### ___________________________________________________ ___________________ A-1 

## APPENDIX A

Gridded Inventory Coordination Group Minutes

February 26, 2003

Attendees Affiliation
Amir Fanai, Glen Long, Toch Mangat, Phil Martien Ba y Area AQMD Bruce Katayama, Aleta Kinnard, Hao Quinn, Greg Thol en Sacramento Metro AQMD Cyndi Loomis, Jim Wilkinson Alpine Geophysics Vernon Hughes, Ajith Kaduwela, Cheryl Taylor ARB



### 1. Welcome

Cheryl welcomed everyone to the call. Introduction s were made.

2. General Discussion

a) Purpose of the Coordination Group

This group was formed as an outgrowth of the Februa ry 19 modeling conference call, where several districts expressed a desire to review the gridded inventories to be used in modeling for the SIPs. The group agreed that the more people who review the inventories, the more likely they will s pot problems quickly. More reviewers can also share the burden of reviewing su ch large amounts of information. The districts have specific knowledge about the inv entories in their regions, so are more likely to discover problems.

b) Goals/Expectations of the Group

The goal of the group is to provide gridded invento ries for review in an easily

accessible and coordinated manner. There are sever al gridded inventories that will be available for review by the group, including epi sodes for July/August 2000, September 2000, and June 2000. The creation of gri dded inventories for July 1999 and a 2002 episode are being considered. ARB, Alpi ne Geophysics, and Environ are creating pieces of the various gridded inventor ies. ARB will receive all the pieces and will be assembling them for each episode . The group agreed that

inventories should be made available for review whe never they are available, regardless of priority for the SIPs. Cheryl will d istribute minutes.

### ___________________________________________________ ___________________ A-2 c) Timeframe for Reviewing Inventories

The group agreed that an email would be broadcast w hen a new inventory had been posted for review. A period of two weeks for revie w would begin once the

notification had been sent.

d) Feedback from Reviewers – What Will be the Proce ss to Incorporate/Investigate any Comments or Requested C hanges?

It was suggested that there be a structured form fo r comments; this will be discussed at future meetings. Requests to change emissions s hould be made through the normal channels, such as the Emission Inventory Bra nch at ARB. The entire group is to be notified if there are changes to the emiss ions or if other problems are

identified.

e) Frequency of Meetings

The group did not specifically determine the freque ncy of the meetings, but they agreed to meet again in three weeks.

3. Discuss Specifics of How to Review Gridded Inven tories

Vernon described the basic steps to creating model- ready gridded inventories. Base year criteria emissions are fed from CEIDARS (Calif ornia Emission Inventory Development and Reporting System) into CEFS (Califo rnia Emission Forecasting System). CEFS creates base year and future year in ventories by air basin, county, and source category (SIC/SCC for point sources or EIC f or all other sources) for either a weekday or a weekend day for a specified month. Da y-specific data are then merged in. Next, EMS-95 is used to distribute the emissio ns both spatially and temporally (down to grid cell by hour). Then the emissions ar e speciated and reformatted to create model-specific gridded inventories.

The group agreed that the following reports would b e useful:

1) Tabular reports from CEIDARS/CEFS (summary of em issions of criteria pollutants by county/air basin and by 3-digit EIC – base year and forecasted years) 2) Tabular and graphical (tile plots) reports of th e model-ready gridded inventories 3) Intermediate SAS files (gridded hourly criteria inventory with categories in tact) 4) Model-ready files 5) Speciation profiles 6) Spatial Surrogates 7) Temporal Profiles

Cyndi said that she already has summary reports tha t she would be willing to run on the gridded inventories as they become available for re view. Gridded inventories for the

### ___________________________________________________ ___________________ A-3 July/August 2000 episode are available now for revi ew. Vernon emphasized that version control (e.g. version of EMFAC used in the gridded inventory) is very important and needs to be stated clearly for each gridded inv entory.

4. Discuss How to Access Gridded Inventories Cyndi volunteered Alpine Geophysics to be the repos itory of information by hosting an ftp site accessed through the Web. ARB may take ov er this duty in the next few weeks after ARB finalizes its global file directory synta x.

Cyndi and Vernon will discuss the details of exactl y what will be posted. ARB will then distribute a one-page proposal to the group for com ment. The proposal would detail what reports and version control information would be provided for review. Cyndi will set up a website and post data within a couple of w eeks. The group will be notified

when data are available and how to access the site. At the next call, the group will discuss the website and reports; changes will be in corporated as agreed.

5. Other Districts Who May Wish to be Involved? Phil suggested that Bob Nunes from Monterey Bay Uni fied APCD might be interested in participating in this group. Vernon will call him.

Jim suggested that representatives from the COGs mi ght also be interested in reviewing

the on-road mobile source emissions. Jim has a lis t of the COG representatives that he has spoken with in preparing the roadway network fo r the CCOS domain. He will send the list to Vernon who will give them to Ed Yotter for review. Ed will be asked to join this

group.

6. Other Issues

No other issues were discussed.

7. Plans for Next Meeting The next conference call is scheduled for Wednesday , March 19.



## March 19, 2003

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien Bay Area AQMD

Bob Nunes Monterey Bay Unified APCD Charles Anderson, Bruce Katayama, Greg Tholen, Brig ette Tollstrup Sacramento Metro AQMD

Donald Hunsaker, David Nunes, Evan Shipp, Michelle Stanley San Joaquin Valley Unified APCD

Vincent Liu Kern COG

Harold Brazil MTC

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Vernon Hughes, Cheryl Taylor, Ed Yotter ARB

### ___________________________________________________ ___________________ A-4 1. Welcome and Feedback on February 26 Minutes

ARB welcomed everyone to the call. Introductions w ere made. There were no comments on the February 26 minutes. 2. Discuss How to Efficiently Transfer and Track Re view of Gridded Inventories

Alpine Geophysics described how they propose to set up the ftp site (not a web page) to efficiently transfer and track the review of the gr idded inventories. There will be three main parts: “read me” files, a data-tracking log, and the files/reports themselves. The “read me” files and data tracking log are described below; the files/reports are

discussed in Item 3.

The “read me” files will contain several pieces of information. One part will discuss the naming convention used to describe each gridded fil e for review. ARB has developed a naming convention that describes the file. The nam e will state the domain (CCAQS), episode day, source type (point, area, on-road moto r vehicle, or biogenics), sourcespecific information (e.g. version of EMFAC), when the file was created and the version, chemical mechanism (e.g. SAPRC), speciation version , and model format (e.g. ascii).

Another “read me” file will describe the data-track ing log, how to use it, and what to do if you find problems in the gridded inventories. The BAAQMD suggested that a “read me”

file include a discussion of what each file contain s (e.g. data dictionary) as well as other

information such as the units of the emissions. A “read me” file will also describe how Alpine Geophysics developed a model to add commerci al VMT to the Integrated Transportation Network (ITN) (see Item 4 below). A “read me” file will describe the differences in VMT between the ITN and EMFAC 2002 ( see Item 4 below)

Alpine Geophysics has developed a data-tracking log . The log shows the current inventory, date released, problems identified, who identified the problem and when, how the problem was fixed, and who fixed the problem an d when. Per the group’s request, Alpine Geophysics will include a list of standard Q A procedures that they have implemented in reviewing the inventories to avoid d uplication of effort.

ARB will develop a one-page proposal that will deta il what information will be posted on the ftp site, and distribute it to the group for co mment. ARB reminded everyone that both time and resources are growing shorter, so the number of custom reports may be limited. The San Joaquin Valley district said that they might be able to provide assistance to other districts by providing plots an d/or reports.

3. Discuss New Site for Accessing Gridded Inventori es

The ftp site is not available yet for viewing, but should be ready next week. Below is a list of the reports that will be available on the f tp site. Information for the July/August 2000 episode will posted first. Information for ot her episodes will be posted when available. Episodes that are planned include Septe mber 2000, July 1999, and June

2000.

### ___________________________________________________ ___________________ A-5 Alpine Geophysics is putting together a report that describes how the gridded on-road motor vehicle inventory was created. The report wi ll describe how the Integrated Transportation Network (ITN) for the entire CCOS/CR PAQS domain was developed. It will also describe how the day-specific data, which were collected by Dr. Deb Niemeier of UC Davis, were incorporated. The report should be available in two weeks and will be distributed to the group a few days prior to the next call.

List of data/reports that will be available on the ftp site:

1) Tabular reports from CEFS, the inventory forecas ting system (summary of emissions of criteria pollutants by county/air basi n and by 3-digit EIC – base year and forecasted years) 2) Tabular and graphical (tile plots) reports of th e model-ready gridded inventories by 3-digit EIC by county 3) Intermediate SAS files (gridded hourly criteria inventory by 3-digit EIC) 4) Model-ready files (will include 4 sets - CAMx an d SAQM models each using CB-IV and SAPRC chemical mechanisms) 5) Speciation profiles 6) Spatial surrogates 7) Temporal profiles 8) Day-specific data for point sources 9) Integrated Transportation Network (ITN) (ARC for mat) 10) DTIM-ready files

4. Other Issues – On-Road Motor Vehicle Gridded Inv entory

Alpine Geophysics briefly described how the on-road gridded inventory was developed. First they developed an Integrated Transportation N etwork (ITN) that combines demand model networks from agencies such as MTC, SACOG, fo ur COGs in the San Joaquin Valley, and Caltrans’ statewide network. The VMT p rovided by each of these agencies was adjusted in three ways. First, the VMT were ad justed to represent the year 2000. For instance, the statewide network was for year 19 95 and was grown to reflect year 2000. Second, the VMT was adjusted to distinguish between weekday and weekend volumes. Third, Alpine Geophysics developed a mode l to add commercial VMT to the

ITN.

Alpine Geophysics compared the VMT for 2000 from th e ITN with EMFAC 2002. There were some discrepancies, which Alpine Geophysics un derstands and will document in a

“read me” file.

5. Plans for Next Meeting

The next conference call will focus on the on-road motor vehicle gridded inventory. The call is scheduled for Monday, April 7.

### ___________________________________________________ ___________________ A-6 

## April 7, 2003

Attendees Affiliation
Toch Mangat, Phil Martien Bay Area AQMD Charles Anderson, Matt Jones, Bruce Katayama, Greg Tholen, Brigette Tollstrup Sacramento Metro AQMD

Donald Hunsaker, David Nunes, Stephen Shaw, Evan Shipp, Michelle Stanley San Joaquin Valley Unified APCD

Harold Brazil MTC

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Vernon Hughes, Anne Lin, Cheryl Taylor, Ed Yotter A RB



### 1. Welcome and Feedback on March 19 Minutes

ARB welcomed everyone to the call. Introductions w ere made. There were no
comments on the March 19 minutes. The BAAQMD asked if the one-page summary that details the information that will be posted on the ftp site had been distributed (as referenced in the minutes). ARB responded that the summary had not been written yet.

2. Status of Ftp Site for Accessing Gridded Invento ries

Alpine Geophysics described the ftp site (not a web page) that they set up to transfer and track the review of the gridded inventories. T o access the information, ftp to agftp.com (host name). The user ID is agftp and th e password is pass4ftp.

To review emissions files, change to directory “CCA QS_Emissions”. There are subdirectories for three episodes: June 2000, July 20 00, and September 2000. Data are available under July 2000 for the July/August 2000 episode. Under the July 2000 subdirectory are five sub-directories: a) CEFS_files, b) Gridded_SAS_files, c) Modeling_Files, d) Plots and e) Summaries.

a) CEFS_files : Contains the actual files provided by the ARB’s Emission Inventory Branch as they come out of CEFS. b) Gridded_SAS_files : Contains the gridded SAS datasets in SAS trans f ormat.
This format allows SAS files to be transferred to v ersions of SAS running on different platforms (i.e. PC, Linux, Sun). Alpine Geophysics will include an example of SAS code that can be used to extract the transport files to your local systems. SAS will be required to access and use th ese files. The files are broken into source types: area, point, biogenics, on-road, and fires. There is a file for each source type and episode day. c) Modeling_Files : These are the model-ready files for input into S AQM and CAMx. Each model is run using both SAPRC and CBIV chemist ry. These files are further separated into source types (point, area, b iogenics, on-road, and fires). These are ASCII (text) format files. d) Plots : These are gif plots (not animated) showing hourl y and daily total emissions (kilograms per day) of NOx and ROG for po int, area, and on-road sources for August 1, 2000.

### ___________________________________________________ ___________________ A-7 e) Summaries : There are two reports. One shows county totals for point, area, and on-road. The second report shows point and area so urce emissions by county by EIC with day-specific data merged in.

Several additions will be posted to the ftp site so on. ARB will develop a one-page summary that will detail what information will be p osted on the ftp site. Alpine Geophysics will add a description of the file namin g convention. Alpine will post to the ftp site a data-tracking log that shows the current inventory, date released, problems identified, who identified the problem and when, ho w the problem was fixed, and who fixed the problem and when. The September 2000 poi nt and area source files are ready, so they will be posted to the ftp site. Emi ssions from soil NO will also be posted.

3. Gridded On-road Motor Vehicle Emissions

Alpine Geophysics distributed to the group a draft report (available on the ftp site) that describes how the gridded on-road motor vehicle inv entory was created. The report describes how the Integrated Transportation Network (ITN) for the entire CCOS/CRPAQS domain was developed. The report descr ibes the addition of a

commercial travel model to the ITN. It also descri bes how the day-specific data were used to create hourly VMT distributions and make ad justments for weekdays and weekend days. Please provide any comments to Jim W ilkinson (Alpine Geophysics).

4. Other Issues

The group asked how much time is available to revie w the gridded inventories. ARB has already begun modeling with the emission invent ories that have been developed, so any issues that are discovered will need to be a ddressed as soon as possible. Provide any comments or questions to Cheryl Taylor (cataylor@arb.ca.gov).

5. Plans for Next Meeting

The next conference call is scheduled for Wednesday , April 23.



## April 23, 2003

Attendees Affiliation
Toch Mangat, Phil Martien, Steve Soong Bay Area AQM D

Bob Nunes Monterey Bay Unified APCD Charles Anderson, Matt Jones, Bruce Katayama, Aleta Kennard, Hao Quinn, Greg Tholen Sacramento Metro AQMD

David Nunes, Stephen Shaw, Michelle Stanley San Joa quin Valley Unified APCD

Harold Brazil MTC

Cari Anderson Earth Matters Cyndi Loomis Alpine Geophysics Daniel Chau, Vernon Hughes, Doug Ito, Bruce Jackson

, Anne Lin, Tess Sicat, Cheryl Taylor, Eugene Yang, E d

Yotter ARB

### ___________________________________________________ ___________________ A-8 1. Welcome and Feedback on April 7 Minutes

ARB welcomed everyone to the call. Introductions w ere made. There were no comments on the April 7 minutes.

2. Status of Ftp Site for Accessing Gridded Invento ries

Alpine Geophysics described the status of the infor mation on the ftp site. Alpine has placed several items on the ftp site since the last call. 1) Alpine has added the point and area source files for the September 2000 episod e. 2) Alpine has placed an example of SAS code that can be used to extract the SAS transport files to your local system. This will enable you to review the gridded SAS files that are in SAS trans format. The file on the ftp site is called “exampl e_import.sas”. 3) Alpine has placed a program to convert ASCII to binary that will allow the modeling files to be imported into PAVE, as requested by Sac Metro AQMD. The program on the ftp site is called “binary_convert.tar.gz”. [Note: To access the inf ormation, ftp to agftp.com (host name). The user ID is agftp and the password is pass4ftp. The emission information can be found under the directory “CCAQS_Emissions”. A det ailed description of the contents of the CCAQS_Emissions directory can be found in th e April 7 minutes.]

Several additions will be posted to the ftp site so on. 1) Alpine will place an overview document that describes what information is posted on the ftp site. 2) Revised on-road motor vehicle and biogenic emissions for the July/A ugust episode will be posted soon. These emissions were recalculated using different m eteorological data. 3) Alpine will add a description of the file naming convention. 4 ) Alpine will post to the ftp site a datatracking log that shows the current inventory, date released, problems identified, who identified the problem and when, how the problem wa s fixed, and who fixed the problem and when. 5) Emissions from soil NO will also be p osted. 6) Spatial surrogate information (report and graphics) will be posted. 7) The results of a CCOS project to update specific district area source categories wil l be available. 8) Future year emissions will be posted when they become available

.

BAAQMD stated that they would be revising emission and stack data for refineries. Sac Metro AQMD raised questions about inconsistencies i n the summary reports. ARB also expressed concerns about discrepancies in county to tal emissions between the summary reports on the ftp site with reports run in -house by ARB. ARB will work with Alpine to correct and clarify the summary reports. Sac Metro AQMD also expressed concern that their day-specific emissions didn’t ap pear to be incorporated correctly. ARB will work with the district and Alpine to ensur e the inclusion of the day-specific

data.

3. Comments on Alpine Geophysics’ Report on the Int egrated Transportation

Network

The group provided comments on the draft report (av ailable on the ftp site) that describes how the gridded on-road motor vehicle inv entory was created using the Integrated Transportation Network (ITN). ARB noted that they are working with the

### ___________________________________________________ ___________________ A-9 COGs to specifically define the hours in the am/pm peaks for their region. ARB will work with Alpine to incorporate any corrections nee ded to the motor vehicle emission calculations. SJVUAPCD expressed concern about Cal trans’ statewide network being

used for their four northern counties rather than l ocal data. Earth Matters, who represents the valley COGs, will work with ARB and Alpine to look into acquiring local network data. SJVUAPCD also noted that the ITN rep resents reality fairly well in the urban areas, but can be off by more than a grid cel l in more remote areas like the foothills. Also, Earth Matters sent questions abou t the commercial travel model that Alpine included; ARB and Alpine will discuss the qu estions on a separate call. Please provide any additional comments to Jim Wilkinson (A lpine Geophysics).

4. Other Issues

No other issues were discussed.

5. Plans for Next Meeting The next conference call is scheduled for Wednesday , May 7.



## May 7, 2003

Attendees Affiliation
Toch Mangat, Phil Martien, Amir Fanai Bay Area AQMD

Bob Nunes Monterey Bay Unified APCD Matt Jones, Greg Tholen Sacramento Metro AQMD Donald Hunsaker, David Nunes, Evan Shipp San Joaqui n Valley Unified APCD

Harold Brazil MTC

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics

Leonard Seitz Caltrans Paul Allen, Daniel Chau, Vernon Hughes, Doug Ito, B ruce Jackson, Anne Lin, Cheryl Taylor, Bruce Tuter, Ed Y otter ARB



### 1. Welcome and Feedback on April 23 Minutes

ARB welcomed everyone to the call. Introductions w ere made. There were no comments on the April 23 minutes.

2. Status of Ftp Site for Accessing Gridded Invento ries

Alpine Geophysics described the status of the infor mation on the ftp site. Alpine has placed several items on the ftp site since the last call:

a) Alpine has posted modeling files that reflect re vised on-road motor vehicle and biogenic emissions using CALMET temperatures (highe r temperatures) for the July/August 2000 episode. The on-road emissions in creased about 10-20% and the biogenic emissions increased about 30% from the previous version. It was noted that the on-road emissions were adjusted so t hat the county totals match

the emissions from EMFAC2002 v2.2. These emissions were spatially allocated

### ___________________________________________________ ___________________ A-10 using the output from DTIM, which uses the ITN acti vity as input, to create hourly emission ratios for each grid cell in a county. The revised files contain “revmet”

in the name.

b) Alpine has posted new summaries of emissions by county and by category (EIC3 level) for point and area sources. The new summari es reflect the correction to the EIC mapping that was causing some point and area so urce emissions to be dropped. The summaries also reflect a clearer acco unting of the processing that occurred from the CEFS output files to the SAS grid ded files (e.g. some ag burn emissions are dropped because no burning occurred o n the episode day). Close attention should be paid to the files names in orde r to retrieve the latest version; the revised summaries have V050503 (Version dated May 5 , 2003) added to the file

name.



### c) Alpine has posted point and area source model-re ady files (SAPRC format) for January 2001.

d) Alpine has placed the EMS-95 Technical Formulati on Documentation on the ftp site under the directory "EMS-95 Technical Formulat ion Documentation". These

are old WordPerfect files that should load into new er versions of WordPerfect and probably into Word. Much of this same informat ion is available on-line at ww.ladco.org/emis/guide/ems95.html.

e) The Emission Inventory Branch at ARB has develop ed a website with information regarding SIP Baseline Emission Inventory Projectio ns. The site contains report generators for annual average, seasonal average pla nning, and modeling

inventories. There are sections on control rule re ports, documentation, and memoranda. This site should be helpful in checking the summary reports from CEFS that are posted on the ftp site. The address is http://www.arb.ca.gov/app/emsinv/ccos/index.php

f) Spatial data are now available on the ftp site. The reports and plots created by Sonoma Technology Inc. (STI) are available for revi ew. A "read me" file describes the files. The directory is called "CCOS I_STI".

g) Future year surrogate information is also availa ble from STI. It is in the directory "NewSurrogates_STI".

h) The results of the project to update specific di strict area source categories for small districts in the Mountain Counties, Sacrament o Valley, and Mendocino can be found in the directory "CCOSII_STI". A "read me " file describes where to find

the information.

The BAAQMD noticed as they reviewed the plots that the southern portion of the domain had a different timing for when motor vehicl e emissions began than the rest of the domain. ARB is having on-going discussions wit h the COGs about the definition of “peak hour”. There are multiple period definitions for different networks. ARB is

### ___________________________________________________ ___________________ A-11 working with Alpine to ensure that the actual hours as defined by am, pm, and off-peak periods are reflected correctly on the Integrated T ransportation Network (ITN). The
BAAQMD has also created animations of the NOx and T OG plots for on-road motor vehicles and volunteered to post them on the ftp si te.

The group discussed the labeling information on the plots. The units are in kg/grid cell for each hour. The time shown is local time (PDT f or July 2000). Alpine will check the labels to make sure that the units and a descriptio n of the plot are displayed.

3. Comments on Alpine Geophysics’ Report on the Int egrated Transportation

Network

Alpine Geophysics received two sets of comments on the draft ITN report. Alpine will draft responses to the comments.

Additionally, the San Joaquin Valley Unified APCD a nd Earth Matters had expressed concern in previous meetings that the ITN uses the statewide model for the four northern counties in the San Joaquin Valley. The SJVUAPCD i s continuing to study the ITN in the northern SJV to determine if the ITN is acceptable as a replacement for local data. The SJVUAPCD and Earth Matters expressed acceptance of the ITN for use in the SIPs. Earth Matters expressed acceptance of the ITN for use in the SIPs. The SJVUAPCD is still discussing in-house the acceptability of the ITN. ARB and SJVUAPCD will discuss the subject further during the next weekly modeling cal l. Earth Matters agreed to work with ARB to provide updated data for all eight counties in the SJV. There is not sufficient time to incorporate these data into the ITN for use in the upcoming SIPs. Perhaps they can be used for future work, such as transport analysis.



### Monterey Bay Unified APCD expressed surprise that l ocal transportation data were not used for the Monterey area since they believe that data were available. AMBAG did not respond to the original request for data from Alpin e. Monterey Bay district will look into what data are currently available.

Caltrans noted that they would have a new statewide model available soon that will represent calendar year 2000.

4. Other Issues

Earth Matters had a question about the TOG emission s for area sources in the San Joaquin Valley. They compared the August 1, 2000 i nventory with an average summer day inventory and noticed a large difference (about 1100 tpd). ARB will look into the question.

5. Plans for Next Meeting

The next conference call is scheduled for Wednesday , May 21.

### ___________________________________________________ ___________________ A-12 

## May 21, 2003

Attendees Affiliation
Toch Mangat, Phil Martien, Amir Fanai Bay Area AQMD

Bob Nunes Monterey Bay Unified APCD Charles Anderson, Matt Jones, Bruce Katayama, Aleta Kennard, Greg Tholen Sacramento Metro AQMD

David Nunes, Evan Shipp, Michelle Stanley San Joaqu in Valley Unified APCD

Harold Brazil MTC

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics

Leonard Seitz Caltrans Ravi Ramalingam, Cheryl Taylor, Ed Yotter ARB



### 1. Welcome and Feedback on May 7 Minutes

ARB welcomed everyone to the call. Introductions w ere made. There were two comments on the May 7 draft minutes. The SJVUAPCD did not agree with the

statement in Section 3 “The SJVUAPCD and Earth Matters expressed acceptanc e of

the ITN for use in the SIPs.” The SJVUAPCD is still discussing in-house the acceptability of the ITN. ARB and SJVUAPCD will di scuss the subject further in the next weekly modeling call.

Caltrans questioned the following statement on the ITN in Section 2, part 1): “These emissions were spatially adjusted using VMT on the Integrated Transportation Network (ITN).” This statement incorrectly reflected what was said at the meeting. The

statement should read “These emissions were spatially allocated using the output from DTIM, which uses the ITN activity as input, to crea te hourly emission ratios for each grid cell in a county.” After discussing the spatial distribution of the e missions, Caltrans was

satisfied with the method. ARB will correct the mi nutes to reflect these comments.

2. Data on Ftp Site

Alpine Geophysics described the information posted to the ftp site since the last call. [To access the site, ftp to agftp.com (host name). The user ID is agftp and the password is pass4ftp.] Since there have been sever al revisions to some of the files, Alpine has created a Version_Control_Log (found und er CCAQS_Emissions/July 2000/Modeling_Files) that describes the reason for each revision and the revision number. This log will be very helpful in understan ding what is in each file.

a) Alpine posted revised point and area source file s for the July/August 2000 episode that reflect corrections in the processing of the CEFS output files. There are revised summaries (emissions by county as well as emissions by county and EIC category). There are revised modeling files. All the summaries and modeling files for the revised point and area sourc es contain the date the version was revised, V050503.

### ___________________________________________________ ___________________ A-13 b) There have been changes to the list of species i n both the CB-IV and SAPRC chemistries. These changes relate to whether certa in species are treated explicitly or are lumped together with other specie s. The species are methanol (MEOH), ethanol (ETOH), MTBE, and methyl butanol (M BUT). The BAAQMD reminded all that changes to the speciation will ca use the modeling files to change, but not the base CEFS files and plots.

Alpine noted that there are several outdated versio ns of files on the ftp site that could cause confusion to reviewers. They asked if the fi les could be deleted. ARB requested that the files be moved to a different directory to lessen confusion, but retained for now. Alpine will look into creating a subdirectory for o utdated versions. Space on the ftp site may become a concern.

SMAQMD expressed concern that the day-specific emis sions may not be processed correctly for begin hour codes of “-1”, which indic ate that the emissions are in kg/day rather than kg/hour. This may cause the emissions to be underestimated. ARB will investigate.

BAAQMD noted that some of the day-specific data rec ently submitted for the Bay Area contained emissions for only certain hours of the d ay, not the entire day. Following a discussion with Alpine on the methodology for proce ssing the data, BAAQMD was satisfied that the data are being processed correct ly.

3. Comments on Alpine Geophysics’ Report on the Int egrated Transportation

Network

Alpine Geophysics has placed the raw data files tha t they used to create the ITN on

their FTP site. Each network is contained in its o wn zip file. The zip files are located in the directory "ITN_2000/Raw Data Used To Develop IT N." The name of the zip files

states their relation to the network. ARB noted th at the SACOG file was missing; Alpine will post Sacramento to the ftp site.

Alpine also posted a zip file on the FTP site that contains all the documentation and supporting data sets for the gravity model used in the Integrated Transportation Network (ITN). The file is called “ucd_gravity.zip” and is located in the "ITN_2000/Commercial VMT Gravity Model" directory. The gravity model es timates commercial VMT based on trip counts for 2, 3, 4, and 5 axle vehicles. The model uses AADT data from Caltrans and apportions trip counts across the domain. Alpi ne noted that the commercial VMT using the gravity model was only applied to the por tions of the ITN developed with the Caltrans statewide model; local transportation netw orks already include commercial

VMT.

Alpine plans to provide a draft final version of th e ITN report on May 23. Alpine will notify the group when the report is available.

Earth Matters asked when Alpine would be responding to their questions about the ITN. Alpine hopes to complete their response by the end of the week.

### ___________________________________________________ ___________________ A-14 Earth Matters asked if ARB still wants the latest C OG data since it may not be used in the ITN for SIP modeling. ARB would like the data since ARB is creating its own ITN for uses other than SIP modeling. The alternate ITN wo uld be on a different grid system than CCOS, using a Teale Albers projection. Earth Matters said they would request the

data from the TPAs.

The BAAQMD mentioned that the time profiles in the on-road inventory of the modelready files show a noontime “dip” in emissions on t he weekend. Alpine pulled up the data and said that the “dip” is caused by the day-s pecific data that were developed by

Dr. Niemeier of UC Davis. The data show a 1-2 hour decrease in emissions around noon and then a return to previous levels. Alpine will post the UC Davis information to the ftp site. Alpine will also post information th at was generated to QA the ITN that may be helpful to other reviewers.

4. Other Issues

No other issues were raised.

5. Plans for Next Meeting

The next conference call is scheduled for Wednesday , June 4.



## June 4, 2003

Attendees Affiliation

Phil Martien, Amir Fanai Bay Area AQMD Charles Anderson, Matt Jones, Bruce Katayama, Greg

Tholen Sacramento Metro AQMD

David Nunes, Stephen Shaw, Michelle Stanley, Jim Sw eet San Joaquin Valley Unified APCD

Harold Brazil MTC

Leonard Seitz Caltrans

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Paul Allen, Vernon Hughes, Tess Sicat, Cheryl Taylo r, Bruce Tuter, Ed Yotter ARB



### 1. Welcome and Feedback on May 21 Minutes

ARB welcomed everyone to the call. Introductions w ere made. The May 21 and revised May 7 minutes were approved as written.

2. Data on Ftp Site

Very little new information was posted to Alpine Ge ophysics ftp site since the last call. [To access the site, ftp to agftp.com (host name). The user ID is agftp and the password is pass4ftp.] When reviewing the various files on the ftp site, check the Version Control Log to determine the version you wi sh to review. The

### ___________________________________________________ ___________________ A-15 Version_Control_Log (found under CCAQS_Emissions/Ju ly 2000/Modeling_Files)

describes the reason for each revision and the revi sion number.

Alpine will be posting revised area and point sourc e modeling files. A small amount of emissions were being left out because some SIC/SCC combinations were missing a speciation profile assignment. Alpine and ARB shou ld have the problem corrected

soon.

In previous meetings, SMAQMD expressed concern that the day-specific emissions may not be processed correctly for begin hour codes of “-1”, which indicate that the emissions are in kg/day rather than kg/hour. This may cause the emissions to be underestimated. SMAQMD also expressed concern that emissions reported for multiple hours (rather than a single hour at a time) were be ing treated for only the first hour. Alpine and ARB investigated the concerns and discov ered that SMAQMD was correct. Alpine modified the program to read multiple hours and reformatted the emissions reported with a “-1” to be hourly emissions. The d ay-specific emissions are now being processed correctly.

3. Comments on Integrated Transportation Network (I TN) Report

Alpine hopes to complete the draft final ITN report by June13. The group will be notified

when it is available for review.

Alpine provided a response on June 3 to comments su bmitted by Earth Matters on the ITN report. Earth Matters said that they had a cou ple of questions (editorial comments) about the response. Earth Matters plans to talk to the San Joaquin Valley APCD (SJVUAPCD) and provide a response to Alpine and ARB the week of June 9. Alpine plans to include the response to Earth Matters’ com ments in the ITN report.

The SJVUAPCD staff continued to express concern abo ut the statewide network being

used for the four northern counties of the SJV rath er than local transportation networks

in the ITN. SJVUAPCD staff has raised the concern to their management. [As a reminder, Stanislaus provided information that coul dn’t be incorporated and the other three counties did not respond at the time when Alp ine gathered the local data for use in the ITN.]

Earth Matters will continue to work with Ed Yotter to provide local networks to the ARB.

At the last meeting, the BAAQMD mentioned that the time profiles in the on-road inventory of the model-ready files show a noontime “dip” in emissions on the weekend. Alpine mentioned that the “dip” is caused by the da y-specific data that were developed by UC Davis. The BAAQMD reminded Alpine to post in formation that was used to QA the ITN, which may be helpful to other reviewers. Alpine will post the information. The BAAQMD also posted animations showing diurnal profi les of Bay Area traffic counts on the ftp site under CCAQS_Emissions\July 2000\Animat ions.

### ___________________________________________________ ___________________ A-16 4. Other Issues

No other issues were raised.

5. Plans for Next Meeting

The next conference call is scheduled for Wednesday , June 25.



## June 25, 2003

Attendees Affiliation
Charles Anderson, Matt Jones, Bruce Katayama, Greg Tholen, Brigette Tollstrup Sacramento Metro AQMD

David Nunes, Stephen Shaw, Michelle Stanley, Jim Sw eet San Joaquin Valley Unified APCD

Bob Nunes Monterey Bay Unified APCD Wayne Luney Caltrans Headquarters Sally Rodeman Caltrans, District 10

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Chris Emery Environ Vernon Hughes, Tess Sicat, Cheryl Taylor, Ed Yotter ARB



### 1. Welcome and Feedback on June 4 Minutes

ARB welcomed everyone to the call. There were two c omments on the June 4 minutes. First, the minutes stated “Earth Matters will conti nue to work with Ed Yotter to provide

local networks to the ARB.” Earth Matters noted th at ARB has stated that they are not ready to collect networks at this time. Second, Ea rth Matters expressed concern about the statement in Section 3: “[As a reminder, Stanis laus provided information that couldn’t be incorporated and the other three counti es did not respond at the time when Alpine gathered the local data for use in the ITN.] Earth Matters thought it might be better to say that local data were used for four of the eight counties in the SJV.

2. Data on Ftp Site

Alpine Geophysics reported that information for the September 2000 episode is available on the ftp site. [To access the site, ft p to agftp.com (host name). The user ID is agftp and the password is pass4ftp.] CEFS outpu t files, summaries, plots, intermediate SAS files, and modeling files are avai lable for review.

The temperature and relative humidity fields used t o calculate the on-road motor vehicle and biogenic emissions have been posted to the ftp site.

Revised CEFS files (base year and future years) hav e been provided by ARB for the July/August 2000 episode. Alpine is processing the se emissions to create modeling files for 2005, 2006, 2007 and 2010. Alpine will p ost these files to the ftp site this week and will generate several reports, including emissi on summaries by county and EIC as well as summaries of speciated emissions for each e pisode day.

### ___________________________________________________ ___________________ A-17 ARB is developing the gridded on-road motor vehicle files for the future years needed for the July/August 2000 episode. ARB plans to pro vide these files next week to Alpine, who will speciate the emissions.

In previous meetings, SMAQMD expressed concern that some of the day-specific emissions were not being processed correctly. The problems have now been corrected. The day-specific data are being incorporated correc tly as the inventories are being reprocessed with the latest emission data.

The June 4 minutes reported a small underreporting of emissions due to missing speciation profile assignments. This problem has n ow been corrected. Additionally, ARB has provided Alpine with speciation profiles fo r all the future years.

SJVUAPCD asked whether the modeling emission files reflect Pacific Daylight Time (PDT) or Pacific Standard Time (PST). ARB responde d that emissions are usually handled in PDT because the temporal profiles of bus iness activities follow local time (e.g. a business starts operating at 8 am, regardle ss of which time base it is). Air quality modelers need to be aware that they may need to con vert emission data from PDT to

PST.

3. Comments on Integrated Transportation Network (I TN) Report

Alpine Geophysics is working on the draft final ITN report. The group will be notified

when it is available for review.

Previously, Alpine provided a response to comments submitted by Earth Matters on the ITN report. Earth Matters provided verbal comments to ARB. ARB will work with Alpine to incorporate the comments. Alpine plans to inclu de the response to Earth Matters’ comments in the ITN report.

SJVUAPCD continued to express concern about the sta tewide network being used for

the four northern counties of the SJV rather than l ocal transportation networks in the

ITN. SJVUAPCD would like to see all the local SJV networks included in the ITN in time for modeling work to develop future year control st rategies for the 1-hour ozone SIP. SJVUAPCD is considering options to provide an updat ed ITN for all or part of the SJV, perhaps by the middle of July. SJVUAPCD will discu ss a course of action for improving the ITN with ARB when a decision has been made, hop efully by the end of the week. The entire group agreed that it is important to kee p moving forward to update the ITN.

ARB noted that there is insufficient time to update the ITN and recreate the motor vehicle inventories in time for base year model per formance, as it will be completed shortly. ARB reminded the group that the ITN is on ly used as a sophisticated spatial surrogate; emission estimates for each county come from EMFAC. ARB suggested that

the difference between the local networks and the s tatewide network could be assessed. This could be done in GIS by overlaying the 4 kilometer modeling grid over a local network and summing the VMT by grid cell. Th e result could be compared to the

### ___________________________________________________ ___________________ A-18 sum of the VMT by grid cell from overlaying the mod eling grid over the statewide network. Comparing the VMT by grid cell would quan tify the difference between the local and statewide networks to see if the spatial distribution would be changed significantly.

Alpine Geophysics will be providing training on how the ITN was developed to ARB and other interested parties in Sacramento on July 1, 2 , and 3. SJVUAPCD and Earth Matters requested information on the training.

There was some discussion about how each period (fo r example, am and pm peaks) was distributed on the ITN. Alpine agreed to post a table on their ftp site that lists each county and the hours that each period represents. This table was developed based on data that were provided to Alpine by the local tran sportation agencies.

As requested at the June 4 meeting, Alpine posted o n their ftp site a comparison of weekday and weekend VMT for each county between the UC Davis data, the ITN data, and the DTIM data. The BAAQMD had previously noted that the time profiles in the onroad inventory showed a noontime “dip” in emissions on the weekend, which reflected the day-specific data that were developed by UC Dav is.

4. Other Issues

No other issues were raised.

5. Plans for Next Meeting

The next conference call is scheduled for Wednesday , July 9.



## July 30, 2003

Attendees Affiliation
Phil Martien, Toch Mangat Bay Area AQMD Charles Anderson, Bruce Katayama, Greg Tholen Sacra mento Metro AQMD David Nunes, Stephen Shaw, Michelle Stanley, Jim Sw eet San Joaquin Valley Unified APCD

Leonard Seitz Caltrans Headquarters

Cari Anderson Earth Matters Cyndi Loomis Alpine Geophysics Vernon Hughes, Tess Sicat, Cheryl Taylor, Bruce Tut er ARB



### 1. Welcome and Highlights of July 9 Meeting

ARB welcomed everyone to the call. ARB summarized the items discussed at the July 9 meeting. The following paragraph will serve as t he minutes of the July 9 meeting.

July 9 Meeting Highlights

Participants represented the Bay Area, Sacramento a nd San Joaquin districts, Alpine Geophysics, and ARB. Alpine stated that they are p roducing future year modeling

### ___________________________________________________ ___________________ A-19 inventories for the CCOS base case modeling for the July/August 2000 and September 2000 episodes. Alpine staff are also producing bas e year and future year modeling inventories for the July 1999 episode for the Bay A rea AQMD and the August 2002 episode for the Sac Metro AQMD. Alpine is progress ing on the final ITN report. The Bay Area mentioned that they had reviewed the data regarding the period definition spreadsheet that Alpine had posted on their ftp sit e (see the June 15 minutes).

2. Update on Status of Gridded Inventory

Alpine Geophysics reported on the status of the gri dded inventories. ARB provided revised point and area source CEFS files for all ep isodes to Alpine on July 10. Alpine has reprocessed the CEFS files to create revised mo deling files for point and area sources. The files are for the base year and futur e years for the July/August 2000, September 2000, and August 2002 episodes. The file names will contain “V071003_R001”. The revised future year files were inadvertently placed under the CCAQS_Emissions/July_2000/Modeling_Files directory, rather than the CCAQS_Emissions/July_Aug_FY/Modeling_Files director y. Alpine will generate summary reports when time is available.

Regarding the status of on-road motor vehicle emiss ions, the modeling files for 2005 and 2006 for the July/August episode will be ready on August 4. ARB will be providing files for 2010 to Alpine for processing in the next two to three weeks. ARB will also be providing files for all future years for the Septem ber 2000 episode to Alpine for processing in the next two to three weeks. Modelin g files for the base year September 2000 episode are posted on the ftp site.

The point, area, and biogenic files for the July 19 99 episode (base year) will be completed and posted the week of August 4. The mot or vehicle files will be ready the following week.

The version control log has been updated to reflect the available files (found under CCAQS_Emissions/July_2000/Modeling_Files). The ver sion control log also describes

the various versions of the CBIV and SAPRC chemical mechanisms. Please check the version control log for a description of each model ing file.

3. Update on Wildfire Emissions

ARB reported that at the last CCOS Technical Commit tee (TC) meeting, Gail Tonnesen of UCR mentioned that the day-specific wildfire emi ssions (in particular, the Manter fire in southeast Tulare County) had a large effect on m odel performance. The TC asked how the emissions were being treated in the model a nd if anyone had information on alternative methods that could be used, particularl y in distributing the emissions vertically. UC Berkeley’s Center for the Assessmen t and Monitoring of Forest and Environmental Resources (CAMFER) laboratory calcula ted the emissions in consultation with ARB’s Emission Inventory Branch. [More information on CAMFER can be found at: http://camfer.cnr.berkeley.edu/fi re/]. Vertical stratification of emissions was done using a method developed for the Fire Emis sions Joint Forum (FEJF) of the

### ___________________________________________________ ___________________ A-20 Western Regional Air Partnership (WRAP). ARB will distribute these methodologies to the group and post them on Alpine’s ftp site. The group was asked to provide any additional information they may have.

4. Other Issues

ARB will contact Alpine Geophysics to estimate a da te for the availability of the final ITN report; ARB will notify the group.

Caltrans staff asked about the purpose of the ITN t raining that Alpine gave in early July. ARB explained that the contract with Alpine specifi ed that Alpine would provide handson training to ARB. The purpose was to allow ARB t o understand firsthand the method used to develop the ITN and to do a technology capt ure for future use by ARB.

Caltrans staff asked about any efforts to coordinat e/organize future updates to a new ITN, such as incorporating a revised state travel m odel or more local COG data. No formal coordination has been established; however s taff at ARB and Caltrans seemed willing to keep the lines of communication open.

Bay Area staff mentioned that they had reviewed the hourly profiles developed by UC Davis and noticed that cars and trucks were lumped together. ARB reported that UCD did not have sufficient data to warrant the develop ment of distinct hourly profiles that were statistically significant.

San Joaquin Valley staff asked if day-specific trai n data were included in the CCOS modeling. SJV staff recalled that train traffic wa s closed west of the mountains between the ocean and valleys during the July/August 2000 e pisode that may have increased the number of trains operating in the valley. ARB and SJV will investigate sources of

information.

San Joaquin Valley staff requested that ARB provide the day-specific data that were used in CCOS modeling, for documentation purposes. ARB will send the data.

5. Plans for Next Meeting

The next conference call is scheduled for Wednesday , August 13.

### ___________________________________________________ ___________________ A-21 

## August 13, 2003

Attendees Affiliation

Phil Martien Bay Area AQMD Charles Anderson, Matt Jones, Bruce Katayama, Greg

Tholen Sacramento Metro AQMD

David Nunes, Stephen Shaw, Michelle Stanley, James

Sweet San Joaquin Valley Unified APCD

Harold Brazil MTC

Leonard Seitz Caltrans Headquarters

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Chris Emery Environ Vernon Hughes, Tess Sicat, Cheryl Taylor, Ed Yotter ARB



### 1. Welcome and Feedback on July 30 Meeting

ARB welcomed everyone to the call. ARB summarized the items discussed at the July 9 meeting. The July 30 minutes were approved as written, with one clarification. The version control log (described in Section 2) ap plies specifically to the July/August 2000 episode, although the naming convention of the files is consistent between episodes.

2. Update on Status of Gridded Inventory

Alpine Geophysics reported on the status of the gri dded inventories:

July/August 2000 episode – Point and area source modeling files are complet ed for the base year and future years (2005, 2006, and 2010). Biogenics files are completed. Onroad motor vehicle files are completed except 2010, which should be ready next week.

September 2000 episode – Point and area source modeling files are complet ed for the base year and future years (2005, 2006, and 2010). Biogenics files are completed. Onroad motor vehicle files are available for the base year. Alpine said that the future year files for on-road motor vehicles are completed; the y will double-check since they are not posted on the ftp site.

July 1999 episode – Point, area, and biogenic modeling files are com pleted for the base year. On-road motor vehicle files for the base yea r are currently being processed.

August 2002 episode – Point and area source modeling files are complet ed for the base year and future years (2005, 2007, 2008, 2010, 2012 , and 2018). Biogenics files are completed. On-road motor vehicle files for the bas e year will be completed in the next week, and subsequently followed by each future year every 2 or 3 days.



### 3. Discussion of Wildfire Emissions

As mentioned on the July 30 call, ARB reported that Gail Tonnesen of UCR mentioned at the last CCOS Technical Committee (TC) meeting t hat the day-specific wildfire

### ___________________________________________________ ___________________ A-22 emissions (in particular, the Manter fire in southe ast Tulare County) had a large effect on model performance. In particular, Gail expresse d concern that the emissions from the Manter fire were not distributed nearly high en ough (i.e. there were not enough emissions aloft). The TC asked how the emissions w ere being treated in the model and if anyone had information on alternative methods th at could be used, particularly in distributing the emissions vertically. UC Berkeley ’s CAMFER laboratory calculated the

emissions in consultation with ARB’s Emission Inven tory Branch. Vertical stratification of emissions was done using a method developed for the Fire Emissions Joint Forum of the WRAP. Alpine Geophysics provided a document th at described the development of stack parameters and vertical distributions for mod eling large wildfires in the CCOS domain. ARB distributed these methodologies to the group and posted them on Alpine’s ftp site.

The group discussed the methodology for distributin g emissions vertically, based on the

information mentioned above. The vertical distribu tion of emissions is determined by the size of the fire. Members of the group express ed concern that the method that Alpine used limited the size of the fire to the num ber of acres in a 4 kilometer grid cell,

and therefore limited the vertical distribution. A lpine agreed to revisit the methodology using the entire size of the fire for the day.

The group also discussed wildfire emissions in futu re year inventories, which are not normally included. ARB will put together some init ial thoughts on a protocol to handle wildfire emissions in future year modeling.

4. Biogenic Emissions

Alpine Geophysics received biogenic emissions from ARB for the January 2000 episode. Alpine requested the precise date, start times, and time coordinates for that episode. ARB will provide that information.

Bay Area staff asked about the VOC emissions on Aug ust 1 of the July/August 2000 episode since they appeared different than the othe r days of the episode. They stated that the emissions are fairly high at night and the re was a dip in the emissions about 1 p.m. across the entire domain. Bay Area staff agre ed to post animations of the biogenic emissions for August 1. Alpine mentioned that the temperature fields used to calculate the emissions are posted on the ftp site. Staff fr om the Bay Area, Alpine Geophysics, and ARB agreed to look at the temperature fields an d the biogenic emissions. The group was reminded that isoprene and methylbutenol (MBO) emissions are sensitive to light and temperature, whereas monoterpene emission s are only sensitive to
temperature.

ARB mentioned that SJV staff has expressed concern about the latest biogenic emissions since they are very different than the bi ogenic estimates made during

SARMAP. ARB will discuss the concern further with SJV staff.

### ___________________________________________________ ___________________ A-23 5. Other Issues

After receiving the day-specific data requested fro m ARB, San Joaquin Valley staff commented that they had not provided day-specific d ata for CRPAQS. SJV staff will investigate what information they can provide.

Bay Area staff requested conversion programs betwee n latitude/longitude, UTM coordinates, and Lambert Conformal coordinates. Al pine Geophysics and Environ agreed to work with the Bay Area to provide convers ion programs.

6. Plans for Next Meeting

The next conference call is scheduled for Wednesday , September 3.



## September 3, 2003

Attendees Affiliation
Phil Martien, Toch Mangat, Amir Fanai Bay Area AQMD Charles Anderson, Matt Jones, Bruce Katayama, Greg

Tholen Sacramento Metro AQMD

David Nunes, Stephen Shaw San Joaquin Valley Unifie d APCD

Leonard Seitz Caltrans Headquarters

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Vernon Hughes, Tess Sicat, Cheryl Taylor, Bruce Tut er, Ed

Yotter ARB



### 1. Welcome and Feedback on August 13 Meeting

ARB welcomed everyone to the call. The August 13 m inutes were approved as written.

2. Update on Status of Gridded Inventory

ARB shared with the group a tracking sheet that sho ws the status of CCOS and CRPAQS modeling inventories. The group suggested c hanges and updates. ARB will send out this sheet along with the agenda for futur e conference calls.

Alpine Geophysics reported on the status of the gri dded inventories:

July 1999 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year. Biogenics modelin g files for the base year are also used as is for all future years (this applies to al l episodes). Point and area modeling files for future years should be available next wee k. On-road motor vehicle files are available for 2005 and 2007. The group discussed w hich future years were needed for modeling; there was agreement on 2005, 2006, 20 07 and 2010.

### ___________________________________________________ ___________________ A-24 July/August 2000 episode – Point and area source modeling files are complet ed for the base year and future years (2005, 2006, and 201 0). Biogenics files are completed. On-road motor vehicle files are availab le for all years.

September 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year and future years (2005, 2006, and 2010).

August 2002 episode – Point and area source modeling files are complet ed for the base year and future years (2005, 2007, 2008, 2010, 2012, and 2018). Biogenics files are completed. On-road motor vehicle files f or 2002, 2005, 2007, and 2008 are completed; the remaining future years are planned f or completion next week.

3. Discussion on Wildfire Emissions

After discussion at the previous meeting, Alpine Ge ophysics revised the methodology for calculating the vertical distribution of fire e missions based on the entire size of the fire for the day rather than limiting the size of t he fire to the number of acres in a 4 kilometer grid cell. The revised files are availab le on Alpine’s ftp site.

Various members of the group have gathered informat ion on wildfires. Staff from the San Joaquin Valley and Bay Area agreed to send ARB information, who will distribute it to the group. Alpine recently presented informatio n on wildfires that occurred during the July 1999 and July/August 2000 episodes; ARB will a lso distribute this to the group.

The group also discussed wildfire emissions in futu re year inventories. ARB will present information gathered about wildfire emissions at a future conference call of either this group or an all-district modeling call. ARB will a lso put together some initial thoughts on a protocol to handle wildfire emissions in future y ear modeling.

4. Biogenic Emissions

Bay Area staff asked about the VOC emissions on Aug ust 1 of the July/August 2000 episode since they appeared different than the othe r days of the episode. In particular, the emissions are fairly high at night and there wa s a dip in the emissions about 1 p.m. across the entire domain. Alpine Geophysics and AR B agreed to look at the biogenic emissions and the temperature fields used to develo p the emissions.

ARB has two documents related to biogenic emissions that they will distribute to the group. The first is a one-page overview of biogeni c VOC emissions using the BEIGIS model. The second is a detailed description of the development of a biogenic hydrocarbon emission inventory for CCOS.

Alpine estimated biogenic NO emissions. These emis sions were added to the emissions estimated by ARB using BEIGIS for the Jul y 1999, August 2002, and July/August 2000 episodes. Biogenic NO has not bee n added to the September 2000

### ___________________________________________________ ___________________ A-25 episode. ARB will add a column for biogenic NO to the tracking sheet for SIP modeling

inventories.

Alpine used a soil NO algorithm found in BEIS-3 to estimate biogenic NO for modeling purposes. This estimate is about double a previous estimate from UC Berkeley, which is within the uncertainty of the estimation techniq ue. ARB is looking into potential data

sources or methods that could be used to validate t he emission estimates, such as using California-specific data.

5. Other Issues

Alpine Geophysics mentioned that they hoped to resu me work on the final Integrated Transportation Network (ITN) report soon; a final p roduct is possible in the next two

weeks.

Earth Matters asked if updates to VMT on local tran sportation networks would be used since the final modeling inventories will soon be c ompleted. ARB replied that updates to the VMT could result in changes to EMFAC. For t he development of on-road motor vehicle modeling inventories, the ITN is used as a surrogate to spatially distribute

EMFAC emissions. Revised emission estimates from E MFAC could be used in developing attainment targets over the next few mon ths. Earth Matters will be sending a letter to ARB providing updates to VMT for the SJ V COGs.

Staff from the Bay Area informed the group that Dr. Rob Harley (UCB) recently completed a draft report that applies a fuel-based emissions inventory method to estimate CO, NOx, and NMOC on-road motor vehicle em issions in the Sacramento Valley, San Joaquin Valley, and the Bay Area. In t he report, the fuel-based method is compared to EMFAC totals for the same areas. ARB w ill distribute the report to the

group.

It was noted that the emissions summaries produced by Alpine Geophysics have not been updated to reflect revisions to the modeling i nventories, especially for the July/August 2000 episode. Alpine will rerun emissi on summaries, as time becomes

available.

6. Plans for Next Meeting

The next conference call is scheduled for Wednesday , September 17.

### ___________________________________________________ ___________________ A-26 

## September 17, 2003

Attendees Affiliation
Phil Martien, Toch Mangat, Amir Fanai Bay Area AQMD

Bob Nunes Monterey Bay Unified APCD Charles Anderson, Bruce Katayama, Greg Tholen, Brig ette Tollstrup Sacramento Metro AQMD

Donald Hunsaker, Stephen Shaw, Evan Shipp, Michelle Stanley San Joaquin Valley Unified APCD

Leonard Seitz Caltrans Headquarters

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Vernon Hughes, Ravi Ramilingam, Klaus Scott, Tess S icat, Cheryl Taylor, Bruce Tuter, Ed Yotter ARB



### 1. Welcome and Feedback on September 3 Meeting

ARB welcomed everyone to the call. Additional clar ification was added to the second paragraph under “Other Issues” of the September 3 m inutes. Earth Matters clarified that the updates to VMT were in response to an 8/15 /03 letter from ARB requesting review. A letter had been sent to ARB providing co mments on the VMT for the SJV COGs indicating that four VMT totals needed adjustm ent.

2. Update on Status of Gridded Inventory The group reviewed the latest tracking sheet prepar ed by ARB that shows the status of the CCOS modeling inventories. Alpine Geophysics m entioned that they have removed all but the most current versions of the modeling f iles on the ftp site; all the previous files will be sent to ARB on tape and are available if an yone needs them. No other files were

removed.

Alpine reported on the status of the gridded invent ories:

July 1999 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year. Biogenics modelin g files for the base year are also used for all future years (this applies to all epis odes). Point and area modeling files

are available. On-road motor vehicle files are ava ilable for the base year, 2005 and 2007. On-road motor vehicle modeling files for 200 6 and 2010 will be available in the next couple of days.

July/August 2000 episode – Point source modeling files are completed for th e base year (2000) and future years (2005, 2006, and 2010) . The base year (2000) area source modeling files have been updated to include day-specific shipping emissions provided by the BAAQMD; the revised files will be p osted soon. Area source modeling files for future years remain unchanged si nce mid-August. Biogenic modeling files have been revised to correct the err or found in the isoprene emissions (see below, section 4. Biogenic Emissions). On-roa d motor vehicle files are available for all years. Revised summary reports f or point and area sources (by county and EIC) that reflect the latest inventories will be posted shortly.

### ___________________________________________________ ___________________ A-27 September 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (200 0) and future years (2005, 2006, and 2010). Biogenic NO emissions have not been inc luded in the biogenic modeling files for this episode.

August 2002 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2002) and fu ture years (2005, 2007, 2008, 2010, 2012 and 2018).

July 1990 episode – Sacramento Metro AQMD mentioned that some modeli ng files are available for this episode. They requested tha t the tracking sheet be updated to reflect this information and report the vintage of the data.

3. Discussion on Wildfire Emissions

The group discussed the treatment of wildfire emiss ions in future year inventories. Options discussed by the group included:

1) Leave the wildfires out of future year modeling (done in past modeling work) 2) Include the base year wildfires in the future ye ar modeling (same as the base year) 3) Include an average value of emissions based on s ome number of past years (e.g. 20 years, 40 years); possibly use map fire re turn intervals to determine the most likely place for fires to occur 4) Use a similar method for wildfires to what is be ing considered by the WRAP for the treatment of prescribed fires (Environ is repor tedly looking into this) 5) Swap out day-specific wildfire emissions for dif ferent episodes to determine the effect of fires (e.g. swap fires in August 2000 wit h fires in August 2002) 6) Treat in initial conditions/boundary conditions

Participants on the call were encouraged to send to ARB their conceptual solutions or approaches on how to handle wildfire emissions in f uture year modeling. ARB will summarize the information gathered and provide it t o the group for discussion at a

future conference call.

4. Biogenic Emissions

Bay Area staff had previously asked about the VOC e missions on August 1 of the July/August 2000 episode since the hourly distribut ion appeared different than the other days of the episode. In particular, the emissions are fairly high at night and there was a dip in the emissions about 1 p.m. across the entire domain. Upon review by Alpine Geophysics and ARB, it was discovered that an error had occurred in the processing of the isoprene emissions for August 1. The problem o nly affected isoprene and only that day was affected. Alpine has corrected the problem and posted revised modeling files on the ftp site. ARB has rerun the air quality mod el with the revised file and noticed about a 1 ppb difference on August 1.

### ___________________________________________________ ___________________ A-28 As mentioned previously, Alpine Geophysics has esti mated biogenic NO emissions. These emissions were added to the biogenic emission s estimated by ARB using BEIGIS for the July 1999, August 2002, and July/Aug ust 2000 episodes. Biogenic NO emissions have not been added to the September 2000 episode. The tracking sheet for SIP modeling inventories has been updated to reflec t whether biogenic NO has been added or not to the modeling inventories.

Alpine used a soil NO algorithm found in BEIS-3 to estimate biogenic NO for modeling purposes. This estimate is about double a previous estimate from UC Berkeley, which is still within the uncertainty of the estimation t echnique. ARB is looking into potential

data sources or methods that could be used to valid ate the emission estimates such as using California-specific data. This latest biogen ic NO estimate is about 2-3% of the

total NOx emissions in the domain. ARB is also mod eling with and without biogenic NO to determine its impact on ozone concentrations. O nce the sensitivity to biogenic NO emissions has been determined, ARB will consider wh ether to modify the new biogenic NO estimates or leave them as estimated by Alpine G eophysics.

5. Other Issues

Alpine Geophysics mentioned that the final Integrat ed Transportation Network (ITN) report has not been completed.

Previously, ARB distributed a draft report by Dr. R ob Harley (UCB) that applies a fuelbased emissions inventory method to estimate CO, NO x, and NMOC on-road motor vehicle emissions in the Sacramento Valley, San Joa quin Valley, and the Bay Area. The fuel-based method is compared to EMFAC totals f or the same areas. ARB will compile any comments that members of the group woul d like to provide.

Dr. Harley’s report suggests that NOx emissions fro m diesel engines could be underestimated in the San Joaquin Valley. Staff fr om the SJVUAPCD added that emissions from seasonal heavy-duty diesel trucks mi ght not be fully captured in the current on-road motor vehicle inventory. Many of t hese trucks only operate two months of the year and only travel on local or collector r oads. However, little information is

available on which to base emission estimates.

ARB staff mentioned that they are looking at a rece nt heavy-duty truck survey completed by Caltrans. ARB staff is comparing VMT estimates from EMFAC with those from the survey. Preliminary findings are that the statewide VMT in EMFAC are in fairly good agreement with the survey, but that the distri bution of VMT by region is different. ARB staff is continuing to investigate. The repres entative from Earth Matters mentioned that the SJV COGs are working on a truck model that will include commodity flow. The COGs hope to have a working version of the model in the next few months; the status of the model will be given at the next conference call . The topic of heavy-duty truck emissions will be added to the agenda.

### ___________________________________________________ ___________________ A-29 BAAQMD staff has been comparing temperature fields used in the models with surface temperature observations for the July/August 2000 e pisode. BAAQMD staff observed that the temperatures developed through objective a nalysis by ARB look low compared to observations at some locations in the Bay Area ( i.e. there seem to be “cold holes” upwind of Livermore). BAAQMD staff agreed to send the information to ARB for review.

6. Plans for Next Meeting

The next conference call is scheduled for Tuesday, September 30.



## September 30, 2003

Attendees Affiliation
Charles Anderson, Bruce Katayama, Brigette Tollstru p Sacramento Metro AQMD David Nunes, Stephen Shaw, Michelle Stanley San Joa quin Valley Unified APCD

Frank Law Caltrans Sally Rodeman Caltrans District 10

Jason Paukovits Fresno COG

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Chris Emery Environ Mark Carlock, Vernon Hughes, Klaus Scott, Tess Sica t, Cheryl Taylor, Ed Yotter ARB



### 1. Welcome and Feedback on September 17 Meeting

ARB welcomed everyone to the call. Introductions w ere made. The September 17 minutes were approved as written.

2. Status of Wildfire and Biogenic Emissions

ARB gave a status report on wildfire and biogenic e missions. On previous calls, the group discussed the treatment of wildfire emissions in future year inventories. Several options have been discussed. Participants were enc ouraged to send to ARB their conceptual solutions or approaches to ARB. ARB has received two comments to date; comments are still requested. ARB will summarize t he information gathered and provide it to the group for discussion at a future conference call.

As mentioned previously, the biogenic modeling file for August 1, 2000 has been corrected and posted on Alpine’s ftp site. An erro r occurred during processing of the isoprene emissions that caused the hourly isoprene emissions to be distributed incorrectly over that day. ARB has rerun the air q uality model with the revised file and noticed about a 1 ppb change in ozone concentration on August 1.

As mentioned previously, Alpine Geophysics has esti mated biogenic NO emissions. These emissions were added to the biogenic emission s estimated by ARB using BEIGIS for the July 1999, August 2002, and July/Aug ust 2000 episodes; they were not added to the September 2000 episode.

### ___________________________________________________ ___________________ A-30 The biogenic NO emissions estimated by Alpine were about double a previous estimate. ARB modeled with and without biogenic NO to determi ne its impact on ozone concentrations. ARB reported that they saw negligi ble impact on ozone concentrations. ARB will not pursue refinements to the biogenic NO estimates for the SIP modeling for the 1-hour ozone standard. The group agreed to add biogenic NO emissions to the September 2000 episode for consistency with the oth er episodes.

3. Discussion of Heavy-duty Truck Emissions

Earth Matters mentioned that an update on the truck model being developed by the San Joaquin Valley COGs was distributed to the group al ong with a draft report that is available for review. The truck model is jointly m anaged by Caltrans and the Fresno COG. A final report is scheduled for release in Oc tober. A steering committee has been organized to determine how the truck model wil l be used. Comments on the draft report can be provided to the Fresno COG. ARB aske d if the truck model had been compared to EMFAC; Earth Matters will find out if a comparison is planned. ARB also asked to be included for receiving more details on the truck model.

Previously, ARB distributed a draft report conducte d under CCOS by Dr. Rob Harley (UCB) that applies a fuel-based emissions inventory method to estimate CO, NOx, and

NMOC on-road motor vehicle emissions in the Sacrame nto Valley, San Joaquin Valley, and the Bay Area. Earth Matters provided comments, which will be included in ARB’s comments on the report. At this point, the project stands as an independent, CCOSbased study of on-road motor vehicle emissions and will not directly result in changes to

EMFAC.

ARB staff mentioned that they are looking at a rece nt Caltrans survey of 8200 heavyduty trucks. SJVUAPCD staff asked if the survey ca ptured seasonal trucks since they do not normally travel on freeways. ARB responded that they are probably not captured in the survey because they were conducted at truck stops. ARB pointed out that the heavy-duty emissions from EMFAC are based on DMV re gistration. As long as they are registered, the emissions from seasonal trucks are included in EMFAC. SJVUAPCD staff said that the seasonal trucks are registered with DMV. Although the emissions are included in EMFAC, the seasonal variation of the em issions is not well represented. The activity of these trucks is spread over the ent ire year. The on-road motor vehicle emissions used in modeling for the SIPS may be unde restimated. ARB staff has been directed by its upper management to investigate the seasonality of on-road motor

vehicle emissions. ARB staff is to determine wheth er there is a problem for the SIPs and, if so, what is its magnitude. If a problem is determined, ARB will make adjustments. ARB staff has been directed to review San Joaquin Valley first; changes

to other areas will be considered after SJV. SJVUA PCD staff commented that modeling results are needed by the first of November. Sac M etro staff expressed similar concerns to San Joaquin about the seasonality of em issions; modeling results are needed by January 1 for Sacramento.

### ___________________________________________________ ___________________ A-31 4. Update on Status of Gridded Inventory

Alpine reported on the status of the gridded invent ories. The version control log (for the July/August 2000 episode) is being updated. Revise d emission summaries and speciated summaries will be posted soon.

July 1999 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year. Biogenics modelin g files for the base year are also used for all future years (this applies to all epis odes). Point, area, and on-road motor vehicle modeling files are available for 2005 , 2006, 2007, and 2010. Point source files have been revised and posted for the b ase year and all future years. It was discovered that some large facilities were miss ing UTM coordinates; the default is for the facility to be placed at the center of t he county. These large facilities were assigned coordinates and the files reprocessed. Th e updated files have version

V092703 in the file name.

July/August 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (200 0) and future years (2005, 2006, and 2010). As described for the July 1999 episode above, base year and future year point source files have been revised and poste d. The day-specific file for wildfires in the base year is being revised to vert ically distribute the emissions of the smaller wildfires. Previously, only the two large fires (Manter and Plaskett) had

vertical distributions.

September 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (200 0) and future years (2005, 2006, and 2010). Biogenic NO emissions have not previous ly been included in the biogenic modeling files for this episode; Alpine Ge ophysics will add biogenic NO. As described for the July 1999 episode above, base yea r and future year point source files have been revised and posted. The day-specif ic file for wildfires in the base year is being revised to vertically distribute the emissions of the smaller wildfires.

August 2002 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (2002) and fu ture years (2005, 2007, 2008, 2010, 2012, and 2018). As described for the July 1 999 episode above, base year and future year point source files have been revise d and posted. The day-specific file for wildfires in the base year is being revise d to vertically distribute the emissions of the smaller wildfires. Previously, only the McN ally fire had vertical distribution.

August 1990 episode – Sacramento Metro AQMD mentioned that some modeli ng files are available for this episode. They request ed that the tracking sheet be updated to reflect this information and report the vintage of the data.

### ___________________________________________________ ___________________ A-32 5. Status of Integrated Transportation Network (ITN ) Report

Alpine Geophysics reported that they are continuing to work on the final ITN report. ARB reported that the CCOS Technical Committee woul d like to see the report prior to modeling results. ARB asked Alpine to complete the final report in the next two weeks.

6. Other Issues

On previous calls, BAAQMD staff mentioned that they have been comparing temperature fields used in the models with surface temperature observations for the July/August 2000 episode. BAAQMD staff observed th at the temperatures developed through objective analysis by ARB look low compared to observations at some locations in the Bay Area (i.e. there seem to be “cold holes” upwind of Livermore). BAAQMD staff is comparing RAMS, MM5, and ARB’s objective analysi s against observations. At the request of the BAAQMD, Alpine Geophysics has create d new biogenic emissions (using BEIGIS) and new on-road motor vehicle emissions usi ng RAMS temperatures. Biogenic emissions generally increased about 5% ove rall in the Bay Area, although there was a small drop in isoprene in the first thr ee days of the episode due to

cloudiness. The rest of the domain showed about a 10% increase in isoprene

emissions. For the new on-road motor vehicle emiss ions, there was a general increase in emissions with three exceptions: 1) In the Sacra mento area, the overall TOG emissions were about the same. 2) Also in the Sacr amento area, the TOG emissions increased in the first three days and decreased in the last three days. 3) In the Bay Area, the NOx emissions stayed about the same overa ll, but TOG increased about 5%. Alpine agreed to send ARB the RAMS data. BAAQMD st aff is generating graphics that

can be shared.

7. Plans for Next Meeting

The next conference call is scheduled for Wednesday , October 15.



## October 15, 2003

Attendees Affiliation

Phil Martien, Amir Fanai Bay Area AQMD Bruce Katayama, Greg Tholen, Brigette Tollstrup Sac ramento Metro AQMD Donald Hunsaker, Tom Jordan, David Nunes, Stephen Shaw, Michelle Stanley San Joaquin Valley Unified APCD

Dick Fahey Caltrans District 4 Sally Rodeman Caltrans District 10 Frank Law, Wayne Luney, Leonard Seitz Caltrans Head quarters

Cari Anderson Earth Matters

Jim Wilkinson Alpine Geophysics Klaus Scott, Tess Sicat, Cheryl Taylor ARB

### ___________________________________________________ ___________________ A-33 1. Welcome and Feedback on September 30 Meeting

ARB welcomed everyone to the call. Introductions w ere made. The September 30 minutes were approved as written.

2. Freezing Inventory for SIP Planning

ARB mentioned that the future year attainment-level inventories for the July/August 2000 episode need to be frozen. The base case mode l performance and future base

case are frozen. This item will be discussed furth er at the October 20 all-district modeling call.

3. Discussion of Heavy-duty Truck Emissions

At previous meetings, the truck model being develop ed for the San Joaquin Valley

COGs was discussed. ARB asked if the truck model h ad been compared to EMFAC. The representative from Earth Matters said that she believes that a second document exists that discusses emissions; she will send the document to ARB for distribution

when it becomes available.

Previously, ARB staff mentioned that they are looki ng at a recent Caltrans survey of 8200 heavy-duty trucks. Caltrans staff provided ad ditional information about the survey. ARB staff is investigating the use of the Caltrans survey information to possibly redistribute heavy-duty truck activity. Currently in EMFAC, emissions from heavy-duty trucks are based on DMV registration.

During earlier calls, members of the group have exp ressed concern that seasonal truck activity is not captured well in EMFAC. Although t he emissions from seasonal trucks are included in EMFAC since they are registered wit h DMV, the seasonal variation of the emissions is not well represented. ARB staff i s investigating the seasonality of onroad motor vehicle emissions. Sacramento Metro AQM D staff reported at an earlier call that SACOG had studied the seasonal activity of tru cks in the Sacramento area. ARB has requested information from SACOG and is waiting for a response. In addition to the seasonal, temporal variation, the spatial variation would also need to be addressed.

4. Update on Status of Gridded Inventory

ARB reported that few changes have been made since the last call. Following is the status of the inventories for each episode.

July 1999 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year. Biogenics modelin g files for the base year are also used for all future years (this applies to all epis odes). Point, area, and on-road motor vehicle modeling files are available for 2005 , 2006, 2007, and 2010. An error

has been found in the weekend on-road motor vehicle emissions. Revised modeling files will be posted soon. The weekday on-road mot or vehicle emissions were

unaffected.

### ___________________________________________________ ___________________ A-34 July/August 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (200 0) and future base case years (2005, 2006, and 2010).

September 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (200 0) and future base case years (2005, 2006, and 2010). Biogenic NO emissions have not previously been included in the biogenic modeling files for this episode; Al pine Geophysics will add biogenic

NO.

August 2002 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (2002) and fu ture base case years (2005, 2007, 2008, 2010, 2012, and 2018). An error has be en found in the weekend onroad motor vehicle emissions. Revised modeling fil es for the weekend only have been posted. The weekday on-road motor vehicle emi ssions remain unchanged.

August 1990 episode – Sacramento Metro AQMD mentioned that some modeli ng files are available for this episode. They request ed that the tracking sheet be updated to reflect this information and report the vintage of the data.

5. Status of Integrated Transportation Network (ITN ) Report

Alpine Geophysics reported that they plan to post t he latest revision to the ITN report by October 17. ARB will send a note to the group when the report is available for review.

6. Other Issues

BAAQMD staff has been comparing temperature fields used in the models with surface temperature observations for the July/August 2000 e pisode. BAAQMD staff observed that the temperatures developed through objective a nalysis by ARB look low compared
to observations at some locations. BAAQMD staff ha s prepared a revised temperature field that will be ready today. BAAQMD staff has d irected Alpine to create revised biogenic and on-road motor vehicle emissions estima tes to determine the change from previous emission estimates. BAAQMD will notify AR B when the revised temperature field is available on Alpine’s ftp site. ARB will review the information.

BAAQMD staff said that they have been comparing the emissions summary reports from the ftp site with summer planning emission est imates for the Bay Area for the July/August 2000 episode. They expressed concern a bout the CO and TOG emissions for the individual days compared to the emissions e stimated by ARB available on the web. BAAQMD staff agreed to send ARB and Alpine Ge ophysics the comparison information for investigation.

The group asked that the status of wildfires be add ed to the agenda for the next call.

### ___________________________________________________ ___________________ A-35 7. Plans for Next Meeting

The next conference call is scheduled for Wednesday , October 29.



## October 29, 2003

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien Bay Area AQMD Charles Anderson, Bruce Katayama, Brigette Tollstru p Sacramento Metro AQMD Donald Hunsaker, David Nunes, Evan Shipp, Michelle Stanley San Joaquin Valley Unified APCD

Harold Brazil MTC Wayne Luney, Leonard Seitz Caltrans Headquarters

Cari Anderson Earth Matters Cyndi Loomis Alpine Geophysics Vernon Hughes, Doug Ito, Anne Lin, Ravi Ramalingam, Tess Sicat, Cheryl Taylor, Bruce Tuter, Ed Yotter ARB



### 1. Welcome and Feedback on October 15 Meeting

ARB welcomed everyone to the call. Introductions w ere made. San Joaquin staff asked about the accuracy of the write-up related to “Discussion of Heavy-duty Truck Emissions.” After discussion and clarification, th e minutes were accepted as written.

2. Freezing Inventory for SIP Planning

ARB described the overall process for SIP modeling. There are three phases. The first phase is base-case modeling. Meteorology and emiss ions are developed to simulate as closely as possible the conditions during each d ay of the episode being modeled. Model performance must meet EPA’s criteria for mode l performance. ARB has achieved adequate model performance for the July/Au gust 2000 episode. Once adequate base-case model performance is achieved, t he model is run using future year emissions that reflect growth in emission categorie s as well as the effect of adopted control measures. This second phase is base-case f uture year modeling. Carrying capacity diagrams are developed to aid planners in developing reduction strategies to reach the air quality standard. ARB has completed carrying capacity diagrams for the July/August 2000 CCOS episode and made this informa tion available to the air districts. The third phase is attainment strategy modeling. T he model is run using inventories that reflect proposed control measures needed to at tain the standard.

ARB is now preparing for attainment modeling (third phase) for the July/August 2000 CCOS episode. At the end of August and early Septe mber 2003, ARB sent letters to the districts and COGs requesting any changes to em issions or vehicle activity that would be included in attainment strategy modeling r uns. ARB did receive some changes that will be updated. ARB was asked if the first and second phases will be rerun due to changes in the inventory. ARB said no , since adequate model performance has been reached. ARB now considers th e inventories for the base-case modeling and base-case future year modeling frozen.

### ___________________________________________________ ___________________ A-36 Based upon BAAQMD/ENVIRON modeling, BAAQMD staff ha ve expressed some concerns about the base year and future year invent ories at previous meetings of this group and at Bay Area Modeling Advisory Committee m eetings. BAAQMD staff wants to resolve their inventory concerns before they mov e on to attainment strategy runs. However, BAAQMD staff acknowledged that time is sho rt for SJVUAPCD staff to meet

SIP deadlines.

ARB asked each district when they would need the re sults of draft and final attainment modeling runs. Sacramento Metro staff said that th ey would need draft runs in late January 2004. They will be holding a workshop to d iscuss proposed control strategies in March and would need final attainment modeling r uns completed in May. San Joaquin Valley staff said that they plan to have a workshop in mid-December and would

like to have the results of draft attainment runs t o share at the workshop. Bay Area staff replied that the schedule for the Bay Area is uncer tain; they will get back to ARB.

ARB is developing a spreadsheet for receiving contr ol strategy information from the

districts. ARB asked who from each district would be the best contact for requesting this information. Brigette Tollstrup will be the c ontact for Sacramento, Stephen Shaw will be the contract for San Joaquin, and Jean Rogg enkamp will be the contact for Bay

Area.

3. Mobile Source Issues

ARB presented information to the group related to E MFAC and conformity. EMFAC is the official EPA-approved mobile source emission fa ctor model in California. EMFAC is

used to estimate on-road mobile source emissions fo r use in SIP development and transportation conformity determinations. ARB fini shed a comprehensive update of EMFAC last year (EMFAC2002). While EMFAC will be u pdated in the future, ARB does not have a schedule for an update at this time. Tr avel activity data from travel model output provided by local transportation planning ag encies were included as part of the EMFAC update, and continue for conformity purposes per federal conformity regulation requirements. As a result of the EMFAC model updat e, many SIPs in California also had to be updated. Any additional model changes to EMFAC would require model approval by EPA for use in the SIPs and conformity, and could effectively require SIP updates.

As discussed at previous meetings, ARB is studying a Caltrans survey of heavy-duty trucks, and will work closely with the districts an d COGs prior to an EMFAC model update that would incorporate any changes. The Cal trans survey indicates a different geographic distribution of heavy-duty truck travel than what is currently in EMFAC2002.

Members of the group continue to express concern th at seasonal truck activity is not captured well in EMFAC, causing summertime emission s to be underestimated. ARB staff is investigating the seasonality of on-road m otor vehicle emissions, but work is not yet completed. Updated activity normally comes fro m local travel demand models. ARB staffs believe that the incorporation of season al trends would constitute an EMFAC

### ___________________________________________________ ___________________ A-37 model change. It was suggested that districts who are concerned about this issue should elevate their concerns to their planning man agers to initiate policy discussions with ARB’s management.

4. Status of Wildfires

Since the occurrence and extent of wildfires is unp redictable, ARB will exclude wildfire emissions from future year modeling runs. Wildfire s have been excluded from the future year base-case runs used to develop carrying capacities. This group has discussed various options on how to treat wildfires in future year modeling runs (both base-case and attainment). Although ARB staff beli eves that wildfires are likely to occur in future years, no one knows when or where they wi ll occur. The Smoke Management

Plan is intended to reduce the likelihood of wildfi res by allowing prescribed burning.

San Joaquin Valley staff expressed the opinion that this subject needs more discussion and that this issue is still not decided. They wou ld like to consider putting some average wildfire emissions in the future years. Th ey also asked if sensitivity runs could be made with and without fires. ARB staff suggeste d that districts’ staffs who are

concerned about this issue should raise the issue f or discussion with upper management at their districts and ARB.

5. Temperature Fields for July/August 2000 Episode

As mentioned previously, BAAQMD staff observed that the temperatures developed through objective analysis by ARB looked low compar ed to observations at some locations for the July/August 2000 episode. As a r esult, BAAQMD staff prepared an alternative temperature field and directed Alpine G eophysics to create revised biogenic

and on-road motor vehicle emissions estimates. BAA QMD staff reported that there are differences in the biogenic and on-road motor vehic le modeling inventories, but the impact was not as great as they expected to find. BAAQMD’s temperature field is now available on Alpine’s ftp site. ARB will review th e information. If the ARB agreed to use the BAAQMD’s temperature field, it would used for a ttainment runs. Base-case modeling will not be revisited. ARB will give a st atus report to the group at the next call on the results of its review of the BAAQMD’s temper ature field and its possible use in

attainment runs.

6. Update on Status of Gridded Inventory

ARB reported that one change had been made since th e last call. Following is the status of the inventories for each episode.

July 1999 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year. Biogenics modelin g files for the base year are also used for all future years (this applies to all epis odes). Point, area, and on-road motor vehicle modeling files are available for 2005 , 2006, 2007, and 2010. Previously, an error was found in the weekend on-ro ad motor vehicle emissions.

### ___________________________________________________ ___________________ A-38 Revised modeling files have been posted. The weekd ay on-road motor vehicle

emissions were unaffected.

July/August 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (200 0) and future base-case years (2005, 2006, and 2010).

September 2000 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (200 0) and future base-case years (2005, 2006, and 2010). Biogenic NO emissions have not previously been included in the biogenic modeling files for this episode; Al pine Geophysics will add biogenic

NO.

August 2002 episode – Point, area, biogenic, and on-road motor vehicle modeling files are completed for the base year (2002) and fu ture base-case years (2005, 2007, 2008, 2010, 2012, and 2018).

August 1990 episode – Sacramento Metro AQMD mentioned that some modeli ng files are available for this episode. They request ed that the tracking sheet be updated to reflect this information and report the vintage of the data.

7. Status of Integrated Transportation Network (ITN ) Report

Alpine Geophysics reported that they plan to post t he latest revision to the ITN report by November 7. ARB will send a note to the group when the report is available for review.

8. Other Issues

During the last call, BAAQMD staff said that they h ad been comparing the emissions summary reports from the ftp site with summer plann ing emission estimates for the Bay Area for the July/August 2000 episode. They expres sed concern about the CO and TOG emissions for the individual days compared to t he emissions estimated by ARB
and available on the web. BAAQMD staff sent ARB an d Alpine Geophysics the comparison information for investigation. ARB staf f responded that they had looked at the emissions comparisons. ARB staff would send th e BAAQMD staff the information they had gathered along with an explanation that is hoped to alleviate the BAAQMD’s

concerns.

BAAQMD staff expressed concern about the volumes of heavy-duty trucks on weekdays versus weekend days. ARB said (this state ment was later discovered to be incorrect; please see Important Note below) that th e only differences between weekday and weekend emissions are due to day-specific tempe ratures and relative humidity along with the spatial and temporal variations deve loped by Dr. Deb Niemeier.

Otherwise the emissions from EMFAC are the same for weekdays and weekends. The BAAQMD has received information from MTC showing re duced volumes of trucks on the weekends. Several members of the group express ed concern about the volumes of cars and trucks not being adjusted on weekend days. [IMPORTANT NOTE: Since this

### ___________________________________________________ ___________________ A-39 meeting, ARB staff discovered that they were incorr ect about the statements made in the previous paragraph concerning weekday and weeke nd on-road motor vehicle estimates used in modeling. The following paragrap h describes how the motor vehicle emissions from EMFAC are adjusted for a weekend day in the modeling inventories. ARB staff paraphrased this information from a note by Jim Wilkinson, Alpine Geophysics, who developed the ITN and developed the on-road motor vehicle modeling files for many of the episodes.

The on-road motor vehicle emissions are calculated using EMFAC, based on the VMT in EMFAC. However, the weekend VMT to weekday VMT ratio from the ITN is used to

scale the EMFAC emissions to a "weekend" estimate. The ITN is comprised of the travel networks that were provided to Alpine Geophy sics by CCOS domain transportation agencies. Again to reiterate, EMFAC estimates average weekday

emissions based on VMT that resides in EMFAC. To b e more specific, the weekend day on-road mobile source CO, TOG, and NOx emission s are less than the weekday emissions by roughly 12% (i.e., the weekend days ar e equal to about 88% of the weekday on-road mobile source emissions). The exce ption is for heavy-duty diesel vehicle NOx emissions. Heavy-duty diesel NOx emiss ions are lower by about 46% on the weekend days. ARB developed the scaling factor s (i.e., 0.88 for TOG, NOx, and CO with the exception for HDDV NOx being 0.54) base d on the ratio of weekend VMT to weekday VMT. ]

9. Plans for Next Meeting

The next conference call is scheduled for Thursday, November 13.



## November 13, 2003

Attendees Affiliation
Amir, Fanai, Toch Mangat, Phil Martien Bay Area AQM D Bruce Katayama, Greg Tholen, Brigette Tollstrup Sac ramento Metro AQMD Donald Hunsaker, David Nunes, Evan Shipp, San Joaq uin Valley Unified APCD

Harold Brazil MTC Wayne Luney, Sally Rodeman Caltrans

Cari Anderson Earth Matters Cyndi Loomis, Jim Wilkinson Alpine Geophysics Chris Emery Environ
Paul Allen, Daniel Chau, John DaMassa, Kemal Gurer, Vernon Hughes, Doug Ito, Bruce Jackson, Ajith Kaduw ela, Klaus Scott, Tess Sicat, Neva Sotolongo, Cheryl Tay lor, Bruce Tuter, Eugene Yang, Ed Yotter ARB



### 1. Welcome and Feedback on October 15 Meeting ARB welcomed everyone to the call. Introductions we re made. The minutes were accepted as written.

### ___________________________________________________ ___________________ A-40 2. Correction: Weekend Mobile Source Emissions At the October 29 meeting, ARB incorrectly stated t hat the only differences between weekday and weekend emissions are due to day-specif ic temperatures and relative humidity, along with the spatial and temporal varia tions developed by Dr. Deb Niemeier. ARB described the correct method for calculating on -road motor vehicle emissions on weekend days for the CCOS episodes, as follows. Th e on-road motor vehicle emissions are calculated using EMFAC based on the V MT in EMFAC. However, the weekend VMT to weekday VMT ratio from the ITN is us ed to scale the EMFAC emissions to a "weekend" estimate on a county-by-co unty basis. The ITN is comprised of the travel networks that were provided to Alpine Geophysics by CCOS domain transportation agencies. Specifically, the weekend day on-road mobile source CO, TOG, and NOx emissions are less than the weekday em issions by roughly 12% (i.e., the weekend days are equal to about 88% of the week day on-road mobile source emissions). The exception is for heavy-duty diesel vehicle NOx emissions. Heavy-duty diesel NOx emissions are lower by about 46% on the weekend days.

In order to avoid confusion in the future, the BAAQ MD staff suggested that ARB provide documentation on exactly how the on-road mobile sou rce emissions were adjusted for weekdays and weekend days. ARB is already working on documentation for how the modeling inventories were created, including point, area, biogenic and on-road mobile sources. ARB will distribute the documentation by early December.

3. Policy Issues: Conformity/Wildfires At the last meeting, ARB stated that modeling staff has been directed to exclude wildfire emissions from future year modeling runs given thei r unpredictable nature. Several districts’ staff said they felt that this subject n eeded more discussion. They would like to consider putting some average wildfire emissions in the future years. They also asked if sensitivity runs could be made with and without fir es. ARB staff suggested that districts’

staffs who were concerned about this issue should r aise the issue for discussion with upper management at their districts and ARB.

At today’s meeting, Sacramento Metro and San Joaqui n Valley staff said that they had raised the issue with their management, but that a final decision on how to handle future year wildfire emissions had not been made. Staffs from all three districts again suggested including some average wildfire emissions in the future years. They also suggested doing modeling runs with and without fire s. ARB staff reiterated that districts’

staffs who are concerned about this issue should ra ise the issue for discussion with upper management at their districts and ARB.

The group did not discuss any policy issues related to conformity.

4. BAAQMD Mobile and Biogenic Issues

As mentioned previously, BAAQMD staff observed that the temperatures developed through objective analysis by ARB looked low compar ed to observations at some locations for the July/August 2000 episode. As a r esult, BAAQMD staff prepared an alternative temperature field and directed Alpine G eophysics to create revised biogenic

and on-road motor vehicle emissions estimates. BAA QMD staff reported that there are

### ___________________________________________________ ___________________ A-41 differences in the biogenic and on-road motor vehic le modeling inventories, but the impact was not as great as they expected to find. BAAQMD staff also reported that they have run their emissions through CAMx and found tha t the changes in ozone were not large. BAAQMD’s temperature field and modeling res ults are now available on Alpine’s ftp site.

At the last meeting, ARB agreed to review the tempe rature fields. ARB also ran the BAAQMD’s emissions through CAMx. Similar to the BA AQMD, ARB found no major changes in predicted ozone, with slight improvement s and degradations at various

locations around the domain.

The BAAQMD temperature field is a hybrid of observa tions and RAMS with FDDA. Environ expressed the opinion that the temperatures from RAMS are more representative than the temperatures from MM5. In particular, the temperatures over the Sierras are warmer than the temperatures develo ped by ARB. BAAQMD staff said that they have more confidence in their temperature fields. No final decision was made on which temperature field will be used for the att ainment runs.

BAAQMD staff said that they are trying to understan d why ozone is underpredicted in their modeling simulations. Changes to the tempera ture fields do not explain the low ozone values. The BAAQMD does not plan to make mor e adjustments to temperatures.

BAAQMD staff has documented the method for developi ng their surface temperature field, which they previously shared with ARB. They agreed to expand their

documentation to include the effect on emissions an d their CAMx results. BAAQMD staff agreed to send their documentation to the ARB

.

5. Attainment Modeling ARB asked each district when they would need the re sults of draft and final attainment modeling runs. San Joaquin Valley staff said that t hey plan to have a workshop in early January and would like to have modeling results to share at the workshop. Preliminary modeling results would be needed by mid-December fo r 2000, 2005 and 2010. SJV staff plan to have their third workshop in March 20 04 where they will show more modeling results and attainment demonstration. SJV UAPCD will receive and file in April with final adoption in May 2004. The San Joaquin V alley district board is expected to voluntarily reclassify from severe to extreme in De cember 2003. This action will change

the date needed for attainment to from 2005 to 2010 . SJV staffs are working on providing control strategy information to ARB for a ttainment modeling runs.

Sacramento Metro staff said that they will have no new proposed control measures available until January or February. They need to define a control strategy before control factors can be determined. Bay Area staff said that the schedule for the Bay

Area is uncertain.

ARB said they would need about two weeks for modeli ng results after receiving revised inventories. ARB plans to develop new modeling fil es that reflect recent point and area source updates made by the districts and ARB. The modeling files will include the

### ___________________________________________________ ___________________ A-42 benefits from proposed state and federal measures a s well as reflect the effects of proposed control measures for the districts.

1. Update on Status of Gridded Inventory

Alpine Geophysics reported that no changes had been made since the last call. Due to possible problems, Alpine reposted the modeling fil es for elevated fires per ARB’s request. Following is the status of the inventorie s for each episode.

July 1999 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year. Biogenics modeling fi les for the base year are also used for all future years (this applies to all episodes) . Point, area and on-road motor vehicle modeling files are available for 2005, 2006, 2007 a nd 2010.

July/August 2000 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2000) and fu ture base-case years (2005, 2006, and 2010).

September 2000 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2000) and fu ture base-case years (2005, 2006, and 2010). Biogenic NO emissions have not previous ly been included in the biogenic modeling files for this episode; Alpine Geophysics will add biogenic NO.

August 2002 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2002) and future b ase-case years (2005, 2007, 2008, 2010, 2012 and 2018).

July 1990 episode – Point, area, biogenic and on-road motor vehicle modeling files are

available for 1990 and 2005. These inventories wer e developed in 1994. The on-road

motor vehicle estimates were revised in 2002 to ref lect EMFAC2002. The biogenic emission estimates were recreated in 2002 using BEI GIS. Biogenic NO was not

included.

2. Status of Integrated Transportation Network (ITN ) Report Alpine Geophysics reported that the ITN report is n ot yet completed. ARB will send a note to the group when the report is available for review.

8. Other Issues ARB mentioned that they plan to combine the SIP Gri dded Inventory Coordination Group and All-District Modeling calls into one meet ing.

ARB announced that Ed Yotter is retiring at the end of November. Congratulations Ed!

9. Plans for Next Meeting The next conference call is scheduled for Tuesday, December 2 at 10:00 a.m.

### ___________________________________________________ ___________________ A-43 

## December 18, 2003

Attendees Affiliation
Toch Mangat, Phil Martien, Saffet Tanrikulu Bay Are a AQMD Bruce Katayama, Greg Tholen, Brigette Tollstrup Sac ramento Metro AQMD David Nunes, Stephen Shaw, Michelle Stanley, James

Sweet San Joaquin Valley Unified APCD

Bob Nunes Monterey Bay Unified APCD Wayne Luney, Leonard Seitz Caltrans

Cari Anderson Earth Matters

Jim Wilkinson Alpine Geophysics Chris Emery Environ Daniel Chau, Vernon Hughes, Bruce Jackson, Ajith Kaduwela, Anne Lin, Cheryl Taylor, Bruce Tuter ARB



### 1. Welcome and Feedback on November 13 Meeting ARB welcomed everyone to the call. Introductions we re made. The minutes were accepted as written. Earth Matters made two sugges tions for future meetings. First, ARB should clearly specify in future minutes which episode is being discussed. Second, ARB should develop a tracking sheet for modeling wo rk similar to what has been done for emissions. It should show the status of comple ted modeling work by episode for base case, future year base case and attainment run s.

2. Attainment Modeling The group discussed the availability of control fac tors from proposed control measures to use in attainment modeling runs. ARB has receiv ed control factor information from San Joaquin Valley staff. SJV is having workshops on January 6 and 7 where they will present the modeling results of the base case and f uture year base case for the July/August 2000 episode. SJV staff would like to have modeling results for the September 2000 episode to share at their next works hop.

Sacramento Metro staff said that they will have no new proposed control measures available until January or February. They need to define a control strategy before

control factors can be determined.

Control factors are not yet available for the Bay A rea because the proposed control measures are not ready yet; control factors will be provided at a later date.

ARB mentioned that they have provided future year e mission targets for the July/August 2000 episode to both San Joaquin Valley and Sacrame nto district staff. Discussions will continue into January. In the package sent to each district, ARB provided documentation on development of the meteorology and the modeling emission

inventories.

3. Documentation of Modeling Emission Inventory ARB recently distributed to the group a draft docum ent that describes how the modeling emission inventories were developed. ARB walked th e group through the basic organization of the document. The document and its appendices are available on Alpine Geophysics’ ftp site under CCAQS_Emissions/Emission Inventory Documentation. The document is still being expanded by ARB, including the addition of graphics and

### ___________________________________________________ ___________________ A-44 summaries of the emissions by domain and by region. The group is encouraged to provide comments in writing to Cheryl Taylor of ARB ( 

### cataylor@arb.ca.gov ).

Caltrans staff suggested putting more emphasis on t he use of DTIM in the development of the ITN, particularly in light of recent work by Dr. Debbie Niemeier of UC Davis. Dr. Niemeier is publishing a paper in the January 3 Atm ospheric Environment titled “UCDrive: a new gridded mobile source emission inve ntory model.” The group

discussed some of the differences between DTIM and EMFAC. Caltrans staff were asked to provide specific written comments to ARB.

4. Status of Revised Integrated Transportation Network (ITN) Report Alpine Geophysics reported that the draft final ITN report would be available by the end of the week. ARB will distribute the report to the group after a short review.

5. Policy Issues: Wildfires At previous meetings, ARB stated that modeling staf f has been directed to exclude wildfire emissions from future year modeling runs. Several districts’ staff said they felt that this subject needed more discussion. They wou ld like to consider putting some average wildfire emissions in the future years. Th ey also asked if sensitivity runs could be made with and without fires. ARB staff suggeste d that districts’ staffs who were

concerned about this issue should raise the issue f or discussion with upper management at their districts and ARB.

At today’s meeting, Sacramento Metro, San Joaquin V alley and Bay Area staff all reported that they had discussed the issue with the ir management, but that a final decision on how to handle future year wildfire emis sions had not been made.

6. Update on Status of Gridded Inventory ARB reported that one change had been made since th e last call. Alpine Geophysics has estimated biogenic NO for the September 2000 episod e. Revised biogenic files that include biogenic NO have been posted on Alpine Geophysics’ ftp site. Following is the status of the inventories for each episode.

July 1999 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year. Biogenics modeling fi les for the base year are also used for all future years (this applies to all episodes). P oint, area and on-road motor vehicle modeling files are available for 2005, 2006, 2007 a nd 2010.

July/August 2000 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2000) and future b ase-case years (2005, 2006, and 2010).

September 2000 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2000) and future b ase-case years (2005, 2006, and 2010). Biogenic NO emissions have now been included.

August 2002 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2002) and future base- case years (2005, 2007, 2008, 2010, 2012 and 2018).

### ___________________________________________________ ___________________ A-45 July 1990 episode – Point, area, biogenic and on-road motor vehicle modeling files are

available for 1990 and 2005. These inventories wer e developed in 1994. The on-road

motor vehicle estimates were revised in 2002 to ref lect EMFAC2002. The biogenic emission estimates were recreated in 2002 using BEI GIS. Biogenic NO was not included.

7. Other Issues

No other issues were discussed.

8. Plans for Next Meeting The next conference call is scheduled for Wednesday , January 14 at 10:00 a.m.



## January 14, 2004

Attendees Affiliation
Amir Fanai, Phil Martien, Saffet Tanrikulu Bay Area AQMD Charles Anderson, Bruce Katayama, Greg Tholen, Brig ette Tollstrup Sacramento Metro AQMD

David Nunes, Stephen Shaw, Evan Shipp, Michelle Stanley, James Sweet San Joaquin Valley Unified APCD

Leonard Seitz Caltrans

Cari Anderson Earth Matters

Jim Wilkinson Alpine Geophysics

Bill Stockwell DRI Chris Emery Environ Vernon Hughes, Bruce Jackson, Ajith Kaduwela, Klaus Scott, Tess Sicat, Cheryl Taylor, Eugene Yang ARB

1. Welcome and Feedback on December 18 Meeting ARB welcomed everyone to the call. Introductions we re made. The minutes were accepted

as written.

2. Status of Revised Integrated Transportation Net work (ITN) Report On December 22, ARB distributed the draft final ITN report to the group and asked for

comments. ARB received one comment from the Sacram ento Metro AQMD:

Request further explanation of the following statem ent from the ITN report pg 4-8 Step 5: "....Since heavy-duty diesel VMT is drastically red uced on weekends and their effect is largely on NOX emissions, NOX emissions were scaled by a factor of 0.536, which represents the average reduction in NOX emissions f or a South Coast Air Basin weekend day."

My concern is the chemistry (i.e. NOx inhibition) is very different here in our area (Sac Metro) compared to SoCAB, based on what DRI reporte d in their observational analysis. I suspect other areas differ also. Does it makes se nse to reduce weekend HD weekend NOX by 50+% based on a SoCAB weekend day across the board?

ARB staff responded that the factor of 0.536 was de veloped based on data recorded from traffic counts from about 20 Weigh-In-Motion (WIM) stations from the SoCAB. There are 20-

30 stations in all of Northern California. ARB is responding to this question in two ways.

### ___________________________________________________ ___________________ A-46 First, ARB will analyze what data are available for Northern California. Second, ARB is running modeling simulations to look at the effect of the weekend motor vehicle inventory on the ozone concentrations. ARB is replacing the Sat urday and Sunday on-road motor vehicle inventories in the July/August 2000 episode with the Monday on-road motor vehicle inventory from that episode to determine what diffe rence it makes. ARB will report the results to the group at the next call.

BAAQMD and SJVUAPCD staffs said that they would pro vide comments to ARB next week. Additionally, SJV staff suggested that a table be a dded to the report. The table would list the counties for which local transportation data we re not used in the ITN.

Caltrans staff complimented Alpine Geophysics on th e thoroughness of the report. Since funds are nearly expended for this project, Caltran s staff wondered who would continue to work on this project such as updating the ITN with the new Caltrans Statewide Transportation Model when it is completed. Caltran s staff reported that the 2000 base year is nearly finished, but the future years have yet t o be done. Caltrans staff suggested that perhaps Caltrans might continue this work. Caltran s staff will suggest to Caltrans management that they take on this project.

3. Documentation of Modeling Emission Inventory Previously, ARB distributed to the group a draft do cument that describes how the modeling emission inventories were developed. ARB reported that they have not received any comments. ARB is continuing to expand the document and will post a new version when substantial changes have been made. The group is en couraged to provide comments in writing to Cheryl Taylor of ARB ( cataylor@arb.ca.gov ).

The group discussed the hourly distribution of on-r oad motor vehicle emissions on weekends. Alpine Geophysics staff described how we ekend emissions are developed. During this discussion, the group determined that t he following statement in the emission inventory documentation is incorrect as stated: “E ven though we feel that the weekend inventories are approximate at the hour and county level, the lack of weekend transportation models result in the same hourly spatial distributi on for each county for both weekday and weekend days.” Distinct weekend and weekday distri butions were available from the data gathered during the CCOS field study in 2000 by Dr. Niemeier of UC Davis. ARB will correct the emission inventory documentation.

BAAQMD staff pointed out that the hourly distributi on profiles (for both weekdays and weekends) are the same for light-duty and heavy-dut y vehicles

. BAAQMD staff was asked

to send their observation in an email to ARB. This point will be noted in the emission inventory documentation and the ITN report. Additi onally, Caltrans staff offered to investigate the availability of traffic count infor mation to develop hourly distributions.

4. Attainment Modeling The group discussed the availability of control fac tors from proposed control measures to use in attainment modeling runs. ARB has received control factor information from San Joaquin Valley staff for 2005. Sacramento Metro st aff said that they will have no new proposed control measures available until February. Control factors are not yet available for the Bay Area.

### ___________________________________________________ ___________________ A-47 5. Policy Issues: Wildfires SJVUAPCD staff said that they are still undecided o n how to handle wildfire emissions in future year modeling runs. ARB staff suggested that districts’ staffs who were concerned

about this issue should raise the issue for discuss ion with upper management at their districts and ARB. The group raised the question a bout what EPA expects to see

addressed in the SIPs related to wildfires in futur e years. It may be difficult to justify them as exceptional events since they occurred somewhere in the domain in every episode being

modeled.

6. Update on Status of Gridded Inventory ARB reported that the only recent change has been t o include biogenic NO for the September 2000 episode. The group discussed the use of temper ature in the calculation of biogenic NO. Following is the status of the inventories for each episode.

July 1999 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year. Biogenics modeling fi les for the base year are also used for all future years (this applies to all episodes). Point , area and on-road motor vehicle modeling files are available for 2005, 2006, 2007 and 2010.

July/August 2000 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2000) and future base- case years (2005, 2006, and 2010).

September 2000 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2000) and future base- case years (2005, 2006, and 2010). Biogenic NO emissions have now been included.

August 2002 episode – Point, area, biogenic and on-road motor vehicle modeling files are completed for the base year (2002) and future base- case years (2005, 2007, 2008, 2010, 2012 and 2018).

July 1990 episode – Point, area, biogenic and on-road motor vehicle modeling files are available for 1990 and 2005. These inventories were develope d in 1994. The on-road motor vehicle

estimates were revised in 2002 to reflect EMFAC2002 . The biogenic emission estimates were recreated in 2002 using BEIGIS. Biogenic NO was no t included.

7. Other Issues Leonard Seitz (not representing any organization) m entioned that he had made personal

comments to EPA Docket OAR-2003-0049-0116 to allow photochemical modeling for conformity analysis. Leonard asked that his commen ts be distributed to the group.

8. Plans for Next Meeting The next conference call is scheduled for Wednesday , February 4 at 10:00 a.m.

### ___________________________________________________ ___________________ A-48 

## February 11, 2004

Attendees Affiliation
Amir Fanai, Toch, Mangat, Phil Martien, Saffet Tanr ikulu Bay Area AQMD Kristian Damkier, Tom Infusino, Aleta Kennard, Greg Tholen, Brigette Tollstrup Sacramento Metro AQMD

Donald Hunsaker, David Nunes, Stephen Shaw, Michell e Stanley San Joaquin Valley Unified APCD

Vahid Nowshiravan, Leonard Seitz Caltrans

Harold Brazil MTC

Jim Wilkinson Alpine Geophysics

Cari Anderson Earth Matters Kemal Gurer, Neva Sotolongo, Cheryl Taylor, Bruce T uter ARB

1. Welcome and Feedback on January 14 Meeting ARB welcomed everyone to the call. Introductions w ere made. The minutes were accepted as written. Staff from Earth Matters suggested tha t the agenda item “Update of Status of Gridded Inventory” simply list what has changed sin ce the last meeting.

2. Status of Revised Integrated Transportation Net work (ITN) Report During the last meeting, the group discussed a comm ent from the Sacramento Metro AQMD staff questioning the scaling factor of 0.536 appli ed to heavy-duty diesel NOx emissions to estimate a weekend day. ARB agreed to investigate this question in two ways and report the results to the group:

First, ARB noted that the factor of 0.536 was devel oped based on data recorded from traffic counts from Weigh-In-Motion (WIM) stations in South ern California. ARB agreed to analyze

what data are available for Northern California. A RB reported that they have analyzed

about 2/3 of the WIM data for 2001 for California. Of the data analyzed, the preliminary ratio of the weekend to weekday counts is around 0.3. Th ere also may be a difference between Saturday and Sunday. These data are very prelimina ry; ARB staff will continue the analysis and report back to the group.

Second, ARB staff agreed to run modeling simulation s to look at the effect of the weekend motor vehicle inventory on the ozone concentrations . ARB staff replaced the Saturday and Sunday on-road motor vehicle inventories with the M onday on-road motor vehicle inventory in the July/August 2000 episode to determine the ef fect the weekend emissions have on

ozone concentrations. ARB staff included the model ing results with the agenda for this meeting. To display the results, ARB staff develop ed an animation that showed the difference in ozone concentration by hour from Satu rday, July 29 through Wednesday, August 2, 2000. The animation displayed the differ ence in ozone concentration between two simulations: 1) on-road motor vehicle emissions on Monday substituted for Saturday and Sunday and 2) the current baseline simulations. As expected, there were differences in ozone concentrations on Saturday and Sunday (July 2 9 and 30). The simulation showed lower ozone in the urban areas, but higher ozone in the downwind areas on Saturday and Sunday. However, by about 10 am on Monday (July 31 ), there are no differences between

the two simulations. The simulations showed that e ven when on-road motor vehicle emissions for a weekday were substituted for a week end day, there was virtually no effect on the weekday ozone concentrations.

### ___________________________________________________ ___________________ A-49 Caltrans staff described an analysis of Weigh-In-Mo tion (WIM) data that they had conducted about two years ago to compare weekend and weekday traffic counts for heavy-duty vehicles ( ≥ 5 axles). Caltrans staff reviewed data for Southern California and the San Joaquin Valley. Staff’s findings showed a drop of about 25% on weekend days in the San Joaquin Valley. Caltrans staff agreed to share thei r analysis with the group.

The group discussed the possibility of developing h ourly profiles from the WIM data. In the development of the current on-road motor vehicle mo deling emission inventories, data were used that were developed by Dr. Niemeier of UC Davi s based on data gathered during the CCOS field study in 2000. Dr. Niemeier developed t wo hourly profiles, one for weekdays and one for weekend days. However, the hourly prof iles made no distinction by vehicle type. The group decided to form a sub-committee to investigate how WIM data could be used to improve the modeling inventories. Caltrans staff volunteered to coordinate the subcommittee that would also include representatives f rom the BAAQMD, MTC and Alpine Geophysics.

3. Documentation of Modeling Emission Inventory ARB reported that they have received two comments, both from staff at the BAAQMD. One set of comments was made by Amir Fanai and related to on-road motor vehicle emissions. At ARB’s request, Jim Wilkinson of Alpine Geophysic s responded to Mr. Fanai’s questions. Mr. Fanai said that he was satisfied with the respo nses. ARB briefly described the questions and responses. ARB will distribute the q uestions and responses to the group. The emission inventory documentation and ITN report will be updated to reflect the questions and responses.

Phil Martien provided the second set of comments. At the meeting, ARB highlighted Mr. Martien’s comments. ARB staff said that they plan to incorporate most of the comments into the emission inventory documentation. Mr. Martien suggested including a Methods Assessment section that evaluates the inventory sho wing strong points as well as where methods could be improved. ARB said that the purpo se of the documentation is to specify how the gridded inventories were developed, not nec essarily to evaluate the quality of the inventory. ARB will discuss whether or not the emi ssion inventory documentation is the appropriate place to include such an evaluation.

ARB is continuing to expand the inventory documenta tion, which will include the comments made by BAAQMD staff. ARB will post a new version when substantial changes have been made. The group is still encouraged to provide comm ents in writing to Cheryl Taylor of ARB ( cataylor@arb.ca.gov ).

4. Attainment Modeling The group discussed the availability of control fac tors from proposed control measures to use in attainment modeling runs. ARB has received control factor information from San Joaquin Valley staff for 2005, but is still waiting on information for 2010. SJVUAPCD staff said that they plan to provide the information soon . Sacramento Metro staff reported that they are working with the other districts in their nonattainment region to determine which control measures will be proposed. This needs to b e decided before control factors can be calculated. Control factors are not yet available for the Bay Area.

5. Policy Issues: Wildfires District staff reported that there had been no chan ge with regards to the issue of how to address wildfires in future year modeling runs. The group agreed to drop this item from future agendas.

### ___________________________________________________ ___________________ A-50 6. Update on Status of Gridded Inventory ARB reported that revised modeling inventories for point and area sources are now available for the July/August 2000 episode. The latest modeling file names all contain “rf934” for ARB’s Emission Inventory Branch reference # 934 and conta in “V012004” or “V022104” for version dates. ARB described a spreadsheet sent to the grou p showing emission differences for NOx and TOG by region between the July 2003 and January 2004 modeling inventories. A description of the main changes is listed on each s preadsheet. Based on an August weekday, the differences in NOx emissions for the San Joaqui n Valley, Bay Area and Sacramento Nonattainment region are –6 tpd, -12.9 tpd, and +2. 4 tpd, respectively. Similarly, the differences in TOG emissions for the same regions a re +15.6 tpd, +19.3 tpd, and +33.2 tpd, respectively. All other modeling files remain unch anged.

7. Other Issues
Sacramento Metro AQMD staff raised a concern about idling emissions from construction equipment. They have been looking at potential emi ssions reductions from local ordinances that would limit idling. ARB staff reported that i dling emissions are included in the inventory. Emissions factors for diesel construction equipment in the OFFROAD model are based on a steady state 8-mode cycle, one of which is idling. Idling emissions are included in the inventory, but they cannot be reported separately right now. Sacramento Metro staff expressed concern that idling emissions in the OFFROAD model may be u nderestimated similar to idling emissions in the on-road inventory. SJVUAPCD staff also fel t that idling emissions are underestimated, not only from construction equipment but also from other types of equipment such as agricultural/farm equipment. ARB staffs who handle the OFFROAD model will be asked to join

the next call to discuss the districts’ concerns. District staff would like to understand the basis for the ftp cycle used to develop the emission fact ors and to know if ARB plans to investigate this subject further. Additionally, Caltrans staff mentioned that there is a current study on offroad vehicles being conducted by Parks and Recreati on; they will send more information to be distributed to the group.

8. Plans for Next Meeting The next conference call is scheduled for Wednesday , February 25 at 10:00 a.m.



## February 25, 2004

Attendees Affiliation
Amir Fanai, Toch, Mangat, Phil Martien, Saffet Tanr ikulu Bay Area AQMD Charles Anderson, Kristian Damkier, Bruce Katayama, Mike Neuenburg, Greg Tholen Sacramento Metro AQMD

David Nunes, Stephen Shaw, Michelle Stanley San Joa quin Valley Unified APCD
Vahid Nowshiravan, Leonard Seitz Caltrans

Jim Wilkinson Alpine Geophysics

Cari Anderson Earth Matters Archana Agrawal, Paul Allen, Vernon Hughes, Tess Si cat, Cheryl Taylor, Eugene Yang ARB

1. Welcome and Feedback on February 11 Meeting ARB welcomed everyone to the call. Introductions w ere made. The minutes were accepted as

written.

### ___________________________________________________ ___________________ A-51 2. Idling Emissions from Construction Equipment Previously, Sacramento Metro AQMD staff raised a co ncern that idling emissions from construction equipment may be underestimated in the inventory. They are particularly concerned about extended idling, especially since m any new types of construction equipment

now include “creature comforts” such as air conditi oning and radios. Sac Metro staff have been looking at potential emissions reductions from loca l ordinances that would limit idling. The group asked that ARB staff join this call to discus s the current emission estimation method in the OFFROAD model and any plans that ARB may have t o investigate this subject further.

ARB staff reported that idling emissions are includ ed in the inventory. Emission factors for diesel construction equipment in the OFFROAD model are based on a steady state 8-mode cycle, one of which is idling. Idling emissions ar e included in the inventory, but they cannot be reported separately right now. However, the weight ing factor for idle in the 8-mode cycle is 15%. ARB recently put GPS data loggers on 4 pieces of construction equipment, none of which had “creature comforts.” Data have been collected, but not analyzed yet. Since this is a very small sample, it is unknown how representative the 15% weighting factor is of “real world” conditions. Sacramento Metro staff said that they had not collected any data on idling emissions from construction equipment. ARB has no plans at this time to change the OFFROAD model because there is not enough informati on available to warrant a change. No additional tests are planned in the near term. AR B staff is aware that the emissions from construction equipment are large (9% of total NOx s tatewide in 2010) and would like to gather more information. The group encouraged ARB staff t o do more testing. ARB staff will keep the group informed when new data become available.

BAAQMD staff asked for clarification of the revisio n to the growth factors for locomotives. At the last meeting, ARB described a spreadsheet that show ed the emission differences for NOx and TOG by region between the July 2003 and January 200 4 modeling inventories. A description of the main changes was listed on each spreadsheet, on e of which related to locomotives. ARB staff agreed to work with BAAQMD staff to explain t he calculations.

3. Possible Uses of Weigh-In-Motion (WIM) Data Caltrans staff described calculations that they had distributed to the group. At the request of South Coast AQMD staff, Caltrans staff had previous ly calculated an annual weekend/weekday heavy-duty truck volume ratio. They extracted the raw data (daily files by location) from the WIM server at the Caltrans Headquarters Traffic Ope ration’s office and calculated the weekend/weekday truck volume ratios by site. Only those WIM sites located either in the SCAB region or in the near vicinity were used. Variatio ns in the weekend/weekday ratios were

observed between locations and month.

The group discussed the possibility of developing h ourly profiles from the WIM data. The current on-road motor vehicle modeling emission inv entories used profiles that were developed by Dr. Debbie Niemeier of UC Davis. Dr. Niemeier d eveloped two hourly profiles, one for weekdays and one for weekend days with no distincti on by vehicle type. Caltrans Traffic Operations posts daily summaries by station and cla ss on their website. However, hourly profiles cannot be developed from the summaries. C altrans staff mentioned that it might be possible to ask Caltrans Traffic Operations staff t o save the raw data from a few stations (5-10) if they were asked about three months ahead of time . The group formed a sub-committee to explore with Caltrans the gathering of WIM data thi s summer; Caltrans staff will set up a

conference call soon. Caltrans staff volunteered t o coordinate the sub-committee that would also include representatives from the BAAQMD, MTC, ARB and Alpine Geophysics. The URL

### ___________________________________________________ ___________________ A-52 for Caltrans Division of Traffic Operations is: 

### http://www.dot.ca.gov/hq/traffops/ . Selecting

Truck Services will select the Office of Truck Services within Ca ltrans.

ARB staff agreed to distribute 2001 statewide WIM d ata. ARB staff reminded the group that even though weekend adjustments can be made for on- road mobile sources, the spatial distribution is still based on weekday transportation models (e.g. people are still trave ling to work; the emissions are just scaled down).

4. Comments on the Integrated Transportation Netwo rk (ITN) Report ARB staff said that they have received no new comme nts on the ITN report. Caltrans staff

mentioned that the new Caltrans statewide model has an improved coverage that is in Teale Albers. This new coverage is more compatible with the bulk of GIS data being used within State agencies. Caltrans will send specific comments on the ITN report to Alpine Geophysics.

5. Comments on the Draft Documentation of Modeling Emission Inventory ARB staff said that they have received no new comme nts since the last call. As requested at the last meeting, ARB distributed the questions ask ed by Mr. Fanai, BAAQMD, and the responses made by Jim Wilkinson of Alpine Geophysic s. The emission inventory documentation and the ITN report will be updated to reflect the questions and responses.

Phil Martien, BAAQMD, also provided comments that w ere discussed at the last call. ARB staff reported that they are incorporating most of the co mments into the emission inventory documentation. ARB will post a new version when su bstantial changes have been made. The group is still encouraged to provide comments to Ch eryl Taylor of ARB ( cataylor@arb.ca.gov ).

6. Attainment Modeling The group discussed the availability of control fac tors from proposed control measures to use in attainment modeling runs. ARB staff has received c ontrol factor information from San Joaquin Valley staff for 2010. ARB and SJVUAPCD staffs are working to determine that emission reductions are as expected and occur in the correct emission inventory categories. Sacramento Metro staff reported that they are closer to agreem ent with the other districts in their nonattainment region to determine which control mea sures will be proposed. This needs to be

decided before control factors can be calculated. Control factors are not available for the Bay

Area at this time.

7. Update on Status of Gridded Inventory ARB reported that revised modeling inventories for area sources (base year) are now available for the July/August 2000 episode. These revised in ventories now include livestock waste emissions that were inadvertently dropped during pr ocessing. Ten new livestock waste categories were recently created that separate the emissions by animal type, such as dairy cattle, broiler chickens and swine. All other mode ling files remain unchanged.

8. Other Issues ARB mentioned that Alpine Geophysics recently provi ded a draft final report on contract 03- 01CCOS to develop the September 2000 CCOS episode. Within the time and resource constraints of this project, Alpine Geophysics was unsuccessful in developing a SIP-quality ozone modeling episode satisfying EPA performance g oals and established scientific practice. The final report focuses on the range of hypotheses tested and the diagnostic experiments performed to explore the model performance issues. The report suggests the conduct of a focused review of emissions inventory speciation as sumptions. ARB will be providing written

### ___________________________________________________ ___________________ A-53 comments on the draft final report. Alpine Geophys ics’ report can be found under the heading

“Contract Status” at 

### ftp://ftp.arb.ca.gov/carbis/ptsd/ccaqs_tac/ccaqs_ta c.htm

.

9. Plans for Next Meeting The next conference call is scheduled for Wednesday , March 17 at 10:00 a.m.



## March 17, 2004

Attendees Affiliation
Amir Fanai, Toch, Mangat, Phil Martien Bay Area AQM D Charles Anderson, Bruce Katayama, Greg Tholen, Brig ette Tollstrup Sacramento Metro AQMD

Donald Hunsaker, David Nunes, Stephen Shaw, Michell e Stanley San Joaquin Valley Unified APCD

Vahid Nowshiravan, Leonard Seitz Caltrans

Jim Wilkinson Alpine Geophysics

Cari Anderson Earth Matters Archana Agrawal, Paul Allen, Vernon Hughes, Tess Si cat, Cheryl Taylor, Eugene Yang ARB

1. Welcome and Feedback on February 25 Meeting ARB welcomed everyone to the call. The minutes wer e accepted as written.

2. Weigh-In-Motion (WIM) Data The group discussed the possibility of developing h ourly profiles from WIM data. The current on-road motor vehicle modeling emission inventories used profiles that were developed using CCOS-specific travel activity data collected under contract by Dr. Debbie Niemeier of UC Davis. Dr. Niemeier developed two hourly profiles, one for weekdays and one for weekend days with no distinction by vehicle type. ARB staff mentione d that they have received 2001 statewide WIM data from Caltrans, which they agreed to distri bute to the group. The group formed a subcommittee to explore the use of WIM data to develop new hourly profiles for both the light-duty and heavy-duty vehicles, perhaps by county or air b asin. The sub-committee, which includes representatives from Caltrans, BAAQMD, MTC, ARB and Alpine Geophysics, agreed to meet on April 6.

BAAQMD staff mentioned that they are working on an analysis using the hourly profiles from EMFAC. They plan to swap the light-duty and heavy- duty hourly profiles to see how the peak emissions change. ARB staff will investigate the s ource of the hourly profiles in EMFAC.

3. Comments on the Integrated Transportation Netwo rk (ITN) Report ARB staff said that they have received no new comme nts on the ITN report. ARB and Alpine Geophysics agreed that it is time to finalize the I TN report. ARB will compile the comments that have been received and send them to Alpine Geophysi cs to include in the final report.

ARB staff mentioned that the study agency is establ ishing a new contract with Alpine Geophysics to update the ITN, as approved by the CC AQS Policy Committee. The new contract will update available local transportation networks, including at a minimum the addition of the four northern counties in the San Joaquin Va lley.

4. Comments on the Draft Documentation of Modeling Emission Inventory

### ___________________________________________________ ___________________ A-54 ARB staff is revising the draft documentation of th e modeling emission inventory. The next revision will reflect the comments already received . ARB staff will distribute the revised document before the next meeting.

5. Attainment Modeling The group discussed the availability of control fac tors from proposed control measures to use in attainment modeling runs. ARB staff has received c ontrol factor information from San Joaquin Valley staff for 2010. ARB and SJVUAPCD staffs are working to determine that emission reductions are as expected and occur in the correct emission inventory categories. Control

factors are not available for the Sacramento Nonatt ainment Region or the Bay Area at this time.

6. Update on Status of Gridded Inventory ARB reported no changes to the modeling inventories

.

7. Other Issues BAAQMD staff reported that they are updating their district emission inventory files to reflect ARB’s correction to growth factors for locomotives.

8. Plans for Next Meeting The next conference call is scheduled for Wednesday , April 28 at 10:00 a.m.



## April 28, 2004

Attendees Affiliation
Amir Fanai, Toch, Mangat, Phil Martien Bay Area AQM D Charles Anderson, Bruce Katayama Sacramento Metro A QMD David Nunes, Stephen Shaw San Joaquin Valley Unifie d APCD

Harold Brazil MTC Wayne Luney Caltrans Chris Emery Environ Paul Allen, Vernon Hughes, Tess Sicat, Cheryl Taylo r, Bruce Tuter ARB

1. Welcome and Feedback on March 17 Meeting ARB welcomed everyone to the call. The minutes wer e accepted as written.

2. Weigh-In-Motion (WIM) Data

ARB staff summarized the WIM sub-committee conferen ce call on April 6; minutes were distributed to the group. Members of the WIM sub-c ommittee agreed to meet again on May 11 at 10:00. At that call, members will compile a lis t of questions to ask Caltrans. The purpose of the questions would be to gather more information a bout what kind of data the WIM stations can actually provide. In particular, the group is inte rested in how to relate WIM vehicle classes to EMFAC vehicle classes. Ultimately, the goal would be to develop separate hourly profiles for light-duty and heavy-duty vehicles from WIM data pe rhaps by county, air basin, or road name (e.g. I-5).

At the last meeting, BAAQMD staff mentioned that th ey were working on an analysis using the hourly profiles from EMFAC. They planned to swap t he light-duty and heavy-duty hourly profiles to see how the peak emissions change. BAAQMD staff agreed to share the results of the analysis of this group. BAAQMD staff did provide t heir analysis to ARB staff. ARB staff asked to review the information before sharing it with th e group.

### ___________________________________________________ ___________________ A-55 3. Comments on the Draft Documentation of Modeling Emission Inventory

ARB staff has revised the draft documentation of th e modeling emission inventory. The document was distributed to the group. The revisio n reflects most of the comments received previously. ARB staff described the major changes made from the December 17, 2003 version. ARB staff asked for written comments to be provided by May 21.

ARB staff mentioned that this report specifically d ocuments the modeling emission inventories developed for use in photochemical models to prepar e the 1-hour ozone SIPs. When completed, emission summaries and the names of mode ling files will reflect what was used for SIP development. This document will complete inven tory work for the 1-hour ozone SIPs.

ARB staff suggested that the focus of the SIP Gridd ed Inventory Coordination Group change to long-term improvements to the inventory that will b enefit upcoming 8-hour ozone and

PM 10 /PM 2.5 SIPs.

4. Update on Status of Gridded Inventory ARB reported no changes to the modeling inventories . This item will be dropped from future agendas until there is something new to report.

Environ staff mentioned that Alpine Geophysics (AG) staff are updating the July/August 2000 inventories to correct problems discovered in the e missions processing. These issues were corrected internally by ARB. AG will also be updat ing the July 1999 inventories. They will also substitute the speciation profiles from VISTA in pl ace of ARB’s profiles to see if there is any impact on model outputs.

5. Other Issues

No other issues were discussed.

6. Plans for Next Meeting The next conference call will be scheduled by ARB s taff after the May 21 comments have been

received.



## February 3, 2005

Attendees Affiliation
Amir Fanai, Toch, Mangat, Phil Martien, Saffet Tanr ikulu Bay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn, Briget te Tollstrup Sacramento Metro AQMD

Hector Guiero, Elena Nuño San Joaquin Valley Unifie d APCD Sam Longmire Northern Sierra AQMD Yu Shuo Chang, Dave Vince Placer County APCD Paul Hensleigh Yolo/Solano AQMD

Harold Brazil MTC

Leonard Seitz Caltrans Carol Bohenkamp EPA Michael Benjamin, Gary Honcoop, Vernon Hughes, Larr y Hunsaker, Doug Ito, Martin Johnson, Kurt Karperos, Cheryl Taylor, Doug Thompson, Bruce Tuter ARB

### ___________________________________________________ ___________________ A-56 1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Purpose of the SIP GICG Cheryl briefly described the purpose of the SIP Gri dded Inventory Coordination Group (GICG). The main purpose of the group is to provide the opp ortunity and means for interested parties, such as staff from districts, ARB, regional plannin g organizations (RPOs), and their consultants, to review gridded inventories to be used in SIP mod eling.

A similar process was used during modeling for the 1 hour SIP, which provided several benefits. First, the more people who review the inventories, the more likely they will spot problems quickly. Also, more reviewers can also share the b urden of reviewing such large amounts of

information. Another benefit is that the districts have specific knowledge about the inventories in their regions, so they are more likely to discov er problems. Lastly, the group provided a forum to discuss desired inventory improvements and concerns.

3. Modeling Schedule/Frequency of Calls ARB will be making model runs for the placeholder m odeling, with expected completion by the end of summer. Placeholder modeling will use inven tory inputs that were previously developed for 1-hour SIP modeling coupled with adjustment fac tors to best characterize inventory changes that have occurred since then. Late this summer, A RB anticipates developing revised gridded inventories for point and area sources that will be based on the 2002 base year inventory. In order to meet that deadline, ARB is asking for dist rict submittals of revised inventory information by March 31. Growth and control changes are reques ted by May 1. On-road motor vehicle inventories will be developed using EMFAC2005.

Cheryl mentioned that the frequency of calls would be scheduled as needed, probably on the order of every two to four weeks.

4. Process to Create a Gridded Inventory Cheryl told the group that ARB would be sending out a brief overview of how gridded inventories are developed. The intent is to provide informatio n to those who are new to this process. Cheryl described the general process for developing modeling inventories for each of the four types of sources: point sources, area sources, on- road motor vehicles and biogenics.

5. Modeling Inventory Q/A Flow Diagram Cheryl mentioned that ARB would be sending out a Q/ A flow diagram. This diagram shows the flow of point and area source inventory data from t he districts to ARB, the subsequent use of the data, information that is developed from them (e.g. reports and modeling inventories) and where Q/A happens in the process.

Michael Benjamin and Martin Johnson (Emission Inven tory Branch, ARB) described the where
QA occurs and what kind of QA is done. For QA of t he base year, many types of checks occur. The facility locations checked for missing coordina tes. For those facilities that do have coordinates reported, a comparison is done with geo coded coordinates based on address. Area sources are checked for completeness. Additio nally, temporal data, SIC/SCC assignments, and the variability between years are checked. For future year QA, growth and control are checked. “Growth only” scenarios are r un to check the forecasts for reasonableness. Control rule factors provided by t he districts are evaluated at the SIC/SCC level. The projections using both growth and contr ol and reviewed for reasonableness.

### ___________________________________________________ ___________________ A-57 There are several web pages available for review of these various data. The almanac website

contains considerable information and can be found at: http://www.arb.ca.gov/aqd/almanac/almanac.htm. The Almanac contains 20-year trend summaries of air quality and emissions data for fiv e criteria pollutants: ozone, PM10, CO, NO2,

and SO2. Another useful website is the SIP baselin e emission inventory projections. The site was prepared to assist ARB and district staff in th e timely retrieval of emissions inventory information to aid in the 1-hour ozone SIP developm ent process for the CCOS domain. The page provides report generators on various point an d area source inventories generated for modeling. The site also contains documentation of changes in different versions of the inventory. The URL is: http://www.arb.ca.gov/app/e msinv/ccos/index.php. A similar website is being developed to aid staff in the 8-hour ozone SI P process.

6. Method to Develop Placeholder Episode Emissions Placeholder modeling will use inventory inputs that were previously developed for 1-hour SIP modeling coupled with adjustment factors to best ch aracterize inventory changes that have occurred since then. For point and area sources, t he emissions will use the CEFS runs developed in January 2004 (RF#934). On-road motor vehicles are based on EMFAC2002 v2.02. Biogenics have remained unchanged since Sep tember 2003. Future year modeling inventories have been developed for 2007, 2012 and 2018. ARB will be making gross adjustments to the on-road and off-road inventories to reflect the approximate changes in

EMFAC and the OFFROAD models. The 1999 and 2000 ba se years will be recreated to account for the changes as well. Inventories will be ready for review in the next two to three weeks. Members of the group asked to review the mo deling inventories both before and after the gross adjustments are made.

7. QA/QC Process Phil described the proposal for tracking and report ing of modeling emissions inventories. Staff from the BAAQMD and ARB has been discussing ways to improve the tracking and reporting of modeling inventories. During the previous 1-hour o zone SIP process, many modeling inventories, emissions summaries and plots were mad e available for review. A log file was maintained that described changes. As time went on , it became difficult to maintain descriptive logs, logical file structures and up-to-date summar ies and plots. It became confusing for staff to

determine which was the latest information.

Staff’s proposal includes three parts. The first p art is to standardize file names and directory structures. The second part is to develop methods to automate the tracking and reporting of modeling inventories. This would involve logging i n information about each new modeling file that becomes available, including an option to look up “current” files. Emissions summaries and plots would be generated automatically. The third part is to improve the accessibility of files, summaries and graphics via standard web browsers. More information will be provided to the group when it is available.

8. Suggested ARB/District Responsibilities Cheryl made suggestions for ARB and district staff responsibilities related to reviewing modeling inventories. Suggested ARB staff’s responsibilitie s include maintaining the base year and future year databases (CEIDARS and CEFS). ARB staff would be responsible for posting modeling files and reports/plots to the appropriate websites and ftp sites. District staff is responsible for providing point source, growth and control data, in cluding QA. If resources are available, district staff is encouraged to review CEFS reports, gridded summaries and tile plots. District staff is requested to provide comments to ARB staff within 2 weeks of notification. Members of the group made no comments.

### ___________________________________________________ ___________________ A-58 9. Website and FTP Site Information on existing websites is described in It em 5, above. More details on websites and ftp sites will be provided, as information becomes avai lable.

10. Contact List Vernon asked each district if they could provide a single person to contact when information is available for review. The following staff voluntee red: Sam Longmire, Northern Sierra Paul Hensleigh, Yolo/Solano Yu Shuo Chang, Placer Elena Nuño, SJV Hao Quinn, Sac Metro Phil Martien, Bay Area Leonard Seitz, Caltrans

11. Plans for Next Meeting

The next conference call will be scheduled when the summaries and tile plots for the placeholder gridded inventories are available for r eview.



## March 16, 2005

Attendees Affiliation
Christina Archer, Amir Fanai, Toch, Mangat, Phil Ma rtien, Cuong Tran Bay Area AQMD

Hao Quinn Sacramento Metro AQMD Gary Arcemont, Debbie Johnson, David Nunes, Elena Nuño, Stephen Shaw San Joaquin Valley Unified APCD

Cari Anderson CA Consulting Chris Emery Environ Paul Allen, Vernon Hughes, Martin Johnson, Anne Lin

, John Nguyen, Cheryl Taylor, Bruce Tuter ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of February 3 Meeting Highlights

The meeting highlights were approved as written.

3. Review of Placeholder Episode Emissions

Schedule ARB will be making model runs for the placeholder m odeling, with expected completion by the end of summer. Placeholder modeling will use inven tory inputs that were previously developed for 1-hour SIP modeling coupled with adjustment fac tors to best characterize inventory changes that have occurred since then. Late this summer, A RB anticipates developing revised gridded inventories for point and area sources that will be based on the 2002 base year inventory. In order to meet that deadline, ARB is asking for dist rict submittals of revised inventory information by March 31. Growth and control changes are reques ted by May 1. On-road motor vehicle inventories will be developed using EMFAC2005.

### ___________________________________________________ ___________________ A-59 What’s Available and How to Access Information Cheryl reviewed the draft document “Accessing and R eviewing Placeholder Modeling Files and Reports”. Modeling files and reports can be access ed through a web browser ( ftp://orthus.arb.ca.gov/pub/ ) or directly to ARB’s ftp site (Host Name: orthus. arb.ca.gov; User ID: ftp; Password: leave blank or put in anything). There are two main subdirectories that contain data for both the July 1999 episode and the July/August 2000 episode. There are four years available for each episode – the base year (e ither 1999 or 2000) and 2007, 2012 and 2018. For each year and episode, there are model-r eady files and three types of reports: EIC, speciation and tile plots. The document discusses the reports in detail. Currently, all of the reports are for the inventories before any gross inventory adjustments have been applied.

ARB is preparing modeling files that will incorpora te gross inventory adjustments. These adjustments will be applied to all years (1999, 200 0, 2007, 2012 and 2018) for both episodes by pollutant (ROG and NOx) by region (SJV, SNA and SF) . There are individual factors for onroad, off-road, stationary and area-wide that will be generally applied equally to all sources within each category. There are two exceptions. F irst, a separate factor will be applied to NOx from locomotives in the SJV and SNA; a different fa ctor will be applied to the remaining off-road NOx sources. Second, NOx from ships in SF will be handled in the same manner as

locomotives.

ARB estimated the gross adjustments to the on-road and off-road inventories to reflect the expected changes in the next versions of the EMFAC and OFFROAD models. The local districts provided stationary and area-wide adjustm ents.

ARB recently posted the modeling files for the 1999 base year of the July 1999 episode after the gross adjustments were applied. The files can be f ound on the ftp site under /pub/outgoing/shareddata/Placeholder_Modeling/ as s hown in the directory structure below. At the last meeting, members of the group asked to rev iew the modeling inventories both before and after the gross adjustments are made. The CAMx model-ready files are available for both before and after the gross adjustments for area, mo bile and point sources. Additionally, ARB will mail a hard copy report to the appointed conta ct person at each district participating in this group. The report sums the emissions and shows the percent change before and after the gross adjustments have been applied.

District staff made suggestions for improving the r eview of the reports. Staff asked if blanks could be removed from all directory names; ARB will make this change. ARB will develop a log

### ___________________________________________________ ___________________ A-60 file to track the posting of names and dates until the procedure can be handled automatically. District staff asked if the EIC reports could be pu t into Excel rather than the current SAS output; ARB will investigate this.

Timely Feedback to ARB To aid everyone in keeping track of what informatio n is currently available for review/use on the ftp site, ARB will post a log showing what was post ed and when. When new information is available (modeling files or reports), ARB will sen d out an email notifying the appointed district contacts. The district contacts can then notify th e appropriate staff at their district. District st affs

are asked to review the information within two week s and notify ARB of any concerns. ARB suggested developing a matrix of reports and names of staff who had reviewed the reports. This matrix would be sent out periodically to ensur e that the inventory information has been

reviewed.

4. Plans for Next Meeting The next meeting is scheduled for Wednesday, March 30 from 10 to 11:30 am.

5. Other Discussion BAAQMD and ARB staff discussed the incorporation of the latest growth and control information provided by the BAAQMD in January 2005. They will continue working cooperatively to include this new data and review the results for accuracy.



## April 5, 2005

Attendees Affiliation

Phil Martien Bay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn Sacrame nto Metro AQMD Gary Arcemont, Debbie Johnson, David Nunes, Elena

Nuño San Joaquin Valley Unified APCD

Harold Brazil MTC Charles Chenu, Leonard Seitz Caltrans Headquarters Chris Emery Environ Michael Benjamin, Vernon Hughes, Anne Lin, Tess Si cat, Cheryl Taylor ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of March 16 Meeting Highlights The meeting highlights were approved as written.

3. Review of Placeholder Episode Emissions

What’s Available ARB will be making model runs for the placeholder m odeling, with expected completion by the end of summer. Placeholder modeling will use inven tory inputs that were previously developed for 1-hour SIP modeling coupled with adjustment fac tors to best characterize inventory changes that have occurred since then. Late this summer, A RB anticipates developing revised gridded inventories for point and area sources that will be based on the 2002 base year inventory.

ARB was asked to provide the status of emission inv entory updates. ARB had requested that the districts provide point and area source updates for the 2002 base year by March 31. Updates supplied by that time were guaranteed to be included in the inventory that will be used

### ___________________________________________________ ___________________ A-61 for final SIP modeling. Many districts have submit ted 2002 updates as well as growth and control information. ARB agreed to provide to the group for the next meeting a list of which districts have provided updates. ARB plans to begi n forecasting from the 2002 database in early June; it will be difficult to incorporate any updates after that time.

ARB has posted modeling files and reports for the i nventories before any gross inventory adjustments have been applied. ARB has also posted modeling files that incorporate gross inventory adjustments. These adjustments were appl ied to all years (1999, 2000, 2007, 2012 and 2018) for both episodes (July 1999 and July/Aug ust 2000) by pollutant (ROG and NOx) by region (SJV, SNA and SF).

ARB estimated the gross adjustments to the on-road and off-road inventories to reflect the expected changes in the next versions of the EMFAC and OFFROAD models. The local districts provided stationary and area-wide adjustm ents.

ARB was asked to explain how the gross adjustments were applied to locomotives for the placeholder modeling. The gross adjustment factor for locomotives (1.40) was applied to NOx emissions with an EIC that began with 820 for all c ounties in the Sacramento Nonattainment Area. All other off-road categories (beginning wit h EIC of 8) were assigned a factor of 1.06. Spreadsheets containing the gross adjustment factor s and the emission category to which they were applied will soon be available for download fr om ARB’s ftp site for each year, region and pollutant. ARB has recently released a memo descri bing the changes that are planned for

locomotive emissions in the OFFROAD model. The mem o can be found at: http://www.arb.ca.gov/msei/on-road/downloads/docs/L ocomotive_Memo.doc . More information on changes to EMFAC and OFFROAD at their upcoming release can be found at: http://www.arb.ca.gov/msei/msei.htm

.

Additionally, ARB will soon be posting “before and after” reports. These reports show emissions before and after the gross adjustments were applied and the percent change by air basin, pollutant, emission category and county. District staff can review the reports to check emission totals and determine that gross adjustments were ap plied correctly.

How to Access Information District staff reported that they have been success ful in downloading files from ARB’s ftp site. The site can be accessed with the following informa tion:

Host Name : orthus.arb.ca.gov

User ID : ftp

Password : put in your email address.

Information can be found on the ftp site under /pub /outgoing/shareddata. Modeling files and reports are located under “Placeholder_Modeling”. The gross adjustment factors will be under “Gross_Adjustment_Factors.” There is also a log fi le (“Log_File_ Current Date .xls) that describes what information has been posted to or re moved from the ftp site. ARB and BAAQMD staffs are developing an automated way of ke eping track of ftp site activity; the log file

will serve that function until the automated method is completed.

Comments on Modeling Inventory Currently Available At previous meetings, members of the group were ask ed to review available modeling inventories and reports. ARB asked districts to re view the inventories and provide comments next week to the group. BAAQMD staff mentioned tha t they see less VOC in the latest

### ___________________________________________________ ___________________ A-62 modeling files for the July 1999 episode (1999 base year) than in previous runs. ARB is investigating this concern.

District staff made suggestions for improving the r eview of the reports. Staff asked if blanks could be removed from all directory names; ARB has made this change. District staff asked if the EIC reports could be put into Excel rather than the current SAS output; ARB is investigating this. District staff suggested that the ranges in the tile plots be improved. It can be very time consuming to play with ranges in plots. ARB will l ook into posting files that can be read into PAVE so those reviewers can choose their own ranges or focus on individual categories. ARB will also post tile plots of mobile sources.

4. Plans for Next Meeting The next meeting is scheduled for Tuesday, April 26 from 10 to 11:30 am.

5. Other Discussion

ARB was asked if emissions from Nevada have been co nsidered for inclusion in the modeling inventories. Perhaps emissions from the National E mission Inventory (NEI) or the Western Regional Air Partnership (WRAP) could be used. ARB will investigate and report back on what

could be done to “fill in” Nevada.



## April 26, 2005

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien, Cuong Tran B ay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn Sacrame nto Metro AQMD Gary Arcemont, David Nunes, Elena Nuño San Joaquin Valley Unified APCD Paul Hensleigh Yolo-Solano AQMD

Harold Brazil MTC

Jim Wilkinson Alpine Geophysics Michael Benjamin, Vernon Hughes, Anne Lin, Cheryl Taylor, Bruce Tuter ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of April 5 Meeting Highlights The meeting highlights were approved as written.

3. Status of District Point and Area Source Updates for 2002 As requested by the group at the previous call, Mic hael Benjamin gave the status of district point and area source updates for the 2002 inventor y. Most districts originally submitted their point and area source inventories about 18 months a go. Since the 2002 CEIDARS inventory will be the basis for modeling inventories for the 8-hour ozone SIPs, additional QA was requested from the districts.

On September 15, 2004, ARB presented information at an EITAC (Emission Inventory Technical Advisory Committee) meeting to aid the di stricts in their QA efforts. Data provided at the meeting can be downloaded at http://www.arb.ca.gov/ei/district/eitac2004.htm . ARB requested that district staff review: 1) point and area source criteria emissions, 2) facility locations, 3) temporal assignments, and 4) growth s urrogates and control factors.

### ___________________________________________________ ___________________ A-63 Michael reviewed a table that was distributed to th e group showing the status of each of the four QA areas by district. In general, the larger distr icts performed QA checks more than smaller

districts. Several districts reviewed their emissi on estimates and facility locations. Few districts reviewed temporal data, growth surrogates or contro l factors. Collectively, more QA was performed than in previous inventories, but not as much as ARB had hoped. Districts were asked to notify Michael if the table was not correc t. For facility locations that are missing or highly suspect, ARB is considering using default lo cations developed through geocoding using GIS. ARB is also considering using default tempora l data of 8 hr/day for point sources when temporal data are incomplete.

ARB wants the best inventory possible for the SIPs. Changes to temporal, growth and control data are requested by May 1, but ARB is willing to work with districts as much as possible to make revisions to the 2002 inventory.

4. Review of Placeholder Episode Emissions

What’s Available ARB gave the status of information that has been po sted on the Orthus ftp site since the April 5 meeting. The next four items describe what has bee n posted.

1) ARB posted the gross adjustment factors. Placeh older modeling is using inventory inputs that were previously developed for 1-hour SIP model ing coupled with gross adjustment factors. These adjustments were applied to all years (1999, 2000, 2007, 2012 and 2018) for both episodes (July 1999 and July/August 2000) by pollut ant (ROG and NOx) by region (SJV, SNA and SF). ARB estimated the gross adjustments to th e on-road and off-road inventories to reflect the expected changes in the next versions of the EM FAC and OFFROAD models. The local districts provided stationary and area-wide adjustm ents.

2) ARB posted modeling files that incorporated gros s inventory adjustments for 2018 for both episodes.

3) ARB reposted modeling files that incorporated gr oss inventory adjustments for 2012 for both episodes. The files corrected an error in the head er record so that CAMx could read the files.

4) ARB reposted modeling files for area sources that incorporated gross inventory adjustme nts for 1999, 2007 and 2012 for the July 1999 episode. Point, mobile and biogenics files were unchanged. The area source files were rerun to cor rect a problem that was found. During processing of the July 1999 episode earlier this ye ar (based on inventory reference #907), the cross-reference file (created for inventory referen ce #934) was used. Some codes were inadvertently left out causing some emissions to be dropped. Because of this problem, area source modeling files and reports posted as “before gross adjustments” are incorrect due to missing emissions.

Additionally, ARB will be posting more information by the end of the week, described in the following two items.

1) ARB will repost modeling files for area sources that incorporate gross inventory adjustmen ts for 2018 for the July 1999 episode to correct the p roblem mentioned in item 4 above.

2) ARB will post reports for all years for the July 1999 episode to ensure that the latest versions are available. Speciation reports for the “after g ross adjustments” will be posted along with

### ___________________________________________________ ___________________ A-64 “before and after” reports. The “before and after” reports show emissions before and after the gross adjustments were applied and the percent chan ge by air basin, pollutant, emission category and county.

Comments on Modeling Inventories Currently Availabl e At previous meetings, members of the group were ask ed to review available modeling inventories and reports. ARB received several comm ents/questions from Sacramento Metro AQMD. ARB responded in an email to questions about how to interpret the EIC reports. Since similar questions may arise from other district sta ff, following are two questions from Sac Metro staff and ARB’s responses.

1) One question referred to on-road NOx emissions. Sac Metro staff said that they summarized the gridded inventory by area, point and on-road fo r each model day along with CEFS 2000 summer planning inventory (1999 base year forecast) for comparison. The data look reasonable except for ON-ROAD NOx which seem low re lative to the other pollutants for weekend days. ARB responded that NOx emissions loo k low because ARB applies a NOx correction factor for heavy-duty diesels on weekend s that reflects a fairly significant drop from weekday levels.

2) Sac Metro staff wondered about the EIC reports f or agricultural burning. First, why is DROPPED_CEFS much larger than BASE_CEFS and second, if there is no ag burn activity on the episodic days, why are there gridded emissions on those days? ARB investigated their questions. The EIC report does indeed show that the emissions being dropped are bigger than the original amount. This is an error in the repor t. For this category, the BASE_CEFS emissions were underreported. The emissions that a re reported as being dropped during processing are correct. Per instructions from the district, the emissions from weed abatement and ag burning from prunings and field crops were r eplaced with day-specific data. For the days in the July/August 2000 episode, no ag burning happened to occur. The emissions reported in the gridded output in the waste burning category related to non-ag open burning that were not replaced by day-specific data. So even th ough part of the report is incorrect, the good news is that the correct amount did go into the mod eling inventory.

Sac Metro staff asked how their new source, Consumn es power plant, will be incorporated into the modeling inventory. The power plant is schedul ed to begin operation in 2006. ARB’s Emission Inventory staff has the emission estimates . ARB Modeling staff will include the emissions as external adjustments (added to the inv entory) for the 2007, 2012 and 2018 modeling inventories. ARB will let Sac Metro staff know when the emissions have been

included.

Sac Metro staff asked how rice straw burning ERCs w ill be handled in the modeling inventories. ARB responded that the process has not yet been dec ided, but the subject would be discussed at the June 2 Northern California SIP/Transport mee ting. Sac Metro staff wants ERCs to be included in the modeling.

ARB asked other district staff who has not provided comments to review the inventories and provide comments within the next two weeks to the g roup. ARB would like to respond to comments before the June 2 meeting.

BAAQMD staff mentioned previously that they see les s VOC in the latest modeling files for the July 1999 episode (1999 base year) than in previous runs. ARB reported that their emissions

### ___________________________________________________ ___________________ A-65 comparison matched well between the July 1999 model ing files and the outputs from CEFS (reference #907).

4. Plans for Next Meeting The next meeting is scheduled for Tuesday, May 17 f rom 10 to 11:30 am.

5. Other Discussion

ARB was asked if emissions from Nevada have been co nsidered for inclusion in the modeling inventories. Data from the Western Regional Air Pa rtnership (WRAP) appears to be the only readily available source. ARB may incorporate data for Nevada for the final modeling.



## May 17, 2005

Attendees Affiliation
Toch Mangat, Phil Martien, Cuong Tran Bay Area AQMD Bruce Katayama, Hao Quinn Sacramento Metro AQMD Gary Arcemont, David Nunes, Elena Nuño San Joaquin Valley Unified APCD

Leonard Seitz Caltrans Headquarters

Jim Wilkinson Alpine Geophysics Chris Emery Environ Michael Benjamin, Vernon Hughes, Kyriacos Kyriacou

, Anne Lin, Cheryl Taylor ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of April 26 Meeting Highlights The meeting highlights were approved as written.

3. Review of Placeholder Episode Emissions

What’s Available ARB reported that all modeling files after gross ad justments for the placeholder modeling are available on ARB’s Orthus ftp site. There are file s for the July 1999 episode (base year 1999 and future years of 2007, 2012 and 2018) and the Ju ly/August 2000 episode (base year 2000 and future years of 2007, 2012 and 2018). Since th e last call, ARB posted two items. First, the modeling files for area sources that incorporate gr oss inventory adjustments for 2018 for the July 1999 episode were reposted to correct the cros s-reference problem described in the April 26 minutes. Second, ARB posted reports for all yea rs for the July 1999 episode to ensure that the latest versions were available. Speciation rep orts for the “after gross adjustments” were posted along with “before and after” reports. The “ before and after” reports show emissions before and after the gross adjustments were applied and the percent change by air basin, pollutant, emission category and county.

Comments on Modeling Inventories Currently Availabl e ARB opened the floor for comments and questions on the gridded inventories and reports. BAAQMD staff asked about documentation for the gros s adjustments made to ships and

locomotives. ARB mentioned the documentation avail able from the March 2005 inventory workshop describing the proposed changes to the nex t versions of EMFAC and OFFROAD

models. The link for the Mobile Source Emission Inv entory webpage is: http://www.arb.ca.gov/msei/msei.htm . The link to the locomotive memo is: http://www.arb.ca.gov/msei/on-road/downloads/docs/L ocomotive_Memo.doc

### ___________________________________________________ ___________________ A-66 BAAQMD staff asked if the commercial shipping day-s pecific information was included in the placeholder modeling for the July 1999 and July/Aug ust 2000 episodes. At the BAAQMD’s request, Professor Bob Bornstein (San Jose State Un iversity) developed factors that scaled to daily amounts the shipping emissions based on the a nnual average inventory in CEIDARS for ships. Alpine Geophysics staff confirmed that they used the factors from Professor Bornstein to produce modeling inventories that included day-spec ific emissions for ships. ARB will check to see that the inventories produced by ARB contained day-specific shipping. [ARB has verified that day-specific shipping emissions are included i n the modeling inventories for both episodes.]

An update to the marine vessel inventory that will use one consistent method statewide is being considered. The topic will be discussed at the nex t EITAC meeting on May 19. ARB is hoping to get agreement by the districts on a methodology and include these emissions in the final SIP modeling inventories. It would then need to be dec ided if the day-specific factors developed by Professor Bornstein should be used. Alpine Geophys ics staff offered to provide the factors to ARB. [ARB has now received the day-specific shippi ng factors from Alpine.]

SJVUAPCD staff noted some problems with the EIC rep orts. They will follow up with an email providing the details. The EIC reports have some p roblems with the cross-reference files needed to assign emissions by EIC. ARB is working on generating similar reports that will replace the EIC reports. For the placeholder model ing, the “before and after” will replace the EIC reports. These reports show emissions by air b asin, pollutant, emission category and county. The emission category is the EIC1 level (f irst digit of the EIC code), which sums emissions into 10 categories (e.g. fuel combustion, solvent evaporation and other mobile sources).

The group discussed the question of whether agricul tural burning emissions should be included in future year inventories for SIP modeling. Unlik e wildfires, the districts regulate agricultural burns. On bad air quality days in the future, the districts are not likely to allow burning.

ARB was asked how future year modeling inventories are developed. Emissions are forecasted using CEFS, ARB’s forecasting system. Then emissio ns are disaggregated and speciated. ARB does not develop forecasted modeling inventorie s by applying growth and control factors to day-specific base year inventories.

BAAQMD staff compared the July 1999 modeling invent ories recently developed by ARB (rf#907) with the inventories developed for the BAA QMD by Alpine Geophysics. The temporal profiles look different for area sources. They not ed that the temporal distribution looks more realistic in the ARB #907 version, but the files de veloped by Alpine Geophysics had higher NOx

emissions.

Caltrans staff provided a few comments on the draft report on the development of the ITN version 2. He will provide comments directly to Al pine Geophysics.

District staff was asked to provide comments/questi ons on their reviews of the placeholder modeling inventories by May 27.

4. Plans for Next Meeting The next meeting is scheduled for Tuesday, June 14 from 10 to 11:00 am.

### ___________________________________________________ ___________________ A-67 

## June 14, 2005

Attendees Affiliation
Amir Fanai, Phil Martien, Cuong Tran Bay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn Sacrame nto Metro AQMD Gary Arcemont, Jessi Hafer, David Nunes, Elena Nuño San Joaquin Valley Unified APCD

Leonard Seitz Caltrans Headquarters

Jim Wilkinson Alpine Geophysics Michael Benjamin, Andy Delao, Anne Lin, Cheryl Tayl or ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of May 17 Meeting Highlights The meeting highlights were approved as written. [ Cheryl later noticed that the meeting highlights should have been for April 26, not May 1 7.] As a follow up from the last meeting, Cheryl mentioned two items from the minutes. First , ARB has verified that day-specific shipping emissions are included in the placeholder modeling inventories for both the July 1999 and July/August 2000 episodes. Second, an update is be ing considered to the marine vessel inventory that will use one consistent method state wide. ARB is hoping to get agreement by the districts on a methodology and include these emissi ons in the final SIP modeling inventories. If the update does occur, it would need to be decided whether the day-specific factors developed by Professor Bornstein should be used to develop da y-specific shipping emissions based on the new marine vessel inventory.

3. Review of Placeholder Episode Emissions

What’s Available ARB reported that there have been no new postings t o the ftp site since the May 17 call.

ARB is working on several new reports:

• One report will be very similar to the “before and after” reports. These reports sum gridded, hourly emissions by air basin, pollutant, EIC1 and county for area, point and on-road mobile sources. The EIC1 refers to the first digit of the EIC. These broad categories are: 0 – Fuel Combustion, 1 – Waste Disposal, 2 – Cleaning and Su rface Coatings, 3 – Petroleum Production and Marketing, 4 – Industrial Processes, 5 – Solvent Evaporation, 6 – Miscellaneous Processes, 7 – On-road Mobile, and 8 – Other Mobile. ARB suggests that the “before and after” reports be used for checking the gridded, hourly emissions to be used in the placeholder modeling instead of the EIC repo rts. The EIC reports list information by the EIC3 (the first 3 digits of the EIC) rather tha n the EIC1 level; otherwise the reports describe the same emissions. As noted previously, there have been some problems with the EIC reports due to cross-reference problems. A s a result, ARB proposes to use the EIC1 level for reporting until correct emissions ca n be displayed at the EIC3 level. As a reminder, the cross-reference problems only affect the reporting of emissions, not the quality of the placeholder gridded inventory.

• ARB is developing a report that will show the inco rporation of day-specific data. The emissions will be displayed at the EIC1 level.

• ARB is developing a report that will compare emiss ions before and after spatial and temporal adjustments are made in EMS-95 to ensure t hat no emissions are dropped during processing. The emissions will be displayed at the EIC1 level.

• ARB is working toward producing EIC3 level reports for each of the three reports described above for use in checking the final modeling invent ory.

### ___________________________________________________ ___________________ A-68 SJVUAPCD staff suggested that reports continue to b e posted as both text and csv files; csv files can be brought into Excel and viewed in a wid e variety of ways. Staff also mentioned that reports at the EIC3 level are valuable and encourag ed ARB to produce reports at that level as soon as possible.

Comments on Modeling Inventories Currently Availabl e ARB mentioned that they had received comments/quest ions on the placeholder modeling inventories from Sacramento Metro and San Joaquin V alley district staff. ARB has responded to the questions asked by Sac Metro. Comments prov ided by San Joaquin Valley staff were about concerns with the EIC3 reports and have been discussed at this and previous meetings.

Sac Metro staff asked how we will resolve the diffe rences between the modeling inventories for the July 1999 and July/August 2000 episodes since t hey are based on two different versions of the inventory (CEIDARS). ARB responded that the in ventories would be used as is in the placeholder photochemical modeling. The final mode ling inventories will be consistent since they will be developed from the new 2002 CEIDARS in ventory. For the final inventory the 1999 and 2000 base years for modeling will be backcast f rom 2002 for point and area sources. In addition, the final modeling inventories will be ba sed on new versions of EMFAC and

OFFROAD.

BAAQMD staff asked if ARB is planning to produce a 1990 inventory. Would members of the group want to go back and revisit the 1990 episode? ARB will look into it. [Note: One difficult part about revisiting the 1990 episode is comparing the original 1990 inventory with current versions of a 1990 inventory. This is because the original 1990 inventory was produced using the old categorization scheme. When CEIDARS was de veloped, the categorization scheme was revamped to more accurately display emissions. In the original categorization, emissions were reported as either stationary or mobile source s. The revised categorization created two new broad groupings called “Natural Sources” and “A rea-wide Sources”. Area-wide sources separated those stationary source emissions that we ren’t associated with a particular location, such as pesticides and architectural coatings. The se sources were separated out to draw attention to the large quantity of emissions, parti cularly TOG, from these categories. Most people associated “Stationary Sources” with facilit ies such as power plants and refineries and didn’t realize the very different types of control strategies needed between stationary and areawide sources. The problem for us now in comparing emissions between the old and new (current) categorization schemes is that it’s very difficult to tell whether a change in emissions is due to a change in emission estimation methodology or simply that those emissions are categorized in a different place. Revisiting the 1 990 modeling episode almost becomes an exercise in futility since it’s very difficult to u nderstand the changes in the inventory.]

BAAQMD staff mentioned that they had discovered an error in the biogenics inventory developed for the July 1999 episode. Due to a codi ng error, too much OVOC (other VOC) were included. A new biogenics inventory is being gener ated.

Leonard Seitz of Caltrans mentioned that he had rec eived truck data from Joe Avis (Caltrans). He has travel data from 137 piezo counters for 15 v ehicle classes. The travel data are by date

and hour. Leonard will forward the data to ARB aft er his review is complete. It may be possible to develop new weekend/weekday ratios for northern California that would replace the ratios currently used that were developed from southern Ca lifornia WIM station data.

### ___________________________________________________ ___________________ A-69 4. Other Issues At the suggestion of San Joaquin Valley district st aff, a new item will be added to the agenda for future calls. The agenda item will be “PM Inventor y Development.” Staff from the other districts agreed that keeping abreast of issues related to PM inventory development would be valuable. At the next call, ARB will give a status report of current PM inventory developments.

ARB reminded everyone that one of the main purposes of the SIP Gridded Inventory Coordination Group is to allow participants a venue for raising issues of concern about the inventory. Members of the group can provide input and comments that can lead to corrections and/or improvements in the inventory or explanation s that the inventory is ok prior to alarming policy makers of what may turn out to be a non-issu e. Unfortunately, raising too quickly what is eventually determined to be a non-issue can waste a lot of time and potentially affect the credibility of those involved.

Alpine Geophysics staff described a CCOS inventory analysis that they are conducting on behalf of the BAAQMD. One part of the analysis, wh ich was distributed to the group, is a comparison of intra-California emissions to determi ne if the inventory is consistent among like counties within the state. They are also planning to compare California’s inventory with a national inventory as well as the inventory develop ed by VISTAS. VISTAS (Visibility Improvement – State and Tribal Association of the S outheast) is a collaborative effort of the ten southeastern states and eligible tribes to conduct technical analyses and planning activities addressing regional haze and related air quality is sues. In conducting these analyses, Alpine Geophysics is looking for possible ways to create a better inventory in California. On the intraCalifornia comparison, ARB expressed concern about some of the source categories analyzed. Four of the categories (fuel combustion, petroleum extraction, solvent use and waste disposal) analyzed only area sources. These four categories have emissions in both area and point sources. A complete assessment cannot be made unti l all of the sources are included. Alpine Geophysics agreed to redo the analysis using both a rea and point sources and send it to the group. They will also share future analyses with t he group. Comments should be sent to Jim Wilkinson, Saffet Tanrikulu and Cuong Tran.

5. Plans for Next Meeting The next meeting is scheduled for Tuesday, July 12 at 10:00 am.



## July 21, 2005

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien, Cuong Tran B ay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn Sacrame nto Metro AQMD Gary Arcemont, David Nunes, Elena Nuño, Stephen Sha w, James Sweet San Joaquin Valley Unified APCD

Gordon Garry SACOG Vernon Hughes, Anne Lin, Cheryl Taylor ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of June 14 Meeting Highlights The meeting highlights were approved as written.

3. Temporal/Spatial Improvement Research Project

### ___________________________________________________ ___________________ A-70 ARB staff related that the CCOS technical committee is asking for input from the SIP Gridded Inventory Coordination Group (GICG) on a project it is considering. The project would be to improve temporal and spatial inputs used for disagg regating county-level emissions to grid cell, hourly emissions. The group discussed many of the following topics, including data that is currently available to support such improvements. Below is a list of ideas raised at the meeting and at previous meetings of the SIP GICG. These id eas will be passed along to the CCOS

Technical Committee for recommended inclusion in a proposed RFP.

Day-of-week Variations by Region Description: Improve how point, area and on-road mo tor vehicle sources each vary for each of the 7 days by county. Hourly distribution of em issions by day of week could also be investigated.

Speciation Changes Over Time Description: Technological shifts can cause the spe ciation profiles to be very different over time. The chemical composition of emissions source s such as architectural coatings and degreasing and printing solvents have changed consi derably as regulations have been adopted. Changes in gasoline composition have been captured well in ARB’s speciation profiles, but other categories have not kept pace.

Seasonal variations of trucks Description: Certain truck activities can vary cons iderably by season. For example, truck use can be high during harvesting time and nearly zero at other times. Most of these trucks are registered, so the emissions are included in the in ventory. There is no temporal variability included in EMFAC for these trucks. They are not w ell characterized spatially since the trucks generally operate on local roads rather than freewa ys.

ITN network for future years Description: The ITN has been developed for the yea r 2000, but not for any future years. Some local COGs/MPOs have transportation networks f or future years that could be used to estimate spatial changes.

Truck Activity Description: In most regions, truck activity is ass umed to be a percentage of light-duty vehicles. Separate truck activity estimation from light-duty vehicle projections.

Off-road categories Description: Some off-road categories are probably not well characterized spatially or temporally. Off-road equipment (especially constru ction equipment) and farm equipment are two possibilities.

Goods Movement (Magnet sites) Description: Emissions related to goods movement, s uch as distribution centers and truck stops are not well characterized. Such concentrate d emissions may impact the modeling

results.

High-emitting vehicles Description: High-emitting vehicles are included in the on-road emission estimates. Little is known about their spatial or temporal distribution and whether they affect modeling results.

### ___________________________________________________ ___________________ A-71 High NOx concentration near Bakersfield Description: Modeling results have shown a large co ncentration of NOx emissions near Bakersfield. Several area source categories have h igh amounts of NOx in the grid cells covering Bakersfield. These categories include: 1) reciprocating internal combustion engines burning gaseous fuels, 2) diesel construction equip ment, 3) locomotives, 4) natural gas combustion in service and commercial and 5) natural gas combustion in manufacturing and industrial. These sources could be investigated to check the appropriateness of the assigned spatial locations and accuracy of emissions.

Wildfires in future years Description: The actual location of wildfires in fu ture years is impossible to predict. However, we know that there will be wildfires in future year s. Methods are being developed to predict the regions most likely to have wildfires. Should such data be included in modeling?

4. Review of Placeholder Episode Emissions There were no questions regarding the review of pla ceholder episode emissions.

5. Status of PM Inventory Development This agenda item was postponed to the next call, wh ere ARB will give a status report of current PM inventory developments.

6. Other Issues

SJV staff mentioned that the CCOS Technical Committ ee is considering a second project. This project would investigate the data and assumptions used to estimate emissions in the future and in the past (forecasting and backcasting). How wel l do we forecast emissions? What kinds of things might have been missed? For example, were t he urban growth in the SJV and Sacramento regions and the completion of UC Merced adequately characterized in the spatial

distributions?

7. Plans for Next Meeting The next meeting is scheduled for Tuesday, August 1 6 at 10:00 am.



## August 16, 2005

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien, Cuong Tran B ay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn Sacrame nto Metro AQMD Gary Arcemont, David Nunes San Joaquin Valley Unifi ed APCD Paul Hensleigh Yolo-Solano AQMD Genie McGaugh Ventura County APCD

Leonard Seitz Caltrans Headquarters

Jim Wilkinson Alpine Geophysics Paul Allen, Michael Benjamin, Vernon Hughes, Larry Hunsaker, Anne Lin, Jeff Lindberg, Cheryl Taylor, B ruce Tuter ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of July 21 Meeting Highlights The meeting highlights were approved as written.

### ___________________________________________________ ___________________ A-72 3. Follow-up to Temporal/Spatial Improvement Resear ch Project At the July 21 meeting, the group discussed possibl e topics to be included in a research project to improve temporal and spatial inputs used for dis aggregating county-level emissions to grid cell, hourly emissions. These ideas were passed al ong to the CCOS Technical Committee (TC) for recommended inclusion in a proposed RFP. A bri ef write-up on the project was distributed to the CCOS TC, asking for their comments by August 15. ARB will be drafting an RFP that will include the suggestions of this group and comments from the TC. ARB thanked all the members for their participation in this group. All of their input during past meetings, as written in the meeting highlights, enabled ARB to easily compi le suggested topics for this project.

4. Status of ITN Version 2 Jim Wilkinson (Alpine Geophysics) gave an update on this project. At the time when this project was due to be completed (4/30/05), there were error s in the ITN. After further investigation, it

was discovered that errors had occurred when extrac ting data from EMFAC. Alpine has now corrected those errors. Additionally, Alpine was a ble to develop a method to conflate the Madera and SCAG networks, so they will be included in version 2 of the ITN after all. Alpine is currently reintegrating all the networks into the I TN. Version 2 of the ITN includes all of the networks that were provided by the regional transpo rtation planning agencies (RTPAs) and the California Department of Transportation (Caltrans) for use in this project.

ARB has asked Alpine to develop reports that could be used to QA the ITN. Alpine has provided ARB two files, using the MTC network as a test case. The first file shows the spatial and temporal distribution of gridded VMT by network . The data represent a weekday in July of

2000. This file can be read into PAVE for convenie nt review. PAVE will generate a separate plot of gridded VMT for each of EMFAC’s 13 vehicle classes for each fuel type (gasoline, diesel and electric) by hour. There are also VMT totals b y vehicle class and fuel type by hour. The second data set is an Excel spreadsheet that shows the VMT for each of the 13 vehicle classes by fuel type by hour. It is the same data as the f irst file without the spatial distribution. ARB wi ll make the files available to the group for all the n etworks once they have received all the files. The group will be asked for feedback on the QA with in two weeks once the files are made

available.

Alpine has made updates to the final draft report t o reflect the corrected errors mentioned above as well as previous comments from group participant s. ARB agreed to redistribute the draft final report (sent in April) to the group for one last op portunity to make comments before the report is

finalized.

As a reminder, the Integrated Transportation Networ k (ITN) is a seamless on-road transportation network that covers all of Californi a. The ITN was developed from about 20 regional travel demand model loaded networks receiv ed from RTPAs as well as the Statewide Model from Caltrans. The ITN, developed for calend ar year 2000, is used to spatially distribute the on-road mobile source emissions generated by EM FAC for use in air quality models.

5. Status of Inventory Development

Stationary Source Development Michael Benjamin (ARB, Emission Inventory) gave an update on developing the stationary and area source inventory for use in modeling. ARB wil l begin the forecasting process in the next week or two. {Note: The schedule has been revised since the meeting. Forecasting will begin in early October.} When forecasting is completed, ARB will develop gridded inventory output using CEFS.

### ___________________________________________________ ___________________ A-73 Several emission categories are currently undergoin g changes. 1) Consumer products have been updated based on a 2001 Stationary Source Divi sion (SSD) survey. 2) Commercial harbor craft have also been updated, reflecting a r ecently adopted SSD ATCM (Air Toxic Control Measure). 3) Ocean-going vessels are in th e process of being updated. See below for

more information.

There are two additional categories that may be upd ated in time for use in the final SIP inventory. ARB is working on an ATCM for in-use st ationary agricultural diesel engines. The inventory will be updated once the regulation is ap proved. Any changes to the inventory

available in time would be handled as an external a djustment. Emissions from railroads may also be revised. The changes would be handled as a n external adjustment to the modeling inventory as well.

Off-Road Mobile Inventory Due to recent staffing changes, the availability of the next version of the OFFROAD model is unknown. {Note: The next version of OFFROAD is sch eduled to be available in November.} Once it is available, the emissions will be placed in CEIDARS and CEFS to develop gridded

inventories.

On-Road Mobile Inventory Due to recent staffing changes, the availability of the next version of the EMFAC model is unknown. {Note: The next version of EMFAC is sched uled to be available in November.} Once available, the emissions will be used to develop a gridded on-road motor modeling inventory.

HDD NOx Weekend Factor Leonard Seitz, Caltrans, has prepared preliminary s ummaries from some of the piezo counter stations by day of week for calendar year 2004. Th ere are 137 sites statewide. Piezo counters

are able to count the number of axles on a vehicle that passes over it; count data are available for 15 vehicle classes. The group agreed to revive the Weigh-In-Motion (WIM) subcommittee and change its name to the Weekend Truck subcommitt ee. The subcommittee will meet on August 22. The group will discuss how the data cou ld be used to improve the factors applied to the weekday travel models to approximate weekend tr avel. Separate factors will be developed for heavy-duty diesel trucks that represent norther n California. The subcommittee will investigate the level that factors could be develop ed (e.g. by route, county, air basin, hour and/or vehicle type).

Ships The districts previously estimated emissions from s hips. ARB has now developed a statewide methodology. ARB has made presentations to the Emi ssion Inventory Technical Advisory Committee (EITAC) and has been working directly wit h the districts to update this category. There will be base and future year emissions change s. Changes to the base year are due primarily to the inclusion of ships out to 100 mile s offshore. NOx emissions statewide have approximately doubled due to the substantially larg er area being inventories. Hotelling and manuevering emissions are also being updated. As p art of the SECA project (Sulfur Emission Control Area), Professor Jim Corbett , University o f Delaware, is developing growth factors. The growth appears to be higher than what is currently used. As mentioned at previous meetings, Professor Bob Bornstein developed day-specific ship ping factors for the July 1999 and July/August 2000 episodes. The group agreed that T och Mangat (BAAQMD), Michael Benjamin (ARB) and Cheryl Taylor (ARB) would investigate the appropriateness of reusing those factors with the new inventory to develop revised day-speci fic emissions for ships.

### ___________________________________________________ ___________________ A-74 Nevada Emissions ARB has been working with Gail Tonnesen (UC Riversi de, CE-CERT) to obtain model-ready

files that include the State of Nevada. The data a re from the Western Regional Air Partnership (WRAP) for 1998. ARB is establishing the procedure to process the data and will provide more information about what types of sources are include d at the next meeting.

Future Year Facilities Sacramento Metro AQMD staff provided information on two facilities (a power plant and a dairy) that will begin operation after 2002 and therefore cannot be included in the 2002 CEIDARS inventory. ARB reported that files containing the data have been created in CEFS format, which is the same format that the point and area source e missions are provided to ARB modelers from ARB emission inventory staff.

Ammonia Ammonia emissions, both base and future years, will be included in the next set of gridded inventories provided to ARB modelers from ARB emiss ion inventory staff. Ammonia will join the usual suite of pollutants: CO, NOx, SOx, TOG and PM

.

Speciation ARB reported that there are no new VOC profiles ava ilable now, although new sources of data are always being sought. ARB staff is reviewing th e speciation profiles for vintage and assignment to identify where better speciation prof iles are needed. ARB plans on using only the SAPRC chemical mechanism and dropping CBIV.

BAAQMD staff asked the ARB which version, 5 or 6, s hould be used to speciate NO for biogenics. One version speciates NO to 100% NO. T he other speciates NO into NO and NO 2

. The BAAQMD will send ARB a note. ARB will investig ate and respond.

Future Year ITN Staff from Alpine Geophysics described the availabi lity of future year networks that were gathered during the preparation of ITN version 2. There is no single future year of local transportation networks available statewide, but 20 10 is the year that the most number of networks have in common. Future year networks are available for about half the networks in

the ITN.

6. Other Issues

No other issues were discussed.

7. Plans for Next Meeting The next meeting is scheduled for Thursday, Septemb er 8 at 10:00 am.

### ___________________________________________________ ___________________ A-75 

## September 8, 2005

Attendees Affiliation
Toch Mangat, Phil Martien Bay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn Sacrame nto Metro AQMD David Garner, David Nunes, Stephen Shaw San Joaquin Valley Unified APCD Susan McLaughlin Yolo-Solano AQMD Genie McGaugh Ventura County APCD

Leonard Seitz Caltrans Headquarters Paul Allen, Vernon Hughes, Larry Hunsaker, Anna Komorniczak, Martin Johnson, Mimi Sogotlugil, Chery l Taylor, Bruce Tuter ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of August 16 Meeting Highlights The meeting highlights were approved as written.

3. Status of ITN (version 2) This item was postponed to the next meeting.

4. Status of Inventory Development Stationary Source Development Martin Johnson (ARB, Emission Inventory) gave an up date on developing the stationary and area source inventory for use in modeling. ARB rec ently met with the inventory staff from the

northern California districts. Since there is a d elay in the release of the next version of EMFAC and OFFROAD, ARB has decided to use the time to all ow point and area source changes to the 2002 inventory. Changes will be accepted until mid -October. Changes in growth and control factors will also be accepted until October 31, alt hough ARB has received all the growth and control information that was expected. ARB will be gin the forecasting process in November. By the end of November, ARB inventory staff hope to re ceive the outputs from EMFAC and OFFROAD to populate CEIDARS and CEFS with the on-ro ad mobile and off-road mobile sources, respectively. When forecasting is comple ted, ARB will develop gridded inventory output using CEFS.

Off-Road Mobile Inventory

The next version of the OFFROAD model is scheduled to be available at the end of October. ARB staff hopes to receive the output from the OFFR OAD model (off-road mobile source emissions) by the end of November to place in CEIDA RS and CEFS. Following the receipt of the off-road emissions, ARB staff can begin develop ing the gridded inventories needed for modeling. Dr. David Chou was recently appointed th e new section manager handling the

OFFROAD model.

On-Road Mobile Inventory

The next version of the EMFAC model is scheduled to be available at the end of October. Once available, the emissions will be used to develop a gridded on-road motor modeling inventory.

HDD NOx Weekend Factor (report from Weekend Truck S ubcommittee) Caltrans staff reported on the Weekend Truck Subcom mittee meeting on August 22. The purpose of the subcommittee is to discuss how data from AVC (Automatic Vehicle Classifier)

### ___________________________________________________ ___________________ A-76 counters could be used to improve the factors appli ed to the weekday travel models to approximate weekend travel. As the next step in de veloping the factors, Caltrans staff prepared bar charts for some of the sites in District 7 (Los Angeles region); the bar charts were distributed to the SIP Gridded Inventory Coordination Group (GI CG). Per the subcommittee’s direction, the site-specific bar charts showed heavy-duty truck vo lumes (two-way) by day of week by hour. Heavy-duty trucks were defined as FHWA classes 7 th rough 14 to approximate heavy-duty diesel trucks. Only counts during the summer of 20 04 were used, specifically the months of June, July and August without July 2-5 to remove un usual traffic patterns around the July 4 th
holiday.

ARB suggested that the subcommittee develop a recom mended approach of exactly how the count data would be used. A draft methodology will be provided to the SIP GICG for comments. The group also suggested that Caltrans staff develo p bar charts for Caltrans Districts 3 and 4 (includes the Bay Area and Sacramento). The group agreed that they would eventually like to see bar charts developed for the entire state. Dis trict 7 was chosen for analysis so that a comparison could be made to the factors developed p reviously by ARB from southern California

WIM stations.

When working with the AVC data, the group asked if Caltrans staff could develop bar charts for FHWA vehicle classes 1 through 6. Ultimately a set of factors would be developed for FHWA classes 7 – 14 representing heavy-duty diesel truck s and another set of factors that would be applied to all remaining vehicles.

BAAQMD staff mentioned that they had received the W IM data used by Rob Harley in his recent paper. The data will be distributed to the SIP GIC G.

Future Year ITN ARB reported that modeling staff is hoping to devel op the ITN for two future years (2010 and 2020) in-house. ARB staff will be working with Alp ine Geophysics, developer of the ITN, to learn the process. There are still funds available in a current CCOS contract with Alpine Geophysics for inventory development support. If t ime to develop the future year networks inhouse runs short, it may be possible to ask Alpine Geophysics to finish the networks.

Ships ARB’s Emission Inventory staff is working to comple te the revised inventory for ships. ARB and BAAQMD staffs will be working to apply day-specific shipping factors to the revised inventory. Professor Bob Bornstein developed these factors for the July 1999 and July/August 2000 episodes.

Nevada Emissions ARB has been working with Gail Tonnesen (UC Riversi de, CE-CERT) to obtain model-ready

files that include the State of Nevada. The data a re from the Western Regional Air Partnership (WRAP) for 1998. ARB is making progress on setting up the procedure to process the data. The WRAP data include all components of the invento ry: stationary, area-wide, mobile and

natural sources.

Tanks ARB explored with the group whether they would be i nterested in developing day-specific inventories for petroleum storage tanks. EPA has r ecently released a new version of the TANKS program. TANKS estimates emissions on a tank by tank basis and requires detailed information about each tank. Day-specific meteorol ogical data could be used to estimate

### ___________________________________________________ ___________________ A-77 emissions rather than the annual average data used to estimate the emissions that are put into CEIDARS and then used for modeling. It would be a time-consuming process for the districts, yet the emissions from tanks are not that large. R OG emissions from tanks in the Bay Area are less than 4 tons/day and only 20 tons/year in Sacra mento. For tanks containing heavy crude, the emissions would not change much due to the low reactivity. Many tanks vent to control equipment, so the emissions from those tanks would be unaffected. After considerable discussion, the group decided that it would probabl y not be worth the effort that would be required. SJVUAPCD staff will investigate the ques tion further.

Future Year Facilities ARB has developed the emission files for two facili ties that began operation after 2002 as provided by Sacramento Metro AQMD staff. SJVUAPCD staff asked if emission estimates have been made to include the impact of the opening of U C Merced. It was suggested that UC Davis could be used as a surrogate, but no specific metho d of how that would be accomplished was given.

Ammonia No new information was reported.

Speciation No new information was reported.

5. Other Issues

No other issues were discussed.

6. Plans for Next Meeting The next meeting is scheduled for Tuesday, Septembe r 27 at 10:00 am.


## September 27, 2005

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien, Cuong Tran B ay Area AQMD

Hao Quinn Sacramento Metro AQMD Gary Arcemont, David Nunes, Elena Nuno, Stephen Sha w San Joaquin Valley Unified APCD Susan McLaughlin Yolo-Solano AQMD Genie McGaugh Ventura County APCD

Harold Brazil MTC

Leonard Seitz Caltrans Headquarters

Jim Wilkinson Alpine Geophysics Paul Allen, Vernon Hughes, Larry Hunsaker, Anne Lin , Jeff Lindberg, Mimi Sogotlugil, Cheryl Taylor, Doug Thom pson, Bruce Tuter ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of September 8 Meeting Highlights The meeting highlights were approved as written.

3. Action Items Write-up by Weekend Truck Subcommittee

### ___________________________________________________ ___________________ A-78 The group discussed the write-up from the Weekend T ruck Subcommittee about the proposed method to develop day-of-week adjustment factors. The group made three suggestions: 1) the addition of an example to the write-up; 2) apply th e factors developed from the Automatic Vehicle Counters by county to the gravity model (us ed to estimate commercial VMT in the ITN); and 3) adjust heavy-duty traffic volumes within a t ime period based on the hourly traffic counts. The Subcommittee agreed to meet on October 13 to di scuss these ideas further.

Caltrans staff is preparing bar charts for some of the sites in District 10 (Northern SJV and Mountain Counties) and will be working on Districts 3 and 4.

Follow-up to Area Source Emissions Issue ARB’s Emission Inventory staff will be investigatin g the error recently discovered in a district area source category. To aid in the investigation, Larry Hunsaker (ARB) agreed to produce a report comparing emissions by year. See item 6 for more information.

4. Status of ITN (version 2) Jim Wilkinson, Alpine Geophysics, gave the status o n the preparation of the ITN and the final
report. Alpine is converting the ITN to work completely in ArcAML. The last version of the ITN included processing in ArcAML, SAS and Fortran. Wh en the processing is completed, Alpine will join the networks. Alpine hopes to provide ARB the ITN and final report this week.

ARB asked how facility type is standardized in the ITN. Alpine responded that facility type is

standardized to the federal standard of 1 – 9 and i s maintained on the ITN.

Previously, ARB had asked Alpine to develop reports that could be used to QA the ITN. Alpine provided two types of files. The first file shows the spatial and temporal distribution of gridded VMT by network. The data represent a weekday in Ju ly of 2000. This file can be read into PAVE for convenient review. PAVE will generate a s eparate plot of gridded VMT for each of EMFAC’s 13 vehicle classes for each fuel type (gaso line, diesel and electric) by hour. There are also VMT totals by vehicle class and fuel type by hour. The second data set provided was an Excel spreadsheet that shows the VMT for each of the 13 vehicle classes by fuel type by

hour. It is the same data as the first file withou t the spatial distribution. ARB made the files available to the group for all the networks on Sept ember 13. The group was asked for feedback on the QA by September 27. ARB had not received an y comments yet. BAAQMD and SJVUAPCD staff agreed to look at the QA files this week. ARB will compile all comments for further investigation.

5. Status of Inventory Development

Stationary Source Development ARB gave an update on developing the stationary and area source inventory for use in modeling. ARB staff is performing quality assuranc e on the 2002 inventory. ARB will begin the forecasting process in November. By the end of Nove mber, ARB inventory staff hope to receive the outputs from EMFAC and OFFROAD to populate CEID ARS and CEFS with the on-road mobile and off-road mobile sources, respectively. When forecasting is completed, ARB Emission Inventory staff will develop gridded inven tory output using CEFS near the end of 2005.

Off-Road Mobile Inventory As mentioned previously, the next version of the OF FROAD model is tentatively scheduled to

be available at the end of October for internal ARB use. ARB staff hopes to receive the output

### ___________________________________________________ ___________________ A-79 from the OFFROAD model (off-road mobile source emis sions) by the end of November to place

in CEIDARS and CEFS.

On-Road Mobile Inventory The next version of the EMFAC model is tentatively scheduled to be available at the end of October for internal ARB use. Once available, the emissions will be used to develop a gridded on-road motor modeling inventory.

HDD NOx Weekend Factor (report from Weekend Truck S ubcommittee)

See item 3 above.

Future Year ITN ARB reported that modeling staff would soon begin t o develop the ITN for two future years (2010 and 2020) in-house. ARB staff will be workin g with Alpine Geophysics, developer of the ITN, to learn the process.

Ships ARB reported that once the revised emissions for sh ips are updated in CEIDARS, ARB would work with BAAQMD to apply the day-specific shipping factors. Professor Bob Bornstein developed these factors for the July 1999 and July/ August 2000 episodes.

Nevada Emissions ARB is making progress on setting up the procedure to process the model-ready files obtained from Gail Tonnesen (UC Riverside, CE-CERT) to add t he WRAP data for the State of Nevada.

Tanks At the previous meeting the group explored the poss ibility of developing day-specific inventories for petroleum storage tanks. The group decided tha t the impact on emissions would be relatively small and that resources would not be av ailable to make the necessary calculations. This topic will be dropped from the agenda in futur e meetings.

Future Year Facilities No new information was reported. District staff wa s reminded that emissions from facilities that begin operation after the base year inventory (2002 ) could still be included in the modeling. Please provide the appropriate information to ARB.

Ammonia No new information was reported. As mentioned prev iously, ammonia emissions will be generated along with the criteria emissions in the next round of gridding.

Speciation ARB recently added new speciation profiles for cons umer products and architectural coatings to its database. ARB staffs are reviewing the speciat ion database to ensure that the most appropriate profile is assigned to each emission ca tegory (SCC) and that the latest available profiles are used.

6. Other Issues ARB and SJVUAPCD staffs recently uncovered an error in the area source emissions in Kern County. Upon investigating concerns by modelers th at NOx emissions appear to be too high in the Bakersfield area, staffs noticed that the emiss ions from natural gas combustion in service and commercial were significantly higher than what was originally estimated by the district. The

### ___________________________________________________ ___________________ A-80 reconciled emissions in 1990 and 1991 were near 400 tpy, yet in 1993 the emissions jumped to almost 6,000 tpy. One of the QA reports available in CEIDARS is a reconciliation report that displays which point sources get reconciled with wh ich area source category. The 1990 reconciliation report showed that several cogenerat ion turbines with very large NOx emissions were incorrectly being reconciled with this categor y. Although the SIC/SCC assignments for these cogeneration turbines were later corrected to be reconciled with cogeneration, the total area source emissions (called the “unreconciled emi ssions”) were never reduced to remove the incorrect emissions. These large unreconciled emis sions have been grown in CEIDARS to the present. SJVUAPCD staff suggested that this topic b e raised at EITAC since this problem may have occurred for other categories and other distri cts. ARB offered to develop a report showing the percent change of emissions by year for each ar ea source category to help identify large changes that may indicate a need for further invest igation.

7. Plans for Next Meeting The next meeting is scheduled for Tuesday, October 25 at 1:30 pm.



## October 30, 2005

Attendees Affiliation
Amir Fanai, Toch Mangat Bay Area AQMD Bruce Katayama, Hao Quinn Sacramento Metro AQMD Gary Arcemont, David Garner, David Nunes, Stephen Shaw, Patrick Wenzinger San Joaquin Valley Unified APCD

Susan McLaughlin Yolo-Solano AQMD

Harold Brazil MTC

Jim Wilkinson Alpine Geophysics Vernon Hughes, Larry Hunsaker, Martin Johnson, Anne Lin, Cheryl Taylor ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of September 27 Meeting Highlights The meeting highlights were approved as written.

3. Action Items Report from Weekend Truck Subcommittee

The Weekend Truck Subcommittee met on October 13. Previously, the SIP Gridded Inventory Coordination Group (GICG) had made three suggestion s.

 Addition of an example to the write-up The Subcommittee agreed that an example should be a dded, but the methodology has not been refined enough to include an example at this t ime.

 Apply the factors developed from the Automatic Veh icle Counters (AVC) by county to the gravity model (used to estimate comme rcial VMT in the ITN) The Subcommittee agreed to take the assigned volume s from the gravity model in the ITN and adjust the volumes with the hourly ratios devel oped from the count data by county. The main item that the Subcommittee is debating is whet her the ratios should be assigned to all facility (i.e. road) types or just to state highway s since the AVC data are only on state highways. The term state highways includes interst ates as well. Subcommittee members

### ___________________________________________________ ___________________ A-81 are looking for data from other sources, especially those on non-highways. Mike Bitner (Fresno COG) has provided traffic counts from Fresn o County; the data are hourly counts by day that have been classified into the 15 FHWA vehi cle classification scheme. ARB is processing the data. The Subcommittee is also cons idering sorting highways into urban and rural to see if rural highways could be used as a s urrogate for non-state highways.

 Adjust heavy-duty traffic volumes within a time pe riod based on the hourly traffic

counts The Subcommittee agreed to adjust volumes within a time period using ratios from the traffic counts. The COGs usually report data by time perio d (e.g. am peak) that covers a few hours. The totals for each time period would remai n unchanged, but the volumes within a time period would be adjusted.

The Subcommittee plans to meet the week of November 7 to further refine the methodology to adjust weekday/weekend emissions.

Status of Area Source Error Investigation ARB’s Emission Inventory staff is investigating th e error discovered in a district area source category. To aid in the investigation, Larry Hunsa ker (ARB) produced two reports that compare emissions by region and category for the av ailable CEIDARS databases from 1987 through 2003. The first report displays emissions for the entire category, including both point and area sources. The second report displays just the reconciled area source portion of the category. The second report clearly shows t he error that was detected in Kern County when comparing the 1991 to 1993 emission cha nges. Item 6 of the September 27, 2005 minutes provides detailed information on the e rror. The group asked ARB to post these spreadsheets.

4. Status of ITN (version 2) Jim Wilkinson, Alpine Geophysics (AG), gave the sta tus on the preparation of the ITN and the final report. AG has posted the link-based network that contains 98% of the VMT. The TAZbased portion of the ITN, which contains the remain ing 2% of the VMT and the trip distribution, is being corrected and will be available soon. The link-based file is a zipped ARC export file. AG is hoping to provide the TAZ-based data by Frida y with the final report following shortly. After the group is notified that the TAZ-based file is available, ARB asked to receive comments within 2 weeks. A call will be set up if there are any major concerns to discuss.

Previously, AG developed reports that could be used to QA the ITN. One set of reports showed the spatial and temporal distribution of gridded VM T by network using PAVE. The second set of reports was an Excel spreadsheet that showed the VM T for each of the 13 vehicle classes by fuel type by hour.

ARB received preliminary feedback from BAAQMD and S JVUAPCD staff. BAAQMD staff made a map comparing gridded VMT for versions 1 and 2 of the ITN and included major roadways per TIGER data. Although there are a few locations whe re the roadways and gridded emissions don’t match, overall version 2 has done a better jo b of matching roadways to emissions. SJVUAPCD staff provided four comments. Two comment s relate to information supplied by EMFAC. Another comment asked why electric vehicles are in the ITN even though there are no emissions. AG responded that electric vehicles are carried in the ITN since they were supplied by EMFAC. The fourth comment mentioned that in the PAVE file containing the entire ITN, the counties with no local transportation networks show ed no VMT at all. Those counties should contain VMT from the statewide (Caltrans) network. AG reviewed the file during the call and agreed that the data were indeed missing. AG will revise the QA file for the entire ITN and

### ___________________________________________________ ___________________ A-82 make it available to the group. All of the comment s received to date have been compiled for further investigation and posted on ARB’s Orthus ft p site.

5. Status of Inventory Development Stationary Source Development ARB gave an update on developing the stationary and area source inventory for use in modeling. ARB staff is performing quality assuranc e on the 2002 inventory. ARB is still on schedule to begin the forecasting process in Novemb er. By the end of November, ARB inventory staff hope to receive the outputs from EM FAC and OFFROAD to populate CEIDARS

and CEFS with the on-road mobile and off-road mobil e sources, respectively. When forecasting is completed, ARB Emission Inventory st aff will develop gridded inventory output for the CCOS domain using CEFS near the end of 2005. P lanning inventories are planned to be available in February 2006.

Off-Road Mobile Inventory

The next version of the OFFROAD model is tentativel y scheduled to be available mid-November for internal ARB use, including QA of the data. AR B staff hopes to receive the output from the OFFROAD model (off-road mobile source emissions) by the end of November to place in

CEIDARS and CEFS.

On-Road Mobile Inventory The next version of the EMFAC model is tentatively scheduled to be available mid-November for internal ARB use, including QA of the data. On ce available, the emissions will be used to develop a gridded on-road motor vehicle modeling in ventory.

Future Year ITN ARB reported that modeling staff would begin learni ng the process to develop the ITN for two future years (2010 and 2020) when the ITN version 2 is received.

Ships ARB reported that once the revised emissions for sh ips are updated in CEIDARS, ARB would work with BAAQMD to apply the day-specific shipping factors. Professor Bob Bornstein developed these factors for the July 1999 and July/ August 2000 episodes.

Nevada Emissions ARB has received the model-ready files from Gail To nnesen (UC Riverside, CE-CERT) developed for the WRAP covering the State of Nevada . There have been two difficulties in using the WRAP data. First, the WRAP data used 12 km grid cells, so the emissions must be converted to the CCOS 4 km grid. Second, files wer e developed using CB-IV, but the modeling for CCOS is being run with SAPRC-99 chemistry. ARB described two options to handle this problem. One possibility is to use SMOKE. However ARB modeling staffs aren’t familiar with its use and won’t likely have the time to learn it. Another option is to map back to SAPRC-99 from CB-IV. This will probably be the option that ARB will take. Although it may introduce some small inaccuracies in the inventory, ARB believes t hat Nevada emissions have little impact on modeling results in the San Joaquin Valley, Bay Are a or Sacramento regions. ARB staff is pursuing another option of obtaining gridded, but n ot yet speciated, files from UCR.

Future Year Facilities No new information was reported. District staff wa s reminded that emissions from facilities that begin operation after the base year inventory (2002 ) could still be included in the modeling.

### ___________________________________________________ ___________________ A-83 Ammonia

The ammonia emissions from livestock waste have bee n updated using new higher emission factors that were developed from recent studies. A dditionally, the ammonia inventory that was provided to SJVUAPCD staff for their PM 2.5 SIP was underestimated because some of the new categories developed for ammonia (e.g. diapers) wer e inadvertently left out. ARB will work with district staff to provide a revised ammonia invento ry in about a week. As mentioned previously, ammonia emissions will be generated along with the criteria emissions in the next round of gridding.

Speciation ARB staffs are continuing to review the speciation database to ensure that the most appropriate profile is assigned to each emission category (SCC) and that the latest available profiles are

used.

6. Other Issues

No other issues were discussed.

7. Plans for Next Meeting The next meeting is scheduled for Wednesday, Novemb er 30 at 1:30 pm.



## November 30, 2005

Attendees Affiliation
Amir Fanai, Toch Mangat Bay Area AQMD Charles Anderson, Bruce Katayama, Hao Quinn Sacrame nto Metro AQMD Gary Arcemont, Brant Botill, Jessi Hafer, Britton H uggins, Elena Nuno, Stephen Shaw San Joaquin Valley Unified APCD

Genie McGaugh Ventura County APCD

Harold Brazil MTC

Leonard Seitz Caltrans Headquarters

Jim Wilkinson Alpine Geophysics Paul Allen, Vernon Hughes, Larry Hunsaker, Martin Johnson, Cheryl Taylor, Doug Thompson, Bruce Tuter ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of October 30 Meeting Highlights The meeting highlights were approved as written.

3. Action Items Report from Weekend Truck Subcommittee

The Weekend Truck Subcommittee met on November 15. Leonard Seitz reported that he is compiling AVC data for District 4 (Bay Area). ARB mentioned that the subcommittee is working to refine the methodology. One suggestion is to ap ply the hourly adjustment factors by county, EMFAC vehicle class, month and day. The factors wo uld be applied to the ITN before running through DTIM. Since the count data (AVC) are sorte d into FHWA vehicle class, a mapping is

needed between FHWA and EMFAC vehicle classes. Unf ortunately, this mapping is not straightforward; the subcommittee will work to reso lve this issue.

### ___________________________________________________ ___________________ A-84 The subcommittee is making headway on developing a methodology. Some members of the subcommittee have expressed concern that a complete methodology may not be developed in time to be used in modeling inventories that will b e used in the SIPs. As a backup plan, BAAQMD staff proposed a simplified methodology that could be used to improve the current methods in case the subcommittee is unable to fully develop a new method and the data to support it in time. The subcommittee plans to disc uss the backup plan, along with many other issues, at its upcoming meeting on December 8.

Status of Area Source Error Investigation ARB’s Emission Inventory staff is correcting the er ror discovered in a district area source category. The correction has already been made to the 2002 database; database years 1993 through 2001 will be corrected soon.

Previously, Larry Hunsaker (ARB) produced two repor ts that compare emissions by region and category for the available CEIDARS databases from 1 987 through 2003. The first report displays emissions for the entire category, includi ng both point and area sources. The second report displays just the reconciled area source por tion of the category. ARB posted these spreadsheets to ARB’s Orthus ftp site. Larry has s ince produced an additional QA report, similar to the two previous QA reports, that displa ys only point source emissions by category (EICSUM). ARB will also post these spreadsheets to Orthus.

4. Status of ITN (version 2) Jim Wilkinson, Alpine Geophysics (AG), gave the sta tus on the preparation of the ITN and the final report. AG is packaging all the files that make up the enti re ITN version 2. He plans to post the files today or tomorrow with the final rep ort following shortly. ARB will notify the group when the ITN v2 and final report are available.

Previously, AG developed reports that could be used to QA the ITN. One set of reports showed the spatial and temporal distribution of gridded VM T by network using PAVE. The second set of reports was an Excel spreadsheet that showed the VM T for each of the 13 vehicle classes by fuel type by hour.

As requested at the October 30 call, AG revised the QA file for the entire ITN; it was made available to the group on November 1. ARB has recei ved no new comments on the QA reports. All of the comments received to date have been comp iled for further investigation and posted on ARB’s Orthus ftp site. AG will review the comments

.

5. Status of Inventory Development

Stationary Source Development ARB gave an update on developing the stationary and area source inventory for use in modeling. ARB staffs are wrapping up quality assur ance of the 2002 inventory. As part of the QA, ARB staffs have been comparing emissions in the 2002 database with earlier projections of the year 2002. ARB plans to begin the forecasting process in early December. By December 16, ARB inventory staff hope to receive the outputs from OFFROAD to populate CEIDARS and

CEFS with the off-road mobile sources. When forec asting is completed, ARB Emission Inventory staff will develop gridded inventory outp ut for the CCOS domain using CEFS. ARB modeling staffs are scheduled to receive the CEFS o utput by the end of December.

### ___________________________________________________ ___________________ A-85 Off-Road Mobile Inventory

The next version of the OFFROAD model is tentativel y scheduled to be available mid-December for internal ARB use, including QA of the data. AR B staff hopes to receive the output from the OFFROAD model (off-road mobile source emissions) by December 16 to place in CEIDARS

and CEFS.

On-Road Mobile Inventory ARB Inventory staff are scheduled to receive a snap shot from the next version of EMFAC in mid-December for internal ARB use, including QA of the data. Once available, the emissions will be used to develop a gridded on-road motor veh icle modeling inventory. Review of EMFAC

will continue into 2006. The next version of EMFAC is planned for release when the SIPs are completed. ARB will likely receive new activity da ta from the COGs this spring.

Future Year ITN ARB reported that modeling staff plans to begin dev eloping the ITN for two future years (2010 and 2020) when the ITN version 2 is received.

Ships ARB will be working with BAAQMD to apply the day-sp ecific shipping factors developed by Professor Bob Bornstein for the July 1999 and July/ August 2000 episodes.

Nevada Emissions ARB has received the model-ready files from Gail To nnesen (UC Riverside, CE-CERT) developed for the WRAP covering the State of Nevada . There have been two difficulties in using the WRAP data. First, the WRAP data used 12 km grid cells, so the emissions must be converted to the CCOS 4 km grid. Second, files wer e developed using CB-IV, but the modeling for CCOS is being run with SAPRC-99 chemistry. ARB plans to map from CB-IV to SAPRC-99. Although it may introduce some small inaccuracies i n the inventory, ARB believes that Nevada emissions have little impact on modeling results in the San Joaquin Valley, Bay Area or Sacramento regions. ARB staff is trying to obtain gridded, but not yet speciated, files from

UCR.

Future Year Facilities No new information was reported. District staff wa s reminded that emissions from facilities that begin operation after the base year inventory (2002 ) could still be included in the modeling.

Ammonia ARB mentioned at the last meeting that the ammonia inventory that was provided to

SJVUAPCD staff for their PM 2.5 SIP was underestimated because some of the new cate gories developed for ammonia (e.g. diapers) were inadverte ntly left out. ARB provided a revised ammonia inventory to the district. ARB inventory s taff are now able to forecast ammonia

emissions from on-road motor vehicles since ammonia emissions will not be handled within EMFAC at this time. As mentioned previously, ammon ia emissions will be generated along with the criteria emissions in the gridded CEFS output t hat will be developed soon for point and area

sources.

Organic Speciation ARB staffs are continuing to review the speciation database to ensure that the most appropriate profile is assigned to each emission category (SCC) and that the latest available profiles are

used.

### ___________________________________________________ ___________________ A-86 PM Speciation/Size Cuts ARB has received some funds for improving PM specia tion and size cut data. ARB is prioritizing which data need the most improvement.

6. Other Issues Genie asked how Moyer reductions would be handled i n the modeling inventories. Martin responded that they would be handled as external ad justments. Each district would decide how Moyer reductions would be applied and to which emis sion categories (EICs).

7. Plans for Next Meeting The next meeting is scheduled for Tuesday, January 10 at 1:30 pm.



## January 10, 2006

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien Bay Area AQMD Bruce Katayama, Hao Quinn Sacramento Metro AQMD Gary Arcemont, David Garner, David Nunes, Stephen

Shaw San Joaquin Valley Unified APCD

Genie McGaugh Ventura County APCD Susan McLaughlin Yolo-Solano AQMD

Jim Wilkinson Alpine Geophysics Paul Allen, Martin Johnson, Anne Lin, Mimi Sogotlug il, Cheryl Taylor, Bruce Tuter ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of November 30 Meeting Highlights The meeting highlights were approved as written.

3. Action Items Report from Weekend Truck Subcommittee

The Weekend Truck Subcommittee met on January 5. L eonard Seitz has compiled AVC (count) data for District 4 (Bay Area). The subcom mittee is working to refine the methodology. Factors are being developed to reapportion the dail y truck volumes to new diurnal patterns based on the count data. These factors would be ap plied to the ITN before running through DTIM. Since the count data (AVC) are sorted into F HwA vehicle class, a mapping is needed between FHwA and EMFAC vehicle classes. Although t he mapping is not straight forward, the subcommittee is considering the following approxima tion: 1) count data from FHwA classes 7 and 8 would be used to distribute light heavy-duty trucks and medium heavy-duty trucks and 2) count data from FHWA classes 9 through 14 would be used to distribute heavy heavy-duty trucks. Separate factors would be developed for th e midweek days (Tuesday, Wednesday and Thursday combined) and individually for Friday, Sat urday, Sunday and Monday. Count data from June 1 through August 31, 2004 (excluding July 2-5) will be used to develop the factors. Additionally, the subcommittee is developing a seco nd set of factors to scale the volumes of passenger cars and trucks for a Friday, Saturday, S unday and Monday compared to the average of Tuesday, Wednesday and Thursday (Tuesday , Wednesday and Thursday will remain unchanged).

### ___________________________________________________ ___________________ A-87 The subcommittee is making headway on developing a methodology. Some members of the subcommittee have expressed concern that a complete methodology may not be developed in time to be used in modeling inventories that will b e used in the SIPs. As a backup plan, BAAQMD staff proposed a simplified methodology that could be used to improve the current methods in case the subcommittee is unable to fully develop a new method and the data to support it in time. The subcommittee approved the backup plan.

4. Status of ITN (version 2) Jim Wilkinson, Alpine Geophysics (AG), gave the sta tus on the preparation of the ITN and the final report. In mid-December, AG provided to ARB the final report and all the fil es that made up the entire ITN version 2. Jim plans to visit ARB s oon to meet with ARB staff and answer questions on the creation of the ITN version 2.

ARB asked Jim to prepare DTIM-ready files. ARB sta ff is working to get DTIM running using the

ITN version 2.



### 5. Status of Inventory Development

Stationary Source Development ARB inventory staff described the development of em ission projections for all years from 1990 through 2030 using the 2002 CEIDARS base year inven tory. ARB staff explained that area and point sources were handled differently for years be fore the inventory base year. Emissions from area sources were projected both forward (2003 thro ugh 2030) and backwards (1990 through 2001) from the 2002 base year using the growth and control information in CEFS (ARB’s forecasting system). Emissions from point sources for the years 2003 through 2030 were also forecast from the 2002 base year using the growth a nd control information in CEFS. However, emissions from point sources in earlier years (1990 through 2001) used historical point source information (e.g. the point source emissions for 20 00 came from the 2000 CEIDARS base year inventory).

ARB inventory staff provided gridded outputs from C EFS to ARB modeling staff at the end of December 2005. The CEFS outputs included a weekday and a weekend day for all twelve months for every year from 1990 through 2030. Due to the variety of years and modeling needs for the upcoming ozone and PM SIPs along with input s required for CCOS contracts, ARB inventory staff developed new routines to be able t o provide many more inventories than have ever been requested previously. [Great job!!!]

Data from the latest version of the OFFROAD model w as used in the inventory provided in December. This inventory was complete for 2002 thr ough 2030 as well as for the year 2000. The historical point source information was not inc luded for 1990 through 1999 plus 2001 to allow ARB inventory staff time to correct the UTM c oordinates in these years to be consistent with the 2002 inventory. A few consumer products c ategories were inadvertently left out. A revised inventory will be provided to ARB modeling staff when the corrections are completed. ARB modeling staffs are hoping to have CAMx model-r eady files ready by mid-February. This would include a base year inventory for the August 1997 episode in southern California and the July/August 2000 episode for northern California.

ARB inventory staffs are preparing an “Ozone SIP” w eb site to allow viewing of the gridded inventories generated by CEFS. Planning inventorie s are also being developed. ARB will notify

the SIP GICG when data from these inventories avail able for viewing.

### ___________________________________________________ ___________________ A-88 Off-Road Mobile Inventory ARB inventory staff received output from the latest version of the OFFROAD model in midDecember. The data were placed in CEIDARS and CEFS and were included in the gridded CEFS outputs provided at the end of December. ARB staffs are continuing QA of the data.

On-Road Mobile Inventory ARB modeling staff received a snapshot of the preli minary working version of the new EMFAC model to prepare preliminary draft gridded on-road motor vehicle emission inventories for preliminary modeling. Review of EMFAC will continu e into 2006. This next version of EMFAC is planned for release when the SIPs are completed. ARB may receive new activity data from

the COGs this summer.

Future Year ITN ARB modeling staff is beginning to learn the proces s to develop the ITN version 2. ARB staff plans to create an ITN for two future years, 2010 a nd 2020, using the latest available data from

the COGs.

Ships ARB will be applying the day-specific shipping fact ors developed by Professor Bob Bornstein for the Bay Area for the July 1999 and July/August 2000 episodes to the new inventories.

Nevada Emissions ARB has received the model-ready files from Gail To nnesen (UC Riverside, CE-CERT) developed for the WRAP covering the State of Nevada . There have been two difficulties in using the WRAP data. First, the WRAP data used 12 km grid cells, so the emissions needed to be converted to the CCOS 4 km grid, which ARB has n ow done. Second, files were developed using CB-IV chemistry rather than the SAPRC-99 chem istry used for CCOS modeling. ARB plans to map from CB-IV to SAPRC-99. Although it m ay introduce some small inaccuracies in the inventory, ARB believes that Nevada emissions h ave little impact on modeling results in the San Joaquin Valley, Bay Area or Sacramento regions.

Future Year Facilities No new information was reported for CCOS. District staff was reminded that emissions from facilities that begin operation after the base year inventory (2002) could still be included in the modeling. Ventura County APCD staff has provided d ata for a new offshore Liquefied Natural Gas facility to ARB for the southern California mod eling. The LNG facility is expected to begin operation in 2011.

Ammonia Ammonia emissions were generated along with the cri teria emissions in the gridded CEFS output that was provided for point and area files f or modeling. Ammonia will now be a standard pollutant that is generated for all gridded CEFS fi les.

Organic Speciation ARB staffs are continuing to review the speciation database to ensure that the most appropriate profile is assigned to each emission category (SCC) and that the latest available profiles are used. Sac Metro AQMD staff asked several questions about the changes in composition of

some solvents to use more acetone and whether those changes have been reflected in ARB’s speciation profiles. ARB staff will follow up to a nswer the questions.

### ___________________________________________________ ___________________ A-89 PM Speciation/Size Cuts ARB staffs have peer reviewed about 10 new PM profi les and they have been added to ARB’s

database.

6. Other Issues

No other issues were discussed.

7. Plans for Next Meeting The next meeting is scheduled for February 9 at 10: 00 am.



## April 6, 2006

Attendees Affiliation
Amir Fanai, Toch Mangat, Phil Martien Bay Area AQMD Bruce Katayama, Hao Quinn Sacramento Metro AQMD Gary Arcemont, David Nunes, Leland Villalvazo San J oaquin Valley Unified APCD Alan Ballard, Genie McGaugh Ventura County APCD

Rene Toledo Yolo-Solano AQMD

Harold Brazil MTC

Leonard Seitz Caltrans Headquarters

Jim Wilkinson Alpine Geophysics Chris Emery Environ Paul Allen, Vernon Hughes, Martin Johnson, Linying Li, Anne Lin, Jeff Lindberg, Klaus Scott, Mimi Sogotlug il, Cheryl Taylor, Eugene Yang ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made.

2. Approval of January 10 Meeting Highlights The meeting highlights were approved as written.

3. Gridded Inventory Components Biogenics

Klaus Scott summarized the updates to the gridded b iogenic emissions used for modeling as described in a document previously sent to the SIP GICG members. Several improvements have been made to ARB’s BEIGIS model. First, BEIGI S now operates in a standard statewide modeling domain rather than the separate domains fo r CCOS and SCOS previously maintained. Using a single domain for the state makes it possib le to gain efficiencies in generating biogenic emissions for modeling. A second improvement is th e expansion of the geographic extent of the representation of croplands in the state. More data have become available from the Department of Water Resources (DWR). Additionally, agricultural land use data from GAP and SCAG were combined with County Crop Report data to provide crop coverage for 56 of 58 counties. Only San Francisco and Inyo Counties are not included. A third improvement relates

to the use of a new set of satellite data for the L eaf Area Index (LAI). LAI is used to scale inputs from leaf level to landscape scale for natural area s and croplands. Eight-day average 1 km 2
data generated by MODIS satellites are used in plac e of monthly average LAI derived from 1

km 2 AVHRR satellite data. A fourth improvement relate s to the handling of Other VOCs (OVOCs). Previously, OVOCs were scaled to 30% of t he sum of isoprene, monoterpene and methylbutenol emissions at each grid cell during po st-processing. OVOCs are a category of biogenic VOC that include oxygenated compounds of r elatively low reactivity. An expert in the

### ___________________________________________________ ___________________ A-90 field now recommends that OVOCs be modeling using o nly a (monoterpene) temperature response algorithm and a global default emission fa ctor. This recommendation has now been incorporated into BEIGIS.

Biogenic VOC (BVOC) emissions were modeled for the July/August 2000 episode using the improvements described above. Although individual species increased by a factor between 1.5 and 2, the overall BVOC emissions were on average 1 .7 times greater than total BVOC emissions modeled with prior inputs. The differenc e is mainly due to the change in LAI data. Modeled emissions compared well with flux measureme nts of MBO and monoterpene emissions taken at Blodgett Experimental Forest.

Stationary and Off-Road Mobile Sources ARB inventory staff provided gridded outputs from C EFS to ARB modeling staff at the end of December 2005. The CEFS outputs included a weekday and a weekend day for all twelve months for every year from 1990 through 2030, based on the 2002 CEIDARS database. Inventory staff are now rolling in a few minor chan ges to the 2002 inventory. Additionally,

corrected UTM coordinates are now included in the h istorical point source information for 1990 through 2001. These corrections were made to stand ardize location data to be consistent with the 2002 inventory due to reporting of location dat a in various coordinate systems.

ARB inventory staff is scheduled to receive data f rom a new version of the OFFROAD model in mid-April. The OFFROAD model has been revised due to recent goods movement work by ARB staff. Previously, data from the OFFROAD model were summed and reported to CEIDARS in 80 emissions categories. Beginning with this next version, the emissions will be reported in 1,800 categories, reflecting the level of detail that is carried in the OFFROAD model. ARB inventory staff plan to provide a revised inven tory in early May. After the revised inventory is received, ARB modeling staffs will be processing the data into CAMx model-ready files. The first model-ready files would likely include a base and future year inventory for the August 1997 episode in southern California and the July/August 2000 episode for northern California.

ARB inventory staffs are preparing an “Ozone SIP” w eb site to allow viewing of the gridded inventories generated by CEFS. This web site will be available to district staffs. ARB inventory staffs will notify districts when the web site is r eady.

On-Road Mobile Sources Previously, ARB modeling staff received a snapshot of the preliminary working version of the new EMFAC model in order to prepare preliminary dra ft gridded on-road motor vehicle emission

inventories. Since results from the new EMFAC are still preliminary, output files cannot yet be shared due to conformity issues. The next version of EMFAC is planned for release in

November 2006.

Through a CCOS contract, Jim Wilkinson of Alpine Ge ophysics (AG) is preparing input files for DTIM that use version 2 of the Integrated Transport ation Network (ITNv2.0). The Direct Travel Impact Model (DTIM) is used to grid on-road motor v ehicle emissions. AG and ARB modeling staffs have been working to get DTIM running. ARB modeling staffs hope to have DTIM running within a week. In the next couple of weeks, ARB mo deling staffs plan to develop model-ready files and summary reports for on-road motor vehicle s.

### ___________________________________________________ ___________________ A-91 Temporal Adjustments (Weekend Truck Subcommittee) Cheryl summarized the methodology proposed by the W eekend Truck Subcommittee to improve the temporal distribution of gridded on-roa d motor vehicle emissions. Leonard Seitz has compiled AVC (count) data for the entire state for calendar year 2004. Factors are being developed to reapportion the daily truck volumes to new diurnal patterns based on the count data. Separate factors would be developed for the midweek days (Tuesday, Wednesday and Thursday combined) and individually for Friday, Sat urday, Sunday and Monday. Count data from June 1 through August 31, 2004 (excluding July 2-5) will be used to develop the factors. Factors were prepared for each Caltrans District. One or more counties may fall into a single

Caltrans District. All counties within each Caltra ns district will receive the same adjustment. These factors would be applied to the ITN before ru nning through DTIM. Since the count data (AVC) are sorted into FHwA vehicle class, a mapping is needed between FHwA and EMFAC

vehicle classes. The subcommittee has made the fol lowing approximation: 1) count data from

FHwA classes 7 and 8 would be used to distribute li ght heavy-duty trucks and medium heavyduty trucks and 2) count data from FHWA classes 9 t hrough 14 would be used to distribute heavy heavy-duty trucks.

Additionally, the subcommittee is developing a seco nd set of factors to scale the volumes of passenger cars and trucks for a Friday, Saturday, S unday and Monday compared to the average of Tuesday, Wednesday and Thursday (Tuesday , Wednesday and Thursday will remain unchanged).

Participants in the call made suggestions to improv e the methodology. ARB and district staffs thanked Leonard Seitz for his large contribution to and the ultimate success of this project.

Day-Specific Emissions ARB modeling staff mentioned that the day-specific shipping factors for the BAAQMD are being incorporated into the modeling inventories under de velopment.

4. Modeling Files and Reports ARB modeling staff plan to have model-ready files a vailable soon. ARB will notify the SIP GICG members when the files are ready. Modeling staff a lso described three summary reports that will be used to display the emission data.

 One report shows the original emission data as it comes in from CEFS. It then shows what emissions are deleted and replaced with day-specific data and the final emissions that continue on for processing into mode l-ready files. This report is sorted by air basin, pollutant, county and EIC3. E IC3 refers to the first three digits of

the EIC code and is often referred to as the summar y category. For example, under the major heading of Fuel Combustion, summary categ ories include Electric Utilities, Cogeneration and Petroleum Refining (Combustion).

 A second report shows the emission data after it h as been processed by EMS95. At this point in processing, emissions have be en assigned to a grid cell and distributed to hourly emissions from the daily amou nts, but before being speciated. This report is sorted by pollutant, EIC1 and county . Like the EIC3, the EIC1 refers to the first digit of the EIC code and is often referr ed to as the major heading. For example, under Stationary Sources, the EIC1 include s Fuel Combustion, Waste Disposal, Cleaning and Surface Coatings, Petroleum Production and Marketing, and

Industrial Processes.

### ___________________________________________________ ___________________ A-92  A third report provides domain totals by pollutant before speciation is applied followed by emission totals by speciated compound a fter speciation is applied in

EMS-95.

Once these reports are available for review, ARB mo deling staffs encouraged districts staff and others to review the data as well as make suggestio ns on ways to improve the reports or other reports that would be useful in reviewing the model ing inventories.

5. Other Issues

District staff asked about emissions for the state of Nevada. ARB has received the model-ready files from Gail Tonnesen (UC Riverside, CE-CERT) de veloped for the WRAP covering the State of Nevada. ARB staffs are not sure of exactly what sources are in the inventory (e.g. point, area, biogenics, motor vehicles?). ARB staff will investigate the question.

6. Plans for Next Meeting The next meeting is scheduled for April 27 at 10:00 am. 

## May 9, 2006

Attendees Affiliation

Phil Martien Bay Area AQMD Bruce Katayama, Hao Quinn Sacramento Metro AQMD Gary Arcemont, David Nunes San Joaquin Valley Unifi ed APCD Genie McGaugh Ventura County APCD Susan McLaughlin Yolo-Solano AQMD

Harold Brazil MTC Chris Emery Environ Vernon Hughes, Martin Johnson, Cheryl Taylor, Webst er Tasat ARB

1. Welcome and Introductions Cheryl welcomed everyone to the call. Introduction s were made. Introductions were made. ARB apologized for the confusion about the meeting. Just before the meeting was scheduled to start, a fire alarm occurred at the CalEPA headquar ters meeting for an unannounced building

evacuation drill. ARB staff left a voice mail mess age for one of the participants, who later heard the email, but not before several participants had dropped off the call. The meeting began at 10:45. Since there was a representative from each district who normally participates, the meeting was held.

2. Approval of April 6 Meeting Highlights

Due to a short turn-around time and confusion about the meeting, ARB staff asked participants to provide comments to ARB. If no comments are rec eived by the next meeting, the meeting highlights from April 6 will be considered approved as written.

3. Status of Gridded Inventories July/August 2000 Episode ARB inventory staffs are expecting to produce a new set of gridded CEFS outputs to provide to ARB modeling staffs by May 23. This new version wi ll replace the current version originally provided at the end of December 2005. Some updates to the inventory have occurred since December. Changes to point sources have mainly com e from the South Coast AQMD. Some changes to area sources have been made, including a n update to auto refinishing and a change to consumer products to correct an overestimation o f hair spray emissions. For off-road mobile

### ___________________________________________________ ___________________ A-93 sources, changes have been made to emissions from c argo handling equipment and locomotives. A major change to the categorization of emissions within CEIDARS from the OFFROAD model is occurring. Previously, data from the OFFROAD model were summed and reported to CEIDARS in 80 emissions categories. Be ginning with this next version, the emissions will be reported in 1,800 categories, ref lecting the level of detail that is carried in the OFFROAD model. This change will allow for more pre cise handling of the impacts of control measures in the inventory as well as more precise a ssignments of organic and PM speciation profiles. Changes are also expected in the emissio ns from on-road mobile sources. One change will be the handling of pending registration s in the calculation of vehicle population. Pending registrations are included in the registrat ion data from DMV and involve those vehicles that are in the process of being registered but for a variety of reasons cannot be registered (e.g. no smog certificate, fee not enclosed). In earlier versions of EMFAC, all of the pending registrations were included in the vehicle populati on. The assumption of including all pending registrations in the vehicle population has now bee n rethought. Factors have been calculated to reduce the vehicle population due to pending regist rations. Once all of the inventory revisions have been received by ARB modeling staff for the Ma y 23 submittal, any changes to the modeling inventories after that date will be handle d as external adjustments. The model-ready files and reports mentioned below reflect CEFS rf# 954. The new inventory provided May 23

would have a new reference number.

ARB inventory staffs are preparing an “8-Hour Ozone SIP” web site to allow viewing of the gridded inventories generated by CEFS. This web si te will also include report generators for the latest planning inventories. For on-road mobile so urces, the planning inventories will display

data from EMFAC2002 rather than the new version of EMFAC still in production. The web site

will mention that correction factors will be availa ble to district staffs to be applied to EMFAC2002 that can be used to approximate the new EMFAC. The web site will provide the phone number of ARB’s contact. At this point in time, the web s ite will only be available to district staffs. ARB inventory staffs will notify districts through the EITAC list serve when the web site is ready. Several district staffs asked if they could receive information on the web site since they aren’t on

the EITAC list. Names of interested SIP GICG membe rs will be given to ARB inventory staff for

inclusion on the announcement.

ARB modeling staff said that model-ready files and summary reports were posted to ARB’s Orthus ftp site on Monday, May 8. Contact Cheryl T aylor for more information on accessing the Orthus ftp site. Model-ready files were posted for point, area and mobile sources for July 27 through August 2, 2000. Biogenic files for July 29 through August 2, 2000 were also posted. July 27 and 28 are being developed for biogenics an d will be posted when available. The number of days for modeling this episode was increa sed to meet EPA’s requirement for RRF calculations (July 27 and 28 are being added.)

ARB modeling staff described the three types of rep orts that were posted:

 CEFS_RawData_Reports: This report shows the origi nal emission data as it

comes in from CEFS. It then shows what emissions a re deleted and replaced with day-specific data and the final emissions that cont inue on for processing into modelready files. This report contains emissions that a re sorted by air basin, pollutant, county and EIC3. EIC3 refers to the first three di gits of the EIC code and is often referred to as the summary category. For example, under the major heading of Fuel Combustion, summary categories include Electric Uti lities, Cogeneration and Petroleum Refining (Combustion).

### ___________________________________________________ ___________________ A-94  Speciation_Reports: The report provides domain to tals by pollutant before speciation is applied followed by emission totals b y speciated compound after speciation is applied in EMS-95.

 County_Total_Reports: This reports provides emiss ions (in kg/day) by county and pollutant. There are two identical columns of emissions; one may be ignored.

 District staffs were asked for suggested changes or improvements to these reports along with ideas for additional reports. Staffs on the call s uggested that reports with more detail, such as emissions sorted by EIC1 or EIC3, would be helpful. Also, reporting of ROG emissions as well as TOG would be helpful. District staff suggested a report that shows emissions for each facility by EIC3 would be useful. Clearer labeling of title s would also be helpful.

District staff reminded ARB that we had agreed to p rovide model-ready files and reports separately for light-duty and heavy-duty vehicles. In other words, the on-road mobile files and reports should be divided into two parts.

ARB staffs asked district staffs to review the repo rts and provide comments to ARB on Friday, May 19. ARB staffs will provide a summary of their observations by this Friday. District staff suggested that ARB staff write up these minutes in a timely manner since there was confusion about the time and occurrence of the meeting.

July 1999 Episode ARB staffs plan to have model-ready files and repor ts available for the July 1999 episode by

next week. A notification will be sent out when th ose files are available. The model-ready files and reports for the July 1999 episode will be recre ated with the next version of the inventory (expected May 23) as well as the July/August 2000 e pisode.

Future Years? District staffs were asked to contact their plannin g liaisons to let them know which future years would be of highest priority for modeling. Time an d resources are tight, so please discuss this

issue with them soon.

4. Other Issues

No other issues were discussed.

5. Plans for Next Meeting The next meeting is tentatively scheduled for eithe r May 30 or June 6 at 10:00 am. Which date is chosen will depend on comments received by the d istricts and the status of inventory preparation.