CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 415—INORGANIC CHEMICALS MANUFACTURING POINT SOURCE CATEGORY > SUBPART AB—Boric Acid Production Subcategory (§415.280 to §415.282) > 415.281—Specialized definitions.