Technical Support Document (TSD) for West Virginia's Portion of the 

Weirton-Steubenville WV-OH Nonattainment Area's 

PM2.5 State Implementation Plan (SIP) Base Year Inventory 

Submitted June 2009 by the West Virginia 

Department of Environmental Protection 

TSD Prepared July 2010 by 

Alice H. Chow 

Office of Air Monitoring and Analysis, 3AP40 

U.S. Environmental Protection Agency, Region 3 

1650 Arch Street 

Philadelphia, Pennsylvania 19103 

Reviewed by alter Wilkie, Associate Director 

Office of Air Monitoring and Analysis, 3AP40 

~f2,Wtv Date Signed 
I. Introduction 

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

Air Monitoring and Analysis (OAMA) review ofthe Base Year emissions inventories 

submitted with West Virginia's portion of the Weirton-Steubenville Nonattainment 

Area's (Weirton area) PM2.5 SIP by the West Virginia Department of the Environmental 

Protection (WVDEP). This review determines the approvability ofthe SIP Base Year 

Inventory and an evalJation of the methods used. A SIP Base Year Inventory is the 

starting point from which other SIP inventories are derived as well as serving as the 

benchmark for other SIP planning activities, such as the establishment of an emissions 

reduction credit program. On January 5, 2005 the West Virginia's portion of the 

Weirton-Steubenville's nomittainment area, comprised of Brooke and Hancock Counties, 

was designated as nonattainment for the PM2.5 NAAQS. Any questions pertaining to this 

technical summary should be directed to Walter K. Wilkie, Associate Director, Office of 

Air Monitoring and Analysis, at 215-814-2150 or via email at wilkie.walter@epa.gov. 

II. 2002 SIP Base Year Inventory 

The SIP base year inventory is .the primary inventory from which other 

inventories (3-year cycle inventories, reasonable further progress inventories, modeling 

inventories) are derived. The Clean Air Act calls for State, local, and Tribal agencies to 

ensure that the base year inventory is comprehensive, accurate, and current for all actual 

emissions. 1 The base year inventory includes emissions estimates from stationary point 

and nonpoint sources, onroad mobile sources, and nonroad mobile sources. For the 

PM2.5 NAAQS, the pollutants to be inventoried are PM 10, PM2.5, VOC, NOx, S02 and 

NH3. For the NAAQS, emissions should be reported as actual annual emissions. 

In the Weirton area SIP the base year used was 2002. WVDEP provided a point 

source inventory for 2002 that contained emissions for electric generating units (EGUs) 

and Non-EGU sources. There are two EGU sources in the Weirton area. For EGUs and 

Non-EGUs WVDEP supplied data to EPA's National Emissions Inventory (NEI) for 

2002, as required by the Consolidated Emissions Reporting Rule (CERR). West Virginia 

submitted filterable PM emissions that were augmented by MACTEC for VISTAS to 

develop primary PM estimates. 

For the 2002 area source emissions, WVDEP used 2002 NEI data developed by 

the EPA as the starting point for the area source inventory. West Virginia updated 

estimates for the Residential Fuel/Wood Combustion categories for coal, distillate oil, 

natural gas, and wood from the 2002 preliminary NEI file. NH3 emissions estimates were 

calculated using the Carnegie Mellon University NH3 model. 

WVDEP used a two step process to develop the Nonroad Mobile source inventory 

used in this request. First the emissions for the nonroad source categories that are 

included in EPA's NONROAD2005 Model (NONROAD) were developed. NONROAD 

estimates fuel consumption and emissions of total hydrocarbons, carbon monoxide, 

nitrogen oxides, sulfur dioxide, and particulate matter for all nonroad mobile source 

categories except for aircraft; locomotives, and commercial marine vessels (CMV). The 

1 "Emissions Inventory Guidance for Implementation of Ozone and Particulate Matter National Ambient 

Air Quality Standards (NAAQS) and Regional Haze Regulations." EPA-454/R-05-001 , August 2005 
second step was to develop emissions that were not contained in the NONROAD Model. 

Aircraft, locomotives, and commercial marine vessels (CMV) emission estimates 

submitted by WVDEP were developed by E.H. Pechan and AssoCiates for VISTAS. 

OAMA staff reviewed the documentation provided concerning this portion of the 

Nonroad inventory and believes that it is reasonable to use these emission estimates. 

The MOBILE6 module of the SMOKE model was used to develop the onroad 

mobile source emissions estimates for NOx, NH3, S02, PM, and VOC emissions. 

MOBILE 6.2 defaults were used for the speed, vehicle age and vehicle mix data. The 

2002 vehicle miles traveled (VMT) was obtained from the West Virginia Department of 

Transportation (WVDOT) and provided along with West Virginia-specific temperature 

data. Mobile emissions values were given annually by SCC. AQAB staff reviewed the 

files and emission results.