Terms used in this subpart are defined in the Clean Air Act; 40 CFR 61.02 of this chapter, the NESHAP General Provisions; 40 CFR 61.61 of this chapter, the Vinyl Chloride NESHAP; and, Sec. 63.2, in regard to terms used in Secs. 63.1 and 63.5. Subpart K [Reserved]