1. Three-State Air Quality Study (3SAQS) Three-State Data Warehouse (3SDW) 3SAQS Revised 2011 Modeling Protocol Reflecting Reviewer Comments University of North Carolina (UNC-IE) Cooperative Institute for Research in the Atmosphere (CIRA) ENVIRON International Corporation (ENVIRON) July 28, 2014

2. 2 Four set of Comments provided on the draft 3SAQS 2011 Modeling Protocol (April 2014) Responders: – U.S. EPA Region 8 Gail Tonnesen, Rebecca Matichuk and Robin Coursen – Mike Barna, NPS – Tammy Thomson, CSU/NPS – Brian Bohlmann, Wyoming DEQ Responses discussed on June 19, 2008 Conference Call Response-to-Comments document dated July 22, 2014 Revised Draft 2011 Modeling Protocol (July 2014)

3. Revised 3SAQS Draft 2011Modeling Protocol Main updates were: – Add description of 3SAQS 2015 Work – More details on MPE – Explanations Snow cover albedo MOZART vs. GEOS-Chem MEGAN vs. BEIS PMDETAIL vs. SMARTFIRE – Clarifications – Typos – Remove citations from footnotes

4. 4 Changes in Revised 2011 Modeling Protocol 1.0 Introduction – Numerous language changes – Make clearer that 2011 platform not just for O&G – New Section 1.5.2 and Table 1.2 State Rulemakings that affect O&G Emissions 2.0 Model Selection – Made clear that CMAQ is being applied and part of MPE and FY modeling (3SAQS 2015 SOW) 3.0 Episode Selection (None) 4

5. 5 Changes in Revised 2011 Modeling Protocol 4.0 Domain Selection – Added 4 km plot  5.0 WRF Modeling – Winter O3 in 2015 SOW

6. 6 Changes in Revised 2011 Modeling Protocol 6.0 Emissions – Added justification for: MEGAN vs. BEIS (Biogenics) PMDETAIL vs. SMARTFIRE (Fires) – Questions on SMOKE processing streams and requests for separating specific source categories Updated Table 6-1 and text to be clearer which source categories are being processed separately Response-to-Comments responses to request for each source category

7. 7 Changes in Revised 2011 Modeling Protocol 6.0 Emissions – Clarified Figure 6-1 3SAQS 4 km Domain

8. 8 Changes in Revised 2011 Modeling Protocol 6.0 Emissions – Separated discussion of development of 2011 and 2020 O&G emissions like was done for other source categories – Clarified 2020 O&G projection assumptions: State-provided – activity growth/decline and no controls analysis Survey-based – activity growth/decline and controls analysis including no turnover assumption when decline

9. 9 Changes in Revised 2011 Modeling Protocol 7.0 Photochemical Modeling – Will configure CAMx/CMAQ and WRF for winter ozone event modeling in 3SAQS 2015 SOW Will include use of high snow cover albedo instead of average value that is used for regional modeling – Included new Table 7-2 listing CMAQ model configuration

10. 10 Changes in Revised 2011 Modeling Protocol 8.0 Model Performance Evaluation – Ozone performance metrics use 60 ppb threshold – Commit to evaluation for O3/PM precursors No change, already in Protocol – Evaluation against NH3 measurements Added description of AMON network and commit to use data in evaluation

11. 11 Changes in Revised 2011 Modeling Protocol 8.0 Model Performance Evaluation – Vertical Ozone Comparisons Protocol already mentions evaluation against ~50 ozonesonde released at Boulder, CO in 2011 Researching questions regarding 2011 UGEWOS ozone soundings – Snow Cover and Albedo Will address in 3SAQS 2015 SOW when analyzing winter ozone events – Precipitation and Cloud Cover Evaluation of WRF for monthly PRISM precipitation completed – Questions regarding reliability of PRISM for summer convection – Future plans for use of daily PRISM data analysis fields Will examine cloud cover for winter ozone events

12. 12 Changes in Revised 2011 Modeling Protocol 8.0 Model Performance Evaluation – Diagnostic Model Outputs Diagnostic sensitivity tests addressed in 3SAQS 2015 SOW with input from 3SAQS Technical Committee – Will include BC sensitivity if alternative BCM output available