Federal Register: January 14, 2014 (Volume 79, Number 9)
DOCID: FR Doc 2014-00564
ENVIRONMENTAL PROTECTION AGENCY
ENVIRONMENTAL PROTECTION AGENCY
FR ID: [FR Doc No: 2014-00564]
EPA ID: [EPA-HQ-OAR-2013-0809; FRL-9905- 43-OAR]
DOCUMENT ACTION: Notice of data availability (NODA).
DATES: Comments must be received on or before June 30, 2014. Please refer to SUPPLEMENTARY INFORMATION for additional information on submitting comments and on the provided data.
The Environmental Protection Agency (EPA) is providing notice that the 2018 Emissions Modeling Platform data are available for public review and comment. The 2018 Emissions Modeling Platform consists of emission inventory data, supporting data used to develop the 2018 emission inventories, and methods and data that are used to process emission inventories representing the year 2018 into a form that can be used for air quality modeling. The platform, or portions of the data that make up the platform, may be used by the Office of Air and Radiation in several contexts, including the development of rules related to the transport of air pollution and the National Ambient Air Quality Standards. The EPA is requesting comment on the 2018 Emissions Modeling Platform, including the emission inventories, the supporting data, and the methods used to develop and process the 2018 emission inventories. A docket has been established to facilitate public review of the data and to track comments.
s 2018 Emissions Modeling Platform
DOCUMENT BODY 2:
The EPA is requesting comment on the 2018
platform emission inventories; supporting ancillary files used to
allocate emissions temporally, spatially, and by species; and on the
emissions modeling methods used to develop the 2018 emission
inventories, including but not restricted to, the projection, control
and closure data, activity data, and model input databases used to
develop projected emission levels in 2018. Summaries of the emission
inventories and data are provided to aid in the review of the data, but
comments are sought on the actual inventories, model inputs, and data used to develop the projected 2018 emissions.
I. Additional Information on Submitting Comments
A. What should I consider as I prepare my comments for EPA?
1. Submitting CBI. Do not submit this information to the EPA through EDOCKET, www.regulations.gov, or email. Clearly mark the part or all of the information that you claim to be CBI. For CBI information in a disk or CDROM that you mail to the EPA docket office specified in the Instructions, mark the outside of the disk or CDROM as CBI and then identify electronically within the disk or CDROM the specific information that is claimed as CBI. Information so marked will not be disclosed except in accordance with procedures set forth in 40 CFR part 2. 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.
2. Tips for preparing your comments. When submitting comments, remember to:
i. Identify the notification by docket number and other identifying information (subject heading, Federal Register date and page number).
ii. Explain your comments, why you agree or disagree; suggest alternatives and substitute data that reflect your requested changes.
iii. Describe any assumptions and provide any technical information and/or data that you used.
iv. Provide specific examples to illustrate your concerns, and suggest alternatives.
v. Explain your views as clearly as possible, avoiding the use of profanity or personal threats.
vi. Make sure to submit your comments by the comment period deadline identified.
B. Instructions for Submitting Comments and Alternative Data
The EPA can most effectively use comments on data that provide specific alternative values to those in the EPA data sets, and for which accompanying documentation supports the alternative values. Commenters should provide the alternative data at a level of detail appropriate to the data set into which it will be incorporated, thereby including all key fields needed to substitute the old data with the new. For example, any data provided as an alternative to EPA's point source emissions data should include all key fields used to identify point source data such as facility, unit, release point, process, and pollutant, along with alternative emissions values. If a commenter were to provide a new set of county total emissions as an alternative to detailed point source emissions data, the EPA would be unable to use the new data. Commenters should also include documentation that describes methods for development of any alternative values and relevant references supporting the alternative approach.
Any alternative emission inventory or ancillary data provided should be compatible with the formats used by the Sparse Matrix Operator Kernel Emissions (SMOKE) modeling system version 3.5.1, which is used by the EPA to process emission inventories into a format that can be used for air quality modeling. Formats are defined in the SMOKE Version 3.5.1 User's Manual available from http://www.smokemodel.org. Only the rows of data that have changed from those provided by the EPA should be included in the alternative data sets. Alternative data that are not an input to SMOKE, such as model input databases for mobile source models, should be provided in a format in which it could be directly input to the model.
To comment on inventory projection methods, submit comments to the docket that describe an alternative approach to the existing methods, along with documentation describing why that method is an improvement over the existing method.
II. Information Available for Public Comment
The 2018 Emissions Modeling Platform consists of emission inventories that represent projected emissions into the atmosphere of criteria and some hazardous air pollutants in the year 2018, additional ancillary data files that are used to convert the National Emissions Inventory (NEI) emissions into a form that can be used for air quality modeling, and methods used to prepare the air quality model inputs and to develop projections of emissions in the year 2018. The platform includes emission inventories for sources at specific locations called point sources; emissions from fire events; and countylevel emissions of onroad mobile sources, nonroad mobile sources, and other nonpoint sources.
In the modeling platform, emission sources are split into categories called modeling sectors. For example, locationspecific point emission sources are split into peaking electric generating units (EGUs), other EGUs, oil and gas point sources, and other point sources. Nonpoint emission sources are split into agricultural ammonia sources, residential wood sources, oil and gas nonpoint sources, and other nonpoint sources.
The 2018 emissions modeling platform is named for the year of the data that it represents. The emission inventories in the 2018 modeling platform have been developed using projection methods that are specific to the type of emission source. Emission projections for EGUs for 2018 are developed using the Integrated Planning Model (IPM), which is further described below. Most nonEGU source emissions are projected based on the EPA's 2011 emissions modeling platform, which the EPA has also made available for public comment under a November 27, 2013, Federal Register notice titled 2011 Emissions Modeling Platform; Availability. The relevant 2011 data files are available in docket number EPAHQOAR20130743. Future emissions are projected from this base case either by running models to estimate emissions in the future year (i.e., EGUs, and onroad and nonroad mobile sources), or by adjusting the base year emissions according to the best estimate of changes expected to occur in the intervening years (i.e., nonEGU point and nonpoint sources).
For some sectors, the same emissions are used in the base and future years, such as biogenic emissions, point source fire emissions, and Canadian emissions. For all other sectors, rules and specific legal obligations that go into effect in the intervening years, along with changes in activity for the sector, are considered when possible. Documentation of the methods used for each sector is provided in the Technical Support Document Preparation of Emissions Inventories for the Version 6.0, 2011 Emissions Modeling Platform, which can be found in the docket for this notice.
In order to project future EGU emissions, the EPA uses the IPM. The National Electric Energy Data System (NEEDS) database contains the generation unit records used for the model plants that represent existing and planned/committed units in the EPA modeling applications of IPM. NEEDS includes basic geographic, operating, air emissions, and other data on these generating units and was completely updated for the EPA's new power sector modeling platform. The EGU emission projections included in this 2018 emissions modeling platform are reported in an air quality modelingready flat file taken from EPA Base Case v.5.13, developed using IPM. 2018 EGU emission projections in the flat file format, the corresponding NEEDS database, and user guides and documentation are available in the docket for this notice, and they are also available on the Internet at http://www.epa.gov/powersectormodeling.
To project future emissions from onroad and nonroad mobile sources, the EPA uses MOVES and the National Mobile Inventory Model (NMIM), respectively. The 2018 projections were obtained by running these models to represent the year 2018 using yearspecific information about fuel mixtures, activity data, and the impacts of national and state level rules and control programs. The mobile model input databases and future year activity data are provided at http://www.epa.gov/ttn/chief/emch/index.html#2011.
For nonEGU point and nonpoint sources, projections of 2018 emissions are developed by starting with the emissions inventories in the 2011 emissions modeling platform and applying adjustments that represent the impact of rules coming into effect in the years 2012 through 2018, along with the impacts of planned shutdowns, the construction of new plants, specific information provided by states, and specific legal obligations, such as consent decrees resolving alleged environmental violations. Changes in activity are considered for sectors such as oil and gas, residential wood combustion, cement kilns, livestock, aircraft, commercial marine vessels and trains. Data files used to represent the changes due to national, state and local rules as well as other specific legal obligations, are provided along with summaries that quantify the emission changes resulting from each program at a state and nationallevel.
The 2018 Emissions Modeling Platform also includes 2006 emissions [[Page 2440]]
inventories for Canada and projected 2018 emissions inventories for Mexico, along with ancillary data files used to allocate annual emissions to the hourly, gridded emissions of chemical species used by an air quality model (AQM). The types of ancillary data files include temporal profiles that allocate annual and monthly emissions down to days and hours, spatial surrogates that allocate countylevel emissions onto the grid cells used by an AQM, and speciation profiles that allocate the pollutants in the NEI to the chemical species used by an AQM. In addition, there are temporal, spatial, and speciation cross reference files that map the emission sources in the emission inventories to the appropriate profiles based on their location, emissions source classification code (SCC), and in some cases the specific facility or unit. With the exception of some speciation profiles, the ancillary data files are unchanged from the data files associated with the 2011 emissions modeling platform. The EPA provided an opportunity for comment on the data files for the 2011 platform in a notice published on November 27, 2013, and those files are available in docket number EPAHQOAR20130743.
The 2018 emissions modeling platform, or portions of the data that make up the platform, may be used by the Office of Air and Radiation in several contexts including the development of rules related to the transport of air pollution and the National Ambient Air Quality Standards. Air quality modeling results that are based on the outputs of the emissions modeling platform are typically used in support of Regulatory Impact Analyses (RIAs) and sometimes support other aspects of rulemaking efforts.
The EPA has placed key information related to the 2018 Emissions Modeling Platform into the electronic docket available at
www.regulations.gov. However, many of the detailed data files are too large to be directly uploaded into the electronic docket and/or are not in formats accepted by that docket. Therefore, the information placed in the electronic docket, associated detailed data, and summaries to help with interpretation of the data are available for public review on the EPA's Clearinghouse for Inventories and Emissions Factors (CHIEF) Web site at http://www.epa.gov/ttn/chief/emch/index.html#2011.
The emissions inventories, along with many of the ancillary files,
are provided in the form of flat files that can be input to SMOKE. Flat
files are commaseparated value style text files with columns and rows
that can be loaded into spreadsheet or database software. The columns
of interest in the emission inventory files are specified in each
subsection below. The EPA requests comment on the following components of the 2018 emissions modeling platform data:
implementation of consent decrees and other programs.
improve the temporal allocation of emissions data.
To aid in the interpretation of the provided data files and how
they relate to the aspects of the data on which the EPA is requesting
comment, the EPA has provided in the docket a document describing the information included in the data files.
Dated: January 8, 2014.
Mary E. Henigin,
Director, Office of Air Quality Planning and Standards.
[FR Doc. 201400564 Filed 11314; 8:45 am]
BILLING CODE 656050P
FOR FURTHER INFORMATION CONTACT
For questions on the 2018 Emissions Modeling Platform and on how to submit comments, contact Alison Eyth, Air Quality Assessment Division, Environmental Protection Agency, C339 02, 109 T.W. Alexander Drive, Research Triangle Park, NC 27709; telephone number: (919) 5412478; fax number: (919) 5410684; email address: firstname.lastname@example.org.