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Nonroad Mobile Workgroup

Collaborative Wiki Main Page

Inventory Collaborative Google Drive Link

Members

Co-leads: Sarah Roberts (EPA OTAQ), Rebecca Simpson (Colorado Department of Public Health and Environment)

Alexandra Catena (District of Columbia), Alison Eyth (EPA OAQPS), Andy Bollman (North Carolina), Brian Sullins (Alabama), Brian Timin (EPA OAQPS), Brian Trowbridge (Pennsylvania), Chris Bovee (Wisconsin), Chris Kite (Texas), Chris Rochester (New York), Collin Smythe (Vermont), Dale Wells (Colorado), Gil Grodzinsky (Georgia), James Smith (Tennessee), Jim Koroniades (New Jersey), Ken Santlal (Massachusetts), Marc Bennett (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Peter Verschoor (Utah), Sonya Lewis-Cheatham (Virginia), Susanne Cotty (Pima County, AZ), Sylvia Vanderspek (California), Tim Wallace (Maryland), Tom Moore (WESTAR), Vanessa Crandell-Beck (Alaska)

Work Group Meetings

June 28, 2018

Attendees

Co-leads: Sarah Roberts (EPA OTAQ), Rebecca Simpson (Colorado Department of Public Health and Environment)

Alexandra Catena (District of Columbia), Alison Eyth (EPA OAQPS), Andy Bollman (North Carolina), Brian Sullins (Alabama), Brian Timin (EPA OAQPS), Brian Trowbridge (Pennsylvania), Chris Bovee (Wisconsin), Chris Kite (Texas), Chris Rochester (New York), Collin Smythe (Vermont), Dale Wells (Colorado), Gil Grodzinsky (Georgia), James Smith (Tennessee), Jim Koroniades (New Jersey), Ken Santlal (Massachusetts), Marc Bennett (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Peter Verschoor (Utah), Sonya Lewis-Cheatham (Virginia), Susanne Cotty (Pima County, AZ), Sylvia Vanderspek (California), Tim Wallace (Maryland), Tom Moore (WESTAR), Vanessa Crandell-Beck (Alaska)

Agenda

  • New work group co-chair!
  • EPA Update: MOVES2014b
  • Running MOVES2014b for beta inventory: model defaults vs. incorporating 2014 submittals
  • Updating Nonroad model inputs for the 2016 inventory
  • Other business

Minutes/Notes

  • Meeting slides

May 24, 2018

Attendees

Co-leads: Sarah Roberts (EPA OTAQ) and TBD

Alison Eyth (EPA OAQPS), Andy Bollman (North Carolina), Brian Timin (EPA OAQPS), Chris Bovee (Wisconsin), Chris Kite (Texas), Collin Smythe (Vermont), Dale Wells (Colorado), Gil Grodzinsky (Georgia), Ken Santlal (Massachusetts), Kevin Briggs (Colorado), Marc Bennett (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Rebecca Simpson (Colorado), Sonya Lewis-Cheatham (Virginia), Susanne Cotty (Pima County, AZ), Tim Wallace (Maryland)

Agenda

  • EPA Update: MOVES2014b
  • Proposal to aggregate Nonroad SCCs for reporting nonroad emissions
  • Updating Nonroad model inputs for the 2016 inventory
    • Available resources from the work group
    • Targeting equipment sectors and model inputs
    • Data sources
  • Other Business
    • Preparing for beta version
    • Call for volunteers to serve as work group co-chair
    • Questions and discussion

Minutes/Notes

EPA update (MOVES2014b): Sarah reiterated that EPA will be showing the results of their MOVES2014a vs MOVES2014b comparisons at the next MOVES Review Work Group meeting, on June 13th. Andy Bollman asked if EPA would make state-level comparison results available for review. Sarah responded that EPA currently has comparison results at the national level and for four select counties, but will speak with the MOVES team about spinning up state-level results.

Proposal to aggregate nonroad SCCs: Sarah walked through an EPA proposal to aggregate nonroad SCCs by fuel type and equipment sector, in an effort to get the nonroad emissions file (currently at 1.0 - 1.6 GB compressed) to a more manageable size. EPA is seeking to understand if users need the more detailed emissions that are currently available, or if aggregated emissions would suffice. Brian Timin stated that he uses detailed information to better pin-point emissions. Alison Eyth clarified that EPA would continue to produce output at the detailed SCC level (and those results would still be available), but that the more aggregated form would be put into SMOKE. Work group members are asked to review the proposal (see hyperlink above) and provide any feedback to Sarah.

Updating model inputs for 2016 inventory: workgroup members expressed a clear interest in developing updated inputs for the 2016 inventory. On a scale of 1 to 5 (1 = no interest; 5 = high interest), over 90% of those in attendance indicated a high level of interest (4-5 on the scale) in developing inputs. Furthermore, workgroup members indicated that they or their organizations would be willing to commit resources to the effort, on the order of 1-8 hours per week (average = 2.9 hours per week). For the most part, workgroup members felt that they would be able to best contribute to the effort by QAing results/data and developing documentation. There was also some interest in compiling data and sources. With respect to which model inputs the workgroup should focus its efforts, equipment populations and state-to-county allocations generated the most interest. Dale Wells pointed out that with respect to surrogate data for allocating state-level equipment populations, there could be some overlap with the NEI nonpoint sector, particularly in the agriculture and construction sectors. The equipment sectors which garnered the most interest were construction, agriculture, lawn & garden, and recreational. Some workgroup members indicated an awareness of or familiarity ofwith some available data sources such as pleasure craft and recreational (ATVs, snowmobiles) registrations and some surveys in the lawn & garden and construction sectors (in addition to LADCO's work in the agriculture sector). Mark Janssen suggested an approach of focusing discussion on the highest-emitting categories and talk through as a group how we want to tackle data improvements. This approach will form the basis of the discussion for the June 28th call, which the group broadly agreed should run for 90 minutes instead of one hour.

Action Items

  • All: if you're planning to submit data for inclusion in the beta inventory, please contact Sarah Roberts and Alison Eyth to indicate what inputs you intend to provide
  • All: review proposal to aggregate nonroad SCCs and provide feedback to Sarah
  • Sarah: check with MOVES team about providing state-level MOVES2014a vs. MOVES2014b comparisons
  • Sarah: send updated meeting notice for extended meeting on June 28th.

April 26, 2018

Attendees

Co-leads: Sarah Roberts (EPA OTAQ), Joseph Jakuta (Ozone Transport Commission)

Alison Eyth (EPA OAQPS), Andy Bollman (North Carolina), Chris Bovee (Wisconsin), Chris Kite (Texas), Chris Rochester (New York), Collin Smythe (Vermont), Dale Wells (Colorado), Gil Grodzinsky (Georgia), James Smith (Tennessee), Ken Santlal (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Rebecca Simpson (Colorado), Sonya Lewis-Cheatham (Virginia), Tim Wallace (Maryland)

Agenda

Minutes/Notes

EPA still targeting a summer release of MOVES2014b, with the goal of using the updated model for the 2016 beta inventory in late summer 2018. EPA will present results of their MOVES2014b testing, including nonroad inventory comparisons with MOVES2014a, at the June 13th meeting of the MOVES Review Work Group (to be added to the MOVES Review Work Group distribution list, please email Sarah). Draft MOVES2014b nonroad technical reports and related peer-review materials are posted on EPA’s Science Inventory page (search “MOVES201X”).

Reminder that the 2016 alpha release, along with 2014 and 2015 platform materials are available for download from EPA’s FTP site.

Chris Kite (Texas Commission on Environmental Quality) gave a presentation on TexN, the ERG-developed tool that TCEQ uses to facilitate the inclusion of regional updates (e.g., activity, population data collected in specific counties) to estimate nonroad emissions for Texas. This integrated calculation and data management system drastically reduces the effort associated with NONROAD file preparation, model execution, and output file aggregation. The tool automates the running of NONROAD for all 254 Texas counties (a single run usually completes within 24 hours) and contains 25 distinct sub-sectors with distinct equipment population and activity profiles (diesel construction equipment comprises most of these sub-sectors; miscellaneous equipment less than 25 hp and all non-diesel construction equipment uses EPA’s NONROAD defaults). Chris reviewed TexN output in a series of plots that highlighted trends in equipment populations and emissions by Texas geographic area, fuel/engine type, and certification standard.

In addition, Chris identified some questions for the work group to consider for 2016 modeling platform needs:

1. Are monthly nonroad inventory runs required or are season runs acceptable? The temporal allocation of nonroad activity is uniform for months within the same season.

2. For each season/month modeled, are day type inventories needed for both weekend and weekday? TCEQ develops weekday inventories only, and then applies separate temporal profiles during emissions processing to obtain weekend inventories.

Mark Janssen (LADCO) asked about TexN handling of age distributions and scrappage curves. Except for skid-steer loaders, NONROAD’s scrappage curves were maintained.

Subsequent discussion centered around the need to transition the work group’s efforts to improving estimates from select equipment categories (e.g., expanding LADCO’s work utilizing agricultural data to refine activity profiles). The work group call on May 24 will be dedicated primarily to coming up with a plan for how we might apply some “lessons learned” from state/local work to this national inventory. We’ll focus on defining the target equipment sector (e.g., construction, agriculture) and 2016 input data (e.g., activity, population, allocation), identifying data sources (direct and/or surrogate), and determining level of effort and available resources.

Reminder that States and Locals are invited to provide data they’d like to have incorporated into the 2016 beta inventory. Data can be provided in spreadsheets and supplied to Sarah Roberts and Alison Eyth.

Joseph Jakuta will soon be leaving his position at OTC, and unfortunately must step down as the co-chair of this work group. The work group thanks Joseph for his contributions to the work group, and hopes he can find a way to continue to participate in the effort. Work group members who are interested in volunteering to serve as the next co-chair should contact Sarah.

Action Items

  • All: If you'd like to volunteer to serve as the workgroup's co-chair, please contact Sarah
  • All: if you're planning to submit data for inclusion in the beta inventory, please contact Sarah Roberts and Alison Eyth to indicate what inputs you intend to provide
  • All: if you would like to present on local efforts to improve nonroad emissions estimates, please let Sarah know by COB May18th

Next call: Thursday, May 24 3:30pm EDT

March 22, 2018

Attendees

Co-leads: Sarah Roberts (EPA OTAQ), Joseph Jakuta (Ozone Transport Commission)

Alison Eyth (EPA OAQPS), Andy Bollman (North Carolina), Brian Sullins (Alabama), Chris Bovee (Wisconsin), Chris Kite (Texas), Chris Rochester (New York), Dale Wells (Colorado), Gil Grodzinsky (Georgia), James Smith (Tennessee), Ken Santlal (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Peter Verschoor (Utah), Rebecca Simpson (Colorado), Sonya Lewis-Cheatham (Virginia), Susanne Cotty (Pima County, AZ), Tim Wallace (Maryland)

Agenda

Minutes/Notes

EPA is targeting a summer release of MOVES2016b for use in 2016v1 (and perhaps the beta version), with a primary focus on improving nonroad inventories. The improvements involve recalculations of engine populations from refining the engine population growth rates, a bug fix in the nonroad fuel supply, and improvements in Tier 4 and after-treatment data. These are primarily database updates, but some minor code changes were necessary. MOVES2016b will not be considered a new model for SIP and conformity purposes. The release will also resolve an issue involving scratch files that creates problems when running virus scan. The new growth rates are comparable to what was submitted by a handful of states as part of the recent NODA process. EPA will share results of MOVES2014b testing with the workgroup as they become available.

2016 alpha release is now available for download from EPA’s FTP site. Joseph reviewed a summary of NOx, PM2.5 and SO2. Agriculture is the largest category and has the most regional variation. Construction equipment is the next more important category. Pleasure craft, commercial, industrial and lawn and garden are around the same magnitude as the third most important.

Mark Janssen reviewed slides on some of LADCO’s efforts to rethink NONROAD. Focused on “following the money” to determine the best source for population and activity data. Agricultural equipment was a prime category, and Department of Agriculture data estimating the amount of fuel required for agricultural operations was used as a starting point. LADCO generated a new monthly activity profile with spring and fall peaks (corresponding to planting and harvesting activities), in contrast to EPA’s default monthly activity levels that show a peak during the summer ozone season. Another area of concern is the spatial allocation problem shown by fitting data into counties and the distribution of pleasure craft in the Great Lakes.

Andy Bollman (North Carolina) reviewed slides on efforts to improve growth of agriculture and construction equipment. Began by looking at 2011 nonroad NOx emissions and finding the levels high. Developed surrogate data using sales data from EIA. Construction equipment sales decreased and agriculture equipment decreased then increased. Used new values for years up to 2015 and let NONROAD calculate growth thereafter. Construction equipment in particular varied considerably from NONROAD. Did only look at the years in the model rather than every year which may have resulted in spikes or extreme dips being glossed over.

Dale Wells (Colorado) asked if for the NEI, there were any efforts to harmonize fugitive dust emissions with nonroad activity. Alison Eyth indicated that she was not aware of such efforts, but that that might be worth digging into. Gil Grodzinsky (Georgia) reviewed his work in which he ran 15 counties in GA looking at the impact of updating growth indices on emissions, compared to EPA defaults and a no-growth scenario. Overall NOx reductions occur with no-growth and the updated surrogate, but VOCs only changed for the no growth scenario. A review was conducted of various sectors.

Mark also showed LADCO data illustrating the growth of snowmobiles may be overestimated as well. Peter Verschoor (Utah) also commented that snowmobile populations are declining in Utah. Sarah concurred that NONROAD’s current growth rates for the recreational equipment sector appear to overestimate populations, and that the updated growth rates in MOVES2014b will bring that curve down substantially.

Action Items

  • All: review draft workgroup charge; provide comments to Sarah and Joseph by April 1st, 2018
  • All: if you're planning to submit data for inclusion in the beta inventory run, please contact Sarah, Joseph, and Alison Eyth to indicate what inputs you intend to provide
  • All: if you would like to present on efforts to improve emissions estimates from the Lawn & Garden and Recreational Marine sectors at the April 26th workgroup meeting, please send a note to Sarah and Joseph by COB Monday, April 23rd

Next call: Thursday, April 26 3:30pm EDT

February 8, 2018

Attendees

Co-leads: Sarah Roberts (EPA OTAQ), Joseph Jakuta (Ozone Transport Commission)

Alexandra Catena (District of Columbia), Alison Eyth (EPA OAQPS), Brian Sullins (Alabama), Brian Timin (EPA OAQPS), Brian Trowbridge (Pennsylvania), Chris Bovee (Wisconsin), Chris Kite (Texas), Chris Rochester (New York), Dale Wells (Colorado), Gil Grodzinsky (Georgia), James Smith (Tennessee), Ken Santlal (Massachusetts), Kusandra King (North Carolina), Marc Bennett (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Rebecca Simpson (Colorado), Sonya Lewis-Cheatham (Virginia), Stephanie Huber (California), Susanne Cotty (Pima County, AZ), Vanessa Crandell-Beck (Alaska)

Agenda

  • Welcome and Introductions
  • Overview of Inventory Collaborative
    • Organizational Structure
    • Platform Schedule
    • Resources
  • Nonroad Work Group Tasks
  • Planned Updates to NONROAD Model
  • Next Steps

Minutes/Notes

EPA heard from states that they wanted to be more involved in providing inputs in development of inventories, as well as the methods used, in particular when projecting growth. Inventory will be in 3 phases. Alpha will be based on 2014 NEI v2, which has been posted on the ftp site. The nonroad files are rather large and might need to be resized. Beta will include projections to 2023 and 2028 and improvements to 2014. 2016v1 will be completed by winter 2019.

NONROAD standalone model was release about 20 years ago and besides folding it into the MOVES GUI and updating a few emissions rates there have been no improvements. EPA is planning on updating the growth rates that are growing populations or activity from 1996, 1998, or 2000 depending on class in the next update to MOVES. It currently uses a national growth rate, which is based on a linear extrapolation. Planning on using a variety of mostly public data sets including projection surrogates such as US Census population as well as historic data such as fuel and kerosene sales and boat registrations. This new data saw an overall decrease in engine populations in most sectors and reductions in emissions as well. For this effort EPA is considering whether they will provide an updated NONROAD input database or develop adjustment factors to apply after MOVES2014a NONROAD runs are complete.

Gil Grodzinsky conducted a similar test of improving growth rates for some sectors and found similar results for the sectors they analyzed.

It should be noted that aircraft ground support equipment and oil and gas equipment from NONROAD is not used and will not fall under the purview of this group.

Mark Janssen brought up the issue of whether some of this work could be taken outside of the NONROAD model and would like to block off time to hear from others on what they have done in individual states.

In subsequent calls we would like to plan on having members of the workgroup present some of their findings and methodology. Sarah Roberts proposed looking at sectors in order of emissions importance. We will start with agriculture and construction next month.

Datasets should be sent to Sarah Roberts (Roberts.Sarah at epa.gov) and Alison Eyth (Eyth.Alison at epa.gov) at EPA as well as Joseph Jakuta at OTC (jjakuta at otcair.org)

Action Items

  • If you would like to receive information and you are not on the distribution list please contact Sarah Roberts.
  • Everyone should look at the 2016 nonroad inventory and the NEI documentation to understand how base year data is developed.
  • We need to identify areas where data can be improved, populations or activity, including state data, and whether we should target particular sectors.
  • Everyone should become familiar with the updates EPA plans on making to NONROAD in MOVES.
  • Joseph Jakuta and Sarah Roberts will work on a workgroup charge prior to the next call; will circulate to the group
  • Sarah Roberts will send out an email to inform everyone of the next meeting and the sectors to focus on (agriculture and construction).
  • If you would like to share work that’s been done at the local, state, and regional level to improve emissions estimates from the Construction and Agriculture nonroad equipment sectors, please send a note to Sarah and Joseph by COB Monday, March 19th.
  • If anyone has any preferences for dividing the nonroad inventory into smaller sizes for review send them to Sarah and Joseph.

Next Call: Thursday, March 22 3:30 pm EDT