[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: 40CFR406.21] [Page 83] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 406_GRAIN MILLS POINT SOURCE CATEGORY--Table of Contents Subpart B_Corn Dry Milling Subcategory Sec. 406.21 Specialized definitions. For the purpose of this subpart: (a) Except as provided below, the general definitions, abbreviations and methods of analysis set forth in part 401 of this chapter shall apply to this subpart. (b) The term corn shall mean the shelled corn delivered to a plant before processing. (c) The term standard bushel shall mean a bushel of shelled corn weighing 56 pounds. (d) The abbreviation MSBu shall mean 1000 standard bushels.