[Code of Federal Regulations] [Title 40, Volume 27] [Revised as ofJuly 1, 2003] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR429.50] [Page 91] 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.