. Upon completion of drilling and related activities, any drillhole not <br />completed az a monitoring well will be backfilled, sealed and abandoned. During drilling, fluid return <br />will be monitored to identify the depth and extent of any water-producing zones. Upon <br />abandonment, a cement grout seal will be established, extending 20 feet above and below any such <br />zones. A cement plug will be established from the top of the backfill to within three (3) feet of the <br />surface, a metal post will be placed in the hole az a permanent marker, and the remaining interval will <br />be backfilled with soil material to the ground surface. All trash and debris will be removed from drill <br />sites for disposal and any excess cuttings will be spread over the site. <br />• Both drill sites and trenched areas will be reclaimed in essentially the same manner after drillhole <br />sealing. Excavations, including both mud piu and trenches will be backfilled. Whew mud piu are <br />necessary, they will be allowed to dry out and will be backfilled with drill cuttings and/or previously <br />excavated material. During backfilling, an effort will be made to replace excavated materials in <br />approximately the same sequence that they were removed and the material will be compatted az its <br />PR04 2.02-3 Revised May 2001 <br />