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This action will address the EPA's technology review of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Chemical Manufacturing Area Sources (CMAS). The CMAS NESHAP, 40 CFR part 63, subpart VVVVVV, was promulgated on October 29, 2009 (74 FR 56008), pursuant to Clean Air Act (CAA) section 112(d) and established emission limitations and work practice requirements for controlling emissions of hazardous air pollutants (HAP). The NESHAP controls HAP emissions from process vents, storage tanks, equipment leaks, wastewater streams, transfer operations, and heat exchange systems. This action addresses the technology review requirements of CAA section 112(d)(6) which require the EPA to review and revise the standards as necessary, taking into account developments in practices, processes and control technologies, no less often than every eight years.