[Code of Federal Regulations] [Title 40, Volume 28] [Revised as of July 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR421.70] [Page 481] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 421_NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY--Table of Contents Subpart G_Primary Lead Subcategory Sec. 421.70 Applicability: Description of the primary lead subcategory. Source: 49 FR 8803, Mar. 8, 1984, unless otherwise noted. The provisions of this subpart are applicable to discharges resulting from the production of lead at primary lead smelters and refineries.