[Federal Register Volume 61, Number 108 (Tuesday, June 4, 1996)]
[Notices]
[Pages 28197-28208]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-13824]



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ENVIRONMENTAL PROTECTION AGENCY

[AD-FRL-5512-9]


National Emission Standards for Hazardous Air Pollutants; 
Revision of Initial List of Categories of Sources and Schedule for 
Standards Under Sections 112(c) and (e) of the Clean Air Act Amendments 
of 1990

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of revisions to initial list of categories of major and 
area sources, and revisions to promulgation schedule for standards.

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SUMMARY: This notice publishes revisions made or which have been 
proposed to the initial list of categories of sources of hazardous air 
pollutants (HAP), published in the Federal Register on July 16, 1992 
(57 FR 31576), and to the schedule for the promulgation of emission 
standards, which was published on December 3, 1993 (58 FR 63941) and 
subsequently corrected on March 4, 1994 (59 FR 10461).
    Today's notice meets the requirement in Section 112(c)(1) to 
publish from time to time a list of all categories of sources, 
reflecting revisions since the initial list was published. Several of 
the revisions identified in today's notice have already been published 
in actions associated with listing and promulgating emission standards 
for individual source categories, and public comment has already been 
taken in the context of those actions. Some of the revisions in today's 
notice have not been reflected in any previous notices, and are being 
taken without public comment on the Administrator's own motion. Such 
revisions are deemed by EPA to be without need for public comment, 
based on the nature of the actions. Other revisions have been only 
proposed as of today's date, but are reflected nevertheless to be 
inclusive of all list and schedule actions of probable interest to the 
reader.

EFFECTIVE DATE: June 4, 1996.

ADDRESSES: Relevant information can be found in the two Federal 
Register notices cited above in the SUMMARY section of this notice.
    Docket: Docket No. A-90-49, containing supporting information used 
in development of this notice, is available for public inspection and 
copying between 8 a.m. and 5:30 p.m., Monday through Friday, at the 
EPA's Air and Radiation Docket and Information Center, Waterside Mall, 
room M-1500, first floor, 401 M Street, SW, Washington, D. C. 20460, or 
by calling (202) 260-7548 or 260-7549. A reasonable fee may be charged 
for copying.

FOR FURTHER INFORMATION CONTACT: For information concerning this 
notice, contact Mr. David Svendsgaard, Emissions Standards Division 
(MD-13), U.S. EPA, Office of Air Quality Planning and Standards, 
Research Triangle Park, North Carolina 27711, telephone number (919) 
541-2380.

SUPPLEMENTARY INFORMATION

I. Background

    The Clean Air Act Amendments of 1990 [Pub. L. 101-549] require, 
under the revisions to Section 112, that the Agency list and promulgate 
national emission standards for hazardous air pollutants (NESHAP) in 
order to control, reduce, or otherwise limit the emissions of HAP from 
categories of major and area sources. Pursuant to the various specific 
listing requirements in Section 112(c), the Agency published on July 
16, 1992 (57 FR 31576) an initial list of 174 categories of major and 
area sources that would be henceforth subject to emission standards. 
Following this listing, pursuant to requirements in Section 112(e), on 
December 3, 1993 (58 FR 63941) the Agency published a schedule for the 
promulgation of emission standards for each of the 174 listed source 
categories. The reader is directed to these two notices for information 
relating to development of the initial list and schedule.
    There have been specific notices since the initial list and 
schedule that have revised the list and schedule in the context of 
actions relating to individual source categories. For example, on 
November 12, 1993 (58 FR 60021), the Agency listed marine vessel 
loading operations as a category of major sources, with standards to be 
promulgated, pursuant to Section 112(c)(5), by the year 2000. As 
another example, on September 8, 1994 (59 FR 46339), the Agency 
promulgated standards for HAP emissions for industrial process cooling 
towers. This latter action did not revise the list or schedule, per se, 
but specifically delineated rule applicability by defining the affected 
sources within the listed category. The Agency believes that defining 
rule applicability and affected sources as part of standard setting 
constitutes an important aspect of list revision. As was stated in the 
original listing notice (57 FR 31576):

the Agency recognizes that these descriptions [in the initial list], 
like the list itself, may be revised from time to time as better 
information becomes available. The Agency intends to revise these 
descriptions as part of the process of establishing standards for 
each category. Ultimately, a definition of each listed category, or 
subsequently listed subcategories, will be incorporated in each rule 
establishing a NESHAP for a category.

    Various other Agency actions may trigger the need for list and/or 
schedule revisions. Included actions are:

--The Administrator is obligated to list any category of major sources. 
Today's notice is listing seven

[[Page 28198]]

categories of major sources for which it did not have prior evidence 
that at least one major source was present within the category. Two of 
the seven additions were effected through previous Federal Register 
notices, and are thereby reflected in today's notice. When a category 
is added to the list after the initial listing, pursuant to Sections 
112(c)(1) and (3), emission standards must be scheduled by November 15, 
2000, or within 2 years after the date of listing, whichever is later, 
to meet the requirements of Section 112(c)(5).
--The Agency may list categories of area sources pursuant to a number 
of authorities in Section 112. One area source category-- secondary 
lead smelting--has been added to the list since the initial listing 
notice as part of a final regulatory action, and is reflected in 
today's list.
--The Administrator may delete categories of sources on its own motion 
or on petition. Five source categories which were previously believed 
to be major source categories are being deleted from the list on the 
Administrator's own motion in today's notice. This notice refers to one 
area source category that has been deleted from the list under a 
separate action. None of these deletions is as a result of petition.
--The Agency may revise the list to delineate the applicability of 
``case-by-case'' emission standards pursuant to Section 112(j), in 
instances where the Agency desires to delimit the affected sources 
because it may not establish a Federal emission standard by the 
deadline in the regulatory schedule for standards. No such revision is 
made or reflected in today's notice.
--The Agency may revise the regulatory schedule for standards 
associated with a listed source category, heeding the limitations in 
Section 112 (discussed in 58 FR 63941). For example, the regulatory 
schedule for one source category--dodecanedioic acid production--is, in 
effect, moved forward in time, from the year 2000 to 1992, following 
the determination to incorporate this category within the definition of 
the synthetic organic chemical manufacturing source category (see 59 FR 
19402). Today's notice specifies two such actions involving subsumption 
of previously listed source categories, or segments of source 
categories, within another category, and the corresponding change in 
regulatory schedules. In each case, however, the action is not being 
effected by today's notice, but rather has been effected (or proposed) 
within other notices for which public comment has been (or is being) 
taken.
--Other ``housekeeping'' measures. After investigation by the Agency, 
it has been determined that the titles or descriptions of some 
categories of sources can be amended to clarify applicability for the 
ensuing emission standard, and other categories can be included under a 
different, more appropriate industry group. In today's notice, two 
categories of sources are renamed, three categories are reassigned to 
different industry groups, and no categories are redefined (although in 
most instances, descriptions of source categories have been refined 
upon determining applicability at promulgation of the rule).
    Section 112(e)(4) states that, notwithstanding Section 307 of the 
Act, no action of the Administrator listing a source category or 
subcategory under Section 112(c) shall be a final Agency action subject 
to judicial review, except that any such action may be reviewed under 
Section 307 when the Administrator issues emission standards for such 
pollutant or category. Therefore, today's list is not a final Agency 
action and is not subject to judicial review.
    Prior to issuance of the initial source category list under Section 
112(c)(1), the EPA published a draft initial list for public comment 
(56 FR 28548; June 21, 1991). Although EPA was not required to take 
public comment on the initial source category list, it believed it was 
useful to solicit input on a number of issues related to the list. 
Indeed, in most instances, even where there is no statutory requirement 
to take comment, EPA solicits public comment on actions it is 
contemplating. The EPA has, however, decided that it is unnecessary to 
solicit additional public comment on the revisions reflected in today's 
notice because interested parties have already had, or will have in the 
future, the opportunity to provide comments on many of the revisions in 
the context of individual actions relating to proposing and 
promulgating emissions standards.

II. Description of Individual List and Schedule Revisions

    The revised source category list and regulatory schedule, 
reflecting all actions (with the exception of proposed actions) up to 
today's date, is presented in Table 1. This table incorporates the 
entire listing of source categories listed to this date, including 
those listed initially as well as those listed subsequently. Table 1 
also includes the updated schedule for establishing emission standards 
under Section 112 for the listed categories, including actual rule 
proposal or promulgation Federal Register citations. Table 1 is 
formatted so that the reader can at once see all categories of major 
and area sources that have been listed to date, the associated schedule 
for standards, and any revisions effected by or reflected in today's 
notice. Source categories and/or schedules for standards in Table 1 
that are revised from the initial July 16, 1992 listing and December 3, 
1993 schedule notices are footnoted or clearly marked for ease in 
discerning where revisions have been made.

A. Addition of Categories of Major Sources

    In response to new information, today's notice reflects the listing 
of the following categories of major sources: Carbon Black Production, 
Ethylene Processes, Flexible Polyurethane Foam Fabrication Operations, 
Friction Products Manufacturing, Leather Tanning and Finishing 
Operations, Marine Vessel Loading Operations, and Nitrile Resins 
Production. Pursuant to Section 112(c)(5), each of the newly listed 
categories of sources is scheduled for standards promulgation by 
November 15, 2000. Descriptions of these source categories can be found 
in Section II.I of today's notice. The reader is referred to Docket No. 
A-90-49, Section VI-B, for more information supporting the listing of 
the above seven source categories.

B. Addition of Categories of Area Sources

    The various authorities to list and regulate area source categories 
under Section 112 are all discretionary and/or require some sort of 
finding or determination by the Administrator. The Agency believes that 
any such area source listing action is therefore subject to public 
comment and is consequently not being taken in today's notice. Instead, 
todays notice merely reflects any such findings or determinations.
    Today's notice reflects a June 23, 1995 notice (60 FR 32587) 
finalizing the addition of secondary lead smelters as an area source 
category. Accompanying this notice is a finding of threat of adverse 
effects based on seven smelters that the Agency believes fit the 
definition of an area source.

C. Delineation of Standard Applicability and Affected Sources Through 
Standard Promulgation

    Emission standards have been promulgated under Section 112 for 
several source categories since the initial source category list and 
schedule were published. Table 1 identifies the

[[Page 28199]]

Federal Register cite for each of these notices. These actions are 
cited in today's notice because they revise the list in that they 
delineate rule applicability by defining the affected sources within 
the listed category.

D. Proposed Delineation of Standard Applicability and Affected Sources 
Through Standard Proposal

    Emission standards have been proposed under Section 112 for several 
source categories since the initial source category list and schedule 
were published. These actions are cited in today's notice principally 
insofar as they propose to revise the list in that they will delineate 
rule applicability by defining the affected sources within the listed 
category. The reader is referred to Table 1 to obtain the Federal 
Register citations for these categories of sources.

E. Name Changes for Listed Source Categories

    The Agency has determined that the names of some source categories 
are inappropriate, and is hereby changing them. The applicable 
categories are:
1. Solid Waste Treatment, Storage and Disposal Facilities (TSDF)
    On October 13, 1994 (59 FR 51913), the Agency proposed emission 
standards for the Solid Waste TSDF source category and changed its 
title to ``Off-Site Waste and Recovery Operations.'' As discussed in 
that notice, this change was considered appropriate for two reasons. 
First, it will help avoid confusion with the terms ``solid waste'' and 
``treatment, storage, and disposal facilities.'' These terms have 
specific meanings within the context of statutory and regulatory 
requirements in existing rules established under authority of the 
Resource Conservation and Recovery Act (RCRA), and this source category 
would not include those facilities defined as solid waste treatment, 
storage, and disposal facilities by the RCRA. Second, the name change 
will better distinguish among the types of sources that will be subject 
to the emission standard for this source category, rather than another 
listed source category. Facilities within other source categories may 
generate waste as a result of their own production activities, and may 
elect to treat, store, dispose of, or recycle this waste on the same 
site. Emissions from these waste operations will be addressed along 
with the other emission points within the specific source category. 
This source category specifically addresses only activities that manage 
wastes received from off-site operations.
2. Butadiene Dimers Production
    This major source category, under the ``miscellaneous processes'' 
grouping on the initial list, is being changed in name to 
``tetrahydrobenzaldehyde production,'' under the same industrial 
process grouping. The Agency has determined, based on comments, that 
the butadiene dimer is produced by only one facility in the nation, as 
a waste product from the tetrahydrobenzaldehyde process. The specific 
dimer is 1,4-vinyl cyclohexane. Tetrahydrobenzaldehyde is the only 
identified chemical under the butadiene dimers source category in the 
initial list; therefore, changing the name of the source category will 
not change the applicability of the subsequent emission standard or the 
affected sources. This change will merely identify the correct chemical 
the Agency intended to regulate pursuant to the initial list.

F. Inclusion of Listed Source Categories Under Different Industry 
Groups

    The Agency has determined that three source categories were 
previously categorized under inappropriate industry groups and is 
hereby moving these categories to more appropriate industrial groups 
for purposes of correctness. In each case, the movement of the source 
category will have no effect on the development or the promulgation 
date of the NESHAP.
1. Butadiene Furfural Cotrimer (R-11) Production
    This category was improperly listed in the initial list under the 
``polymer and resins'' industry group. Butadiene furfural cotrimer is 
an insecticide that is commonly used as a delousing agent for cows. It 
is therefore appropriate to move this source category to the 
``agricultural chemicals'' industry group.
2. Polyether Polyols Production
    This category was improperly listed in the initial list under the 
``miscellaneous'' industry group. Polyether polyols are defined as 
addition polymers of cyclic ethers, which include a variety of end use 
products ranging from low molecular weight polyglycols to high 
molecular weight resins. It is therefore appropriate to move this 
source category to the ``polymers and resins production'' industry 
group.
3. Quaternary Ammonium Compounds Production
    This category is more appropriately listed under the heading 
``organic chemicals production,'' rather than the ``inorganic chemicals 
production'' industry group. This compound is clearly an organic 
chemical; thus, the previous determination to include this as an 
inorganic chemical production was an error.

G. Subsumption of Listed Source Categories (or some affected sources 
within) Under Other Listed Source Categories

1. The Synthetic Organic Chemical Manufacturing Source Category and 
Dodecanedioic Acid Production
    The source category ``Dodecanedioic Acid Production'' is being 
removed from the list of major source categories because the production 
of this chemical is being regulated under the Hazardous Organic NESHAP 
(HON) (59 FR 19402; April 22, 1994). Based on public comment, the 
Agency determined that dodecanedioic acid (DDDA) production is more 
appropriately regulated as part of the synthetic organic chemical 
manufacturing source category rather than as part of a separate source 
category. Only one facility in the United States has been identified as 
manufacturing DDDA, and much of the equipment used in the DDDA 
production process is the same equipment used to manufacture 
adiponitrile, which is included in the list of Synthetic Organic 
Chemical Manufacturing Industry (SOCMI) chemicals regulated by the HON. 
Thus, this chemical has been offically added to the list of SOCMI 
chemicals subject to the HON.
2. Phthalate Plasticizers Production and the Synthetic Organic Chemical 
Manufacturing Source Category
    In the finalized HON, the EPA re-evaluated several chemicals, 
including phthalate esters, which some commenters had claimed were not 
SOCMI chemicals. The EPA agreed that phthalate esters were chemicals 
used primarily as plasticizers, not as building blocks for other 
chemical manufacturing. Thus, phthalate esters were removed from the 
list of SOCMI chemicals covered under the HON. The Agency intends to 
regulate the production of these esters under the separate source 
category entitled ``phthalate plasticizers production,'' under the 
miscellaneous processes industry group. The affected chemicals are 
butyl benzyl phthalate, diallyl phthalate, dibutoxy ethyl phthalate, 
diethyl phthalate, diisodecyl phthalate, diisooctyl phthalate, dimethyl 
phthalate, di(2-methoxyethyl) phthalate, and lead phthalate.

[[Page 28200]]

H. Deletion of Source Categories on the Administrator's Own Motion

    In today's notice, the EPA is deleting five major source categories 
on the Administrator's own motion. The principal rationale for deletion 
of these categories is that available data no longer support the 
determination that any major sources are present in each category. As 
articulated in the initial list notice (57 FR 31576), the Agency's 
intent in listing categories of major sources is one of ``only 
including categories of major sources where there was reasonable 
certainty that at least one stationary source in the category is a 
major source or where sources in the category are commonly located on 
the premises of major sources.'' In addition, one area source 
category--asbestos processing--has been delisted under a separate 
action; the Agency compiled newer information which no longer supported 
the finding of threat of adverse effect on which the initial listing 
was based.
    The Agency is not invoking the authority within Section 112(c)(9) 
for deleting source categories. Under Section 112(c)(9)(B), the EPA may 
delete a category of major or area sources from the list, based on 
petition of any person or on the Administrator's own motion, upon a 
determination that: (1) In the case of sources that emit HAP that may 
result in cancer, no source in the category (or group of sources in the 
case of area sources) emits HAP in quantities that may cause lifetime 
cancer risk greater than one chance in one million to the most exposed 
individual; or, (2) in the case of sources that emit HAP that may 
result in non-cancer adverse health effects or adverse environmental 
effects, emissions from no source in the category (or group of sources 
in the case of area sources) exceed a level adequate to protect public 
health with an ample margin of safety and no adverse environmental 
effects will result. Instead, in today's notice, the Agency is simply 
contending that the data originally used for listing were erroneous, 
and that, based on newer data, the original listings are not warranted.
    For the five major source categories deleted in today's notice, no 
action is taken to list area sources within the same category. Any such 
action would be taken (and comment requested) within the context of 
other actions pursuant to the various authorities under Section 112 for 
listing area source categories. The Agency has various authorities for 
listing and regulating area source categories under Section 112, most 
notably: it can make a finding of threat of adverse effect to human 
health or the environment warranting regulation, under Section 
112(c)(3); it can list categories of area sources emitting the seven 
specific pollutants, under Section 112(c)(6); or it can list categories 
of area sources emitting certain hazardous air pollutants per the 
criteria of the area source program, under Section 112(k). The Agency 
will examine area sources in the context of programs underway to 
implement these various authorities, and list and regulate specific 
area sources, as appropriate to meet the relevant requirements in the 
Act. The Agency intends to solicit comment on any future action or 
strategy specifically proposing to list and regulate particular area 
source categories under Section 112.
    The following does not include the categories of sources which are 
being deleted from the list by way of subsumption into other listed 
categories. See Section II.G of this notice for information on these 
categories.
1. Asbestos Processing
    The area source category of asbestos processing was included on the 
initial list, accompanied by a finding of threat of adverse effects to 
human health. The reader is referred to the original list notice (57 FR 
31576) for details of this finding.
    During development of the NESHAP for asbestos processing, the 
Agency determined that the finding of adverse effects was based on 
information which no longer applies to the asbestos processing 
industry. Consequently, the asbestos processing source category has 
been deleted from the source category list. For further information 
regarding this delisting, the reader is referred to 60 FR 61550, which 
was published on November 30, 1995.
2. Chromium Chemicals Manufacturing
    The EPA is removing chromium chemicals manufacturing from the list 
of categories of major sources. The EPA has determined that this 
category contains no major sources.
    There are only two chromium chemicals manufacturing facilities in 
the United States. Chromium compounds is the only HAP emitted from 
these facilities. Worst case estimates of potential emissions on a 
chromium compound basis, considering both hexavalent and trivalent 
forms, were compiled for each facility based on maximum production 
capacity and actual measured emissions from all stacks and vents. The 
resultant estimate of potential HAP emissions for each facility is 
between 6.0 and 6.5 tons per year (tpy), which is clearly below the 
major source threshold level.
    Considering the carcinogenic potency of the chromium compounds 
emitted, especially those in the hexavalent form, a quantitative risk 
assessment was conducted by EPA to determine if regulation of area 
sources would be warranted. In making the area source finding, the 
Agency considered factors such as the number of sources in the 
category, the quantity of HAP emissions from individual sources and 
category-wide, the toxicity of the HAP emissions, and the potential for 
individual and population exposures and risks. Population risks are 
expressed in terms of annual incidence which is the total number of 
cancer cases expected per year within the exposed population. In 
contrast, individual risks are expressed in terms of maximum individual 
``lifetime'' risks (MIR) which is an indicator of the probability of 
contracting cancer due to continuous exposure over a lifetime to the 
maximum, modeled, long-term concentration of a HAP discharged from a 
source.
    Results of the quantitative risk assessment shows annual incidence 
attributable to both plants to be less than 0.01 case per year. The 
calculated MIR for both plants ranged from 3 to 7 chances in 100,000. 
About 200,000 persons are exposed to individual risks greater than 1 in 
1 million. No persons are exposed to individual risks greater than 1 in 
10,000.
    Based on the results of the quantitative risk assessment and the 
fact that there exists limited opportunities for additional HAP 
reductions, due to the relatively high levels of control already 
evident at each source, the EPA believes that an area source finding 
for the chromium chemicals manufacturing source category is not 
warranted.
3. Lead Acid Battery Manufacturing
    The EPA is removing lead acid battery manufacturing from the list 
of major source categories. Surveys conducted on this category indicate 
there are no major sources currently operating.
    The lead acid battery manufacturing source category includes 84 
facilities. Lead compounds are the primary HAP of concern. A survey of 
existing facilities was conducted to determine annual HAP emissions. 
Respondents to the survey represent more than 90 percent of the total 
lead acid battery production. The highest lead compound emission rate 
reported by a facility was 2.8 tpy.
    In addition, all existing facilities are currently subject to the 
new source performance standards (NSPS) for lead

[[Page 28201]]

acid battery manufacturing plants. Any new facilities will also be 
subject to these standards. The limits from the NSPS were combined with 
model plant parameters to determine the emission levels from large 
facilities. This analysis indicated that a large facility would emit a 
maximum of 5 tpy of lead compounds.
    The Toxic Release Information System (TRIS) data was reviewed for 
the years 1991 and 1992 to determine emission levels of HAP other than 
lead compounds. Of the 84 plants, the TRIS identified two battery 
manufacturing plants as potential major sources of organic HAP. 
However, upon contacting these plants to obtain current process and 
emissions information, the EPA determined that the TRIS information was 
no longer applicable. Specifically, one facility had altered part of 
its process and had not been a major source since 1992, and the other 
plant had been originally misclassified in the TRIS and was not 
actually a lead acid battery manufacturer. Based on this information, 
the EPA concludes that there are no major sources in the lead acid 
battery manufacturing source category.
4. & 5. Non-Stainless Steel Manufacturing--Electric Arc Furnace (EAF) 
Operation, Stainless Steel Manufacturing--EAF Operation
    The EPA is removing the non-stainless and stainless steel electric 
arc furnace (EAF) operation categories from the list of major source 
categories. These operations are being removed since there are no 
existing facilities which qualify as a major source.
    Arsenic, antimony, beryllium, cadmium, chromium, cobalt, lead, 
manganese, mercury, nickel, and selenium are believed to be the only 
HAP emitted from the EAF source categories. None of the existing 
facilities emit any of these HAP in sufficient quantities to meet the 
major source definition. Total facility emission estimates for the EAF 
source categories were calculated by combining actual stack emission 
data with ``worst case'' fugitive emission estimates. The results of 
this analysis indicated these facilities would emit about one-half of 
the amount of HAP which would classify them as major sources. In 
addition, existing facilities are already subject to the NSPS for EAF 
operations which regulate the air pollution control device outlet 
concentration and visible emissions from the EAF meltshop. Any new 
facilities would also be subject to the NSPS.
6. Wood Treatment
    The EPA is removing the wood treatment category from the list of 
major source categories. Wood treatment is being removed because EPA 
has determined there are no existing facilities which qualify as a 
major source.
    Naphthalene, benzene, toluene, formaldehyde, pentachloro-phenol, 
arsenic compounds, and chromium compounds are the primary HAP emitted 
from wood treatment facilities that are of potential concern. None of 
the existing facilities emit any of these HAP in sufficient quantities 
to meet the major source definition. Chromium and arsenic compounds are 
emitted in quantities less than 100 pounds per year. Pentachlorophenol 
emissions from a ``worst case'' treatment facility were estimated to be 
less than one tpy.
    For creosote treatment facilities, emissions test results, combined 
with ``worst case'' estimates of fugitive emissions, were used to 
determine total emissions of creosote components. Emissions of 
individual HAP were well under 10 tpy, and total HAP emissions were 
significantly less than 25 tpy. Therefore, the EPA is deleting this 
category from the source category list after concluding that there are 
no major sources in the category.

I. Descriptions of Newly Added Source Categories

    The following presents descriptions for source categories that have 
been added to the list since publication of the initial list of source 
categories, either through today's notice or through previous actions. 
For general descriptions of other categories previously established and 
listed in Table 1, the reader is referred to Docket No. A-90-49, Item 
No. IV-A-55 (EPA-450/3-91-030, entitled ``Documentation for Developing 
the Initial Source Category List''). For subsequent changes to 
descriptions of source categories for which a rule has been 
promulgated, the reader is advised to consult Table 1 for the citation 
of the Federal Register notice which will include the amended 
definition and corresponding rule applicability.
1. Carbon Black Manufacturing
    This source category includes facilities that manufacture carbon 
black using the channel, thermal, or furnace process. The primary 
emission point for the process offgases from the main filter unit. HAP 
emitted include carbonyl sulfide, carbon disulfide, and hydrogen 
cyanide. Carbon black is used to color and strengthen industrial rubber 
products, primarily automotive tires, belts, and hoses. Other major end 
uses for carbon black include specialty black coloring used in toner 
cartridges for copying machines and colorants in inks, paints, and 
vinyl plastic.
2. Ethylene Processes
    The finalized HON excluded ethylene processes from applicability 
under that standard and defined the scope of an ethylene process unit 
as follows:
    ``Ethylene processes'' includes any chemical manufacturing process 
unit in which ethylene and/or propylene are produced by separation from 
petroleum refining process streams or by subjecting hydrocarbons to 
high temperatures in the presence of steam. The ethylene process unit 
includes the separation of ethylene and/or propylene from associated 
streams such as a C<INF>4 product, pyrolysis gasoline, and pyrolysis 
fuel oil. The ethylene process does not include the manufacture of 
SOCMI chemicals such as the production of butadiene from the C<INF>4 
stream and aromatics from pyrolysis gasoline.
3. Flexible Polyurethane Foam Fabrication Operations
    The flexible polyurethane foam fabrication operations source 
category includes facilities engaged in cutting, gluing, and/or 
laminating pieces of flexible polyurethane foam. This includes 
fabrication operations which are located at the sites of foam 
production plants as well as those which are located off-site of foam 
plants. Emissions from foam fabrication primarily result from the use 
of HAP-based adhesives in the gluing process. Methylene chloride is 
currently the most frequently used HAP in adhesives.
4. Friction Products Manufacturing
    This source category includes facilities and processes that 
manufacture or remanufacture friction products including automobile 
brake linings and disc pads. HAP are emitted from solvents added during 
the proportioning and mixing of raw materials and the solvents 
contained in the adhesives used to bond the linings to the brake shoes. 
Most HAP emissions occur during heated processes such as curing, 
bonding and debonding processes. Pollutants from friction products 
facilities include phenol, toluene, methyl chloroform and 
methylethylketone.
5. Leather Tanning and Finishing Operations
    The leather tanning and finishing source category includes 
facilities and processes that use chemical and

[[Page 28202]]

mechanical processes to produce leather having hundreds of different 
finished characteristics. Leather tanning involves primarily wet 
chemical processes that produce a stable, usable product. Leather 
finishing involves a number of conditioning and enhancement processes 
that give tanned leather distinctive and desirable qualities required 
by end users of the material. Sources of HAP emissions in the leather 
tanning and finishing processes include leather finishing operations, 
waterproofing operations, solvent degreasing operations, and 
miscellaneous fugitive sources. HAP from this category include toluene, 
xylene, glycol ethers, methyl isobutyl ketone, and methyl ethyl ketone.
6. Marine Vessel Loading Operations
    This source category includes marine terminals which emit HAP from 
the direct loading and unloading of bulk liquids from marine vessels. 
This category does not include emissions from offshore vessel-to-vessel 
bulk liquid transfer operations (i.e., lightering operations).
    The reader is also referred to a September 19, 1995 notice (60 FR 
48399) for specific applicability of the marine vessel loading 
operations source category.
7. Nitrile Resins Production
    The nitrile resins production source category includes any facility 
which polymerizes acrylonitrile, methyl acrylate, and butadiene latex 
using an emulsion process.
    The reader is also referred to a March 29, 1995 notice (60 FR 
16090) for proposed applicability of the nitrile resins production 
source category.
8. Secondary Lead Smelting (Category of Area Sources)
    The reader is referred to a June 23, 1995 notice (60 FR 32587) for 
specific applicability of the secondary lead smelting area source 
category.

III. Administrative Requirements

A. Docket

    The docket for this regulatory action is A-90-49. The docket is an 
organized and complete file of all the information submitted to or 
otherwise considered by the Agency in the development of this revised 
list of categories of sources and revised schedule for standards. The 
principal purpose of this docket is to allow interested parties to 
identify and locate documents that serve as a record of the process 
engaged in by the Agency to publish today's revision to the initial 
list and schedule. The docket is available for public inspection at the 
EPA's Air and Radiation Docket and Information Center, which is listed 
in the ADDRESSES section of this notice.

B. Regulatory Requirements

1. General
    Today's notice is not a rule; it is essentially a housekeeping or 
maintenance activity which does not impose regulatory requirements or 
costs. Therefore, the EPA has not prepared an assessment of the 
potential costs and benefits pursuant to Executive Order 12866, nor an 
economic impact analysis pursuant to Section 317, nor a regulatory 
flexibility analysis pursuant to the Regulatory Flexibility Act (Pub. 
L. 96-354, September 19, 1980), nor a budgetary impact statement 
pursuant to the Unfunded Mandates Act of 1995. Also, this notice does 
not contain any information collection requirements and, therefore, is 
not subject to the Paperwork Reduction Act, 44 U.S.C. 3501 et seq.
2. Executive Order 12866 and Office of Management and Budget (OMB) 
Review
    Under Executive Order 12866 (58 FR 51735; October 4, 1993), the 
Agency must determine whether a regulatory action is ``significant'' 
and therefore subject to OMB review and the requirements of the 
Executive Order. The Order defines ``significant'' regulatory action as 
one that is likely to lead to a rule that may either (1) have an annual 
effect on this economy of $100 million or more, or adversely and 
materially affecting a sector of the economy, productivity, 
competition, jobs, the environment, public health or safety, or State, 
local or tribal governments or communities; (2) create a serious 
inconsistency or otherwise interfere with an action taken or planned by 
another agency; (3) materially alter the budgetary impact of 
entitlements, grants, user fees, or loan programs or the rights and 
obligations of recipients thereof; or (4) raise novel legal or policy 
issues arising out of legal mandates, the President's priorities, or 
the principles set forth in the Executive Order.
    Pursuant to the terms of Executive Order 12866, it has been decided 
that this is a ``significant regulatory action'' within the meaning of 
the Executive Order. For this reason, this action underwent OMB review. 
The OMB reviewed and released the action without recommending any 
changes.

    Dated: May 17, 1996.
Mary Nichols,
Assistant Administrator for Air and Radiation.

     Table 1.--Categories of Sources of Hazardous Air Pollutants and    
           Regulation Promulgation Schedule By Industry Group           
                      [Revision date: May 17, 1996]                     
------------------------------------------------------------------------
                                                 Scheduled promulgation 
      Industry group, source category <SUP>a          Date/Federal Register  
                                                       Citation <SUP>b       
------------------------------------------------------------------------
Fuel combustion:                                                        
    Engine Test Facilities...................  11/15/00                 
    Industrial Boilers <SUP>c.....................  11/15/00                 
    Institutional/Commercial Boilers <SUP>c.......  11/15/00                 
    Process Heaters..........................  11/15/00                 
    Stationary Internal Combustion Engines <SUP>c.  11/15/00                 
    Stationary Turbines <SUP>c....................  11/15/00                 
Non-ferrous metals processing:                                          
    Lead Acid Battery Manufacturing..........  Deleted                  
    Primary Aluminum Production..............  11/15/97                 
    Primary Copper Smelting..................  11/15/97                 
    Primary Lead Smelting....................  11/15/97                 
    Primary Magnesium Refining...............  11/15/00                 
    Secondary Aluminum Production............  11/15/97                 

[[Page 28203]]

                                                                        
    Secondary Lead Smelting..................  11/15/94                 
                                               60 FR 32587 (F)          
Ferrous metals processing:                                              
    Coke By-Product Plants...................  11/15/00                 
    Coke Ovens: Charging, Top Side, and Door   12/31/92                 
     Leaks.                                                             
                                               58 FR 57898 (F)          
                                               59 FR 01922 (C)          
    Coke Ovens: Pushing, Quenching, and        11/15/00                 
     Battery Stacks.                                                    
    Ferroalloys Production...................  11/15/97                 
    Integrated Iron and Steel Manufacturing..  11/15/00                 
    Iron Foundries...........................  11/15/00                 
    Non-Stainless Steel Manufacturing--        Deleted                  
     Electric Arc Furnace (EAF) Operation.                              
    Stainless Steel Manufacturing--Electric    Deleted                  
     Arc Furnace (EAF) Operation.                                       
    Steel Foundries..........................  11/15/00                 
    Steel Pickling--HCl Process..............  11/15/97                 
Mineral products processing:                                            
    Alumina Processing.......................  11/15/00                 
    Asphalt Concrete Manufacturing...........  11/15/00                 
    Asphalt Processing.......................  11/15/00                 
    Asphalt Roofing Manufacturing............  11/15/00                 
    Asphalt/Coal Tar Application--Metal Pipes  11/15/00                 
    Chromium Refractories Production.........  11/15/00                 
    Clay Products Manufacturing..............  11/15/00                 
    Lime Manufacturing.......................  11/15/00                 
    Mineral Wool Production..................  11/15/97                 
    Portland Cement Manufacturing............  11/15/97                 
    Taconite Iron Ore Processing.............  11/15/00                 
    Wool Fiberglass Manufacturing............  11/15/97                 
Petroleum and natural gas production and                                
 refining:                                                              
    Oil and Natural Gas Production...........  11/15/97                 
    Petroleum Refineries--Catalytic Cracking   11/15/97                 
     (Fluid and other) Units, Catalytic                                 
     Reforming Units, and Sulfur Plant Units.                           
    Petroleum Refineries--Other Sources Not    11/15/94                 
     Distinctly Listed.                                                 
                                               60 FR 43244 (F)          
                                               60 FR 49976 (C)          
Liquids distribution:                                                   
    Gasoline Distribution (Stage 1)..........  11/15/94                 
                                               59 FR 64303 (F)          
                                               60 FR 07627 (C)          
                                               60 FR 32912 (C)          
                                               60 FR 43244 (A)          
                                               60 FR 56133 (a)          
                                               60 FR 62991 (S)          
    Marine Vessel Loading Operations.........  11/15/00                 
                                               60 FR 48399 (F)          
    Organic Liquids Distribution (Non-         11/15/00                 
     Gasoline).                                                         
Surface coating processes:                                              
    Aerospace Industries.....................  11/15/94                 
                                               60 FR 45948 (F)          
    Auto and Light Duty Truck (Surface         11/15/00                 
     Coating).                                                          
    Flat Wood Paneling (Surface Coating).....  11/15/00                 
    Large Appliance (Surface Coating)........  11/15/00                 
    Magnetic Tapes (Surface Coating).........  11/15/94                 
                                               59 FR 64580 (F)          
    Manufacture of Paints, Coatings, and       11/15/00                 
     Adhesives.                                                         
    Metal Can (Surface Coating)..............  11/15/00                 
    Metal Coil (Surface Coating).............  11/15/00                 
    Metal Furniture (Surface Coating)........  11/15/00                 
    Miscellaneous Metal Parts and Products     11/15/00                 
     (Surface Coating).                                                 
    Paper and Other Webs (Surface Coating)...  11/15/00                 
    Plastic Parts and Products (Surface        11/15/00                 
     Coating).                                                          

[[Page 28204]]

                                                                        
    Printing, Coating, and Dyeing of Fabrics.  11/15/00                 
    Printing/Publishing (Surface Coating) <SUP>g..  11/15/94                 
                                               60 FR 13664 (P)          
                                               60 FR 16920 (C)          
    Shipbuilding and Ship Repair (Surface      11/15/94                 
     Coating).                                                          
                                               60 FR 64330 (F)          
    Wood Furniture (Surface Coating).........  11/15/94                 
                                               60 FR 62930 (F)          
Waste treatment and disposal:                                           
    Hazardous Waste Incineration.............  11/15/00                 
    Municipal Landfills......................  11/15/00                 
    Off-Site Waste and Recovery Operations <SUP>f.  11/15/94                 
                                               59 FR 51913 (P)          
                                               59 FR 65744 (R)          
    Publicly Owned Treatment Works (POTW)      11/15/95                 
     Emissions.                                                         
    Sewage Sludge Incineration...............  11/15/00                 
    Site Remediation.........................  11/15/00                 
    Solid Waste Treatment, Storage and         Renamed                  
     Disposal Facilities (TSDF).                                        
Agricultural chemicals production:                                      
    4-Chloro-2-Methylphenoxyacetic Acid        11/15/97                 
     Production.                                                        
    2,4-D Salts and Esters Production........  11/15/97                 
    Butadiene-Furfural Cotrimer (R-11)         11/15/00                 
     Production <SUP>d.                                                      
    Captafol Production <SUP>d....................  11/15/97                 
    Captan Production <SUP>d......................  11/15/97                 
    Chloroneb Production <SUP>d...................  11/15/97                 
    Chlorothalonil Production <SUP>d..............  11/15/97                 
    Dacthal (tm) Production <SUP>d................  11/15/97                 
    Sodium Pentachlorophenate Production <SUP>g...  11/15/97                 
    Tordon (tm) Acid Production <SUP>d............  11/15/97                 
Fibers production processes:                                            
    Acrylic Fibers/Modacrylic Fibers           11/15/97                 
     Production.                                                        
    Rayon Production.........................  11/15/00                 
    Spandex Production.......................  11/15/00                 
Food and agriculture processes:                                         
    Baker's Yeast Manufacturing..............  11/15/00                 
    Cellulose Food Casting Manufacturing.....  11/15/00                 
    Vegetable Oil Production.................  11/15/00                 
Pharmaceutical production processes:                                    
    Pharmaceuticals Production <SUP>d.............  11/15/97                 
Polymers and resins production:                                         
    Acetal Resins Production.................  11/15/97                 
    Acrylonitrile-Butadiene-Styrene            11/15/94                 
     Production.                                                        
                                               60 FR 16090 (P)          
    Alkyd Resins Production..................  11/15/00                 
    Amino Resins Production..................  11/15/97                 
    Boat Manufacturing.......................  11/15/00                 
    Butadiene Furfural Cotrimer (R-11)         Moved                    
     Production.                                                        
    Butyl Rubber Production..................  11/15/94                 
                                               60 FR 30801 (P)          
    Carboxymethylcellulose Production........  11/15/00                 
    Cellophane Production....................  11/15/00                 
    Cellulose Ethers Production..............  11/15/00                 
    Epichlorohydrin Elastomers Production....  11/15/94                 
                                               60 FR 30801 (P)          
    Epoxy Resins Production..................  11/15/94                 
                                               60 FR 12670 (F)          
    Ethylene-Propylene Rubber Production.....  11/15/94                 
                                               60 FR 30801 (P)          

[[Page 28205]]

                                                                        
    Flexible Polyurethane Foam Production....  11/15/97                 
    Hypalon (tm) Production <SUP>d................  11/15/94                 
                                               60 FR 30801 (P)          
    Maleic Anhydride Copolymers Production...  11/15/00                 
    Methylcellulose Production...............  11/15/00                 
    Methyl Methacrylate-Acrylonitrile-         11/15/94                 
     Butadiene-Styrene Production <SUP>d.                                    
                                               60 FR 16090 (P)          
    Methyl Methacrylate-Butadiene-Styrene      11/15/94                 
     Terpolymers Production  <SUP>d.                                         
                                               60 FR 16090 (P)          
    Neoprene Production......................  11/15/94                 
                                               60 FR 30801 (P)          
    Nitrile Butadiene Rubber Production......  11/15/94                 
                                               60 FR 30801 (P)          
    Nitrile Resins Production................  11/15/00                 
                                               60 FR 16090 (P)          
    Non-Nylon Polyamides Production..........  11/15/94                 
                                               60 FR 12670 (F)          
    Nylon 6 Production.......................  11/15/97                 
    Phenolic Resins Production...............  11.15.97                 
    Polybutadiene Rubber Production <SUP>d........  11/15/94                 
                                               60 FR 30801 (P)          
    Polycarbonates Production <SUP>d..............  11/15/97                 
    Polyester Resins Production..............  11/15/00                 
    Polyether Polyols Production.............  11/15/97                 
    Polyethylene Terephthalate Production <SUP>g..  11/15/94                 
                                               60 FR 16090 (P)          
    Polymerized Vinylidene Chloride            11/15/00                 
     Production.                                                        
    Polymethyl Methacrylate Resins Production  11/15/00                 
    Polystyrene Production...................  11/15/94                 
                                               60 FR 16090 (P)          
    Polysulfide Rubber Production <SUP>d..........  11/15/94                 
                                               60 FR 30801 (P)          
    Polyvinyl Acetate Emulsions Production...  11/15/00                 
    Polyvinyl Alcohol Production.............  11/15/00                 
    Polyvinyl Butyral Production.............  11/15/00                 
    Polyvinyl Chloride and Copolymers          11/15/00                 
     Production.                                                        
    Reinforced Plastic Composites Production.  11/15/97                 
    Styrene-Acrylonitrile Production <SUP>g.......  11/15/94                 
                                               60 FR 16090 (P)          
    Styrene-Butadiene Rubber and Latex         11/15/94                 
     Production <SUP>d.                                                      
                                               60 FR 3080 (P)           
Production of inorganic chemicals:                                      
    Ammonium Sulfate Production--Caprolactam   11/15/00                 
     By-Product Plants.                                                 
    Antimony Oxides Manufacturing............  11/15/00                 
    Carbon Black Production..................  11/15/00                 
    Chlorine Production <SUP>d....................  11/15/97                 
    Chromium Chemicals Manufacturing.........  Deleted                  
    Cyanuric Chloride Production.............  11/15/97                 
    Fume Silica Production...................  11/15/00                 
    Hydrochloric Acid Production.............  11/15/00                 
    Hydrogen Cyanide Production..............  11/15/97                 
    Hydrogen Fluoride Production.............  11/15/00                 
    Phosphate Fertilizers Production.........  11/15/00                 
    Phosphoric Acid Manufacturing............  11/15/00                 
    Quaternary Ammonium Compounds Production.  Moved                    

[[Page 28206]]

                                                                        
    Sodium Cyanide Production................  11/15/97                 
    Uranium Hexafluoride Production..........  11/15/00                 
Production of organic chemicals                                         
    Ethylene Processes.......................  11/15/00                 
    Quarternary Ammonium Compounds Production  11/15/00                 
    Synthetic Organic Chemical Manufacturing.  11/15/92                 
                                               59 FR 19402 (F)          
                                               59 FR 29196 (A)          
                                               59 FR 48175 (C)          
                                               59 FR 53359 (S)          
                                               59 FR 53392 (a)          
                                               59 FR 54131 (S)          
                                               59 FR 54154 (a)          
                                               60 FR 05320 (S)          
                                               60 FR 18020 (A)          
                                               60 FR 18071 (a)          
Miscellaneous processes                                                 
    Aerosol Can-Filling Facilities...........  11/15/00                 
    Benzyltrimethylammonium Chloride           11/15/00                 
     Production.                                                        
    Butadiene Dimers Production..............  Renamed                  
    Carbonyl Sulfide Production..............  11/15/00                 
    Chelating Agents Production..............  11/15/00                 
    Chlorinated Paraffins Production <SUP>d.......  11/15/00                 
    Chromic Acid Anodizing...................  11/15/94                 
                                               60 FR 04948 (F)          
                                               60 FR 27598 (C)          
                                               60 FR 33122 (C)          
    Commercial Dry Cleaning                    11/15/92                 
     (Perchloroethylene)--Transfer Machines.   58 FR 49354 (F)          
                                               58 FR 66287 (A)          
    Commercial Sterilization Facilities......  11/15/94                 
                                               59 FR 62585 (F)          
    Decorative Chromium Electroplating.......  11/15/94                 
                                               60 FR 04948 (F)          
                                               60 FR 27598 (C)          
                                               60 FR 33122 (C)          
    Dodecanedioic Acid Production............  Subsumed                 
    Dry Cleaning (Petroleum Solvent).........  11/15/00                 
    Ethylidene Norbornene Production <SUP>d.......  11/15/00                 
    Explosives Production....................  11/15/00                 
    Flexible Polyurethane Foam Fabrication     11/15/00                 
     Operations.                                                        
    Friction Products Manufacturing..........  11/15/00                 
    Halogenated Solvent Cleaners.............  11/15/94                 
                                               59 FR 61801 (F)          
                                               59 FR 67750 (C)          
                                               60 FR 29484 (C)          
    Hard Chromium Electroplating.............  11/15/94                 
                                               60 FR 04948 (F)          
                                               60 FR 27598 (C)          
                                               60 FR 33122 (C)          
    Hydrazine Production.....................  11/15/00                 

[[Page 28207]]

                                                                        
    Industrial Cleaning (Perchloroethylene)--  11/15/92                 
     Dry-to-dry machines.                      58 FR 49354 (F)          
                                               58 FR 66287 (A)          
    Industrial Dry Cleaning                    11/15/92                 
     (Perchloroethylene)--Transfer Machines.   58 FR 49354 (F)          
                                               58 FR 66287 (A)          
    Industrial Process Cooling Towers........  11/15/94                 
                                               59 FR 46339 (F)          
    Leather Tanning and Finishing Operations.  11/15/00                 
    OBPA/1,3-Diisocyanate Production <SUP>d.......  11/15/00                 
    Paint Stripper Users.....................  11/15/00                 
    Photographic Chemicals Production........  11/15/00                 
    Phthalate Plasticizers Production........  11/15/00                 
    Plywood/Particle Board Manufacturing.....  11/15/00                 
    Polyether Polyols Production.............  Moved                    
    Pulp and Paper Production................  11/15/97                 
                                               58 FR 66078 (P)          
                                               59 FR 12567 (C)          
                                               61 FR 09383 (P)          
    Rocket Engine Test Firing................  11/15/00                 
    Rubber Chemicals Manufacturing...........  11/15/00                 
    Semiconductor Manufacturing..............  11/15/00                 
    Symmetrical Tetrachloropyridine            11/15/00                 
     Production <SUP>d.                                                      
    Tetrahydrobenzaldehyde Production........  11/15/97                 
    Tire Production..........................  11/15/00                 
    Wood Treatment...........................  Deleted                  
Categories of area sources: <SUP>e                                           
    Asbestos Processing......................  Deleted                  
    Chromic Acid Anodizing...................  11/15/94                 
                                               60 FR 04948 (F)          
                                               60 FR 27598 (C)          
                                               60 FR 33122 (C)          
                                                                        
                                                                        
    Commercial Dry Cleaning                    11/15/92                 
     (Perchloroethylene)--Dry-to-Dry Machines. 58 FR 49354 (F)          
                                               58 FR 66287 (A)          
    Commercial Dry Cleaning                    11/15/92                 
     (Perchloroethylene) Transfer Machines.    58 FR 49354 (F)          
                                               58 FR 66287 (A)          
    Commercial Sterilization Facilities......  11/15/94                 
                                               59 FR 62585 (F)          
                                                                        
    Decorative Chromium Electroplating.......  11/15/94                 
                                               60 FR 04948 (F)          
                                               60 FR 27598 (C)          
                                               60 FR 33122 (C)          
                                                                        
    Halogenated Solvent Cleaners.............  11/15/94                 
                                               59 FR 61801 (F)          
                                               59 FR 67750 (C)          
                                               60 FR 29484 (C)          
                                                                        

[[Page 28208]]

                                                                        
                                                                        
    Hard Chromium Electroplating.............  11/15/94                 
                                               60 FR 04948 (F)          
                                               60 FR 27598 (C)          
                                               60 FR 33122 (C)          
                                                                        
                                                                        
    Secondary Lead Smelting..................  11/15/00                 
                                               60 FR 32587 (F)          
------------------------------------------------------------------------
<SUP>a Only major sources within any category shall be subject to emission   
  standards under Section 112 unless a finding is made of a threat of   
  adverse effects to human health or the environment for the area       
  sources in a category. All listed categories are exclusive of any     
  specific operations or processes included under other categories that 
  are listed separately.                                                
<SUP>b The markings in the ``Scheduled Promulgation Date/Federal Register    
  Citation'' column of Table 1 denote the following:                    
 (A): amendment to a final rulemaking action                            
 (A): proposed amendment to a final rulemaking action                   
 (C): correction (or clarification) published subsequent to a proposed  
  or final rulemaking action                                            
 (F): final rulemaking action                                           
(P): proposed rulemaking action                                         
(R): reopening of a proposed action for public comment                  
(S): announcement of a stay, or partial stay, of the rule requirements  
Moved: the source category is relocated to a more appropriate industry  
  group                                                                 
Subsumed: the source category is included within the definition of      
  another listed category and therefore is no longer listed as a        
  separate source category                                              
Renamed: the title of this source category is changed to a more         
  appropriate title                                                     
Deleted: the source category is officially removed from the source      
  category list                                                         
<SUP>c Sources defined as electric utility steam generating units under      
  Section 112 (A)(8) shall not be subject to emission standards pending 
  the findings of the study required under Section 112(n)(1).           
<SUP>d Equipment handling specific chemicals for these categories or subsets 
  of these categories are subject to a negotiated standard for equipment
  leaks contained in the Hazardous Organic NESHAP (HON), which was      
  promulgated on April 22, 1994. The HON includes a negotiated standard 
  for equipment leaks from the SOCMI category and 20 non-SOCMI          
  categories (or subsets of these categories). The specific processes   
  affected within the categories are listed in Section XX.X0 (C) of the 
  March 6, 1991 Federal Register notice (56 FR 9315).                   
<SUP>e A finding of threat of adverse effects to human health or the         
  environment was made for each category of area sources listed.        
The following footnotes apply to source categories that are subject to  
  court ordered promulgation deadlines (differing from the above listed 
  regulatory deadlines) in accordance with a consent decree entered in  
  Sierra Club v. Browner, Case No. 93-0124 (And related cases) (D.C.    
  Dist. Ct.).                                                           
<SUP>f judicial deadline: 05/13/96                                           
<SUP>g judicial deadline: 05/15/96                                           


[FR Doc. 96-13824 Filed 6-3-96; 8:45 am]
BILLING CODE 6560-50-P