[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: 40CFR413.81] [Page 218] TITLE 40-PROTECTION OF ENVIRONMENT CHAPTER I-ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 413-ELECTROPLATING POINT SOURCE CATEGORY--Table of Contents Subpart H-Printed Circuit Board Subcategory Sec. 413.81 Specialized definitions. For the purpose of this subpart: (a) The term sq ft (``sq m'') shall mean the area of the printed circuit board immersed in an aqueous process bath. (b) The term operation shall mean any step in the printed circuit board manufacturing process in which the board is immersed in an aqueous process bath which is followed by a rinse.