CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart C CFR > Title 40 > Chapter I > Subchapter N > Part 436 > Subpart C – Construction Sand and Gravel Subcategory Current as of: 2024 | Check for updates | Other versions § 436.30 Applicability; description of the construction sand and gravel subcategory § 436.31 Specialized definitions § 436.32 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available