Section 77.101 - Tests for methane and for oxygen deficiency; qualified person(a) The provisions of Subparts C, P, R, and T of this Part 77 require that tests for methane and for oxygen deficiency be made by a qualified person. A person is a qualified person for these purposes if he is a certified person for such purposes under § 77.100 .(b) Pending issuance of Federal standards, a person will be considered a qualified person for testing for methane and oxygen deficiency:(1) If he has been qualified for this purpose by the State in which the coal mine is located; or(2) If he has been qualified by the Secretary for these purposes upon a satisfactory showing by the operator of the coal mine that each such person has been trained and designated by the operator to test for methane and oxygen deficiency. Applications for Secretarial qualification should be submitted in writing to the Mine Safety and Health Administration, Certification and Qualification Center, P.O. Box 25367, Denver Federal Center, Denver, Colo. 8022536 FR 9364, May 22, 1971, as amended at 43 FR 12320, Mar. 24, 1978