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EPA/OAR RIN: 2060-AT09 Publication ID: Fall 2019 
Title: Revision to Method 23--Determination of Polychlorinated Dibenzo-P-Dioxins and Polychlorinated Dibenzofurans From Stationary Sources 

This action will revise 40 CFR part 60, appendix A, Method 23, "Determination of Polychlorinated Dibenzo-P-Dioxins and Polychlorinated Dibenzofurans from Stationary Sources," which was last revised on March 31, 1995 (60 FR 28378). This update to Method 23 is a complete republication of the method to determine polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), which will now include an option to determine polycyclic aromatic hydrocarbons (PAHs), and/or polychlorinated biphenyls (PCBs). This update would revise the analytical procedure to include isotope dilution mass spectrometry combined with high resolution gas chromatography, which is consistent with industry practice. The update will move the method from a prescriptive to a performance-based methodology and remove requirements in the method to use outdated standards or materials. This will provide industry an appropriate method in the execution of Method 23, which has shown wide variation in its implementation, and will allow many performance-based options and procedures.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
EO 13771 Designation: Deregulatory 
CFR Citation: 40 CFR 60   
Legal Authority: 42 U.S.C. 7401 et seq., Clean Air Act   
Legal Deadline:  None
Action Date FR Cite
NPRM  11/00/2019 
Final Rule  To Be Determined 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
RIN Data Printed in the FR: No 
Agency Contact:
Ned Shappley
Environmental Protection Agency
Office of Air and Radiation
109 T.W. Alexander Drive, Mail Code E143-02,
Research Triangle Park, NC 27709
Phone:919 541-7903