### Technical SupportDocument (TSD) For Liberty-Clairton PM 2.5 Nonattainment Area 2006 Standards:

State Implementation Plan (SIP) AttainmentDemonstration and Base Year Inventory

TSD Prepared August 2015 by Jessica Fry Office ofAirMonitoring and Analysis, 3AP40 U.S. Environmental ProtectionAgency, Region 3 1650 Arch Street Philadelphia, Pennsylvania 19103

# Rev~~Le**!o~~te**Director Office ofAir Monitoring and Analysis (3AP40)

# o~**u;S"** I6ate tgiledI. 

### Introduction

The purpose ofthis document is to provide a technical summary ofthe Office ofAir Monitoring and Analysis (OAMA) review ofthe emissions inventories submitted with the Liberty-ClairtonPM 2.5 Nonattainment Area (NAA) State Implementation Plan (SIP) for the 2006 Standards by the Allegheny County Health Department (ACHD). This review determines the approvability ofthe 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 ofan emissions reduction credit program. Projection year inventories are essentially used to track progress; the purpose ofwhich is to demonstrate a reduction in emissions ofregulated sources from the Base Yearto a projected year. OnNovember 13, 2009, the Liberty-Clairton area, located in Allegheny County and comprised ofthe boroughs ofGlassport, Liberty, Lincoln, Port Vue, and the city ofClairton was designated as nonattainment for the 2006 PM2.5 NAAQS. Any questions pertaining to this technical summary should be directed to Alice H. Chow, Associate Director, Office ofAir Monitoring and Analysis, at 215-814-2144 or via email
at chow.alice@epa

.gov.



### II. 2007 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. Under section 172(c)(3) ofthe Clean Air Act (CAA) states are required to submit a comprehensive, accurate, current accounting ofactual emissions from all sources (point, nonpoint, nonroad, and onroad) in the nonattainment. 1 This inventory contains primary PM2.s emissions (including condensibles), PMto, S02, NOx, VOC, and NH3

. This section will discuss the 2007 emissions inventory that was submitted by ACHD.

Forthe 2007 base year inventory for the point, nonpoint, nonroad, and onroad categories, ACHD used the 2007 Version 3.3 Emissions Inventory developed for the Mid-Atlantic/Northeast Visibility Union (MANE-VU) through the Mid-Atlantic Regional Air Management Association (MARAMA) regional planning process as a starting point for emission development. Documentation ofthe development ofthe inventory can be found in Technical SupportDocument for the Development of the 2007Emission Inventoryfor the RegionalAir QualityModeling in the NortheastIMid-Atlantic Region Version 3.3. January 23, 2012. Refined emission calculations for nonpoint, nonroad, and onroad emissions were made by TranSystemsiE.H. Pechan (TSIPechan) under contractto ACHD. Point source emissionupdates were made by ACHD.

The 2007 point source inventory contains emissions for all point sources in the NAA. EPA guidance for emissions inventory development provides that actual emissions should be used for purposes ofthe base year inventory. ACHD used the 2007 MARAMA/MANE-VU inventory as a starting point for emission development. Further

1 "Emissions inventory Guidance for implementation of Ozone andParticulate Matter NationalAmbient Air QualityStandards (NAAQS) andRegionalHaze Regulations" EPA-454/R-05-00I, August 2005, updated November 2005.adjustments were made by ACHD to account for newer emission estimates, based on updated stacktests and emission factors.

The nonpoint, also known as "area," source emissions inventory for 2007 was developed using the 2007 MANE-VU inventory as a startingpoint with refinements made by TSIPechan. Priority source categories were identified by TSIPechan and emission estimates were updated using more localized activity data and emission calculation methodologies at the NAA-level. The following source categories were considered a priority: Residential Wood Combustion; Construction Dust; Industrial Coal Combustion; Commercial/Institutional Coal Combustion; Commercial Cooking; and OpenBurning. Forthe source categories that were not prioritized the 2007 MANE-VU emissions were used and county level data was apportioned by population to account for the area in the NAA (1.64 percent).

The nonroad source emissions inventory for 2007 was developed using a similiar methodology as the nonpoint. Priority source categories were identified by TSIPechan and refinements were made to the 2007 MANE-VU inventory to get a better representation ofemissions at the NAA-level. Class I and 111111 line haul locomotives, commercial marine vessels, and diesel construction equipmentwere identified as priority

sources. There are no airports orpassengerrail lines in the NAA. Forthe source categories that were notprioritized the 2007 MANE-VU emissions were used and county level data was apportioned by population to account for the area in the NAA (1.64 percent).

The 2007 onroad mobile source inventory was developed using EPA's highway mobile source emissions model MOVES2010a. TSIPechan used local activity to replace default inputs in the model where appropriate.

OAMA staffreviewed the files and the emission results provided by ACHD and found them to be acceptable.