[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: 40CFR429.50] [Page 90] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 429_TIMBER PRODUCTS PROCESSING POINT SOURCE CATEGORY --Table of Contents Subpart D_Dry Process Hardboard Subcategory Sec. 429.50 Applicability; description of the dry process hardboard subcategory. This subpart applies to discharges to waters of the United States and to the introduction of process wastewater pollutants into publicly owned treatment works from any plant that produces hardboard using the dry matting process for forming the board mat.