{"data":{"id":"us/40-cfr-464.21","jurisdiction":"us","citation":"40 CFR 464.21","heading":"Specialized definitions.","body":"For the purpose of this subpart:\n(a) Total Toxic Organics (TTO). TTO is a regulated parameter under PSES (§ 464.25) and PSNS (§ 464.26) for the copper subcategory and is comprised of a discrete list of toxic organic pollutants for each process segment where it is regulated, as follows:\n(1) Casting Quench (§§ 464.25(a) and 464.26(a)):\n23. chloroform (trichloromethane)\n64. pentachlorophenol\n66. bis(2-ethylhexyl)phthalate\n71. dimethyl phthalate\n(2) Dust Collection Scrubbers (§ 464.25(c) and 464.26(c)):\n1. acenaphthene\n22. para-chloro meta-cresol\n23. chloroform (trichloromethane)\n34. 2,4-dimethylphenol\n55. naphthalene\n58. 4-nitrophenol\n64. pentachlorophenol\n65. phenol\n66. bis(2-ethylhexyl)phthalate\n67. butyl benzyl phthalate\n68. di-n-butyl phthalate\n70. diethyl phthalate\n71. dimethyl phthalate\n72. benzo(a)anthracene (1,2-benzanthracene)\n74. 3,4-benzofluoranthene\n75. benzo(k) fluoranthene\n76. chrysene\n77. acenaphthylene\n78. anthracene\n81. phenanthrene\n84. pyrene\n(3) Investment Casting (§ 464.25(e) and § 464.26(e)):\n1. acenaphthene\n22. para-chloro meta-cresol\n23. chloroform (trichloromethane)\n34. 2,4-dimethylphenol\n55. naphthalene\n58. 4-nitrophenol\n64. pentachlorophenol\n65. phenol\n66. bis (2-ethylhexyl)phthalate\n67. butyl benzyl phthalate\n68. di-n-butyl phthalate\n70. diethyl phthalate\n71. dimethyl phthalate\n72. benzo(a)anthracene (1,2-benzanthracene)\n74. 3,4-benzofluoranthene\n75. benzo(k) fluoranthene\n76. chrysene\n77. acenaphthylene\n78. anthracene\n81. Phenanthrene\n84. pyrene\n(4) Melting Furnace Scrubber (§ 464.25(f) and § 464.26(f)):\n1. acenaphthene\n22. para-chloro meta-cresol\n23. chloroform (trichloromethane)\n34. 2,4-dimethylphenol\n55. naphthalene\n58. 4-nitrophenol\n64. pentachlorophenol\n65. phenol\n66. bis (2-ethylhexyl) phthalate\n67. butyl benzyl phthalate\n68. di-n-butyl phthalate\n70. diethyl phthalate\n71. dimethyl phthalate\n72. benzo(a)anthracene (1,2-benzanthracene)\n74. 3,4-benzoflouranthene\n75. benzo(k) flouranthene\n76. chrysene\n77. acenaphthylene\n78. anthracene\n81. phenanthrene\n84. pyrene\n(5) Mold Cooling (§ 464.25(g) and § 464.26(g)):\n23. chloroform (trichloromethane)\n64. pentachlorophenol\n66. bis(2-ethylhexyl)phthalate\n71. dimethyl phthalate","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS","PART 464—METAL MOLDING AND CASTING POINT SOURCE CATEGORY","Subpart B—Copper Casting Subcategory"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"4bbac8692e2778b858df4fd285a42db2b6fb3ed40b2027996c38a0ea9a0da75d","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-464.20","next":"us/40-cfr-464.22"},"notice":"GroundRules: Original legal text. Not legal advice."}