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42 U.S.C. 7401 et seq.
57 FR 61992, Dec. 29, 1992, unless otherwise noted.
64 FR 53038, Sept. 30, 1999, unless otherwise noted.
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(a) [Reserved]
(b) Test methods. You must use the following test methods to determine compliance with the emissions standards of this subpart:
(1) Dioxins and furans.
(i) To determine compliance with the emission standard for dioxins and furans, you must use:
(A) Before June 3, 2029, EPA Method 0023A, Sampling Method for Polychlorinated Dibenzo-p-Dioxins and Polychlorinated Dibenzofurans emissions from Stationary Sources, EPA Publication SW-846 (incorporated by reference—see § 63.14). After June 3, 2029, EPA Method 0023A is no longer allowed; or
(B) EPA Method 23 of appendix A-7 to part 60 of this chapter.
(ii) You must sample for a minimum of three hours, and you must collect a minimum sample volume of 2.5 dscm;
(iii) You may assume that nondetects are present at zero concentration.
(2) Mercury. You must use EPA Method 29 of appendix A-8 to part 60 of this chapter to demonstrate compliance with emission standard for mercury.
(3) Cadmium and lead. You must use EPA Method 29 of appendix A-8 to part 60 of this chapter to determine compliance with the emission standard for cadmium and lead (combined).
(4) Arsenic, beryllium, and chromium. You must use EPA Method 29 of appendix A-8 to part 60 of this chapter to determine compliance with the emission standard for arsenic, beryllium, and chromium (combined).
(5) Hydrogen chloride and chlorine gas —
(i) Compliance with MACT standards. To determine compliance with the emission standard for hydrogen chloride and chlorine gas (combined), you must use:
(A) EPA Method 26 or 26A of appendix A-8 to part 60 of this chapter; or
(B) EPA Method 320 or 321 of appendix A to this part for hydrogen chloride and the back-half, caustic impingers of EPA Method 26 or 26A of appendix A-8 to part 60 of this chapter to measure chlorine gas.
(C) [Reserved]
(ii) Compliance with risk-based limits under § 63.1215. To demonstrate compliance with emission limits established under § 63.1215, you must use EPA Method 26 or 26A of appendix A-8 to part 60 of this chapter, EPA Method 320 of appendix A to this part, or EPA Method 321 of appendix A to this part.
(A) For cement kilns and sources equipped with a dry acid gas scrubber, you must use EPA Method 320 or 321 of appendix A to this part to measure hydrogen chloride, and the back-half, caustic impingers of EPA Method 26 or 26A of appendix A-8 to part 60 of this chapter to measure chlorine gas; and
(B) For incinerators, boilers, and lightweight aggregate kilns, you must use EPA Method 320 or 321 of appendix A to this part to measure hydrogen chloride, and EPA Method 26 or 26A of appendix A-8 to part 60 of this chapter to measure total chlorine, and calculate chlorine gas by difference if:
(1) The bromine/chlorine ratio in feedstreams is greater than 5 percent; or
(2) The sulfur/chlorine ratio in feedstreams is greater than 50 percent.
(6) Hydrogen fluoride. To determine compliance with the emission standard for hydrogen fluoride gas, you must use:
(A) EPA Method 26 or 26A of appendix A-8 to part 60 of this chapter; or
(B) EPA Method 320 of appendix A to this part.
(7) Hydrogen cyanide. To determine compliance with the emission standard for hydrogen cyanide gas, you must use:
(A) EPA Method 320 of appendix A to this part; or
(B) If there are entrained water droplet conduct the performance test according to the site-specific test plan submitted according to § 63.1207(e)(1)(i) . Any performance test, from a site with enclosed water droplets, which measures HCN concentrations, must be submitted for the Administrator's approval prior to testing according to § 63.7(f).
(8) Particulate matter. You must use EPA Method 5 or 5I of appendix A-3 to part 60 of this chapter to demonstrate compliance with the emission standard for particulate matter.
(9) DRE. The test method selected by the facility for volatile and/or semivolatile organic compounds must be approved in the comprehensive performance test plan.
(10) Feedstream analytical methods. You may use any reliable analytical method to determine feedstream concentrations of metals, chlorine, fluorine, and other constituents. It is your responsibility to ensure that the sampling and analysis procedures are unbiased, precise, and that the results are representative of the feedstream.
(11) Opacity. If you determine compliance with the opacity standard under the monitoring requirements of § 63.1209(a)(1)(iv) and (v), you must use EPA Method 9 of appendix A-4 to part 60 of this chapter.
[91 FR 33539, June 3, 2026]