SUBPART B—Primary Aluminum Smelting Subcategory (§421.20 to §421.27)
- 421.20—Applicability: description of the primary aluminum smelting subcategory.
- 421.21—Specialized definitions.
- 421.22—Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
- 421.23—Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
- 421.24—Standards of performance for new sources.
- 421.26—Pretreatment standards for new sources.