SUBPART I—Metallurgical Acid Plants Subcategory (§421.90 to §421.97)
- 421.90—Applicability: Description of the metallurgical acid plants subcategory.
- 421.91—Specialized definitions.
- 421.92—Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available.
- 421.93—Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable.
- 421.94—Standards of performance for new sources.
- 421.95—Pretreatment standards for existing sources.
- 421.96—Pretreatment standards for new sources.