§ 421.100 Applicability: Description of the primary tungsten subcategory
§ 421.101 Specialized definitions
§ 421.102 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best practicable control technology currently available
§ 421.103 Effluent limitations guidelines representing the degree of effluent reduction attainable by the application of the best available technology economically achievable
§ 421.104 Standards of performance for new sources
§ 421.105 Pretreatment standards for existing sources
§ 421.106 Pretreatment standards for new sources