Technical SupportDocument (TSD) for the Base Year Inventory Forthe Lower BeaverValley 2008 LeadNAAQS Nonattaininent Area

Submitted January 2015 by the PennsylvaniaDepartment ofEnvironmental Protection

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

Reviewed byAlice H. Chow, Associate Director Office ofAir Monitoring and Analysis (3AP40)

### I. 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 Pennsylvania State Implementation Plan (SIP) Revision: Attainment Demonstration and Base Year Inventory, Lower Beaver Valley AreaNonattainment Area (NAA) for the 2008 Lead NAAQS. Under the Clean Air Act (CAA) sections 172(c)(3) states are required to submit emissions inventory information for all relevant sources for the areas that are designated nonattainment. The Pennsylvania Department ofEnvironmental Protection (PADEP) has submitted a 2010 Base Year Inventory for the Lower Beaver Valley 2008 LeadNAAQS Nonattainment Area in orderto fulfill the CAA requirements. Any questions pertaining to this technical summary shouldbe directed to Alice H. Chow, Associate Director, Office ofAir Monitoring and Analysis, at 215-814-2144 orvia email at chow.alice@epa.gov.



### II 2010 Base YearInventory

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. This inventory contains actual annual emissions of lead. The base year inventory (typically one ofthe years in whichthe area was designated for the standard) includes emissions estimates from stationary point and nonpoint sources. There are no onroad and nonroad source emiss

. ions in the NAA, mainly due to the ban on leaded gasoline inhighway vehicles. TheNAA does not contain any airports or landing strips which canbe a source ofmobile source lead emissions. The Townships ofPotter, Vanport, and Center in Beaver County, PA are included in the NAA.

PADEP submitted a 2010 inventory for the point sources in the NAA. EPA guidance for emissions inventory developmentprovides that actual emissions shouldbe used for purposes ofthe base year inventory. Horseheads Facility and AES are the two
sources oflead emissions in the NAA. PADEP requires larger emitting facilities to report production figures and emission calculations annually. Throughput data are multiplied by emission factors based on source classification codes (SCC) to develop emission estimates.

Forthe nonpoint source emissions, also known as "area sources," PADEP submitted EPA's 2011 NEI v2 as a surrogate for the 2010 inventory. To calculate nonpoint values for the portion ofBeaver County included in the NAA, PADEP used county data apportioned bypopulation, ofwhich 8% ofthe population ofBeaver County is included in the NAA. The nonpoint source emissions are insignificant when compared to the point source emissions in the NAA. After reviewing the nonpoint emissions, EPA found the use ofthe NEI acceptable.

OAMA staffreviewed the results, procedures, and methodologies for the SIP base year, and found them to be acceptable.