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off the material and transported to Pond D and the cuttings either removed from the pit and transported to the refuse <br />_ pile or buried in place. The cover material will be pulled back over the pit area and compacted. <br />• An 8" steel pipe casing will be installed in the 13 %," hole and the annulus grouted to the surface. Rock dust will be <br />delivered to the underground workings via this hole. The annulus of the 2'/I' conduit pipe will also be grouted to the <br />surface. <br />Reclamation of the rockdust tank pad area has been outlined previously. Both of these additional holes will require <br />grouting to the surface and the casing removed at a minimum of 3' below grade on the surface. <br />Trout Creek Sandstone Test Area <br />Twentymile Coal Company is planning to drill test holes into the Trout Creek Sandstone to determine if it could yield <br />a sufficient quantity of water to a well. If the testing proves positive, TCC will submit a technical revision describing <br />the proposed facility and how it will tie into its existing water distribution system. <br />The location of the test area is shown on Map 24, Surface Facilities, sheet 2 of 2. As noted on the map, one drill site is <br />proposed for the area. At this site, two wells may be drilled, depending upon the outcome of the initial hole. <br />Topsoil will be salvaged from the pad prior to conducting the drilling operations. The drill pad is approximately 1.2 <br />acres in size, and as shown on map 24, it is shaped irregularly. Both test holes WT98001 and WT98002 may be <br />drilled from this pad. The pad is located in the Courtes soil series, and topsoil salvaged is anticipated to a depth of <br />approximately 21 inches. The SAE demonstration for this area is presented in Exhibit 8L, Trout Creek Sandstone <br />Test Hole Site. Across through the pad area is shown on Figure 21-A <br />The drilling of the holes will occur in two distinct phases. Test hole WT98001 is located down slope of the test hole <br />• WT98002 and will be drilled first. This results in stripping topsoil from the approximate south half of the site and <br />stockpiling it immediately above the abandoned road. A temporary berm will be constructed above the area from <br />which topsoil will be salvaged. In the event the second test hole is required, the remainder of the pad will have topsoil <br />salvaged and stockpiled as shown on Map 24. A bean will then be constructed above the area from which topsoil will <br />be salvaged. By conducting the test drilling th two distinct phases, the potential exists to minimize disturbance at the <br />site. However, the SAE demonstration addresses the worst case situation and no further SedCad work will be required <br />in the event the site is developed fully. <br />The pad will be leveled to accommodate the drill rig and then mud pits will be excavated within the pad area to <br />accommodate drilling fluids and water produced from the hole. In the event excessive water is encountered, it will be <br />Vansported to an existing sediment pond located at TCC's facilities. Also, a berm will be constructed around the <br />qtr of the pad to keep overland flow from entering the pad. <br />vum~ <br />The first hole to be drilled will be done with a rotary rig, and it is anticipated the total depth of the hole will be 825 <br />feet. The fast 60 feet of the boring will be 10'/."; from 60 feet to approximately 7 ] 5 feet the hole will be 7 7!8"; and <br />the remainder of the hole will be 4 13/16"'. The second hole will have the same construction except that it may be <br />drilled at a 20° angle. The total depth will be approximately 800 feet, although the length of the hole will be <br />approximately 1090 feet. <br />For each hole, a 60 foot section of surface casing (8 5/8" OD) will be set and grouted in place. For the next interval, 5 <br />9/16" casing will be set and grouted to within 10 feet of the top of the Trout Creek Sandstone. If sufficient water is <br />encountered in the Trout Creek, it will be screened and set up as a water supply well. <br />Once the construction of the well has been completed, it will be developed and then a pump test may be run to <br />determine yield. In the event the test hole is fumed into a supply well, the majority of the site will be reclaimed. The <br />reclamation activities will include backfilling of pits, regrading as needed, topsoil replacement and seeding, with <br />A)i•'PL4~br~7 PJOV 1 2 1998. <br />MR 98-161 2.05-65.1 11/3/98 <br />