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© Dri[lsite Construction -Most drilling can be conducted with minimal site prepazation, since the <br />drill can be set-up and leveled using self-contained hydraulic jacks. Where site prepazation is <br />necessary due to rugged terrain or the need to utilize drilling fluids, a pad approximately 40 feet <br />in width and 100 feet in length will be established. Pad prepazation will involve the use of a <br />tracked dozer or backhoe to remove and stockpile topsoil material in windrows on the <br />perimeter of the pad for eventual replacement and revegetacion, and to establish a level drill site <br />within the stripped azea. <br />u <br />I <br />If feasible, based on hole depth and drilling conditions, portable metal piu will be utilized to <br />mix and contain necessary drilling fluids. If greater pit capacity is required than would be <br />feasible using portable pits, mud pits for the containment of drilling fluids and cuttings will be <br />constructed within the pad azea. Each pit will be a maximum of 20 feet in length, 4 feet in <br />width and S feet deep (23.7 cubic yazds each). Mud pits will be excavated with a backhoe to <br />allow segregation of available soil materials. Maximum disturbance azea for each drill site is <br />expected to be approximately 0.1 acres. <br />Drilling and Related Activities -All drilling and related operations will be conducted by <br />experienced drillers in such a way as to minimize potential environmental impacu and will be <br />supervised by a qualified geologist or engineer <br />Because of required drilling depths, OMI does not generally drill pilot holes to identify coring <br />intervals. Rather, coring begins above the tazget interval based upon available geologic <br />information. Coring is utilized primarily co quantify coal depth, thickness, and quality; <br />parting thickness, and location; and to characterize coal seam roof and floor materials. Core <br />samples are recovered, logged, and sent co a laboratory for analysis. <br />During drilling, OMI will control dust from drilling and related activities, divert and control <br />both natural runoff from disrurbed azeas and fluid loss from drilling, and will clean-up any <br />trash or debris. If air is utilized as the circulation medium, dust from drilling will be controlled <br />by a flexible shroud at the drill collar. Drill cuttings and drilling fluids will be effectively <br />contained by portable piu or mud pits within the drill pad azea. <br />Site Reclamation -Where the need exisu for additional groundwater monitoring information, <br />drillholes may be completed as monitoring wells. Upon completion of drilling and related <br />activities, any drillhole not completed as a monitoring well will be backfilled, sealed and <br />abandoned. During drilling, fluid rerurn will be monitored to identify the depth and extent of <br />any water-producing zones. Upon abandonment, a cement grout seal will be established, <br />extending 20 feet above and below any such zones. The remainder of the drillhole will be <br />backfilled with drilling mud and/or cuttings co within 20 feet of the surface. A cement plug <br />will be established from the top of the backfill to within three (3) feet of the surface, a metal <br />post will be placed in the hole as a permanent mazker, and the remaining interval will be <br />backfilled with soil material to the ground surface. All trash and debris will be removed from <br />drill sites foc disposal and any excess cuttings will be spread over the site. <br />Both drill sites and trenched azeas will be reclaimed in essentially the same manner after <br />drillhole sealing. Excavations, including both mud piu and trenches will be backfilled. Where <br />mud piu aze necessary, they will be allowed to dry out and will be backfilled with drill cuttings <br />and/or previously excavated material. During backfilling, an effort will be made to replace <br />excavated materials in approximately the same sequence that they were removed and the <br />material will be compacted as it is replaced, by running the equipmeat over the backfilled azea <br />during placement of successive lifu. Following backfilling, disturbance areas will be graded to <br />approximately their original configuration and drainage will be reestablished. If the drill site or <br />rn„nru c.. v nw <br />9/I/9Ih1 <br />