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etc. It is understood that oily wastes will not be placed in the pit. The trash pit will be backfilled when it is no longer <br />needed. <br />The drillhole will be approximately 1,100 feet in depth and have a nominal diameter of 6.25 inches. The hole will be <br />drilled with air, water, foam, or mist, or any combination of these circulation media. Any excess water from drilling or <br />• minor ground water inflows will be passed through the mud pits before being discharged from the site. After the hole is <br />completed, it will be logged and then grouted from the bottom to within three feet of the surface. Apiece of rebar will <br />be placed in the top of three feet of the grout to act as a permanent marker, and the remainder of the hole will be <br />backfilled with soil. The required abandonment report will be submitted within 60 days to the Division. <br />TCC proposes to install an additional subsidence test site above the 3rd Southwest Panel to evaluate the possible effects <br />of surface subsidence from longwall mining on the base of a lattice-type electric transmission tower (MR95-125). The <br />site will consist of four buried concrete pilings, 18 inches in diameter, by 15 to 20 feet deep. Each piling will have a <br />survey marker placed in the top in order to measure any settlement caused by surface subsidence. <br />The site will be accessed by an existing road, except for a short segment from the road to the site. The drill rig will take <br />the shortest route between the road and the site. The holes will be drilled by auger, following topsoil salvage and <br />stockpiling. Cuttings from the holes will be raked back from the holes and scattered over the site. [n mid-1996, at the <br />conclusion of the study, the site will be excavated to allow removal of the upper portion of the pilings, the site will be <br />backfilled, regraded, retopsoiled, and seeded with the appropriate seed mixture. <br />The reclamation bonding calculations for this activity are included in Appendix A, Volume IA of the permit. <br />Twentymile Coal Company (TCC) does not plan to conduct underground mining operations within the Fish Creek <br />Tipple permit area. <br />EASTERN MINING DISTRICT <br />Addition of the Eastern Mining District added approximately 7,690 acres to the permit area, of which <br />approximately 2,600 affected surface acres are associated with the Eastern Mining District. The additional acreage <br />• was added to square up the permit area and accommodate future panels to the north of the Eastern Mining District. <br />The schedule for mining the Eastern Mining District and the remainder of the districts within the permit area is <br />provided on Map 23, Mine Plan. The existing portals will be used to gain access to the Eastern Mining District. It <br />is anticipated that the previously approved eastern portal will be fully developed to facilitate mining in this district. <br />Presently, only one of the two entries has been broken out to the surface. The second entry will be developed and <br />broken through when it is needed. <br />During the five-year permit term (1993 - 1998), mining will continue in the Southwest Mining District and extend <br />into Gateroads SR to IOR, the associated sub-main, the North Mains, and longwall Panels 9 Right through 7 Right. <br />The remaining five-year blocks are shown on Map 23. The surface ownership for the Eastern and first North <br />Mining Districts is shown on Map 1, Surface Ownership. The reader is referred to this map for location of the <br />parcels overlying the mine workings owned by various companies, individuals, or governmental entities. <br />The gateroads are comprised of three entries, typically driven on 100-foot centers, although the location of the entry <br />may vary depending upon ground control requirements as reflected in pillar widths between the entries. Including <br />the three 20-foot wide entries and 35 to 155 foot wide pillars, the gateroads will be approximately 230 feet in width. <br />Cross-cuts are developed on both 100 and 200 foot centers along the length of the entry, except in the vicinity of <br />the start and stop rooms where the cross-cut spacing is reduced. The sub-mains will have up to six entries driven <br />on 100 foot centers. As stated previously, the sub-mains driven off the north main may have up to seven entries, <br />plus a sump. Once the sub-mains are driven to the southeast, up to six entries will be established. The longwall <br />panels will have an 850-foot face and witl vary in length from approximately 10,000 feet to <br />• <br />TR06-52 2.05-16 05/23/06 <br />