Document ID: EPA-R04-OAR-2014-0250-0179
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2016-02-16T05:00Z

Methodology Used for MOVES Runspec

The discussion below identifies the inputs and settings used by the Shelby County Health Department  -  Pollution Control Section (SCHD-PCS) in the Run Specification file(s) (Runspec) to define the MOVES runs that were performed.

Description  -  provides descriptive details to help remember the purpose of the run and distinguish the output Run Specification file(s).

Scale  -  county level was selected as the domain and the emission inventory method was chosen for the calculation type.

Time Spans  -  inputs and settings were selected, as follows:
    * Time Aggregation Level input  -  `Hour' was selected. This was done in accordance with EPA guidance for the preferred aggregation level for SIP and/or conformity runs.
    * Years input  -  two MOVES runs were performed. 2006 was used as the year input in the first MOVES run and 2021 was used in the second run.
    * Months input  -  July was selected as the month that best represents summer ozone conditions.
    * Days input  -  weekdays were selected for the representative day type as they are considered to be the worst-case type when compared to weekends.
    * Hours input  -  all hours of the day were included to represent the 24-hour day.

Geographic Bounds  -  Shelby County, Tennessee was selected as the geographic boundary.

Vehicles/Equipment  -  all representative fuel and vehicle types within the transportation network were selected from this input category, which featured 13 different vehicle classes (referred to as source use types) and different fuel types. Due to the lack of compressed natural gas and liquefied petroleum gas vehicles in the population, this analysis incorporates diesel and gas fuel types only. This analysis also allows for default fuel formulation and fuel supply information to be used in the study area. With the exception of diesel-powered motorcycles, gasoline-powered combination long-haul trucks, and gasoline-powered intercity buses (which were removed because they are not represented in the vehicle population), all possible vehicle and fuel types were considered.

Road Type  -  all five roadway types, which include off-network, rural restricted access, rural unrestricted access, urban restricted access, and urban unrestricted access, were considered. Notably, the off-network is intended to account for vehicle starts and evaporative emissions from parked vehicles. While these emissions are not captured through the information in the regional travel demand models, default values can be used to assess their impacts.

Pollutants and Processes  -  Oxides of Nitrogen (NOx), Volatile Organic Compounds (VOCs), Non-Methane Hydrocarbons (NMHCs), and Total Gaseous Hydrocarbons (THCs) are selected because the purpose of the MOVES runs is to assess emissions relating to 8-hour ozone formation. Note, all pertinent processes associated with ozone formation are selected, however, vapor and spillage loss are not included as they are traditionally developed as part of the area source emissions inventory.

Miscellaneous Strategies  -  No information was entered for this section.

Output  -  To assist with post-processing aggregation, source use type information was included with the output. In addition, each of the MOVES runs creates output databases that include U.S tons, million btu's, and miles as the units of measure.

The table below summarizes the settings used in the MOVES run specification file.

Table   -  MOVES Runspec Parameters

MOVES Runspec Parameter 
Settings
MOVES2010b
Version 2012/04/10 
Description
provided descriptive details to help remember the purpose of the run and distinguish the output Run Specification file(s).
Scale
Domain/ Scale = County and Calculation Type = Inventory
Time Span
Time Aggregation Level = Hour

two MOVES runs were performed and input was selected as follows:
1) Years = 2006
2) Years = 2021

Months = One month (July) was selected to represent summertime ozone conditions

Hours = All hours of the day selected

Days = Selected Weekdays only
Geographic Bounds
1 custom domain  -  Shelby County, Tennessee
Vehicles/Equipment
All valid source types, gasoline and diesel
Road Type
All road types including off-network
Pollutants and Processes
NOx, VOCs, total gaseous hydrocarbons, and non-methane hydrocarbons
General Output
Units = U.S. tons, million btu, and miles
Output Emissions
Time = hour, location = link, on-road emissions by road type and source use type
Advanced Performance 
None