[Code of Federal Regulations] [Title 40, Volume 26] [Revised as of July 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR424.50] [Page 669] TITLE 40-PROTECTION OF ENVIRONMENT CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 424-FERROALLOY MANUFACTURING POINT SOURCE CATEGORY--Table of Contents Subpart E-Other Calcium Carbide Furnaces Subcategory Sec. 424.50 Applicability; description of the other calcium carbide furnaces subcategory. Source: 40 FR 8035, Feb. 24, 1975, unless otherwise noted. The provisions of this subpart are applicable to discharges resulting from the production of calcium carbide in those covered furnaces which do not utilize wet air pollution control methods. Covered calcium carbide furnaces using wet air pollution control devices are regulated in subpart D of this part. Open (uncovered) calcium carbide furnaces are regulated in part 415, inorganic chemicals manufacturing point source category (39 FR 9612).