Technical Support Document (TSD) for the RedesignationRequest and Maintenance Plan Forthe NewCastle County Portion ofthe

Philadelphia-Wilmington, PA-NJ-DE 1997 PM2.sNonattainmentArea

SubmittedNovember 2012 bythe Delaware Department ofNaturalResources and Environmental Control TSD Prepared January 2014 by Jessica L. Fry Office ofAirMonitoring and Analysis, 3AP40 U.S. Environmental ProtectionAgency, Region 3 1650 Arch Street Philadelphia, Pennsylvania 19103

Reviewed byAllee H. Chow, Associate Director Office ofAirMonitoring 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 Redesignation Request and Maintenance Plan for the New Castle County portion ofthe PhiladelphiaWilmington, PA-NJ-DE 1997 

### PM2.s Nonattainment Area by the Delaware Department ofNatural Resources and Environmental Control (DNREC). This review does not determine the approvability ofthe redesignation request or maintenance plan. Emissions inventories in a redesignation request are used to showpermanent and enforceable emission reductions between the year the area was designated as a nonattainment area and the yearthe area came into attainment. In a maintenance plan, the emissions inventories are used to reflectthe emissions during the time the area came into attainment and are then projected to showthat the area will remain in attainment. 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. Emissions Inventories for Redesignation Request 2002 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 is called the base year inventory and contains primary PM2.5 emissions (including condensibles), S02, NOx, VOC, and NH3. DNREC submitted their 2002 Base Year Inventory to EPA as a State Implementation Plan (SIP) revision on April 3, 2008. The inventory was approved by EPA and the rule became effective April 3, 2013 (78 FR 14020). 

### III. Emissions Inventories for Maintenance Plan 

### 2007Attainment YearInventory andMaintenancePlan Base YearInventory The inventory used for the year ofattainment is called the attainment year inventory and also is referred to as the maintenance plan base year inventory. This inventory is used as the basis for the projected inventories that are used to show the area will remain in attainment. The base year inventory contains primary PMz.s emissions (including condensibles), S02and NOx. DNREC submitted VOC and NH3 emissions in their datapackage submitted to EPA, although it is not represented inthe tables in the report. This section will discuss the 2007 attainment year inventorythat was used in the New Castle County portion ofthe Philadelphia-Wilmington, PA

### NJ-UE Kedesignation Request and Maintenance Plan submitted by DNREC. For the 2007 attainment year inventory for all source categories (point, nonpoint, nonroad, and onroad) DNREC submitted the 2007 Version 3 Emissions Inventory developed through the Mid-Atlantic Regional Air Management Association (MARAMA) regional planning process. A comprehensive county level inventory for the Philadelphianonattainment area(NAA) was developed bythe DNREC's Department ofAir Quality (DAQ), in coordination with MARAMA, NewJersey and Pennsylvania's Department ofEnvironmental Protection. Documentation ofthe development ofthe inventory can be found in Technical Support Document for the Development of the 2007Emission Inventory for the RegionalAir Quality Modeling in the NortheastIMid-Atlantic Region Version 3.3. January 23, 2012. The 2007 point source inventory contained emissions for electric generating units (EGUs) and Non-EGU sources in New Castle County, DE. EPA guidance for emissions inventory development provides that actual emissions should be used for purposes ofthe base year inventory. The point source inventory submitted was developed by MARAMA in consultation with DNREC DAQ using information compiled from 2007 Annual Emissions Reports submitted to Delaware from Point sources in the state. The nonpoint source emissions inventory for 2007 was developed using 2007 specific activity data along with EPA emission factors and the most recently available emission calculation methodologies. The 2007 nonroad emissions were generated the emissions using EPA'sNational Mobile Inventory Model (NMIM) emissions model. Marine, air and rail/locomotive (MAR) emissions are not part ofthe NMIM and were calculated separately. The 2007 onroad mobile source inventory was developed using EPA'shighway mobile source emissions model MOVES2010a. The analysis was performed by the Northeast States for Coordinated Air Use Management (NESCAUM) for MARAMA'sregional planning process. Vehicle miles traveled (VMT) data for 2007 was provided by the Delaware Department of Transportation (DelDOT). OAMA staffreviewedthe files and the emission results provided by WVDEP and found them to be acceptable. 

### III. Projection Emissions Inventories for MaintenancePlan 

### 2017and2025Projection Emission Inventories Projection inventories are used to show that the area will remain in attainment. DNREC used 2017 and 2025 emissionprojections developed through the MARAMA regional planning process for the interim and maintenance plan end year, respectively. Emissionprojections, emission methodologies and growth factors for 2017 and 2025 can be found in the Technical SupportDocument for the Developmentof the 2013/201712020 Emission Inventoriesfor RegionalAir QualityModeling in the Northeast/Mid-Atlantic Region (MARAMA 2017 TSD) and the Technical SupportDocument for the Developmentof the 2025 Emission Inventory for PM2.5Nonattainment Counties in the MANE-VURegion, January 2012 (MARAMA 2025 TSD), respectively. The 2017 and 2025 point source inventories were estimated by using appropriate growth/control factors and applying them to the 2007 inventory. The Department ofEnergy 2011Annual Energy Outlook growth factors, with control factors applied due to Delaware's EGU regulations were used to develop the projected EGU emissions. Nonpoint emissions for 2017 and 2025 were also developed by applying the appropriate growth/control factors to the 2007 inventory. Nonroad source emissions for 2017 and 2025 were developed using growth factors from EPA'sNMIM model. DNREC developed an onroad mobile emissions inventory for 2017 and 2025 using MOVES 2010. However, for mobile budget purposes DNREC is using the 2012 inventory in lieu ofthe projected mobile emissions for 2017 and 2025. The 2012 onroad inventory modeling was performed by WRA Associates LLP, Wilmington, Delaware, under contractto DelDOT using the MOVES 2010 model. Details regarding the emissions budgets can be found in the Technical SupportDocument (FSD)-Adequacy Findingsfor the Motor Vehicle Emissions Budgets in the Maintenance Plans for the Delaware Portion of the Philadelphia-WilmingtonPANJ-DE 1997and2006Fine Particulate (PM 2.5

) NationalAmbientAir QualityStandards (NAAQS) NonattainmentArea. OAMA staffreviewed the methodologies provided by DNREC and found them to be acceptable.