Technical Support Document (TSD) for 

Emissions Inventories for the Huntington-Ashland 

1997 PM2.

5 Redesignation Request and Maintenance Plan 

Submitted June 2011 by the West Virginia 

Department of Environmental Protection 

TSD Prepared April2012 by 

Jessica L. Fry 

Office of Air Monitoring and Analysis, 3AP40 

U.S. Environmental Protection Agency, Region 3 

1650 Arch Street 

Philadelphia, Pem1sylvania 19103 

Reviewed by Walter Wilkie, Associate Director 

Office of Air Monitoring and Analysis (3AP40) 

! 9 Ut ~ li'Date Sigrfed 
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I. Introduction 

The purpose of this document is to provide a technical summary of the Office if Air Monitoring 

and Analysis (OAMA) review of the emissions inventories submitted with the Redesignation 

Request and Maintenance Plan for the West Virginia Portion of the Huntington-Ashland, WVKY-OH 1997 PM2.

5 Nonattainment Area by the West Virginia Department of the Environment 

(WVDEP). This review does not determine the approvability of the redesignation request or 

maintenance plan. In a maintenance plan, the emissions inventories are use to reflect the 

emissions during the time the area came into attainment and are then projected to show that the 

area will remain in attainment. Any questions pertaining to this technical summary should be 

directed to Walter Wilkie, Associate Director, Office of Air Monitoring and Analysis, at 215-

814-2150 or via email at wilkie.walter@epa.gov. 

II. Emissions Inventories for Maintenance Plan 

2008 Attainment Year Inventory and Maintenance Plan Base Year Inventory 

The inventory used for the year of attainment is called the Attainment Year Inventory 

and also is referred to as the Maintenance Plan Base Year Inventory. This inventory is used as 

the basis for the projected inventories that are used to show the area will remain in attainment. 

The base year inventory contains primary PM2.s emissions (including condensibles), S02 and 

NOx and VOC and NH3 if they are determined to be significant for all counties in the 

Nonattainment Area, for all source categories, which includes Point, Nonpoint, Onroad mobile, 

and Nonroad mobile. This section will discuss the 2008 Attainment Year Inventory that was used 

in the Huntington-Ashland Redesignation Request and Maintenance Plan submitted by WVDEP. 

WVDEP compiled a 2008 Point source inventory for the Huntington-Ashland 

Redesignation Request and Maintenance Plan. The 2008 point source inventory contained 

emissions for electric generating units (EGUs) and Non-EGU sources in Cabell and Wayne 

Counties. For the partial Mason County, EGU Mountaineer, Spoms, and the Non-EGU New 

Haven Plant are included in the inventory. EPA guidance for emissions inventory development 

provides that actual emissions should be used for purposes of the base year inventory. WVDEP 

used WV Department of Air Quality's (DAQ) 2008 annual emissions inventory database and 

EPA's Clean Air Markets Division (CAMD) database to compile their inventory. 

For the 2008 Area and Nonroad Mobile source emissions, WVDEP used 2008 NEI vl.5 

data developed by the EPA. 

The 2008 Onroad Mobile source inventory was developed using the most current version 

of EPA's highway mobile source emissions model MOVES2010a. WVDEP used the Kentucky, 

Ohio, and West Virginia (KYOVA) Travel Demand Model, which is the most recent travel 

demand model provided by the KYOV A Interstate Planning Commission which covers the 

nonattainment counties in WV. Information from the travel demand models combined with 

Highway Performance Monitoring Systems (HPMS) county-level data from each area were used 

in the emissions analysis. Any additional data needed for input into the MOVES2010a model 

was provided by Ohio Department ofTransportation (ODOT), Ohio EPA, West Virginia 

Department of Transportation (WVDOT), WVDEP, Kentucky Transportation Cabinet (KYTC) 

and the Kentucky Division of Air Quality (KDAQ). The mobile emissions inventory was 

prepared by Kimley-Hom and Associates Inc, and was summarized by pollutant type and given 

in units of tons per year. 

2015 and 2022 Projection Emission Inventories 

Projection inventories are used to show that the area will remain in attainment. WVDEP 

used 2015 and 2022 emission projections for the interim and maintenance plan end year, 

respectively. The projection inventories for the 2015 and 2022 Point, Area and Nonroad sources 

were based on the 2012 and 2018 Visibility Improvement State and Tribal Association of the 

Southeast (VISTAS)/ Association of Southeastern Integrated Planning (ASIP) modeling 

inventory. 

WVDEP developed the 2015 Point source inventory by interpolation between the 

VISTAS/ ASIP 2012 and 2018 inventory. The 2022 EGU inventory for PM2.5, NOx, and SOz was 

kept the same as the VISTAS/ASIP 2018 inventory. The 2022 Non-EGU inventory was 

extrapolated from the 2012 and 2018 inventory. Point source emissions for 2012 and 2018 were 

developed for EGUs and Non-EGUs. For EGUs, WVDEP used the projection inventory 

developed byVISTAS/ASIP. VISTAS/ASIP analysis was based on the EPA's IPM model; 

VISTAS/ASIP contractors projected future year emissions for EGUs under several scenarios 

based on the best information available at the time. WV DEP staff used the "On the way" 

(OTW) projections, which took into account reductions required by CAIR, as a basis for 2012 

and 2018 EGU emissions. VISTAS/ASIP contractors used EPA's EGAS, Version 4.0 to 

perform the projections for non-EGU stationary point sources. Additionally, VISTAS 

incorporated more up-to-date growth factors in EGAS 4.0 as documented in the reports entitled 

Development of Growth Factors for Future Year Modeling Inventories (dated April30, 2004) 

and CAIR Emission Inventory Overview (dated July 23, 2004). OAMA staff has reviewed the 

VISTAS documentation provided by WVDEP and found these methodologies acceptable. 

Area source emissions for 2015 were interpolated from the VISTAS/ASIP 2012 and 2018 

inventory. The 2022 emissions were extrapolated from the VISTAS/ASIP 2012 and 2018 

inventory. Growth and controls for emissions were based on the methodologies applied by EPA 

for the CAIR analysis. 

Nonroad source emissions including aircraft, locomotives, and commercial marine vessels 

(CMV) for 2015 were interpolated from the VISTAS/ASIP 2012 and 2018 inventory. CMV 

source emissions for S02 included in the 2022 inventory were held constant at 2018 levels 

because no further reduction in fuel sulfur content is expected. All other Nonroad source 

emissions for 2022 were extrapolated from the VISTAS/ASIP 2012 and 2018 inventory 

The 2015 and 2022 Onroad mobile source emissions were prepared by Kimley-Hom and 

Associates Inc, using MOVES2010a following the same procedures as the 2008 inventory. 

OAMA staff reviewed the files and the emission results provided by WVDEP and found them to 

be approvable. 
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