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10 -5/8 inch holes (LW2 -1 to LW2 -8, LW2 -413 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 and holes LW4 -1 to LW4 -13 were drilled in 1990. <br />Holes LW4 -14 to LW4 -17 and LW5 -1 to LW5 -17 were drilled iin 1991. Holes LW5 -8 to LW5 -15 <br />and LW6 -1 to LW6 -3 were drilled during 1992. Vent holes LW64 to LW6 -12 and LW7 -3 to LW7 -5 <br />were drilled during 1993. Holes LW7 -6, LW7 -8, LW7 -10, LW8 -2, LW8 -3 and LW8 -5 were drilled in <br />1994. LW7 -1 and LW7 -2 were permitted but not drilled because of the change in the start line <br />location for LW -7. Holes LW7 -7, LW7 -9, LW8 -1, LW84 and LW8 -6 were permitted but not drilled. <br />On January 31, 1996, the mine caught fire near LW -9 face. Emergency holes LW9 -1 and LW9 -2 <br />were drilled to inject CO2. The working districts were sealed. Hole LW9 -3 was drilled to monitor <br />mine gases and assess fire conditions. Vent hole LW10 -1 thru 7 were drilled in 1997, LW11 -1 <br />thru 4 in 1997, LW11 -6, LW12 -1, 3, and 5 in 1998, LWB7 -1 thru 4 in 2005, LW139 -2 and 3 in 2007, <br />LWB10 -1 thru 4 in 2008, LWB11 -1 thru 4 in 2009, LWB12 -1A thru 5 in 2011, LW1313 -1 thru 5 in <br />2013, and LWB14 -1 thru 5 in 2015. Degasification holes are utilized as necessary to ventilate <br />longwall gob gasses from active panels and mining districts. <br />Spontaneous combustion forced extensive drilling to locate and control the resulting fire in 2007. <br />Nineteen drill holes on 18 drill pads were constructed to address this issue (SC -xxxx holes). A <br />containerized nitrogen unit with buildings and compressors were installed at RDH -3 (see Map 155) <br />with a 2 and 3" surface pipeline strung to various drill holes. A second nitrogen plant was installed <br />south of Slot Storage in 2014 (Map 159). Nitrogen is injected to help inert the mined out areas. <br />MSHA requires nitrogen injection /monitoring holes for current longwall panels. N7 -53; N8 -12, 21, <br />36, 51, 55; N9 -12, 26, 38, 57, 62; N1 0-12, 26, 38, 53, 62; N 11 -15, 28, 43, 58,71; N 12 -12, 26, 38, <br />53, and 60 were drilled to the 7th thru 12th Left entries. 43,000 feet of 2, 3 or 4" plastic surface <br />pipeline carries nitrogen to these holes. <br />Drill locations are shown on Map 147. Access to the locations are along existing roads where <br />feasible. New light use roads are constructed where necessary. <br />The two -track access to LW2 -1 from LW2 -2 is about 1/2 -mile long. Part of the track is constructed <br />around the side of a hill necessitating approximately 60 feet of the track to have a cut ranging up <br />to 6 feet deep. The track width is maintained around 12 feet. The only disturbance of any <br />significance was for the cut to be made on the side of the hill. Some rock blasting was required. <br />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 />Minor Revision #163 (01/2015) III -27 <br />