CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart W CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart W – Magnesite Subcategory Current as of: 2024 | Check for updates | Other versions § 436.230 Applicability; description of the magnesite subcategory § 436.231 Specialized definitions § 436.232 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available