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8.0 The method of ventilating the mine during sealing shall <br /> be via natural ventilation since disassembly of surface <br /> electrical sub-stations has commenced and electrical <br /> power is no longer available for mine ventilation and <br /> mine ran operation. <br /> 9.0 Whenever sealing is being done, a certified person shall <br /> be present at all times and sealing operations will only <br /> proceed provided that the ambient methane content of the <br /> atmosphere in the sealing location is less than 1.0 <br /> percentum by volume and the ambient atmospheric <br /> conditions are such that the sustained combustion of a <br /> flame safety lamp is supported at all times. <br /> 9. 1 The certified person will take methane checks every 20 <br /> minutes at the sealing location. A flame safety lamp <br /> will be continuously lit, hung, and monitored by the <br /> certified person in the sealing location. <br /> 9.2 All sealing work will stop if the methane level exceeds <br /> 1.0 percentum and the sealing crews removed from the <br /> portal areas. Sealing will not resume until the methane <br /> level is less than 1. 0 percentum by volume. <br /> 9. 3 If the methane level exceeds 1.0 percentum by volume, <br /> ventilation controls, i.e. line brattice will be erected <br /> within the unsealed mine portals redirecting the mine's <br /> natural ventilation such that the methane levels in the <br /> sealing location are maintained less than 1 percentum by <br /> volume. <br /> 9.4 If the atmosphere at the sealing location will not <br /> support sustained combustion of a flame safety lamp all <br /> personnel will be withdrawn from the sealing location. <br /> 9. 5 If the atmosphere at the sealing location will not <br /> support sustained combustion of a flame safety lamp work <br /> will not be resumed until line brattice is erected within <br /> the unsealed mine portals to redirect the mine's natural <br /> ventilation such that the atmosphere in the sealing <br /> location will support sustained combustion of a flame <br /> safety lamp. <br /> 10.0 The entrance gate to the property shall be locked except <br /> when used by authorized personal, prohibiting casual <br /> access to the mine site. <br /> 10. 1 Accessways to portal areas will by posted with signs <br /> provided by the State of Colorado Division of Mines <br /> warning of the dangers of entering mine openings. <br /> 10. 2 Portals not immediately sealed under this plan will be <br /> Mid-Continent, Mine <br /> Sealing Plan - 3 - <br />