Subpart I. Subpart I—Metallurgical Acid Plants Subcategory

• § 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.
• § 421.97 - [Reserved]