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Seneca Coal Company Highwal] Mining Addendum MSHA I.D. OS-00304 March ]5, 2004 • 6. Hole Completion /Closure Afrer the mining process in each entry has been completed and the machinery moved to the to the next entry, Seneca Coal Company is responsible for blocking the enties with suitable fill material. A maximum of 300 ft of unblocked entries closest to the active entry will remain open for observation of the web pillars for detection of any signs of movement. E. Ventilation Methane -The miner has a methane monitor system that is approved by the Secretary and is displayed at the operator's station indicating percentage of methane/air mixture. Methane concentrations are continuously displayed on a monitor in the operator's compartmem. This system is designed with a monitoring system that gives a warming at 1 % methane concentration and automatically de-energies the miner should it be exposed to a methane concentration of 2% or Beater. Seneca Coai Company does not anticipate high levels of methane. (a) If an indicator is indicating 1 % methane, the cutter head will be lowered to the center of the seam, and the machine shut down. All launch personnel will be removed from the immediate area, and a methane examination will be conducted • at the cut opening. The conveyor system will remain in operation. Internal combustion engines will not be operated in the vicinity of the highwall mining opening during the surface methane examination. (b) Methane levels are digitally displayed in the operator's compartment. When methane levels at the cutterhead have dispersed, another methane examination will be conducted at the cut opening using an extendable probe. Work will be able to continue as long as methane levels remain below 1 %. (c) If methane levels in excess of 1% are encountered a second time while mining a cut, procedures (a) and (b) above will be repeated. (d) In the event the methane monitor shuts down the machine (indicating 2% methane), or if a 1 % reading continues for a sustained period after implementing procedures (a) and (b) above, all undergound equipment will be de-energized and removed from the cut. De-energized equipment wi17 be pulled from the hole using hydraulic cylinders on the launch vehicle. The cut will be abandoned. (e) The method of performing the tests for methane at the cut opening will be determined by the position of the launch vehicle. At all times, the person performing the test will remain under the protective canopy. (f) Methane monitor sensors on the mining unit will be visually inspected and • cleaned prior to each cut. The methane monitors will be calibrated at ]east once every 31 days.