Technical Support Document (TSD) For 

Liberty-Clairton PM 2.5 Nonattainment Area:

State Implementation Plan (SIP) Attainment Demonstration

and Base Year Inventory

Submitted April 2011 by the Pennsylvania 

Department of Environmental Protection 

TSD Prepared October 2011 by

Jessica Fry

Office of Air Monitoring and Analysis, 3AP40

U.S. Environmental Protection Agency, Region 3

1650 Arch Street

Philadelphia, Pennsylvania 19103

/s/

____________________________________________

Reviewed by Andrew Hass, Acting Associate Director

Office of Air Monitoring and Analysis (3AP40)

October 5, 2011

_______________

Date Signed

        

Introduction

The purpose of this document is to provide a technical summary of the
Office of Air Monitoring and Analysis (OAMA) review of the emissions
inventories submitted with the Liberty-Clairton PM 2.5 Nonattainment
Area State Implementation Plan (SIP) by the Allegheny County Health
Department (ACHD).  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 Liberty-Clairton area, located in
Allegheny County and comprised of the boroughs of Glassport, Liberty,
Lincoln, Port Vue, and the city of Clairton was designated as
nonattainment for the PM2.5 NAAQS. Any questions pertaining to this
technical summary should be directed to Andrew Hass, Acting Associate
Director, Office of Air Monitoring and Analysis, at 215-814-2049 or via
email at  HYPERLINK "mailto:hass.andrew@epa.gov" hass.andrew@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.  The base year inventory includes emissions estimates from
stationary point and nonpoint sources, nonroad mobile sources, and
onroad 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 Liberty-Clairton area SIP the base year used was 2002.  ACHD
provided a point source inventory developed by the
Mid-Atlantic/Northeast Visibility Union (MANE-VU) that contained
emissions for five facilities in the nonattainment area.  These
stationary point sources included two major sources, two “synthetic
minor” sources, and one minor source.  ACHD made corrections to the
point source inventory which involved the addition of condensable PM
emissions for EGUs based on stack tests and revised emission factors.

	For the 2002 Nonpoint Source emissions, also known as “area
sources,” ACHD provided an inventory developed by MANE-VU that
contained estimations of emissions by multiplying an emission factor by
some known indicator or activity level for each category at the county
level.  These emissions are typically calculated on an annual basis
because the activity data are generally only available on an annual
basis.  Nonpoint source estimates were provided by SCC and were
apportioned to the Liberty-Clairton area based on population counts.

	The Nonroad Mobile Source 2002 inventory was prepared with EPA’s
NONROAD2005 model.  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.  The National
Mobile Inventory Model (NMIM) was used to estimate emissions of ammonia
from sources contained in the NONROAD model.   PADEP provided emission
estimates for locomotive engines, aircraft emissions, and commercial
marine vessels (CMV) emissions separately.  The emissions submitted were
developed by E.H. Pechan and Associates for MANE-VU.  All Nonroad mobile
source emissions were provided by SCC and classification and were
apportioned to the Liberty-Clairton area based on population.

	The Onroad Mobile Source 2002 emissions inventory was developed using
EPA’s highway mobile source emissions model MOBILE 6.2. The data was
compiled by PA DEP for Southwestern PA, with a separate estimate done
for the Liberty-Clairton area.  PADEP also used PPSUITE, an enhanced
version of the Post Processor for Air Quality software systems used for
previous inventory submissions in Pennsylvania.  The Pennsylvania
Department of Transportation (PennDOT) provided estimates of vehicle
miles traveled (VMT) by vehicle type and roadway type.  The mobile
source VMT and emissions for the Liberty-Clairton area were estimated
using GIS and the PennDOT Roadway Management System (RMS).

OAMA staff reviewed the files and the emission results provided by ACHD
and found them to be approvable.

 “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, updated
November 2005.

