PERMFILE60488 - Laserfiche WebLink

Home Browse Search

eleven holes (LW3-1 to LW3-11) were drilled in the longwall #3. Disturbance of the archaeological site 5RB859 was mitigated. Hole LW3-12 in the longwall #3 and holes LW4-1 to LW4-13 in longwall #4 were drilled in 1990. Holes LW4-14 to LW4-17 and LW5-1 to LW5-17 were drilled in 1991. Holes LW5-8 to LW5-15 and LW6-1 to LW6-3 were drilled during 1992. Vent holes LW6-4 to LW6-12 and LW7-3 to LW7-5 were drilled during 1993. Holes LW7-6, LW7- 8, LW7-10, LW8-2, LW8-3 and LW8-5 were drilled in 1994. LW7-1 and LW7-2 were permitted but not drilled because of the change in the start line location for LW-7. Holes LW7-7, LW7-9, LW8-1, LW8-4 and LW8-6 were permitted but not drilled. On January 31, 1996, the mine caught fire near LW-9 face. Emergency holes LW9-1 and LW9-2 were drilled to inject COZ. The working districts were eventually sealed. Drill hole LW9-3 was drilled to monitor mine gases and assess the fire condition. Vent hole LW10-1 through LW10-7 were drilled in 1997. Vent hole LW11-1 to LW11-4 were drilled in 1997. Vent holes LW11-6, LW12-1, LW12-3, and LW12-5 were drilled in 1998. When necessary, air pumps are installed at the wellhead to improve mine ventilation. Degasification holes are utilized as necessary to degas the underground workings. The vent holes located within Longwall Panels #1 through #12 are shown on Map 1, Surface Facilities Map and/or Map 147, Small Area Exemptions Location Map. Access to the locations are along existing roads and from there to hole locations by cross country at-grade access with minimal blade work only where necessary. • Red Wash crossing by heavy equipment during drilling will be across solid rock base, or gravel base if a solid rock base is not present. The two-track access to LW2-1 from LW2-2, is about 1/2-mile long. Part of the track is constructed around the side of a hill necessitating approximately 60 feet of the track to have a cut ranging up to 6 feet deep. The track width is maintained around 12 feet. The only disturbance of any significance was for the cut to be made on the side of the hill. Some rock blasting was required. The access route constructed was waterbarred to prevent erosion until abandonment. An 18-inch culvert was installed on the access road to welt LW2-1. The drill sites are about 100' x 100'. A site is formed by first salvaging available topsoil. The topsoil is stockpiled at one end of the drill site. Additional earthwork is minimized since the drill sites are usually relatively flat. A temporary mud pit is constructed next to the drill site. All suitable topsoil material is salvaged from the mud pit areas and placed in the topsoil stockpile. The mud pits are about 20' x 10' x 6'. Any runoff water and/or water/drilling mud mixture is generally collected in the mud pit. The mud pits effectively serve as the sediment control structures for the disturbance during drilling. Sediment control of the drill pad areas is achieved by • Midterm Review (8/2002) III-27