National Emission Standards for Hazardous Air Pollutants for Source Categories: Generic Maximum Achievable Control Technology Standards; and National Emission Standards for Ethylene Manufacturing Process Units: Heat Exchange Systems and Waste Operations

The EPA is taking direct final action on amendments to the National Emissions Standards for Hazardous Air Pollutants for Source Categories: Generic Maximum Control Technology Standards which were promulgated in June 1999 (64 FR 34863), and the National Emission Standards for Ethylene Manufacturing Units: Heat Exchange Systems and Waste Operations which were promulgated in July 2002 (67 FR 46258). The direct final rule amendments clarify the compliance requirements for benzene waste streams, clarify the requirements for heat exchangers and heat exchanger systems, and stipulate the provisions for offsite waste transfer in the national emission standards for ethylene manufacturing process units. The direct final rule amendments also correct the regulatory language that make emissions from ethylene cracking furnaces during decoking operations an exception to the provisions and delineate overlapping requirements for storage vessels and transfer racks. In addition, the direct final rule amendments also correct errors in the proposed rule for the Acrylic and Modacrylic Fiber Production source category which were not corrected as indicated in the preamble to the June 1999 final rule (64 FR 34863). We are issuing the amendments as direct final rules, without prior proposal, because we view the revisions as noncontroversial and anticipate no adverse comments. However, in the Proposed Rules section of this Federal Register, we are publishing a separate document that will serve as the proposal to amend the National Emissions Standards for Hazardous Air Pollutants for Source Categories: Generic Maximum Control Technology Standards and the National Emission Standards for Ethylene Manufacturing Process Units: Heat Exchange Systems and Waste Operations.