·. 

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

REGION III 

1650 Arch Street 

Philadelphia, Pennsylvania 19103 

SUBJECT: Technical Support Document (TSD)- Review ofthe On-Road Portion ofthe 2011 

Base Year Inventories for the Pennsylvania Portion of the Following Five 2008 8-

Hour Ozone National Ambient Air Quality Standard (NAAQS) Nonattainment 

Areas: Allentown-Bethlehem-Easton, Lancaster, Philadelphia-Wilmington-Atlantic 

City, Pittsburgh-Beaver Valley, and Reading 

FROM: Asrah Khadr, Environmental Engineer, EIT 0 ~ '}~ l/?J .) \\-

Office of Air Program Planning (3AP30) \.JPTO: 

THRU: 

File 

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Crfstfna Fernandez Associate Director 

Office of Air Program Planning (3AP30) 

I. Background 

This TSD documents the review of the on-road portion of the 2011 base year inventories for the 

aforementioned five 2008 8-hour ozone NAAQS nonattainment areas. For additional 

information about this action, please refer to the notice of proposed rulemaking (NPR) and direct 

final rulemaking notice (DFRN) in this docket. 

II. Review of the Submitted Modeling Utilizing the Motor Vehicle Emission Simulator 

{MOVES2010b) 

To evaluate the submitted motor vehicle emissions inventory, it was necessary to review the 

supporting modeling completed using MOVES2010b. The submitted files include run 

specifications (RunSpecs) describing the scenario parameters, input databases containing local 

fleet data, and an output database containing the modeling results. The submitted RunSpecs, 

input databases, and output databases were reviewed against the EPA document: Technical 

Guidance on the use of MO VES20 10 for Emission Inventory Preparation in State 

Implementation Plans and Transportation Conformity. This document provides guidance on the 

use of the MOVES model to develop inventories for SIPs as well as analysis of emissions for 

transportation conformity determinations. 

EPA carefully reviewed the RunSpecs, input databases, and output databases used in the 

analyses to ensure they were completed consistent with the recommendations outlined in the 

above mentioned MOVES Technical Guidance and are appropriately representative of the 

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modeling domain and analysis year. Table 1 presents a summary ofthe review of the RunSpecs 

and the selections made for each parameter. Table 2 presents a summary of the review of each 

MOVES input parameter from the submittal. Table 3 presents a summary of the review of the 

output and post-processing methodology. 

The RunSpecs, input databases, and output databases were reviewed and found to have followed 

the applicable EPA guidance provided in the Technical Guidance on the use ofMOVES2010for 

Emission Inventory Preparation in State Implementation. Plans and Transportation Conformity. 

Additionally, sufficient documentation was provided to support the data, decisions, and 

assumptions made for each parameter. 

Table 1. Review of RunS pees for year 2011 for the Five 8-Hour Ozone NAAQS 

Nonattainment Areas 

Domain/Scale County scale was selected - allowing for appropriate detail 

necessary for regulatory analysis. 

Time Spans Panel Hourly time aggregation was selected. All appropriate months, 

days, and hours were selected. The appropriate year was selected 

for the scenario being modeled. 

Geographic Bounds The appropriate county was selected. 

Vehicles/Equipment Gasoline, ethanol, diesel, and compressed natural gas (CNG) fuels 

were selected. All source types were selected. 

Road Type All road types were selected. 

Pollutants and Processes Nitrogen oxides (NOx) and volatile organic compounds (VOCs) 

were selected. All processes were included in the analysis. 

Table 2. Review of MOVES input databases for year 2011 for the Five 8-Hour Ozone 

NAAQS Nonattainment Areas 

Parameter Submittal 

Age Distribution All source types were included with fractions for ages (0-30 years). 

Average Speed Average speed distributions were provided for all source types, for 

Distribution each combination of road type and hour of the day. 

Fuel (fuel formulation, • A complete fuel supply table was provided with all fuel types 

fuel supply, fuel usage, present in the region. 

andAVFT) • Appropriate fuel properties were included in the fuel 

formulation table, including Reid Vapor Pressure (RVP), 

ethanol content, and sulfur levels. 

• The fuel usage table was provided and described the ethanol 

use by E-85 capable vehicles. 

• The alternative vehicles and fuel technologies (A VFT) table 

was provided. 

• Any and all changes to the default fuels have been 

sufficiently documented. 

Meteorology Data Local meteorology data (temperature and humidity) was provided for 

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each hour of the day for each month. 

Ramp Fraction Local fractions of ramp driving times were provided for restricted 

access roadways. 

Road Type Distribution The vehicle miles traveled (VMT) fraction for each road type was 

provided for each source type and road type. 

Source Type The number of vehicles of each source type was provided. 

Population 

• Annual VMT was provided for the five MOVES highway 

performance management system (HPMS) vehicle categories. 

Vehicle Type VMT • Monthly VMT fractions were provided for all source types 

(includes inputs for and month. 

annual VMT, daily • Daily VMT fractions were provided for all days and source 

VMT fraction, hourly types. 

VMT fraction, and • Hourly VMT fractions were provided for each day type and 

monthly VMT fraction) source type. 

Hotelling The hotelling activity (auxiliary power unit (APU) use vs extended · 

idle vs. engine oft)_ was described for all model years. 

Inspection/Maintenance 

(IIM) Programs The existing IIM program was accurately described. 

Table 3. Review of the output database and post-processing steps for year 2011 for the 

Five 8-Hour Ozone NAAQS Nonattainment Areas 

MOVESrun table Appropriate version of MOVES was used. All calculation . bundles were processed. 

MOVES error table No errors were produced in any of the runs. 

MOVESoutput The output contains emission results for all necessary source 

types, processes, and pollutants. 

Output processing The output was appropriately summed to generate the emissions 

inventory. The methodology was documented. 

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