Risk and Technology Review, Phase II, Group 2, 14734-14750 [E7-5805]

Agencies

• ENVIRONMENTAL PROTECTION AGENCY

[Federal Register Volume 72, Number 60 (Thursday, March 29, 2007)]
[Proposed Rules]
[Pages 14734-14750]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-5805]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 63

[EPA-HQ-OAR-2006-0859; FRL-8293-4]
RIN 2060-AN85


Risk and Technology Review, Phase II, Group 2

AGENCY: Environmental Protection Agency (EPA).

ACTION: Advance notice of proposed rulemaking (ANPRM).

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SUMMARY: This ANPRM asks for public comment on hazardous air pollutant 
emissions and other model input data that EPA intends to use to assess 
residual risk from selected industrial major source categories, as 
required by the Clean Air Act. Specifically, the data are comprised of 
hazardous air pollutant emission estimates and emission release 
parameters for 22 industrial source categories subject to 12 national 
emission standards for hazardous air pollutants for hazardous air 
pollutants with compliance dates of 2002 and earlier. The source of 
this information is the February 2006 version of the 2002 National 
Emissions Inventory, updated with some facility-specific data collected 
by EPA. We are seeking comment on the emissions and source data found 
at the Risk and Technology Review Web site and we are providing the 
opportunity for the public to submit technical corrections and updates. 
Following review of comments received, we will update the data, as 
appropriate, and assess risk for these source categories. We will use 
these risk estimates and our evaluation of the availability, cost, and 
feasibility of emissions reduction options to determine the ample 
margin of safety for residual risk and to fulfill our obligations to 
conduct a technology review. We currently anticipate using the results 
of these risk estimates along with review of control technology as the 
basis for our decisions on whether to propose additional standards to 
address residual risk for each source category. There will be 
opportunity for oral and written comment on any additional standards 
when we publish our Notice of Proposed Rulemaking (NPRM). We anticipate 
proposing the results of this risk and technology review for these 22 
source categories by fall 2007.

DATES: Comments must be received on or before May 29, 2007.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-HQ-
OAR-2006-0859 by one of the following methods:
     https://www.regulations.gov. Follow the online instructions 
for submitting comments.
     E-mail: a-and-r-docket@epamail.epa.gov.
     Fax: (202) 566-1741.
     Mail: U.S. Postal Service, send comments to: Air and 
Radiation Docket (6102T), Docket ID No. EPA-HQ-OAR-2006-0859, U.S. 
Environmental Protection Agency, 1200 Pennsylvania Avenue, NW., 
Washington, DC 20460. Please include a total of two copies.
     Hand Delivery: In person or by Courier, deliver comments 
to: Air and Radiation Docket (6102T), EPA West, Room 3334, 1301 
Constitution Ave., NW., Washington, DC 20004. Such deliveries are 
accepted only during the Docket's normal hours of operation, and 
special arrangements should be made for deliveries of boxed 
information.
    Instructions: Direct your comments to Docket ID No. EPA-HQ-OAR-
2006-0859. EPA's policy is that all comments received will be included 
in the public docket without change and may be made available online at 
https://www.regulations.gov, including any personal information 
provided, unless the comment includes information claimed to be 
confidential business information (CBI) or other information whose 
disclosure is restricted by statute. Do not submit information that you 
consider to be CBI or otherwise protected through www.regulations.gov 
or e-mail. The https://www.regulations.gov Web site is an ``anonymous 
access'' system, which means EPA will not know your identity or contact 
information unless you provide it in the body of your comment. If you 
send an e-mail comment directly to EPA without going through https://
www.regulations.gov, your e-mail address will be automatically captured 
and included as part of the comment that is placed in the public docket 
and made available on the Internet. If you submit an electronic 
comment, EPA recommends that you include your name and other contact 
information in the body of your comment and with any disk or CD-ROM you 
submit. If EPA cannot read your comment due to technical difficulties 
and cannot contact you for clarification, EPA may not be able to 
consider your comment. Electronic files should avoid the use of special 
characters, any form of encryption, and be free of any defects or 
viruses. For additional information about EPA's public docket visit the 
EPA Docket Center homepage at https://www.epa.gov/epahome/dockets.htm.
    Docket: All documents in the docket are listed in the https://
www.regulations.gov index. Although listed in the index, some 
information is not publicly available, i.e., CBI or other information 
whose disclosure is restricted by statute. Certain other material, such 
as copyrighted material, will be publicly available only in hard copy. 
Publicly available docket materials are available either electronically 
in https://www.regulations.gov or in hard copy at the Air and Radiation 
Docket, EPA West, Room 3334, 1301 Constitution Avenue, NW., Washington, 
DC. The Public Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday 
through Friday, excluding legal holidays. The telephone number for the 
Public Reading Room is (202) 566-1744, and the telephone number for the 
Air and Radiation Docket is (202) 566-1742.

    Note: The EPA Docket Center suffered damage due to flooding 
during the last week of June 2006. The Docket Center is continuing 
to operate. However, during the cleanup, there will be temporary 
changes to Docket Center telephone numbers, addresses, and hours of 
operation for people who wish to make hand deliveries or visit the 
Public Reading Room to view documents. Consult EPA's Federal 
Register notice at 71 FR 38147 (July 5, 2006) or the EPA Web site at 
https://www.epa.gov/epahome/dockets.htm for current information on 
docket operations, locations, and telephone numbers. The Docket 
Center's mailing address for U.S. mail and the procedure for 
submitting comments to https://www.regulations.gov are not affected 
by the flooding and will remain the same.


FOR FURTHER INFORMATION CONTACT: For general information about this 
ANPRM, contact Ms. Paula Hirtz, Office and Air Quality Planning and 
Standards, Sector Policies and Programs Division, Coatings and 
Chemicals Group (E143-01), U.S. Environmental Protection Agency, 
Research Triangle Park, North Carolina 27711; telephone number: (919) 
541-2618; fax number: (919) 541-0246; and e-mail address: 
hirtz.paula@epa.gov.

[[Page 14735]]

    For information specific to the National Emissions Inventory (NEI), 
contact Ms. Anne Pope, Air Quality and Assessment Division (Office and 
Air Quality Planning and Standards), Mail Code C339-02, U.S. 
Environmental Protection Agency, Research Triangle Park, North Carolina 
27711; telephone number: (919) 541-5373; fax number: (919) 541-0684; 
and e-mail address: pope.anne@epa.gov.

SUPPLEMENTARY INFORMATION:
    Regulated Entities. Entities potentially affected by this action 
include facilities containing any one or more of the 22 major source 
categories subject to the 12 national emission standards for hazardous 
air pollutants (NESHAP) (or commonly referred to maximum achievable 
control technology (MACT) standards) listed in Table 1. This action 
does not affect area sources, as these NESHAP do not apply to area 
sources. Industries regulated by these MACT are classified by the North 
American Industry Classification System (NAICS) codes shown in Table 1. 
In addition, a classification system of MACT codes has been developed 
and is used in the 2002 NEI to identify processes included in each MACT 
source category. The MACT codes for the 22 source categories addressed 
in this notice are also displayed in Table 1.

Table 1.--MACT Standards, Source Categories, and Corresponding NAICS and
                   MACT Codes Addressed by This ANPRM
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   MACT standard/source category name       NAICS codes      MACT code
------------------------------------------------------------------------
Mineral Wool Production.................          327993             409
Aerospace Manufacturing and Rework                336411            0701
 Facilities.............................
Marine Tank Vessel Loading Operations...            4883            0603
Natural Gas Transmission and Storage....          486210            0504
Oil and Natural Gas Production..........             211            0501
Petroleum Refineries....................           32411            0503
Pharmaceuticals Production..............            3254            1201
Group I Polymers and Resins:
    Epichlorohydrin Elastomers                    325212            1311
     Production.........................
    Hypalon(TM) Production..............          325212            1315
    Nitrile Butadiene Rubber Production.          325212            1321
    Polybutadiene Rubber Production.....          325212            1325
    Styrene-Butadiene Rubber and Latex            325212            1339
     Production.........................
Group IV Polymers and Resins:
    Acrylic-Butadiene-Styrene Production          325211            1302
    Methyl Methacrylate-Acrylonitrile-            325211            1317
     Butadiene-Styrene Production.......
    Methyl Methacrylate-Butadiene-                325211            1318
     Styrene Production.................
    Nitrile Resins Production...........          325211            1342
    Polyethylene Terephthalate                    325211            1328
     Production.........................
    Polystyrene Production..............          325211            1331
    Styrene-Acrylonitrile Production....          325211            1338
Primary Aluminum Reduction Plants.......          331312            0201
Printing and Publishing Industry........           32311            0714
Shipbuilding and Ship Repair Operations.          336611            0715
------------------------------------------------------------------------

    Submitting Comments/CBI. When submitting comments, remember to 
identify this ANPRM by docket number and other identifying information 
(subject heading, Federal Register date, and page number). Also, make 
sure to submit your comments by the comment period deadline identified. 
As described further in section VII of this ANPRM, specific data change 
suggestions need to be accompanied by supporting documentation that 
includes a description of any assumptions used and any technical 
information and/or data that you used.
    Do not submit CBI to EPA through www.regulations.gov or e-mail. 
Instead, send or deliver information identified as CBI only to the 
following address: Mr. Roberto Morales, OAQPS Document Control Officer 
(C404-02), U.S. Environmental Protection Agency, Office of Air Quality 
Planning and Standards, Research Triangle Park, NC 27711, Attention 
Docket ID No. EPA-HQ-OAR-2006-0859. Clearly mark the part or all of the 
information that you claim to be CBI. For CBI information on a disk or 
CD-ROM that you mail to Mr. Morales, mark the outside of the disk or 
CD-ROM as CBI and then identify electronically within the disk or CD-
ROM the specific information that is claimed as CBI. In addition to one 
complete version of the comment that includes information claimed as 
CBI, a copy of the comment that does not contain the information 
claimed as CBI must be submitted for inclusion in the public docket. If 
you submit a CD-ROM or disc that does not contain CBI, mark the outside 
of the disk or CD-ROM clearly that it does not contain CBI. Information 
not marked as CBI will be included in the public docket and EPA's 
electronic public docket without prior notice.
    If you have any questions about CBI or the procedures for claiming 
CBI, please consult the person identified in the FOR FURTHER 
INFORMATION CONTACT section. Information marked as CBI will not be 
disclosed except in accordance with procedures set forth in 40 CFR part 
2.
    Worldwide Web (WWW). In addition to being available in the docket, 
an electronic copy of today's notice is also available on the World 
Wide Web through the Technology Transfer Network (TTN). Following 
signature by the EPA Administrator, a copy of today's notice will be 
posted on the TTN's policy and guidance page for newly proposed or 
promulgated NESHAP at https://www.epa.gov/ttn/oarpg. The TTN provides 
information and technology exchange in various areas of air pollution 
control.
    As discussed in more detail in section VI of this ANPRM, additional 
information is available on the Risk and Technology Review Phase II Web 
page at https://www.epa.gov/ttn/atw/rrisk/rtrpg.html. This information 
includes source category descriptions and detailed emissions and other 
data that will be used as model inputs.
    Outline. The information presented in this preamble is organized as 
follows:


[[Page 14736]]


I. Background
II. What approach is EPA taking for the Risk and Technology Review?
    A. What is the approach we are taking to address residual risk 
for the Group 2 source categories?
    B. What data were compiled and reviewed?
    C. What are the steps planned before proposing NESHAP to address 
residual risk?
    D. How will we develop proposed NESHAP to address residual risk?
    E. When will the NESHAP be proposed and promulgated?
III. What is the purpose of this ANPRM?
IV. What data are in the ANPRM data sets for each source category?
V. What are we specifically seeking comment on?
VI. How may I access the data for a specific source category?
VII. How do I submit suggested data corrections?
VIII. What additional steps are expected after EPA reviews the 
comments received?

I. Background

    Section 112 of the Clean Air Act (CAA) establishes a two-stage 
regulatory process to address emissions of hazardous air pollutants 
(HAP) from stationary sources. In the first stage, after EPA has 
identified categories of sources emitting one or more of the HAP listed 
in CAA section 112(b), section 112(d) of the CAA calls for promulgation 
of technology-based emission standards for those sources. For ``major 
sources'' that emit or have the potential to emit 10 tons per year or 
more of any single HAP or 25 tons per year or more of any combination 
of HAP, these technology-based standards must reflect the maximum 
reductions of HAP achievable (after considering cost, energy 
requirements, and non-air health and environmental impacts). These 
technology based standards are commonly referred to as MACT standards. 
Between 1993 and 2004, EPA published 96 MACT standards (or NESHAP) 
covering 174 source categories. In this first stage, the focus was on 
ensuring reductions through available technologies. CAA Section 
112(d)(6) requires EPA to review these emission standards and to revise 
them ``as necessary (taking into account developments in practices, 
processes, and control technologies)'' no less frequently than every 8 
years.
    The second stage in standard-setting focuses on reducing any 
remaining ``residual'' risk according to CAA section 112(f). This 
provision requires, first, that EPA prepare a Report to Congress 
discussing (among other things) methods of calculating risk posed (or 
potentially posed) by sources after implementation of the MACT 
standards, the public health significance of those risks, the means and 
costs of controlling them, actual health effects to persons in 
proximity of emitting sources, and recommendations as to legislation 
regarding such remaining risk. EPA prepared and submitted this report 
(Residual Risk Report to Congress, EPA-453/R-99-001) in March 1999. 
Congress did not act in response to the report, thereby triggering 
EPA's obligation under CAA section 112(f)(2) to analyze and address 
residual risk.
    Section 112(f)(2) of the CAA then directs EPA to assess the risk 
remaining (residual risk) after the application of the MACT standards 
and promulgate more stringent standards for a category or subcategory 
of sources subject to MACT standards if promulgation of such standards 
is necessary to protect public health with an ample margin of safety or 
to prevent (taking into consideration various factors) adverse 
environmental effects. The standards to be promulgated under this 
subsection must ``provide an ample margin of safety to protect public 
health in accordance with this section (as in effect before the date of 
enactment of the CAA Amendments of 1990), unless the Administrator 
determines that a more stringent standard is necessary to prevent, 
taking into consideration costs, energy, safety, and other relevant 
factors, an adverse environmental impact.'' Section 112(f)(2) of the 
CAA expressly preserves our use of a two-step process for developing 
standards to address any residual risk and our interpretation of 
``ample margin of safety'' developed in the ``National Emission 
Standards for Hazardous Air Pollutants: Benzene Emissions from Maleic 
Anhydride Plants, Ethylbenzene/Styrene Plants, Benzene Storage Vessels, 
Benzene Equipment Leaks, and Coke By-Product Recovery Plants'' (Benzene 
NESHAP) (54 FR 38044, September 14, 1989).
    To date, EPA has conducted CAA 112(d)(6) technology reviews and 
promulgated residual risk standards for eight (Halogenated Solvents 
will be promulgated in April 2007) individual NESHAP and their 
associated source categories. In an effort to streamline this process 
for the remaining source categories, EPA plans to address residual risk 
and perform a technology review for several source categories in one 
combined effort. While the standard review and development process will 
be streamlined, each source category will be assessed independently and 
decisions on the level of any standards will be made individually for 
each source category. The first set of MACT source categories for which 
this streamlined process will be undertaken includes the 50 source 
categories listed in Table 2, all of which have MACT compliance dates 
of 2002 and earlier. (Except for the Chemical Recovery Combustion 
Sources at Kraft, Soda, Sulfite, and Stand-Alone Semichemical Pulp 
Mills source category, which has a compliance date of January 2004, 
these facilities are believed to be in compliance with MACT as of 2002, 
so the NEI reflects their post-MACT compliance emissions.) This action 
is referred to as Phase II of the Risk and Technology Review (RTR) 
process (where the first eight individual NESHAP comprise Phase I). 
Other MACT standards will be reviewed in the future. While the initial 
phases of data compilation and EPA internal review processes have been 
completed for each of the 50 source categories included in RTR Phase 
II, the source categories have been divided into smaller groups to ease 
the burden on public commenters and EPA's review of public comments and 
the rulemaking processes. Table 2 shows the source categories EPA 
anticipates including in each group of the RTR Phase II.

 Table 2.--Source Categories and Corresponding NAICS and MACT Codes Included in Risk and Technology Review Phase
                                                       II
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             RTR Phase II group                      Source category name           NAICS codes      MACT code
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1..........................................  Acetal Resins Production...........          325211            1301
                                             Hydrogen Fluoride Production.......          325120            1409
                                             Group I Polymers and Resins:
                                                Butyl Rubber Production.........          325212            1307
                                                Ethylene-Propylene Rubber                 325212            1313
                                                 Production.
                                                Polysulfide Rubber Production...          325212            1332
                                                Neoprene Production.............          325212            1320
                                             Group II Polymers and Resins:

[[Page 14737]]

 
                                                Epoxy Resins Production.........          325211            1312
                                                Non-Nylon Polyamides Production.          325211            1322
2..........................................  Mineral Wool Production............          327993             409
                                             Aerospace Manufacturing and Rework.          336411             701
                                             Marine Tank Vessel Loading.........            4883             603
                                             Natural Gas Transmission & Storage.          486210             504
                                             Oil and Natural Gas Production.....             211             501
                                             Petroleum Refineries...............           32411             503
                                             Pharmaceuticals Production.........            3254            1201
                                             Group I Polymers and Resins:
                                                Epichlorohydrin Elastomers                325212            1311
                                                 Production.
                                                Hypalon(TM) Production..........          325212            1315
                                                Nitrile Butadiene Rubber                  325212            1321
                                                 Production.
                                                Polybutadiene Rubber Production.          325212            1325
                                                Styrene-Butadiene Rubber and              325212            1339
                                                 Latex Production.
                                             Group IV Polymers and Resins:
                                                Acrylic-Butadiene-Styrene                 325211            1302
                                                 Production.
2..........................................  Group IV Polymers and Resins:
                                                Methyl Methacrylate-                      325211            1317
                                                 Acrylonitrile-Butadiene-Styrene
                                                 Production.
                                                Methyl Methacrylate-Butadiene-            325211            1318
                                                 Styrene Production.
                                                Nitrile Resins Production.......          325211            1342
                                                Polyethylene Terephthalate                325211            1328
                                                 Production.
                                                Polystyrene Production..........          325211            1331
                                                Styrene-Acrylonitrile Production          325211            1338
                                             Primary Aluminum Reduction Plants..          331312             201
                                             Printing and Publishing Industry...           32311             714
                                             Shipbuilding and Ship Repair.......          336611             715
Other......................................  Acrylic/Modacrylic Fibers..........          325222            1001
                                             Chromium Electroplating:
                                                Chromic Acid Anodizing..........          332813            1607
                                                Decorative Chromium                       332813            1610
                                                 Electroplating.
                                                Hard Chromium Electroplating....          332813            1615
                                             Ferroalloys Production.............          331112             304
                                             Flexible Polyurethane Foam.........          326150            1314
Other......................................  Kraft, Sulfite, Semi-chemical, Soda
                                              Pulping Processes and Mechanical,
                                              Secondary Fiber, and Non-wood
                                              Pulping Processes and Papermaking
                                              Systems:
                                                Pulp and Paper Production.......            3221          1626-1
                                             Chemical Recovery Combustion
                                              Sources at Kraft, Soda, Sulfite,
                                              and Stand-Alone Semichemical Pulp
                                              Mills:
                                                Pulp and Paper Production.......            3221          1626-2
                                             Off-site Waste and Recovery........             562             806
                                             Phosphate Fertilizer Production....          325312            1410
                                             Phosphoric Acid Manufacturing......          325312            1411
                                             Polycarbonates Production..........          325199            1326
                                             Polyether Polyols Production.......          325199            1625
                                             Portland Cement Manufacturing......            3273             410
                                             Primary Lead Smelting..............          331419             204
                                             Publicly Owned Treatment Works.....          221320             803
                                             Secondary Aluminum Production......          331314             202
                                             Secondary Lead Smelting............          331492             205
                                             Steel Pickling-HCl Process.........          331111             310
                                             Wood Furniture Manufacturing.......          337122             716
                                             Wool Fiberglass Manufacturing......          327993             412
----------------------------------------------------------------------------------------------------------------

    This ANPRM addresses only the 22 source categories included in 
Group 2. As initial analyses for each source category included in Group 
1 of the RTR Phase II indicate that estimated health risks to the 
individual most exposed to emissions from a facility in the source 
category meet levels the Agency considers to be without appreciable 
health risk and it is improbable that these source categories emit 
pollutants that would cause adverse environmental effects, we plan to 
publish a Notice of Proposed Rulemaking (NPRM) in the Federal Register 
for the 8 source categories in Group 1 without previously issuing an 
ANPRM. The remaining source categories were split into two groups. 
Group 2 is generally comprised of source categories with earlier 
deadlines, fewer multipathway concerns, and categories that the Agency 
believes will require fewer resources to complete. The source 
categories in the other group generally have later deadlines and more 
multipathway concerns. Additional notices will be published addressing 
the other source categories in the future.

II. What approach is EPA taking for the Risk and Technology Review?

A. What is the approach we are taking to address residual risk for the 
Group 2 source categories?

    We plan to follow the same general process in revising NESHAP to 
address residual risk for each of Group 2 source categories listed in 
the table above. This

[[Page 14738]]

general approach includes the following primary steps:
    1. Compile and review (and update with facility-specific data 
collected by EPA in some cases) readily available source category 
emissions data from the 2002 NEI.
    2. For each group of source categories, conduct preliminary 
evaluations to identify key HAP and data anomalies.
    3. Make emissions and other modeling input data, along with a list 
of the identified key HAP and data anomalies, available for public 
comment through an ANPRM.
    4. Reconcile and update emissions and other modeling input data, 
based on comments received, and conduct a risk assessment for each 
category.
    5. Develop and propose CAA section 112(f)(2) residual risk and CAA 
section 112(d)(6) technology review standard(s) as appropriate.
    6. Address comments from the proposal(s) and promulgate CAA section 
112(f)(2) residual risk and CAA 112(d)(6) technology standard(s), where 
necessary.
    An independent scientific peer consultation is currently underway 
to review the approach for assessing residual risk for the source 
categories included in the RTR Phase II. This peer consultation will be 
conducted by a panel of EPA's Science Advisory Board, and will focus 
on: (1) The source of emissions and other modeling data and the 
approach for refining this data, (2) the analytical approach for 
quantifying and characterizing human and environmental exposures and 
risks, and (3) the types of results that will be generated and the 
format for the characterization of assessment results.
    The process outlined above for the 22 source categories included in 
Group 2 of the RTR Phase II is described in more detail in the 
following discussion.

B. What data were compiled and reviewed?

    In the first step of this process, we used the 2002 NEI Final 
Version 1 (made publicly available on February 26, 2006) as a starting 
point and compiled emissions information for each source category and 
performed an internal engineering review of these data (referred to 
hereafter as ``initial NEI data''). The primary data attributes 
evaluated in this review included: (1) Facility representation in each 
source category (i.e., we ensured that source categories accurately 
included facilities making the products characteristic of the source 
categories), and (2) appropriateness of facility emissions, in both the 
inclusion of the appropriate HAP, and in the magnitude of those HAP 
emissions. In cases where better data were known to exist for a 
particular source category, that information was integrated into the 
data set for that source category. These reviewed and integrated data 
sets for each source category are referred to hereafter as the ``ANPRM 
data sets.''

C. What are the steps planned before proposing NESHAP to address 
residual risk?

    In this ANPRM, we are seeking public review and comment on the 
emissions and other model input data included in the ANPRM data sets 
for the source categories included in Group 2 of the RTR Phase II. 
These source categories are listed in Table 1. We will evaluate the 
comments and data corrections received in response to this ANPRM and 
update the data for the source categories in Group 2, as appropriate. 
In accordance with the methodologies described in the Residual Risk 
Report to Congress, we will then use the revised model input data sets 
for these source categories (referred to as the notice of proposed 
rulemaking, or NPRM, data sets) in an analysis of the inhalation risks. 
The Human Exposure Model (Community and Sector HEM-3 version 1.1.0) 
will be used to perform this modeling. The HEM-3 model performs three 
main operations: dispersion modeling, estimation of population 
exposure, and estimation of human health risks. The dispersion model 
used by HEM-3 is AERMOD, which is one of EPA's preferred models for 
assessing pollutant concentrations from industrial facilities.\1\ We 
will also perform a screening assessment of potential adverse 
environmental effects using these updated data.
---------------------------------------------------------------------------

    \1\ Environmental Protection Agency. Revision to the Guideline 
on Air Quality Models: Adoption of a Preferred General Purpose (Flat 
and Complex Terrain) Dispersion Model and Other Revisions (70 FR 
68218, November 9, 2005).
---------------------------------------------------------------------------

    We will also evaluate the NPRM data sets for each of the 22 source 
categories for potential non-inhalation human health risks, 
specifically through the presence of emissions of any persistent and 
bioaccumulative (PB) HAP, all of which are listed in Table 3 below.\2\ 
For source categories that also carry a potential for non-inhalation 
human health risks, in addition to analyses to estimate risks from 
inhalation of emissions, we will also estimate risks using refined 
models capable of addressing multi-pathway exposures (i.e., exposures 
due to ingestion or dermal exposures). The models selected for this 
exercise (primarily, we will use the EPA's Total Risk Integrated 
Modeling system, or TRIM, a refined multi-pathway pollutant fate and 
transport model) will also be used to produce estimates of pollutant 
concentrations in the surrounding environment, which will be used in 
the quantitative assessment of environmental risks from these 
chemicals. The 22 source categories are not expected to have multi-
pathway issues.
---------------------------------------------------------------------------

    \2\ Environmental Protection Agency. Air Toxics Risk Assessment 
Reference Library, Volume I. EPA-453K-04-001A. https://www.epa.gov/
ttn/fera/risk_atra_vol1.html.

                   Table 3.--Persistent and Bioaccumulative Hazardous Air Pollutants (PB HAP)
----------------------------------------------------------------------------------------------------------------
 
----------------------------------------------------------------------------------------------------------------
Cadmium compounds....................  Chlordane..............  Chlorinated dibenzodioxins and furans
DDE..................................  Heptachlor.............  Hexachlorocyclohexane (all isomers)
Hexachlorobenzene....................  Lead compounds.........  Mercury compounds
Methoxychlor.........................  Polychlorinated          Polycyclic Organic Matter (POM)
                                        biphenyls.
Toxaphene............................  Trifluralin............  ................................................
----------------------------------------------------------------------------------------------------------------

D. How will we develop proposed NESHAP to address residual risk?

    We will provide a more detailed discussion of the residual risk 
methodology in the Group 2 NPRM. Therefore, after the risk assessments 
for Group 2 are complete, the results will be examined to determine 
whether any source category meets certain criteria where the Agency 
considers the risk to not be a problem (``low risk''). The ``low risk'' 
criteria we intend to consider include: Lifetime cancer risk to the 
individual most exposed is less than 1-in-1 million, chronic non-cancer 
risk to

[[Page 14739]]

the individual most exposed is less than a target-organ-specific hazard 
index of 1, air concentrations estimated for acute exposures scenarios 
are less than health-protective reference levels, and there is no 
potential for significant and widespread adverse environmental effect.
    For Group 2 source categories in which all facilities meet these 
``low risk'' criteria, EPA will not propose further regulation under 
CAA section 112(f). For source categories that are not determined to be 
low risk, a two-step standard development process will be applied, 
consistent with CAA section 112(f) and with our previously articulated 
approach for developing NESHAP pursuant to CAA section 112(f). This 
approach was described in the final NESHAP addressing residual risk for 
coke ovens (58 FR 57898, October 27, 1993).
    In the first step of this approach, modeled source category risks 
will be evaluated to determine if they are ``acceptable.'' The term 
``acceptable,'' in reference to residual risks is not specifically 
defined in the CAA, but CAA section 112(f)(2) refers positively to the 
interpretation of this term in the Benzene NESHAP (54 FR 38044, 
September 14, 1989).
    The preamble to the Benzene NESHAP (54 FR 38044, September 14, 
1989) stated that a lifetime maximum individual excess cancer risk of 
approximately 100-in-1 million ``should ordinarily be the upper-end of 
the range of acceptability.'' However, this is not a rigid line of 
acceptability, and other factors will be considered, such as the number 
of people exposed at various risk levels, the overall incidence of 
cancer and other serious health effects, assumptions and uncertainties 
associated with the risk analysis (including the 70 year exposure 
assumption), and the weight of evidence for human health effects.
    In the second step of this standard development process, we will 
develop risk-reduction regulatory alternatives and decide upon the 
level of the standard for each source category, considering the 
requirements necessary to provide an ample margin of safety to protect 
human health, as required by CAA section 112(f)(2). To develop the 
regulatory alternatives, we will conduct various analyses, including an 
assessment of the impacts of each regulatory alternative. The impacts 
will include HAP emission reductions, other environmental impacts, 
costs, economics, small business impacts, reduction in maximum risks to 
individuals most exposed, reductions in chronic and acute risks to 
populations at various risk levels, and reductions in cancer incidence. 
We will assess these alternatives, decide upon the level of the 
standard, and publish a NPRM in the Federal Register to propose any 
regulatory changes for the individual standards codified in 40 CFR part 
63 for each source category.
    As we undertake these rulemaking proposals, we will also consider 
developments in pollution control in each source category and the costs 
of potentially stricter standards reflecting those developments, to 
fulfill the requirements of CAA section 112(d)(6). Where there have 
been developments in practices, processes, and control technologies, we 
will consider relevant factors, such as costs, potential emissions 
reductions, and health and environmental risk in a determination of 
what, if any, further controls are necessary. Where appropriate, we 
will develop regulatory alternatives, assess the impacts of those 
alternatives, and decide upon the level of the standard(s). We plan to 
propose any CAA section 112(d)(6) regulatory changes for the individual 
standards codified in 40 CFR part 63 for each source category in the 
same Federal Register notice proposing action addressing residual risk.

E. When will the NESHAP be proposed and promulgated?

    Our current goal is to propose the decisions resulting from both 
CAA section 112(f) (residual risk) and CAA section 112(d)(6) 
(technology review) efforts, including the proposal of any standards 
for each of the 21 source categories in Group 2, in the Fall of 2007. 
Proposal of any standards for the petroleum refineries source category 
will occur by the court-ordered deadline of August 22, 2007. In 
addition to proposing any new residual risk or technology-based 
standards, we will announce any decisions not to promulgate residual 
risk standards for ``low risk'' source categories or source categories 
for which the current standards protect public health with an ample 
margin of safety and any decisions not to promulgate additional 
technology-based standards.
    After the close of the comment period on the proposed standard(s), 
we will review and perform any analyses and data gathering necessary to 
address the comments, prepare responses, and make changes to the 
proposed standards, as necessary. We anticipate the final standards 
will be published in the Federal Register in the summer of 2008.

III. What is the purpose of this ANPRM?

    The primary purpose of today's ANPRM is to request public comments 
on the emissions and other model input data included in the ANPRM data 
sets for the 22 source categories included in Group 2 of the RTR Phase 
II. These data are provided in an updatable form on the RTR Web page at 
https://www.epa.gov/ttn/atw/rrisk/rtrpg.html. We provide detail in 
section VII below on how to submit updates and corrections to this 
information. Following review of comments received, we will update the 
data as appropriate, and model to generate estimates of residual risk 
that we will use as the basis for our proposed decisions on whether to 
develop standards to address residual risk for each source category.
    Section V lists the general items for which we are seeking comment 
for all source categories. In addition, we note information unique to 
each source category for which we are requesting technical corrections 
or updates in the source category specific sections within section IV 
of this ANPRM. We note that emissions data cannot be withheld from 
disclosure as CBI pursuant to section 1905 of title 18 of the United 
States Code. EPA's policy regarding the categories of information that 
it considers to be ``emissions data'' is set forth in a Federal 
Register notice dated February 14, 1991 (56 FR 7042). A copy of that 
notice has been placed in the docket.

IV. What data are in the ANPRM data sets for each source category?

    As mentioned in Section II of this ANPRM, the 2002 NEI is the 
primary data source used in creating the ANPRM data sets for each 
source category. The data extracted from the NEI for inclusion in the 
ANPRM data sets included general facility information, such as company 
name, plant name, and facility identification codes; emissions data, 
including speciated HAP emissions data; emissions release 
characteristics, including stack height, stack diameter, and the 
emissions stream exit temperature and velocity; and location 
information, including the latitude/longitude coordinates of emissions 
release locations. For more information on the 2002 NEI, please visit 
our 2002 NEI Web page at https://www.epa.gov/ttn/chief/net/
2002inventory.html.
    For the most part, the emissions values in the ANPRM data set 
represent actual emission levels. Where actual emissions data is not 
already included,

[[Page 14740]]

we request that commenters provide such data.
    Due to the high uncertainty of the dioxin/furan emissions 
information submitted during the inventory development process, dioxin/
furan emissions were not included in the 2002 NEI, and no emissions of 
these compounds are included in the ANPRM data sets. As we update the 
ANPRM data set, we will include dioxin/furan emissions, based on the 
best information available to EPA at that time. These data may include 
information EPA has gathered on dioxin and dioxin-like compounds. The 
EPA National Center for Environmental Assessment Web site, https://
cfpub.epa.gov/ncea/cfm/recordisplay.cfm?deid=159286, contains links to 
these data.
    In creating the ANPRM data sets for each source category, we 
started with the February 2006 version of the 2002 NEI. We first 
conducted a detailed review of the facilities that were included in the 
NEI and added or removed facilities to make the data as representative 
of the overall source category as possible. We then reviewed emissions, 
release characteristics, and other model input data.
    We began by retrieving all records in the 2002 NEI based solely on 
MACT source category designations, which are fields in the NEI that 
identify the MACT source category that applies to each emission point. 
This MACT source category is assigned by a variety of methods. In some 
cases, the State or local agency that provided the data to EPA 
identified the MACT category. Since State and local agencies are aware 
of the regulations that apply to facilities, we have high confidence in 
MACT category designations provided by a State or local agency. In 
other cases, EPA staff responsible for developing the MACT standards 
provided input to populate the MACT source category code fields. As 
these individuals have knowledge of the source category for which they 
are accessing and using the NEI data, the confidence in these 
designations is also high. Most of the MACT source category code 
designations, however, are assigned based on Standard Industrial 
Classification (SIC), NAICS, or Source Classification Code (SCC) 
defaults. There is often considerable uncertainty associated with these 
designations.
    One of the first things we reviewed in the NEI data was the list of 
facilities included for each source category. For some source 
categories, we are reasonably confident that we know the names of the 
facilities and their exact locations. In these cases, we compared the 
``known'' lists of facilities to the facilities in the NEI. We removed 
the MACT source category designation for facilities not on the known 
list. If facilities on the known lists were not in the data for the 
source categories, we searched the NEI for these facilities. Quite 
often, they were in the 2002 NEI, but had different, and presumably 
incorrect, MACT source category designations. These facilities were 
added to the data set for the category and the MACT source category 
codes were re-designated accordingly.
    For large facilities with multiple processes that represent 
multiple MACT source categories, it was not always straightforward to 
separate the processes by source category. In these cases, we used a 
variety of approaches to separate the processes and emission points 
into source categories. Examples of the criteria used to separate 
processes and emissions into source categories include SCC, SIC codes, 
and pollutants emitted. Situations where such source category 
separation decisions were made are highlighted in the source-category 
discussions later in this section and detailed in the files available 
for download on the RTR Web page at https://www.epa.gov/ttn/atw/rrisk/
rtrpg.html. We are asking specifically for comment on how we separated 
processes and emission points by source category at these large 
integrated facilities.
    For categories with large numbers of facilities for which we do not 
have complete lists of known facilities, we conducted more general 
evaluations of the facilities in the data sets. These evaluations 
included examining the company names, SIC, NAICS, and SCC, and adding 
or removing facilities based on these criteria.
    We will be evaluating residual risk for all facilities and emission 
sources that are in the 22 source categories included in Group 2 of the 
RTR Phase II. In some instances, the ANPRM data sets may include 
emission points that are part of the source category but are not 
subject to the MACT standard for that source category. Emissions from 
these sources will be considered in our future regulatory decisions. In 
addition, the ANPRM data sets, for most source categories, include all 
major and area sources (facilities) in the 2002 NEI that have processes 
related to the specific source category.
    After finalizing the facility lists for each source category, we 
conducted a general review of the emissions and other data included in 
the ANPRM data sets to identify data anomalies that could affect the 
risk estimates. With a few exceptions, we did not change the data or 
include additional data. For the following source categories, the 2002 
NEI was supplemented with additional data provided by industry to 
create the ANPRM data sets:
     Petroleum Refineries
     Shipbuilding and Ship Repair
     Source categories regulated by the Group I Polymers and 
Resins MACT:
    [cir] Epichlorohydrin Elastomers Production
    [cir] HypalonTM Production
    [cir] Nitrile Butadiene Rubber Production
    [cir] Polybutadiene Rubber Production
    [cir] Styrene-Butadiene Rubber and Latex Production
    The addition of these data, as well as other data changes made, are 
described in the source-category specific sections below. We note that 
because these changes are included in the ANPRM data sets, these data 
sets do not exactly match the February 2006 version of the 2002 NEI 
data available on our NEI Web site--https://www.epa.gov/ttn/chief/net/
2002inventory.html. When comments are received via this ANPRM and 
incorporated into the source category-specific ANPRM data sets, these 
revisions will then also be incorporated into the 2002 NEI and made 
publicly available through the NEI Web site in Final Version 2.1.
    Following are sections discussing the data for individual source 
categories. These discussions provide an overview of the source 
category, a brief summary of the ANPRM data sets, and a mention of the 
types of major anomalies associated with the data. Summary reports for 
each of the source categories, which contain considerable detail on the 
information summarized below, including the carcinogenic HAP and HAP 
with adverse health effects other than cancer, are available on the RTR 
Web page at https://www.epa.gov/ttn/atw/rrisk/rtrpg.html. We especially 
encourage you to review the specific anomalies raised in these reports 
and to provide data to help reduce these anomalies.
1. Mineral Wool Production
    The mineral wool production source category includes facilities 
that produce mineral wool, which is a fibrous, glassy substance made 
from natural rock (such as basalt), blast furnace slag, or other 
similar materials and consisting of silicate fibers. In the mineral 
wool manufacturing process, rock and/or blast furnace slag and other 
raw materials (e.g., gravel) are melted in a furnace (cupola) using 
coke as fuel. The molten material is then formed into fiber. Mineral 
wool is manufactured as either a ``bonded'' product that

[[Page 14741]]

incorporates a binder to increase structural rigidity or a less rigid 
``nonbonded'' product. Emission sources from mineral wool manufacturing 
facilities include the cupola furnace where the mineral charge is 
melted; a blow chamber, in which air or a binder is drawn over the 
fibers, forming them into a screen; a curing oven that bonds the fibers 
(for bonded products); and a cooling oven. The primary HAP expected to 
be emitted during the mineral wool manufacturing process are metals, 
including antimony, arsenic, beryllium, cadmium, chromium, manganese, 
nickel, lead, and selenium that are emitted from the cupola, and 
gaseous HAP, including formaldehyde, carbonyl sulfide, and phenol, that 
result from the vaporization of the binder.
    The ANPRM data set for this source category includes information 
for 12 facilities, 11 of which are classified as major sources in the 
NEI. Based on our previous estimates of the number of facilities in the 
mineral wool source category, this data set represents between 75 and 
90 percent of the industry. The HAP emitted in largest quantities from 
these facilities is carbonyl sulfide, which accounts for over 84 
percent of the total HAP emissions by mass from the data set. 
Formaldehyde, triethylamine, and phenol are also emitted in large 
quantities. Several PB HAP are reported in the data set for the mineral 
wool manufacturing source category, including lead, cadmium, and 
mercury compounds.
    The major anomalies associated with the data set for this source 
category include the HAP emitted and the speciation of chromium and 
mercury emissions. Some HAP expected (e.g., lead, manganese, cadmium, 
chromium, nickel, etc.) are not included for all the facilities in the 
data set, and some that are not expected (e.g., benzene and 
triethylamine) are reported from a few facilities.
2. Aerospace Manufacturing and Rework Facilities
    The aerospace manufacturing and rework source category includes all 
facilities that manufacture aerospace vehicles and/or vehicle 
components and all facilities that rework or repair these items. An 
aerospace vehicle or component is any fabricated, processed, or 
assembled set of parts or complete unit of any aircraft including, but 
not limited to, airplanes, helicopters, missiles, rockets, and space 
vehicles. Organic and inorganic HAP emissions in aerospace facilities 
originate from cleaning, primer application, topcoat application, paint 
stripping, chemical milling maskant application, and waste handling and 
storage. The HAP expected to be emitted by aerospace facilities include 
chromium, cadmium, methylene chloride, toluene, xylene, ethylene 
glycol, and glycol ethers. For emissions reported generically as 
``chromium'' or ``chromium and compounds,'' emissions are speciated for 
this source category as 75 percent ``chromium (III) compounds'' and 25 
percent ``chromium (VI) compounds.'' This speciation is based on source 
category-specific information provided by the aerospace industry. 
(Typically, a 66 percent ``chromium (III) compounds'' and 34 percent 
``chromium (VI) compounds'' is used as a default speciation profile 
based on the approach adopted by the 1996 National-Scale Air Toxics 
Assessment, or NATA.) We encourage commenters to review this assumption 
and provide site-specific chromium (VI) and chromium (III) data where 
possible.
    The ANPRM data set for the Aerospace Manufacturing and Rework 
source category includes information for 301 facilities, 169 of which 
are classified as major sources in the NEI. Based on our previous 
estimates of the number of facilities in the aerospace source category, 
the ANPRM data set includes data for about 10 percent of the industry. 
Methyl chloroform, tetrachloroethylene, toluene, trichloroethylene, and 
methylene chloride account for approximately 80 percent of the mass of 
HAP emitted across the 301 facilities in the ANPRM dataset.
    The major anomalies associated with the data set for this source 
category include the number of facilities in the source category, the 
HAP emitted, and the speciation of chromium. Some HAP expected to be 
reported (chromium, nickel, and hexamethylene diisocyanate) are not 
included for all the facilities in the data set.
3. Marine Tank Vessel Loading Operations
    Marine tank vessel loading operations are facilities that load and 
unload liquid commodities in bulk, such as crude oil, gasoline and 
other fuels, and some chemicals and solvent mixtures. The cargo is 
pumped from the terminal's large, above-ground storage tanks through a 
network of pipes and into a storage compartment (tank) on the vessel. 
Most marine tank vessel loading operations are associated with 
petroleum refineries, synthetic organic chemical manufacturers, or are 
independent terminals. The major HAP emission points for marine vessel 
loading operations include open tank hatches and overhead vent systems. 
Other possible emission points are hatch covers or domes, pressure-
vacuum relief valves, seals, and vents. Emissions may also occur during 
ballasting (i.e., the process of drawing ballast as water into a cargo 
hold). The primary HAP expected to be emitted from marine vessel 
loading operations depend on the material being loaded, but are 
generally expected to be benzene, hexane, toluene, xylene compounds, 
ethyl benzene, and cumene.
    The ANPRM data set for the marine tank vessel loading operations 
source category includes information for 126 facilities, all of which 
are classified as major sources in the NEI. Based on our previous 
estimates of the number of facilities in this source category, the 
ANPRM data set includes data for more than were expected to be subject 
to the MACT (which was estimated to be 40 at time of the MACT 
promulgation) and less than the estimated number of existing facilities 
based on Army Corps of Engineers estimates (700). In the ANPRM data 
set, the HAP emitted in largest quantities from these 126 sources are 
hexane, methanol, toluene, xylene compounds, and benzene, which 
collectively accounts for nearly 75 percent of the total HAP emitted.
    The major anomalies associated with the data set for this source 
category include the number of facilities in the source category and 
the emission release parameters (of which nearly all are NEI default 
values).
4. Natural Gas Transmission and Storage
    The natural gas transmission and storage source category comprises 
the pipelines, facilities, and equipment used to transport and store 
natural gas products (hydrocarbon liquids and gases). Pipeline 
transport of natural gas products is covered by this category to either 
the point of custody transfer for the oil and natural gas production 
source category or the point of delivery to the local distribution 
company or final end user of the natural gas if no local distribution 
company is present. Emissions of HAP from the natural gas transmission 
and storage category come from glycol dehydration unit reboiler vents, 
other process vents, storage vessels with flash emissions, pipeline 
pigging and storage of pipeline pigging wastes, combustion sources, and 
equipment leaks. The major HAP expected to be emitted by the natural 
gas transmission and storage source category are hexane, toluene, 
benzene, mixed xylenes, formaldehyde, and glycol ethers.

[[Page 14742]]

    Our previous estimates identified seven natural gas transmission 
and storage facilities that were major sources. The ANPRM data set for 
the natural gas transmission and storage source category includes 
information for 123 facilities, 78 of which are classified as major 
sources in the NEI. In the ANPRM data set, the HAP emitted in largest 
quantities from natural gas transmission and storage facilities are 
hexane, toluene, benzene, and mixed xylenes and these emissions 
collectively account for over 75 percent of the total HAP emissions 
from this source category.
    One major anomaly associated with the data set for this source 
category is the number of facilities identified in the ANPRM data set 
compared to the number of facilities previously identified for this 
source category (i.e., there appear to be more facilities identified as 
natural gas transmission and storage facilities in the ANPRM data set 
than previously identified).
5. Oil and Natural Gas Production
    The Oil and Natural Gas Production source category includes 
facilities involved in the recovery and treatment of hydrocarbon 
liquids and gases from oil and natural gas production wells. Components 
of these facilities include glycol dehydration units, condensate tank 
batteries, and other tanks and equipment present at natural gas 
processing plants. The primary HAP emissions from oil and natural gas 
production facilities occur via the glycol dehydration reboiler vents, 
other process vents, storage vessels, and equipment leaks. The major 
HAP expected to be emitted by the oil and natural gas production source 
category are xylenes, toluene, hexane, and ethyl benzene.
    The ANPRM data set for the oil and natural gas production source 
category includes information for 2,824 facilities, of which 909 
facilities are classified as major sources in the NEI. Our previous 
estimates identified 440 major sources and 2,200 area sources. In the 
ANPRM data set, the HAP emitted in the greatest amounts are carbonyl 
sulfide, hexane, toluene, benzene, and xylenes formaldehyde, ethyl 
benzene, ethylene glycol, and methanol. These HAP collectively account 
for over 99 percent of the total HAP emissions for this source 
category. There are twelve PB HAP reported in the data set for the Oil 
and Natural Gas Production source category, including polycyclic 
aromatic hydrocarbons (PAH), lead, dibenzofuran, and cadmium.
    For reported emissions of POM chemicals, emissions are grouped into 
one of seven POM categories--POM 71002 (16-PAH, PAH total, POM); POM 
72002 (2-Chloronaphthalene, 2-Methylnaphthalene, Acenaphthene, 
Acenaphthylene, Anthracene, Benzo(c)phenanthrene, Benzo[e]Pyrene, 
Benzo[g,h,i,]Perylene, Fluoranthene, Fluorene, Perylene, Phenanthrene, 
Pyrene); POM 73002 (7,12-Dimethylbenz[a]Anthracene); POM 74002 (3-
Methylcholanthrene); POM 75002 (5-Methylchrysene, Benzo[a]Pyrene, 
Dibenzo[a,h]Anthracene); POM 76002 (B[j]Fluoranthen, Benz[a]Anthracene, 
Benzo[b]Fluoranthene, Benzo[k]Fluoranthene, Indeno[1,2,3-c,d]Pyrene); 
and POM 77002 (Chrysene). We encourage commenters to provide data on 
the individual chemical(s) that make up the POM.
    The major anomalies associated with the data set for this source 
category include the number of facilities in the source category, the 
specific HAP emitted by individual facilities, and default plant 
coordinates. The ANPRM data set contains over 2,800 facilities and this 
number is more than expected. The ANPRM data set also contains 
emissions of some HAP that are expected to be emitted from all 
facilities in the category (e.g., xylenes, hexane, toluene, and ethyl 
benzene), but are only emitted from a small percentage of facilities. 
Conversely, the HAP with the largest quantity of emissions in the ANPRM 
data set, carbonyl sulfide, is not expected to be emitted from 
facilities in this source category. In addition, a significant 
percentage (40 percent) of the coordinates in the ANPRM data set are 
default coordinates.
6. Petroleum Refineries
    Petroleum refineries are facilities engaged in refining and 
producing products made from crude oil or unfinished petroleum 
derivatives. EPA listed two separate Petroleum Refinery source 
categories, both of which include any facility engaged in producing 
gasoline, naphtha, kerosene, jet fuels, distillate fuel oils, residual 
fuel oils, lubricants, or other products from crude oil or unfinished 
petroleum derivatives. The Petroleum Refineries--Catalytic Cracking 
(Fluid and Other) Units, Catalytic Reforming Units, and Sulfur Plant 
Units source category includes the following process units: catalytic 
cracking (fluid and other) units, catalytic reforming units, and sulfur 
plant units (MACT II). The second source category, Petroleum 
Refineries--Other Sources Not Distinctly Listed, includes the process 
units not listed in the first category including, but not limited to, 
thermal cracking, vacuum distillation, crude distillation, 
hydrotreating, hydrorefining, isomerization, polymerization, lube oil 
processing, and hydrogen production (MACT I).
    Because the MACT standard for the ``Other Sources Not Distinctly 
Listed'' source category (40 CFR part 63, subpart UU) was promulgated 
first (60 FR 43244, August 18, 1995), it is commonly referred to as 
Petroleum Refineries MACT I. Only the units in the ``Other Sources Not 
Distinctly Listed'' category, and regulated by the MACT 1 standards, 
are being addressed in RTR Phase II. These units include emissions 
sources classified