WESTAR Oil & Gas Conference October 2008 Mark Smith

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

Site Average 2008 YTD value Yellowstone Boulder Jonah South Daniel (red values indicate partial year data) Standard = 75 ppb 6

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

 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

 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

 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

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

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