Section 61.125 - Test methods and procedures(a) Each owner or operator of a source required to test emissions under § 61.123 , unless an equivalent or alternate method has been approved by the Administrator, shall use the following test methods:(1) Method 1 of appendix A to 40 CFR part 60 shall be used to determine sample and velocity traverses;(2) Method 2 of appendix A to 40 CFR part 60 shall be used to determine velocity and volumetric flow rate;(3) Method 3 of appendix A to 40 CFR part 60 shall be used for gas analysis;(4) Method 5 of appendix A to 40 CFR part 60 shall be used to collect particulate matter containing the polonium-210; and(5) Method 111 of appendix B to 40 CFR part 61 shall be used to determine the polonium-210 emissions.54 FR 51699, Dec. 15, 1989, as amended at 65 FR 62156 , Oct. 17, 2000