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• 10-5/8 inch holes (LW2-1 to LW2-8, LW2-48 and LW2-613) were drilled in the longwall #2 and <br />eleven holes (LW3-1 to LW3-11) were drilled in the longwall #3. Disturbance of the archaeological <br />site 5RB859 was mitigated. Hole LW3-12 in the longwall #3 and holes LW4-1 to LW4-13 in <br />longwall #4 were drilled in 1990. Holes LW4-14 to LW4-17 and LW5-1 to LW5-17 were drilled in <br />1991. Holes LW5-8 to LW5-15 and LW6-1 to LW6-3 were drilled during 1992. Vent holes LW64 <br />to LW6-12 and LW7-3 to LW7-5 were drilled during 1993. Holes LW7-6, LW7-8, LW7-10, LW8-2, <br />LW8-3 and LW8-5 were drilled in 1994. LW7-1 and LW7-2 were permitted but not drilled because <br />of the change in the start line location for LW-7. Holes LW7-7, LW7-9, LW8-1, LW84 and LW8-6 <br />were permitted but not drilled. On January 31, 1996, the mine caught fire near LW-9 face. <br />Emergency holes LW9-1 and LW9-2 were drilled to inject CO2. The working districts were <br />eventually sealed. Drill hole LW9-3 was drilled to monitor mine gases and assess the fire <br />condition. Vent hole LW10-1 through LW10-7 were drilled in 1997, LW11-1 to LW11-4 in 1997, <br />LW11-6, LW12-1, LW12-3, and LW12-5 in 1998, LW67-1 thru LWB74 in 2005, LWB9-2 and <br />LW139-3 in 2007, and LWB10-1 thru LWB10-4 in 2008. Degasification holes are utilized as <br />necessary to ventilate longwall gob gasses from active panels and mining districts. <br />In 2007 a spontaneous combustion event forced extensive drilling to locate and control the <br />resulting fire. Nineteen drill holes on 18 drill pads were constructed to address this issue (SC-xxxx <br />holes). A skid mounted nitrogen generating unit with compressors was installed at RDH-3 with a <br />3" surface pipeline (6900') strung to SC-HG20, SC-HG26, and SC-HG33. A 575 foot 2" pipeline <br />was strung to SC-HG11. Nitrogen is injected to help inert the mined out areas. <br />Nitrogen injection and monitoring holes are required by MSHA for subsequent longwall panels. <br />N7-53, N8-51, N8-36, N8-21, and N9-56 were drilled to the 7th 8th and 9th Left entries. 7,290 feet <br />of 3" surface pipeline was placed to carry nitrogen to these holes. <br />Drill locations are shown on Map 147. Accesses to the locations are along existing roads and by <br />cross country access with minimal blade work only where necessary. <br />The two-track access to LW2-1 from LW2-2, is about 1/2-mile long. Part of the track is <br />constructed around the side of a hill necessitating approximately 60 feet of the track to have a cut <br />ranging up to 6 feet deep. The track width is maintained around 12 feet. The only disturbance of <br />any significance was for the cut to be made on the side of the hill. Some rock blasting was <br />required. An 18-inch culvert was installed on the access road to well LW2-1. <br />The drill sites are about 100' x 100'. A site is formed by first salvaging available topsoil. The <br />topsoil is stockpiled at one end of the drill site. Additional earthwork is minimized since the drill <br />sites are usually relatively flat. A temporary mud pit is constructed next to the drill site. All suitable <br />• Minor Revision #140 (7/2009) 111-2 7