Technical Support Document (TSD) for the Redesignation Request and Maintenance Plan Forthe New Castle County Portion ofthe

Philadelphia-Wilmington, PA-NJ-DE 2006 PM2

### .sNonattainmentArea SubmittedNovember 2012 by the Delaware Department ofNatural Resources and Environmental Control TSD Prepared January 2014 by Jessica

### L. Fry Office ofAir Monitoring 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 Redesignation Request and Maintenance Plan for the New Castle County portion ofthe PhiladelphiaWilmington, PA-NJ-DE 2006 PM2 .5Nonattainment Areaby 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 redesignationrequest 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 reflect the emissions during the time the area came into attainment and are then projectedto 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 

### 2007Base YearInventory andNonattainment 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. For the purposes ofthis plan this inventory is called the base year inventory and contains primary PM2

.semissions (including condensibles), S02 ,NOx, VOC, and NH3. In a redesignation request, emissions inventories are used to support the States claim that the area has permanent and enforceable emissions reductions. In orderto do this, the state should estimate the percent reduction (from the year that was used to determine the design value for designation and classification) achieved from federal and state control measures; this is usually termed as the nonattainment year "base year" inventory. This inventory also contains primary PM2.s emissions (including condensibles), S02, NOx, VOC, and NI-h. DNREC did not include VOC and NH3 emissions in their tables in theirreport having determined them to be insignificant; however, they were submitted in the datapackage to EPA. DNREC submitted the 2007 inventory to fulfill both ofthese requirements. This section will discuss the 2007 base year/nonattainment year inventory that was used in the New Castle County portion ofthe Philadelphia-Wilmington, PANJ-DE Redesignation Request and Maintenance Plan submitted by DNREC. For the 2007 nonattainment 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 ManagementAssociation (MARAMA) regional planning process. A comprehensive county level inventory for the Philadelphianonattainment area (NAA) was developed by the DNREC's Department ofAir Quality (DAQ), in coordinationwith MARAMA, New Jersey and Pennsylvania's Department ofEnvironmental Protection. Documentation ofthe development ofthe inventory can be found in Technical Support Document for the Developmentof 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 inNew Castle County, DE. EPA guidance for emissions inventory developmentprovides 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 MOVES2010. The analysis was performed by the Northeast States for Coordinated Air Use Management (NESCAUM) for MARAMA's regional planning process. Vehicle miles traveled (VMT) datafor 2007 was provided by the Delaware Department of Transportation (DelDOT). OAMA staffreviewed the files and the emission results provided by DNREC and found them to be acceptable.



### III. Emissions Inventories for Maintenance Plan 

### 2008Attainment YearInventory andMaintenancePlan Base YearInventory The inventory used for the year ofattainment is calledthe 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 showthe area will remain in attainment. The base year inventory contains primary PM2

.semissions (including condensibles), S02and NOx

.Emissions for VOC and NH3 have been supplemented with the 2008 v3 NEI. This section will discuss the 2008 attainment year inventory that was used in the New Castle County portion ofthe Philadelphia-Wilmington, PA-NJ-DE Redesignation Request and Maintenance Plan submitted by DNREC. The 2008 point source inventory contained emissions for EGU and Non-EGU sources in New Castle County. EPA guidance for emissions inventory development provides that actual emissions should be used for purposes ofthe base year inventory. DNREC DAQ developed their point source inventory from information and data collected from facilities in the state. Forthe 2008 Nonpoint emissions, DNREC used the 2005 Delaware Periodic Emission Inventory as the starting pointfor their source category selection and methodology development.They added agricultural burning as a new source category to the nonpoint sector. DNREC also applied new methods and updated emissions factors to existing source categories where available. The majority ofDelaware's work involved collecting new activity data from local sources and applying it to the inventory. DNREC also did areview ofpoint and nonpoint sources to make sure there was no double counting ofsources. Forthe 2008 Nonroad emissions, DNREC used the 2005 Delaware Periodic Emission Inventory as the starting point for their source category selection and methodology development. The latest versions ofthe EPA'sNONROAD model and the Federal Aviation Administration's (FAA) Emissions and Dispersion Modeling System (EDMS) were used in the development of the 2008 inventory. Similar to the development ofthe Nonpoint inventory the majority ofthe work involved in developing the inventory consisted ofcollecting new activity data from local sources and applying it to the inventory. The Nonroad inventory contains emissions from aircrafts, locomotives, commercial marine vehicles (CMV), and other off-road vehicles and equipment The 2008 Onroad Mobile source inventory was developed using the most current version ofEPA's highway mobile source emissions model MOVES2010. Delaware used county specific inputs for the model where appropriate. OAMA staffreviewed the files and the emission results provided by WVDEP and found them to be acceptable. 

### IV. Projection Emissions Inventories for MaintenancePlan 2017and2025Projection EmissionInventories Projection inventories are used to show that the area will remain in attainment. DNREC used 2017 and 2025 emission projections methodologies developed through the MARAMA

.regional planning process for the interim and maintenance plan end year, respectively. They did this by adjusting the 2007 future year growth factors to a 2008 base yearby using the methodologies found in the Technical SupportDocument for the Development of the 2013 /

201 712020 Emission Inventoriesfor RegionalAir QualityModeling in the Northeast /

MidAtlanticRegion (MARAMA 2017 TSD) and the Technical SupportDocument for the Development of the 2025 Emission Inventory for PM2.5Nonattainment Counties in the MANEVURegion, 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 2008 inventory. The Department ofEnergy 2011

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_ rgy Outlook growth factors with control**factors lied**  due to Delaware's EGU regulations were used to develop the projected EGU emissions. Details regarding the emissions budgets can be found in the Technical Support Document (TSD)-Adequacy Findingsfor the Motor Vehicle Emissions Budgets in the Maintenance Plans for the Delaware Portion ofthe Philadelphia-Wilmington PA-NJ-DE 1997and2006Fine Particulate (PM2.5) NationalAmbient Air QualityStandards (NAAQS) NonattainmentArea.Nonpoint emissions for 2017 and 2025 were also developedby applying the appropriate growth/control factors to the 2008 inventory. Nonroad source emissions for 2017 and 2025 were developed using growth factors from EPA'sNMIM/NONROAD 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 WRAAssociates LLP, Wilmington, Delaware, under contractto DelDOT using the MOVES 2010 model. OAMA staffreviewed the methodologies provided by DNREC and found them to be acceptable.