1. Template Update on Progress of FY12-13 Work Plan Activities Presentation to the NETAC Policy and Technical Committees Sue Kemball-Cook and Greg Yarwood June 13, 2013 skemballcook@environcorp.com

2. Haynesville Shale Mobile Source Emission Inventory Heavy-duty diesel trucks transporting water and materials to and from Haynesville well sites may be an important source of NOx emissions –Not included in NETAC’s Haynesville emission inventories Trips can occur on rural public roads and on private roads –Trips may not be fully accounted for in current on-road mobile source emission inventories Study aims to characterize the magnitude of these emissions by developing a new Haynesville Shale mobile source inventory –Is this a significant source of emissions? 2

3. Method and Status 2012 emission inventory year Survey developed, approved by NETAC Technical Committee, and sent to 14 producers in April, 2013 –Email/phone followup –1 survey has been returned Now reviewing other studies to provide additional information on truck traffic associated with natural gas production Develop emission inventory –Assess significance of on-road mobile in relation to other Haynesville sources Incorporate inventory into NETAC’s ozone modeling 3

4. Control Strategy Evaluation Develop a list of potential emissions control measures to be evaluated with NETAC’s ozone models To be creditable in a SIP, emissions reductions must be: –Permanent –Federally enforceable –Surplus –Quantifiable Voluntary local measures that do not meet these criteria can be considered Request that operators of large EGU/industrial sources contribute description of potential emission controls for their facilities Ozone Advance Path Forward Document 4

5. Ozone Modeling Reduce high bias in modeled ozone –More accurate simulation of transported versus local contribution –Sensitivity tests –AQRP project Re-run episodes using source apportionment to confirm relative importance of source regions and emission source categories Use modeling and emissions study results to develop control strategy evaluation report that can inform NETAC’s Ozone Advance Path Forward Letter –CAMx runs to guide control strategy development  What is the effect of reducing emissions from a particular emissions category on Northeast Texas ozone? Final report 5

6. Other Tasks Conceptual model update through the 2012 ozone season –Analysis underway, report completed by fall 2013 Review of TCEQ point, area, off-road emission inventories for 2008 –Analysis completed, report in progress 6