[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: 40CFR413.51] [Page 213] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 413_ELECTROPLATING POINT SOURCE CATEGORY--Table of Contents Subpart E_Coatings Subcategory Sec. 413.51 Specialized definitions. For the purpose of this subpart; (a) The term sq m (``sq ft'') shall mean the area processed expressed in square meters (square feet). (b) The term operation shall mean any step in the coating process in which a basis material surface is acted upon by a process solution and which is followed by a rinse; plus the related operations of alkaline cleaning, acid pickle, and sealing, when each operation is followed by a rinse.