Technical Support Document (TSD) Charleston West Virginia 

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

Submitted November 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

____________________/s/________________________

Reviewed by Walter Wilkie, Associate Director

Office of Air Monitoring and Analysis, 3AP40

_______August 12, 2010__________

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 of the Base Year emissions inventories 

submitted with the Charleston, West Virginia PM2.5 SIP by the West Virginia 

Department of the Environmental Protection (WVDEP). This review determines the 

approvability of the SIP Base Year Inventory and an evaluation 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 

Charleston area, comprised of Kanawha and Putnam 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, SO2 and 

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

In the Charleston 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 is one EGU source in Kanawha County, and one EGU 

source in Putnam County. 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 

second step was to develop emissions that were not contained in the NONROAD Model. 

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

 

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
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, SO2, 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.