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... _ _ <br />~ ~.... . _ <br /> <br /> <br /> the endangered area of the mine, until changes and <br /> adjustments in the ventilation are made and the air in <br />• such aircourse contains less than 2.0 volume per centum <br /> of methane. <br /> 5. Abandoned areas such as outby sump areas and dead end <br /> entries shall be ventilated with at least perceptible <br /> air flow to maintain air quality to acceptable levels , <br /> as required by the 30 CFR 75. Air quantities in dead <br /> end entries shall be maintained as to dilute and carry <br /> away noxious and explosive gases. <br />• <br /> . `~'y. <br /> -`~! ~ <br /> ;.7 <br /> ~` <br /> :;j <br />. <br /> <br /> ``-f' <br /> gage 16 <br />