Technical Support Document (TSD) For the 2011 Base Year Inventory For Areas ofMarginal Nonattainment ofthe 2008 Ozone NAAQS in Pennsylvania

Submitted September 2015 by the Pennsylvania Department ofEnvi ronmenta1Protection TSD Prepared January 2016 by Jessica 

### L. Fry Office ofAir Monitoring and Analysis, 3AP40 U.S. Environmental Protection Agency, Region 3 1650 Arch Street Philadelphia, Pennsylvania 19103

Reviewed by Alice H. Chow, Associate Director Office ofAir Monitoring and Analysis (3AP40)I. Introduction The purpose ofthis document is to provide a technical summary ofthe Office of Air Monitoring and Analysis (OAMA) review ofthe 2011 Base Year Inventory submitted for areas ofmarginal nonattainment ofthe 2008 Ozone NAAQS in Pennsylvania (PA), submitted by the Pennsylvania Department ofEnvironmental Protection (PADEP). There are five marginal nonattainment areas (NAAs) for the 2008 Ozone NAAQS in Pennsylvania. EPA designated the NAAs as marginal for the 2008 Ozone NAAQS effective July 20, 2012. This requires the area to submit a comprehensive base year inventory no later than 24 months from the July 20, 2012 effective date and every three years thereafter. 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. Under the Clean Air Act (CAA) sections 172(c)(3) and 182(a)(l), states are required to submit emissions inventory information for all relevant sources for the areas that are designated nonattainment. PADEP has submitted a 2011 Base Year Inventory for the five Pennsylvania NAAs in order to fulfill the CAA requirements. 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 2011 Base Year Inventory Under section 172(c)(3) states are required to submit a comprehensive, accurate, current accounting ofactual emissions from all sources (point, nonpoint, nonroad, and onroad) in the nonattainment area. The CAA section 182(a)(1) requires that areas designated as nonattainment and classified as marginal are to submit an inventory ofall sources ofozone precursors no later than 2 years after the effective date ofdesignation. This inventory contains actual annual emissions and typical ozone season day emissions for the ozone season ofMay through September for the ozone precursors, NOx, CO, and VOC. The base year inventory includes emissions estimates from stationary point and nonpoint sources, onroad mobile sources, and nonroad mobile sources. Below is a list of the five NAAs that are designated as marginal for the 2008 Ozone NAAQS:

• Allentown-Bethlehem-Easton, PA o Carbon County o Lehigh County o Northampton County

• Lancaster, PA o Lancaster County

• Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE o Bucks County · o Chester County o Delaware County o Montgomery County o Philadelphia County• Pittsburgh-Beaver Valley, PA o Allegheny County o Armstrong County o Beaver County o Butler County o Fayette County o Washington County o Westmoreland County

• Reading, PA o Berks County PADEP submitted a 2011 base year inventory for all source categories in the NAA. EPA guidance for emissions inventory development provides that actual emissions should be used for purposes ofthe base year inventory. PADEP used emissions from EPA's 2011 NEI v2 for the 2011 base year inventory for point, nonpoint, and nomoad sources. Documentation for the 2011 NEI can be found at http://www.epa.gov/ttn!chief/net/20 11 inventory

.html. In order to get summer day emission averages, PADEP used the Emissions Modeling Framework (EMF) and imported Sparse Matrix Operator Kernel (SMOKE) files that were downloaded from the Emissions Inventory System (EIS) Gateway. Omoad emissions were prepared for PADEP by Michael Baker, Jr., Inc. The analysis was completed by running EPA's highway mobile source emissions model MOVES 2010b using local and default data. Local data for 2011 was obtained from Pennsylvania Department ofTransportation (PennDOT), the Bureau ofMotor Vehicles, and other local sources. OAMA staffreviewed the results, procedures, and methodologies for the SIP base year, and found them to be acceptable.