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percentum by volume or more oxygen and lese than 1 .0 <br /> percentum by volume methane. <br /> 9.4 Mechanical ventilation if installed shall be by a powered <br /> ventilation fan utilizing 12 inch or larger diameter <br /> tubing. Ventilation provided by mechanical means to the <br /> working place shall equal or exceed 3000 efm. <br /> 10. 0 The entrance gate to the property shall be locked except when <br /> used by authorized personal , prohibiting casual access to the <br /> mine site. <br /> 10 .1 Access ways to portal areas will by posted with signs <br /> provided by the State of Colorado Division of Mines <br /> warning of the dangere of entering mine openings . <br /> 10 .2 Portals not immediately sealed under this plan will be <br /> fenced or otherwise barricaded and signed to warn of the <br /> dangers of approaching or entering mine openings, weather <br /> and access permitting . <br /> 11 .0 After final approval of the sealing plan has been given, the <br /> local MSHA office at Glenwood Springs, will be kept informed <br /> of all progress during the sealing process, via weekly <br /> progress reports submitted by tele-facsimile transmission or <br /> U.S. Mail . <br />