For the purpose of this subpart:
(a) Total Toxic Organics (TTO). TTO is a regulated parameter under PSES (Sec. 464.25) and PSNS (Sec. 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:
(1) Casting Quench (Sec. 464.25(a) and Sec. 464.26(a)): 23. chloroform (trichloromethane)64. pentachlorophenol66. bis(2-ethylhexyl)phthalate71. dimethyl phthalate
(2) Dust Collection Scrubbers (Sec. 464.25(c) and 464.26(c)): 1. acenaphthene22. para-chloro meta-cresol23. chloroform (trichloromethane)34. 2,4-dimethylphenol55. naphthalene58. 4-nitrophenol64. pentachlorophenol65. phenol66. bis(2-ethylhexyl)phthalate67. butyl benzyl phthalate68. di-n-butyl phthalate70. diethyl phthalate71. dimethyl phthalate72. benzo(a)anthracene (1,2-benzanthracene)74. 3,4-benzofluoranthene75. benzo(k) fluoranthene76. chrysene77. acenaphthylene78. anthracene81. phenanthrene84. pyrene
(3) Investment Casting (Sec. 464.25(e) and Sec. 464.26(e)): 1. acenaphthene22. para-chloro meta-cresol23. chloroform (trichloromethane)34. 2,4-dimethylphenol55. naphthalene58. 4-nitrophenol64. pentachlorophenol65. phenol66. bis (2-ethylhexyl)phthalate67. butyl benzyl phthalate68. di-n-butyl phthalate70. diethyl phthalate71. dimethyl phthalate72. benzo(a)anthracene (1,2-benzanthracene)74. 3,4-benzofluoranthene75. benzo(k) fluoranthene76. chrysene77. acenaphthylene78. anthracene 81. Phenanthrene84. pyrene
(4) Melting Furnace Scrubber (Sec. 464.25(f) and Sec. 464.26(f)): 1. acenaphthene22. para-chloro meta-cresol23. chloroform (trichloromethane)34. 2,4-dimethylphenol55. naphthalene58. 4-nitrophenol64. pentachlorophenol65. phenol66. bis (2-ethylhexyl) phthalate67. butyl benzyl phthalate68. di-n-butyl phthalate70. diethyl phthalate71. dimethyl phthalate72. benzo(a)anthracene (1,2-benzanthracene)74. 3,4-benzoflouranthene75. benzo(k) flouranthene76. chrysene77. acenaphthylene78. anthracene81. phenanthrene84. pyrene
(5) Mold Cooling (Sec. 464.25(g) and Sec. 464.26(g)): 23. chloroform (trichloromethane)64. pentachlorophenol66. bis(2-ethylhexyl)phthalate71. dimethyl phthalate