Technical SupportDocument (TSD) for Emissions Inventories for the Huntington-Ashland 1997 PM2
.5RedesignationRequest andMaintenancePlan

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 ofAirMonitoring and Analysis (3AP40)

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### I. Introduction
The purpose ofthis document is to provide a technical summary ofthe Office ifAir Monitoring and Analysis (OAMA) review ofthe emissions inventories submitted with the Redesignation Request and Maintenance Plan for the West Virginia Portion ofthe Huntington-Ashland, WVKY-OH 1997 PM2
. 5 Nonattainment Areabythe West Virginia Department ofthe Environment (WVDEP). This review does not determine the approvability ofthe 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 ofAir Monitoring and Analysis, at 215- 814-2150 or via email at wilkie.walter@epa.gov.


### II. Emissions Inventories for Maintenance Plan
2008Attainment Year Inventory andMaintenance Plan Base Year Inventory
The inventoryused for the year ofattainment 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 primaryPM2

.s emissions (including condensibles), S02 and NOx and VOC and NH3 ifthey 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, EGUMountaineer, Spoms, and the Non-EGU New Haven Plant are included inthe inventory. EPA guidance for emissions inventory development provides that actual emissions should be used for purposes ofthe base year inventory. WVDEP used WV Department ofAir 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 bythe EPA.
The 2008 Onroad Mobile source inventory was developed using the most current version ofEPA'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 bythe KYOVA 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 MOVES2010amodel was provided by Ohio Department ofTransportation (ODOT), Ohio EPA, West VirginiaDepartment ofTransportation (WVDOT), WVDEP, Kentucky Transportation Cabinet (KYTC) and the Kentucky Division ofAir Quality (KDAQ). The mobile emissions inventory was prepared byKimley-Hom and Associates Inc, and was summarized bypollutant type and given in units oftons per year. 2015 and2022Projection 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 VisibilityImprovement State and Tribal Association ofthe Southeast (VISTAS)/ Association ofSoutheastern IntegratedPlanning (ASIP) modeling inventory.
WVDEP developed the 2015 Point source inventorybyinterpolationbetween 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. ForEGUs, 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 staffused 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 stationarypoint sources. Additionally, VISTAS incorporated more up-to-date growth factors inEGAS 4.0 as documented inthe reports entitled Development of Growth Factorsfor Future Year ModelingInventories (dated April30, 2004) and CAIR Emission Inventory Overview (dated July 23, 2004). OAMA staffhas reviewed the VISTAS documentation providedbyWVDEP 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 byEPA 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 inthe 2022 inventory were held constant at 2018 levels because no further reduction in fuel sulfur content is expected. All otherNonroad 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 staffreviewed the files and the emission results provided byWVDEP and found them to be approvable.

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