CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart D CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart D – Industrial Sand Subcategory Current as of: 2024 | Check for updates | Other versions § 436.40 Applicability; description of the industrial sand subcategory § 436.41 Specialized definitions § 436.42 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available