[Code of Federal Regulations]
[Title 40, Volume 27]
[Revised as ofJuly 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR464.31]

[Page 572-574]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 464--METAL MOLDING AND CASTING POINT SOURCE CATEGORY--Table of Contents
 
                 Subpart C--Ferrous Casting Subcategory
 
Sec. 464.31  Specialized definitions.

    For the purpose of this subpart:
    (a) Total Toxic Organics (TTO). TTO is a regulated parameter under 
PSES (Sec. 464.35) and PSNS (Sec. 464.36) for the ferrous subcategory 
and is comprised of a discrete list of toxic organic pollutants for each 
process segment where it is regulated, as follows:

[[Page 573]]

    (1) Casting Quench (Sec. 464.35(b) and Sec. 464.36(b)):

23. chloroform (trichloromethane)
34. 2,4-dimethylphenol

    (2) Dust Collection Scrubber (Sec. 464.35(c) and Sec. 464.36(b)):

1. acenaphthene
23. chloroform (trichloromethane)
31. 2,4-dichlorophenol
34. 2,4-dimethylphenol
39. fluoranthene
44. methylene chloride (dichloromethane)
55. naphthalene
64. pentachlorophenol
65. phenol
66. bis(2-ethylhexyl)phthalate
67. butyl benzyl phthalate
68. di-n-butyl phthalate
70. diethyl phthalate
71. dimethyl phthalate
72. benzo (a)anthracene (1,2-benzanthracene)
76. chrysene
77. acenaphthylene
78. anthracene
80. fluorene
81. phenanthrene
84. pyrene

    (3) Investment Casting (Sec. 464.35(e) and Sec. 464.36(e)):

23. chloroform (trichloromethane)
44. methylene chloride (dichloromethane)
66. bis (2-ethylhexyl) phthalate
77. acenaphthylene
84. pyrene

    (4) Melting Furnace Scrubber (Sec. 464.35(f) and Sec. 464.36(f)):

23. chloroform (trichloromethane)
31. 2,4-dichlorophenol
34. 2,4-dimethylphenol
39. fluoranthene
44. methylene chloride (dichloromethane)
55. naphthalene
65. phenol
66. bis (2-ethylhexyl) phthalate
67. butyl benzyl phthalate
68. di-n-butyl phthalate
72. benzo (a)anthracene (1,2-benzanthracene)
76. chrysene
77. acenaphthylene
78. anthracene
80. fluorene
81. phenanthrene
84. pyrene

    (5) Mold Cooling (Sec. 464.35(g) and Sec. 464.36(g)):

23. chloroform (trichloromethane)
34. 2,4-dimethylphenol

    (6) Slag Quench (Sec. 464.35(h) and Sec. 464.36(h)):

34. 2,4-dimethylphenol
71. dimethyl phthalate
    (7) Wet Sand Reclamation (Sec. 464.35(i) and Sec. 464.36(i)):

1. acenaphthene
34. 2,4-dimethylphenol
39. fluoranthene
44. methylene chloride (dichloromethane)
55. naphthalene
65. phenol
66. bis (2-ethylhexyl) phthalate
68. di-n-butyl phthalate
70. diethyl phthalate
71. dimethyl phthalate
72. benzo(a)anthracene (1,2-benzanthracene)
77. acenaphthylene
84. pyrene

    (b) Cast Iron. An iron containing carbon in excess of the solubility 
in the austentite that exists in the alloy at the eutectic temperature. 
Cast iron also is defined here to include any iron-carbon alloys 
containing 1.2 percent or more carbon by weight.
    (c) Ductile Iron. A cast iron that has been treated while molten 
with a master alloy containing an element such as magnesium or cerium to 
induce the formation of free graphite as nodules or spherules, which 
imparts a measurable degree of ductility to the cast metal.
    (d) Gray Iron. A cast iron that gives a gray fracture due to the 
presence of flake graphite.
    (e) Malleable Iron. A cast iron made by a prolonged anneal of white 
cast iron in which decarburization or graphitization, or both, take 
place to eliminate some or all of the cementite. Graphite is present in 
the form of temper carbon.
    (f) Steel. An iron-base alloy containing carbon, manganese, and 
often other alloying elements. Steel is defined here to include only 
those iron-carbon alloys containing less than 1.2 percent carbon by 
weight.
    (g) The ``primary metal cast'' shall mean the metal that is poured 
in the greatest quantity at an individual plant.
    (h) Multiple Ferrous Melting Furnace Scrubber Configuration. A 
multiple ferrous melting furnace scrubber configuration is a 
configuration where two or more discrete wet scrubbing devices are 
employed in series in a single melting furnace exhaust gas stream. The 
ferrous melting furnace scrubber mass allowance shall be given to each 
discrete wet scrubbing device that has an

[[Page 574]]

associated wastewater discharge in a multiple ferrous melting furnace 
scrubber configuration. The mass allowance for each discrete wet 
scrubber shall be identical and based on the air flow of the exhaust gas 
stream that passes through the multiple scrubber configuration.
    (i) Discrete Wet Scrubbing Device. A discrete wet scrubbing device 
is a distinct, stand-alone device that removes particulates and fumes 
from a contaminated gas stream by bringing the gas stream into contact 
with a scrubber liquor, usually water, and from which there is a 
wastewater discharge. Examples of discrete wet scrubbing devices are: 
Spray towers and chambers, venturi scrubbers (fixed and variable), wet 
caps, packed bed scrubbers, quenchers, and orifice scrubbers. Semi-wet 
scrubbing devices where water is added and totally evaporates prior to 
dry air pollution control are not considered to be discrete wet 
scrubbing devices. Ancillary scrubber operations such as fan washes and 
backwashes are not considered to be discrete wet scrubber devices. These 
ancillary operations are covered by the mass limitations of the 
associated scrubber. Aftercoolers are not considered to be discrete wet 
scrubbing devices, and water discharges from aftercooling are not 
regulated as a process wastewater in this category.