MSHA - Code of Federal Regulations - 30 CFR 57.22226
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MSHA - Title 30 CFR
30 CFR § 57.22226
Testing for methane (IV mines).

Tests for methane shall be conducted in the mine atmosphere by a competent person--

(a) At least once each shift prior to starting work in each face and raise; and

(b) Upon initial release of gas into the mine atmosphere from boreholes.