This action will amend an existing rule that revised National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Hard and Decorative Chromium Electroplating and Chromium Anodizing Tanks source category. That existing rule was published on September 19, 2012 (77 FR 58219). This action will add provisions back into the rule that were inadvertently deleted when the EPA published the 2012 final rule. These provisions, which were in the original 1995 NESHAP, provide facilities the opportunity to increase the duration of time between surface tension measurements after a certain number of compliant measurements. The EPA never intended these provisions to be deleted. In addition, this action will correct several typographical errors, incorrect references, and other minor inadvertent errors that the EPA discovered after promulgation of the 2012 final amendments.