§ 421.110 Applicability: Description of the primary columbium-tantalum subcategory
§ 421.111 Specialized definitions
§ 421.112 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available
§ 421.113 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable
§ 421.114 Standards of performance for new sources
§ 421.115 Pretreatment standards for existing sources
§ 421.116 Pretreatment standards for new sources