[Code of Federal Regulations] [Title 40, Volume 29] [Revised as of July 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR429.90] [Page 94] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 429_TIMBER PRODUCTS PROCESSING POINT SOURCE CATEGORY --Table of Contents Subpart H_Wood Preserving_Boulton Subcategory Sec. 429.90 Applicability; description of the wood preserving--Boulton subcategory. This subpart applies to discharges to waters of the United States and to the introduction of process wastewater pollutants into a publicly owned treatment works from wood preserving operations which use the Boulton process as the predominant method of conditioning stock.