CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 430—THE PULP, PAPER, AND PAPERBOARD POINT SOURCE CATEGORY > SUBPART E—Papergrade Sulfite Subcategory (§430.50 to §430.58) > 430.58—Best management practices (BMPs).