1. 3SAQS Network Assessment Till Stoeckenius, ENVIRON Three-State Air Quality Working Group Conference Call 19 December 2013

2. Recent Work Refinement of ozone site database – Additional state and FLM input – Identify sites currently expected to be operating 2014 – 2017 – Identify reason for site closures (funding vs logistical or other siting concerns) – Identify seasonal Forest Service monitors – Identify sites with co-located NOx Identify all sites which can be included in 3SAQS – Currently operating and expected to continue operating – Potentially being closed primarily due to funding issues 2

3. Recent Work (cont.) Additional map layers – Ozone non-attainment areas – Oil & Gas basin boundaries and total emissions by basin – Producing wells 2008, 2011, 2011-2008 – RFD areas Correlation analysis Potentially underserved areas analysis 3

4. 4

5. 5 WestJump 2008 Emissions (tpy) BasinNOxVOCCOSOxPM D-J22,165100,62214,367115717 Piceance20,11345,71411,5205191,812 N. San Juan5,9172,1876,4563072 Uintah15,50897,30311,569431716 Powder River 20,98014,78715,445596666 Southwest WY23,82487,37416,0246,030679 Wind River1,33510,9932,0621,27631

6. 6

7. 7 Urban, Pop - Oriented Industrial Potential 3SAQS Ozone Monitoring Sites Other Co-Located NOx Seasonal Potential Closure Class I Area O&G NOx NOx (tpy)

8. 8 Potential or Confirmed Site Closure Wyoming Range Murphy Ridge Price Sunlight Mountain Kenosha Pass

9. 9 Potentially Underserved Area Thiessen Polygons

10. 10 Prevailing Summer Wind Direction

11. 11 NOx Point Source > 250 tpy RFD Area

12. 12 Predicted 4 th Highest Daily Max 8-hr O3: Apr-Aug 2008 (no fires; 8,000’ Mask) Predicted 4 th Highest Daily Max 8-hr O3: Apr-Aug 2008 (no fires)

13. 13 Predicted 4 th Highest Daily Max 8-hr O3: Apr-Aug 2008 (no fires; no BC/IC) Predicted 4 th Highest Daily Max 8-hr O3: Apr-Aug 2008 (no fires)

14. Inter-Site Correlations 14

15. 15

16. 16 #5 #4 #3 #2 #1 Ozone Monitor Clusters

17. 17 Colorado National Monument Palisade Water TreatmentGrand MesaGothicMcClure Pass Ajax Mountain (will close 2014)City of AspenSilt-Collbran Sunlight MountainWilsonFlattops #3Meeker, CORipple Creek ClusterSite / Elev. (m): 1740152130402926293034152415248532242358290419942930 5 Colorado National Monument 10.833460.764640.621270.704570.652410.653230.777560.740780.738980.736610.726180.6214 5 Palisade Water Treatment 0.8334610.762710.510070.772060.503550.615030.860280.606760.828570.776970.665450.74361 5 Grand Mesa 0.764640.762711#N/A0.840360.707320.549450.812460.794350.71140.782640.729090.81772 2 Gothic 0.621270.51007#N/A10.8127#N/A0.733740.761680.718410.68856#N/A0.66662#N/A 2 McClure Pass 0.704570.772060.840360.81271#N/A0.736190.816750.758880.780940.794880.70792#N/A 1 Ajax Mountain 0.652410.503550.70732#N/A 10.716840.622010.830820.69496#N/A0.63737#N/A 1 City of Aspen 0.653230.615030.549450.733740.736190.7168410.736280.654910.84122#N/A0.62741#N/A 3 Silt-Collbran 0.777560.860280.812460.761680.816750.622010.7362810.797910.873040.829110.82836#N/A 3 Sunlight Mountain 0.740780.606760.794350.718410.758880.830820.654910.7979110.761470.829420.688690.64728 3 Wilson 0.738980.828570.71140.688560.780940.694960.841220.873040.7614710.771220.800270.78353 4 Flattops #3 0.736610.776970.78264#N/A0.79488#N/A 0.829110.829420.7712210.785760.83205 4 Meeker, CO 0.726180.665450.729090.666620.707920.637370.627410.828360.688690.800270.7857610.7959 4 Ripple Creek 0.62140.743610.81772#N/A 0.647280.783530.832050.79591 Pearson Correlations in Departures from Running 30-Day Mean

18. Potential Altitude Effects on O3 – Reduced upwind depositional losses – Increased potential for stratospheric intrusion impacts – Reduced impacts from upwind sources located at lower elevations – Others? Recent Forest Service Study: – Highest nighttime O3 at highest elevations – No correlation of daytime O3 with elevation Relationships Between O3 and Altitude 18

19. Potentially Underserved Areas 19

20. Potentially Underserved Areas 20

21. Potentially Underserved Areas 21

22. Potentially Underserved Areas 22

23. Potentially Underserved Areas 23

24. Next Steps 24 StepDeadline Obtain additional input : NPS review of ozone site metadata6 January RFD shapefiles6 January Comments on potential underserved areas (locations, pros and cons) 6 January Prepare draft recommendations memo10 January Discuss recommendations with funding agencies and revise as appropriate Late January Document data sources and processing procedures31 January