Volume 1: TRAQS User Guide (2018)

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TRAQS User Guide Page 114 8. EMFAC OPTIONS Under the TRAQS main window, press the EMFAC Options button to have access to the EMFAC Options window. TRAQS supports the EMFAC2014-PL version for Project-Level Assessments (PL). EMFAC2014-PL is an emissions inventory model that calculates emissions inventories for motor vehicles operating on roads in California. 8.1. EMFAC – CONFIGURATION The Configuration tab of the EMFAC Options window contains the following options:

TRAQS User Guide Page 115 Model Settings TRAQS was designed to support the following EMFAC model settings:  Run Mode: Emission Rate The emission rate is the output used for project-level assessment projects.  Run Type: Project-Level (PL) This is the mode used for project-level assessment projects.  Vehicle Class: Truck/Non-Truck This is one of the four vehicle category types supported by EMFAC and it is the only one sup- ported by TRAQS.  Model Year and Fuels: Aggregated TRAQS only supports the "Aggregated" mode for "Model Year" and "Fuel". The aggregation mode assumes the default assumptions on activity distribution by model year and fuel.  Analysis Type: For EMFAC, only the following analysis types are supported by TRAQS: 1. PM Project-Level Conformity Analysis: Option to complete a quantitative project- level conformity analysis for PM10 and/or PM2.5. 2. CO Project-Level Analysis (Screening): Option for carrying out a screening hot-spot analysis for Carbon Monoxide (CO). TRAQS only supports the EMFAC Simplified Approach EMFAC Options - Configuration tab

TRAQS User Guide Page 116 Geographic Bounds First, you must specify the State and County where your project is located.  Region Type: Select from the drop-down list one of the following options - Air Basin, Air District, MPO, County, or Sub-Area.  Region: Select from the drop-down list one of the available regions. Analysis Year This is the year of the analysis and it will show the year that you selected under the New Project Wizard. However, you will be able to modify your selection in this screen. TRAQS can model calen- dar years 2000 to 2050, inclusive, for projects using the EMFAC emissions model. You can only model a single year per project. Users who want to model multiple calendar years will need to cre- ate multiple TRAQS projects. NAAQS Pollutants For projects using the EMFAC emissions model, TRAQS only supports the following NAAQS pollu- tants: CO, PM10, and PM2.5. 8.1.1. EMFAC APPROACH FOR PROJECT-LEVEL ANALYSIS When completing a project-level analysis, using CARB's EMFAC emissions model, modelers need to determine the project scope and which approach is more applicable to their projects: 1. Simplified Approach: This approach uses EMFAC default parameters for the region such as:  Ambient temperature and relative humidity profiles  Vehicle age distributions  Vehicle rest/soak time 2. Detailed Approach: This approach is more appropriate when project-specific data for any of the three variables above is required/available. The Detailed Approach is usually more appropri- ate for Off-Network Links. TRAQS only supports the EMFAC Simplified Approach

TRAQS User Guide Page 117 8.2. EMFAC – SCENARIOS The Scenarios tab of the EMFAC Options window contains the same options available under the New Project Wizard – Project Scenarios screen. The Scenarios options are shown in this screen again to allow the user to make any necessary changes. Please see New Project Wizard – Project Scenarios, for a full description of the options available un- der the EMFAC Options – Scenarios tab. EMFAC Options - Scenarios tab

TRAQS User Guide Page 118 8.3. EMFAC – TEMPERATURE & HUMIDITY The Temperature & Humidity tab of the EMFAC Options window contains a grid where the user must specify ambient temperature and relative humidity values for each scenario. Scenarios This column displays the scenarios selected under the Scenarios tab. Scenarios are combinations based on the season and time of the day. Temperature (F) In this column, the user must specify the ambient temperature, in degrees Fahrenheit, for each season and day period combination. The temperature value can be any integer from -20 to 120 (F). Relative Humidity (%) In this column, the user must specify the relative humidity, in percentage, for each season and day period combination. The relative humidity value can be any integer from 0 to 100 (%). Press the column header to select the entire column. Press Ctrl+D to copy the contents of the first selected cell down to the cells below or press Ctrl+U to copy the contents of the last selected cell to all cells above. EMFAC Options - Temperature & Humidity tab

TRAQS User Guide Page 119 Functionality of Buttons Press this button to import data into the grid from a CSV file. The file must be in a specific format. Press the Export button to generate a template. Press this button to export the contents of the grid to a file in CSV format. This file can then be used to enter the requested data and imported back into TRAQS. Press this button to clear all values from the grid. 8.4. EMFAC – INPUT & OUTPUT FILES The EMFAC Input & Output Files tab of the EMFAC Options window contains the following op- tions: EMFAC Options - Input & Output Files tab

TRAQS User Guide Page 120 EMFAC Input & Output Files The grid available in this screen will be partially populated with information on the seasons and EM- FAC input/output files for the current project analysis: 1. Seasons: This column will be populated with the seasons that are being modeled for the cur- rent project (e.g., Winter, Spring, Summer, and Autumn). 2. EMFAC Input Files (*.ers): This column will be populated with the name of the EMFAC input file that will be generated by TRAQS. One input file is generated for each season being modeled. You must press the Create Input Files button in order for TRAQS to generate the EMFAC input files. To preview the file, press the button. 3. EMFAC Output Files (*.csv): This column will display the EMFAC output files, in csv format, that you have uploaded for each season model run. To upload the EMFAC output file, press the button. To preview the file, press the button. EMFAC2014-PL is not an open source application. Therefore, the user must install this application and run each generated input file (*.ers) outside the TRAQS interface. After the runs are completed, the user must upload the output files back into TRAQS under the EMFAC - Input & Output Files grid for post-processing. How to Run TRAQS EMFAC Input Files 1. Press the Create Input Files button. TRAQS will generate all required EMFAC input files (*.ers) based on the scenarios selected for the current project. 2. Press the EMFAC2014 button. This button will call CARB's EMFAC2014-PL application that you must install in your computer and specify the path under the Preferences dialog. 3. A message is displayed indicating which folder the EMFAC input files (*.ers), generated by TRAQS, are located. To help you to locate this folder, TRAQS copies the path to these files to the Windows Clipboard. 4. CARB's EMFAC2014-PL application is displayed. Select the File | Open menu option.

TRAQS User Guide Page 121 5. The Open dialog is displayed. Place the cursor on the File name field and press the CTRL+V keyboard keys to paste the path to the current's project EMFAC input files (*.ers). Press Enter. Select the Winter input file and press the Open button. 6. The selected project is opened. Review the options pre-selected in each screen (Area, Time, Vehicles, Meteorology, and Output) by pressing the Next button when done. You should not change any of the pre-selected options as these are the options that you selected under the TRAQS interface – EMFAC Options window.

TRAQS User Guide Page 122 Please note that not all the CARB's EMFAC options are supported by TRAQS and therefore, it is recommended that you do not make any changes in EMFAC as they may affect the post-processing of the output options by TRAQS. 7. On the last Output screen, the Run button is displayed at the bottom right corner. Notice that the file path where the output files will be saved is displayed under the Output Files Di- rectory field. Press Run.

TRAQS User Guide Page 123 8. After the Run is finished, repeat steps 4 to 7 again for the remaining seasonal input files, if applicable (e.g., Spring, Summer, Autumn). Close the application when all runs are done. 9. Back in TRAQS, specify the location of each output file, generated by CARB's EMFAC2014-PL, by pressing the under the cell corresponding to each season output file. Once you specify the output file, TRAQS will make a copy of the specified output file and store it under the "traqs_emfac" sub-folder for the current project. This is also the location where the EMFAC input files are stored. Press the OK button to close the EMFAC Options window when done. Make sure to specify the correct EMFAC output file (*.csv) which corresponding to the season specified for each particular row of the grid.

TRAQS User Guide Page 124 For a project with 16 scenarios, only a total of 4 EMFAC input files will be generated, one per season. Within each season's input file, 4 sets of temperature and humidity parameters will be specified for each one of the 4 day periods (AM-Peak, Mid-day, PM-Peak, and Overnight). Functionality of Buttons Press this button to generate the EMFAC input file based on the options spec- ified under the EMFAC Options window. Press this button to open the "traqs_emfac" folder in Windows Explorer. This is the folder where all EMFAC input and output files will be stored. Press this button the clear all contents of the EMFAC Output Files column. Now that mobile emissions data is complete, the next step is to complete air disper- sion modeling for the Project-Level pollutants.