Technical Support Document (TSD) For Pittsburgh

- Beaver Valley PM 2.5 Nonattainment Area: State Implementation Plan (SIP) Attainment Demonstration

and Base Year Inventory

Submitted November 2009 by the Pennsylvania Department of Environmental Pr otection

TSD Prepared July 2010 by

Alice H. Chow Air Quality Analysis Branch, 3AP 40 U.S. Environmental Protection Agency, Region 3

1650 Arch Street Philadelphia, Pennsylvania 19103

_____________________ /s/

_______________________ Reviewed by Walter Wilk ie, Director Office of Air Monitoring and Analysis (3AP40)

_______ August 12, 2010

__________

Dat e SignedI. Introduction

The purpose of this document is to provide a technical summary of the Office if Air Monitoring and Analysis (OAMA) review of t he emissions inventories submitted

with the Pittsburgh

- Beaver Valley PM 2.5 Nonattainment Area State Implementation Plan (SIP) by the Pennsylvania Department of Environment al Protection (PADEP) . This review determines the approvability of the SIP Base Yea r 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 emission s reduction credit program

. On January 5, 2005 the Pittsburgh

- Beaver area, comprised of Beaver, Butler, Washington, and Westmoreland counties and portions of Allegheny, Armstrong, Greene and Lawrence 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 St ate, 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 source s, and nonroad mobile sources. For the PM2.5 NAAQS, the pollutants to be inventoried are PM 10, PM2.5, VOC, NOx, SO2 and

NH 3 . For the NAAQS, emissions should be reported as actual annual emissions.

The Point Source data for 2002 is derived from the Air Information Management System / environment, Facility, Application, Compliance Tracking System (AIMS/eFACTS). The AIMS /eFACTS database is comprised of sources identified and inventoried by PADEP’s regional and central offices through permitting, field insp ections, and surveys. Surveys are conducted annually as facilities must submit emission estimates for various operations, throughputs, work hours, as well as process data, such as combustion unit data and fuel characteristics. In 2002, PADEP noted that

m any facilities did not include condensable PM in their estimates of direct PM emissions.

MANE

- VU included both filterable and condensable PM estimates for their regional modeling efforts.

For the 2002 Nonpoint Source emissions, also known as “area sourc es,” PADEP provided an inventory that contained estimations of emissions by multiplying an emission factor by some known indicator or activity level for each category at the county level.

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, updated November 2005.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.

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 e stimate

emissions of ammonia from sources contained in the NONROAD model. PADEP provided emission estimates for locomotive engines and aircraft emissions separately. For locomotive engine emissions, PADEP projected emissions from a 1999 survey using

nat ional fuel consumption information and EPA emission and conversion factors.

Emissions from commercial aircraft and small airport operations for 2002 were estimated using the EPA

- approved Emissions and Dispersion Modeling System (EDMS) 4.20, the

latest ver sion available at the time the inventory was developed. PADEP estimated emissions using operations data obtained from the United States Department of Transportation, Federal Aviation Administration’s (FAA) Terminal Area Forecast for commercial aircraft op erations and the Airnav.com website for military operations. Using this operations data, emissions were modeled directly using the EDMS.

Commercial marine vessels emissions from the Port of Pittsburgh were estimated using

EPA’s “Commercial Marine Activi ty for Great Lakes and Inland River Ports in the United States, Final Report,” as well as discussions with tug boat operators. All Nonroad mobile source emissions were provided by SCC and classification.

The Onroad Mobile Source 2002 emissions inventory was developed using the most current version of EPA’s highway mobile source emissions model MOBILE 6.2. PADEP also used PPSUITE, an enhanced version of the Post Processor for Air Quality software systems used for previous inventory submissions in Pennsylva nia. The Pennsylvania Department of Transportation (PennDOT) provided estimates of vehicle miles traveled (VMT) by vehicle type and roadway type. PADEP provided sample Mobile6.2 input files and estimate results for review.

OAMA staff reviewed the file s and the emission results provided by PADEP and found

them to be approvable

.