The EPA took final action on a "Revisions to Test Methods and Testing Regulations" package and the changes became effective on February 27, 2014.  These changes were proposed on January 9, 2012, and updated after public comment.  Changes were made to numerous test methods, and to CEMS Performance Specifications and Procedures, as well as to a number of Part 60 and 63 regulations as they pertain to testing.  Testers are responsible for incorporating these changes as applicable.

The Summary of the action as posted in the Federal Register states, "This action promulgates technical and editorial corrections for source testing of emissions and operations. Some current testing provisions contain inaccuracies and outdated procedures, and new alternatives that have been approved are being added.  These revisions will improve the quality of data and will give testers additional flexibility to use the newly approved alternative procedures."  The Federal Register Notice can be found at the link below:

http://www.regulations.gov/#!documentDetail;D=EPA-HQ-OAR-2010-0114-0046