This action promulgates the consolidated rulemaking proposal published on October 14, 1998. Today's rule establishes our ``generic MACT standards'' program for setting national emission standards for hazardous air pollutants (NESHAP) under section 112 of the Clean Air Act (Act) for certain small source categories consisting of five or fewer major sources. As part of this generic MACT program, we are establishing an alternative methodology for making maximum achievable control technology (MACT) determinations for appropriate small categories by referring to previous MACT standards that have been promulgated for similar sources in other categories. The basic purposes of the generic MACT program are to use public and private sector resources efficiently, and to promote regulatory consistency and predictability in MACT standards development. Today's consolidated rulemaking package includes promulgated MACT standards that have been developed within the generic MACT framework for four specific source categories that are included on our list of categories for which NESHAP are required: acetal resins (AR) production, acrylic and modacrylic fiber (AMF) production, hydrogen fluoride (HF) production, and polycarbonate(s) (PC) production. In this consolidated rulemaking package, we are also promulgating general control requirements for certain types of emission points for hazardous air pollutants (HAP), which will then be referenced, as appropriate, in MACT requirements for individual source categories. These general control requirements are set forth in new promulgated subparts and are applicable to storage vessels containing organic materials, process vents emitting organic vapors, and leaks from equipment components. In addition, we are promulgating a separate subpart of requirements for closed vent systems, control devices, recovery devices and routing emissions to fuel gas systems or a process. We have withdrawn the proposed process wastewater provisions from the promulgat