1. WESTAR Oil & Gas Conference October 2008 Mark Smith

5.  PM-10 and NOx are within NAAQS ◦ NOx increment analysis completed  PM2.5 sometimes impacted by fire  OZONE……. Increment Consumed Maximum PSD Allowance Class II11.525 Class I0.142.5

6. Site2005200620072005- 2007 Average 2008 YTD value Yellowstone0.0600.0690.065 0.061 Boulder0.0790.0720.0670.0720.101 Jonah0.0750.0690.0680.0700.082 South Daniel 0.0660.0740.0660.074 (red values indicate partial year data) Standard = 75 ppb 6

8.  New (1-3 years) monitors in Atlantic Rim and Wamsutter ◦ No issues yet (PM, ozone, NOx)  Monitor budgeted for Hiawatha area (planned new development)

10.  Monitors in place include PM (2.5 and 10), NOx, and ozone  Upwind and downwind of CBM and coal mining activities  Wind-related PM-10 excursions occur ◦ Usually covered by coal mine NEAP  PM2.5 well within standard  NOx is staying within standard  Ozone has been somewhat elevated ◦ Within NAAQS but we are watching

12.  Facilities in Powder River Basin (PRB) increasing in number and moving west  Existing facilities are being modified for significant expansion ◦ Minor source to major source ◦ Major source to approaching PSD threshold ◦ Expected that more sources will be major sources of HAPs

13.  Current production is primarily in the PRB (northeast portion of the state)  Future development in other areas of WY would have a significant impact especially in those areas are already concentrated with oil & gas facilities

14. Source: http://www.wsgs.uwyo.edu/coalbed/

15.  As with CBM, oil shale deposits are located in areas already experiencing concentrated oil & gas development activities

16. Source: http://fossil.energy.gov/programs/reserves/publications/Pubs-NPR/40010-373.pdf