Sacramento Metropolitan AQMD Roadways Modeling using CAL3QHCR (A Line Source Model) Step-By-Step Procedure

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Sacramento Metropolitan AQMDRoadways
Modelingusing CAL3QHCR (A Line Source
Model)Step-By-Step Procedure
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Example Project Location
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Example Project Information

• By 2009, residential receptors will be located
  south of I-80 (at B St) in Sacramento.
• Caltrans peak traffic hourly count
• 11,900 vehicles hour.

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Option 1- CAL3QHCR Roadway Modeling Procedure

• The CAL3QHCR modeling procedure requires both
  VMT, and grams per mile of PM10 for each hour of
  the day.
• This data is not usually available for any given
  road segment, but can be derived using EMFAC
  model results set for the annual average mode.

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Option 1- Uncertainty Issues

• This procedure may overestimate risks in that it
  assumes the toxicity of
• gasoline PM emissions diesel PM.
• (Studies show this is more likely true than not.)
• Additionally, it may underestimate or
  overestimate risks in that it assumes the
  Car/Truck ratio on roadways throughout the county
  are the same as the county average.
• This uncertainty can be overcome using more
  accurate segment specific VMT data.

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Data preparation for CAL3QHCR

• From CALTRANS, get road segment data representing
  the
• Peak Number of Vehicles/Hour
• Run EMFAC set for Annual Average data, for each
  of 24 hours in a day to get
• Annual Average Vehicle-Miles Traveled (VMT)
• Annual Average Tons PM10 emissions
• Using EMFAC data, normalize the countywide VMT
  data, then multiply it with the Peak
  vehicles/hour data, to get VMT for the road
  segment.
• Convert the EMFAC emissions to grams/hr, then
  divide the emissions by the hourly VMT straight
  from EMFAC to get a grams/VMT. Input this to
  CAL3QHCR.

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Derivation - Annual Average Grams/VMTfor each
hour of the day.
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Obtain Traffic Data from Caltrans
www.dot.ca.gov/hq/traffops/saferesr/traffdata/
Click on the most recent year
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Find Route
Scroll down here to find the route number. This
may require a phone call to CALTRANS to be
certain of the Route number. (I5?5)
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Find Peak Hour Traffic
Select ahead peak hour for projects north or east
of the nearest milepost location. This project is
just east of the E street marker.
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EMFAC Inputs and Outputs

• EMFAC inputs
• Year 2009
• Season annual
• Burden standard
• Output frequency hourly (tons/hr)
• EMFAC outputs
• Annual Average VMT for each hour of the day (all
  vehicles)
• PM10 exhaust emissions for each hour for ALL
  vehicles.

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Example EMFAC Output, Hour 00
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CAL3HQCR Modeling Procedure Overview

• Open an example/old control file (.ctl) file, and
  edit it with the new file names you will be
  using.
• Save the file with a new file name.
• Edit over the example/old batch file (.bat) by
  right clicking and editing.
• Save the file with the new name.
• Edit the Input file (.inp).
• Run the CAL3QHCR by double clicking on the batch
  file (.bat).
• Identify the Highest Average Annual
  Concentrations in the output file (.out) for each
  receptor.
• Calculate cancer risk levels at these locations.

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Prepare the CAL3QHCR Files

• These files are needed to run CAL3QHCR
• .ctl control file - CAL3QHCR looks to this file
  to find the files names that are read into
  the program, and outputted by the program.
• .bat batch file - DOS file batch command.
• .inp input file - contains scenario parameters.
• .exe executable file - performs the functions.
• .asc meteorology file - prepared previously.

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Step 1 - Edit the control (.ctl) file

• Open an example/old .ctl file and edit it with
  the new file names you will be using.
• Save the file with a new file name.

old
new
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Step 2 - Edit the batch (.bat) file

• Edit over the example/old .bat file by right
  clicking and editing.
• Save the file with the new name.

new
old
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Step 3 Edit the input (.inp) file

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Standard Inputs
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Example Projects Input File
REC W1 defines the roadway edge. REC W1 will be
thrown out because it is in the mixing zone.
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Step 4 Run the Model

• Double click the .bat file

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CAL3QHCR creates the following files

• The .ET1 file is a copy of emissions, traffic
  volume, and signalization data as read from the
  .inp file.
• The .ET2 file is a preprocessed .ET1 data file.
• The .ILK file is the link data file.

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Check for Errors.

• Open the .txt file and scroll down
• Program Terminated Normally we are good to go

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Open the .OUT File

• Identify the Highest Average Annual
  Concentrations

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Cancer Risk Calculation (Inhalation only pathway
is acceptable for Diesel PM)
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Cancer Risk Results
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Discussion